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Observation Date (UT) Observation Lat

Canonical Name:RX J0648.7+1516
TeVCat Name:TeV J0648+152
Other Names:VER J0648+152 GB J0648+1516
1FGL J0648.8+1516
Source Type:HBL
R.A.:06 48 45.6 (hh mm ss)
Dec.:+15 16 12 (dd mm ss)
Gal Long: 198.99 (deg)
Gal Lat: 6.32 (deg)
Distance: z=0.179
Flux:0.033 (Crab Units)
Energy Threshold:200 GeV
Spectral Index:4.4
Discovery Date:2010-03
Discovered By: VERITAS
TeVCat SubCat:Default Catalog

Source Notes:

Source position and its uncertainty:
From Aliu et al. (2011):
- R.A. (J2000): 102.19 deg +/- 0.11 deg (stat) (= 06 48 45.6)
- Dec. (J2000): 15.27 deg +/- 0.12 deg (stat) (= 15 16 12)
- The systematic pointing uncertainty is less than 25" (7 x 10-3 deg)
From Ong et al. (2010):
- RA (J2000): 06 48 49.7
- Dec (J2000): +15 16 22
- the position of 1FGL J0648.8+1516 is quoted here as it was the target of the observations
- no information available on positional uncertainty

Source Association:
From Massaro et al. (2012):
- "The association of this WISE source strongly supports its blazar
classification and given its position on the Wise Blazar Strip, we
suggest it is a new TBL (TeV-detected HBL)."
From Aliu et al. (2011):
- "Following the VHE discovery, the optical identification and spectroscopic
redshift were obtained using the Shane 3-m Telescope at the Lick Observatory,
showing the unidentified object to be a BL Lac type with a redshift of z = 0.179.
Broadband multiwavelength observations ... can be used to sub-classify the blazar
as a high-frequency-peaked BL Lac (HBL) object"
From Stephen et al. (2010):
- "All these properties suggest that the X-ray source is the likely
extragalactic counterpart of the Fermi object, probably a blazar at
low galactic latitudes."
From VERITAS ATel 2486:
- "This source is consistent with the Fermi-LAT gamma-ray source 1FGL J0648.8+1516
(RA 06 48 49.7, dec +15 16 22, J2000) and the radio and X-ray source RGB J0648+152
(RA 06 48 47.6, dec +15 16 25, J2000), of unknown redshift."

Spectral Properties:
From Aliu et al. (2011):
- 4.4 +/- 0.8(stat) +/- 0.3(syst)
From Benbow et al. (2011):
- Spectral index: 4.4 +/- 0.8

From Aliu et al. (2016):
- "Two spectra were obtained during the nights of UT 2010 March 18 and
2010 November 6 (MJD 55245 and 55506, respectively) with the KAST
double spectrograph on the Shane 3 m Telescope at UCO/Lick
- "Inspection of the March spectrum reveals Ca H+K absorption lines at
redshift z = 0.179. This redshift is confirmed in the second spectrum
at higher signal-to-noise ratio."

Seen by: VERITAS
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