Swift Follow-up of the recent Gamma-ray flare of the FSRQ B2 0748+33
ATel #9752; Bryce Carpenter (CUA/NASA/GSFC) and Roopesh Ojha (NASA/GSFC/UMBC) on behalf of the Fermi Large Area Telescope Collaboration
on 12 Nov 2016; 22:23 UT
Credential Certification: Roopesh Ojha (Roopesh.Ojha@gmail.com)
Subjects: Ultra-Violet, X-ray, Gamma Ray, >GeV, AGN, Blazar, Quasar
Following a recent gamma-ray flare of the flat spectrum radio quasar B2 0748+33 (ATel#9590), a Swift target of opportunity observation was performed on 2016 November 1.
Swift/XRT data were taken in Photon Counting mode for a total exposure of about 3.9 ksec. The X-ray spectrum (0.5-10 keV) can be fit by an absorbed power law model with an HI column density set to the Galactic value of 4.79x10^20 cm^-2 (Kalberla et al. 2005, A&A, 440, 775) using the abundances of Wilms et al. (2000, ApJ, 542, 914) and the cross sections of Verner et al. (1996, ApJ, 465, 487). The observed flux is (3.0+/-0.6)x10^-12 ergs/cm^2/s; while the photon index is 1.6+/-0.2. There are no previous X-ray observations of this source reported in the literature.
A simultaneous UVOT observation found a W2 (1928 Angstroms) filter AB magnitude of 18.25+/-0.06 (16.52+/-0.06 Vega magnitude). A previous UV measurement from GALEX found an AB magnitude of 21.8+/-0.6 at 1538 Angstroms and 21.2+/-0.3 at 2325 Angstroms.
Further multiwavelength observations are encouraged. For this source the Fermi LAT contact person is C. C. Cheung (Teddy.Cheung at nrl.navy.mil). We would like to thank the Swift Team for making these observations possible, in particular K. L. Page as the Swift Observatory Duty Scientist.
