//////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 861 SUBJECT: ASM Localization of GRB 001025 DATE: 00/10/25 21:19:27 GMT FROM: Don Smith at MIT D. A. Smith (UMich), A. M. Levine, and R. Remillard (MIT), on behalf of the RXTE/ASM teams at MIT and NASA/GSFC, and and K. Hurley (UCB) and T. Cline (NASA/GSFC) on behalf of the NEAR GRB team, report: The RXTE All-Sky Monitor has detected a gamma-ray burst, beginning at about 03:10:05 UTC on 25 Oct 2000. As recorded by the ASM, the light curve consists of a single peak, lasting approximately 15-20 seconds. The event was hard, as measured in the ASM, reaching a peak 5-12 keV flux of ~4 Crab, and a 1.5-3 keV flux of ~1.5 Crab. It was detected in a single camera, yielding an error box with a length of 1.6 degrees and a width of 4.0 arcminutes. The center of the error box is at R.A. = 8h38m, Decl. = -13o16'.0 (J2000.0). The corners of the box are at the locations: 130.2309d {08h40m55s} -13.6681d {-13o40'05"} 130.2542d {08h41m01s} -13.6247d {-13o37'29"} 128.7598d {08h35m02s} -12.8590d {-12o51'32"} 128.7357d {08h34m57s} -12.9034d {-12o54'12"} NEAR also observed this burst. As observed by NEAR, in the energy range >~100 keV, and with 1 s resolution, the burst consisted of a single one second long spike followed by weak emission for ~5 seconds. A very coarse comparison of the NEAR and RXTE times gives an annulus which contains, but does not improve upon the ASM error box. Data from the Konus-Wind and/or Ulysses experiments will be available around 0600 UT on the 26th, and should result in a small RXTE/IPN error box. See the web page at http://xte.mit.edu/grb001025/ for figures and further developments. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 863 SUBJECT: IPN triangulation of GRB001025 DATE: 00/10/26 06:19:32 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley and T. Cline, on behalf of the Ulysses and NEAR GRB teams, and D. Smith, on behalf of the RXTE ASM GRB team, report: Ulysses and NEAR observed this burst (GCN #861). As observed by Ulysses, it had a duration ~5 s, a 25-100 keV fluence of ~3.2E-06 erg/cm^2, and a peak flux over 0.5 s of 2.0E-06 erg/cm^2 s. Using the RXTE ASM error box and the IPN annulus, we derive an ~25 sq. armin. error box (3 sigma) whose coordinates are: RA(2000) DEC(2000) 08 h 36 m 36.5 s -13 o 04 ' 30 " (CENTER) 08 h 36 m 41.9 s -13 o 07 ' 00 " (CORNER) 08 h 36 m 54.3 s -13 o 05 ' 00 " (CORNER) 08 h 36 m 30.5 s -13 o 02 ' 00 " (CORNER) 08 h 36 m 19.5 s -13 o 04 ' 00 " (CORNER) This error box may be improved. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 864 SUBJECT: CORRECTION TO IPN/RXTE ERROR BOX FOR GRB001025 DATE: 00/10/26 16:24:58 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley reports: There was an error of about 1' in the coordinates cited in GCN 863. The coordinates of the IPN/RXTE error box should have been RA(2000) DEC(2000) 08 h 36 m 34.7 s -13 o 05 ' 03 " (CENTER) 08 h 36 m 40.8 s -13 o 07 ' 30 " (CORNER) 08 h 36 m 53.3 s -13 o 05 ' 46 " (CORNER) 08 h 36 m 28.8 s -13 o 02 ' 35 " (CORNER) 08 h 36 m 16.1 s -13 o 04 ' 20 " (CORNER) I regret any confusion this may have caused, but I do have a good excuse (jet lag). //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 865 SUBJECT: IPN TRIANGULATION OF GRB001025B (SHORT/HARD) DATE: 00/10/27 00:40:45 GMT FROM: Kevin Hurley at UCBerkeley/SSL 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 //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 866 SUBJECT: GRB 001025A, optical observation DATE: 00/10/27 15:14:52 GMT FROM: Taichi Kato at Kyoto U M. Uemura, T. Kato, R. Ishioka, H. Iwamatsu (Kyoto Univ.) and H. Yamaoka (Kyushu Univ.) report on behalf of VSNET-grb collaboration: "We have observed the error box of GRB 001025A (Hurley et al., GCN #863, #864) with 8 x 300s R band exposures with the 60-cm RC telescope at Ouda station starting Oct. 26.79 UT. Due to the bad weather, the limiting magnitude was mag about 18.0. Comparing with Digital Sky Survey 2nd generation R image, no new object has not detected within the error box. Further observation is planned to be carried out tonight." This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 867 SUBJECT: GRB 001025 Optical Observations DATE: 00/10/27 20:00:49 GMT FROM: Holger Pedersen