{
  "bibcode": "2008GCN..8606....1S",
  "body": "P. Schady (MSSL-UCL), F.E. Marshall (NASA/GSFC) and B. Sbarufatti  \n(INAF-IASF Pa) report on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began white band observations of the field of the Swift  \nBAT Slew Survey (BATSS) GRB 081203B 4.6 hrs after the BAT trigger  \n(Copete et al., GCN Circ. 8600, 8602). An uncatalogued, fading source  \nis clearly detected at\n\nRA(J2000.0)  =   15:15:11.67 (228.79863 deg)\nDEC(J2000.0) = +44:25:42.9 (44.42859 deg)\n\nwith an estimated uncertainty of 0.5 arcsec (radius, 90% confidence),  \nconsistent with the UVOT-enhanced XRT position (Sbarufatti et al., GCN  \nCirc. 8605).\n\nThe magnitudes of the first and last UVOT white band observations are  \nreported below:\n\nFilter    T_mid (s)   Exp (s)     Magnitude\nwhite       16746       154        18.29 +/- 0.04\nwhite       22270       441        18.70 +/- 0.03\n\nindicating a decay rate of alpha~1.0. The above magnitudes are not  \ncorrected for the Galactic extinction corresponding to a reddening of  \nE_{B-V} = 0.02 mag (Schlegel et al., 1998, ApJS, 500, 525).  The  \nphotometry is on the UVOT flight system described in Poole et al.  \n(2008, MNRAS, 383,627).",
  "circularId": 8606,
  "createdOn": 1228351047000,
  "email": "ps@mssl.ucl.ac.uk",
  "subject": "Swift/UVOT detection of GRB081203B",
  "submitter": "Patricia Schady at MSSL/Swift  <ps@mssl.ucl.ac.uk>",
  "eventId": "GRB 081203B"
}