{
  "bibcode": "2003GCN..2022....1Z",
  "body": "S. Zharikov (OAN SPM, IA UNAM, Mexico), E. Benitez, J. Torrealba, J.  \nStepanian (IA UNAM, Mexico) report: \n\nWe have observed the GRB030329 OT\nfound by B.A. Peterson and P.A. Price (GCN 1985) with 1.5m and 2.1m\ntelescopes of SPM Observatory, BC, Mexico. A set of exposures in UBVRI\nBessel filters was obtained with 1.5m telescope under photometric\nconditions. Standard stars RU 149 and PG 1633+099 from Landolt's catalogue\nwere used for photometric calibrations. The results of photometry are\nfollowing:\n 30 March U B V R I\n UT 03:55 15.23 16.00 15.68 15.38 14.95\n UT 05:55 15.44 16.25 15.92 15.61 15.19\n UT 08:00 15.80 16.44 16.16 15.84 15.41\n UT 10:16 15.99 16.65 16.40 16.05 15.62 \nErrors are about 0.02. \nUSNO U1050_06350247 star with coordinates (AR=10 44 42; DEC=+21 32 32, \nJ2000) can be used as the secondary standard in the OT field:\n B = 17.93(5); V =16.84(3); R = 16.04(2); I = 15.48(2)\n \nThe continuous light curve in the R band with exposures 240 and 120 sec \nwas obtained during 6.5h from 03:55 UT utill 10:40 UT. We estimate the \ndecline rate to be about 0.11 mag/hour.\n\nSpectra of the optical afterglow of GRB 030329 were obtained with the\n2.1-m telescope and B&Ch spectrograph (600l/mm) starting at 05:22 UT. The\nspectra cover the wavelength range of 3900 to 6100 AA with a resolution of\n2.2A/pix. Data analysis is in progress.\n\nThis message may be cited.",
  "circularId": 2022,
  "createdOn": 1049027397000,
  "email": "zhar@astrosen.unam.mx",
  "subject": "GRB030329, SPM optical observations",
  "submitter": "Sergej Zharikov at OAN IA UNAM  <zhar@astrosen.unam.mx>",
  "eventId": "GRB 030329"
}