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IAUC 6950: 1998co; 1998cn; SGR 1627-41

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IAUC number

                                                 Circular No. 6950
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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SUPERNOVA 1998co IN NGC 7131
     Wayne Johnson, Anza Observatory, reports his discovery of a
supernova (mag 16) on CCD images obtained on June 21 and 22 with
the Orange County Observers' 0.56-m telescope.  SN 1998co is
located 3" east and 5" north of nucleus of NGC 7131 (R.A. =
21h47m.7, Decl. = -13o11', equinox 2000.0).
     P. Garnavich, S. Jha, and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, report that a spectrum of SN 1998co,
obtained by M. Calkins with the Fred L. Whipple Observatory (FLWO)
1.5-m telescope on June 23.4 UT, shows strong Si II absorption with
a minimum at 623.63 nm and is clearly that of a type-Ia supernova
near maximum.  The NASA Extragalactic Database gives a redshift for
NGC 7131 of 5458 km/s, so that the atmospheric expansion velocity
is 10 300 km/s.  CCD imaging from the FLWO 1.2-m telescope gives an
offset of the supernova from the galaxy nucleus of 2".4 east and
4".6 north.

SUPERNOVA 1998cn IN NGC 3735
     M. Schwartz corrects his offset figures given on IAUC 6944 to
about 10" west and 6" north of the galaxy's nucleus.

SGR 1627-41
     D. A. Smith and A. M. Levine report on behalf of the RXTE/ASM
teams at Massachusetts Institute of Technology and Goddard Space
Flight Center: "Three short (< about 1 s) burst events, most likely
produced by the new soft gamma-ray repeater SGR 1627-41 (IAUC 6944),
were detected in SSC 3 of the RXTE/ASM at May 17.943917, 17.954243,
and 18.010803 UT.  These bursts are not associated with the times
of any reported BATSE triggers.  Due to low signal-to-noise, our
standard blind-search analysis procedure did not yield a position
of the source, so we performed a search, assuming that the source
is located within a 1-degree-long segment of the IPN annulus
(Hurley et al., IAUC 6948) centered on the supernova remnant
G337.0-0.1 noted by Woods et al. on IAUC 6948.  We find a maximum
reduction in chi**2 for sources located at R.A. = 16h35m.8, Decl. =
-47o32' for event 1 and R.A. = 16h35m.8, Decl. = -47o39' for event
2 (1-sigma error of 4' in Decl. in both cases).  Both positions are
consistent with the location of G337.0-0.1.  If we assume that
these two bursts came from G337.0-0.1, their fluences are 2 and 3 x
10E-7 erg/cm**2 (5-12 keV).  No flux was detected in the band 1.5-5
keV with 2-sigma upper limits of 1 x 10E-7 erg/cm**2 for both events."

                      (C) Copyright 1998 CBAT
1998 June 23                   (6950)            Daniel W. E. Green

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