Fermi LAT Detection of a New Gamma-ray Source Associated with the flat-spectrum radio quasar TXS 2346+052
ATel #12427; S. Buson (Univ. of Wuerzburg, UMBC) and R. Angioni (MPIfR- Bonn) on behalf of the Fermi Large Area Telescope Collaboration
on 26 Jan 2019; 13:33 UT
Credential Certification: Sara Buson (sara.buson@gmail.com)
Subjects: Gamma Ray, Request for Observations, 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 quasar TXS 2346+052 with coordinates R.A. = 357.337715 deg, Decl. = 5.577742 deg (J2000; Petrov et al, 2005, AJ, 129, 1163) at redshift, z = 0.419 (Sbarufatti et al 2009, AJ, 137, 337). 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 on 2019 January 24 with a daily-averaged flux (E > 100 MeV) of (4.7+/-1.5) x10^-7 ph cm^-2 s^-1 with a single power-law photon index of 2.0+/-0.2 (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 contacts person 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.
