//////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 626 SUBJECT: GRB000408 DATE: 00/04/08 21:43:25 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley, S. Barthelmy, R. M. Kippen, and T. Cline, on behalf of the Ulysses, BATSE, and NEAR GRB teams, report: Ulysses, BATSE, and NEAR observed GRB000408 (=BATSE 8069) at 9348 s UT. As observed by Ulysses, this burst had a T90 duration of 2.5 s, a 25-100 keV fluence of 7.4x10^-6 erg/cm^2, and a peak flux over 0.5 s of 3.7x10^-6 erg/cm^2 s. Preliminary triangulation gives a ~200 sq. arcmin. error box with the following coordinates: RA(2000) DEC(2000) 9 h 10 m 31.86 s 66 o 34 ' 35.72 " (CENTER) 9 h 14 m 57.83 s 66 o 30 ' 25.93 " (CORNER) 9 h 7 m 41.72 s 66 o 33 ' 18.90 " (CORNER) 9 h 13 m 19.82 s 66 o 35 ' 43.51 " (CORNER) 9 h 5 m 56.89 s 66 o 38 ' 22.95 " (CORNER) It should be possible to refine this error box considerably within 24 h, when the high time resolution data become available. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 628 SUBJECT: GRB000408, lotis optical observations DATE: 00/04/10 05:53:34 GMT FROM: Hye-Sook Park at LLNL H. S. Park, R. Porrata (LLNL), G. G. Williams, D. Hartmann (Clemson), K. Hurley (UCB), S. Barthelmy (GSFC) report on behalf of the LOTIS collaboration: The realtime BATSE trigger came at 7:37 pm local time when the sky was too bright for observation. However, Lotis' wide-field-of-view sky patrol data covered the grb000408 IPN error box (GCN 626) 1.64 hours after the burst (15241s UTC). Comparison of the images with the previous sky patrol images, the Digital Sky Survey, and the Guide Star Catalog reveal no OT within the IPN error box brighter than m = 15.0 (5-sigma). No astronomical filter was used during these observations. Further analysis is in progress. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 629 SUBJECT: GRB000408: Optical CCD Observations from MIRO DATE: 00/04/10 07:06:08 GMT FROM: Kiran S Baliyan at Physical Research Lab, Ahmedabad,India K.S. Baliyan, U.C. Joshi, S. Mondal, S. Chandrasekhar, J.K. Jain and B.G. Anandrao (MIRO-PRL, Ahmedabad, India) report: Optical afterglow follow up observations of the grb000408 were made covering IPN error box (GCN 626) on April 9, 2000, beginning 16:15 UT. The 1024*1024 CCD (FOV 6'*6') mounted on 1.2 M IR telescope at Mt Abu IR Observatory, operated by Physical Research Laboratory, Ahmedabad- India, was used to get 600 seconds exposures each in V and I filters at each location covering the error box. The data analysis is in progress and an image will be put on the laboratory web page when available. We also intend to continue observations of the optical counterpart tonight as well. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 632 SUBJECT: Refined IPN error box for GRB000408 DATE: 00/04/10 18:37:30 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley, R. M. Kippen, and T. Cline, on behalf of the Ulysses, BATSE, and NEAR GRB teams, report: We have derived a refined error box for GRB000408 (=BATSE 8069, GCN 626), whose area is ~60 sq. arcmin. Its coordinates are: RA(2000) DEC(2000) 9 h 9 m 17.91 s +66 o 34 ' 49.78 " (CENTER) 9 h 11 m 30.33 s +66 o 32 ' 31.07 " (CORNER) 9 h 8 m 10.97 s +66 o 33 ' 43.86 " (CORNER) 9 h 10 m 24.59 s +66 o 35 ' 54.27 " (CORNER) 9 h 7 m 3.18 s +66 o 37 ' 2.96 " (CORNER) Further refinements are still possible. