Markarian 501

Observation Date (UT)	Observation Lat
	ARGO-YBJ (30.11) ASTRI Mini-Array (28.3) CANGAROO (-31.10 ) CAT (42.50) Crimea (45) CTA pSCT (31.68) CTA South (-24.6272) Durham (-30.48) FACT (28.76) H.E.S.S. (-23.16) HAGAR (30) HAWC (19.0) HEGRA (28.76) LHAASO (29.358) LST-1 (28.76) MAGIC (28.76) Milagro (35.88 ) Potchefstroom (-26.9) TACTIC (24.6) TAIGA (103.07) Telescope Array (39.3) Tibet (30.11) VERITAS (31.68) Whipple (31.68)

Canonical Name:	Markarian 501
TeVCat Name:	TeV J1653+397
Other Names:	4C +39.49 B3 1652+398 RGB J1653+397 H 1652+398 1ES 1652+398 3FGL J1653.9+3945 2HWC J1653+397
Source Type:	HBL
R.A.:	16 53 52.2 (hh mm ss)
Dec.:	+39 45 37 (dd mm ss)
Gal Long:	63.60 (deg)
Gal Lat:	38.86 (deg)
Distance:	z=0.034
Flux:	(Crab Units)
Energy Threshold:	300 GeV
Spectral Index:	2.72
Extended:	No
Discovery Date:	1996-01
Discovered By:	Whipple
TeVCat SubCat:	Default Catalog

Source Notes:

Source position and its uncertainty:
- no information available
- the source position provided by NED is used

The flux from Markarian 501 has been found to be variable

Spectral Index:
The spectrum of Mrk501 has found to be variable
From Acciari et al. (2010):
- VERITAS index: 2.72 +/- 0.15(stat) +/- 0.10(syst)
- MAGIC index: 2.67 +/- 0.21(stat) +/- 0.20(syst)
- These data were taken during a quiescent state


Seen by: Whipple, HEGRA, CAT, MAGIC, Telescope Array, Crimea, Durham, TACTIC, FACT, ARGO-YBJ, VERITAS, HAWC, LHAASO

• Insights into the broad-band emission of the TeV blazar Mrk 501 during the first X-ray polarization measurements
  Abe, S. et al., arXiv e-prints parXiv:2401.08560 (2024) [LINK]
  
• Polarization and Multiwavelength Observations of Mrk 501 Reveal Polarization Variability across Different Energies and Fluxes
  Hu, Xin-Ke et al., arXiv e-prints parXiv:2402.11949 (2024) [LINK]
  
• Broadband Multiwavelength Study of LHAASO-detected Active Galactic Nuclei
  Wang, Ze-Rui et al., ApJS 271 p10 (2024) [LINK]
  
• Estimating the jet power from Broadband SED modelling of Mkn 501 for different particle distributions
  Bora, Hritwik et al., MNRAS 529 p4433-4441 (2024) [LINK]
  
• Polarized Blazar X-rays imply particle acceleration in shocks
  Liodakis, Ioannis et al., arXiv e-prints parXiv:2209.06227 (2022) [LINK]
  
• X-ray Intraday Variability of HBL Blazars with XMM-Newton
  Devanand, P.U. et al., arXiv e-prints parXiv:2209.05515 (2022) [LINK]
  
• Multi-messenger characterization of Mrk 501 during historically low X-ray and gamma-ray activity
  Abe, H. et al., arXiv e-prints parXiv:2210.02547 (2022) [LINK]
  
• Probing the Extragalactic Mid-infrared Background with HAWC
  Albert, A. et al., ApJ 933 p223 (2022) [LINK]
  
• Hadronuclear interactions in the jet of low TeV luminosity AGN: Implications for the low-state very-high-energy gamma-ray emission
  Xue, Rui et al., arXiv e-prints parXiv:2210.09797 (2022) [LINK]
  
• Multiwavelength periodicity search in a sample of gamma-ray bright blazars
  Otero-Santos, J. et al., arXiv e-prints parXiv:2210.16327 (2022) [LINK]
  
