{
  "bibcode": "2014GCN.15972....1H",
  "body": "S. T. Holland (STScI) and J. L. Racusin (NASA/GSFC) report on behalf\nof the Swift/UVOT team:\n\n    The Swift/UVOT began settled observations of the field of GRB\n140311B 3398 s after the BAT trigger (Racusin et al. 2014, GCNC\n15945). We do not detect any new source consistent with the Nansan\nafterglow position (Xu et al. 2014, GCNC 15949) in any of the UVOT\nexposures. Preliminary 3-sigma upper limits, using the UVOT\nphotometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373),\nfor the finding chart and summed exposures are presented below.\n\n---------------------------------------------------\nFilter        TSTART     TSTOP   Exposure       Mag\n---------------------------------------------------\nwhite (FC)      3398      3548        147     >21.2\n---------------------------------------------------\nv               3555      5191        393     >20.0\nb               4375      5990        372     >20.4\nu               4170      5806        393     >20.2\nuvw1            3965      5601        393     >20.3\nuvm2            3760      5396        393     >20.2\nuvw2            4787      4986        197     >20.1\nwhite           4580      4780        197     >21.4\n---------------------------------------------------\n\n    The quoted upper limits have not been corrected for the expected\nextinction due to the Galactic reddening along the line of sight to\nthis burst of E(B-V) = 0.05 mag (Schlafly et al. 2011, ApJS, 737,\n103).",
  "circularId": 15972,
  "createdOn": 1394652419000,
  "email": "sholland@stsci.edu",
  "subject": "GRB 140311B: Swift/UVOT Upper Limits",
  "submitter": "Stephen Holland at STScI  <sholland@stsci.edu>",
  "eventId": "GRB 140311B"
}