Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 6628: 1997bt; GRB 970402

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 6627 SEARCH Read IAUC 6629

View IAUC 6628 in .dvi or .ps format.
IAUC number 

                                                 Circular No. 6628
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 1997bt IN ANONYMOUS GALAXY
     D. Hardin reports her discovery, as part of the EROS team's
systematic CCD search with the European Southern Observatory's
Marly 1-m telescope, of a supernova (V about 19.5) on Mar. 31,
located 0".3 east and 0".3 south of the center of a galaxy at R.A.
= 11h06m15s.1, Decl. = -11o36'25" (equinox 2000.0).  No object was
present at the position of the supernova on a CCD frame taken on
Feb. 13.  The host galaxy, number 2915 in the LCRS Survey, has R_c
= 16.17 and redshift 0.06.  A spectrum obtained by S. Benetti on
Apr. 15 at the Danish 1.54-m reflector (+ DFOSC) at La Silla shows
features consistent with those of a type-II supernova a few weeks
after maximum.


GRB 970402
     H. Pedersen, Copenhagen University Observatory; A. Castro-
Tirado and J. Gorosabel, Laboratorio de Astrofisica Espacial y
Fisica Fundamental, INTA, Madrid; L. Metcalfe, European Space
Agency, VILSPA, Madrid; L. Nicastro and E. Palazzi, ITESRE, CNR,
Bologna; F. Frontera, Universita di Ferrara; L. Piro, M. Feroci,
and E. Costa, Istituto di Astrofisica Spaziale, Rome; J. Heise,
Space Research Organization of the Netherlands, Utrecht; M. V.
Alonso, Observatorio de Cordoba; M. Boer, Centre d'Etude Spatiale
des Rayonnements, Toulouse; and G. Mathys, M. Scodeggio, J. Brewer,
S. Benetti, and F. Comeron, European Southern Observatory (ESO),
write:  "We have obtained deep images using the ESO New Technology
Telescope with the EMMI (9' x 9' field, on Apr. 4, 5, and 6) and
SUSI (2'.2 x 2'.2 field, on Apr. 7 and 11) instruments.  The EMMI
data are centered on the 3'-error GRB position (IAUC 6610), while
the SUSI data are centered the 50"-error x-ray position (IAUC 6617).
No variable object was found within the area covered by SUSI; we
estimate that the limits are V = 22.5 and I = 21.7 for the
detection of an emerging or disappearing object.  In the area
covered by EMMI only (thus well removed from the x-ray source), we
found one variable, starlike object, at R.A. = 14h49m43s.6, Decl. =
-69o18'55" (equinox 2000.0); its magnitudes were Apr. 4.2, I =
17.25, V = 18.33, B = 19.32, R = 17.86; Apr. 5.3, I = 17.20, B =
19.30; Apr. 6.4, I = 17.76.  We note that BL Cir (R.A. =
14h49m56s.7, Decl. = -69o20'50", equinox 2000.0) is close to the x-
ray position.  On Apr. 4, we found V = 19.6, B = 21.6 for this
semi-regular variable; a low-dispersion spectrum obtained on Apr. 5
using the 1.54-m Danish telescope (+ DFOSC) indicates that it is a
deeply reddened star of spectral type late-G to early-K."

                      (C) Copyright 1997 CBAT
1997 April 16                  (6628)            Daniel W. E. Green

Read IAUC 6627 SEARCH Read IAUC 6629

View IAUC 6628 in .dvi or .ps format.

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

Valid HTML 4.01!