Central Bureau for Astronomical Telegrams
IAUC 4058: SNe; EXO 1747-214; 2CG 195+04 (GEMINGA)
The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).
Read IAUC 4059
Circular No. 4058
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-495-7244/7440/7444
SUPERNOVAE
B. Leibungut and T. Albert report the discovery of supernova
1985I 2" west and 7" south of the nucleus of an anonymous galaxy
at R.A. = 13h46m03s, Decl. = +29deg46'7 (equinox 1950.0). The object was
found at Las Campanas on Apr. 28.22 UT at mag ~ 17.8 and confirmed
photographically on April 29.22 at mag ~ 17.5; on Apr. 19.2 it was
fainter than mag 20. The supernova may still be on the rise.
C. Wheeler, University of Texas, reports that spectrograms
obtained at McDonald Observatory on Apr. 16 by E. Barker and A.
Cochran in the blue and on Apr. 18 by H. Dinerstein and D. Garnett
in the red show that supernova 1985H (in NGC 3359) is of type II
about 60 days after maximum light. A spectrogram on Mar. 24 by
Dinerstein and Garnett shows that supernova 1985A (in NGC 2748) is
of type I, but the phase is uncertain pending reduction.
EXO 1747-214
A. N. Parmar, N. E. White, P. Giommi, L. Stella and M.
Sweeney, EXOSAT Observatory, report a new transient x-ray source
at R.A. = 17h47m25s0, Decl. = -21deg24'46" (equinox 1950.0; error radius
10"). Two type I x-ray bursts were seen during 8 hr of pointed
observation on Apr. 8 and 11. The source intensity was 0.07 Crab
with no obvious orbital modulation. The spectrum is a power law
with an energy index of 1.4 attenuated by 1.1 +/- 0.2 x 10**26 H/m**2.
M. Watson, Leicester University, reports that this source was also
active one year earlier during the EXOSAT galactic-plane survey.
2CG 195+04 (GEMINGA)
S. Kulkarni and S. Djorgovski, University of California at
Berkeley, report a search for time variability of the optical candidate
of the gamma-ray source 2CG 195+04 suggested by Caraveo et al.
(1984, Ap.J. 276, L45). For a sinusoidal modulation in the period
range 59.9-60.7 s the 3-sigma upper limit on the amplitude is 0.11
mag. The corresponding limit for the period range 59.5-61.05 s is
0.13 mag. For arbitrary periodic modulation, the 3-sigma upper limit
is 0.07 mag over the above period ranges. Over the time scales of
15 min to 3 hr the 3-sigma upper limit to variability is 0.18 mag.
All these limits refer to the epoch of 1985 Feb. 23 and 24 UT. On
time scales of 1 day to 3 months (1984 Nov. to 1985 Feb.) the 3-sigma
upper limit to variability is 0.30 mag.
1985 April 30 (4058) Brian G. Marsden
Read IAUC 4059
Our Web policy. Index to the CBAT/MPC/ICQ pages.
