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IAUC 8939: P/2008 G2; 2008bo

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IAUC number

                                                  Circular No. 8939
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://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

     Comet P/1994 J3 = 1994k = 1994 XXVIII (Shoemaker, a.k.a.
'Shoemaker 4'; cf. IAUC 5991, 5998, etc.) was identified by T. B.
Spahr in single-night observations of minor planets (first
observation tabulated below) that were reported by the Catalina Sky
Survey to the Minor Planet Center, with additional observations
found by B. G. Marsden (see CBET 1347 for additional details).  The
indicated correction to the prediction on MPC 56803 (ephemeris on
MPC 60734) is Delta(T) = -1.7 days.  The available astrometry,
orbital elements, and ephemeris appear on MPEC 2008-H20.

     2008 UT             R.A. (2000) Decl.       Mag.
     Apr. 10.30664   15 06 27.21   +11 53 06.5   18.6

SUPERNOVA 2008bo IN NGC 6643
     C. J. Stockdale, Marquette University and University of
Oklahoma; K. W. Weiler, Naval Research Laboratory; S. Immler,
Goddard Space Flight Center; J. M. Marcaide, University of
Valencia; N. Panagia, Space Telescope Science Institute and
Observatory of Catania; S. D. Van Dyk, Spitzer Science Center,
California Institute of Technology; R. A. Sramek, National Radio
Astronomy Observatory; and D. Pooley, University of Wisconsin at
Madison, report the detection of radio emission from the type-II
supernova 2008bo (cf. CBETs 1324, 1325) with the Very Large Array
(VLA) radio telescope.  The measured position of the radio emission
of R.A. = 18h19m54s.41, Decl. = +74o34'21".0, (equinox 2000.0) is
in good agreement with the measured optical position (end figures
54s.34, 20".9, from CBET 1324) and with the previously reported
radio position (end figures 54s.30, 21".1, from
http://www.astronomerstelegram.org/?read=1477).  A flux density of
0.507 +/- 0.043 mJy was measured at 8.46 GHz (wavelength 3.5 cm) on
Apr. 18.52 UT.  This observation supports the first radio detection
(op.cit.), which had a flux density of 0.234 +/- 0.070 mJy measured
at 22.46 GHz (wavelength 1.3 cm) and 0.477 +/- 0.053 mJy at 8.46
GHz (wavelength 3.5 cm) on Apr. 5.75.  No radio emission was
detected near the vicinity of SN 2008bo with a 3-sigma upper limit
of 0.23 mJy at 8.46 GHz on Apr. 7.10.  The recent radio
measurements presented here were prompted by the x-ray brightening
(ATEL 1481, 1463) detected in the Swift observations of SN 2008bo.
This observed radio re-brightening is very uncommon.  Further radio
observations have been requested.  VLA scheduling officers
generously supported the authors' observing program.

                      (C) Copyright 2008 CBAT
2008 April 23                  (8939)            Daniel W. E. Green

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