{
  "bibcode": "2015GCN.17617....1K",
  "body": "N. P. M. Kuin (UCL-MSSL) and Amaral-Rogers (U Leicester)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 150323A\n156 s after the BAT trigger (Amaral-Rogers et al., GCN Circ. 17611).\nA weak optical afterglow consistent with the XRT position (Goad et al.,\nGCN Circ. 17615) or the P60 position (GCN Circ. 17612) is be present\nin 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           156          306          147         20.53+/-0.30\nu_FC               314          564          246         >20.0\nwhite             4066         5702         1635         20.96+/-0.33\nv                 5912         6112          197         18.93+/-0.29\nu                  314         5291          442         >20.7\nu                 4991         5191          197         19.86+/-0.35\nw1                4887         5086          197         >20.2\nm2                4682         4881          197         >20.9\nw2                4272         4472          197         >20.4\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.03 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 17617,
  "createdOn": 1427110856000,
  "email": "npkuin@gmail.com",
  "subject": "GRB150323A: Swift-UVOT detection of the afterglow",
  "submitter": "Paul Kuin at MSSL  <npkuin@gmail.com>",
  "eventId": "GRB 150323A"
}