{
  "bibcode": "2013GCN.15288....1B",
  "body": "A. A. Breeveld (UCL-MSSL), D. Grupe (PSU) and J. R. Cummings\n(UMBC/GSFC) report on behalf of the Swift team:\n\nThe Swift/UVOT began settled observations of the field of GRB 131001A\n79990 s after the BAT trigger (Cummings et al., GCN Circ. 15281).\nNo optical afterglow consistent with the BAT position (Cummings et al.,\nGCN Circ. 15281) 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 initial\nexposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nu                79990        86246          972         >20.94\n\nThe magnitudes in the table are not corrected for the Galactic\nextinction due to the reddening of E(B-V) = 0.03 in the direction of\nthe burst (Schlegel et al. 1998).\n\nThe Swift XRT observed the field of GRB 131001A for a total of 972s. \nNo source was found in the BAT error circle. The 3 sigma upper limit\nat the position of GRB 131001A applying the method described in Kraft\net al. (1991, ApJ, 374, 344) is 0.01 counts/s.\n\nThis circular is an official product of the Swift team.",
  "circularId": 15288,
  "createdOn": 1380735167000,
  "email": "dxg35@psu.edu",
  "subject": "GRB 131001A: Swift UVOT and XRT Upper Limits",
  "submitter": "Dirk Grupe at PSU/Swift-XRT  <dxg35@psu.edu>",
  "eventId": "GRB 131001A"
}