{
  "bibcode": "2013GCN.14893....1T",
  "body": "N. R. Tanvir (U. Leicester), A. J. Levan (U. Warwick), A. S. Fruchter (STScI),\nJ. Hjorth (DARK/NBI) and K. Wiersema (U. Leicester) report:\n\nWe observed the location of GRB 130603B with HST/ACS and\nWFC3/IR.  The host galaxy is clearly resolved as a disturbed spiral,\nand it appears that the GRB occurred close to a spiral\narm that seems to have been tidally distorted or drawn out\nby interaction with a smaller neighbour.\n\nOur provisional analysis finds a point-source limit of F606W>27.6,\ncorresponding to M_V~-14.3, at the location of the GRB.  This is \napproaching a factor ~100 below what would be expected if there \nwere a rising supernova comparable to SN1998bw, ruling out such an \nassociation for this burst.  It also rules out some part of the parameter\nspace of other radioactively-powered transients that have been\nproposed may accompany short GRBs.\n\nThe position of the GRB lands on a region of extended emission in\nthe F160W (H') filter of WFC3/IR.    Another epoch scheduled for a\nfew weeks from now will allow a deeper search for a counterpart\nthrough image subtraction.\n\nWe thank the STScI director and staff for rapidly expediting\nthese observations.",
  "circularId": 14893,
  "createdOn": 1371158332000,
  "email": "nrt3@star.le.ac.uk",
  "subject": "GRB 130603B: HST limits on an underlying supernova",
  "submitter": "Nial Tanvir at U.Leicester  <nrt3@star.le.ac.uk>",
  "eventId": "GRB 130603B"
}