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Observation Date (UT) Observation Lat

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
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
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