Fermi-LAT Search for Gamma-ray Emission from AT2018cow
ATel #11808; D. Kocevski (NASA/MSFC), C. C. Cheung (NRL), on behalf of the Fermi-LAT collaboration
on 2 Jul 2018; 22:44 UT
Credential Certification: Teddy Cheung (Teddy.Cheung@nrl.navy.mil)
Subjects: Gamma Ray, >GeV, Transient
We report on a preliminary search for >100 MeV gamma-ray emission from AT2018cow (ATel #11727) with data from the Fermi Large Area Telescope (LAT). During the ~1 week interval from 2018 June 19.5 - 26.0 when the position of the optical transient was within the LAT field of view, we found no significant >100 MeV gamma-ray emission with a 95% confidence flux upper limit of <3.5 x 10^-8 ph cm^-2 s^-1. Moreover, during the 1-day interval of the reported NuSTAR detection (June 23, ATel #11775), we found no significant emission with a >100 MeV flux upper limit of <8 x 10^-8 ph cm^-2 s^-1.
Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. For this source the Fermi LAT contact persons are D. Kocevski (e-mail: daniel.kocevski at nasa.gov) and C.C. Cheung (Teddy.Cheung at nrl.navy.mil).
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.
