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IAUC 6545: GRB 970111; EG Cnc

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                                                 Circular No. 6545
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)


GRB 970111
     D. A. Frail, National Radio Astronomy Observatory; S. R.
Kulkarni, California Institute of Technology; L. Nicastro, D. Dal
Fiume, M. Orlandini, E. Palazzi, and G. Pizzichini, ITESRE, Bologna;
F. Frontera and G. Zavattini, Universita di Ferrara; L. Amati,
M. N. Cinti, E. Costa, M. Feroci, and L. Piro, IAS, Frascati; and
R. Jager and J. Heise, SRON, report:  "We have detected a single
unresolved (at a level of 1") radio source coincident with one of
the two x-ray sources (source 'a') seen toward GRB 970111 by
BeppoSAX (IAUC 6539).  Observations at 20 cm with the Very Large
Array on Jan. 13.58 UT yield the position R.A. = 15h28m44s.57 +/-
0s.01, Decl. = +19 44'35".0 +/- 0".2 (equinox J2000.0) and a flux
density of 2.0 mJy.  There is no radio source in the error circle
of BeppoSAX source 'b' above a 3-sigma level of 0.18 mJy.  A radio
monitoring program is underway of the entire 10'-radius error
circle; a preliminary analysis of 20-cm data taken on Jan. 12.58,
13.58, and 15.57 shows no significant variability for any of the
radio sources detected in this larger field at a level of 1 mJy or
more."
     K. Hurley, Space Sciences Laboratory, University of California,
Berkeley, on behalf of the Ulysses Gamma-Ray Burst Team; and C.
Kouveliotou, G. Fishman, and C. Meegan, Marshall Space Flight
Center, NASA, on behalf of the Compton Gamma Ray Observatory BATSE
Team, report:  "A preliminary triangulation of this event has been
done using Ulysses and BATSE data.  The resulting position is an
annulus whose half-width is 0.045 deg centered at R.A. = 11h50m56s,
Decl. = +33 21'.8 (equinox 2000.0), with central radius 49.979 deg.
Combining this with the BeppoSAX error circle (IAUC 6533) gives an
approximately trapezoidal error box with corners at R.A., Decl. =
15h28m20s, +19 30'.2; 15h28m57s, +19 46'.8; 15h27m59s, +19 32'.2;
15h28m38s, +19 49'.7 (equinox 2000.0).  Only one of the BeppoSAX
sources given on IAUC 6539, source 'a', lies within this error box.
Further analysis is expected to reduce the width of this error box
substantially."


EG CANCRI
     Visual magnitude estimates by P. Schmeer, Bischmisheim,
Germany (cf. IAUC 6517):  1996 Dec. 12.91 UT, 12.6; 15.10, 13.7;
15.21, 13.8; 1997 Jan. 16.14, [13.7; 16.83, 13.0:; 17.14, 13.3.

                      (C) Copyright 1997 CBAT
1997 January 24                (6545)            Daniel W. E. Green

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