{
  "bibcode": "1998GCN...117....1D",
  "body": "[GCN Operator's Note:  This is a redistribution of GCN 117 to correct\na typo in the original distribution.  See full explanation below.]\n\n\nGRB 980613:  Optical transient and its host galaxy\n\nS. G. Djorgovski, S. R. Kulkarni, and S. C. Odewahn (Caltech), and H. Ebeling\n(IfA, Hawaii) report on behalf of the Caltech GRB collaboration:\n\nFurther analysis of the Keck images of the field of GRB 980613 (see GCN 114),\ncalibrated with the Palomar 60-inch images (see GCN 105) gives the following\nresults:\n\nWe resolve the image of the optical transient (OT) found by Hjorth et al.\n(GCN 109) from its host galaxy, which extends up to 1.5 - 2 arcsec from\nthe point source (the OT) in approximate PA ~ 70 deg.\n\nMagnitudes of stars 1-5 from Diercks et al., GCN 108, in the Gunn r band are:\n\nARC star 1    r = 18.45   RA = 10 17 47.559  DEC = +71 27 00.75\nARC star 2    r = 19.59   RA = 10 17 54.828  DEC = +71 27 39.81\nARC star 3    r = 20.82\nARC star 4    r = 20.07\nARC star 5    r = 19.51   RA = 10 17 41.456  DEC = +71 28 09.11\n\nThe positions given are from the USNO A1.0 catalog where available (J2000).\nARC star 2 is identical to star 1 from Hjorth et al. (GCN 109).\n\nIn this system, the integrated magnitude of the optical transient (OT) plus\nits apparent host galaxy is:  r = 24.15 +- 0.3.  The total flux is divided\napproximately equally between the two.  Assuming the mean zero-point offset\n<r-R> = 0.4, this implies the magnitude for the OT at this epoch (June 16.30\nUT) of R = 24.5 +- 0.5 (and the same for the host galaxy).\n\nUsing the measurement of R = 22.9 +- 0.2 on June 13.9 UT from Hjorth et al.,\nthe implied power-law decay slope is -1.0, which is perfectly normal for\nGRB afterglows.\n\nImages are now posted at:\nhttp://astro.caltech.edu/~george/grb/grb980613.html\n\nThis message can be cited.\n\n\n\n[GCN Operator's Note: D. Djorgovski, et al., points out that there was a typo\nin their original submission to GCN Circular 117.  The text above is the\ncorrected version.\nThe original quoted the \"... its apparent host galaxy is:  r = 25.15 +- 0.3\",\nwhen it should have said \"... its apparent host galaxy is:  r = 24.15 +- 0.3.\"\nThis second distribution has been given the same serial number.  The archive\nfiles on the GCN web site have been corrected.]",
  "circularId": 117,
  "createdOn": 898298624000,
  "email": "george@oracle.caltech.edu",
  "subject": "GRB 980613:  Optical transient and its host galaxy",
  "submitter": "George Djorgovski at Caltech/Palomar  <george@oracle.caltech.edu>",
  "eventId": "GRB 980613"
}