{
  "bibcode": "2019GCN.26128....1U",
  "body": "GRB 191031D: Swift/UVOT Upper Limits\n\nJ. D. Gropp (PSU) and V. D'Elia (SSDC)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 191031D\n93 s after the BAT trigger (D'Elia et al., GCN Circ. 26112).\nNo optical afterglow consistent with the XRT position\n(Osborne et al. GCN Circ. 26117)\nis detected in the initial UVOT exposures.\nPreliminary 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first\nfinding chart (FC) exposure and subsequent exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite_FC            93          242          147         >20.8\nu_FC               306          555          246         >20.2\nwhite               93         6694          575         >21.1\nv                  636         5863          294         >19.9\nb                  561         6683          471         >20.4\nu                  306         6477          697         >20.3\nw1                 686         6273          452         >19.8\nm2                 661         6067          294         >19.6\nw2                 612         5658          294         >19.9\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.08 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 26128,
  "createdOn": 1572627634000,
  "email": "sjl5346@psu.edu",
  "subject": "GRB 191031D: Swift/UVOT Upper Limits",
  "submitter": "Sam LaPorte at PSU  <sjl5346@psu.edu>",
  "eventId": "GRB 191031D"
}