{
  "bibcode": "2005GCN..3468....1R",
  "body": "E.S. Rykoff (U Mich), S.A. Yost (U Mich), H. Swan (U Mich), R. Quimby (U \nTexas), report on behalf of the ROTSE collaboration:\n\nROTSE-IIIc, located at the H.E.S.S. site in Namibia, and ROTSE-IIId at \nthe Turkish National Observatory in Turkey responded automatically to \nSwift GRB 050525 (GCN 3466, 3467).  Our first 5-s exposure from \nROTSE-IIIc begain at 00:08:56.7 UT; the response in Turkey was delayed \napproximately 30 minutes due to bad weather.  The images in Namibia were \naffected by clouds passing through the images.\n\nWe confirm the fading nature of the afterglow reported in GCN 2465.  The \nafterglow is well detected in images from both ROTSE-IIIc and \nROTSE-IIId.  The afterglow is 9\" (3 pixels) from a 17.2 magnitude USNO \nstar, which affected our initial position estimate.  The revised \nposition is:\n\n    18:32:32.6   +26:20:23.5 (J2000)\n\nwith an uncertainty of ~1\".  We note that this is 7.2\" from the XRT \nposition reported by Band et al (GCN 2465).\n\nWe have measured the afterglow flux with our PSF fitting software and \nhave found that the early lightcurve is fading with a slow power-law \ndecline with index ~-0.5, with a peak of 15.1+/-0.1 at 601s post-burst. \n  The images are unfiltered and calibrated relative to USNO B1.0 R-band \nmagnitudes.  This bright afterglow with a slow decline should still be \nbright for follow-up spectroscopy.\n\nAn image of the afterglow and burst field from ROTSE-IIId is available at:\nhttp://www.rotse.net/grb_reports/050525_btab.html",
  "circularId": 3468,
  "createdOn": 1116994166000,
  "email": "erykoff@umich.edu",
  "subject": "GRB050525: ROTSE-III Refined Analysis",
  "submitter": "Eli Rykoff at U of Michigan/ROTSE  <erykoff@umich.edu>",
  "eventId": "GRB 050525"
}