{
  "bibcode": "2008GCN..7578....1S",
  "body": "R.L.C. Starling, P.A. Evans, K.L. Page (U. Leicester) and S.T. Holland \n(CRESST/USRA/GSFC) report, on behalf of the Swift XRT team:\n\nWe have analysed the first three orbits of Swift XRT data (5.8 ks of data \nfrom T0+96s to T0+1.29e4s) for GRB 080409 (Holland et al., GCN Circ. \n7573). The enhanced position for the X-ray afterglow is given in Evans et \nal. (GCN Circ. 7575).\n\nThe light curve shows an initial increase with slope of alpha1~0.6 up to\nT~480s. The light curve then turns over to decay with a slope of\nalpha2=-0.8+/-0.1.  \n\nThe Photon Counting mode spectrum collected from the first three orbits \ncan be fit with an absorbed power law of photon index Gamma=2.2+0.5/-0.7 \nand a total absorbing column of NH=(5 +5/-4)e21 cm-2, exceeding the \nGalactic value of 2.4e21 cm-2. The 0.3-10 keV observed (unabsorbed) flux \nis 3.2e-12 (6.7e-12) erg/cm2/s, corresponding to a count rate of 5.8e-2 \ncount/s and a count rate to flux conversion of 1 count/s = 5.6e-11 erg/cm2/s.\n\nThe predicted count rates at T0+24h and T0+48h are 6.8e-3 and 4.0e-3 \ncount/s respectively, assuming the decay continues with alpha=-0.8.\n\nThis is an official product of the Swift XRT team.",
  "circularId": 7578,
  "createdOn": 1207742034000,
  "email": "rlcs1@star.le.ac.uk",
  "subject": "GRB 080409: Swift XRT refined analysis",
  "submitter": "Rhaana Starling at U of Leicester  <rlcs1@star.le.ac.uk>",
  "eventId": "GRB 080409"
}