at Copenhagen U Obs GRB 001025: Optical observations J. P. U. Fynbo, P. Moller (ESO, Garching), B. Milvang-Jensen (U. of Nottingham), I. Burud (U. of Liege), M. I. Andersen (U. of Oulu), H. Pedersen, B. L. Jensen, J. Hjorth (U. of Copenhagen), and J. Gorosabel (DSRI, Copenhagen), on behalf of a larger collaboration report: "We have obtained images covering the error box of GRB 001025 (Smith et al., GCN #861; Hurley et al., GCNs #863, 864) with the 1.54-m Danish Telescope (+DFOSC) on La Silla, the 8.2-m Antu (VLT UT1) (+FORS1) on Paranal, and the 2.56-m Nordic Optical Telescope (NOT) (+ALFOSC) on La Palma, as follows: Start (UT) Tel. Filter Exp.time Seeing Lim.Mag =================================================== Oct. 26.29 Dk-1.5m R 3x300s 1.4" ~22.5 Oct. 26.34 Antu R 10x200s 0.8" ~24.5 Oct. 27.20 NOT R 13x600s 1.7" ~23.2 Oct. 27.32 Antu R 8x200s 0.8" ~24.5 The limits are preliminary and based on USNO-A2.0 photometry. Comparison of the images yields no significantly variable objects down to R=24.5. A section of the Antu Oct. 26.34 image is available at: http://www.astro.ku.dk/~brian_j/grb/grb001025/ ." //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 868 SUBJECT: GRB001025B, Radio observations DATE: 00/10/27 20:17:45 GMT FROM: Edo Berger at Caltech 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). This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 869 SUBJECT: XMM-Newton observation of GRB001025 DATE: 00/10/31 14:41:55 GMT FROM: Norbert Schartel at XMM-Newton/ESA B. Altieri, N. Schartel, M. Santos, L. Tomas, M. Guainazzi (XMM-Newton SOC, ESA ), L. Piro (IAS/CNR), A. Parmar (SSD/ESA) report: XMM-Newton observed the location of GRB001025 (Hurley et al. GCN 864) from Oct.27.003 to Oct.27.46 UT, i.e. 1.9 days after the burst. Preliminary analysis of the EPIC-pn and EPIC-MOS images show the presence of at least 4 sources in the error box. The brighter source (S1) has a flux of about 1-2 10**-13 erg/cm2/s in the 0.5-10 keV range. We cannot exclude a decay by about 40% over the whole observation, that would be expected from a decay power law with a slope of -1.5, the average value observed in X-ray afterglows. The remaining sources (S2, S3 & S4) are too faint to constrain the variability. The following coordinates have been derived with a preliminary attitude reconst ruction (equinox 2000): S1 R.A.= 8h36m38.7s Decl.= -13 06' 00" S2 R.A.= 8h36m30.1s Decl.= -13 05' 31" S3 R.A.= 8h36m30.5s Decl.= -13 03' 48" S4 R.A.= 8h36m48.6s Decl.= -13 05' 47" At this stage of reduction the error is expected to be less than 20". Refined coordinates will be distributed as soon as the final attitude reconstruction is obtained. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 870 SUBJECT: GRB 001025B, I-band observations DATE: 00/10/31 16:35:19 GMT FROM: Alberto Castro-Tirado at LAEFF-INTA 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. 48, 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 OPS NOTE (31oct00): There was a typo in the Circular as originally distributed. The "i.e. 24, 71..." phrase was changed to "i.e. 48, 71...".] //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 873 SUBJECT: GRB 001025B, Optical obervations DATE: 00/11/02 01:31:33 GMT FROM: Hye-Sook Park at LLNL 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. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 884 SUBJECT: CORRECTION to XMM-Newton observation of GRB001025 DATE: 00/11/10 17:59:19 GMT FROM: Norbert Schartel at XMM-Newton/ESA B. Altieri, N. Schartel, D. Lumb (XMM-Newton), L. Piro (IAS/CNR), A. Parmar (SSD/ESA) report: analysis of the XMM-Newton observation of GRB001025 (Altieri et al. GCN 869) based on the final attitude reconstruction shows the presence of 2 sources in the IPN/RXTE error box (Hurley et al. GCN864): S1 (J2000): R.A. = 8h36m35.92s Decl. = -13 04' 09.9" S2 (J2000): R.A. = 8h36m27.24s Decl. = -13 03' 41.5" The error is expected to be less than 10". Seven objects in the field of view of the X-ray cameras (30 arcminute diameter) appear to be the counterpart of sources in the USNO-A2.0 catalogue. They show position coincidences better than 7 arcsec for the positions obtained from the EPIC-MOS images and better than 4 arcsec for the positions obtained from the EPIC-pn image, respectively.