Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 6654: 1997cm; GRB 970508

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 6653  SEARCH Read IAUC 6655

View IAUC 6654 in .dvi or .ps format.
IAUC number

                                                 Circular No. 6654
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)

     The Mount Stromlo Abell Cluster Supernova Search Team (cf.
IAUC 6639) reports the discovery of an apparent supernova (R = 20.6)
on V and R CCD images taken on May 6 by S. Sabine at the Mount
Stromlo 1.27-m telescope (+ Macho Camera).  SN 1997cm is located
near Abell 3528 at R.A. = 12h53m37s.03, Decl. = -28o48'48".5
(equinox 2000.0).  A nearby star has position end figures 36s.51,
54".8.  SN 1997cm was also present on similar frames taken on May 2
and Apr. 29, but it is not visible on images taken on Feb. 19
(limiting mag R = 22).  Finding charts are available at

GRB 970508
     J. Heise, and J. in 't Zand, Space Research Organization of
the Netherlands, Utrecht; E. Costa, M. Feroci, L. Piro, P. Soffitta,
L. Amati, and M. N. Cinti, 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; A. Tesseri, G. Gandolfi, M. Smith, H.
Muller, D. Ricci, and A. Coletta, BeppoSAX, Rome; and M. Tavani,
Columbia Astrophysics Laboratory and Istituto di Fisica Cosmica e
Tecnologie Relative, CNR, Milan, report:  "On the basis of the
satellite attitude reconstruction of the BeppoSAX observation
during GRB 970508, the position of the x-ray counterpart of the
burst in the Wide Field Camera WFC2 is determined to be R.A. =
6h53m28s, Decl. = +79o17'.4 (equinox 2000.0), with a 3' error
radius (99-percent confidence level) that is offset 2'.9 from the
preliminary position reported on IAUC 6649.  There are no
catalogued sources within the error region.  No other x-ray sources
in the field-of-view of both WFCs were detected for independent
verification of the satellite attitude."
     H. E. Bond, Space Telescope Science Institute, writes: "I have
found a starlike variable source within the error box of GRB 970508,
based on CCD observations with the Kitt Peak 0.9-m reflector.
Between May 9.19 and 10.18 UT, the source brightened by about 1.0
mag in the V band, and on May 10.18 was at V about 20.5, V-I = +0.9.
This starlike source is located at R.A. = 6h53m49s.2, Decl. =
+79o16'19" (equinox 2000.0), within both of the error boxes given
above and on IAUC 6649.  The variable is about 3" east and 13"
south of a slightly brighter star.  Although the brightening
(rather than fading) may make the identification with the GRB
dubious, follow-up observations are desirable."

                      (C) Copyright 1997 CBAT
1997 May 10                    (6654)            Daniel W. E. Green

Read IAUC 6653  SEARCH Read IAUC 6655

View IAUC 6654 in .dvi or .ps format.

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

Valid HTML 4.01!