{
  "bibcode": "2010GCN.10510....1O",
  "body": "S. R. Oates (MSSL-UCL) and M. Stamatikos (OSU/NASA/GSFC)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of\nGRB 100316C 81s after the BAT trigger (Stamatikos et al., GCN Circ. 10491).\nWe do not detect any source at the enhanced Swift XRT position\n(Evans et al. GCN Circ. 10506).\n\nThe 3-sigma upper limits for the finding chart exposures (FC)\nand summed images are:\n\nFilter   T_start   T_stop   Exp(s)  Mag (3-sigma upper limit)\n-------------------------------------------------------------\nwhite (FC)  81    231        147       > 20.52\nwhite       521   7450       677       > 21.63\nu     (FC)  239   489        246       > 19.87\nu           644   7039       529       > 20.22\nv           570   12991      1326      > 20.45\nb           495   7245       549       > 20.72\nuvw1        620   6834       333       > 20.24\nuvm2        595   13530      741       > 20.60\nuvw2        546   7656       471       > 20.57\n-------------------------------------------------------------\n\nThe quoted upper limits have not been corrected for the expected\nGalactic extinction along the line of sight of E_(B-V) = 0.04 mag.\nAll photometry is on the UVOT photometric system described in Poole et\nal. (2008, MNRAS, 383, 627).",
  "circularId": 10510,
  "createdOn": 1268769915000,
  "email": "msslba@googlemail.com",
  "subject": "GRB100316C: Swift/UVOT Upper Limits",
  "submitter": "Patricia Schady at MSSL/Swift  <msslba@googlemail.com>",
  "eventId": "GRB 100316C"
}