Swift observations of the young SN II in NGC 5669 (SN2013ab)
ATel #4832; R. Margutti, A. M. Soderberg, D. Milisavljevic (Harvard Univ.)
on 21 Feb 2013; 19:05 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: D. Milisavljevic (dmilisav@cfa.harvard.edu)
Subjects: Optical, Ultra-Violet, Supernovae, Transient
SN2013ab has been recently classified as a young type II supernova in NGC 5669 (CBET 3422, Atel #4823, Atel #4824).
A Swift-ToO was executed starting from 2013-02-21T02:31:55 UT. Using 1.2 ks of Swift/XRT observation we find no evidence for X-ray emission arising from PSN J14324449+0953123 down to a 3-sigma limit of 1.2E-02 cts/s in the 0.3-10 keV energy band. The Galactic neutral hydrogen column density in the direction of the transient is 1.87d20 1/cm2 (Kalberla 2005). Adopting a spectral photon index ~2, this translates into a flux <5.8d-13 erg/s/cm2 (corresponding to a luminosity limit of 4.3d40 erg/s for a luminosity distance of ~25 Mpc, from NED).
Simultaneous Swift/UVOT observations have been obtained in the 6 optical/UV filters. SN2013ab is well detected in all filters. Including some contamination from the host galaxy, we measure the following preliminary magnitudes: v=14.95+/-0.07, b=14.88+/-0.05, u=13.59+/-0.05, w1=13.34 +/- 0.06, w2=13.39+/-0.05, m2=13.25+/-0.06 (UVOT photometric system Breeveld et al. 2011, arXiv:1102.4717).
We thank the Swift team for scheduling these ToO observations.
