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IAUC 6203: C/1995 O1; 1995V; X-RAY N 1994 IN Sco

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                                                  Circular No. 6203
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
Phone 617-495-7244/7440/7444 (for emergency use only)

     C. Lidman and P. Bouchet, European Southern Observatory (ESO),
report observations of C/1995 O1 in the near infrared with the 2.2-
m telescope at La Silla (+ ESO IRAC2 camera with Nicmos3 array of
256x256 pixels; pixel size 0".52):  "The observations were centered
at Aug. 5.14 UT.  The following preliminary magnitudes (+/- 0.1 mag)
were obtained through a 10" aperture centered on the comet's
nucleus:  J = 11.2, H =11.2, K = 11.1.  The images show a clear
extension of the order of 1' toward the northwest, the coma size
being about 2".5 (seeing 0".8).  Notable is that the comet is
colorless in the near-infrared."

     D. Balam, Climenhaga Observatory, reports the following precise
position, obtained with the 0.5-m reflector (+ CCD):  R.A. =
2h46m26s.77, Decl. = -0o29'55".6 (equinox 2000.0), which is 23"
east and 0".2 south of the host galaxy's core.  Preliminary
photometry in Johnson V and Cousins I bands:  Aug. 4.47 UT, V =
15.68 +/- 0.09, V-I = +1.53 +/- 0.09 (comparison stars HD 18175, HD
18369).  A nearby star of similar brightness (V = 14.94 +/- 0.04,
V-I = +0.30 +/- 0.04) has position end figures 26s.75, 25'37".4.

     J. Orosz, B. Schaefer, and S. Barnes, Yale University, report:
"We have observed the superluminous gamma-ray source GRO J1655-40
with the Cerro Tololo 0.9-m telescope (+ CFCCD imager) from June 26
to July 3 and from Aug. 4 to 7 UT.  The source is currently almost
1 mag brighter in the V band than it was during the period Apr. 5-
24.  The average magnitude was V = 15.9 during each of the two
recent runs, compared to the average of V = 16.7 during April.
This increase in brightness may be related to the recent increase
in the hard x-ray activity (IAUC 6196 and 6201), but it should be
noted that our observations in Mar./Apr. (IAUC 6173) showed no
response to the hard x-ray outburst observed at that time (IAUC
6152).  The mean V-I color was +1.93 during each of the two recent
runs, a decrease of about 0.05 mag since Apr.  The June/July V
light curve, folded on the 2.6-day period (IAUC 6173), has a
similar shape as the folded Apr. V light curve, but with half the
amplitude.  Also, the modulation in V-I in June/July is only 0.04
mag, compared with 0.15 mag in Apr.  Additional observations are

1995 August 8                  (6203)            Daniel W. E. Green

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