{
  "bibcode": "1998GCN....69....1P",
  "body": "GRB980425\n\n\nE. Pian, F. Frontera, Istituto TESRE, CNR, Bologna, Italy, \nL.A. Antonelli, SAX-SDC, Rome, Italy, L. Piro, IAS, CNR, Rome, Italy, \nalso on behalf of the BeppoSAX team\n\nreport:  \"A second Target-of-Opportunity observation of the BeppoSAX Wide\nField Camera (WFC) error box of GRB980425 (IAUC 6884) was done with the\nBeppoSAX Narrow Field Instruments (NFI) in May 2.604-3.646 UT. Preliminary\nanalysis of the MECS data shows that the source 1SAXJ1935.0-5248 reported in\nGCN N. 61 has a count rate of (3.0 +- 0.5)x10E-3 cts/s in the 1.6-10 keV range\n(1.9x10E-13 erg sE-1 cmE-2 in 2-10 keV), and therefore has decreased only with\nmarginal significance with respect to the TOO observation performed in April\n26.31-28.16 UT.  A 3-sigma upper limit of 1.5x10E-3 cts/s in the 1.6-10 keV\nrange is found for 1SAXJ1935.3-5252.  If one assumes for the X-ray emission of\nthis source a power-law temporal decay f ~ (t - t0)^{-alpha}, the measured\nupper limit is consistent with the alpha >0.4 fading observed between the\nfirst and second part of the first TOO NFI pointing (GCN N. 61), as well as\nwith the alpha ~1.4 decrease between the 2-10 keV flux preliminarily estimated\nfrom the WFC detection (~2.6x10E-08 erg sE-1 cmE-2, Pian et al. 1998, in\npreparation) and that observed in the first 27.7 hours of the first NFI\npointing (GCN N. 61). This variability behavior is typical of X-ray afterglows\nof GRBs so far detected.",
  "circularId": 69,
  "createdOn": 894981481000,
  "email": "pian@tesre.bo.cnr.it",
  "subject": "BSAX Observations of GRB980425 field",
  "submitter": "Elena Pian at ITESRE-CNR,Bologna  <pian@tesre.bo.cnr.it>",
  "eventId": "GRB 980425"
}