{
  "bibcode": "2020GCN.27783....1K",
  "body": "N. P. M. Kuin (UCL-MSSL) and P. A. Evans (U. Leicester)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 200522A\n448 s after the BAT trigger (Evans et al., GCN Circ. 27778).\nNo optical afterglow consistent with the XRT position\n(Evans et al. GCN Circ. 27778) is 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           448          598          147         >19.5\nwhite              448          598          147         >19.5\nv                  605          624           19         >17.2\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.03 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 27783,
  "createdOn": 1590183800000,
  "email": "npkuin@gmail.com",
  "subject": "GRB 200522A: Swift/UVOT Upper Limits",
  "submitter": "Paul Kuin at MSSL  <npkuin@gmail.com>",
  "eventId": "GRB 200522A"
}