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 633 SUBJECT: GRB 000408, optical observations DATE: 00/04/10 22:44:36 GMT FROM: Arne A. Henden at USNO/USRA A. Henden (USRA/USNO), C. Luginbuhl (USNO), B. Canzian (USNO) on behalf of the USNO GRB Team, Vijay Mohan, S. B. Pandey and Ram Sagar, UPSO (Nainital), David Alcalde and David Martinez-Delgado, IAC (Tenerife), Jose Maria Castro Ceron, ROA (San Fernando), Alberto Castro-Tirado, LAEFF-INTA (Madrid) and IAA-CSIC (Granada), and Javier Gorosabel Urkia, DSRI report: We have observed the entire preliminary IPN error box for GRB 000408 (GCN#626) as well as the refined error box (GCN#632) from several sites and on both available nights. Because of the shape of the error box, mosaics were used at each site, limiting the depth of exposure for any particular field. Only R-band observations were made. A log of the observations is given below. TEL. MARCH (UT) TEXP RA DEC -------------------------------------------------- IAC80 8.9352 -- 9.0103 3800 9:10:41 +66:34:15 IAC80 9.0094 -- 9.0140 200 9:09:39 +66:34:15 IAC80 9.0141 -- 9.0187 200 9:08:39 +66:34:47 IAC80 9.0176 -- 9.0223 200 9:07:42 +66:35:15 IAC80 9.0210 -- 9.0257 200 9:06:41 +66:35:47 IAC80 9.0248 -- 9.0294 200 9:11:41 +66:34:50 IAC80 9.0292 -- 9.0338 200 9:12:40 +66:34:21 IAC80 9.0327 -- 9.0373 200 9:13:42 +66:33:52 IAC80 9.0360 -- 9.0407 200 9:14:41 +66:33:20 IAC80 9.0360 -- 9.0407 200 9:14:41 +66:33:20 IAC80 9.9319 -- 9.9741 3600 9:08:26 +66:33:28 UPSO 9.7667 -- 9.7724 500 9:48:41 +66:35:15 UPSO 9.7764 -- 9.7821 500 9:10:27 +66:35:08 USNO 9.136 -- 9.225 1800 9:13:41 +66:33:51 USNO 9.128 -- 9.216 1800 9:12:02 +66:33:51 USNO 9.121 -- 9.209 1800 9:10:20 +66:33:51 USNO 9.145 -- 9.233 1800 9:08:41 +66:33:51 USNO 9.153 -- 9.241 1800 9:07:01 +66:33:51 USNO 10.154 -- 10.176 1800 9:13:41 +66:33:51 USNO 10.176 -- 10.198 1800 9:12:02 +66:33:51 USNO 10.130 -- 10.152 1800 9:10:20 +66:33:51 USNO 10.199 -- 10.229 1800 9:08:41 +66:33:51 USNO 10.229 -- 10.251 1800 9:07:01 +66:33:51 POSS-II/F for this field is not available through DSS. However, it is available through the USNO PMM pixel database. We have placed three files on the anon ftp server that cover the error box: ftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb000408-1.jpg ftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb000408-2.jpg ftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb000408-3.jpg in order of increasing RA. A finder chart from POSS-I with the refined error box marked on it is at: http://www.dsri.dk/~jgu/grb000408/grb000408.dss.gif No candidate was found above the POSS-II plate limit. The two deep exposure sets from USNO were blinked to look for transients below the POSS-II plate limit. While several candidates are present, none is entirely convincing at a limiting magnitude of approximately R=21.5. However, for completeness, here are the two best candidates inside the error box, both R=20.5 or fainter: A 09:11:04.82 +66:33:31.3 J2000 B 09:08:51.36 +66:33:36.5 J2000 Preliminary BVRI all-sky calibration of the central part of the error box can be found at ftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb000408.dat The external zero-point errors for this file are estimated to be +/- 0.05mag. Refinement of this photometry will be performed in late April if an OT is discovered. Further data analysis is in progress. [GCN OPS NOTE (11 Apr 00): The co-authors S.B.Pandey & David Martinez-Delgado were added to the list.]