• Long-term multiwavelength periodicity on the light curves of Mrk 501: the case for an eclipsing supermassive binary black hole
  Magallanes-Guijón, G. and Mendoza, S., arXiv e-prints parXiv:2210.15884 (2022) [LINK]
  
• Probing micro-eV ALPs with future LHAASO observation of AGN gamma-ray spectra
  Long, Guangbo et al., arXiv e-prints parXiv:2101.10270 (2021) [LINK]
  
• Kinetic powers of the relativistic jets in Mrk 421 and Mrk 501
  Deng, Xiao-Chun et al., MNRAS 504 p878-887 (2021) [LINK]
  
• Long-term spectra of the blazars Mrk 421 and Mrk 501 at TeV energies seen by HAWC
  Albert, A. et al., arXiv e-prints parXiv:2106.03946 (2021) [LINK]
  
• Relentless multi-wavelength variability of Mrk 421 and Mrk 501
  Sliusar, Vitalii et al., arXiv e-prints parXiv:2108.08130 (2021) [LINK]
  
• On the narrow spectral feature at ~3 TeV in the MAGIC spectrum of Mrk 501
  Hu, Wen and Yan, DaHai, arXiv e-prints parXiv:2108.10468 (2021) [LINK]
  
• X-ray spectra, light-curves and SEDs of blazars frequently observed by Swift
  Giommi, Paolo et al., MNRAS p (2021) [LINK]
  
• Long-term multi-band photometric monitoring of Mrk 501
  Arbet-Engels, Axel et al., arXiv e-prints parXiv:2109.03205 (2021) [LINK]
  
• Detectability of large correlation length inflationary magnetic field with Cherenkov telescopes
  Korochkin, Alexander et al., arXiv e-prints parXiv:2111.10311 (2021) [LINK]
  
• Radio-gamma-ray response in blazars as signature of adiabatic blob expansion
  Tramacere, Andrea et al., arXiv e-prints parXiv:2112.03941 (2021) [LINK]
  
• X-ray timing and spectral variability properties of blazars S5 0716+714, OJ 287, Mrk 501, and RBS 2070
  Mohorian, Maksym et al., MNRAS p (2021) [LINK]
  
• Study of the variable broadband emission of Markarian 501 during the most extreme Swift X-ray activity
  MAGIC Collaboration et al., arXiv e-prints parXiv:2001.07729 (2020) [LINK]
  
• Progress in unveiling extreme particle acceleration in persistent astrophysical jets
  Biteau, Jonathan et al., arXiv e-prints parXiv:2001.09222 (2020) [LINK]
  
• NuSTAR View of TeV Blazar Mrk 501
  Pandey, Ashwani, Galaxies 8 p55 (2020) [LINK]
  
• Relevance of Jet Magnetic Field Structure for Blazar ALP Searches
  Davies, James et al., arXiv e-prints parXiv:2011.08123 (2020) [LINK]
  
• A Two-zone Photohadronic Scenario for EHBL-like Behavior of Mrk 501
  Sahu, Sarira et al., ApJ 901 p132 (2020) [LINK]
  
• Electron-beam interaction with emission-line clouds in blazars
  Wendel, Christoph et al., arXiv e-prints parXiv:2012.05215 (2020) [LINK]
  
• Studies of extragalactic background light with TeV BL Lacertae objects
  Longhua, Qin et al., MNRAS 499 p2662-2671 (2020) [LINK]
  
• The 2014 TeV Gamma-Ray Flare of Mrk 501 Seen with H.E.S.S.: Temporal and Spectral Constraints on Lorentz Invariance Violation
  Abdalla, H. et al., ApJ 870 p93 (2019) [LINK]
  
• Extremely High energy peaked BL Lac nature of the TeV blazar Mrk 501
  Singh, K K et al., arXiv e-prints parXiv:1906.04486 (2019) [LINK]
  
• Multi-TeV flaring in nearby High Energy Blazars: A photohadronic scenario
  Sahu, Sarira, arXiv e-prints parXiv:1907.01174 (2019) [LINK]
  
• On the TeV gamma-ray and X-ray correlations exhibited in high-energy peaked BL Lacs: Mrk 501 and 1ES 1959+650
  Osorio, Mabel et al., arXiv e-prints parXiv:1909.00897 (2019) [LINK]
  
