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Fermi LAT detection of a GeV flare from the FSRQ PKS 2032+107

ATel #7453; M. Orienti (INAF-IRA Bologna), F. D'Ammando (Univ. Bologna, INAF-IRA Bologna) on behalf of the Fermi Large Area Telescope Collaboration
on 28 Apr 2015; 08:49 UT
Credential Certification: Monica Orienti (orienti@ira.inaf.it)

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

Referred to by ATel #: 7457, 7460, 7588, 7589, 8043, 8274

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 PKS 2032+107 (also known as 3FGL J2035.3+1055, Acero et al. 2015, arXiv:1501.02003) with radio coordinates R.A.: 308.8430554 deg, Dec: 10.9352192 deg (J2000, Beasley et al. 2002, ApJS, 141, 13) at redshift z=0.601 (Antonucci et al. 1987, AJ, 93, 785).

Preliminary analysis indicates that the source brightened in gamma rays with a daily averaged gamma-ray flux (E > 100 MeV) of (1.2+/-0.2) x10^-6 ph cm^-2 s^-1 (errors are statistical only) on 2015 April 26, about a factor of 22 greater than the average flux reported in the third Fermi LAT catalog.

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 M. Orienti (orienti@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.