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IAUC 5990: 4U 0115+634; 1994I; OJ 287

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                                                  Circular No. 5990
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)


4U 0115+634
     D. M. Scott, M. H. Finger, R. B. Wilson, and T. A. Prince
report for the Compton Gamma Ray Observatory BATSE pulsar team:
"Pulsed hard x-ray flux in the energy range 20-70 keV is currently
being detected from the x-ray binary 4U 0115+634.  This is the
second outburst of this source observed by BATSE, the first
occurring in April 1991.  In the current outburst, pulsed flux was
first detected on 1994 May 8.  An intrinsic pulse period of
3.6145107 +/- 0.0000010 s and a period derivative of (5.9 +/- 1.9)
x 10E-11 were determined for epoch May 13.0 UT.  The phase-averaged
pulsed flux, averaged over 20-40 keV, was about 45 mCrab (total) on
May 15.  The spectrum is well fit by an optically thin thermal
bremsstrahlung model A/E exp(-kT), with kT = 16 +/- 4 keV, and a
flux at 35 keV of (2.0 +/- 0.2) x 10E-4 photon cmE-2 sE-1 keVE-1."


SUPERNOVA 1994I IN NGC 5194
     T. Tongue, M. Graham, M. Stanley, L. Truesdell, and D.
Westpfahl, New Mexico Institute of Mining and Technology, report a
pre-supernova radio continuum observation of NGC 5194 using the
Very Large Array on Feb. 12 (49 days before the first optical
detection):  "Using the continuum channels of a 21-cm spectral line
observation, with baselines out to 50 000 wavelengths, we report a
nondetection with a 3-sigma upper limit of 2.3 mJy at the position
of the supernova.  The upper limit is based on both random and
systematic (calibration) errors; the rms noise of the continuum
image was 0.75 mJy/beam.  A nondetection at this level suggests
that the progenitor star did not produce bright radio continuum
emission from pre-explosion ejecta on timescales of a few months
prior to the explosion and was not associated with a radio-bright
H II region."
     CCD photometry by H. Mikuz, Ljubljana, Slovenia (cf. IAUC
5972):  May 3.99 UT, V = 14.43 +/- 0.03, B-V = +0.69 +/- 0.05.


OJ 287
     H. Meusinger, Thuringer Landessternwarte, Tautenburg, reports
the following photographic B magnitudes of OJ 287 (cf. IAUC 5909)
from Tautenburg Schmidt plates (emulsion ORWO ZU, filter GG13):
Feb. 14.9 UT, 16.1; Mar. 10.9, 16.0; Apr. 5.8, 15.2; 14.9, 15.75;
May 2.9, 16.0; 7.9, 15.3; 9.9, 15.6; 13.9, 15.7.


1994 May 18                    (5990)            Daniel W. E. Green

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