{
  "bibcode": "2012GCN.13735....1B",
  "body": "A. A. Breeveld (MSSL-UCL) and S. Immler (CRESST/GSFC/UMD) report on \nbehalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 120909A\n3308 s after the BAT trigger (Immler et al., GCN Circ. 13727).\nA source consistent with the optical position (Sudilovsky et al. GCN \nCirc. 13729), is detected in the initial UVOT exposures.\n\nPreliminary detections and 3-sigma upper limits using the UVOT \nphotometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for \nthe early exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)           Mag\n\nwhite             3308         4690          344         20.75 � 0.20\nv                 3465        16690         1261        >20.2\nb                 4285        23216          937        >21.5\nu                 4080        22450         1848        >21.4\nw1                3875        21536         1968        >21.6\nm2                3670        17445         1820        >21.4\nw2                4696        15776         1082        >21.6\n\nThe magnitudes in the table are not corrected for the Galactic \nextinction due to the reddening of E(B-V) = 0.09 in the direction of the \nburst (Schlegel et al. 1998).",
  "circularId": 13735,
  "createdOn": 1347213739000,
  "email": "aab@mssl.ucl.ac.uk",
  "subject": "GRB 120909A: Swift/UVOT Detection",
  "submitter": "Alice Breeveld at MSSL-UCL  <aab@mssl.ucl.ac.uk>",
  "eventId": "GRB 120909A"
}