Return to Home Page
TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2160 SUBJECT: GRB030329, optical observation DATE: 03/04/21 22:46:18 GMT FROM: Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru> M.A. Ibrahimov, I.M. Asfandiyarov, B.B. Kahharov (Ulugh Beg Astronomical Institute of the Uzbek Academy of Sciences), A.Pozanenko (IKI), V.Rumyantsev (CrAO), G.Beskin (SAO) on behalf of large collaboration report: We have observed the OT GRB030329 found by B.Peterson and P.Price (GCN 1985) using 1.5m telescope of Mt.Maidanak High-altitude Observatory. Several BVRI Bessel images were obtained on April, 7,9,10 and 20. The seeing on Apr.7 was in range of 1-1.5 arcsec, on Apr.10 - 0.9-1 arcsec for R and in 1-1.3 arcsec for B. In Apr. 9 the weather was unfavorable and some images were obtained trough clouds. Based on filed photometry still by A. Henden (GCN 2023) we estimate the OT magnitudes: Mid time UT, Apr. exposure filter mag err 7.7819 7x600 B 19.78 0.04 7.7986 5x600 V 19.20 0.03 7.7771 8x600 R 18.84 0.03 7.8160 3x600 I 18.44 0.06 9.7653 2x600 B 20.07 0.14 9.7813 2x600 V 19.37 0.08 9.7729 4x600 R 19.10 0.06 10.7625 6x600 B 19.96 0.08 10.7792 6x600 V 19.56 0.06 10.7354 6x600 R 19.29 0.07 10.7792 4x600 I 19.11 0.08 And preliminary reduction of measurements on Apr.20 is following UT, Apr. exposure filter mag 20.6444 2x600 R 19.92 20.6604 2x600 B 21.08 With typical error of 0.15 (B) and 0.13 (R) Our measurements on Apr. 10 are consistent with TNG observation by V. Testa et al. (GCN 2141). While in Apr. 7 - 10 the brightness of OT is consistent with slow fading, we could not detect brightness change in R (within our accuracy) between observation on Apr.14 (GCN 2141) and our measurement on Apr. 20.
Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
