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IAUC 5996: Mkn 421; 1994i

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                                                  Circular No. 5996
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


MARKARIAN 421
     A. D. Kerrick reports for the Whipple Observatory Gamma Ray
Collaboration (Iowa State University, University of Michigan, Purdue
University, Smithsonian Astrophysical Observatory, University of
Leeds, and the National University of Ireland):  "Observations of
Mkn 421 with the Whipple Observatory 10-m gamma-ray reflector on
May 15 showed a significant increase in the TeV gamma-ray emission.
Over the period 1994 Jan.-Apr., the TeV gamma-ray flux was detected
at a level that was a factor of approximately 2 below that
previously observed (Punch et al. 1992, Nature 358, 477).  As late
as May 10, the flux was consistent with this low level; on May 14,
it was observed to increase, reaching a level on May 15 of ten
times that of the Jan.-Apr. flux.  The observed detection rate was
3.9 counts/minute.  At the energy threshold of 250 GeV, this
corresponds to a flux of 1.87 +/- 0.34 x 10E-10 photon cmE-2 sE-1,
which is comparable to the flux from the Crab Nebula at this energy.
No observations were possible after May 15 because of the moon.
The x-ray flux was reported at a high level on May 16 (IAUC 5993)."


COMET TAKAMIZAWA (1994i)
     Improved parabolic orbital elements from MPEC 1994-K04:

     T = 1994 June 29.5773 TT         Peri. = 192.1029
                                      Node  =  51.1232  2000.0
     q = 1.948146 AU                  Incl. = 135.9779

1994 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
May  23    15 21.29   - 8 41.6   1.007   2.002  165.2    7.4   10.0
     28    14 45.86   - 9 50.1   1.024   1.989  154.9   12.5   10.0
June  2    14 12.82   -10 46.3   1.070   1.978  143.2   17.9   10.1
      7    13 43.64   -11 30.2   1.138   1.968  132.1   22.5   10.2
     12    13 18.89   -12 04.4   1.225   1.960  121.8   26.1   10.4
     17    12 58.45   -12 32.0   1.325   1.954  112.5   28.7   10.5
     22    12 41.83   -12 56.0   1.435   1.950  104.1   30.4   10.7
     27    12 28.43   -13 18.3   1.551   1.948   96.5   31.2   10.8
July  2    12 17.68   -13 40.3   1.670   1.948   89.6   31.5   11.0
      7    12 09.07   -14 02.8   1.790   1.950   83.1   31.2   11.2
     12    12 02.20   -14 26.3   1.910   1.954   77.2   30.5   11.3
     17    11 56.75   -14 51.2   2.027   1.960   71.6   29.5   11.5


1994 May 25                    (5996)            Daniel W. E. Green

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