{
  "submitter": "Samantha Oates at University of Birmingham <samantha.oates@alumni.ucl.ac.uk>",
  "circularId": 35777,
  "eventId": "GRB 240222A",
  "submittedHow": "email",
  "body": "S. R. Oates (Lancaster. U) and P. D'Avanzo (INAF-OAB) report on behalf of the\nSwift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 240222A\n98s after the BAT trigger (D'Avanzo et al., GCN Circ 35770). No optical\nafterglow consistent with X-ray (D'Avanzo et al., GCN Circ. 35770) position is\ndetected in the initial UVOT exposures.\n\nPreliminary 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite          98            1192          205            >20.9\nv              642           1068           58            >18.5\nb              567           1168           58            >19.5\nu              311           1142          285            >20.0\nuvw1           691           1118           39            >18.3\nuvm2           666           861            39            >18.0\nuvw2           617           1044           58            >18.6\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.16 in the direction of the burst\n(Schlegel et al. 1998).\n\n",
  "subject": "GRB 240222A: Swift/UVOT Upper Limits",
  "createdOn": 1708641299399,
  "bibcode": "2024GCN.35777....1O"
}