{
  "bibcode": "2004GCN..2649....1C",
  "body": "S. Campana and A. Moretti (INAF-Osservatorio di Brera) report:\n\n\"We analyzed the Chandra ACIS-S data of the XRF040812 (Gotz et al. 2004, \nGCN 2640) region. We carried out spectral analysis of the second source \n(CXOJ162602.3-444349) in the Patel et al. (2004, GCN 2648), the only one \nwith a sizable number of counts. The source is extremely hard with a \nphoton index of 0.1+\\-0.6 (90% confidence level), fixing the column \ndensity to the Galactic value of 5.3x10^21 cm-2. Leaving free the column \ndensity the error on the photon index increases to 0.1_(-1.0)^(+1.5). \nThis hard photon index is typical of GRB X-ray afterglows. The \nunabsorbed 0.5-10 keV source flux is 2.53E-13 erg cm-2 s-1. The \nfollowing Chandra observation  (August 22, 2004) will allow to assess \nthe afterglow nature of CXOJ162608.4-444125.\"\n\nWe acknowledge the extraordinary effort by the CXC in providing rapid \nprocessing of this challenging data-set, thereby enabling this report.\n\nThis message can be cited.",
  "circularId": 2649,
  "createdOn": 1092844659000,
  "email": "campana@merate.mi.astro.it",
  "subject": "XRF040812: possible afterglow",
  "submitter": "Sergio Campana at INAF-OAB  <campana@merate.mi.astro.it>"
}