[ Previous | Next | ADS ]

Fermi LAT Detection of a new Gamma-ray source Fermi J0507-5641

ATel #6655; B. Carpenter(NASA/GSFC/Catholic U.), R. Ojha (NASA/GSFC/UMBC/CRESST), on behalf of the Fermi Large Area Telescope Collaboration
on 2 Nov 2014; 04:28 UT
Credential Certification: Roopesh Ojha (Roopesh.Ojha@gmail.com)

Subjects: Gamma Ray, >GeV, AGN, Black Hole, 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 new source. The preliminary best-fit location of this gamma-ray source (RA=76.89 deg, Dec=-56.70 deg, J2000) has a 95% containment radius of 0.25 deg (errors are statistical only) for observations on Oct 31, 2014. This source is not in any published LAT catalog and was not detected by AGILE or EGRET. The closest candidate counterpart is the radio source PMN J0508-5628 with coordinates 05h08m24.52s -56d28m28.6s (J2000; Mauch et al. 2003, MNRAS, 342, 1117), at an angular distance of 0.25 deg.

Preliminary analysis indicates that on Oct 31, 2014, the daily averaged flux (E>100MeV) was (0.4+/-0.1) photons cm^-2 s^-1 respectively (errors are statistical only). The source had a photon index of (2.4+/-0.1) which is a typical value for LAT-detected Flat Spectrum Radio Quasars.

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 Bryce Carpenter (carpbr01@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.