Swift also confirms the increased activity from blazar PMN J2345-1555
ATel #4742; D. Donato (NASA/GSFC), C. C. Cheung (NRL), Y. Tanaka (Hiroshima University); on behalf of the Fermi Large Area Telescope Collaboration
on 17 Jan 2013; 22:20 UT
Credential Certification: Teddy Cheung (ccheung@milkyway.gsfc.nasa.gov)
Subjects: Ultra-Violet, X-ray, Blazar
Following the Fermi-LAT detection of increased GeV activity from the z=0.621 blazar PMN J2345-1555 on January 13th (ATEL #4735), we obtained a 4.2 ksec Swift observation on January 14th. The Swift observation confirms that the blazar is also in a high X-ray/UV state in comparison to previous observations obtained in 2009 and 2010 (ATEL #2986).
Assuming an absorbed single power-law model for the XRT data in the 0.3-10 keV range (Galactic N_H = 1.74 x 10^20 cm^-2; Kalberla et al. 2005, A&A, 440, 775), the data were best fit with a photon index = 2.06 +/- 0.15 and an unabsorbed 0.3-10 keV flux = 3.63 (+/- 0.44) x 10^-12 erg cm^-2 s^-1 that is 2.6 times greater than observed in October 2010 (ATEL #2986).
The blazar is also well detected with the UVOT in the W2-band with magnitude 13.41 +/- 0.02. This is 1.0 mag brighter than observed in October 2010 (ATEL #2986).
In consideration of the recent activity of this source we encourage further multiwavelength observations. For this source the Fermi LAT contact persons are S. Ciprini (stefano.ciprini@asdc.asi.it) and Y. Tanaka (ytanaka@hep01.hepl.hiroshima-u.ac.jp).
We thank the Swift team for their rapid scheduling of these observations.
