{
  "bibcode": "2009GCN..9527....1S",
  "body": "P. Schady (MSSL-UCL) reports on behalf of��the Swift UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 090618 129s \nafter the BAT trigger (Schady et al., GCN Circ. 9512) and a \ndecaying��source is detected in all UVOT filters at the position reported \nin Schady et al. (GCN Circ. 9512), consistent with refined XRT error \ncircle��(Evans et al., GCN Circ. 9521) as well as the optical afterglow \nposition reported in a number of other GCNs (GCN Circ. 9512, 9514, 9515). \nThe detection of the afterglow of GRB 090618 in all filters puts��an upper \nlimit on the redshift��of z < 1.7, consistent with the redshift constraints \nreported by Cenko et al. (GCN Circ. 9518).\n\nThe magnitudes for the first UVOT observation of GRB 090618 in each filter \nare as follows:\n\nFilter  T_start(s)  T_stop(s)  Exp(s)      Mag\nwhite      129        279       147    14.27+/-0.01\nv          671        691       19     15.60+/-0.09\nb          596        616       19     15.92+/-0.06\nu          340        590       246    14.62+/-0.01\nuvw1       720        740       19     15.09+/-0.08\nuvm2       695        715       19     15.23+/-0.12\nuvw2       647        667       19     15.27+/-0.10\n\nThe values quoted above are not corrected for the Galactic extinction due \nto the reddening of E(B-V) = 0.09 in the direction of the burst \n(Schlegel��et al. 1998). The photometry is on the UVOT photometric system \ndescribed��in Poole et al. (2008, MNRAS, 383, 627).",
  "circularId": 9527,
  "createdOn": 1245351610000,
  "email": "ps@mssl.ucl.ac.uk",
  "subject": "GRB090618: Swift/UVOT bright afterglow detection",
  "submitter": "Patricia Schady at MSSL/Swift  <ps@mssl.ucl.ac.uk>",
  "eventId": "GRB 090618"
}