Fermi/LAT Observations of the Gamma-ray Transient AGL 2103+5650
ATel #3554; P. H.T. Tam (NTHU, Taiwan), H. F. Yu, E. M.H. Wu (HKU), A. K.H. Kong (NTHU, Taiwan)
on 13 Aug 2011; 09:14 UT
Credential Certification: Albert Kong (akong@phys.nthu.edu.tw)
Subjects: Gamma Ray, >GeV, Transient
We report on Fermi/LAT observations of the gamma-ray transient AGL 2103+5650 as reported by the AGILE collaboration (ATel #3544).
Using the data obtained during the same time frame in which AGILE saw a 4.8 sigma detection (i.e., 2011-08-08 04:10 UT to 2011-08-10 09:04 UT), we carried out an unbinned likelihood analysis of a circular region of 10-degree radius around the position (R.A.=315.8 deg, Dec.=56.5 deg; J2000). All 2FGL catalog sources within 20 degrees from the above position are modeled, as well as the Galactic diffuse and the isotropic diffuse components. No significant gamma-ray emission above 100 MeV was detected in the LAT data. We place a 95% C.L. upper limit at ~9.8 x 10^-8 ph/cm^2/s between 100 MeV and 300 GeV, which is lower than the reported flux of (3.0+/-0.9) x 10^-6 ph/cm2/s (E > 100 MeV) in ATel #3544.