[vsnet-alert 9849] Re: PQT 080119:091534+081356

[Taichi Kato]

This ATEL report confirms the earlier suggestion in
[vsnet-alert 9838] PQT 080119:091534+081356

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The Astronomer's Telegram                   http://www.astronomerstelegram.org 
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Posted: Thu Jan 24 01:30:00 EST 2008 -- Fri Jan 25 01:30:01 EST 2008
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ATEL #1367							     ATEL #1367

Title:		PQT 080119:091534+081356 is a probable dwarf nova near maximum
Author:	E. Glikman, A. Mahabal, A. Drake, S.G. Djorgovski, G. Herczeg
		(Caltech), H.E. Bond (STScI), C. Donalek, M. Graham, R. Williams (Caltech),
		C. Baltay, D. Rabinowithz, A. Bauer, N. Ellman, and the PQ survey
		team
Queries:	george at astro.caltech.edu
Posted:	24 Jan 2008;  21:52  UT
Subjects:	Optical, Cataclysmic Variables, Novae, Transients

Spectra of the transient PQT080119:091534+081356 (Donalek et al., ATEL
#1362) obtained at the Palomar 200-inch Hale telescope on 20 Jan 2008 UT
show strong Balmer lines (beta through zeta, and possibly higher) in absorption,
superposed on a fairly blue continuum; the H alpha line may be just filled
by associated emission; and there is a possible weak absorption line of
He I 4471.  All are at a zero redshift, within the measuring uncertainties.
No other significant features are seen in either emission or absorption.

We interpret this spectrum as being due to a dwarf nova near the
maximum.  This outburst has a large amplitude (a factor of a 100), given
the faint counterpart seen in the SDSS (~ 22.8 mag).   

At the discovery date of 19 Jan 2008 UT, the magnitudes calibrated
to the SDSS system were:   g = 17.64 +- 0.03,   r = 17.69 +- 0.06,   i
= 17.98 +- 0.09, and   z = 17.82 +- 0.10 mag.   The following night, 20
Jan 2008 UT, they were:   g = 17.81 +- 0.03,   r = 17.73 +- 0.10,   i =
18.09 +- 0.09, and   z = 18.32 +- 0.12 mag.   Thus, the object was fading
very slightly over a 24-hour period.   Approximate photometry obtained
at the Palomar 60-inch telescope on 20 Jan 2008 UT is in a general agreement
with these magnitudes and colors: B = 17.3, V = 17.7, R = 17.75, and I
= 18.0 mag, with estimated uncertainties of 0.1 mag.   

Spectra and other information on this object are available at   <a
href=http://palquest.org/transients/> http://palquest.org/transients/ </a>

Real-time discoveries of transients from the PQ survey are reported
at   <a href=http://voeventnet.caltech.edu/feeds/PQ_OT.shtml> http://voeventnet.caltech.edu/
</a>   

PQ Survey Selected Transients: http://palquest.org/transients/
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Password Certification:  S. George Djorgovski (george at astro.caltech.edu)
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