{
  "bibcode": "2009GCN..9678....1B",
  "body": "A. Breeveld (MSSL/UCL) and L. Vetere (PSU)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 090715B\n53 s after the BAT trigger (Vetere et al., GCN Circ. 9668).\nThe optical afterglow reported in Vetere et al., GCN 9668 and  \nconfirmed by Smith et al., GCN 9670, Malesani et al., GCN 9671,  \nWiersema et al., GCN 9673 and Antonelli et al., GCN 9675 is detected  \nby the UVOT only in the initial white exposure. The detected magnitude  \nand preliminary 3-sigma upper limits obtained using a 3\" aperture and  \nthe UVOT photometric system\n(Poole et al. 2008, MNRAS, 383, 627) for the first finding chart (FC)\nexposure and subsequent summed exposures are:\n\nFilter         T_start(s)   T_stop(s)      Exp(s)         Mag\n\nwhite_FC         53            203          147         20.37 +/- 0.15\nwhite            4052         4252          196         >21.3\nv                    5989       22687          795         >21.0\nb                    3848         4047          197         >20.3\nu                      266       16495          428         >21.2\nw1              12053       16278          894         >21.2\nm2                6195       10367          826         >21.0\nw2                4258       22065          995         >21.4\n\nThe values quoted above are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.01 in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 9678,
  "createdOn": 1247747529000,
  "email": "aab@mssl.ucl.ac.uk",
  "subject": "GRB 090715B: Swift/UVOT followup observations",
  "submitter": "Alice Breeveld at MSSL-UCL  <aab@mssl.ucl.ac.uk>",
  "eventId": "GRB 090715B"
}