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Fermi LAT detection of a GeV flare from the FSRQ PKS 0727-11

ATel #2860; F. D'Ammando (INAF-IASF Palermo) on behalf of the Fermi Large Area Telescope Collaboration
on 23 Sep 2010; 16:02 UT
Distributed as an Instant Email Notice Request For Observations
Credential Certification: Filippo D'Ammando (filippo.dammando@iasf-roma.inaf.it)

Subjects: Gamma Ray, >GeV, Request for Observations, AGN, Blazar, Quasar

Referred to by ATel #: 2895, 2901

The Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope has observed an increasing gamma-ray flux from a source positionally consistent with the Flat Spectrum Radio Quasar PKS 0727-11 (also known as PKS 0727-115 and 1FGL J0730.3-1141, Abdo et al. 2010, ApJS, 188, 405; R.A.: 07:30:19.11248, Dec.: -11:41:12.6006, J2000, Petrov & Kovalev, in prep., http://astrogeo.org/rfc ; z=1.59, Zensus et al. 2002).

Preliminary analysis indicates that PKS 0727-11 on September 21, 2010 was in a high state with a daily gamma-ray flux (E > 100MeV) of (1.4+/-0.4)x10^-6 photons/cm^2/s (errors are statistical only), which represents an increase of a factor of about 3.5 with respect to the average source flux observed in the first eleven months of Fermi observations (Abdo et al. 2010). Increasing gamma-ray activity with respect to the previous months from this source was detected by Fermi LAT on January 2009 (ATel #1919).

Because Fermi operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. The source will be in the LAT field of view also during the ongoing Fermi ToO on Crab. In consideration of the activity of this source we strongly encourage multiwavelength observations. For this source the Fermi LAT contact person is A. Tramacere (e-mail: andrea.tramacere@unige.ch).

The Fermi LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.