Fermi LAT Detection of a New Gamma-ray Source Associated with the flat-spectrum radio quasar B2 1751+28
ATel #12461; S. Buson (Univ. of Wuerzburg, UMBC), R. Angioni (MPIfR-Bonn) and S. Cutini (INFN-Perugia) on behalf of the Fermi Large Area Telescope Collaboration
on 1 Feb 2019; 17:10 UT
Credential Certification: Sara Buson (sara.buson@gmail.com)
Subjects: Gamma Ray, >GeV, Request for Observations, AGN, Blazar, Quasar
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 quasar B2 1751+28 (a.k.a. BZQ J1753+2848) with coordinates R.A. = 268.426973 deg, Decl. = 28.801372 deg (J2000; Johnston et al, 1995 AJ, 110, 880) at redshift, z = 1.118 (Healey et al 2008 ApJS, 175, 97). This source is not in any published LAT catalog and was not detected by AGILE or EGRET.
Preliminary analysis indicates that the source was significantly (>5sigma) detected in a high gamma-ray state between 2019-01-30 00:00:00 and 2019-02-01 00:00:00 UT, with a two-daily-average flux (E > 100 MeV) of (3.5+/-0.6) x10^-7 ph cm^-2 s^-1 with a single power-law photon index of 2.1+/-0.1 (errors are statistical only).
Since Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. In consideration of the ongoing activity of this source, we encourage multiwavelength observations. For this source the Fermi-LAT contact persons are S. Buson (buson at astro.uni-wuerzburg.de) and R. Angioni (angioni at mpifr-bonn.mpg.de).
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.
