GCN Circular 2160
Subject
GRB030329, optical observation
Date
2003-04-21T22:46:18Z (22 years ago)
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.