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IAUC 5879: 1993ac; SNR G10.0-0.3; GRO J0422+32

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                                                  Circular No. 5879
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


SUPERNOVA 1993ac IN ANONYMOUS GALAXY
     Jean Mueller reports her discovery of a supernova (mag about
18) on a IIIa-J plate taken by herself on Oct. 13 UT with the 1.2-m
Oschin Schmidt Telescope in the course of the second Palomar Sky
Survey.  The new object is located 4" west and 31".6 north of the
nucleus of a galaxy at (R.A. = 5h41m.5, Decl. = +63o20', equinox
1950.0).  A spectrogram obtained by S. G. Djorgovski and D. Thompson
on Oct. 14 with the 5-m Hale telescope (+ double spectrograph) shows
broad Balmer emission lines with P-Cyg profiles and a very blue
continuum.


SNR G10.0-0.3
     S. Kulkarni, California Institute of Technology; D. Frail,
National Radio Astronomy Observatory; N. Kassim, Naval Research
Laboratory; T. Murakami, Institute for Space and Astronautical
Science; and G. Vasisht, California Institute of Technology, write:
"We have obtained multi-band images from data obtained at the Very
Large Array on Sept. 13 of the supernova remnant (SNR) G10.0-0.3,
which we had earlier claimed to be associated with the soft gamma
repeater SGR 1806-20 (Kulkarni and Frail 1993, Nature 365, 33).
The new images show a compact nebula superposed on an extended
plateau emission.  The morphology is suggestive of a plerion (i.e.,
a pulsar-powered SNR).  The centroid of the compact nebula, the
most likely position of the putative pulsar, is at R.A. =
18h05m41s.76, Decl. = -20o25'13" (equinox 1950.0).  Since plerions
are quite rare, the association of SNR G10.0-0.3 with SGR 1806-20
should now be taken seriously.  We speculate that the seat of the
SGR activity lies in this compact nebula.  Given that SGR 1806-20
is currently active (IAUC 5875), we urge multiwavelength --
especially infrared (to minimize extinction) and x-ray --
observations towards this position."


GRO J0422+32
     P. Zhao, P. Callanan, M. Garcia, and J. McClintock, Smithsonian
Astrophysical Observatory, communicate:  "GRO J0422+32 has declined
rapidly since Sept. 20.  CCD photometry obtained at the F. L.
Whipple Observatory 1.2-m telescope gives the following R
magnitudes: Sept. 21.47 UT, 17.75 +/- 0.02; 22.47, 17.84 +/- 0.02;
23.49, 18.19 +/- 0.02; Oct. 3.42, 18.75 +/- 0.08; 8.451, 18.72 +/-
0.02; 8.464, 18.71 +/- 0.02."


1993 October 14                (5879)            Daniel W. E. Green

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