Fermi-LAT detection of enhanced gamma-ray activity from the radio source GB6 J1102+7019
ATel #16175; Denis Bernard (LLR, Ecole Polytechnique & CNRS / IN2P3), on behalf of the Fermi Large Area Telescope Collaboration
on 6 Aug 2023; 18:46 UT
Credential Certification: Denis Bernard (Denis.bernard@in2p3.fr)
Subjects: Gamma Ray, >GeV, Request for Observations, AGN, Blazar
The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has observed enhanced gamma-ray activity from a source positionally consistent with the radio source GB6 J1102+7019, also known as 4FGL J1101.3+7017 (The Fermi-LAT collaboration 2020, ApJS, 247, 33), with coordinates R.A. = 165.505638 deg, Decl. = +70.315908 deg (J2000; Jackson et al., 2007, MNRAS, 376, 371).
Preliminary analysis indicates that this source was in an elevated gamma-ray emission state on August 4, 2023, with a daily averaged gamma-ray flux (E>100MeV) of (0.4 +/- 0.1) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only). This corresponds to a flux increase of a factor of 40 relative to the average flux reported in the fourth Fermi-LAT catalog (4FGL). The corresponding photon index is 2.5 +/- 0.2 and is smaller than but consistent with the 4FGL value of 2.7 +/- 0.4 within the uncertainties.
About half of the signal was detected in the 18:00 - 24:00 UTC time range, with an averaged gamma-ray flux (E>100MeV) of (0.8 +/- 0.3) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only). This corresponds to a flux increase of a factor of 80 relative to the average flux reported in the fourth Fermi-LAT catalog (4FGL).
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.
