  GCRT J1745-3009 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 GCRT J1745-3009 was detected in a
new physical state. The 2004 flux density was ~0.05 Jy, ~10x weaker than the
single 2003 burst and ~30x weaker than the five bursts detected in 2002. We
derive a very steep spectral index, alpha = -13.5 +/- 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 ~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 ~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 ~7% of the time.
