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IAUC 3584: SN IN NGC 4536

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                                                  Circular No. 3584
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 617-864-5758

     Several observers have reported spectroscopic observations of
the supernova in NGC 4536, all noting deep absorption at 615.0 nm
during Mar. 9-11, indicating a type I supernova just past maximum
light.  These observers include: 1) G. Vettolani, Institute of Radio
Astronomy, and B. Marano and V. Zitelli, Astronomical Observatory,
University of Bologna (observation Mar. 10 with the Loiano Observatory
1.52-m telescope); 2) P. Rafanelli, K. Birkie and H.
Hefele, Max-Planck-Institut fur Astronomie, Heidelberg, and Centro
Astronomico Hispano-Aleman, Calar Alto (spectroscopic and near-infrared
photometric observations with the Calar Alto 1.2- and 2.2-m
telescopes on Mar. 10 and 11 revealed emission bands centered at
455.0, 515.0, 540.0, 560.0 and 640.0 nm and the following magnitudes
at 4h UT on the latter date: J = 12.7, H = 13.0, K = 12.6);
3) R. Barbon, F. Clatti and L. Rosino, Asiago Astrophysical Observatory
(a grating spectrogram obtained Mar. 10 reveals broad features
at 460.0 and 520.0 nm); 4) Kriss and Berg, McGraw-Hill Observatory
(observations Mar. 9 and 11 indicated V ~ 12; communicated by R.
Kirshner, Department of Astronomy, University of Michigan).
     N. Panagia and W. Wamsteker, on behalf of the European Space
Agency/U.K. Science Research Council Team for Supernova Observations,
telex: "Low-resolution spectrograms of the supernova in NGC
4536 have been obtained at Villafranca with the IUE.  Long-wavelength
spectra observed on Mar. 9, 10 and 11 are similar to those
observed of the Wischnjewsky supernova in NGC 1316 (cf. IAUC 3556),
agreeing with a type-I classification; one short-wavelength spectrogram
also was obtained on Mar. 10.  Fine-error-sensor magnitudes on
Mar. 9.2, 10.4 and 11.5 UT were, respectively, 12.01, 12.04 and
12.14.  Cursory inspection shows a spectrum steeply decreasing from
300.0 nm towards shorter wavelengths.  Broad (5.0-10.0-nm-wide)
emission features appear at 315.0, 294.0, 254.0, 232.0, 196.0,
174.0 and possibly 166.0 nm.  A. C. Danks reports that optical spectrograms
taken Mar. 10 and 11 by P. Veron with the European Southern
Observatory's 1.5-m telescope, covering 408.0-725.0 nm, also
show broad (19.0-nm) emission features at 461.4, 520.2, 566.9 and
636.4 nm.  On-line magnitudes obtained by M. Veron with ESO's 1-m
telescope on Mar. 12d05h30m UT: V = 11.91, B-V = +0.16, U-B = -0.18."
     S. P. Tokarz and C.-Y. Shao, Center for Astrophysics, report
that a prediscovery plate (cf. IAUC 3583) shows this object at mpg
~ 13.4 on Feb. 28.249 UT.  A subsequent plate taken at Agassiz station
on Mar. 11.271 shows the supernova at mpg ~ 12.2.

1981 March 17                  (3584)              Daniel W. E. Green

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