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IAUC 6104: X-RAY N 1993 IN Oph; OJ 287; 3C 66A

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                                                  Circular No. 6104
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
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     TWX 710-320-6842 ASTROGRAM CAM
MARSDEN@CFA.HARVARD.EDU or GREEN@CFA.HARVARD.EDU (science)


X-RAY NOVA 1993 IN OPHIUCHUS
     B. A. Harmon, S. N. Zhang, W. S. Paciesas, C. A. Wilson, and
G. J. Fishman report for the Compton Observatory BATSE Team:  "This
object (GRS 1716-249 = GRO J1719-24) has gradually brightened since
the reported detection in early September by GRANAT/Sigma (IAUC
6083) to about 300 mCrab in the band 20-100 keV, as of Nov. 7.  The
spectrum hardened steadily from early September to about Sept. 30,
with power-law spectral index (20-100 keV) increasing from -2.5 to
-1.8.  In October, the spectrum was marginally softer, with index
-2.2 to -2.4.  The spectrum shows a steepening above 100 keV and
extends to at least 200 keV.  The light curve, spectrum, and
spectral evolution are similar to a long-lived secondary maximum
detected in June-September 1991 for Nova Mus 1991 (Paciesas et al.
1994, AIP Conf. Proc. 308, 115); however, there is no clear peak in
the light curve of the x-ray nova in Ophiuchus at this time.  We
note that this outburst follows the initial outburst in September
1993 (IAUC 5874) by about 11 months."


OJ 287
     M. Fiorucci and G. Tosti, Department of Physics, University of
Perugia, report that their further photometry confirms that this
object is at its brightest level since 1984 (cf. IAUC 6095):  Oct.
13.15 UT, V = 14.25; 14.11, 14.29; 15.16, 14.56; 16.12, 14.35;
18.17, 14.54; 19.13, 14.44; 25.13, 14.39; 31.14, 14.33; Nov. 5.15,
14.63; 12.08, 14.11.  They also note the presence of oscillations
having amplitudes of about 0.5 mag in V and durations of few days.
Additional photometry communicated by T. Pursimo, P. Heinamaki, H.
Lehto, A. Sillanpaa, and L. Takalo (Tuorla Observatory); and J. A.
de Diego, M. Kidger, and I. Vidal (Instituto de Astrofisica de
Canarias), made partly with Indiana University's Automatic RoboScope
telescope:  Nov. 6.01 UT, V = 14.08; 6.44, 14.14; 8.47, 14.21;
10.45, V = 13.99, R = 13.60, I = 13.02 (P. Boltwood, Canada);
11.08, 14.02, -, -; 11.26, 13.99, 13.56, 13.01; 11.39, 13.97, -, -.


3C 66A
     Additional V photometry (cf. IAUC 6095) by Fiorucci and
Tosti:  Oct. 13.10 UT, 14.28; 13.98, 14.48; 14.02, 14.50;  15.09,
14.47; 16.05, 14.51; 18.12, 14.22; 19.00, 14.20; 22.93, 14.16;
25.06, 14.34; 25.90, 14.37; 27.84, 14.02; 30.86, 14.11; Nov. 3.06,
13.81; 4.97, 14.06; 12.06, 13.89.


1994 November 14               (6104)            Daniel W. E. Green

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