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IAUC 8087: Sats OF JUPITER; 2003bg; GRB 030227

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                                                  Circular No. 8087
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     S. S. Sheppard, University of Hawaii (UH), reports the
discovery of seven new satellites of Jupiter, with the astrometry,
orbital elements, and ephemerides given on MPEC 2003-E11.  CCD
observations were obtained during Feb. 5-Mar. 4 by Sheppard, D. C.
Jewitt, J. Kleyna, Y. R. Fernandez, and H. H. Hsieh at Mauna Kea
with the 8.3-m Subaru telescope, the 3.6-m Canada-France-Hawaii
Telescope, and the 2.2-m UH telescope.  The very preliminary
orbital elements by B. G. Marsden indicate that two objects have
direct orbits and five have retrograde orbits:  S/2003 J 1, e =
0.79, i = 35 deg, P = 236 days; S/2003 J 2, e = 0.38, i = 152 deg,
P = 983 days; S/2003 J 3, e = 0.24, i = 144 deg, P = 505 days;
S/2003 J 4, e = 0.20, i = 145 deg, P = 722 days; S/2003 J 5, e =
0.21, i = 165 deg, P = 761 days; S/2003 J 6, e = 0.76, i = 22 deg,
P = 234 days; S/2003 J 7, e = 0.41, i = 159 deg, P = 747 days.
Absolute magnitudes range from 15.6 to 16.9.

SUPERNOVA 2003bg IN MCG -05-10-15
     A. M. Soderberg, S. R. Kulkarni, and E. Berger, California
Institute of Technology; and D. A. Frail, National Radio Astronomy
Observatory, report that an observation of SN 2003bg with the Very
Large Array at 8.46 GHz on Mar. 4.07 UT reveals a radio source with
a flux density of 2.50 +/- 0.06 mJy that is coincident with the
supernova (IAUC 8082).  Estimated as being about 2 weeks past the
explosion time (IAUC 8084), SN 2003bg has a radio luminosity that
is 2 percent of that observed for SN 1998bw at 14 days after the
supernova explosion (Kulkarni et al. 1998, Nature 395, 663).

GRB 030227
     R. Gonzalez-Riestra, M. Guainazzi, N. Loiseau, P. M. Rodriguez-
Pascual, M. Santos-Lleo, N. Schartel, B. Juarez, R. Perez-Martinez,
and M. Gilomo, XMM-Newton Science Operations Centre, report that an
XMM-Newton target-of-opportunity observation of GRB 030227 on Feb.
27.7 UT detected a bright source at R.A. = 4h57m33s.3, Decl. =
+20o29'04" (equinox 2000.0; uncertainty about 4") with the EPIC-pn
and MOS cameras during a 49000-s exposure.  The source faded (in
the band 0.2-5 keV) from 0.15 to 0.07 EPIC-pn counts/s during the
observation.  The spectrum is consistent with a hydrogen column
density of 3 x 10**21 cm**-2.  The observed flux in the range 2-10
keV is 5.5 x 10**-13 erg cm**-2 s**-1.

                      (C) Copyright 2003 CBAT
2003 March 4                   (8087)            Daniel W. E. Green

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