Central Bureau for Astronomical Telegrams
IAUC 4332: 1987A; AE 1
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 4333
Circular No. 4332
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
SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
With further reference to IAUC 4323, C. Castagnoli, Istituto
di Cosmogeofisica, Turin, communicates the following times (in
seconds after Feb. 23d02h52m UT) and energies (in MeV) for the
five neutrino pulses detected at the Mont Blanc Neutrino Observatory:
36.792, 7; 40.649, 8; 41.007, 11; 42.696, 7; 43.800, 9. The
middle interaction was accompanied by a 1.2-MeV pulse 278 microseconds
later. These times are 5 min earlier than was originally reported.
W. Brinkmann, Max-Planck-Institut fur Extraterrestrische
Physik, reports: "In an EXOSAT observation of N157B on 1984 Oct.
20 the position of SN 1987A was close to the center of the field
of view. No x-ray flux was detected in a 5-hr pointing of the LE
telescope using the CMA detector with the thin Lexan filter. For
a thermal spectrum the 2 sigma upper limit of 2 x 10**-3 cts/s
corresponds to a luminosity limit between 10**35.2 erg/s (for kT = 1 keV)
and 10**37 erg/s (for kT = 7 keV), assuming values for the interstellar
absorption of nH = 10**22 to 10**23 cm-2, thus ruling out a
luminous presupernova x-ray state at the time of observation."
N. Suntzeff, Cerro Tololo Interamerican Observatory, provides
the following continuation to the photometry published on IAUC
4328: Mar. 3.125 UT, V = 4.51, B-V = +0.89, U-B = +1.26; 4.120, V
= 4.47, B-V = +0.99, U-B = +1.41. He also gives Cousins-system
red data for these and the earlier nights: Feb. 25.221 UT, V-R =
+0.29, U-B = -0.03; 26.120, +0.33, 0.00; 27.081, +0.38, +0.07;
28.130, +0.42, +0.06; Mar. 1.116, +0.44, +0.08; 2.110, +0.46,
+0.10; 3.125, +0.45, +0.11; 4.120, +0.46, +0.12. Dispersions
are generally +/- 0.01 to +/- 0.02 mag. The nights of Mar. 1 and 2
were not fully photometric.
AE 1
S. O. Kepler, Instituto de Fisica, Universidade Federal do Rio
Grande do Sul, telexes: "We have found short-timescale variations
in the strange blue, pure-He I-spectrum object AE 1. In addition
to a variation from V = 13.5 to V = 17.0 over a few days, the object
exhibits light variations of 1 percent with a period of 536 s,
plus variations of smaller amplitude on timescales of 400-800 s.
Elvius (1975, A. Ap. 44, 117) gives a finding chart. The object
is probably similar to the double degenerate PG 1346+082."
1987 March 6 (4332) Brian G. Marsden
Read IAUC 4333
Our Web policy. Index to the CBAT/MPC/ICQ pages.
