{
  "bibcode": "2021GCN.30618....1L",
  "body": "GRB 210807A: Swift/UVOT Detection\n\nS. J. LaPorte (PSU) and A. Y. Lien (GSFC/UMBC)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 210807A\n210 s after the BAT trigger (Lien et al., GCN Circ. 30600).\nA source consistent with the XRT position\n(Lien et al. GCN Circ. 30600)\nis detected in the initial UVOT exposures.\n\nThe preliminary UVOT position is:\n    RA  (J2000) =  05:06:43.89 =  76.68289 (deg.)\n    Dec (J2000) = +58:14:59.2  =  58.24979 (deg.)\nwith an estimated uncertainty of 0.43 arc sec. (radius, 90% confidence).\n\nPreliminary detections and 3-sigma upper limits using the UVOT photometric\nsystem\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures\nare:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)           Mag\n\nb                        489            683            38        >17.84\nu                        639            659            19        >17.04\nv                        390            583            39\n16.58+-0.25\nuvw1                 440            633             38        >17.12\nuvw2                 539            721             26        >17.08\nwhite                 234            383           147\n16.93+-0.04\nwhite                 234            708           184          17.19+-0.05\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.409 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 30618,
  "createdOn": 1628456845000,
  "email": "sjl5346@psu.edu",
  "subject": "GRB 210807A: Swift/UVOT Detection",
  "submitter": "Sam LaPorte at PSU  <sjl5346@psu.edu>",
  "eventId": "GRB 210807A"
}