{
  "bibcode": "2022GCN.32354....1B",
  "body": "A. Belles (PSU) and V. D'Elia (SSDC & INAF-OAR)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 220708A\n2473 s after the BAT trigger (D'Elia et al., GCN Circ. 32343).\nNo optical afterglow consistent with the XRT position\n(Osborne et al. GCN Circ. 32347)\nis detected in the initial UVOT exposures.\nPreliminary 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first\nfinding chart (FC) exposure and subsequent exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite_FC          2473         2622          147         >19.8\nwhite             2473         8325          402         >20.2\nv                 2934         3134          197         >18.9\nb                 2680         3954          216         >20.1\nu                 2655         3749          216         >19.9\nw1                2630         3544          216         >19.3\nm2                3139         3339          197         >19.3\nw2                2730         2930          197         >19.5\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.169 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 32354,
  "createdOn": 1657335698000,
  "email": "aub1461@psu.edu",
  "subject": "GRB 220708A: Swift/UVOT Upper Limits",
  "submitter": "Alexander Belles at PSU/Swift  <aub1461@psu.edu>",
  "eventId": "GRB 220708A"
}