Fermi LAT detection of two high Galactic latitude gamma-ray sources, Fermi J1049.7+0435 and J1103.2+1145

ATel #4949; Masaki Nishimichi, and Masaki Mori (Ritsumeikan University)
on 3 Apr 2013; 23:40 UT
Credential Certification: Masaki Mori (morim@fc.ritsumei.ac.jp)

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Two new unidentified gamma-ray sources, Fermi J1049.7+0435 and J1103.2+1145, were detected by the Large Area Telescope (LAT), on board the Fermi Gamma-ray Space Telescope, in the 100 MeV to 300 GeV band during the period between 2008-08-27 and 2012-10-27. They are not listed in the 2FGL catalogue. Fermi J1049.7+0435 is at Galactic coordinates (l,b) = (245.34 deg, 53.27 deg) (R.A., Dec = 162.43 deg, 4.60 deg, J2000) with an error radius of less than 0.25 degree. There is no apparent counterpart in other wavelengths. The data is analyzed in half-year bin, and the period during which it is detected at a significance level larger than 5 sigma is from 2010-04-27 until 2012-10-27. The most active time bin is from 2011-10-27 until 2012-04-27 and its flux is (7.25 +/- 0.28) E-08 ph/cm2/s above 100 MeV. Fermi J1103.2+1145 is at Galactic coordinates (l,b) = (238.85 deg, 60.33 deg) (R.A.,Dec = 165.81 deg, 11.75 deg, J2000) with an error radius of less than 0.25 degree. A Seyfert 1 galaxy, Mrk 728, is 0.89 deg apart from J1103.2+1145 and is not likely the counterpart. The data is analyzed in half-year bin, and the period during which it is detected at a significance level larger than 5 sigma is from 2011-04-27 until 2012-10-27. Especially the last half-year data shows a flux of (6.97 +/- 0.98) E-08 ph/cm2/s above 100 MeV. Both of them lack no apparent counterparts in other wavelengths, but they could be active galactic nuclei since they are at high Galactic latitudes and their fluxes are variable.