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Swift Follow-up of Recent Gamma-ray Flaring Activity from PMN J2052-5533

ATel #8114; Bryce Carpenter (CUA/NASA/GSFC), Roopesh Ojha (NASA/GSFC/UMBC) and Jeffrey D. Magill (UMCP/NASA/GSFC) on behalf of the Fermi Large Area Telescope Collaboration
on 2 Oct 2015; 14:43 UT
Credential Certification: Roopesh Ojha (Roopesh.Ojha@gmail.com)

Subjects: Optical, Ultra-Violet, X-ray, Gamma Ray, >GeV, AGN, Blazar, Quasar

Referred to by ATel #: 8282

Following the gamma-ray detection of flaring activity from the blazar PMN J2052-5533 by Fermi-LAT on 2015 September 23 (ATel #8096), two Swift target of opportunity observations were performed, on 2015 September 25 and 26.

Swift/XRT data were taken in Photon Counting mode for total exposures of about 2.0 ksec and 3.0 ksec, respectively. 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 4.25x10^20 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 fluxes are (4.2^{+2.7}_{-1.6})x10^-13 erg cm^-2 s^-1 and (6^{+11}_{-5})x10^-14 erg cm^-2 s^-1; while the photon indexes are 2.0 +/- 0.7 and 2.5 +/- 2.1, respectively. This source has not been observed by Swift before.

Simultaneous Swift/UVOT observations were made in all filters for both observations. However the detections are either faint or upper limits.

Filter 2015-09-25 (mag) 2015-09-26 (mag)
B > 16.27 19.06 +/- 0.36
M2 18.91 +/- 0.16 > 18.34
U > 18.48 18.78 +/- 0.39
V > 18.21 > 17.70
W1 18.64 +/- 0.37 19.14 +/- 0.37
W2 19.70 +/- 0.41 > 19.88

Further multiwavelength observations are encouraged. For this source the Fermi LAT contact person is Bryce Carpenter (carpbr01@gmail.com).

We would like to thank the Swift Team for making these observations possible, in particular D. Malesani as the Swift Observatory Duty Scientist.