{ "bibcode": "2003GCN..2056....1F", "body": "J. Brodney Fitzgerald and Jerome A. Orosz (San Diego \nState University) report:\n\nWe have observed the field of GRB 030329 (Peterson & Price, GCN 1985)\nwith the 1 meter telescope at the Mount Laguna Observatory (located 45\nmiles east of downtown San Diego at a dark site in the Cleveland\nNational Forest at an altitude of 6100 feet or 1859 meters) on the\nnights of 2003 March 30 and 31 (UT). We used a Loral 2048 x 2048 CCD\n(binned 2 x 2) and Bessell B, V, R, and I filters. Both nights were\nphotometric. The instrumental time series were obtained using\nStetson's programs DAOPHOT, ALLSTAR, and DAOMASTER. The instrumental\nmagnitudes were placed on the standard scales using Hendon's (GCN\n2023) calibration. Our observations are summarized in the 4 tables\nbelow. The errors quote include only the DAOPHOT errors, and do not\ninclude errors in the zero points (estimated to be a few percent).\nThe CCD images of the GRB field and some Landolt fields are available\nupon request to orosz@sciences.sdsu.edu. Further observations are\nplanned for the night of April 1 (UT).\n\nWe also report the discovery of a possible eclipsing binary in the\nfield. The J2000 coordinates are 10:44:36.81, +21:26:58.8 (taken from\nHendon's list given in GCN 2023). The star was at a minimum\nbrightness around March 31 at 4:30 UT. Over the next three hours it\nbrightened by about 0.6 magnitudes in all the filters. The brightness\nlevel was roughly constant between about 8:10 UT and 11:00 UT. The\nstar was apparently constant on the night of March 30, although this\nconclusion is somewhat weak owing to the fact that it was saturated in\nmany of our images. The following table gives the extreme magnitudes\nobserved:\n\nFilter Min Mag Max Mag\n-----------------------------\n B 14.36 13.77\n V 14.00 13.41\n R 13.78 13.11\n I 13.60 13.00\n\nOur GRB observations follow: \n\nTable 1: B Observations:\n\n date-obs at start exptime mag err\n (sec) \n-------------------------------------------------\n2003-03-30T04:39:56.10 600.000 16.263 0.008\n2003-03-30T05:19:08.50 480.000 16.321 0.010\n2003-03-30T06:21:03.50 480.000 16.415 0.006\n2003-03-30T07:24:03.20 480.000 16.510 0.004\n2003-03-30T08:01:23.30 480.000 16.577 0.004\n2003-03-30T08:50:07.70 480.000 16.648 0.004\n2003-03-30T09:38:09.20 480.000 16.712 0.005\n2003-03-30T10:38:02.00 480.000 16.889 0.013\n2003-03-31T03:49:47.10 240.000 17.060 0.008\n2003-03-31T04:09:46.30 240.000 17.087 0.009\n2003-03-31T04:53:02.80 300.000 17.112 0.008\n2003-03-31T05:16:57.30 300.000 17.140 0.008\n2003-03-31T05:39:42.70 300.000 17.172 0.008\n2003-03-31T06:17:01.30 300.000 17.191 0.008\n2003-03-31T06:41:33.10 300.000 17.239 0.006\n2003-03-31T07:17:46.30 300.000 17.246 0.009\n2003-03-31T07:40:25.90 300.000 17.243 0.007\n2003-03-31T08:03:53.90 300.000 17.285 0.009\n2003-03-31T08:09:22.40 300.000 17.293 0.008\n2003-03-31T08:48:31.90 300.000 17.296 0.007\n2003-03-31T09:10:50.10 300.000 17.309 0.007\n2003-03-31T09:33:07.30 300.000 17.327 0.007\n2003-03-31T09:55:57.70 300.000 17.361 0.010\n2003-03-31T10:42:17.30 300.000 17.374 0.012\n2003-03-31T11:05:04.70 300.000 17.385 0.014\n\n\nTable 2: V Observations:\n\n date-obs at start exptime mag err\n (sec) \n-------------------------------------------------\n2003-03-30T04:39:56.10 600.000 15.8732 0.011\n2003-03-30T05:19:08.50 480.000 15.9492 0.007\n2003-03-30T06:21:03.50 480.000 16.0532 0.007\n2003-03-30T07:24:03.20 480.000 16.1452 0.004\n2003-03-30T08:01:23.30 480.000 16.1642 0.041\n2003-03-30T08:50:07.70 480.000 16.2722 0.004\n2003-03-30T09:38:09.20 480.000 16.3632 0.005\n2003-03-30T10:38:02.00 480.000 16.4142 0.007\n2003-03-31T03:54:27.10 240.000 16.6532 0.006\n2003-03-31T04:15:22.50 240.000 16.6672 0.011\n2003-03-31T04:59:11.40 300.000 16.7222 0.006\n2003-03-31T05:22:35.30 300.000 16.7522 0.007\n2003-03-31T05:45:20.50 300.000 16.7572 0.008\n2003-03-31T06:23:02.00 300.000 16.7942 