Fermi LAT detection of Increased Flux from new gamma-ray blazar PKS 0250-225

Details Fermi LAT detection of Increased Flux from new gamma-ray blazar PKS 0250-225 Fermi LAT detection of Increased Flux from new gamma-ray blazar PKS 0250-225

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009atel.1933....1c&link_type=abstract

The Astronomer's Telegram, #1933

Astronomy and Astrophysics

Astronomy

2

Gamma Ray, >Gev, Transients

Scientific paper

The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope (formerly GLAST, launched June 11, 2008), has observed an increasing gamma-ray flux from a source positionally consistent with PKS 0250-225 (RA: 02h52m47.9s, Dec:-22d19m25s, J2000). Preliminary analysis indicates that PKS 0250-225 (z=1.427 ; as CGRaBS J0252-2219 in Healey S. et al. 2007, ApJS, 175, 97) has been in a high state since Feb 17 with a gamma-ray flux (E>100MeV) of (0.5 +/- 0.1) x 10-6 ph cm-2 s-1, which represents a > 3-fold increase in flux with respect to the average preliminary flux observed during the first 6 months of data of the Fermi mission and about an 8-fold increase with respect to the first 3 months, suggesting thus a long-term trend of increasing flux.

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