{
  "bibcode": "2021GCN.30039....1L",
  "body": "GRB 210515C: Swift/UVOT Upper Limits\n\nS. J. LaPorte (PSU) and A. D'Ai (INAF-IASFPA)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 210515C\n40 s after the BAT trigger (A. D'Ai et al., GCN Circ. 30020).\nNo optical afterglow consistent with the XRT position\n(Osborne et al. GCN Circ. 30023)\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\nb                      486            851            58      >18.60\nuvm2                758           5041         216       >18.99\nu                      231           5285         311       >19.33\nv                      561           4836         235       >18.60\nuvw1                610           5246         235        >18.89\nuvw2              4432           4631         196        >18.90\nwhite                 72             942         271        >20.12\n\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.011 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 30039,
  "createdOn": 1621272931000,
  "email": "sjl5346@psu.edu",
  "subject": "GRB 210515C: Swift/UVOT Upper Limits",
  "submitter": "Sam LaPorte at PSU  <sjl5346@psu.edu>",
  "eventId": "GRB 210515C"
}