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IAUC 7281: C/1999 T2; GRB 991014; C/1999 H3

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                                                  Circular No. 7281
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/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


COMET C/1999 T2 (LINEAR)
     Additional astrometry (including prediscovery observations
from Sept. 25 and Oct. 5) appear on MPEC 1999-T64, from whence the
following parabolic orbital elements are taken:

     T = 2000 Nov. 24.6865 TT         Peri. = 104.9646
                                      Node  =  14.8207  2000.0
     q = 3.022536 AU                  Incl. = 110.9028

1999 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Oct.  9    23 05.65   +29 41.7   4.062   4.912  144.8    6.7   16.0
     19    22 52.55   +29 00.7   4.060   4.844  137.8    7.9   15.9
     29    22 40.93   +28 10.5   4.088   4.776  129.0    9.3   15.8
Nov.  8    22 31.15   +27 16.2   4.143   4.709  119.4   10.6   15.8
     18    22 23.39   +26 23.0   4.216   4.642  109.6   11.6   15.8
     28    22 17.66   +25 35.5   4.302   4.576   99.9   12.3   15.8
Dec.  8    22 13.83   +24 56.7   4.394   4.510   90.4   12.6   15.8
     18    22 11.72   +24 29.0   4.486   4.444   81.2   12.6   15.7


GRB 991014
     G. Tassone, BeppoSAX Science Operations Center, Telespazio,
Rome; J. in 't Zand, Space Research Organization Netherlands,
Utrecht; F. Frontera, Istituto Tecnologie e Studio Radiazioni
Extraterrestri, Bologna; and G. Gandolfi, Istituto di Astrofisica
Spaziale, CNR, Rome, report:  "A relatively short gamma-ray burst
triggered the BeppoSAX Gamma-Ray Burst Monitor (GRBM) on Oct.
14.91148 UT and was detected in the Wide Field Camera unit 2.  The
burst lasted for about 3 s at 40-700 keV and 10 s at 2-26 keV.  The
peak flux is 2.5 Crab at 2-26 keV, and the peak photon countrate as
measured with the GRBM at 40-700 keV is 600 counts/s.  The WFC-
determined position is R.A. = 6h51m07s, Decl. = +11o35'.6 (equinox
2000.0), with an error radius of 6' (99-percent confidence level).
A follow-up observation with the Narrow Field Instruments is being
carried out."


COMET C/1999 H3 (LINEAR)
     Visual m_1 estimates:  Sept. 12.17 UT, 14.3 (C. S. Morris,
Lockwood Valley, CA, 0.51-m reflector); Oct. 12.75, 13.5 (M.
Lehky, Hradec Kralove, Czech Republic, 0.20-m reflector).

                      (C) Copyright 1999 CBAT
1999 October 15                (7281)            Daniel W. E. Green

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