Fermi-LAT detection of a new gamma-ray source associated with the radio source CRATES J0105+1912
ATel #15273; G. Principe (University of Trieste and INFN - Trieste, INAF-IRA Bologna), S. Garrappa (DESY-Zeuthen), on behalf of the Fermi Large Area Telescope Collaboration
on 13 Mar 2022; 00:29 UT
Credential Certification: Giacomo Principe (giacomo.principe@inaf.it)
Subjects: Gamma Ray, >GeV, AGN
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 radio source CRATES J0105+1912, also known as SDSS J010555.23+191228.0, with coordinates R.A. = 16.48017 deg, Decl. = +19.20780 deg (J2000; Healey et al, 2007, ApJS 171, 61-71), and redshift z=0.87862 (SDSS-DR13, Albareti et al., 2017, ApJS, 233 25). 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 (>5 sigma) in a high gamma-ray state on March 11, 2022 with a daily averaged gamma-ray flux (E>100MeV) of (6.8+/-1.6) X 10^-7 photons cm^-2 s^-1 and a single power-law photon index of 2.1+/-0.2 (statistical uncertainties only). The best fit gamma-ray position was located at R.A. = 16.43 deg, Decl. = +19.18 deg, with a 68% confidence radius of 0.19 deg and an angular separation of 0.05 deg from the proposed counterpart.
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 Giacomo Principe (giacomo.principe@ts.infn.it).
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.
