Fermi LAT detection of a very intense GeV flare from 4C +21.35 (PKS 1222+21)

Details Fermi LAT detection of a very intense GeV flare from 4C +21.35 (PKS 1222+21) Fermi LAT detection of a very intense GeV flare from 4C +21.35 (PKS 1222+21)

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010atel.2687....1i&link_type=abstract

The Astronomer's Telegram, #2687

Astronomy and Astrophysics

Astronomy

3

Gamma Ray, >Gev, Request For Observations, Agn, Blazars

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 4C +21.35 (also known as PKS 1222+21 and PKS B1222+216, RA: 12h24m54.5s, Dec: +21d22m46.4s, J2000, Beasley et al. 2002, ApJS, 141, 13) at z=0.43. Preliminary analysis indicates that the source on June 18, 2010 showed a bright flare with a daily flux (E>100MeV) of (12.46 ± 0.79) x 10^- 6 photons cm^- 2 s^- 1 (statistical only), which represents an increase by a factor of about 3 with respect to the average flux level in the past week.

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