Central Bureau for Astronomical Telegrams
IAUC 4452: 1987A; OS And (N And 1986)
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Circular No. 4452
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
U. G. Briel, E. Pfeffermann, B. Aschenbach, H. Brauninger and
J. Trumper, Max-Planck-Institut fur Extraterrestrische Physik,
write: "We searched for soft x-ray emission (0.2-2.1 keV) in SN
1987A on Aug. 24.69 UT using an imaging telescope with a position-
sensitive proportional counter on a sounding rocket flight from
Woomera, Australia. No signal was detected from the supernova
within a 1'.5-square detection cell during the 220-s observation,
corresponding to an upper limit of 0.16 mCrab (95 percent confidence).
Assuming an absorption column density of 4 x 10**20 cm-2,
this countrate is equivalent to 10**-12 erg cm-2 s-1 keV-1 at 1 keV
(95 percent confidence) or 1.5 x 10**36 erg/s in soft x-rays for a
source temperature between 0.1 and 10 keV, or a source power-law
spectrum with a photon number index between 0 and -3."
E. P. Ney, University of Minnesota, communicates the following
photometric observations, made by T. F. Flowers with the
Australian National University's O.41-m reflector at Siding Spring
Observatory around the time of maximum light (uncertainty +/- 0.03
in V and B-V, +/- 0.07 in U-B): May 20.39, V = 3.06, B-V = +1.32,
UB = +2.54; 21.43, 3.07, +1.31, +2.52; 22.35, 3.03, +1.34, +2.40;
22.43, 3.07, +1.31, +2.47; 23.35, 3.02, +1.35, +2.40; 23.43, 3.08,
+1.30, +2.47; 24.35, 3.03, +1.33, +2.41; 24.43, 3.07, +1.35,
+2.34; 25.35, 3.02, +1.36, +2.40.
Visual magnitudes by A. C. Beresford, Adelaide, S. Australia:
Sept. 20.52 UT, 5.2; 21.50, 5.2; 22.51, 5.2.
OS ANDROMEDAE (NOVA ANDROMEDAE 1986)
Photoelectric photometry by R. Monella, Covo, Italy: July
16.976 UT, V = 12.65, B-V = +0.39, U-B = -0.84; 18.972, 12.73,
+0.43, -0.89; 19.985, 12.84, +0.51, -0.88.
Visual magnitude estimates: July 4.05 UT, 12.7 (S. Korth,
Dusseldorf, West Germany); 6.04, 12.6 (P. Schmeer, Bischmisheim,
West Germany); 10.94, 12.6 (A. Boattini, Florence, Italy); 16.92,
12.9 (Boattini); 28.04, 12.7 (Schmeer); Aug. 6.97, 12.7 (Korth);
17.00, 12.6 (Schmeer); 19.88, 13.0 (Boattini); 24.90, 12.9 (R.
Monella, Covo, Italy); 26.91, 12.9 (Monella); 28.92, 13.0 (Monella);
28.88, 12.8 (M. Verdenet, Bourbon-Lancy, France); 30.94, 13.0
(Verdenet); Sept. 16.04, 13.3 (Schmeer).
1987 September 22 (4452) Brian G. Marsden
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