Fermi LAT detection of a GeV flare from 3C 273

Details Fermi LAT detection of a GeV flare from 3C 273 Fermi LAT detection of a GeV flare from 3C 273

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009atel.2168....1b&link_type=abstract

The Astronomer's Telegram, #2168

Astronomy and Astrophysics

Astronomy

3

Gamma Ray, >Gev, Request For Observations, Agn

Scientific paper

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 3C 273 (J2000, R.A.: 12:29:06.6997, Dec: +02:03:08.598 Johnston et al. 1995, AJ, 110, 880). Preliminary analysis indicates that the source on August 19th, 2009, has brightened to a high state with an average gamma-ray flux over the day (E>100MeV) of 3.18 ± 0.54 (statistical only) × 10-6 ph cm-2 s-1 and peaking at 5.48 ± 1.85 (statistical only) × 10-6 ph cm-2 s-1 in the 6 hour period between 0 and 6 UT of August 20th.

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