{
  "subject": "GRB 141215A: further Swift-XRT observations and afterglow detection",
  "eventId": "GRB 141215A",
  "bibcode": "2014GCN.17217....1D",
  "createdOn": 1419267401000,
  "circularId": 17217,
  "submitter": "Valerio D'Elia at ASDC  <delia@asdc.asi.it>",
  "email": "delia@asdc.asi.it",
  "body": "V. D'Elia (ASDC), L. Izzo (URoma/ICRA) & M. M. Chester (PSU) report on  \nbehalf of the Swift team\n\nSwift-XRT observed again the field of the IPN GRB 141215A (Hurley et  \n��al. GCN 17186). The  observation started on 2014-12-21 at 01:22UT,  \ni.e., ~5.5 days after the burst detection. Source #1 (that with a  \n2MASS counterpart) and source #3 (which has a DSS counterpart)  \nreported by D'Elia & Izzo (GCN 17190) are still detected with a count  \nrate comparable to that of the first exposure and are thus not related  \nwith the GRB. On the other hand, source #2 faded  considerably with  \nrespect to the first observation. Its decay index is alpha~1, which is  \nconsistent with a typical afterglow behavior. We thus conclude that  \nsource #2 is the X-ray counterpart of GRB 141215A.\n\nSwift/UVOT observed the initial two tiled fields for GRB 141215A  \nbeginning ~100 ks after the IPN trigger. No optical counterpart was  \ndetected for Swift/XRT Source #2 (D'Elia et al. GCN Circ. 17190).  \nPreliminary 3-sigma upper limits using the UVOT photometric system  \n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) are:\n\nSource #2:\nFilter         T_start(s)   T_stop(s)      Exp(s)      UL\nwhite          118715       125192         1026      > 21.35\nv              119529       120370          824      > 19.39\nu              117902       124472         1580      > 20.85\n\nThe magnitudes in the table are not corrected for the Galactic  \nextinction due to the reddening of E(B-V) = 0.176 in the direction of  \nthe burst (Schlegel et al. 1998).\n\nDetails on the XRT analysis can be found at:\n\nhttp://www.swift.ac.uk/xrt_products/TILED_GRB00035/\n\nThis is an official product of the Swift team."
}