{
  "bibcode": "1998GCN...155....1P",
  "body": "GRB980425: revised SAX-NFI positions\n\nL. Piro, IAS/CNR, Rome, Italy, R.C. Butler, ASI, Rome, Italy, F. Fiore, A.\nAntonelli, BeppoSAX SDC, Roma, E. Pian, ITesre, Bologna, Italy, report: \n\nThe majority of BeppoSAX observations were performed with the star tracker\nZ (i.e., the one co-aligned with the NFI) in the attitude control loop.\nHowever, a few observations could not be performed in this configuration,\nbut had to be carried out with the X and Y star trackers only.  We have\nfound out that, in these very infrequent cases, the attitude\nreconstruction could have an error of up to 3'.  This problem does not\naffect observations accomplished after May 5, 1998.  Prior to this date,\nthe only GRB which was observed by the NFI in this configuration is\nGB980425.  The revised coordinates (equinox 2000.0) of the two sources\nfound in the WFC error box (Pian et al., GCN 61) are:\n1SAXJ1935.0-5248, RA = 19h35m05.9s, Dec =-52o50'03\";  \n1SAXJ1935.3-5252, RA = 19h35m22.9s, Dec =-52o53'49\",\nwith a conservative error radius of 1.5'.  Both updated positions are\nstill within the WFC error box (Soffitta et al., IAU Circ. No. 6884). \nHowever, 1SAXJ1935.0-5248 is at 50\" from SN1998bw (Galama et al. 1998,\nNature, in press, astro-ph/9806175;  Kulkarni et al., Nature, in press,\nastro-ph/9807001) and therefore consistent with it, while the variable\nsource 1SAXJ1935.3-5252 is 3' away, i.e., inconsistent.",
  "circularId": 155,
  "createdOn": 908918763000,
  "email": "saxsci@ias.rm.cnr.it",
  "subject": "GRB980425: X-ray revised positions",
  "submitter": "SAX Science Operations at IAS/CNR Frascati  <saxsci@ias.rm.cnr.it>",
  "eventId": "GRB 980425"
}