{
  "bibcode": "2009GCN..8990....1S",
  "body": "P.Schady (MSSL-UCL) S.T. Holland (CRESST/GSFC/USRA) and J. Mao (INAF-OAB) \nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began observing the field of GRB 0903013 once it came out \nof Moon constraint, 27ks after the BAT trigger (Mao et al., GCN Circ. \n8980). There is no afterglow detection in any of the b, u or uvw1 UVOT \nfilter observations taken at the optical afterglow position reported by \nChornock et al. (GCN 8979), although by coadding all filters into a single \nexposure, a source is marginally detected at the 2-sigma level.\n\nThe 3-sigma upper limits for GRB090313 within each UVOT filter are as \nfollows:\n\nFilter      T_mid(hrs)   Exp(s)  3-sig Mag UL\nu             7.98        223      > 20.81\nb             7.82        885      > 21.36\nuvw1          7.57        886      > 21.32\n\nwhere Tmid 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).",
  "circularId": 8990,
  "createdOn": 1236984645000,
  "email": "ps@mssl.ucl.ac.uk",
  "subject": "GRB 090313: Swift/UVOT upper limits",
  "submitter": "Patricia Schady at MSSL/Swift  <ps@mssl.ucl.ac.uk>",
  "eventId": "GRB 090313"
}