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GCN Circular 120

Subject
SGR1900+14 field optical observations
Date
1998-06-30T17:05:16Z (26 years ago)
From
Arne A Henden at USNO/USRA <aah@nofs.navy.mil>
A. Henden, C. Luginbuhl and F. Vrba (U.S. Naval Observatory Flagstaff
Station) report that they have obtained extensive I-band and J-band
observations of the near-IR sources and surrounding field associated
with SGR1900+14 both before and after the recent onset of activity.
None of the observations coincide with bursts detected by BATSE, and no
unusual photometric behavior has been detected though reductions are
ongoing.  A new eclipsing binary has been detected nearby, however, at
RA 19:07:16.85 DEC +09:18:50.4 (J2000), about 39.0 arcseconds SE of
the M supergiant pair.  The binary is about I=19.1 out of eclipse,
and has been observed through several eclipses of about 0.4mag depth.
The period is either about 1.07day or some integer fraction.
This binary appears as the star labelled 'J' in Figure 1 of
Vrba et. al. ApJ 468:225 (1996).  We bring this star to the attention of
other observers in the hope that it not send anyone on a wild goose
chase if it is detected as a variable in observations of this
gamma-ray burst location.

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