{
  "bibcode": "2018GCN.22827....1B",
  "body": "A. A. Breeveld (UCL-MSSL), P. A. Evans (U. Leicester) and M. De Pasquale \n(U. Instanbul) report on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 180620B 92 \ns after the BAT trigger (Evans et al., GCN Circ. 22807).\nA source consistent with the enhanced XRT position (Beardmore et al., \nGCN Circ. 22814) and the Grond position (Schweyer and Schady, GCN Circ. \n22819), and also detected by Izzo et al. (GCN Circ. 22823) is detected \nin the initial UVOT exposures in all filters except uvw2. The \nnon-detection in the uvw2 filter is consistent with the redshift of 1.12 \n(Izzo et al. GCN Circ. 22823).\n\nPreliminary detections and 3-sigma upper limits using the UVOT \nphotometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for \nthe early exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)           Mag\n\nwhite               92          242          147         18.06 �� 0.08\nv                  634          826           39         17.41 �� 0.22\nb                  559          579           20         17.56 �� 0.18\nu                  304          554          246         17.40 �� 0.09\nuvw1              9950        18219         1394         20.17 �� 0.2\nuvm2              6563        16382          804         20.6 �� 0.3\nuvw2              4256         4443          183         > 19.7\n\nThe magnitudes in the table are not corrected for the Galactic \nextinction due to the reddening of E(B-V) = 0.01 in the direction of the \nburst (Schlegel et al. 1998).",
  "circularId": 22827,
  "createdOn": 1529754249000,
  "email": "a.breeveld@ucl.ac.uk",
  "subject": "GRB 180620B: Swift/UVOT Detection",
  "submitter": "Alice Breeveld at MSSL-UCL  <a.breeveld@ucl.ac.uk>",
  "eventId": "GRB 180620B"
}