{
  "bibcode": "2020GCN.27944....1M",
  "body": "F. E. Marshall (NASA/GSFC)\r\nreports on behalf of the Swift/UVOT team:\r\n\r\nThe Swift/UVOT began settled observations of the field of GRB 200613A\r\n43621 s after the FERMI/LAT trigger (Ohno et al., GCN Circ. 27931).\r\nA source consistent with the XRT position (Kennea et al., GCN Circ. 27936)\r\nis detected in the initial UVOT exposures.\r\n\r\nThe preliminary UVOT position is:\r\n    RA  (J2000) =  10:12:10.03 = 153.04178 (deg.)\r\n    Dec (J2000) = +45:45:14.1  =  45.75391 (deg.)\r\nwith an estimated uncertainty of 0.46 arc sec. (radius, 90% confidence).\r\nThis position is consistent with the optical counterparts\r\nreported by Kann et al. (GCN Circ. 27935 & 27938) and\r\nPozanenko (GCN Circ. 27937).\r\n\r\nPreliminary detections 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            44416        45204         775         19.65 +/- 0.07\r\nv                45211        45427         213        >18.6\r\nu                43621        44409         775         19.02 +/- 0.12\r\n\r\nThe magnitudes in the table are not corrected for the Galactic extinction\r\ndue to the reddening of E(B-V) = 0.01 in the direction of the burst\r\n(Schlegel et al. 1998).",
  "circularId": 27944,
  "createdOn": 1592154162000,
  "email": "marshall@milkyway.gsfc.nasa.gov",
  "subject": "GRB 200613A: Swift/UVOT Detection",
  "submitter": "Frank Marshall at Swift/UVOT  <marshall@milkyway.gsfc.nasa.gov>",
  "eventId": "GRB 200613A"
}