• Spectral analysis of the blazars Markarian 421 and Markarian 501 with the HAWC Gamma-Ray Observatory
  Coutino de Leon, S. et al., 36th International Cosmic Ray Conference (ICRC2019) 36 p654 (2019) [LINK]
  
• The VHE SED modelling of Markarian 501 in 2009
  Sahu, Sarira et al., arXiv e-prints parXiv:1909.11818 (2019) [LINK]
  
• Study of periodic signals from blazars
  Bhatta, Gopal, arXiv e-prints parXiv:1909.10268 (2019) [LINK]
  
• Multiwavelength Variability Signatures of Relativistic Shocks in Blazar Jets
  Boettcher, Markus and Baring, Matthew G, arXiv e-prints parXiv:1911.02834 (2019) [LINK]
  
• ANTARES search for high-energy neutrinos from TeV-emitting blazars, Markarian 421 and 501, in coincidence with HAWC gamma-ray flares
  Organokov, Mukharbek and Pradier, Thierry, arXiv e-prints parXiv:1911.04963 (2019) [LINK]
  
• Modeling spectral lags in active galactic nucleus flares in the context of Lorentz invariance violation searches
  Cedric, Perennes et al., arXiv e-prints parXiv:1911.10377 (2019) [LINK]
  
• Fundamental physics with blazar spectra: a critical appraisal
  Galanti, Giorgio et al., arXiv e-prints parXiv:1911.09056 (2019) [LINK]
  
• Study of long-term flux and photon Index distributions of blazars using RXTE observations
  Khatoon, Rukaiya et al., arXiv e-prints parXiv:1910.14352 (2019) [LINK]
  
• A survey of Active Galaxies with the HAWC Gamma-ray Observatory
  Carraminana, Alberto et al., arXiv e-prints parXiv:1908.06831 (2019) [LINK]
  
• Verification of the diffusive shock acceleration in Mrk 501
  Zheng, Y.G. et al., ArXiv e-prints p (2018) [LINK]
  
• X-ray spectral variability of blazars using principal component analysis
  Gallant, D. et al., ArXiv e-prints p (2018) [LINK]
  
• The Polarization Behavior of Relativistic Synchrotron Jets
  Peirson, A.L. and Romani, R.W., ArXiv e-prints p (2018) [LINK]
  
• Multi-wavelength study of the short term TeV flaring activity from the blazar Mrk 501 observed in June 2014
  Singh, K. et al., ArXiv e-prints p (2018) [LINK]
  
• The extreme HBL behaviour of Markarian 501 during 2012
  Ahnen, M.L. et al., ArXiv e-prints p (2018) [LINK]
  
• Blazar Mrk 501 shows rhythmic oscillations in its gamma-ray emission
  Bhatta, G., ArXiv e-prints p (2018) [LINK]
  
• Search for high-energy neutrino emission from Mrk 421 and Mrk 501 with the ANTARES neutrino telescope
  Organokov, M. and Pradier, T., ArXiv e-prints p (2018) [LINK]
  
• Systematic investigation of X-ray spectral variability of TeV blazars during flares in the RXTE era
  Wang, Y. et al., ArXiv e-prints p (2018) [LINK]
  
• Probing the Jets of Blazars Using the Temporal Symmetry of Their Multi-Wavelength Outbursts
  Roy, N. et al., ArXiv e-prints p (2018) [LINK]
  
• Photon-ALP oscillations from a blazar to us up to 1000 TeV
  Galanti, G. et al., ArXiv e-prints p (2018) [LINK]
  
• Infrared emission from dust and the spectral features of extragalactic gamma-ray sources
  de Matos Pimentel, D.R. and Moura-Santos, E., ArXiv e-prints p (2018) [LINK]
  
• Flux Distribution of Gamma-Ray Emission in Blazars: The Example of Mrk 501
  Romoli, C. et al., Galaxies 6 p135 (2018) [LINK]
  
• Long-term optical monitoring of TeV emitting blazars. I. Data analysis
  Nilsson, K. et al., A&A 620 pA185 (2018) [LINK]
  
