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Fermi LAT Detection of a New Gamma-ray Source Associated with PMN J2322-0736

ATel #10326; C. C. Cheung (NRL), S. Ciprini (ASI SSDC Rome & INFN Perugia), D. Kocevski (NASA/MSFC), S. Buson (NASA/GSFC), on behalf of the Fermi Large Area Telescope Collaboration
on 28 Apr 2017; 15:19 UT
Credential Certification: Teddy Cheung (ccheung@milkyway.gsfc.nasa.gov)

Subjects: Gamma Ray, >GeV, AGN, Blazar

The Large Area Telescope (LAT), one of two instruments on the Fermi Gamma-ray Space Telescope, has observed gamma-ray emission from a source positionally consistent with the flat-spectrum radio source, PMN J2322-0736 with radio coordinates R.A. = 350.71704 deg, Decl. = -7.6182 deg (J2000; Healey et al. 2007 ApJS 171, 61) and no known redshift. The gamma-ray source is not in any published LAT catalog and was not detected by AGILE or EGRET.

Preliminary analysis indicates that the source was detected in gamma rays in the week from 2017 Apr 17.0-24.0 by the 'Fermi All-sky Variability Analysis' (FAVA) that searches the entire sky for high-energy transients on weekly time scales (see: https://fermi.gsfc.nasa.gov/ssc/data/access/lat/FAVA/Sources.php?week=455 ) with high-significance (9.6 sigma) in the 0.8-300 GeV band. On 2017 April 23, the daily-averaged flux (E > 100 MeV) was (0.5+/-0.2) x10^-6 ph cm^-2 s^-1 with a single power-law photon index of 2.6 +/- 0.4 (errors are statistical only).

Because Fermi operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. In consideration of the activity of this source we encourage multiwavelength observations. For this source the Fermi LAT contact person is C. C. Cheung (Teddy.Cheung at nrl.navy.mil).

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.