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IAUC 6586: C/1995 O1; GS 1843+00

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                                                 Circular No. 6586
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)


COMET C/1995 O1 (HALE-BOPP)
     A. J. Apponi, T. C. Pesch, and L. M. Ziurys, Steward
Observatory, University of Arizona; and P. Wehinger and S. Wyckoff,
Arizona State University, report on radio observations of comet
C/1995 O1 obtained with the NRAO 12-m telescope at Kitt Peak on
Mar. 10:  "We detected the HNC J=3-2 transition at 271.981 GHz with
an integrated line-intensity of 3.89 K km sE-1 relative to the main
beam brightness temperature.  On Mar. 9, we independently detected
HCO+ via the J=2-1 and the J=3-2 transitions at 178.375 and 267.557
GHz, with integrated intensities of 3.11 and 4.12 K km sE-1,
respectively.  Also on Mar. 9, we detected the HCN J=2-1 transition
at 177.261 GHz with an integrated intensity of 13.4 K km sE-1.
Observations of the HCN J=3-2 transition at 265.866 GHz suggest an
abundance ratio for [HNC]/[HCN] about 0.5."


GS 1843+00
     R. B. Wilson and B. A. Harmon, Marshall Space Flight Center,
NASA; D. M. Scott, M. H. Finger, and C. R. Robinson, Universities
Space Research Association; D. Chakrabarty, Massachusetts Institute
of Technology; and T. A. Prince, California Institute of Technology,
report for the Compton Observatory BATSE Team: "Pulsations from the
transient x-ray binary pulsar GS 1843+00 have been detected since
Mar. 3 in the energy range 20-50 keV.  Using observations through
Mar. 9, the mean barycentric pulse frequency at epoch Mar. 6.0 UT
was (3.382592 +/- 0.000035) x 10E-2 Hz.  The observed spinup rate
during this observation is (4.18 +/- 0.12) x 10E-11 Hz sE-1. The
mean RMS pulsed flux integrated over 20-50 keV was (3.75 +/- 0.24)
x 10E-10 erg cmE-2 sE-1 on Mar. 8-9.  Earth-occultation
measurements indicate a steady increase in total intensity from
early March to Mar. 8-9, with a total flux of 5.1 +/- 0.5 x 10E-9
erg cmE-2 sE-1, giving a pulse fraction of about 7 percent.  The
thermal bremsstrahlung model (without Gaunt factor) yields a
temperature of 23 keV.  Pulsed and steady emission are also
observed on Mar. 10.  Updates to source intensity and pulse
frequency are posted twice-weekly for this and all other bright
sources detected by BATSE at the web site
http://www.batse.msfc.nasa.gov.  Observations are encouraged at all
wavelengths, as no optical counterpart is currently known for this
source."

                      (C) Copyright 1997 CBAT
1997 March 14                  (6586)            Daniel W. E. Green

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