• Search for Magnetically Broadened Cascade Emission From Blazars with VERITAS
  VERITAS Collaboration et al., ArXiv e-prints p (2017) [LINK]
  
• Multiwavelength study of VHE emission from Markarian 501 using TACTIC observations during April-May, 2012
  Chandra, P. et al., ArXiv e-prints p (2017) [LINK]
  
• Testing models of extragalactic gamma-ray propagation using observations of extreme blazars in GeV and TeV energy ranges
  Dzhatdoev, T.A. et al., ArXiv e-prints p (2017) [LINK]
  
• The VHE anomaly in blazar spectra and related phenomena
  Dzhatdoev, T. et al., ArXiv e-prints p (2017) [LINK]
  
• Daily monitoring of TeV gamma-ray emission from Mrk 421, Mrk 501, and the Crab Nebula with HAWC
  Albert, A. et al., ArXiv e-prints p (2017) [LINK]
  
• Black hole astrophysics with HAWC, the High Altitude Water Cherenkov gamma-ray observatory
  Alberto Carraminana for the HAWC Collaboration, ArXiv e-prints p (2017) [LINK]
  
• X-ray Intraday Variability of Five TeV Blazars with NuSTAR
  Pandey, A. et al., ArXiv e-prints p (2017) [LINK]
  
• X-ray/gamma-ray flux correlations in the BL Lacs Mrk 421 and 501 using HAWC data
  Garcia-Gonzalez, J.A. et al., ArXiv e-prints p (2017) [LINK]
  
• Spectral analysis of Markarian 421 and Markarian 501 with HAWC
  Coutino de Leon, S. et al., ArXiv e-prints p (2017) [LINK]
  
• The 2HWC HAWC Observatory Gamma-Ray Catalog
  Abeysekara, A.U. et al., ApJ 843 p40 (2017) [LINK]
  
• Search for intra-day optical variability in Mrk 501
  Feng, H. C. et al., ArXiv e-prints p (2017) [LINK]
  
• Modelling blazar flaring using a time-dependent fluid jet emission model - an explanation for orphan flares and radio lags
  Potter, W.J., ArXiv e-prints p (2017) [LINK]
  
• R-band host galaxy contamination of TeV gamma-ray blazar Mrk 501: effects of the aperture size and seeing
  Feng, H.-C. et al., ArXiv e-prints p (2017) [LINK]
  
• Hard X-ray properties of NuSTAR blazars
  Bhatta, G. et al., ArXiv e-prints p (2017) [LINK]
  
• Discovery of off-axis jet structure of TeV blazar Mrk 501 with mm-VLBI
  Koyama, S. et al., ArXiv e-prints p (2016) [LINK]
  
• Tests of the Einstein Equivalence Principle using TeV Blazars
  Wei, J.-J. et al., ArXiv e-prints p (2016) [LINK]
  
• Multi-band optical variability of three TeV Blazars on Diverse Timescales
  Gupta, A.C. et al., ArXiv e-prints p (2016) [LINK]
  
• Limits on Lorentz invariance violation at the Planck energy scale from H.E.S.S. spectral analysis of the blazar Mrk 501
  Lorentz, M. et al., ArXiv e-prints p (2016) [LINK]
  
• Very High Energy outburst of Markarian 501 in May 2009
  Aliu, E. et al., ArXiv e-prints p (2016) [LINK]
  
• Probing Acceleration and Turbulence at Relativistic Shocks in Blazar Jets
  Baring, M.G. et al., ArXiv e-prints p (2016) [LINK]
  
• First year results of the High Altitude Water Cherenkov observatory
  Carraminana, A. and for the HAWC Collaboration, ArXiv e-prints p (2016) [LINK]
  
• First Study of Combined Blazar Light Curves with FACT and HAWC
  Dorner, D. et al., ArXiv e-prints p (2016) [LINK]
  
• EBL effect on the observation of multi-TeV flaring of 2009 from Markarian 501
  Sahu, S. et al., ArXiv e-prints p (2016) [LINK]
  
