{
  "bibcode": "2009GCN..9048....1O",
  "body": "S. R. Oates (MSSL-UCL) reports on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began observing the field of GRB 090328 16 hrs\nafter the Fermi LAT trigger (McEnery et al., GCN 9044). We detect\na candidate optical afterglow in the u and white filters at:\n\nRA(J2000.0)  = 06:02:39.67\nDEC(J2000.0) = -41:52:54.5\n\nwith an estimated uncertainty of 0.6 arcsec (radius, 90% confidence).\nAt the moment we are unable to tell if the source is fading, further\nobservations have been performed, but due to a data gap, the data\nis currently unavaliable.\n\nPreliminary magnitudes for the white and u filters are:\n\nFilter    T_mid (hrs)  Exposure(s)       Mag  Err\n------------------------------------------------------------\nu         16.0         793           19.04 +/- 0.13\nwhite     16.1         173           19.56 +/- 0.14\n\nThe above magnitudes are not corrected for the Galactic extinction\ncorresponding to a reddening of E_{B-V} = 0.06 mag (Schlegel et al.,\n1998, ApJS, 500, 525).  The photometry is on the UVOT flight system\ndescribed in Poole et al. (2008, MNRAS, 383,627).",
  "circularId": 9048,
  "createdOn": 1238339480000,
  "email": "sro@mssl.ucl.ac.uk",
  "subject": "GRB 090328: Swift UVOT observations",
  "submitter": "Samantha Oates at MSSL  <sro@mssl.ucl.ac.uk>",
  "eventId": "GRB 090328"
}