{
  "bibcode": "2019GCN.24945....1S",
  "body": "GRB 190630C: Swift/UVOT Upper Limits\n\nK. K. Simpson (PSU) and T. N. Ukwatta (LANL)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 190630C\n136 s after the BAT trigger (Ukwatta et al., GCN Circ. 24927).\nNo optical afterglow consistent with the XRT position\n(Goad et al. GCN Circ. 24930)\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 first\nfinding chart (FC) exposure and subsequent exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite_FC           157          307          147         >20.5\nwhite              157          307          147         >20.5\nv                  136          412           32         >18.1\nw2                 367          387           19         >20.1\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.11 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 24945,
  "createdOn": 1562009557000,
  "email": "kira.simpson1984@gmail.com",
  "subject": "GRB 190630C: Swift/UVOT Upper Limits",
  "submitter": "Kira Simpson at PSU  <kira.simpson1984@gmail.com>",
  "eventId": "GRB 190630C"
}