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IAUC 6610: GRB 970402; 1997bm

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                                                 Circular No. 6610
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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Phone 617-495-7244/7440/7444 (for emergency use only)


GRB 970402
     M. Feroci, E. Costa, and L. Piro, Istituto Astrofisica
Spaziale, CNR, Frascati; F. Frontera and G. Zavattini, Universita
di Ferrara; L. Nicastro and E. Palazzi, Istituto Tecnologie e
Studio Radiazioni Extraterrestri, CNR, Bologna; G. Celidonio, G.
Gandolfi, and A. Coletta, BeppoSAX, Rome; and J. Heise, and J. in
't Zand, Space Research Organization of the Netherlands, Utrecht,
report:  "The BeppoSAX Gamma Ray Burst Monitor (GRBM) was triggered
on Apr. 2.930 UT.  A quick-look analysis of the GRBM light curve
shows a rather weak, highly structured gamma-ray burst (GRB)
lasting > 100 s.  The intensity at its maximum is about 300
counts/s.  The gamma-ray burst was detected by the Wide Field
Camera (WFC) number 1 with a similar time profile and a maximum
countrate of about 70 counts/s.  Taking into account the off-axis
position, the peak flux corresponds to about 0.46 Crab.  From the
WFC image, we have derived a preliminary position of R.A. =
14h50m24s, Decl. = -69o18'.0 (equinox 2000.0), with a 12' error
radius.  A refined position will result from the off-line analysis.
A BeppoSAX TOO pointing of the Narrow Field Instruments was
performed starting on Apr. 3.270, just 8 hr after the GRB trigger
time.  Observations in all bands are solicited."
     J. Heise and J. in 't Zand, Space Research Organization of the
Netherlands; E. Costa, Istituto di Astrofisica Spaziale, CNR,
Frascati; and F. Frontera, Istituto Tecnologie e Studio Radiazioni
Extraterrestri, CNR, Bologna, report on behalf of the BeppoSAX-WFC
team:  "GRB 970402 was localized in the field of Wide Field Camera
1 using the known positions of five other x-ray sources in the same
field (e.g., Cir X-1, 4U 1254-63, and Cen X-3) as verification.
The position of GRB 970402 is R.A. = 14h50m16s, Decl. = -69o19'.9
(equinox 2000.0), with an error-circle radius of 3'."


SUPERNOVA 1997bm IN IC 705
     D. Balam, University of Victoria, reports that Cousins R-band
images obatined with the 1.82-m Plaskett Telescope of the National
Research Council of Canada on Apr. 3.29 UT (when R = 18.1 +/- 0.2)
yield the following position for SN 1997bm:  R.A. = 11h32m57s.13,
Decl. = +50o14'43".6 (equinox 2000.0), which is 7".8 east and 12".9
north of the galaxy's center.  A nearby star (R = 17.2 +/- 0.2) has
position end figures 51s.79, 13'11".2.  Several long V-band images
(300 and 600 s) suggest that the supernova is rather red.

                      (C) Copyright 1997 CBAT
1997 April 4                   (6610)            Daniel W. E. Green

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