0.006\n2003-03-31T06:47:19.40 300.000 16.8242 0.007\n2003-03-31T07:23:20.20 300.000 16.8622 0.006\n2003-03-31T07:46:01.50 300.000 16.8722 0.006\n2003-03-31T08:14:56.30 300.000 16.8802 0.007\n2003-03-31T08:20:24.00 300.000 16.8702 0.007\n2003-03-31T08:54:07.40 300.000 16.9002 0.006\n2003-03-31T09:16:24.00 300.000 16.9002 0.007\n2003-03-31T09:38:42.50 300.000 16.9172 0.007\n2003-03-31T10:01:27.30 300.000 16.9292 0.008\n2003-03-31T10:06:57.80 300.000 16.4682 0.010\n2003-03-31T10:12:26.00 300.000 16.9592 0.009\n2003-03-31T10:48:07.50 300.000 16.9402 0.012\n2003-03-31T11:10:40.10 300.000 16.9662 0.014\n\n\nTable 3: R Observations:\n\n date-obs at start exptime mag err\n (sec) \n-------------------------------------------------\n2003-03-30T04:39:56.10 600.000 15.402 0.006\n2003-03-30T05:19:08.50 480.000 15.524 0.007\n2003-03-30T06:21:03.50 480.000 15.694 0.009\n2003-03-30T07:24:03.20 480.000 15.801 0.004\n2003-03-30T08:01:23.30 480.000 15.841 0.005\n2003-03-30T08:50:07.70 480.000 15.917 0.004\n2003-03-30T09:38:09.20 480.000 16.004 0.006\n2003-03-30T10:38:02.00 480.000 16.048 0.006\n2003-03-31T03:59:42.40 240.000 16.277 0.009\n2003-03-31T04:20:13.10 240.000 16.313 0.024\n2003-03-31T05:04:46.90 300.000 16.356 0.006\n2003-03-31T05:28:31.20 300.000 16.378 0.005\n2003-03-31T05:50:50.80 300.000 16.392 0.007\n2003-03-31T06:29:05.50 300.000 16.421 0.006\n2003-03-31T06:52:51.60 300.000 16.459 0.005\n2003-03-31T07:28:53.20 300.000 16.479 0.006\n2003-03-31T07:51:53.40 300.000 16.487 0.007\n2003-03-31T08:26:10.70 300.000 16.516 0.022\n2003-03-31T08:31:42.00 300.000 16.509 0.006\n2003-03-31T08:59:40.10 300.000 16.536 0.007\n2003-03-31T09:21:55.50 300.000 16.535 0.006\n2003-03-31T09:44:13.50 300.000 16.539 0.008\n2003-03-31T10:18:09.40 300.000 16.560 0.007\n2003-03-31T10:29:22.00 300.000 16.555 0.009\n2003-03-31T10:53:41.70 300.000 16.577 0.007\n2003-03-31T11:16:11.50 300.000 16.583 0.015\n\n\nTable 4: I Observations:\n\n date-obs at start exptime mag err\n (sec) \n-------------------------------------------------\n2003-03-30T04:39:56.10 600.000 15.0006 0.009\n2003-03-30T05:19:08.50 480.000 15.1076 0.012\n2003-03-30T06:21:03.50 480.000 15.2816 0.007\n2003-03-30T07:24:03.20 480.000 15.3916 0.004\n2003-03-30T08:01:23.30 480.000 15.4266 0.027\n2003-03-30T08:50:07.70 480.000 15.5186 0.005\n2003-03-30T09:38:09.20 480.000 15.6376 0.008\n2003-03-30T10:38:02.00 480.000 15.7036 0.011\n2003-03-31T04:04:32.10 240.000 15.8716 0.008\n2003-03-31T04:25:02.80 240.000 15.8926 0.010\n2003-03-31T05:10:34.50 300.000 15.9396 0.006\n2003-03-31T05:34:03.50 300.000 15.9596 0.006\n2003-03-31T05:56:25.90 300.000 15.9946 0.006\n2003-03-31T06:35:53.60 300.000 16.0276 0.007\n2003-03-31T06:58:26.10 300.000 16.0536 0.006\n2003-03-31T07:34:51.90 300.000 16.0826 0.008\n2003-03-31T07:58:11.70 300.000 16.0746 0.008\n2003-03-31T08:37:12.10 300.000 16.0836 0.008\n2003-03-31T08:42:40.70 300.000 16.1066 0.006\n2003-03-31T09:05:09.40 300.000 16.1026 0.007\n2003-03-31T09:27:28.10 300.000 16.1196 0.008\n2003-03-31T09:49:53.50 300.000 16.1346 0.009\n2003-03-31T10:23:41.20 300.000 16.1386 0.009\n2003-03-31T10:35:00.70 300.000 16.1716 0.013\n2003-03-31T10:59:14.40 300.000 16.1476 0.012\n2003-03-31T11:21:45.60 300.000 16.1626 0.019\n\nReferences:\n\nHendon, A., et al. 2003, GCN 2023\nLandolt, A. U. 1992, AJ, 104, 340\nPeterson, B, A. & Price, P. 2003, GCN 1985\nStetson, P. B. 1987, PASP, 99, 191\n \n\n\n-------------------------------------------------------------------------\n Jerome A. Orosz\n Assistant Professor of Astronomy, San Diego State University\n 5500 Campanile Drive, San Diego, CA 92182-1221\n(619) 594-7118 (office), 594-6182 (dept. secretary), 594-1413 (dept. fax) \n http://mintaka.sdsu.edu/faculty/orosz/web/", "circularId": 2056, "createdOn": 1049163110000, "email": "orosz@zwartgat.sdsu.edu", "subject": "GRB 030329: optical observations", "submitter": "Jerome A. Orosz at San Diego State U ", "eventId": "GRB 030329" }