{
  "bibcode": "2021GCN.30025....1B",
  "body": "A. Belles (PSU) 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 210514A\n80 s after the BAT trigger (Ambrosi et al., GCN Circ. 30008).\nNo optical afterglow consistent with the XRT position\n(Osborne et al., GCN Circ. 30011) is 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           80          229          147            >20.85\nu_FC                293          543          245            >20.12\nwhite               573         1366          225            >21.00\nv                      622         1415           97            >18.87\nb                     548         1342           77            >19.73\nu                     696         5458          210            >19.99\nw1                  672         5299          278            >19.59\nm2                  646         1440           97            >18.41\nw2                  598         1391           97            >18.52\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.022 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 30025,
  "createdOn": 1621177262000,
  "email": "aub1461@psu.edu",
  "subject": "GRB 210514A: Swift/UVOT Upper Limits",
  "submitter": "Alexander Belles at PSU/Swift  <aub1461@psu.edu>",
  "eventId": "GRB 210514A"
}