Central Bureau for Astronomical Telegrams
IAUC 4365: 1987k; 1987A; NSV 6708
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Circular No. 4365
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-495-7244/7440/7444
PERIODIC COMET D'ARREST (1987k)
K. J. Meech and D. C. Jewitt report their recovery of this
comet with the 2.1-m reflector (+ CCD) at Kitt Peak as shown below.
The object did not appear extended through a 9" diaphragm and a
broadband Mould R filter. The correction to the elements on MPC
11501 is Delta-T about -0.06 day.
1987 UT R.A. (1950) Decl. m2
Mar. 31.39006 10 29 10.08 +18 38 46.8 23
31.39735 10 29 09.87 +18 38 48.4
Apr. 2.39508 10 28 09.12 +18 44 54.9
2.40237 10 28 08.88 +18 44 56.3
2.40986 10 28 08.68 +18 44 58.1
SUPERNOVA 1987A IN THE LARGE MAGELLANIC CLOUD
E. L. Chupp, University of New Hampshire (UNH), on behalf of
the Solar Maximum Mission Gamma-Ray Spectrometer (GRS) experiment
team at the UNH, the Max Planck Institute, and the Naval Research
Laboratory, writes: "No significant flux of gamma-rays (with energies
> 100 keV to about 100 MeV) above background fluctuations have been
observed from SN 1987A since core collapse on Feb. 23.316, through
Apr. 9. W. T. Vestrand, A. Ghosh, and E. Chupp have established an
upper limit flux of about 0.3 photons/cm**2/s for a burst in the energy
band 4.1-6.4 MeV during a 10-s interval encompassing the neutrino
burst (IAUC 4338, 4340). No evidence was seen for a gamma-ray burst
which could be associated with shock breakout up to 1500 s after
core collapse. S. Matz, M. Leising, and G. Share (NRL) have summed
spectral data, obtained during the first 24 days following the event,
to obtain a 3-sigma upper limit of about 2 x 10E-3 gamma/cm**2/s for the
intensity of the 812-keV line from Ni-56, with a similar long-
term upper limit for the 847-keV line from Co-56 decay. Quick-look
data in all gamma-ray channels on the GRS are monitored daily at UNH to
detect any significant increase in flux above background. This
monitoring activity will continue indefinitely."
NSV 6708
Visual magnitude estimates (cf. IAUC 4253) by V. F. de Assis
Neto, Sao Francisco de Oliveira, Brazil: 1986 Oct. 2.92, 7.5; Dec.
18.29, 7.6; 1987 Jan. 30.18, 7.5; Feb. 20.13, 7.1; 28.09, 7.0.
1987 April 13 (4365) Daniel W. E. Green
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