TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2056 SUBJECT: GRB 030329: optical observations DATE: 03/04/01 02:11:50 GMT FROM: Jerome A. Orosz at San Diego State U J. Brodney Fitzgerald and Jerome A. Orosz (San Diego State University) report: We have observed the field of GRB 030329 (Peterson & Price, GCN 1985) with the 1 meter telescope at the Mount Laguna Observatory (located 45 miles east of downtown San Diego at a dark site in the Cleveland National Forest at an altitude of 6100 feet or 1859 meters) on the nights of 2003 March 30 and 31 (UT). We used a Loral 2048 x 2048 CCD (binned 2 x 2) and Bessell B, V, R, and I filters. Both nights were photometric. The instrumental time series were obtained using Stetson's programs DAOPHOT, ALLSTAR, and DAOMASTER. The instrumental magnitudes were placed on the standard scales using Hendon's (GCN 2023) calibration. Our observations are summarized in the 4 tables below. The errors quote include only the DAOPHOT errors, and do not include errors in the zero points (estimated to be a few percent). The CCD images of the GRB field and some Landolt fields are available upon request to orosz@sciences.sdsu.edu. Further observations are planned for the night of April 1 (UT). We also report the discovery of a possible eclipsing binary in the field. The J2000 coordinates are 10:44:36.81, +21:26:58.8 (taken from Hendon's list given in GCN 2023). The star was at a minimum brightness around March 31 at 4:30 UT. Over the next three hours it brightened by about 0.6 magnitudes in all the filters. The brightness level was roughly constant between about 8:10 UT and 11:00 UT. The star was apparently constant on the night of March 30, although this conclusion is somewhat weak owing to the fact that it was saturated in many of our images. The following table gives the extreme magnitudes observed: Filter Min Mag Max Mag ----------------------------- B 14.36 13.77 V 14.00 13.41 R 13.78 13.11 I 13.60 13.00 Our GRB observations follow: Table 1: B Observations: date-obs at start exptime mag err (sec) ------------------------------------------------- 2003-03-30T04:39:56.10 600.000 16.263 0.008 2003-03-30T05:19:08.50 480.000 16.321 0.010 2003-03-30T06:21:03.50 480.000 16.415 0.006 2003-03-30T07:24:03.20 480.000 16.510 0.004 2003-03-30T08:01:23.30 480.000 16.577 0.004 2003-03-30T08:50:07.70 480.000 16.648 0.004 2003-03-30T09:38:09.20 480.000 16.712 0.005 2003-03-30T10:38:02.00 480.000 16.889 0.013 2003-03-31T03:49:47.10 240.000 17.060 0.008 2003-03-31T04:09:46.30 240.000 17.087 0.009 2003-03-31T04:53:02.80 300.000 17.112 0.008 2003-03-31T05:16:57.30 300.000 17.140 0.008 2003-03-31T05:39:42.70 300.000 17.172 0.008 2003-03-31T06:17:01.30 300.000 17.191 0.008 2003-03-31T06:41:33.10 300.000 17.239 0.006 2003-03-31T07:17:46.30 300.000 17.246 0.009 2003-03-31T07:40:25.90 300.000 17.243 0.007 2003-03-31T08:03:53.90 300.000 17.285 0.009 2003-03-31T08:09:22.40 300.000 17.293 0.008 2003-03-31T08:48:31.90 300.000 17.296 0.007 2003-03-31T09:10:50.10 300.000 17.309 0.007 2003-03-31T09:33:07.30 300.000 17.327 0.007 2003-03-31T09:55:57.70 300.000 17.361 0.010 2003-03-31T10:42:17.30 300.000 17.374 0.012 2003-03-31T11:05:04.70 300.000 17.385 0.014 Table 2: V Observations: date-obs at start exptime mag err (sec) ------------------------------------------------- 2003-03-30T04:39:56.10 600.000 15.8732 0.011 2003-03-30T05:19:08.50 480.000 15.9492 0.007 2003-03-30T06:21:03.50 480.000 16.0532 0.007 2003-03-30T07:24:03.20 480.000 16.1452 0.004 2003-03-30T08:01:23.30 480.000 16.1642 0.041 2003-03-30T08:50:07.70 480.000 16.2722 0.004 2003-03-30T09:38:09.20 480.000 16.3632 0.005 2003-03-30T10:38:02.00 480.000 16.4142 0.007 2003-03-31T03:54:27.10 240.000 16.6532 0.006 2003-03-31T04:15:22.50 240.000 16.6672 0.011 