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IAUC 6481: GRB 960720; C/1996 E1

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                                                  Circular No. 6481
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)


GRB 960720
     T. Murakami, R. Shibata, H. Inoue, and F. Nagase, Institute of
Space and Astronautical Science; A. Yoshida, N. Kawai, C. Otani,
and F. Tokanai, Institute of Physical and Chemical Research; and J.
Heise, Space Research Organization of the Netherlands, Utrecht,
report on behalf of the ASCA team:  "We observed the error region
of the SAX-BATSE gamma-ray burst (IAUC 6467) with ASCA on Sept. 19
with a net exposure of 26~000 s.  Only one weak x-ray source was
detected within the SAX-WFC error region, whose location is
consistent with the reported x-ray source of the ROSAT all-sky
survey (IAUC 6469), to an accuracy of within 1' radius.  The
observed GIS countrate (0.7-10 keV) was very weak, (2.8 +/- 0.6) x
10E-3 count/s.  Assuming a power-law model with index -2, and a
galactic absorption toward this direction of 2.5 x 10E20 cmE-2,
the observed flux was 1 x 10E-13 erg cmE-2 sE-1 in the band 0.5-2
keV and 2 x 10E-13 erg cmE-2 sE-1 in the band 0.5-10 keV.  The
flux at 0.5-2 keV is roughly consistent with the flux observed
with ROSAT before the burst that occurred during 1990 Aug. 22-28
(IAUC 6469)."
     Corrigenda to IAUC 6480.  Line 22, for  (2.5 +/- 0.5)  read
(0.9 +/- 0.2).  Line 27, for  about 1 x 10E-13  read  about 4 x
10E-14.  Line 28, for  1 and 3 x 10E-13  read  5 and 10 x 10E-14.


COMET C/1996 E1 (NEAT)
     Continuation to ephemeris on IAUC 6440, from orbital elements
by B. G. Marsden on MPC 27882:

1996 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Oct.  4    19 19.25   +48 19.5   1.196   1.683   99.7   35.9   11.2
      9    19 30.85   +40 59.8   1.242   1.725  100.1   34.7   11.3
     14    19 40.63   +34 14.0   1.307   1.768   99.4   33.8   11.6
     19    19 49.25   +28 10.1   1.390   1.813   97.6   33.0   11.8
     24    19 57.07   +22 50.3   1.486   1.859   95.0   32.2   12.1
     29    20 04.33   +18 13.1   1.594   1.906   91.9   31.4   12.3
Nov.  3    20 11.19   +14 14.4   1.711   1.953   88.4   30.5   12.6
      8    20 17.74   +10 49.7   1.835   2.002   84.6   29.5   12.8
     13    20 24.08   + 7 54.4   1.963   2.051   80.7   28.4   13.1
     18    20 30.25   + 5 24.2   2.094   2.100   76.7   27.3   13.3
     23    20 36.27   + 3 15.3   2.227   2.150   72.7   26.0   13.6

                      (C) Copyright 1996 CBAT
1996 October 2                 (6481)            Daniel W. E. Green

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