Central Bureau for Astronomical Telegrams
IAUC 6594: GRB 970228; N Cas 1995; C/1995 O1
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Circular No. 6594
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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GRB 970228
K. Hurley, Space Sciences Laboratory, Berkeley, on behalf of
the Ulysses Gamma-Ray Burst Team; E. Costa and M. Feroci, Istituto
Astrofisica Spaziale, CNR, Frascati; F. Frontera, Universita di
Ferrara and Istituto TESRE, CNR, Bologna; D. Dal Fiume and M.
Orlandini, Istituto TESRE, CNR, Bologna, report: "A refined
triangulation of GRB 970228 has been done using Ulysses and SAX
GRBM data. The resulting position is an annulus whose half-width
is estimated to be 31" at 3-sigma confidence, or approximately one-
half that previously reported by Hurley et al. (IAUC 6578). The
R.A. and Decl. of the annulus center and the radius are unchanged,
namely R.A. = 11h03m47s, Decl. = +36o31'.5 (equinox 2000.0), and
83.422 deg. The galaxy reported by Groot et al. (IAUC 6588) lies
20" from the annulus center line, and is therefore consistent with
this new localization."
NOVA CASSIOPEIAE 1995
S. P. S. Eyres, Keele University; R. J. Davis and S. K. Watson,
University of Manchester, Jodrell Bank; and M. F. Bode, Liverpool
John Moores University, report the first radio detection of N Cas
1995 via MERLIN observations at 6 cm on 1996 Dec. 13 and 1997 Jan.
25: "The initial detection found an almost unresolved point with a
peak of 0.48 mJy/beam, and a total flux of 0.6 mJy. By the time of
the second measurement, this had risen to a peak of 0.75 mJy/beam,
with a total flux of 1.2 mJy, and the nebula was marginally
resolved. The peak of emission is within 0".18 of the Carlsberg
Automatic Meridian Circle position (IAUC 6233)."
COMET C/1995 O1 (HALE-BOPP)
Z. Sekanina, Jet Propulsion Laboratory, writes: "Excellent dust
models have been obtained to match the diurnal evolution of the
bright jet monitored by L. Jorda et al. on Feb. 28 (IAUC 6583) and
the system of nearly-concentric halos observed by S. M. Larson and
C. W. Hergenrother on Feb. 8 (URL
http://www.lpl.arizona.edu/bss/HB0208.html). It is confirmed that
the nucleus is not in a state of pure spin. The two features are
unrelated, originating from different sources on the nucleus.
Neither source is found to have been illuminated by the sun during
the entire rotation cycle, both being activated only between local
sunrise and sunset."
(C) Copyright 1997 CBAT
1997 March 19 (6594) Daniel W. E. Green
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