[ Previous | Next | ADS ]

Fermi LAT detection of an increase of gamma-ray activity of S5 1044+71

ATel #5784; F. D'Ammando (INAF-IRA Bologna), M. Orienti (INAF-IRA Bologna) on behalf of the Fermi Large Area Telescope Collaboration
on 21 Jan 2014; 23:25 UT
Credential Certification: Filippo D'Ammando (filippo.dammando@fisica.unipg.it)

Subjects: Gamma Ray, >GeV, AGN, Black Hole, Blazar, Quasar

Referred to by ATel #: 5792, 9928

The Large Area Telescope (LAT), on board the Fermi Gamma-ray Space Telescope, has observed gamma-ray flaring activity from a source positionally consistent with the flat spectrum radio quasar S5 1044+71 (also known as 2FGL J1048.3+7144, Nolan et al. 2012, ApJS, 199, 31) with radio coordinates R.A.: 162.1150829 deg, Dec: 71.7266494 deg (J2000; Johnston et al. 1995, AJ, 110, 880) at redshift z=1.15 (Polatidis et al. 1995, ApJS, 98, 1).

Preliminary results indicate that S5 1044+71 started to increase its gamma-ray activity on 2014 January 16, with a daily flux (E > 100 MeV) of (0.9+/-0.4) x10^-6 ph cm^-2 s^-1 (errors are statistical only), reaching the peak flux of (1.3+/-0.4) x10^-6 ph cm^-2 s^-1 on 2014 January 17. The observed daily flux is about a factor of 23 greater than the average flux reported in the second Fermi LAT catalog (2FGL, Nolan et al. 2012, ApJS, 199, 31).

Because Fermi operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. In consideration of the ongoing activity of this source we encourage multiwavelength observations. For this source the Fermi LAT contact person is F. D'Ammando (dammando@ira.inaf.it).

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.