Fermi-LAT detection of renewed gamma-ray activity from a source associated with PMN J1336-1529
ATel #15278; G. Principe (University of Trieste and INFN - Trieste, INAF-IRA Bologna), S. Garrappa (DESY-Zeuthen) and C. C. Cheung (NRL), on behalf of the Fermi Large Area Telescope Collaboration
on 14 Mar 2022; 20:18 UT
Credential Certification: Giacomo Principe (giacomo.principe@inaf.it)
Subjects: Gamma Ray, >GeV
The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has observed renewed gamma-ray emission from a source positionally consistent with the radio source PMN J1336-1529, with coordinates R.A. = 204.142167 deg, Decl. = -15.496639 deg (J2000; Fey et al. 2015, AJ, 150, 58), unknown redshift.
Preliminary analysis indicates that this source was in an elevated gamma-ray emission state on March 13, 2022 with a daily averaged gamma-ray flux (E>100MeV) of (8.5 +/-1.4) X 10^-7 photons cm^-2 s^-1 and a hard power-law photon index of 1.8+/-0.1 (statistical uncertainties only). This corresponds to a flux increase of a factor of 10 relative to the average flux reported in the ATel #14477 (note this original report listed an incorrect RA position for the radio source) This is the highest LAT daily flux ever observed for this source. The corresponding photon index is 1.8+/-0.1, and is slightly smaller than the value previously reported 2.0+/-0.2 in the ATel #14477.
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 C. C. Cheung (Teddy.Cheung@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.
