{
  "bibcode": "2014GCN.17201....1M",
  "body": "F. E. Marshall (NASA/GSFC) and J. R. Cummings (NASA/UMBC)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 141220A\n597 s after the BAT trigger (Cummings et al., GCN Circ. 17196).\nThere were also other exposures when the spacecraft attitude\nwas not stable.\nA source consistent with the optical position\nGorosabel et al. (GCN Circ. 17197)\nis detected in the initial UVOT exposures.\n\nThe preliminary UVOT position is:\n    RA  (J2000) =  13:00:15.76 = 195.06565 (deg.)\n    Dec (J2000) = +32:08:47.0  =  32.14639 (deg.)\nwith an estimated uncertainty of 0.45 arc sec. (radius, 90% confidence).\n\nPreliminary detections 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\n\nwhite              597          617           19         17.30 � 0.07\nv                  647          839           39         17.65 � 0.16\nb                  573          593           20         17.58 � 0.13\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.01 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 17201,
  "createdOn": 1419091725000,
  "email": "femarsha@khamseen.gsfc.nasa.gov",
  "subject": "GRB 141220A: Swift/UVOT Detection",
  "submitter": "Frank Marshall at GSFC  <femarsha@khamseen.gsfc.nasa.gov>",
  "eventId": "GRB 141220A"
}