( catalog 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 ( catalog GCRT~J1745 $ - $ 3009 ) 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 can not 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 .