• The Exceptional Flare of Mrk 501 in 2014: Combined Observations with H.E.S.S. and FACT
  Cologna, G. et al., ArXiv e-prints p (2016) [LINK]
  
• Simulating Electromagnetic Cascades in Magnetospheres of Active Galactic Nuclei
  Wendel, C. et al., ArXiv e-prints p (2016) [LINK]
  
• Multiband variability studies and novel broadband SED modeling of Mrk 501 in 2009
  Ahnen, M.L. et al., ArXiv e-prints p (2016) [LINK]
  
• Probing Precise Location of Radio Core in TeV Blazar Mrk 501 with VERA at 43 GHz
  Koyama, S. et al., ArXiv e-prints p (2015) [LINK]
  
• Synchrotron Self-Compton Emission by Relativistic Electrons under Stochastic Acceleration: Application to Mrk 421 and Mrk 501
  Kakuwa, J. et al., ArXiv e-prints p (2015) [LINK]
  
• Multi-frequency, Multi-epoch Study of Mrk 501: Hints for a Two-component Nature of the Emission
  Shukla, A. et al., ApJ 798 p2 (2015) [LINK]
  
• Spectral characteristics of Mrk 501 during the 2012 and 2014 flaring states
  Cologna, G. et al., ArXiv e-prints p (2015) [LINK]
  
• First NuSTAR Observations of Mrk 501 within a Radio to TeV Multi-Instrument Campaign
  Furniss, A. et al., ArXiv e-prints p (2015) [LINK]
  
• Rapid variability at very high energies in Mrk 501
  Chakraborty, N. et al., ArXiv e-prints p (2015) [LINK]
  
• First study of Mrk 501 through the eyes of NuSTAR, VERITAS and the LIDAR-corrected eyesight of MAGIC
  Noda, K. et al., ArXiv e-prints p (2015) [LINK]
  
• On the detectability of Lorentz invariance violation through anomalous multi-TeV gamma-ray spectra of blazars
  Tavecchio, F. and Bonnoli, G., ArXiv e-prints p (2015) [LINK]
  
• Lower Bound on the Cosmic TeV Gamma-ray Background Radiation
  Inoue, Y. and Tanaka, Y.T., ArXiv e-prints p (2015) [LINK]
  
• Multi-color optical monitoring of Mrk 501 from 2010 to 2015
  Xiong, D. et al., ArXiv e-prints p (2015) [LINK]
  
• Monitoring TeV blazars with HAWC
  Lauer, R.J. et al., ArXiv e-prints p (2015) [LINK]
  
• Increased VHE activity from Mrk 501 detected with H.E.S.S.
  Stegmann, C. for the HESS Collaboration, The Astronomer's Telegram 6268 p1 (2014) [LINK]
  
• Multiwavelength observations of Mrk 501 in 2008
  MAGIC Collaboration et al., ArXiv e-prints p (2014) [LINK]
  
• Blazar Anti-Sequence of Spectral Variation within individual Blazars: Cases for Mrk 501 and 3C 279
  Zhang, J. et al., ArXiv e-prints p (2013) [LINK]
  
• The Stability of BVRI Comparison Stars Near Selected TeV Blazars
  Pace, C.J. et al., ArXiv e-prints p (2013) [LINK]
  
• Unprecedented temporal evolution of the broad-band emission of the BL Lac Mrk 501
  Doert, M. et al., ArXiv e-prints p (2013) [LINK]
  
• TeV gamma-ray survey of the Northern sky using the ARGO-YBJ detector
  The ARGO-YBJ Collaboration et al., ArXiv e-prints p (2013) [LINK]
  
• TeV blazar variability: the firehose instability?
  Subramanian, P. et al., ArXiv e-prints p (2012) [LINK]
  
• Emitting Electrons and Source Activity in Markarian 501
  Mankuzhiyil, N. et al., ApJ 753 p154 (2012) [LINK]
  
• Long-term Monitoring of Mrk 501 for its Very High Energy Gamma Emission and a Flare in 2011 October
  Bartoli, B. et al., ApJ 758 p2 (2012) [LINK]
  
• Spectral Energy Distribution of Markarian 501: Quiescent State Versus Extreme Outburst
  Acciari, V.A. et al., ApJ 729 p2-+ (2011) [LINK]
  
