Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 6610: GRB 970402; 1997bm

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).

Read IAUC 6609  SEARCH Read IAUC 6611

View IAUC 6610 in .dvi or .ps format.
IAUC number

                                                 Circular No. 6610
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
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

Read IAUC 6609  SEARCH Read IAUC 6611

View IAUC 6610 in .dvi or .ps format.

Our Web policy. Index to the CBAT/MPC/ICQ pages.

Valid HTML 4.01!