X-ray emission at the position of SN2013by
R. Margutti, A. Soderberg, D. Milisavljevic, (Harvard University)
SN2013by (PSN J16590243-6011418) is a nearby Type IIL/IIn supernova (CBAT #3506) that exploded in ESO 138-G10 (d=14.7 Mpc from NED). We obtained Swift-XRT observations starting from 2013 April 24 until 2013 June 1, for a total exposure of 8.4 ks. An X-ray source is detected at a position consistent with SN2013by, with significance of 3.2 sigma. We measure a 0.3-10 keV count-rate of (2.1 +/- 0.7)d-3 cps. Assuming a simple power-law spectral model with photon index Gamma=2 the measured count-rate translates into an unabsorbed flux of ~1.1d-13 erg/s/cm2 (0.3-10 keV), corresponding to a luminosity L~2.9d39 erg/s at the distance of 14.7 Mpc. The Galactic neutral hydrogen absorption in the direction of SN2013by is 1.4e21 cm-2 (Kalberla 2005). Further observations are ongoing. We thank the Swift team for scheduling these ToO observations.
x-ray,supernovae