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GCN Circular 177

Subject
Optical Observations of GRB981226
Date
1998-12-29T05:19:21Z (25 years ago)
From
Przemyslaw R. Wozniak at Princeton U. Obs. <wozniak@astro.princeton.edu>
Przemyslaw R. Wozniak reports for OGLE team:

An attempt to observe optical transient of GRB981226 was made
in BeppoSAX 6' radius region reported by Di Ciolo et al. (IAUCirc 7074).
On three nights following the announcement, Dec 27-29, approximately
between 1:15 and 2:30 UT I collected 10 and 15-minute frames in I band,
with the 1.3 m Warsaw University Observatory Telescope on Las Campanas.
This amounted to 70,70,80 minutes of integration each night
at 1.4, 1.3 and 1.2" seeing respectively.

On the first night a faint object at R.A. = 23h29m27s.3, Decl. = -23d56'54"
with approximate magnitude I = 20.3 showed some evidence for decline of the
flux. Two following nights did not confirm variability. It is most likely
a faint galaxy close to detection limit on single exposures.

I also looked at object reported by Castro-Tirado et al. (GCN#173)
at R.A. = 23 29 35.0, Dec = -23 55 42 (J2000). On averages of frames from
each night I can barely discern the object at estimated I = 21.4, close
to detection limit, however I don't see evidence for variability in my data.
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