GCN Circular 990
Subject
GRB010222 Optical observations
Event
Date
2001-02-25T20:14:35Z (25 years ago)
From
Arto Oksanen at Nyrola Obs., Finland <arto.oksanen@tietoenator.com>
A. Oksanen, M. Moilanen, H. Hyvonen, R. Pasanen, and
P. Tikkanen of the Nyrola Observatory GRB team and
the AAVSO International GRB network, report:
We observed the optical transient for GRB010222 (GCN 961) with
the 0.4m telescope and ST7E CCD camera of the Nyrola
Observatory on the night of 010222/010223 UT. Observing conditions
were quite good: sky was clear, but strong wind enlarged the star
images. Our preliminary untransformed BVR measures of the OT (GCN 961)
from that night, using Henden star A (GCN 967) as calibrated by
Henden (GCN 987) for the comparison star, are as follows:
UT (mid) mag merr filter exposure(s)
----------------------------------------------
20010222.8227 19.84 0.31 B 12x300
20010222.8744 19.57 0.13 Rc 12x300
20010222.9187 19.70 0.13 V 12x300
20010222.9661 19.69 0.15 Rc 12x300
20010223.0134 19.92 0.14 V 12x300
20010223.0628 19.92 0.17 Rc 12x300
20010223.1439 20.29 0.21 V 6x300
20010223.1665 20.11 0.31 Rc 6x300
The images are available on http://nyrola.jklsirius.fi/grb/grb010222/.
We want to thank A. Henden (USRA/USNO) about preparing this circular.
This message can be cited.