{
  "createdOn": 1792417333875,
  "submitter": "Paul Kuin at MSSL <npkuin@gmail.com>",
  "circularId": 45988,
  "subject": "GRB 261017A: Possible Swift/UVOT Detection",
  "submittedHow": "email",
  "body": "N.P.M. Kuin, A.A. Breeveld, M.J. Page (MSSL/UCL) and M. H. Siegel (PSU)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 261017A\n90 s after the BAT trigger (Siegel et al., GCN Circ. 45974).\nA source consistent with the XRT position (Beardmore et al.,GCN Circ. 45977)\nis detected in the initial UVOT exposures.\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\nwhite               90         1377          373         20.41 +/- 0.24\nv                  631         1427           97        >18.6\nb                  557         5666          198        >19.2\nu                  302         5538          501        >19.2\nw1                 680         1304           78        >18.5\n\nThe source varies between exposures, is sometimes absent, and\nappears double in two images. It might not be a point source.\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.023 in the direction of the burst\n(Schlegel et al. 1998).\n",
  "eventId": "GRB 261017A"
}