{
  "bibcode": "2020GCN.28613....1B",
  "body": "A. A. Breeveld (UCL-MSSL) and K. L. Page (U. Leicester)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 201013A 74 s after the BAT trigger \n(Page et al., GCN Circ. 28607).\nThere is a bright optical source (USNO B1.0 1470-0207304) 0.5 arcsec from the enhanced XRT position \n(Beardmore et al. GCN Circ. 28608). The magnitudes measured at this position by UVOT are consistent \nwith those catalogued and thus we do not detect any evidence of an afterglow candidate.\nPreliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. \nProc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite_FC            74          223          147         >16.8\nu_FC               286          535          246         >16.7\nwhite               74         1712          412         >16.8\nv                  616         1763          136         >16.2\nb                  541         1686          117         >16.6\nu                  286         1662          343         >16.7\nw1                 665         1804          127         >16.6\nm2                 640         1611           58         >16.7\nw2                 591         1738          136         >17.1\n\nThe magnitudes in the table are not corrected for the Galactic extinction due to the reddening of \nE(B-V) = 0.05 in the direction of the burst (Schlegel et al. 1998).",
  "circularId": 28613,
  "createdOn": 1602618074000,
  "email": "a.breeveld@ucl.ac.uk",
  "subject": "GRB 201013A: Swift/UVOT Upper Limits",
  "submitter": "Alice Breeveld at MSSL-UCL  <a.breeveld@ucl.ac.uk>",
  "eventId": "GRB 201013A"
}