Fermi-LAT detection of a new potential gamma-ray source associated with the radio source NVSS J161018+414653
ATel #15182; G. La Mura (LIP, Portugal), on behalf of the Fermi Large Area Telescope Collaboration
on 26 Jan 2022; 14:18 UT
Credential Certification: Giovanni La Mura (glamura@lip.pt)
Subjects: Gamma Ray, Request for Observations, AGN, Transient
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 NVSS J161018+414653, also known as WISEA J161018.20+414654.0 / 87GB 160837.0+415405, with coordinates R.A. = 242.5759 deg, Decl. = +41.7816 deg (J2000; Condon et al., 1998, AJ, 115, 1693), and unknown redshift. 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 January 24, 2022, with a daily averaged gamma-ray flux (E>100MeV) of (0.3+/-0.1) X 10^-6 photons cm^-2 s^-1 and a single power-law photon index of 2.2+/-0.3 (statistical uncertainties only). The best fit gamma-ray position was located at R.A. = 242.361 deg, Decl. = +41.925 deg, with a 68% confidence radius of 0.243 deg and an angular separation of 0.215 deg from the proposed counterpart. The suggested association is based on the inclusion of the radio source in the JVAS/CLASS catalog of flat-spectrum radio sources (Jackson et al., 2007, MNRAS, 376, 371), where it is listed as GB6 161018+414636.
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 Giovanni La Mura (glamura AT lip DOT pt).
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.
