{
  "bibcode": "2020GCN.28222....1M",
  "body": "F. E. Marshall (NASA/GSFC) and E. Ambrosi (INAF-IASFPA)\r\nreport on behalf of the Swift/UVOT team:\r\n\r\nThe Swift/UVOT began settled observations of the field of GRB 200806A\r\n86 s after the BAT trigger (Ambrosi et al., GCN Circ. 28211).\r\nA source consistent with the enhanced XRT position\r\n(Beardmore et al. GCN Circ. 28214)\r\nis marginally detected in the initial UVOT exposures.\r\n\r\nThe preliminary detection and 3-sigma upper limits using the UVOT photometric system\r\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:\r\n\r\nFilter         T_start(s)   T_stop(s)      Exp(s)           Mag\r\n\r\nwhite               86          236          147         20.26 +/- 0.28\r\nv                  629          821           39        >17.9\r\nb                  555          747           39        >19.3\r\nu                  300          722          265        >19.5\r\nw1                 678          870           39        >18.8\r\nm2                 653          845           39        >19.4\r\nw2                 604         1052           58        >19.0\r\n\r\nThe magnitudes in the table are not corrected for the Galactic extinction\r\ndue to the reddening of E(B-V) = 0.42 in the direction of the burst\r\n(Schlegel et al. 1998).",
  "circularId": 28222,
  "createdOn": 1596821879000,
  "email": "marshall@milkyway.gsfc.nasa.gov",
  "subject": "GRB 200806A: Swift/UVOT Possible Detection",
  "submitter": "Frank Marshall at Swift/UVOT  <marshall@milkyway.gsfc.nasa.gov>",
  "eventId": "GRB 200806A"
}