//////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1395 SUBJECT: IPN triangulation of GRB020525 DATE: 02/05/27 22:55:53 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley, on behalf of the Ulysses GRB team, E. Mazets and S. Golenetskii, on behalf of the Konus-Wind GRB team, I. Mitrofanov, D. Anfimov, A. Kozyrev, M. Litvak, and A. Sanin, on behalf of the HEND/Odyssey GRB team, W. Boynton, C. Fellows, K. Harshman, C. Shinohara, and R. Starr, on behalf of the GRS/Odyssey GRB team, and T. Cline, on behalf of the Ulysses, Konus, and MO GRB teams, report: Ulysses, Konus, and MO-HEND observed this burst at 20164 s. As observed by Ulysses, it had a duration of ~25 s, a 25-100 keV fluence of 1E-5 erg/cm^2, and a peak flux over 0.5 s of 8E-7 erg/cm^2 s. Triangulation gives a preliminary ~25 sq. arcmin. error box (3 sigma) whose coordinates are: 11 h 29 m 32.93 s -20 o 21 ' 05.28 " (CENTER) 11 h 29 m 28.52 s -20 o 23 ' 09.64 " (CORNER) 11 h 29 m 57.73 s -20 o 21 ' 44.51 " (CORNER) 11 h 29 m 8.15 s -20 o 20 ' 25.79 " (CORNER) 11 h 29 m 37.34 s -20 o 19 ' 00.91 " (CORNER) This error box may be improved. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1397 SUBJECT: GRB020525, optical observations DATE: 02/05/28 16:55:56 GMT FROM: Arne A. Henden at USNO/USRA A. Henden (USRA/USNO), on behalf of the USNOFS GRB team, and P. Nelson (Ellinbank Observatory, Victoria), on behalf of the AAVSO International GRB Network, report: We have observed the entire IPN error box for GRB020525 (Hurley et al., GCN 1395) using unfiltered exposures. The NOFS 1.0m observations were made at relatively high airmass, with scattered cirrus and full moon; the Ellinbank 0.3m observations had clear conditions but with full moon interference. This field is at galactic coordinates 278.1d longitude and 38.6d latitude and has several faint galaxies. Comparing with USNO-A and the USNO PMM scans of the southern R plate, we find no new objects to the plate limit. The log of observations: UTmid exp tel mlim 020528.178 9x5min 1.0m 22 020528.518 6x20min 0.3m 19 The brightest object not on the photographic plate is at 11:29:30.49 -20:18:41.9 J2000 but may be non-stellar. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1398 SUBJECT: GRB 020525: Optical Observations DATE: 02/05/28 19:01:55 GMT FROM: Daniel E. Reichart at U.Chicago/Astro M. Nysewander, L. Johnson, D. Moschler, J. Richuso, J. Rose (U. North Carolina), and D. Reichart (Caltech) report: We observed ~95% of the ~25 square arcminute error box of GRB 020525 (GCN 1395) with the 0.6-meter Morehead Observatory telescope beginning 2.95 days after the burst. We integrated without filter for 2460 seconds under poor observing conditions (scattered cirrus, relatively high air mass, and a nearly full moon). Visual comparison with the DSS reveals no transients down to our limiting magnitude, which we estimate to be V ~ 17 mag. This is consistent with the deeper searches of Henden et al. (GCN 1397).