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Fermi LAT detection of increased gamma-ray activity from the blazar TXS 1318+225

ATel #4609; E. Torresi (INAF/IASF Bologna), F. D'Ammando (Dip. Physics, Univ. of Perugia), Y. Tanaka (Hiroshima University) on behalf of the Fermi Large Area Telescope Collaboration
on 28 Nov 2012; 09:15 UT
Credential Certification: Filippo D'Ammando (filippo.dammando@fisica.unipg.it)

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

Referred to by ATel #: 4616

The Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope, has observed an increase in the gamma-ray flux from a source positionally consistent with the flat spectrum radio quasar TXS 1318+225 (z=0.943, Sowards-Emmerd et al. 2003, ApJ, 590, 109; RA=200.2966771 deg, Dec=22.2700300 deg, J2000), also known as 2FGL J1321.1+2215 (Nolan et al. 2012, ApJS, 199, 31).

The source has been detected on 2012 November 25th and 26th with daily average fluxes (E> 100 MeV) of (0.8+/-0.2)x10^-6 ph cm^-2 s^-1 and (0.9+/-0.2)x10^-6 ph cm^-2 s^-1, respectively (errors are statistical only). This corresponds to a flux increase of a factor around 35 compared with the average flux reported in the second Fermi LAT catalog (Nolan et al. 2012, ApJS, 199, 31).

Since Fermi operates in all-sky survey mode, gamma-ray monitoring of this source will continue. In consideration of the activity of this source we strongly encourage multiwavelength observations. The Fermi LAT contact person for this source is E. Torresi (torresi@iasfbo.inaf.it).

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.