Fermi-LAT detection of a new gamma-ray source associated with the FSRQ PMN J1254-2000
ATel #16268; Denis Bernard (LLR, Ecole Polytechnique & CNRS / IN2P3), on behalf of the Fermi Large Area Telescope Collaboration
on 4 Oct 2023; 15:01 UT
Credential Certification: Denis Bernard (Denis.bernard@in2p3.fr)
Subjects: Gamma Ray, >GeV, Request for Observations, AGN, Blazar, Quasar
The Large Area Telescope (LAT), one of the 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 PMN J1254-2000, also known as NVSS J125437-200056, CGRaBS J1254-2000, BZQ J1254-2000, with coordinates R.A. = 193.655208 deg, Decl. = -20.015694 deg (J2000; Healey et al. 2007, ApJS, 171, 61), and redshift z=0.959 (Mahony et al. 2011, MNRAS, 417, 2651). This source is not in any published LAT catalog and was not detected by AGILE or EGRET.
Preliminary analysis indicates that this source was significantly detected (>8 sigma) in a high gamma-ray state on October 3, 2023, with a daily averaged gamma-ray flux (E>100MeV) of (0.33 +/- 0.14) X 10^-6 photons cm^-2 s^-1 and a single power-law photon index of 1.64 +/- 0.21 (statistical uncertainties only).
Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. We encourage multifrequency observations of this source. For this source, the Fermi-LAT contact person is Denis Bernard (denis.bernard@in2p3.fr).
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.
