{
  "circularId": 37919,
  "submitter": "noelklin@umbc.edu",
  "createdOn": 1730078908844,
  "eventId": "GRB 241025A",
  "submittedHow": "web",
  "bibcode": "2024GCN.37919....1K",
  "subject": "GRB 241025A: Swift/UVOT Detection",
  "format": "text/plain",
  "body": "N. J. Klingler (GSFC/UMBC/CRESTII) and E. Ambrosi (INAF-IASFPA)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 241025A\n126 s after the BAT trigger (Ambrosi et al., GCN Circ. 37859).\nA source consistent with the XRT position (Evans et al.; GCN Circ. 37868) \nis detected in the initial UVOT exposures.\n\nThe preliminary UVOT position is:\n    RA  (J2000) =  22:14:36.83 = 333.65346 (deg.)\n    Dec (J2000) = +83:34:32.2  =  83.57562 (deg.)\nwith an estimated uncertainty of 0.43 arc sec. (radius, 90% confidence).\n\nPreliminary detections and 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are: \n\nFilter         T_start(s)   T_stop(s)      Exp(s)           Mag\n\nwhite              126          275          147         17.55 +/- 0.04\nv                  671         5229          274        >19.4\nb                  595         1347           78        >20.2\nu                  339         1322          304        >20.5\nw1                 722         5483          101        >21.0\nm2                5234         5434          197        >20.2\nw2                1030         1050           19        >19.5\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.249 in the direction of the burst\n(Schlegel et al. 1998)."
}