{
  "bibcode": "2022GCN.32201....1S",
  "body": "M. H. Siegel (PSU) and S. B. Cenko (GSFC)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 220611A\n153 s after the BAT trigger (Cenko et al., GCN Circ. 32191).\nNo optical afterglow consistent with the XRT position\n(Cenko et al. GCN Circ. 32191) 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           153          302          147         >19.5\nu_FC               311          561          246         >19.1\nwhite              153          926          245         >19.5\nv                  641          835           39         >17.0\nb                  566          759           39         >18.2\nu                  311          734          265         >19.1\nw1                 690          710           19         >17.7\nm2                 665          685           19         >17.9\nw2                 616          636           19         >18.7\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.033 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 32201,
  "createdOn": 1655312348000,
  "email": "mhs18@psu.edu",
  "subject": "GRB 220611A: Swift/UVOT Upper Limits",
  "submitter": "Mike Siegel at PSU/Swift MOC  <mhs18@psu.edu>",
  "eventId": "GRB 220611A"
}