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Alert Notice 349: Outburst of GW Lib

April 12, 2007

SUBJECT: OUTBURST OF THE CATACLYSMIC VARIABLE 1514-24 GW LIB

Object: 1514-24 GW LIB

Coordinates: R.A. 15h 19m 55.5s Dec. -25o 00' 25" (2000.0)

Rod Stubbings (Drouin, Victoria, Australia) reports an extremely rare outburst of the cataclysmic variable GW Lib now in progress.  The  outburst was detected by him visually at magnitude 13.8 at 11:51 UT on April 12, 2007, and has risen by at least two magnitudes in the past six hours.  The most recent observations place GW Lib on April 12.6590 UT at magnitude 11.8 (visual, Stubbings) and on April 12.6694 UT at 11.86 (CV, Peter Nelson, Ellinbank, Victoria, Australia). A report by M. Uemura and A. Arai of the KANATA team at the Higashi-Hiroshima Observatory, Japan, indicates the object is still rising. 

GW Lib has been classified as either a recurrent nova, or a WZ Sge star, but it is not yet known which of these is correct.  Visual observations and V-band time-series photometry of this rare outburst are urgently requested.

AAVSO e- and f-scale charts are available at the following URL:

http://www.aavso.org/vsp

A Henden-Sumner sequence is available, and may be found at the following URL:

ftp://ftp.aavso.org/public/calib/sumner/gwlib.seq

The sequence file above includes a calibration of the RASNZ sequence. Please state unambiguously which chart and/or sequence you are using when submitting data.

Clear skies and good observing,

Matthew Templeton
AAVSO Headquarters

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