Fermi-LAT detection of enhanced gamma-ray activity from the FSRQ B2 1348+30B
ATel #15402; J. Valverde (UMBC/NASA GSFC), and J. Forman (Florida Tech.), on behalf of the Fermi Large Area Telescope Collaboration
on 29 May 2022; 01:11 UT
Credential Certification: Janeth Valverde (valverde@llr.in2p3.fr)
Subjects: Gamma Ray, >GeV, Request for Observations, AGN, Blazar
Referred to by ATel #: 15439
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 flat-spectrum radio quasar B2 1348+30B, also known as 4FGL J1350.8+3033 (The Fermi-LAT collaboration 2020, ApJS, 247, 33), with coordinates R.A. = 207.719734 deg, Decl. = +30.581553 deg (J2000; Petrov & Taylor 2011, AJ, 142, 89), and redshift z=0.71160 (Albareti et al. 2015, MNRAS, 452, 4153).
Preliminary analysis indicates that this source was in an elevated gamma-ray emission state on May 26 and 27, 2022, with a peak daily averaged gamma-ray flux (E>100MeV) of (0.9+/-0.1) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only). This corresponds to a flux increase of a factor of 60 relative to the average flux reported in the fourth Fermi-LAT catalog (4FGL). This is the highest LAT daily flux ever observed for this source. The corresponding photon index is 2.15+/-0.08, and is smaller than the 4FGL value of 2.42+/-0.05.
Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. Preliminary light curves can be accessed via the Fermi-LAT Light-Curve Repository at https://fermi.gsfc.nasa.gov/ssc/data/access/lat/lcr/source.html?source_name=4FGL_J1350.8+3033. We encourage multifrequency observations of this source. For this source, the Fermi-LAT contact person is Janeth Valverde (valverde@llr.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.
