Circular No. 6571

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                                                  Circular No. 6571




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)
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Phone 617-495-7244/7440/7444 (for emergency use only)


GRB 970111
     K. Hurley, Space Sciences Laboratory, Berkeley, on behalf of
the Ulysses Gamma-Ray Burst Team; C. Kouveliotou, G. Fishman, and C.
Meegan, on behalf of the Gamma Ray Observatory BATSE Team; and J.
van Paradijs, University of Amsterdam and University of Alabama in
Huntsville, report:  "A refined triangulation of GRB 970111 has
been done using almost final Ulysses and BATSE data.  The resulting
position is an annulus whose half-width is 0.027 deg, centered at
R.A. = 11h50m56s, Decl. = +33o21'.8 (equinox 2000.0), with central
radius 49.981 deg.  Combining this with the refined BeppoSAX error
circle by in 't Zand et al. (IAUC 6569) gives an approximately
trapezoidal error box with corners at R.A., Decl. = 15h28m24s,
+19o34'.2; 15h28m28s, +19o36'.04; 15h28m08s, +19o33'.97; 15h28m20s,
+19o39'.25.  This error box is consistent with the one reported on
IAUC 6545 but has an area approximately seven times smaller.  Only
minor improvements to this error box are expected."
     T. Galama, University of Amsterdam (UoA); R. Strom,
Netherlands Foundation for Research in Astronomy, Dwingeloo, and
UoA; J. van Paradijs; L. Hanlon and K. Bennett, European Space
Agency/ESTEC; C. Kouveliotou, Universities Space Research
Association; G. Fishman and C. Meegan, Marshall Space Flight Center,
NASA; J. Heise, SRON, Utrecht; and K. Hurley report:  "We have made
radio observations at 840 MHz (21" x 62" beamwidth) with the
Westerbork array of the revised BeppoSAX/WFC-IPN error box of GRB
970111 (cf. IAUC 6569 and Hurley et al., above) on Jan. 12 (for 1.5
hr), Jan. 13, 14, 16, 20, and 29 (12 hr each day).  We also
observed at 5 GHz for 6 hr on each of Feb. 26 and 27.  The error
box contains one weak unresolved radio source (A) at R.A. =
15h28m17s.7, Decl. = +19o35'39" (equinox 2000.0); two sources lie
just outside the error box: B, R.A. = 15h28m12s.8, +19o32'50"; C,
R.A. = 15h28m04s.9, Decl. = +19o35'00".  The 840-MHz and 5-GHz
fluxes in mJy are as follows:  source A, 0.6, <0.5; B, 1.0, < 0.5;
C, < 0.5, 0.8 (upper limits are 3 sigma)."


COMET 81P/WILD 2
     Total visual magnitude estimates: Feb. 2.15 UT, 10.0 (R. Keen,
Mt. Thorodin, CO, 0.32-m reflector); 7.05, 9.8 (J. Bortle,
Stormville, NY, 0.41-m reflector); 14.06, 9.7 (A. Diepvens, Balen,
Belgium, 0.15-m refractor); 27.94, 9.9 (A. Pereira, Cabo da Roca,
Portugal, 0.25-m reflector); Mar. 1.07, 9.9 (B. H. Granslo,
Fjellhamar, Norway, 0.20-m reflector).

                      (C) Copyright 1997 CBAT
1997 March 1                   (6571)            Daniel W. E. Green