Swift Follow-up of the New Gamma-ray Detection of PKS 0131-522
ATel #6256; B. Carpenter (CUA/NASA/GSFC), J. Becerra (NASA/GSFC/UMCP/CRESST), M. Ojha (NASA/GSFC/UMBC/CRESST) on behalf of the Fermi LAT Collaboration.
on 22 Jun 2014; 01:57 UT
Credential Certification: Roopesh Ojha (Roopesh.Ojha@gmail.com)
Subjects: Ultra-Violet, X-ray, Gamma Ray, >GeV, AGN, Black Hole, Blazar, Quasar
Referred to by ATel #: 15784
Following the gamma-ray detection of PKS 0131-522 by Fermi/LAT on 2014 June 5, 6 and 7 (ATel #6223), two Swift target of opportunity observations were performed on 2014 June 12 and 2014 June 17.
Swift/XRT data were taken in Photon Counting mode for an exposure of 2.3 ksec on June 12 and 2.2 ksec on June 17. The X-ray spectrum (2-10 keV) can be fit by an absorbed power law model with the HI column density set to the Galactic value of 2.29x10^20 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 corresponding observed 0.5-10 keV flux is (1.4+/-0.4)*10^-12 erg cm^-2 s^-1 on June 12 and (2.4+/-0.5)*10^-12 erg cm^-2 s^-1 on June 17.
Simultaneous Swift/UVOT observations are shown below. Magnitudes are in the AB system.
Filter 06/12/14 06/17/14
V: 17.56+/-0.24 17.72+/-0.21
B: 17.91+/-0.17 17.89+/-0.14
U: 18.01+/-0.23 17.80+/-0.10
W1: 18.16+/-0.10 18.20+/-0.10
M2: 18.19+/-0.08 18.09+/-0.14
W2: 18.57+/-0.09 18.57+/-0.09
Further multiwavelength observations are encouraged. For this source the Fermi LAT contact person is Josefa Becerra (josefa.becerra@nasa.gov).
We would like to thank the Swift Team for making these observations possible, in particular J. A. Kennea as the Swift Observatory Duty Scientist.
