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IAUC 4534: 1988A; Poss. SNe; 1987A; 1988a

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IAUC number

                                                  Circular No. 4534
Central Bureau for Astronomical Telegrams
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

     C. Pollas, CERGA Observatory, Caussols, reports his independent
discovery of this object on a red plate exposed Jan. 22.19 UT;
the SN (V = 15.5) is 47" south and 3" east of the galaxy's nucleus.
     A. V. Filippenko, University of California at Berkeley,
communicates: "R. D. Cohen and V. T. Junkkarinen, University of
California at San Diego, used a Cassegrain CCD spectrograph on the
Shane 3-m reflector at Lick Observatory to obtain a spectrum (range
430-710 nm, resolution 1.5-2 nm) of SN 1988A on Jan. 22.  A verbal
description of the spectrum suggests that it is a type-II SN.
Strong, broad H-alpha emission is present, and P-Cyg profiles are visible
near the nominal positions of Na I D (589 nm) and H-beta (486 nm)."

Corrigendum:  On IAUC 4533, "Possible Supernova in NGC 3191", line
   3, for  +46 23'  read  +46 43'
     C. Pollas, CERGA Observatory, Caussols, reports his discovery
on a Schmidt plate of a possible supernova in UGC 3933 (A0734+42;
R.A. = 7h34m10s, Decl. = +42 04.0, equinox 1950.0).  The object is
located 21" east and 10" north of the galaxy's center, with mv = 17.

     M. Hamuy and M. Phillips, Cerro Tololo Interamerican Observatory,
telex:  "From our UBVRI monitoring program of SN 1987A using
the CTIO 0.4-m telescope, we report that after a long period of
nearly constant magnitude, the U-band brightness started to decrease
around 1987 Dec. 22.  However, no significant departure from
a linear decline rate has been detected in the other bands.  This
drop in U amounts to some 0.06 mag between Dec. 22 and 1988 Jan.
20.1 UT.  Measurements obtained for the latter date are as follows:
V = 6.40, B-V = +1.08, U-B = +1.32, V-R = +1.20, R-I = +0.18."

     Total visual magnitude estimates (cf. IAUC 4528):  Jan. 14.48
UT, 10.2 (R. H. McNaught, Siding Spring Observatory, 20x120 binoculars);
15.46, 9.6 (G. Garradd, Tamworth, N.S.W., 0.15-m reflector);
21.09, 9.1 (A. Hale, Las Cruces, NM, 0.41-m reflector).

1988 January 23                (4534)            Daniel W. E. Green

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