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IAUC 5861: N IN M31; GALACTIC CENTER; YY Her

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                                                  Circular No. 5861
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


NOVA IN M31
     R. R. Treffers, A. V. Filippenko, B. Leibundgut, Y. Paik, L.
F. M. Lee, and T. Matheson, University of California at Berkeley;
and M. W. Richmond, Princeton University, report their discovery of
a nova in M31 (R.A. = 0h40m00s, Decl. = +40 59'.7, equinox 1950.0).
The object was found during the Leuschner Observatory Supernova
Search, which uses an automated 0.76-m telescope equipped with the
Lawrence Berkeley Laboratory CCD camera.  It was detected in an
image obtained on Aug. 27 UT, at R = 15.9 +/- 0.3, located about
10" east and 101" south of the nucleus (or 8" east and 14" south of
a nearby star).  Confirmation was made on Aug. 29 with the 0.50-m
Berkeley Automatic Imaging Telescope, but the nova had already faded
to R = 16.8 +/- 0.3.  No object appears at this position to limits
of R = 16.3, 16.2, and 15.9 in images obtained on Aug. 18, 21,
and 24, respectively.  A noisy spectrum (range 310-1000 nm) obtained
on Sept. 12 with the Shane 3-m reflector at Lick Observatory
reveals unusually broad H-alpha and H-beta emission lines (FWHM
about 4400 km/s) superposed on a weak continuum.


GALACTIC CENTER
     R. Sunyaev, E. Churazov, B. Cordier, and M. Denis, on behalf
of the GRANAT team (Space Research Institute, Moscow; Service
d'Astrophysique, Centre d'Etudes de Saclay; Centre d'Etude Spatiale des
Rayonnements, Toulouse), report:  "On Aug. 28, GRANAT started a new
set of Galactic Center observations in hard x-rays.  The observations
were performed on, or are planned for, Aug. 28, 29, and 31,
Sept. 1, 2, 4, 5, 6, 8, 9, 10, 12, 13, 14, 17, 18, 25, 26, 29, and
30, and Oct. 3 and 4 (and probably a few days more).  Preliminary
analysis revealed the following sources in 35- to 100-keV images,
averaged over the period Aug. 28-Sept. 3:  1E 1740.7-2942 at a
level of 100 +/- 5.4 mCrab; GRS 1758-258, 53 +/- 7.1 mCrab; GX 1+4,
48.7 +/- 7.1 mCrab; GX 354-0, 34.5 +/- 6.62 mCrab."


YY HERCULIS
     Visual magnitude estimates (cf. IAUC 5805):  June 16.85 UT,
11.6 (A. Boattini, Florence, Italy); 30.07, 11.7 (P. Schmeer,
Bischmisheim, Germany); 30.96, 11.4 (E. Schweitzer, Strasbourg,
France); Aug. 9.91, 11.7 (A. Pereira, Cabo da Roca, Portugal);
Sept. 9.86, 11.6 (Pereira).


1993 September 13              (5861)            Daniel W. E. Green

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