{
  "bibcode": "2019GCN.24568....1S",
  "body": "M. H. Siegel (PSU) and M. J. Moss (George Washington University)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 190515B\n93 s after the BAT trigger (Moss et al., GCN Circ. 24553).\nNo optical afterglow consistent with the XRT position\n(Osborne et al. GCN Circ. 24557)\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         >19.9\nu_FC               305          555          246         >19.4\nwhite               93          605          167         >20.0\nv                  636         4442          216         >18.9\nb                  561          754           39         >18.7\nu                  305          730          265         >19.5\nw1                 685         4722           88         >18.9\nm2                 661         4647          216         >19.6\nw2                 612         4237          216         >19.0\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.09 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 24568,
  "createdOn": 1558064692000,
  "email": "mhs18@psu.edu",
  "subject": "GRB 190515B: Swift/UVOT Upper Limits",
  "submitter": "Mike Siegel at PSU/Swift MOC  <mhs18@psu.edu>",
  "eventId": "GRB 190515B"
}