{
  "bibcode": "2018GCN.23173....1S",
  "body": "GRB 180823A: Swift/UVOT Upper Limits\n\nS. Sebzda (PSU) and B. Sbarufatti (PSU)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 180823A\n381 s after the BAT trigger (Sbarufatti et al., GCN Circ. 23169).\nNo optical afterglow consistent with the XRT position\n(Goad et al. GCN Circ. 23170)\nis 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 initial exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite              381          417           36         >19.1\nwhite              381         4476          380         >20.9\nv                 4686        10356          927         >19.2\nb                 4071         4271          197         >19.7\nu                 3866         4066          197         >19.8\nm2               10361        10803          435         >19.8\nw2                4482         4681          197         >20.0\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.02 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 23173,
  "createdOn": 1535127982000,
  "email": "sjl5346@psu.edu",
  "subject": "GRB 180823A: Swift/UVOT Upper Limits",
  "submitter": "Sam LaPorte at PSU  <sjl5346@psu.edu>",
  "eventId": "GRB 180823A"
}