Swift Observation of IC 310
ATel #4581; Felicia Krauss (ECAP/FAU Erlangen/Univ. Wuerzburg), Dorit Eisenacher (Wuerzburg), Matthias Kadler (Wuerzburg), Joern Wilms (ECAP), Dominik Elsaesser (Wuerzburg), Karl Mannheim (Wuerzburg), Neil Gehrels (GSFC)
on 16 Nov 2012; 17:27 UT
Credential Certification: Joern Wilms (j.wilms@sternwarte.uni-erlangen.de)
Subjects: X-ray, AGN, Blazar
Swift-observations of the active galaxy IC 310 performed on
MJD56245.67 (2012-11-14T16:08 until 2012-11-14T19:39) show the source
spectrum to be similar to an earlier Swift observation in 2012 January,
but a factor 1.5 brighter. The observations reported here were carried
out quasi-simultaneously with ground based observations with the MAGIC
telescopes as part of a multiwavelength radio VLBI to TeV campaign.
Based on the Swift quick look data, the current Swift-XRT count rate
is 0.24 counts/s (0.5-10keV). The spectrum can be well described by an
absorbed power law with a photon index of 1.94(16) and NH=1.3(4)10^21
cm^-2, corresponding to a 2-10keV flux of 6.4(8) 10^-12 cgs (numbers
in parentheses give the 90% confidence interval for one interesting
parameter in units of the last digit shown). The measured NH value is
consistent with the Galactic 21cm NH as obtained from the
Leiden-Argentine-Bonn survey (Kalberla et al., 2005, Astron. Astrophys. 440, 775).
In 2012 January, the photon index was 2.14(12).
Compared to the 2003 February 26 XMM-Newton observations of IC 310
(Sato et al., 2005, PASJ 57, 743) the source flux is now enhanced
by a factor of 4.6 and the source spectrum is significantly harder
(XMM-Value: 2.5).
The optical/UV flux from the Swift-UVOT is virtually unchanged
compared to 2012 January and appears to be dominated by the host galaxy.
