{
  "format": "text/plain",
  "createdOn": 1722908151078,
  "eventId": "GRB 240805B",
  "submitter": "Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>",
  "bibcode": "2024GCN.37057....1S",
  "circularId": 37057,
  "body": "M. H. Siegel (PSU) and M. Williams (PSU)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 240805B\n88 s after the BAT trigger (Williams et al., GCN Circ. 37043).\nNo optical afterglow consistent with the XRT position\n(Goad et al., GCN Circ. 37053) is 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            88          238          147         >20.9\nu_FC               301          551          246         >19.9\nwhite               88         1719          411         >21.6\nv                  630         1768          136         >19.4\nb                  556         1694          117         >19.7\nu                  301         1669          343         >20.2\nw1                 679         1818          136         >19.6\nm2                1256         1620           39         >19.2\nw2                 606         1744          136         >20.1\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.087 in the direction of the burst\n(Schlegel et al. 1998).",
  "subject": "GRB 240805B: Swift/UVOT Upper Limits",
  "submittedHow": "web"
}