{
  "bibcode": "2017GCN.22004....1B",
  "body": "A. A. Breeveld (UCL-MSSL) 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 171010A\n69338 s after the LAT trigger (Omodei et al., GCN Circ. 21985).\nA afterglow (Thorstensen and Halpern, GCN Circ. 21987, Izzo and \nMalesani, GCN Circ. 21988, Guidorzi et al., GCN Circ. 21991, Malesani et \nal., GCN Circ. 22000, Harita et al., GCN Circ. 22001) is detected in the \ninitial UVOT exposures. However it is not possible to distinguish this \nsource from the position of the Pan-STARRS source given in Izzo and \nMalesani (GCN Circ. 21988). The source magnitude is not changing \nsignificantly within this observation.\n\nPreliminary detections using the UVOT photometric system (Breeveld et \nal. 2011, AIP Conf. Proc. 1358, 373) for the summed exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)           Mag\n\nwhite            69338        80991         4818         18.84 �� 0.02\n\nThe magnitudes in the table are not corrected for the Galactic \nextinction due to the reddening of E(B-V) = 0.15 in the direction of the \nburst (Schlegel et al. 1998).",
  "circularId": 22004,
  "createdOn": 1507814555000,
  "email": "a.breeveld@ucl.ac.uk",
  "subject": "GRB 171010A: Swift/UVOT Detection",
  "submitter": "Alice Breeveld at MSSL-UCL  <a.breeveld@ucl.ac.uk>",
  "eventId": "GRB 171010A"
}