{
  "eventId": "GRB 241128A",
  "body": "S.P.R. Shilling (Lancaster U.) and Brivio (INAF-OAB)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 241128A\n3880 s after the BAT trigger (Brivio et al., GCN Circ. 38367).\nNo optical afterglow consistent with the enhanced XRT position\n(Beardmore et al., GCN Circ. 38374) 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          3880         4029          147         >20.0\nwhite             3880         4649          344         >20.6\nv                 4860         5059          197         >19.0\nb                 4244         4444          197         >19.7\nu                 4038         4238          197         >19.2\nm2                5065        10054          534         >19.4\nw2                4655         4855          197         >19.3\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.067 in the direction of the burst\n(Schlegel et al. 1998).",
  "subject": "GRB 241128A: Swift/UVOT Upper Limits",
  "bibcode": "2024GCN.38422....1S",
  "circularId": 38422,
  "createdOn": 1733166695017,
  "submitter": "Sam Shilling at Lancaster University <shilling.sam@gmail.com>",
  "submittedHow": "web",
  "format": "text/plain"
}