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Fermi LAT detection of a new gamma-ray source PKS 2136-642

ATel #5695; Roopesh Ojha (NASA/GSFC/UMBC/CRESST) and Bryce Carpenter (Catholic U.) on behalf of the Fermi Large Area Telescope Collaboration
on 26 Dec 2013; 14:35 UT
Credential Certification: Roopesh Ojha (Roopesh.Ojha@gmail.com)

Subjects: Gamma Ray, >GeV, AGN, Blazar, Quasar

The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has observed strong gamma-ray emission from a source positionally consistent with the extragalactic radio source PKS 2136-642 (RA=21h40m00.84s, Dec=-64d01m35.0s, J2000; Mauch et al. 2003, MNRAS, 342, 1117).

Preliminary analysis indicates that on December 23 and 24, 2013, the daily averaged flux (E>100MeV) was, respectively, (1.3+/-0.4) and (1.0+/-0.4) x 10^-6 photons cm^-2 s^-1 (errors are statistical only). This source is not in any published LAT catalog. The source had a photon index of 2.2 and 2.1 (+/-0.2), respectively, on these two days which are typical values for LAT-detected FSRQs. Its variability is also consistent with LAT-detected FSRQs.

Because Fermi operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. We encourage further multifrequency observations of this source. For this source the Fermi LAT contact person is Roopesh Ojha (Roopesh.Ojha@gmail.com).

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.