{
  "bibcode": "2019GCN.24955....1S",
  "body": "M. H. Siegel (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 190701A\n145 s after the BAT trigger (Ukwatta et al., GCN Circ. 24934).\nNo optical afterglow consistent with the enhanced XRT position\n(Osborne et al. GCN Circ. 24940)\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           145          295          147         >20.3\nu_FC               303          553          246         >19.8\nwhite              145         6776          727         >21.2\nv                  629        11104          409         >19.3\nb                  559         6570          432         >20.6\nu                  303         6365          659         >20.6\nw1                 677         6160          432         >19.9\nm2                 652         5955          432         >19.3\nw2                 610        10926         1158         >20.2\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.59 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 24955,
  "createdOn": 1562019533000,
  "email": "mhs18@psu.edu",
  "subject": "GRB 190701A: Swift/UVOT Upper Limits",
  "submitter": "Mike Siegel at PSU/Swift MOC  <mhs18@psu.edu>",
  "eventId": "GRB 190701A"
}