TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2390 SUBJECT: GRB030913: AAVSO optical observations DATE: 03/09/19 19:09:12 GMT FROM: Arto Oksanen at Nyrola Obs., Finland Arto Oksanen, Arne Henden, Cristovao Jacques, Andrea Tasselli, Odd Trondal, Michel Bonnardeau and Bruce Gary report on behalf of the AAVSO International High Energy Network: We have observed the GRB030913 (=H2849) error circle starting September 13, 2003 18:56 UT, less than 2 hours from the burst. The revised error circle (Donaghy et al., GCN 2388), was covered completly by several observers. The earlier larger error circle (M. Suzuki et al., GCN 2383) was covered by 90 percent in 7.9 hours. All images vere visually checked and most images were also checked by software against USNOA2.0 and USNOB1.0 catalogs to detect any optical transients. No new objects were found to the image limits. At 2.85 hrs after the burst, no afterglow was detected to R=18 (defined by images marked with stars on the following summary). Summary of all observations: total image center limiting from mid UT exposure RA (J200.0) DEC mag (R) burst(h) obs ----------------------------------------------------------------- 2003-09-13T18:56 20x10s 20 58 11 -02 17 15.5 1.83 OT 2003-09-13T19:13 6x60s 20 58 38 -01 57 18.0 2.10 AO * 2003-09-13T19:21 6x60s 20 57 15 -02 00 18.0 2.23 AO * 2003-09-13T19:29 6x60s 20 58 44 -02 12 18.0 2.37 AO * 2003-09-13T19:37 6x60s 20 57 23 -02 14 18.0 2.50 AO * 2003-09-13T19:49 6x60s 20 59 01 -02 20 18.0 2.70 AO * 2003-09-13T19:58 6x60s 20 57 39 -02 22 18.0 2.85 AO * 2003-09-13T20:53 6x60s 20 58 49 -01 53 17.5 3.77 AO 2003-09-13T21:05 6x60s 20 57 11 -02 00 17.5 3.97 AO 2003-09-13T21:15 6x60s 20 58 45 -02 12 17.5 4.13 AO 2003-09-13T21:23 6x60s 20 57 21 -02 14 17.0 4.27 AO 2003-09-13T21:30 42x60s 20 57 49 -02 22 18.0 4.39 AT 2003-09-13T21:31 6x60s 20 58 51 -02 26 17.5 4.40 AO 2003-09-13T21:39 6x60s 20 57 26 -02 29 17.5 4.53 AO 2003-09-13T22:26 10x45s 20 57 50 -02 14 18.0 5.32 CJ 2003-09-13T22:38 10x45s 20 57 49 -01 59 18.0 5.52 CJ 2003-09-13T22:50 10x45s 20 57 55 -02 32 18.0 5.72 CJ 2003-09-13T23:38 6x45s 20 56 32 -02 17 17.5 6.52 CJ 2003-09-13T23:50 4x45s 20 56 29 -02 01 17.5 6.43 CJ 2003-09-14T00:24 4x45s 20 59 14 -02 14 17.5 7.28 CJ 2003-09-16T02:40 18x60s 20 58 02 -02 12 20.3 57.53 BG 2003-09-17T03:55 8x900s 20 58 06 -02 35 22.7 82.82 AH ----------------------------------------------------------------- Observer details: AO: Arto Oksanen, Finland FOV: 24 x 16 arc min Equipment: 0.40m SCT f/5.0, ST8XE CCD, Rc-filter OT: Odd Trondal, Norway FOV: 20 x 15 arc min Equipment: 0.25 m f5.75, MX916 CCD, R-filter CJ: Cristovao Jacques, Brazil FOV: 25 x 17 arc min Equipment: 0.30m SCT f/3.0 , ST7E CCD, unfiltered BG: Bruce Gary, Arizona, U.S.A. FOV: 23 x 15 arc min Equipment: 0.35 m SCT, AO-7 stabilizer, ST-8XE CCD, unfiltered AT: Andrea Tasselli, UK FOV: 16 x 22 arc min Equipment: 0.15 m Maksutov Cassegrain f/7, MX716 CCD AH: Arne Henden, Arizona, U.S.A. FOV: 11 x 11 arcmin Equipment: 1.0m, CCD, R-filter The AAVSO International High Energy network is grateful for a generous grant from the Curry Foundation and to NASA for the financial support for the High Energy Workshops for Amateur Astronomers.