Gamma-ray Burst 001025B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN notice #865
  K. Hurley, on behalf of the Ulysses GRB team, T. Cline, on behalf of the Konus-Wind and NEAR GRB teams, and E. Mazets, and S. Golenetskii, on behalf of the KONUS-WIND GRB team, report:
  Ulysses, NEAR, and KONUS-WIND observed this GRB at 71369 seconds. As observed by Ulysses, it had a duration of < 0.25 seconds, a 25-100 keV fluence of approximately 2E-07 erg/cm2, and a peak flux of approximately 8E-07 erg/cm2 s over 0.25 seconds We have triangulated it to a preliminary, 3 sigma error whose approximate area is 110. sq. arcmin. and whose coordinates are:
  

      RA(2000)                              DEC(2000)
   ERROR BOX CENTER:   18 h 21 m 40.78 s     -5 o  8 '  34.45 " 
   ERROR BOX CORNER 1: 18 h 21 m 26.96 s     -5 o  8 '  54.58 " 
   ERROR BOX CORNER 2: 18 h 22 m 56.09 s     -5 o 22 '  40.46 " 
   ERROR BOX CORNER 3: 18 h 20 m 26.72 s     -4 o 54 '  38.26 " 
   ERROR BOX CORNER 4: 18 h 21 m 54.61 s     -5 o  8 '  14.39 " 
  

  The duration and energy spectrum of this event place it clearly in the short/hard category. We add one note of caution: this burst was detected by Ulysses with a significance of only 4.5 sigma (statistical), which is at the limit of a reliable detection.
  This error box may be improved
• GCN notice #868
  E. Berger (Caltech) and D. A. Frail (NRAO), report on behalf of a larger collaboration:
  Beginning on October 27.11 UT we observed the IPN error box of the short/hard burst, GRB001025B (GCN #865) with the VLA at 4.86 GHz. We find no new sources which are not cataloged in the NRAO VLA Sky Survey (NVSS), with a flux density larger than 0.7 mJy (5-6 sigma).
• GCN notice #870
  Alberto Castro-Tirado, IAA-CSIC (Granada) and LAEFF-INTA (Madrid), Manuel Alises, CAHA (Almeria), Jochen Greiner, AIP (Potsdam), on behalf of a larger collaboration, report:
  We have imaged the field of the short/hard GRB 001025b (Hurley et al., GCN 865) with the 2.2-m telescope at the German-Spanish Calar Alto Observatory. Several frames covering about 95% of this low- galactic latitude (4.4 deg) error box were obtained on Oct 27.85 UT, Oct 28.79 UT and Oct 29.78 UT (i.e. 24, 71 and 95 hours after the GRB). No objects varying by more than 0.3 mag are seen within the error box down to a limiting magnitude of I = 20.5.
• GCN notice #873
  H. Park (LLNL), G. Williams (UA), D. Perez, R. Nemiroff (MTU), S. Barthelmy (GSFC), D. Hartmann, C. Laver (Clemson), K Hurley (UCB) report on behalf of the Super-LOTIS collaboration:
  Super-LOTIS obtained images of the field around the short/hard burst GRB001025B (Hurley et al.,GCNC 865) with the 0.6-m Super-LOTIS telescope located at Kitt Peak, AZ on Oct 27.08 UT and 30.09 UT (30 and 102 hours after the burst) covering 100% of the IPN error box. The images were taken with 50 s integration time without a filter. A preliminary comparison of the two images revealed no new objects brighter than mV ~18.9 (10-sigma limit). Further analysis is in progress.