{
  "bibcode": "2021GCN.31222....1B",
  "body": "A. Belles (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 211211A\n92 s after the BAT trigger (D'Ai et al., GCN Circ. 31202).\nA fading source consistent with the XRT position\n(Beardmore et al. GCN Circ. 31205) and optical position\n(Zheng & Filippenko, GCN Circ. 31203) is detected in the initial\nUVOT exposures.\n\nPreliminary detections and 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)           Mag\nwh_FC               92          242          147      18.93+/-0.22\nwh                3906         4106          196      18.33+/-0.09\nwh               68215        68397          179            >19.74\nb                 3701         3901          196      18.97+/-0.28\nb                16837        17437          587      19.27+/-0.28\nb                67303        68210          885      19.70+/-0.24\nv                 4317         4517          196            >18.33\nu                 3496         5012          275      18.26+/-0.16\nu                15924        16831          885      18.44+/-0.11\nu                57177        74247          362            >18.89\nw1                4727         4927          196      17.46+/-0.16\nm2                4522         4721          196      17.58+/-0.19\nm2               21678        22153          467      18.18+/-0.18\nw2                4112         4312          196      17.30+/-0.15\nw2               61756        62656          885      18.94+/-0.24\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.018 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 31222,
  "createdOn": 1639333197000,
  "email": "aub1461@psu.edu",
  "subject": "GRB 211211A: Swift/UVOT detection",
  "submitter": "Alexander Belles at PSU/Swift  <aub1461@psu.edu>",
  "eventId": "GRB 211211A"
}