{
  "bibcode": "2016GCN.19168....1M",
  "body": "F. E. Marshall (NASA/GSFC) and A. Maselli (INAF/IASF)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 160310A\n40247 s after the LAT trigger (Vianello et al., GCN Circ. 19158).\nNo source is detected in the initial UVOT exposures\nat a position consistent with the position\nof the possible XRT afterglow (Gibson et al., GCN Circ. 19162)\nor the possible optical counterpart (Kruehler et al., GCN Circ. 19164).\nPreliminary 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nu                40247        46726         1273         >20.4\nwhite            41072        41890          805         >21.3\nv                41897        42757          843         >19.9\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.53 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 19168,
  "createdOn": 1457736475000,
  "email": "femarsha@khamseen.gsfc.nasa.gov",
  "subject": "GRB 160310A: Swift/UVOT Upper Limits",
  "submitter": "Frank Marshall at GSFC  <femarsha@khamseen.gsfc.nasa.gov>",
  "eventId": "GRB 160310A"
}