Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 8452: TRANSIENT IN Lyn; 2004gq, 2004gr

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).


Read IAUC 8451  SEARCH Read IAUC 8453

View IAUC 8452 in .dvi, .ps or .PDF format.
IAUC number


                                                  Circular No. 8452
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)


TRANSIENT IN LYNX
     E. J. Christensen, Lunar and Planetary Laboratory, reports the
discovery of a transient starlike object located at R.A. =
8h03m24s.60 +/- 0s.07, Decl. = +38o18'35".9 +/- 0".5 (equinox
2000.0).  Nothing is visible within 0'.5 of this position on the
Palomar Sky Survey or in the USNO-A2.0 catalogue.  Following are
red magnitudes derived from the CCD images, taken in the course of
the Catalina Sky Survey with the Catalina 0.68-m Schmidt telescope:
Dec. 11.4321 UT, [19.5; 11.4436, 15.9; 11.4549, 17.5; 11.4656, 18.2;
11.5073, 19.6; 11.5081, 18.9; 11.5090, 19.1; 11.5099, 19.7.


SUPERNOVAE 2004gq AND 2004gr
     Discoveries of two supernovae have been reported from
unfiltered CCD images:  SN 2004gq independently by H. Pugh and W.
Li (LOSS/KAIT; cf. IAUC 8448) and by F. Manzini (Novara, Italy,
0.4-m telescope; Stazione Astronomica di Sozzago Supernova Search),
and SN 2004gr by LOSS.

SN       2004 UT        R.A.  (2000.0)  Decl.    Mag.     Offset
2004gq   Dec. 11.36   5 12 04.81  -15 40 54.2   15.5   22".3 E, 22".4 N
2004gr   Dec. 11.57  11 26 15.02  +27 52 06.7   17.9   9".2 W, 5".5 N

The data for SN 2004gq above are from LOSS; position end figures by
R. Behrend (Geneva Observatory) from Manzini's image:  04s.87,
53".6.  Manzini adds that nothing is visible at this location on
Digitized Sky Survey images or on his earlier images (no dates
specified).  Additional magnitudes for SN 2004gq:  Dec. 4.38 UT,
[19.5 (KAIT); 11.93, 15.9 (Manzini); 12.02, 15.9 (Manzini); 12.30,
15.4 (KAIT).  KAIT magnitudes for SN 2004gr:  May 19.19, [19.5;
Nov. 20.58, hint (poor conditions); Dec. 12.58, 17.9.
     A. V. Filippenko and R. J. Foley, University of California,
Berkeley, report that inspection of CCD spectra (range 320-940 nm),
obtained on Dec. 12 UT with the Keck I 10-m telescope (+ LRIS),
shows that SN 2004gq is probably of type Ic, roughly 4 days before
maximum brightness.  Its spectrum generally resembles the pre-
maximum spectrum of SN 1994I (Filippenko et al. 1995, Ap.J. 450,
L11), but there is an additional, weak absorption line at rest
wavelength 635 nm that could be attributed H_alpha.  The equivalent
width of the narrow interstellar Na I D absorption line at 589 nm
is about 0.1 nm.  Spectra of SN 2004gr show that it is of type II,
probably the II-P variety and roughly a month past explosion, given
the well-developed P-Cyg profiles of hydrogen Balmer, Fe II, and
other lines.

                      (C) Copyright 2004 CBAT
2004 December 12               (8452)            Daniel W. E. Green

Read IAUC 8451  SEARCH Read IAUC 8453

View IAUC 8452 in .dvi, .ps or .PDF format.


Our Web policy. Index to the CBAT/MPC/ICQ pages.


Valid HTML 4.01!