• Broad Ly alpha Emission from Three Nearby BL Lacertae Objects
  Stocke, J.T. et al., ArXiv e-prints p (2011) [LINK]
  
• On the emission lines in active galactic nuclei with relativistic jets
  Foschini, L., ArXiv e-prints p (2011) [LINK]
  
• Very hard gamma-ray emission from a flare of Mrk 501
  Neronov, A. et al., ArXiv e-prints p (2011) [LINK]
  
• ''Leading blob'' model in a stochastic acceleration scenario: the case of the 2009 flare of Mkn\501
  Lefa, E. et al., ArXiv e-prints p (2011) [LINK]
  
• Multifrequency Variability and Correlations from Extensive Observing Campaigns of Mkn 421 and Mkn 501 in 2009
  Barres de Almeida, U. et al., ArXiv e-prints p (2011) [LINK]
  
• Monitoring of bright, nearby Active Galactic Nuclei with the MAGIC telescopes
  Wagner, R. et al., ArXiv e-prints p (2011) [LINK]
  
• Highlights of the VERITAS Blazar Observation Program
  Wystan Benbow for the VERITAS Collaboration, ArXiv e-prints p (2011) [LINK]
  
• Detailed Multifrequency Study of a Rapid VHE Flare of Mrk501 in May 2009
  Pichel, A. et al., ArXiv e-prints p (2011) [LINK]
  
• Rapid TeV Flaring in Markarian 501
  Zheng, Y.G. and Zhang, L., ApJ 728 p105 (2011) [LINK]
  
• Search for an extended VHE gamma-ray emission from Mrk 421 and Mrk 501 with the MAGIC Telescope
  Aleksic, J. et al., A&A 524 pA77+ (2010) [LINK]
  
• Additional acceleration of protons and energetic neutrino production in a filamentary jet of the blazar Markarian 501.
  Honda, Y.S. and Honda, M., PASJ 62 p735-742 (2010) [LINK]
  
• Insights Into the High-Energy Gamma-ray Emission of Markarian 501 from Extensive Multifrequency Observations in the Fermi Era
  The Fermi-LAT collaboration, the MAGIC collaboration, the VERITAS collaboration, the GASP-WEBT consortium, multi-wavelength partners, ArXiv e-prints p (2010) [LINK]
  
• The Jets of TeV Blazars at Higher Resolution: 43 GHz and Polarimetric VLBA Observations from 2005 to 2009
  Piner, B.G. et al., ApJ 723 p1150-1167 (2010) [LINK]
  
• Significant Limb-Brightening in the Inner Parsec of Markarian 501
  Piner, B.G. et al., ApJ 690 pL31-L34 (2009) [LINK]
  
• Fast TeV variability in blazars: jet in a jet
  Giannios, Dimitrios et al., p (2009) [LINK]
  
• Simultaneous Multiwavelength observation of Mkn 501 in a low state in 2006
  The MAGIC Collaboration: H.Anderhub et al., ArXiv e-prints p (2009) [LINK]
  
• VERITAS Observations of Mkn 501 in 2009
  Huang, D. et al., ArXiv e-prints p (2009) [LINK]
  
• Multi-wavelength Observations of Markarian 501
  Gall, D. and for the VERITAS Collaboration, ArXiv e-prints p (2009) [LINK]
  
• X-ray spectral evolution of TeV BL Lacertae objects: eleven years of observations with BeppoSAX, XMM-Newton and Swift satellites
  Massaro, F. et al., A&A 478 p395-401 (2008) [LINK]
  
• Results of observation of Cyg gamma-2, BL Lac, 3C66A, Mk 501, and the Crab nebula by the GT-48 gamma-ray telescope in 2006
  Neshpor, Y.I. et al., Bulletin Crimean Astrophysical Observatory 104 p141-144 (2008) [LINK]
  
• On the rapid TeV flaring activity of Markarian 501
  Mastichiadis, A. and Moraitis, K., ArXiv e-prints p (2008) [LINK]
  
