{
  "subject": "GRB 240122A: Swift/UVOT Upper Limits",
  "submittedHow": "web",
  "body": "M. H. Siegel (PSU) and and V. D’Elia (SSDC & INAF-OAR) report on behalf of the\nSwift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 240122A\nfrom 29.5 ks to 35.6 ks after the MAXI trigger (Negoro et al., GCN Circ. 35593).\nNo optical afterglow consistent with either the optical (Kumar et al., GCN\nCirc. 35596) or X-ray (Ambrosi et al., GCN Circ. 3600) position is detected in the initial\nUVOT exposures. The lack of detection in the u-band would be consistent with the\nredshift of 3.162 given by Saccardi et al. (GCN Circ. 35599).\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 of\nthe candidate afterglow field are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nu                35166       35655          481         >20.4\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.064 in the direction of the burst\n(Schlegel et al. 1998).",
  "bibcode": "2024GCN.35613....1S",
  "circularId": 35613,
  "createdOn": 1706050677453,
  "eventId": "GRB 240122A",
  "submitter": "Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>"
}