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IAUC 6605: 1997bl; GS 1843+00; GRO J0422+32

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                                                 Circular No. 6605
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/cfa/ps/cbat.html
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     Delphine Hardin reports the discovery on Mar. 7 of a supernova
(mag V about 21.5), found in the course of a systematic CCD search
by the EROS team with the Marly 1-m telescope at the European
Southern Observatory.  SN 1997bl is located at R.A. = 12h40m21s.0,
Decl. = -11o44'39" (equinox 2000.0), which is 2" from the center of
the host galaxy.  A spectrogram obtained by M. T. Ruiz on Mar. 16
with the ESO 3.6-m telescope indicates this to be a type-I supernova.

GS 1843+00
     D. Chakrabarty, Massachusetts Institute of Technology; T.
Takeshima, Goddard Space Flight Center, NASA, and Universities
Space Research Association; and R. B. Wilson, Marshall Space Flight
Center, NASA, report:  "Scans of the region containing this
accreting x-ray pulsar (IAUC 6585, 6595), using the PCA detectors
on the RXTE spacecraft on Mar. 16.04 UT, have yielded the following
improved position for the x-ray source:  R.A. = 18h45m.6, Decl. =
+0o50' (equinox J2000.0).  The error radius of 2' (90-percent
confidence) is dominated by systematic uncertainty due to source-
intensity variations during the scans.  Optical observations of
this region to identify the mass donor are encouraged.
Observations with the RXTE All Sky Monitor and the BATSE detectors
on the Compton Gamma Ray Observatory indicate that the x-ray source
was still active as of Mar. 23."

GRO J0422+32
     A. Iyudin and F. Haberl, Max-Planck-Institut fur
Extraterrestrische Physik, report:  "The x-ray nova known as GRO
J0422+32 (IAUC 5580, 5582) was detected again by the All-Sky
Monitor (ASM) on RXTE during the time period 1996 Nov. 18-1997 Jan.
15.  The source flux was 4.4 mCrab in the energy band 2-10 keV,
assuming a Crab-like power-law spectrum.  The data were analyzed
from the publicly available ASM quick-look results provided by the
ASM/RXTE team (http://heasarc.gsfc.nasa.gov/docs/xte/ASM).  The
repeated outburst of GRO J0422+32 happened at a time consistent
with the expected outburst period of about 120 days, suspected on
the basis of earlier x-ray (BATSE, ASCA; cf. IAUC 5851) and
optical measurements (Chevalier and Ilovaisky 1995, A.Ap. 297,
103).  The repetition of the nova outburst indicates similarities
between GRO J0422+32 and low-mass binary systems such as Aql X-1."

                      (C) Copyright 1997 CBAT
1997 March 27                  (6605)            Daniel W. E. Green

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