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IAUC 6699: 1997cw; GEMINGA; CTA 102

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                                                  Circular No. 6699
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
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Phone 617-495-7244/7440/7444 (for emergency use only)


SUPERNOVA 1997cw IN NGC 105
     Q.-y. Qiao, Y.-l. Qiu, W.-d. Li, W. Zhou and J.-y. Hu, on behalf
of the Beijing Astronomical Observatory (BAO) Supernova Survey, report the
discovery of a supernova of mag about 16.5 on an unfiltered CCD frame
taken on July 10.79 UT with the BAO 0.60-m reflector.  A confirming image
obtained  on July 11.70 shows the object at mag about 16.4.  SN 1997cw is
located at R.A. = 0h25m17s.27, Decl. = +12d53'06".2 (equinox 2000.0), which
is 7".6 east and 4".2 north of the nucleus of NGC 105.  An unfiltered CCD
frame taken on 1996 Nov. 3 (limiting mag around 19.0) shows no star at this
position.  A low-resolution spectrum taken on July 11.8 by Qiu, Qiao, Li,
Hu and J.-y. Wei indicates that SN 1997cw is an SN 1991T-like peculiar type
Ia SN, near or soon after optical maximum.  The entire spectrum resembles
that of SN 1997br some three days after maximum.  Weak, yet conspicuous
Si II 635.5-nm absorption is present at 622 nm.  Strong Na D absorption
(equivalent width 3.7 nm) from the host galaxy suggests that the supernova
is seriously reddened by NGC 105.  There is also conspicuous H-alpha emission
from the host galaxy, for which they estimate the redshift to be about
4600 km/s.


GEMINGA
     H. O. Vats, M. R. Deshpande, C. Shah, A. K. Singal, K. N. Iyer, R.
Oza and S. Doshi, Physical Reasearch Laboratory, Ahmedabad, report the
detection of radio pulses on June 19 from Geminga = 1E 0630+178 at a period
of 237 ms, with a subpulse at 0.5 phase separation.  The observations were
made at 103 MHz using the 5000 sq. meter radio telescope at Rajkot.


CTA 102
     M. T. Carini and J. C. Noble, Western Kentucky University; H. R.
Miller, Georgia State University; and T. J. Balonek, E. Beckerman and
S. M. Davis, Foggy Bottom Observatory (FBO), Colgate University, report:
"We have obtained R-band observations of CTA 102 (cf. IAUC 5477) with
the 1.1-m Hall (H) telescope at the Lowell Observatory and the 0.4-m
telescope at FBO, in response to reports of a flare at millimeter
wavelengths: May 18, 16.31 +/- 0.05 (FBO); 19, 16.07 +/- 0.10 (H); 26,
15.98 +/- 0.05 (FBO); 27, 16.02 +/- 0.03 (H); 28, 16.17 +/- 0.05 (H);
29, 16.11 +/- 0.02 (H); June 4, 15.54 +/- 0.02 (FBO); 10, 15.29 +/- 0.03
(FBO); 11, 15.51 +/- 0.02 (FBO); 16, 15.59 +/- 0.03 (FBO)."

                      (C) Copyright 1997 CBAT
1997 July 12                   (6699)              Timothy B. Spahr

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