Central Bureau for Astronomical Telegrams
IAUC 5294: 1991ae; GRS 0834-430; 3C 345
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Circular No. 5294
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 or GREEN@CFA.BITNET MARSDEN or GREEN@CFAPS2.SPAN
SUPERNOVA 1991ae IN MCG +11-19-018
A. V. Filippenko, University of California at Berkeley, reports:
"M. Dickinson and D. Schlegel, also of Berkeley, obtained a
CCD spectrum of SN 1991ae on June 12 UT with the Shane 3-m reflector
at Lick Observatory. The classification of peculiar type II is
confirmed, and the spectral appearance is very similar to that of SN
1987B at early times; see Figure 1.22 in A. G. Petschek (1990,
Supernovae, Springer Verlag, New York). However, SN 1987B did not
seem to exhibit the weak, unresolved absorption lines present in SN
1991ae (cf. IAUC 5287)."
GRS 0834-430
S. Grebenev and R. Sunyaev, on behalf of the GRANAT team,
report: "The GRS 0831-429 (IAUC 5122) field was observed on May 28.7
UT during a 1-hr exposure. The ART-P telescope detected only GRS
0834-430, the southern of two sources observed in that field by
ROSAT, GINGA, and GRANAT (IAUC 5139, 5142, 5180). This source was
found in a bright state; its 6- to 30-keV flux was at the level of
250 mCrab. The source spectrum was hard, with photon index about
1.65. We detected strong pulsations with a barycentric period of
12.3167 +/- 0.0006 s. It is obvious that GRS 0834-430 was the
source of these pulsations, as first found by GINGA (IAUC 5139,
5148). The period derivative, estimated in the assumption of a
steady spin-up during the interval between these and previous (IAUC
5180) ART-P observations, was equal to -(7.8 +/- 0.4) x 10E-10. The
3-sigma upper limit on the flux from the northern source (MX
0836-42) in the same field was equal to 30 mCrab. The 1991 May
outburst was the third bright outburst observed from the GRS 0834-430
field during 1990-1991 (cf. IAUC 5122, 5180)."
3C 345
A. Sadun and E. Hertz, Agnes Scott College, write: "We confirm
elevated fluxes (cf. IAUC 5281) and report the following magnitudes
obtained with the Lowell Observatory 1.1-m telescope: May 25.20 UT,
V = 16.69, V-R = +0.20, R-I = +0.64; May 25.35, 16.89, +0.33, +0.67;
May 27.20, 16.75, +0.26, +0.59; May 27.30, 16.76, +0.24, +0.58."
1991 June 18 (5294) Daniel W. E. Green
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