Fermi-LAT detection of enhanced gamma-ray activity from GB6 J1106+3626
ATel #14443; I. Mereu (INFN Perugia) on behalf of the Fermi Large Area Telescope Collaboration
on 6 Mar 2021; 21:30 UT
Credential Certification: Isabella Mereu (mereuisabella@gmail.com)
Subjects: Gamma Ray, >GeV, Request for Observations, AGN, Blazar, Quasar
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 GB6 J1106+3626, also known as 4FGL J1106.7+3623 (The Fermi-LAT Collaboration 2020, ApJS, 247, 33), with coordinates R.A. = 166.6522458 deg, Decl. = 36.4471472 deg (J2000; Becker, et al. 1995, ApJS, 450, 559), and redshift z=1.56 (Hewett et al. 2010, MNRAS, 405, 230).
Preliminary analysis indicates that GB6 J1106+3626 was in an elevated gamma-ray emission state on March 4, 2020, with a daily averaged gamma-ray flux (E>100MeV) of (4.0+/- 1.6) X 10^-7 photons cm^-2 s^-1 (statistical uncertainty only). This corresponds to a flux increase of a factor of about 65 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 2.4+/-0.3, and is smaller than the 4FGL value of 2.79 +/- 0.21. This source reached its highest flux in the six hour interval 12:00-18:00 UTC with a value of (7.6 +/- 3.5)x10^-7 photons cm^-2, corresponding to a flux increase of a factor about 120 relative to the average flux reported in the fourth Fermi-LAT catalog (4FGL). The corresponding photon index is 2.2 +/- 0.4.
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 Isabella Mereu (mereuisabella@gmail.com).
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.
