GCN Circular 6085
M.L. Conciatore, G. Stratta, M. Perri (ASDC), G. Sato (GSFC/ISAS) D. Burrows (PSU) report on behalf of the Swift/XRT team: We have analysed the first seven orbits of XRT data GRB070208. A 11.7 ks photon counting mode image provides a refined XRT position: RA(J2000) =13h 11m 32.73s, Dec(J2000) =+61d 57m 55.20s with an uncertainty of 3.7 arcsec (90% containment). This position is 0.3 arcsec from the XRT position quoted in Sato et el. (GCN Circ. 6074), 72 arcsec from the ground-calculated BAT position reported by Markwardt et al. (GCN Circ. 6081) and 1.7 arcsec from the fading source reported by Guidorzi et al. (GCN Circ. 6077; see also Fox et al., GCN Circ. 6078). The 0.3-10 keV X-ray light-curve, after an initial slow rising phase, shows a steep decay (alpha~-3.6) during the second orbit (from T+4.3ks to T+6.7ks). Starting from the third orbit, the light-curve shows a power-law decline with a decay index of 1.8+/-0.4. The X-ray spectrum is well fitted by an absorbed power-law with a photon index of 2.6 +/- 0.2 and column density of (2.6 +/-0.4 )e21 cm**-2. We note the Galactic column density in the direction of the source is 1.7e20 cm**-2. The 0.3-10 keV observed flux was 1.5e-12 ergs cm**-2 s**-1, which corresponds to an unabsorbed flux of 3.5e-12 ergs cm**-2 s**-1. If the burst continues decaying at the current rate we estimate an XRT count rate of 0.002 counts/s at T + 24hr, which corresponds to an observed 0.3-10 keV flux of 2.3e-13 ergs cm**-2 s**-1 This circular is an official product of the Swift XRT Team.