//////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2173 SUBJECT: IPN triangulation of GRB030425 (single error box) DATE: 03/04/26 17:33:50 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley and T. Cline, on behalf of the Ulysses, Konus, and Mars Odyssey GRB teams, 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 E. Mazets and S. Golenetskii, on behalf of the Konus-Wind GRB team, report: Ulysses, Mars Odyssey (HEND & GRS), and Konus-Wind observed this GRB at 56911 seconds. As observed by Ulysses, it had a duration of over 500 seconds, a 25-100 keV fluence of approximately 5.9E-05 erg/cm2, and a peak flux of approximately 1.6E-06 erg/cm2 s over 0.50 seconds. Despite the intensity of the event, the burst arrival direction with respect to the inter-spacecraft vectors was unfavorable, and we can only triangulate it to a preliminary, 3 sigma error box whose approximate area is 2300 sq. arcmin. and whose coordinates are: RA(2000) DEC(2000) ERROR BOX CENTER: 15 h 33 m 11.26 s 26 o 17 ' 30.30 " ERROR BOX CORNER 1: 15 h 30 m 49.56 s 25 o 23 ' 00.71 " ERROR BOX CORNER 2: 15 h 25 m 36.77 s 23 o 33 ' 25.40 " ERROR BOX CORNER 3: 15 h 45 m 52.03 s 30 o 47 ' 37.49 " ERROR BOX CORNER 4: 15 h 35 m 52.69 s 27 o 18 ' 54.68 " This error box may be improved. //////////////////////////////////////////////////////////////////////// TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2182 SUBJECT: GRB030425: CrAO optical observation DATE: 03/04/30 19:24:38 GMT FROM: Alexei Pozanenko at IKI, Moscow V.Rumyantsev (CrAO), A.Pozanenko (IKI), K. Hurley (UCBerkeley) on behalf of large collaboration report: We have imaged the error box of GRB 030425 reported by K.Hurley at al. (IPN 643, GCN 2173) with the AT-64 telescope of Crimean Astrophysical Observatory (FOV =53x35 arcminutes). 46 x 120 sec unfiltered images cover ~75% of the error box. The images were obtained between Apr. 26 UT 18:28:33.94 and 27 UT 01:33:05.92, i.e., in 26.66 - 33.75 hrs after burst. The limiting magnitude (3 sigma) is about 19.5 for all images. Visual comparison with the DSS reveals no optical transient. (The coverage figure can be found in http://grb.rssi.ru/GRB030425. All frames marked in the figure were obtained from 2 to 5 times in different epochs.) Detailed comparison of the images is underway.