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%astro-ph/0701098

\documentclass[12pt,preprint]{aastex}

\newcommand\src{\protect\objectname[]{GCRT~J1745$-$3009}}
\newcommand{\mjybm}{\mbox{mJy~beam${}^{-1}$}}
\newcommand{\kms}{\mbox{km~s${}^{-1}$}}

\begin{document}
\title{A Faint, Steep Spectrum Burst from the Radio Transient \src}

\author{Scott D.~Hyman}
\affil{Department of Physics and Engineering, Sweet Briar College,
	Sweet Briar, VA  24595}
\email{shyman@sbc.edu}

\author{Subhashis Roy}
\affil{ASTRON, P.O. Box 2, 7990 AA Dwingeloo, The Netherlands.}
\email{roy@astron.nl}

\author{Sabyasachi Pal}
\affil{National Centre for Radio Astrophysics, Tata Institute of  
Fundamental Research, Pune, India}
\email{spal@ncra.tifr.res.in}

\author{T.~Joseph~W.~Lazio}
\affil{Remote Sensing Division, Naval Research Laboratory, Washington, DC
	20375-5351}
\email{Joseph.Lazio@nrl.navy.mil}

\author{Paul S.~Ray}
\affil{E.~O.~Hulburt Center for Space Research, Naval Research  
Laboratory, Washington, DC
	20375-5352}
\email{Paul.Ray@nrl.navy.mil}

\author{Namir E.~Kassim}
\affil{Remote Sensing Division, Naval Research Laboratory, Washington, DC
	20375-5351}
\email{Namir.Kassim@nrl.navy.mil}

\and

\author{S. Bhatnagar}
\affil{National Radio Astronomy Observatory, Array Operations Center,
P.O. Box O,
1003 Lopezville Road,
Socorro, NM 87801-0387}
\email{sbhatnag@nrao.edu}

\begin{abstract}
\src\ is a transient bursting radio source located in the direction of the
Galactic center. It was discovered in a 330~MHz VLA observation from
2002 September 30--October 1 and subsequently rediscovered in a  
330~MHz GMRT observation from 2003 September 28 by Hyman et al. Here  
we report a new radio detection of the source in 330~MHz GMRT data  
taken on 2004 March 20. The observed properties of the single burst  
detected differ significantly from those measured previously,  
suggesting that \src\ was detected in a new physical state.
The 2004 flux density was $\sim$0.05 Jy, $\sim$10$\times$ weaker than  
the single 2003 burst and $\sim$30$\times$ weaker than the five bursts  
detected in 2002.
We derive a very steep spectral index, $\alpha = -13.5 \pm 3.0$,  
across the bandpass, a new result previously not detectable due to  
limitations in the analysis of the 2002 and 2003 observations. Also,  
the burst was detected for only $\sim$2 min., in contrast to the 10  
min. duration observed in the earlier bursts. Due to sparse sampling,  
only the single burst was detected in 2004, as in the 2003 epoch, and  
we cannot rule out additional undetected bursts that may have occurred  
with the same $\sim$77 min. periodicity observed in 2002 or with a  
different periodicity. Considering our total time on source throughout  
both our archival and active monitoring campaigns, we estimate the  
source exhibits detectable bursting activity $\sim$7\% of the time.

\end{abstract}
\end{document}