Central Bureau for Astronomical Telegrams

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IAUC 6616: 1997bq; GRB 970402

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                                                 Circular No. 6616
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/cfa/ps/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


SUPERNOVA 1997bq IN NGC 3147
     Stephen Laurie, Church Stretton, Shropshire, U.K., reports his
discovery of a supernova (mag about 16.1) on CCD images taken with
a 0.25-m reflector during Apr. 7.91-8.00 UT.  SN 1997bq is located
at R.A. = 10h17m04s.0, Decl. = +73o23'03" (equinox 2000.0), which
is 1' southeast of the galaxy's nucleus, embedded in the fainter
outer arms of the galaxy.  A nearby star (mag 18) has position end
figures 07s.1, 10".  No star is visible at the position of the
supernova on images taken on Feb. 27 and Mar. 24.91 (limiting mag
17.0-17.5), nor is anything present on the Digital Sky Survey.
     P. Challis, Harvard-Smithsonian Center for Astrophysics,
reports that a spectrum obtained at the Multiple Mirror Telescope
shows this to be a type-Ia supernova, 1 or 2 days before maximum.


GRB 970402
     P. J. Groot and T. J. Galama, University of Amsterdam (UoA);
J. van Paradijs, UoA and University of Alabama in Huntsville; C.
Kouveliotou, Universities Space Research Association, at Marshall
Space Flight Center, NASA; R. Strom, Netherlands Foundation for
Research in Astromony; M. Brown and R. Webster, University of
Melbourne; L. Van Zyl and B. Warner, University of Cape Town; J.
Menzies, South African Astronomical Observatory; J. in 't Zand and
J. Heise, Space Research Organization of the Netherlands, Utrecht;
E. Costa, M. Feroci, and L. Piro, Istituto di Astrofisica Spaziale,
CNR; F. Frontera and G. Zavattini, Universita di Ferrara; and L.
Nicastro and E. Palazzi, Istituto Tecnologia e Studie Radiazione
Extraterrestri, CNR, report:  "We obtained R-band images of the 3'-
radius error box of GRB 970402 (IAUC 6610) on Apr. 3.7 UT (2400 s,
limiting mag R = 21.5), and on Apr. 4.8 (3000 s, limiting mag 21.0,
due to high winds) using the 1.0-m telescope at Siding Spring.  We
also obtained an R-band mosaic of five pointings covering 35
percent of the error box, with integration times of 45 min per
pointing (limiting mag R = 21.5), with the South African
Astronomical Observatory's 1-m telescope on Apr. 4.0.  A comparison
among these frames shows no obvious increase or decrease in
brightness in any object by more than 0.3 mag (2 sigma), to a limit
of R = 21.0.  Comparison with the Digital Sky Survey shows no
brightening of sources to R = 19."

                      (C) Copyright 1997 CBAT
1997 April 8                   (6616)            Daniel W. E. Green

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