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IAUC 5844: 1992bt; GRO J0422+32; 1993J

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                                                  Circular No. 5844
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 1992bt IN NGC 3780
   A. V. Filippenko, T. Matheson, and B. Leibundgut, University of
California at Berkeley, report that a CCD spectrum (range 310-1000
nm) obtained on Aug. 13 UT with the Shane 3-m reflector at Lick
Observatory shows that SN 1992bt (cf. IAUC 5841) is of type II.  The
object is in its nebular phase, with strong H-alpha emission and
weaker lines of [O I] 630-nm, [Ca II] 730-nm, and the Ca II near-
infrared triplet.


GRO J0422+32
     P. Garnavich, Dominion Astrophysical Observatory, writes: "CCD
photometry obtained at the Manastash Ridge Observatory of the
University of Washington gives the following preliminary V magnitudes:
Aug. 10.476 UT, V = 17.8 +/- 0.1; 11.470, 15.83 +/- 0.04; 12.455,
15.68 +/- 0.03; 13.490, 15.32 +/- 0.03.
     C. Chevalier and S. A. Ilovaisky, Observatoire de Haute-
Provence, report:  "CCD photometry of the optical counterpart of
the soft x-ray transient GRO J0422+32 was obtained with the OHP
1.2-m telescope from July 25 to Aug. 16.  When the object was faint,
we find V = 19.0 on July 26.1 UT and V = 19.2 on July 28.1.  Monitoring
in the Cousins I band started in August, yielding the following
preliminary magnitudes:  Aug. 7.1, 18.1; 8.1, 17.6; 9.1, 17.8;
12.1, 15.0; 13.1, 14.8; 14.1, 14.5; 16.1, 14.6.  Observations on
Aug. 16 yield V = 15.3, B-V = +0.5, V-Ic = +0.7."


SUPERNOVA 1993J IN NGC 3031
     G. F. Lawrence, A. Paulson, C. Mason, C. Butenhoff, and R. D.
Gehrz report the following infrared photometry of SN 1993J obtained
at the University of Minnesota 0.76-m telescope (+ InSb photometer;
standard infrared photometric techniques employed with a 27" beamsize
and typically a 44" north/south throw; calibration was against
IRTF standard stars):  Apr. 3.4 UT, J = 10.91 +/- 0.05, H = 10.66
+/- 0.05, K = 10.36 +/- 0.08; 21.2, 10.01 +/- 0.05, 10.00 +/- 0.05,
9.80 +/- 0.05; 22.2, 10.05 +/- 0.03, 9.97 +/- 0.03, 9.85 +/- 0.03;
May 13.3, 10.92 +/- 0.02, 10.48 +/- 0.03, 10.48 +/- 0.03; June 22.2,
12.45 +/- 0.09, 11.69 +/- 0.06, 11.20 +/- 0.09; July 7.2, 13.03 +/-
0.15, 12.13 +/- 0.07, 11.73 +/- 0.12; 15.2, 12.92 +/- 0.09, 12.51
+/- 0.06, 11.89 +/- 0.10.  Note that on IAUC 5757 the authors
incorrectly reported the K magnitude for Apr. 3.4 as 10.48.


1993 August 17                 (5844)            Daniel W. E. Green

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