Fermi LAT detection of a GeV flare from blazar S5 1803+78
Abstract
The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has observed an increasing gamma-ray flux from a source positionally consistent with S5 1803+78 (1FGL J1800.4+7827) with coordinates RA: 18h00m45.7s, Dec: +78d28m04s (J2000). The source has a measured redshift of z=0.68 (Stickel, M., Fried, J.W., & Kuehr, H. 1993, A&AS, 98, 393). Preliminary analysis indicates that the source on May 2, 2011 was in a high state with a gamma-ray flux (E>100MeV) of (1.1 ± 0.2) e-6 ph cm-2 s-1.
- Publication:
-
The Astronomer's Telegram
- Pub Date:
- May 2011
- Bibcode:
- 2011ATel.3322....1R
- Keywords:
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- Gamma Ray;
- >GeV;
- Blazar;
- Transient