2003-03-31T04:59:11.40 300.000 16.7222 0.006 2003-03-31T05:22:35.30 300.000 16.7522 0.007 2003-03-31T05:45:20.50 300.000 16.7572 0.008 2003-03-31T06:23:02.00 300.000 16.7942 0.006 2003-03-31T06:47:19.40 300.000 16.8242 0.007 2003-03-31T07:23:20.20 300.000 16.8622 0.006 2003-03-31T07:46:01.50 300.000 16.8722 0.006 2003-03-31T08:14:56.30 300.000 16.8802 0.007 2003-03-31T08:20:24.00 300.000 16.8702 0.007 2003-03-31T08:54:07.40 300.000 16.9002 0.006 2003-03-31T09:16:24.00 300.000 16.9002 0.007 2003-03-31T09:38:42.50 300.000 16.9172 0.007 2003-03-31T10:01:27.30 300.000 16.9292 0.008 2003-03-31T10:06:57.80 300.000 16.4682 0.010 2003-03-31T10:12:26.00 300.000 16.9592 0.009 2003-03-31T10:48:07.50 300.000 16.9402 0.012 2003-03-31T11:10:40.10 300.000 16.9662 0.014 Table 3: R Observations: date-obs at start exptime mag err (sec) ------------------------------------------------- 2003-03-30T04:39:56.10 600.000 15.402 0.006 2003-03-30T05:19:08.50 480.000 15.524 0.007 2003-03-30T06:21:03.50 480.000 15.694 0.009 2003-03-30T07:24:03.20 480.000 15.801 0.004 2003-03-30T08:01:23.30 480.000 15.841 0.005 2003-03-30T08:50:07.70 480.000 15.917 0.004 2003-03-30T09:38:09.20 480.000 16.004 0.006 2003-03-30T10:38:02.00 480.000 16.048 0.006 2003-03-31T03:59:42.40 240.000 16.277 0.009 2003-03-31T04:20:13.10 240.000 16.313 0.024 2003-03-31T05:04:46.90 300.000 16.356 0.006 2003-03-31T05:28:31.20 300.000 16.378 0.005 2003-03-31T05:50:50.80 300.000 16.392 0.007 2003-03-31T06:29:05.50 300.000 16.421 0.006 2003-03-31T06:52:51.60 300.000 16.459 0.005 2003-03-31T07:28:53.20 300.000 16.479 0.006 2003-03-31T07:51:53.40 300.000 16.487 0.007 2003-03-31T08:26:10.70 300.000 16.516 0.022 2003-03-31T08:31:42.00 300.000 16.509 0.006 2003-03-31T08:59:40.10 300.000 16.536 0.007 2003-03-31T09:21:55.50 300.000 16.535 0.006 2003-03-31T09:44:13.50 300.000 16.539 0.008 2003-03-31T10:18:09.40 300.000 16.560 0.007 2003-03-31T10:29:22.00 300.000 16.555 0.009 2003-03-31T10:53:41.70 300.000 16.577 0.007 2003-03-31T11:16:11.50 300.000 16.583 0.015 Table 4: I Observations: date-obs at start exptime mag err (sec) ------------------------------------------------- 2003-03-30T04:39:56.10 600.000 15.0006 0.009 2003-03-30T05:19:08.50 480.000 15.1076 0.012 2003-03-30T06:21:03.50 480.000 15.2816 0.007 2003-03-30T07:24:03.20 480.000 15.3916 0.004 2003-03-30T08:01:23.30 480.000 15.4266 0.027 2003-03-30T08:50:07.70 480.000 15.5186 0.005 2003-03-30T09:38:09.20 480.000 15.6376 0.008 2003-03-30T10:38:02.00 480.000 15.7036 0.011 2003-03-31T04:04:32.10 240.000 15.8716 0.008 2003-03-31T04:25:02.80 240.000 15.8926 0.010 2003-03-31T05:10:34.50 300.000 15.9396 0.006 2003-03-31T05:34:03.50 300.000 15.9596 0.006 2003-03-31T05:56:25.90 300.000 15.9946 0.006 2003-03-31T06:35:53.60 300.000 16.0276 0.007 2003-03-31T06:58:26.10 300.000 16.0536 0.006 2003-03-31T07:34:51.90 300.000 16.0826 0.008 2003-03-31T07:58:11.70 300.000 16.0746 0.008 2003-03-31T08:37:12.10 300.000 16.0836 0.008 2003-03-31T08:42:40.70 300.000 16.1066 0.006 2003-03-31T09:05:09.40 300.000 16.1026 0.007 2003-03-31T09:27:28.10 300.000 16.1196 0.008 2003-03-31T09:49:53.50 300.000 16.1346 0.009 2003-03-31T10:23:41.20 300.000 16.1386 0.009 2003-03-31T10:35:00.70 300.000 16.1716 0.013 2003-03-31T10:59:14.40 300.000 16.1476 0.012 2003-03-31T11:21:45.60 300.000 16.1626 0.019 References: Hendon, A., et al. 2003, GCN 2023 Landolt, A. U. 1992, AJ, 104, 340 Peterson, B, A. & Price, P. 2003, GCN 1985 Stetson, P. B. 1987, PASP, 99, 191 ------------------------------------------------------------------------- Jerome A. Orosz Assistant Professor of Astronomy, San Diego State University 5500 Campanile Drive, San Diego, CA 92182-1221 (619) 594-7118 (office), 594-6182 (dept. secretary), 594-1413 (dept. fax) http://mintaka.sdsu.edu/faculty/orosz/web/