{
  "bibcode": "2009GCN..9006....1S",
  "body": "P.Schady (MSSL-UCL), F.E.Marshall (NASA/GSFC) and J. Mao (INAF-OAB) report \non behalf of the Swift/UVOT team:\n\nFollowing on from GCN 8990 (Schady et al.), we report on Swift/UVOT \nobservations of GRB 090313 for all optical and ultraviolet filters. A \nfading source is detected in the v filter and marginally in the b-band \nfilter at a position consistent with the optical afterglow reported by \nChornock et al. (GCN 8979). These observations are in agreement with the \nspectroscopic redshift z=3.375 (Chornock et al., GCN 8994).\n\nThe magnitudes and 3-sigma upper limits for GRB 090313 within each \nco-added UVOT filter are as follows:\n\nFilter   T_mid (hrs)    Exp (s)   Mag/3-sigma UL\nv          11.0          551      20.10 +/- 0.30 (3.6 sigma)\nb          11.2          770      21.50 +/- 0.38 (2.8 sigma)\nu          8.1           1024     > 21.44\nuvw1       8.6           1771     > 21.78\nuvm2       9.3           886      > 21.22\nuvw2       10.9          886      > 21.58\n\nwhere T_mid is the weighted mean time of the observations. The values \nquoted above are not corrected for the Galactic extinction due to the \nreddening of E(B-V)  = 0.03 in the direction of the burst (Schlegel et al. \n1998). All photometry is on the UVOT photometry system described in Poole \net al. (2008, MNRAS, 383, 627).\n\nIn addition, we note an error in GCN 8990 (Schady et al.), where we \nmistakenly labelled the results for the u filter as b and vice versa.",
  "circularId": 9006,
  "createdOn": 1237236905000,
  "email": "ps@mssl.ucl.ac.uk",
  "subject": "Further Swift/UVOT observations of GRB 090313",
  "submitter": "Patricia Schady at MSSL/Swift  <ps@mssl.ucl.ac.uk>",
  "eventId": "GRB 090313"
}