Skip to main content
New! Circulars over Kafka, Heartbeat Topic, and Schema v4.1.0. See news and announcements

GCN Circular 2798

Subject
GRB041006, optical observation in CrAO
Date
2004-10-12T20:51:02Z (20 years ago)
From
Vasilij Rumjantsev at CrAO <rum@crao.crimea.ua>
V.Rumyantsev (CrAO), V.Biryukov (SAI, MSU),  A.Pozanenko (IKI) report:

We have observed the OT found by G. Da Costa, N. Noel and P.A. Price
(GCN2765) of GRB041006 (HETE #3570, M. Galassi, et al. GCN2770) with AT-64
telescope of Crimean Astrophysical Observatory. Several 120 s exposure
images in R-band were taken between (UT) Oct.6 17:11 - 22:40 under moderate
weather conditions and poor seeing. After inspection only 21 images
between Oct.6 (UT)18:33-20:27 is used for further reduction. Additional
observation on Oct. 7 reveals no OT. The data reduction against seven USNO
A2.0 field stars results to following magnitude of the OT and limiting
magnitude for October 7

Mean UT, exposure, mag,    S/N

Oct 6.81 21x120s   19.35R  3.8
Oct 7.85 64x120s   >20.0R  3

We do not apply a possible correction to a brightness of the field stars
suggested by D. Fugazza et al. (GCN 2782), A. Monfardini et al. (GCN 2790)
and P. Garnavich, X. Zhao, T. Pimenova (GCN 2792).

This message may be cited.
Looking for U.S. government information and services? Visit USA.gov