{
  "bibcode": "2014GCN.17085....1M",
  "body": "F. E. Marshall (NASA/GSFC) and A. Y. Lien (GSFC/UMBC)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 141121A\n371 s after the BAT trigger (Lien et al., GCN Circ. 17075).\nA source consistent with the optical position\n(Tanga et al. GCN Circ. 17078)\nis detected in the initial UVOT exposures.\n\nThe preliminary UVOT position is:\n   RA  (J2000) =  08:10:40.63 = 122.66928 (deg.)\n   Dec (J2000) =  22:13:02.2  =  22.21728 (deg.)\nwith an estimated uncertainty of 0.5 arcsec. (radius, 90% confidence).\n\nThe source shows an unusual light curve with little evidence for variability.\nThe source is detected in all UVOT filters although the detections in v and w2\nare not highly significant. Preliminary detections and 3-sigma upper limits \nusing 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              371          520          147        >20.1\nwhite             6067         6266          197         20.2 +/- 0.2\nv                  527          547           19        >18.3\nv                15373        16025          635         20.3 +/- 0.3\nb                 5862         6062          197         19.8 +/- 0.2\nu                 5562         5714          149         19.4 +/- 0.2\nu                27756        28325          556         19.3 +/- 0.1\nw1                3830         3897           66         19.4 +/- 0.3\nw1               26850        27750          886         19.7 +/- 0.1\nm2               21039        21939          886         20.4 +/- 0.2\nw2                9514        12083          771         21.2 +/- 0.3\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.05 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 17085,
  "createdOn": 1416596595000,
  "email": "femarsha@khamseen.gsfc.nasa.gov",
  "subject": "GRB 141121A: Swift/UVOT Detections",
  "submitter": "Frank Marshall at GSFC  <femarsha@khamseen.gsfc.nasa.gov>",
  "eventId": "GRB 141121A"
}