{
  "bibcode": "2022GCN.32390....1B",
  "body": "A.A. Breeveld (UCL-MSSL) and N. J. Klingler (GSFC/UMBC/CRESTII) report on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 220710A 242493 s after the GECAM/GUANO \ntrigger (Tohuvavohu et al., GCN Circ. 32375).\nNo optical afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 32385) is detected \nin the UVOT exposures.\nPreliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. \nProc. 1358, 373) for the initial exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite           242493       287404         4429         >22.9\n\nThe magnitudes in the table are not corrected for the Galactic extinction due to the reddening of \nE(B-V) = 0.030 in the direction of the burst (Schlegel et al. 1998).",
  "circularId": 32390,
  "createdOn": 1657780105000,
  "email": "a.breeveld@ucl.ac.uk",
  "subject": "GRB 220710A: Swift/UVOT Upper Limits",
  "submitter": "Alice Breeveld at MSSL-UCL  <a.breeveld@ucl.ac.uk>",
  "eventId": "GRB 220710A"
}