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IAUC 7394: 2000au; 2000bg; XTE J1118+480

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IAUC number

                                                  Circular No. 7394
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 2000au IN MCG +8-15-14
     S. Jha, P. Challis, and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report that spectra of SN 2000au (cf. IAUC
7389), taken by W. Brown on Mar. 31.25 and Apr. 3.13 UT with the
F. L. Whipple Observatory 1.5-m telescope (+ FAST spectrograph),
show it to be a type-II supernova after maximum light, with broad,
well-developed Balmer lines and Fe II.  Superimposed narrow H-alpha
emission yields a recession velocity of 5900 km/s for the host
galaxy.  The H-alpha P-Cyg profile yields an unusually high
expansion velocity for the supernova of 10 900 km/s.

SUPERNOVA 2000bg IN NGC 6240
     Jha et al. also report that spectra of SN 2000bg (cf. IAUC
7392), taken as above by Brown on Apr. 3.51 and 4.48 UT, show it to
be a type-IIn supernova at an early epoch.  The spectra exhibit a
blue continuum with a broad H-alpha emission profile (FWHM = 10 000
km/s) as well as narrow (FWHM < 300 km/s) H-alpha and [N II]
emission.  The narrow emission lines yield a recession velocity of
7180 km/s for the host galaxy.  The spectra also show narrow
interstellar Na I D absorption (EW = 0.50 nm), at the host-galaxy
redshift, indicating significant dust absorption.

XTE J1118+480
     S. Chaty and C. A. Haswell, Open University; G. P. Smith and
I. Smail, Durham University; and R. I. Hynes, Southampton
University, report the following near-infrared photometry of the
counterpart to the x-ray transient XTE J1118+480 (IAUC 7389),
obtained with the 3.8-m U.K. Infrared Telescope (+ UFTI
instrument):  Apr. 4.2 UT, J = 12.12 +/- 0.02, H = 11.75 +/- 0.02,
K = 11.06 +/- 0.02.
     J. Wren, Los Alamos National Laboratory (LANL); and T. McKay,
University of Michigan (UM), on behalf of the ROTSE collaboration
(UM/LANL/Lawrence Livermore National Laboratory), report the
following magnitudes for the optical counterpart of XTE J1118+480,
obtained with the ROTSE-I telescope; all observations were
performed using an unfiltered CCD, and magnitudes are calibrated to
approximately the V-band (with an uncertainty of 0.1 mag):  1999
Dec. 18.315 UT, [15.3; 28.283, [14.6; 2000 Jan. 4.223, 13.33 +/-
0.08; 12.194, 13.10 +/- 0.02; 31.143, 14.30 +/- 0.08; Feb. 3.147,
14.35 +/- 0.08; 8.150, 15.10 +/- 0.18; 15.312, [15.0; 23.185,
[14.8; 26.299, 14.82 +/- 0.12; 29.265, 13.79 +/- 0.04; Mar. 5.322,
13.33 +/- 0.03; 12.325, 13.14 +/- 0.02; 28.206, 13.11 +/- 0.03.

                      (C) Copyright 2000 CBAT
2000 April 5                   (7394)            Daniel W. E. Green

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