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IAUC 8459: 2004gw, 2004gx; 2005A; SGR 1806-20

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IAUC number 

                                                  Circular No. 8459
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)


SUPERNOVAE 2004gw AND 2004gx
     Further to IAUC 8435, T. Puckett and R. Ireland report the
discovery of an apparent supernova (mag 17.9) on an unfiltered CCD
frame taken with the 0.60-m automated supernova patrol telescope on
2004 Dec. 27.14 UT (and confirmed on frames taken on Dec. 29.11 at
mag 17.7).   SN 2004gw is located at R.A. = 5h08m48s.41, Decl.
= +62o26'20".7 (equinox 2000.0), which is 17".7 east and 14".2
south of the center of PGC 16812.  The object is not present on
images taken by Puckett on Sept. 10 and Nov. 9 (limiting mag about
20.0).
     D. Rich, Hampden, ME, reports his discovery of an apparent
supernova (mag about 17.6) on unfiltered CCD frames taken with a
0.31-m reflector on 2004 Dec. 30.96 and 2005 Jan. 1.93 UT.  SN
2004gx is located at R.A. = 23h33m30s.80, Decl. = +24o01'07".0
(equinox 2000.0), which is about 7".0 west and 5".4 south of the
center of UGC 12663.  Nothing is visible at this location on
Palomar Sky Survey plates (limiting red mag 20.1, limiting blue mag
19.7) or on CCD frame taken by Rich on 2004 Oct. 21.01 and Nov.
20.07 (limiting mag about 18.6).


SUPERNOVA 2005A IN NGC 958
     Further to IAUC 8453, J. Graham and W. Li report the LOSS
discovery of an apparent supernova (mag about 17.1) on unfiltered
KAIT images taken on Jan. 5.26 and 6.25 UT.  SN 2005A is located at
R.A. = 2h30m43s.25, Decl. = -2o56'19".8 (equinox 2000.0), which is
8".2 east and 0".7 north of the nucleus of NGC 958.  A KAIT image
taken on 2004 Dec. 17.25 showed nothing at this position (limiting
mag about 19.0).


SGR 1806-20
     P. Chandra, Tata Institute of Fundamental Research, Mumbai,
reports the low-frequency radio detection of the soft gamma-ray
repeater SGR 1806-20 (cf. IAUC 5875) with the Giant Metrewave Radio
Telescope on Jan. 4.409 UT.  The flux density at 608 MHz was 198.9
+/- 11.9 mJy, while at 240 MHz it was 242.6 +/- 14.9 mJy.  The
power-law index between the two frequencies is -0.21 +/- 0.09,
which is substantially flatter than that reported for the higher-
frequency VLA observation on Jan. 4.59 by Cameron and Kulkarni (GCN
2934; alpha = -0.74 at 1.4 GHz) or -0.61 +/- 0.06 reported by
Gaensler et al. at the same time and frequency (GCN 2933).

                      (C) Copyright 2005 CBAT
2005 January 6                 (8459)            Daniel W. E. Green

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