{
  "bibcode": "2014GCN.16013....1P",
  "body": "C. Pagani, K.L. Page, R.L.C. Starling, (U. Leicester) report on behalf \nof the Swift-XRT team:\n\nWe have analysed 4 ks of XRT data for the INTEGRAL detected GRB 140320B \n(Mereghetti et al. GCN Circ. 16004), from 11.6 s to 23.1 ks after the \ntrigger. The data are entirely in Photon Counting (PC) mode. An \nuncatalogued, fading X-ray source is detected inside the INTEGRAL error \ncircle.\n\nUsing 3683 s of XRT PC data and 4 UVOT images, we find an \nastrometrically corrected X-ray position (using the XRT-UVOT alignment \nand matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = \n145.55932, 60.26822 which is equivalent to:\n\nRA (J2000):  09 42 14.24\nDec (J2000): +60 16 05.6\n\nwith an uncertainty of 1.7 arcsec (radius, 90% confidence). This is \nconsistent with the optical position reported by Guidorzi et al. (GCN \n16003) and Elenin et al. (GCN 16005).\n\nThe light curve can be modelled with a power-law decay with an index of \nalpha=1.12 (+1.21, -0.05).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed \npower-law with a photon spectral index of 2.3 (+0.4, -0.3). The \nbest-fitting absorption column is  6 (+8, -6) x 10^20 cm^-2, consistent \nwith the Galactic value of 2.4 x 10^20 cm^-2 (Kalberla et al. 2005). The \ncounts to observed (unabsorbed) 0.3-10 keV flux conversion factor \ndeduced from this spectrum  is 2.8 x 10^-11 (3.0 x 10^-11) erg cm^-2 \ncount^-1.\n\nIf the light curve continues to decay with a power-law decay index of \n1.12, the count rate at T+24 hours will be 7.8 x 10^-3 count s^-1, \ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.2 x \n10^-14 (2.3 x 10^-14) erg cm^-2 s^-1.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 16013,
  "createdOn": 1395352651000,
  "email": "cp232@star.le.ac.uk",
  "subject": "GRB 140320B: Swift-XRT detection of the afterglow",
  "submitter": "Claudio Pagani at U of Leicester  <cp232@star.le.ac.uk>",
  "eventId": "GRB 140320B"
}