• Very high energy Gamma-ray observations of Mrk 501 using the TACTIC imaging Gamma-ray telescope during 2005 06
  Godambe, S.V. et al., Journal of Physics G Nuclear Physics 35 p065202-+ (2008) [LINK]
  
• TeV observations of Mrk 501 with the TACTIC gamma-ray telescope during 2005-06
  Godambe, S.V. et al., Bulletin of the Astronomical Society of India 25 p67-+ (2008) [LINK]
  
• Variable Very High Energy Gamma-Ray Emission from Markarian 501
  Albert, J. et al., ApJ 669 p862-883 (2007) [LINK]
  
• Intrinsic absorbers in BL Lac objects: The XMM-Newton view
  Blustin, A.J. et al., A&A 417 p61-70 (2004) [LINK]
  
• The TeV Energy Spectrum of Markarian 501 Measured with the Stereoscopic Telescope System of HEGRA during 1998 and 1999
  Aharonian, F. et al., ApJ 546 p898-902 (2001) [LINK]
  
• Multiwavelength Observations of Markarian 501 during the 1997 High State
  Petry, D. et al., ApJ 536 p742-755 (2000) [LINK]
  
• Detection of Multi-TEV Gamma Rays from Markarian 501 during an Unforeseen Flaring State in 1997 with the Tibet Air Shower Array
  Amenomori, M. et al., ApJ 532 p302-307 (2000) [LINK]
  
• The time averaged TeV energy spectrum of MKN 501 of the extraordinary 1997 outburst as measured with the stereoscopic Cherenkov telescope system of HEGRA
  Aharonian, F.A. et al., A&A 349 p11-28 (1999) [LINK]
  
• The temporal characteristics of the TeV gamma-radiation from MKN 501 in 1997. I. Data from the stereoscopic imaging atmospheric Cherenkov telescope system of HEGRA
  Aharonian, F.A. et al., A&A 342 p69-86 (1999) [LINK]
  
• High-Energy Emission from the TEV Blazar Markarian 501 during Multiwavelength Observations in 1996
  Kataoka, J. et al., ApJ 514 p138-147 (1999) [LINK]
  
• Very High Energy Gamma-ray spectral properties of MKN 501 from CAT Cerenkov telescope observations in 1997
  Djannati-Atai , A. et al., A&A 350 p17-24 (1999) [LINK]
  
• The Flux Variability of Markarian 501 in Very High Energy Gamma Rays
  Quinn, J. et al., ApJ 518 p693-698 (1999) [LINK]
  
• The temporal characteristics of the TeV gamma -emission from MKN 501 in 1997. II. Results from HEGRA CT1 and CT2
  Aharonian, F. et al., A&A 349 p29-44 (1999) [LINK]
  
• TeV Observations of Markarian 501 with the Milagrito Water Cerenkov Detector
  Atkins, R. et al., ApJ 525 pL25-L28 (1999) [LINK]
  
• Observations of TeV gamma rays from Markarian 501 at large zenith angles
  Chadwick, P.M. et al., Journal of Physics G Nuclear Physics 25 p1749-1753 (1999) [LINK]
  
• Measurement of the Multi-TEV Gamma-Ray Flare Spectra of Markarian 421 and Markarian 501
  Krennrich, F. et al., ApJ 511 p149-156 (1999) [LINK]
  
• Observations of TeV Gamma Ray Flares from Markarian 501 with the Telescope Array Prototype
  Hayashida, N. et al., ApJ 504 pL71+ (1998) [LINK]
  
• Detection of gamma-rays above 1.5TeV from MKN 501.
  Bradbury, S.M. et al., A&A 320 pL5-L8 (1997) [LINK]
  
• Measurement of the flux, spectrum, and variability of TeV Gamma-rays from MKN 501 during a state of high activity.
  Aharonian, F. et al., A&A 327 pL5-L8 (1997) [LINK]
  
• Multiwavelength Observations of a Flare from Markarian 501
  Catanese, M. et al., ApJ 487 pL143-L146 (1997) [LINK]
  
• Detection of Gamma Rays with E > 300 GeV from Markarian 501
  Quinn, J. et al., ApJ 456 pL83+ (1996) [LINK]
  

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