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IAUC 7519: GRB 001109; SUNGRAZING COMETS

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                                                  Circular No. 7519
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)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


GRB 001109
     L. Amati, F. Frontera, and E. Pian, Istituto Tecnologie e
Studio Radiazioni Extraterrestri, CNR, Bologna; P. Giommi and M.
Capalbi, BeppoSAX Science Data Center, Rome; E. Costa and G.
Gandolfi, Istituto di Astrofisica Spaziale, CNR, Rome; J. J. M. in
't Zand, Space Research Organization Netherlands; C. Guidorzi,
Universita di Ferrara; S. Granata and A. Paolino, BeppoSAX Science
Operation Center, Rome, report:  "The 2'.5 error box of GRB 001109
provided by the BeppoSAX Wide Field Cameras (GCN 879; cf.
http://gcn.gsfc.nasa.gov/gcn/gcn3_archive.html) was observed with
the BeppoSAX Narrow Field Instruments from Nov. 10.0762 (16.5 hr
after the gamma-ray burst) to 10.9847 UT.  A previously unknown
source lying inside the error box has been detected by the Medium
Energy Concentrator Spectrometer.  The source, designated 1SAX
J1830.1+5517, is located at R.A. = 18h30m07s.8, Decl. = +55o17'56"
(equinox 2000.0; error radius 50") and has an average count rate of
0.00914 +/- 0.0007 count/s in the two MECS units, corresponding to
a 2-10-keV flux of (7.1 +/- 0.5) x 10**-13 erg cm**-2 s**-1.  The
flux decreases by a factor of about 2 during the first 20 000 s of
the observation.  Due to its fading behavior, 1SAX J1830.1+5517 is
likely the x-ray afterglow of GRB 001109.  We remark that the
position of this source is consistent with that of the previously
unknown radio source detected in the GRB 001109 error box by Taylor
et al. (GCN 880).  A second BeppoSAX NFI observation of the field
is in progress."


SUNGRAZING COMETS
     Further to IAUC 7514 and 7485, D. Hammer reports his
measurements for several additional Kreutz sungrazing comets found
by M. Oates on SOHO website images obtained with the C2 coronagraph.
The reduced observations and orbital elements by B. G. Marsden are
given on the MPECs cited below.

  Comet         1997 UT           R.A. (2000) Decl.       MPEC
  C/1997 T8     Oct.  8.741      12 48.6   - 6 44       2000-V35
  C/1997 U2     Oct. 17.181      13 19.9   -10 07       2000-V36
  C/1997 U3     Oct. 20.232      13 31.0   -11 09       2000-V36
  C/1997 U4     Oct. 21.953      13 38.9   -11 50       2000-V36
  C/1997 U5     Oct. 26.862      13 58.0   -13 41       2000-V36
  C/1997 U6     Oct. 26.862      13 57.9   -13 42       2000-V36
  C/1997 U7     Oct. 27.673      14 00.8   -13 54       2000-V36

                      (C) Copyright 2000 CBAT
2000 November 15               (7519)            Daniel W. E. Green

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