Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 6207: 41P; 1995 Q1; GRO J1735-27

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).

Read IAUC 6206 SEARCH Read IAUC 6208

View IAUC 6207 in .dvi or .ps format.
IAUC number 

                                                  Circular No. 6207
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
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)
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET 41P/TUTTLE-GIACOBINI-KRESAK
     S. Nakano, Sumoto, Japan, has forwarded observations by H. Abe
(Yatsuka, Japan, 0.26-m reflector + CCD), showing that this comet
is in outburst, at m1 = 9.0 on Aug. 18.458 UT.  These observations,
made at the request of the Central Bureau, confirmed that the
sighting on Aug. 17.04 by L. Shotter, Uniontown, PA, of a possible
bright comet close to the predicted location of 41P was indeed that
comet.  Shotter estimated m1 about 8 (0.15-m refractor; coma
diameter about 3'.5 with slight condensation).  This comet also
experienced two large outbursts in 1973 (cf. IAUC 2541, et seq.).


COMET 1995 Q1
     The following position was measured by R. M. West, European
Southern Observatory, from the exposure taken by G. Pizarro (cf.
IAUC 6206):

     1995 UT             R.A. (2000) Decl.
     Aug. 17.99097   11 02 20.9    -13 28 45


GRO J1735-27
     R. B. Wilson, S. N. Zhang, M. Scott, and B. A. Harmon, Marshall
Space Flight Center, NASA; and T. Koh, D. Chakrabarty, B. Vaughan,
and T. A. Prince, California Institute of Technology, report for
the Compton Observatory BATSE team:  "Pulsations from a previously-
uncatalogued source were detected on July 29 in the galactic-center
region by BATSE.  The observed period history shows a clear orbital
signature.  The maximum pulsed intensity was observed on Aug. 13,
with a measured barycentric pulse period of 4.45565 +/- 0.000025 s;
the pulses continue to be observed as of Aug. 16, at energies from
20 to at least 70 keV.  Using occultation imaging, we observed a
source of about 100 mCrab in the energy range 20-50 keV not present
during July 2-14.  A preliminary location (90-percent confidence)
is bounded by a quadrilateral with vertices (equinox 2000.0) at R.A.
= 17h36m, Decl. = -26o.9; 17h37m, -28o.0; 17h33m, -27o.3; 17h32m,
-26o.1.  Positions estimated independently from the pulsed and DC
flux are consistent at a 68-percent confidence level.  If the
detected emissions are from the same source, the pulsed fraction is
about 30 percent.  The energy spectrum of the pulsed component on
Aug. 5 was well fitted by a power-law model F(E) = C[E/(30
keV)]E(-alpha), with C = (2.7 +/- 1.0) x 10E-4 photon cmE-2 sE-1
keVE-1, and alpha = 3.5 +/- 1.0."


1995 August 18                 (6207)            Daniel W. E. Green

Read IAUC 6206 SEARCH Read IAUC 6208

View IAUC 6207 in .dvi or .ps format.

Our Web policy. Index to the CBAT/MPC/ICQ pages.

Valid HTML 4.01!