{
  "bibcode": "1998GCN...105....1O",
  "body": "S. Odewahn, C. Thomas, S. Djorgovski and S. Kulkarni report that\nthe  optical counterpart to GRB980613 detected by BeppoSAX was\nsearched for with the Palomar 60\" on Jun15,98 and Jun16,98 (UT).\nImages were obtained with CCD13 in Gunn gri at an airmass of 1.6\nand integration times of (900,600,600) seconds respectively under\nphotometric conditions and seeing measured at 1.0\" fwhm. Images and\ndetails of observations are given in:\n\n  http://astro.caltech.edu/~sco/sco1/research/grb/grb980613.html\n\n  The faintest source shown in our map at r=20.96 (object 6 in Fig1) is\ndetected at better than 5-sigma.  No such source (r<21) has been found\nto vary in the MECS error box with delta mag greater than 0.5 mags in\nthe period from Jun15,98 to Jun1698 (UT).  In Figure 2 of our web page\nwe show the Jun15 and Jun16 (UT) 600 second r images from the Palomar 60\"\nwith the latest position and errorbox from the L. Piro (MECS).  The 8'\ndiameter error box is centered on 10:17:45.6 +71:29:56.0 (J2000). The\nJun16 image is shifted into the coordinate system of the Jun15 image. We\nalso show for comparison the corresponding DSS field. A more thorough\nphotometric analysis of the our images will be reported following the\ncompletion of our Palomar observing run (Jun18,98).\n\n\n\n[GCN Operator's Note:  This circular was received at 10:44 UT, but due to\na computer network problem at GSFC its distribution was delayed until now.\nGSFC and GCN apologize for the delay.]",
  "circularId": 105,
  "createdOn": 898002062000,
  "email": "sco@astro.caltech.edu",
  "subject": "GRB980613 observations from Palomar",
  "submitter": "Steve Odewahn at Caltech  <sco@astro.caltech.edu>",
  "eventId": "GRB 980613"
}