Fermi LAT Detection of a New Gamma-ray Transient in the Galactic Plane: Fermi J0008+6829
ATel #14089; I. Mereu (INFN Perugia) on behalf of the Fermi Large Area Telescope Collaboration
on 12 Oct 2020; 17:18 UT
Credential Certification: Isabella Mereu (mereuisabella@gmail.com)
Subjects: Gamma Ray, >GeV, Request for Observations, AGN, Blazar
Referred to by ATel #: 15740
On 10 October 2020 the Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, observed gamma-ray emission from a new transient source, Fermi J0008+6829. Preliminary analysis indicates a daily averaged gamma-ray flux (E>100MeV) of (8 +/- 3) X 10^-7 photons cm^-2 s^-1 (statistical uncertainty only), with TS = 50 (corresponding to >5 sigma formal significance) and a photon index = 2.2 +/- 0.2.
The best-fit location of this gamma-ray source (R.A. = 2.07 deg, Decl. = 68.49 deg, J2000) has a 95% containment radius of 0.18 deg. This source is located near the Galactic plane (l, b = 119.0 deg, 6.0 deg). The closest gamma-ray candidate counterpart is the source 4FGL J0009.2+6847 (The Fermi-LAT Collaboration 2020, ApJS, 247, 33), with coordinates R.A. = 2.31 deg, Decl. = 68.79 deg (J2000) and a 95% containment radius = 0.12 deg, at an angular distance of 0.31 deg from the Fermi J0008+6829 best-fit localization.
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.
