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IAUC 7221: GRB 990712; C/1998 T1

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                                                  Circular No. 7221
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)


GRB 990712
     J. Heise and J. in 't Zand, Space Research Organization of the
Netherlands, Utrecht; G. Tarei and V. Torroni, BeppoSAX Science
Operation Center, Telespazio, Rome; M. Feroci and G. Gandolfi,
Istituto di Astrofisica Spaziale, CNR, Rome; and E. Palazzi,
Istituto Tecnologie e Studio Radiazioni Extraterrestri, Bologna,
report:  "A gamma-ray burst of moderate intensity, with the
strongest x-ray counterpart observed to date, triggered the
BeppoSAX Gamma-Ray Burst Monitor on July 12.69655 UT and was
simultaneously detected in the Wide Field Camera (WFC) unit 2.  The
burst lasted for about 30 s in both the gamma-ray (40-700 keV) and
x-ray (2-26 keV) energy ranges and has a double-peaked structure.
The WFC-determined position of the x-ray counterpart to GRB 990712
is R.A. = 22h31m50s, Decl. = -73o24'.4 (equinox 2000.0), with an
error radius of 2' (99-percent confidence level).  Due to sun
constraints, BeppoSAX cannot perform a follow-up observation with
the Narrow Field Instruments."


COMET C/1998 T1 (LINEAR)
     Ephemeris from the orbital elements on MPEC 1999-M35:

1999 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
July  1    19 57.53   -44 38.0   0.490   1.470  153.1   18.2    8.1
     11    16 12.50   -43 41.3   0.574   1.485  136.1   28.4    8.5
     21    14 39.72   -32 49.5   0.836   1.512  109.1   39.4    9.4
     31    14 07.33   -26 26.9   1.151   1.552   91.3   40.8   10.2
Aug. 10    13 53.87   -22 56.9   1.474   1.603   77.8   38.2   10.9
     20    13 48.23   -20 55.9   1.787   1.663   66.4   33.9   11.5
     30    13 46.48   -19 44.2   2.081   1.732   56.0   28.9   12.0
Sept. 9    13 46.93   -19 02.3   2.351   1.807   46.2   23.7   12.4
     19    13 48.73   -18 39.5   2.594   1.888   36.8   18.6   12.8

     Total visual magnitude estimates:  July 8.52 UT, 9.2 (M.
Mattiazzo, Wallaroo, South Australia, 0.20-m reflector); 9.39, 8.4
(S. T. Rae, Palmerston North, New Zealand, 0.11-m reflector);
10.31, 9.5 (N. Biver, Oahu, HI, 0.26-m reflector); 11.90, 8.6 (J.
G. de S. Aguiar, Campinas, Brazil, 11x80 binoculars); 13.54, 8.5
(Rae, 10x50 binoculars).

                      (C) Copyright 1999 CBAT
1999 July 13                   (7221)            Daniel W. E. Green

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