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Observation Date (UT) Observation Lat

Canonical Name:B3 2247+381
TeVCat Name:TeV J2250+384
Other Names:1FGL J2250.1+3825
Source Type:HBL
R.A.:22 50 06.6 (hh mm ss)
Dec.:+38 25 58 (dd mm ss)
Gal Long: 98.27 (deg)
Gal Lat: -18.56 (deg)
Distance: z=0.1187
Flux:0.04 (Crab Units)
Energy Threshold:150 GeV
Spectral Index:3.2
Discovery Date:2010-10
Discovered By: MAGIC
TeVCat SubCat:Default Catalog

Source Notes:

Source position and its uncertainty:
From Aleksic et al. (2012):
- "The source position and extension, determined by a 2D Gaussian fit
of the sky map produced with the cuts above, are consistent with a point-like
source placed at the position of B3 2247+381 within 0.015 deg, well within
the statistical uncertainty and the systematic pointing uncertainties of MAGIC."
From Mariotti et al. (2010):
- The source is positionally consistent with the Fermi-LAT gamma-ray
source 1FGL J2250.1+3825 (RA 22 50 06.6 dec +38 25 58, J2000)
- no uncertainty on the position is provided

From ATel 2910:
The MAGIC observations were triggered by an optical
high-state of the source, reported by the Tuorla blazar monitoring program.

Spectral Properties:
From Aleksic et al. (2012):
- Spectral index: 3.2 +/- 0.5(stat) +/- 0.5(syst)
From Berger et al. (2011):
- Spectral index: 3.2 +/- 0.5(stat) +/- 0.5(syst)

From Berger et al. (2011):
- The flux is quoted as 4% of the Crab Nebula above an energy
threshold of 150 GeV (abstract) and 2% of the Crab Nebula flux above
150 GeV (main text)

Seen by: MAGIC
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