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.
