GCN Circular 7239
Subject
X-ray transient in NGC 2770: RTT150 optical observations
Date
2008-01-30T16:25:52Z (17 years ago)
From
Irek Khamitov at TUG <irekk@tug.tug.tubitak.gov.tr>
I. Khamitov (TUG), I. Bikmaev, R. Gumerov,
A. Nemtinov, N. Sakhibullin (KSU/AST),
R. Burenin, M. Pavlinsky, R. Sunyaev (IKI),
Z. Eker (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.)
report:
We continued observations of the optical counterpart to X-ray transient in
NGC 2770, SN2008D (GCN Rep. 110.1, GCN Circ. 7160, 7161) with
Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National
Observatory, Turkey) in 26 (02:50-04:50UT), 27 (01:00-04:00UT), 28
(04:05UT) Jan 2008 using ANDOR TE CCD (DW-436).
Series of BVRI direct images were taken on Jan 26 and 27, and also we made
300s R-exposure on Jan 28 under windy weather conditions (the seeing was
more then 2 arcsec for all observations).
The object shows no variability between the nignts at the level >~ 0.05mag.
In comparision with the our previous observations (11, 12 Jan, Bikmaev et
al., GCN7206) the OT is brighter approximatelly by 1.0 mag and 0.6 mag
in R and B bands respectively.
Assuming R=17.3 and B=17.7 magnitudes for USNO-A2.0 1200-06240802 star, we
estimate the following magnitudes for the transient:
Time, UT t-t0,days mag
Jan 26.14 16.58 R = 17.03
Jan 26.15 16.59 B = 18.06
Jan 27.09 17.53 B = 18.13
Jan 27.12 17.56 R = 17.01
Jan 28.17 18.61 R = 16.98
Also we found that in our previous circular there was a misprint in t-t0
column. The correct t-t0 values can be obtained by adding one day to the
values in that circular.
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