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IAUC 4374: 1987F; 1987E; 1987A

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IAUC number

                                                  Circular No. 4374
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

     P. Wild, Astronomical Institute, Berne, reports the discovery
by T. Schildknecht on Apr. 23 of a supernova (mpv = 15.8) in NGC
4615 (R.A. = 12h39.1, Decl. = +26 20', equinox 1950.0).  The object is
located 24" east and 6" south of the galaxy's nucleus; it was
confirmed on Apr. 24.

     M. Rosa, European Southern Observatory, reports the following
improved measurement for the SN:  R.A. = 12h49m49.4 (+/- 0s.5), Decl. =
+25 35'40" (+/- 1"), equinox 1987.5.  Improved reduction of CCD
frames (cf. IAUC 4373) yields the following photometry:  Apr. 24.21
UT, V = 15.65, B-V = +1.50 (+/- 0.05); 25.14, 15.70, +1.60.
     M. Koishikawa, Ayashi Station, Sendai Observatory, reports
that a patrol camera plate taken on Apr. 3.680 UT (20-min exposure)
shows no stellar object brighter than mag 16.5 in the position of
the reported SN.

     D. K. Aitken and C. H. Smith, University College, Australian
Defence Force Academy, Canberra; and P. F. Roche, Royal Observatory,
Edinburgh, report:  "We have obtained 8- to 13-micron spectrophotometry
of SN 1987A (resolution 0.09 micron) using the Anglo-Australian
telescope on Apr. 18 and 19.  The spectrum is well fit by a smooth
continuum of color temperature 1300 (+200, -150) K and flux 50 Jy at 10
microns.  Emission from H(7-6) (4.5 x 10E-18 W/cm2) and H(9-7) (1.8 x
10E-18 W/cm2) is observed with pronounced red wings extending at
half-height to +6500 and +4300 km/s, respectively."
     Further provisional photoelectric photometry by A. Beresford,
Adelaide, N.S.W. (0.2-m reflector):  Apr 25.47, V = 3.12, B-V =
+1.60.  Corrigendum:  On IAUC 4369, line -3, for  Apr. 17.4 UT
read  Apr. 16.4 UT.
     Further visual magnitude estimates:  Apr. 23.40 UT, 3.1 (R. H.
McNaught, Siding Spring Observatory); 24.42, 3.0 (G. Garradd,
Tamworth, N.S.W.); 25.34, 3.2 (D. A. J. Seargent, The Entrance,
N.S.W.); 25.36, 3.1 (McNaught); 27.02, 3.2 (V. F. de Assis Neto,
Sao Francisco de Oliveira, Brazil).

1987 April 27                  (4374)            Daniel W. E. Green

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