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IAUC 5940: GRB 940217; 1993v; 1993c

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                                                  Circular No. 5940
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


GRB 940217
     K. Hurley, University of California; D. Bertsch, T. Cline,
B. Dingus, J. Esposito, C. E. Fichtel, R. Hartman, S. Hunter,
J. Mattox, C. von Montigny, R. Mukherjee, P. Sreekumar and D.
Thompson, NASA/Goddard Space Flight Center; D. Kniffen, Hampden-Sydney
College; J. Fierro, Y. C. Lin, P. Michelson, P. Nolan and T. Willis,
Stanford  University; E. Schneid, Grumman Aerospace Corporation; G.
Kanbach, H. Mayer-Hasselwander and M. Sommer, Max Planck-Institut fur
Extraterrestrische Physik; G. Fishman, C. Kouveliotou and C. Meegan,
NASA/Marshall Space Flight Center; and M. Boer and M. Niel, Centre
d'Etude Spatiale des Rayonnements, Toulouse, report gamma-ray
observations by the EGRET instrument of the strong burst first
detected by the BATSE experiment on Feb. 17.96021 UT, and on
its annulus defined by timing using the ULYSSES/BATSE network.
Gamma rays above 30 MeV were recorded in the 170-s
interval following the BATSE trigger.  Additional events that
appear to come from the burst direction were also recorded
in the following 180 s.  The preliminary position,
based on only 15 photons, is R.A = 1h56m.8, Decl.
= +3d48' (equinox 2000.0), with uncertainty radii of 0.3 and 0.7 deg
for the 68-percent and 95-percent confidence contours, respectively.
The position is strongly influenced by the highest energy
event at 4.4 GeV.  The annulus defined by timing from ULYSSES
and BATSE has a preliminary center at R.A. = 21h54m.9,
Decl. = +51d57' (equinox 2000.0), with a radius of 69.33 deg and a
total width of 6'.  The width of the annulus is expected
to decrease with additional analysis.  The nearest portion of
the annulus is approximately 0.1 deg from the center of the
EGRET location.  The EGRET location is also consistent with
the position found by COMPTEL (Kippen et al. 1994, IAUC 5937)
and by BATSE.


COMET McNAUGHT-RUSSELL (1993v)
     Recent total visual magnitude estimates indicate that this
comet is significantly brighter than the prediction on IAUC 5926:
Feb. 13.46 UT, 9.5 (D. A. J. Seargent, The Entrance, N.S.W., 0.25-m
reflector); 15.44, 10.4 (A. F. Jones, Nelson, New Zealand, 0.32-m
reflector); 15.44, 9.1 (P. Camilleri, Cobram, Victoria, 20 x 80
binoculars); 16.39, 10.6 (Jones); 16.45, 9.0: (Camilleri).


PERIODIC COMET TEMPEL 1 (1993c)
     Total magnitude estimates: Feb. 6.15 UT, 15.1 (P. Pravec, Ondrejov,
Czech Republic, 0.65-m reflector + CCD); 10.45, 13.4 (A. Hale, near
Orogrande, NM, 0.41-m reflector).


1994 February 24               (5940)              Brian G. Marsden

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