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We report the detection of a new transient radio source, GCRT J1742-3001,located ~1 degree from the Galactic center. The source was detected ten timesfrom late 2006 to 2007 May in our 235 MHz transient monitoring program with theGiant Metrewave Radio Telescope (GMRT). The radio emission brightened in aboutone month, reaching a peak observed flux density of ~100 mJy on 2007 January28, and decaying to ~50 mJy by 2007 May when our last monitoring observationwas made. Two additional faint, isolated 235 MHz detections were made inmid-2006, also with the GMRT. GCRT J1742-3001 is unresolved at each epoch, withtypical resolutions of ~20 arcsec x 10 arcsec. No polarization information isavailable from the observations. Based on nondetections in observationsobtained simultaneously at 610 MHz, we deduce that the spectrum of GCRTJ1742-3001 is very steep, with a spectral index less than about -2. Follow-upradio observations in 2007 September at 330 MHz and 1.4 GHz, and in 2008February at 235 MHz yielded no detections. No X-ray counterpart is detected ina serendipitous observation obtained with the X-ray telescope aboard the Swiftsatellite during the peak of the radio emission in early 2007. We consider thepossibilities that GCRT J1742-3001 is either a new member of an existing classof radio transients, or is representative of a new class having no associatedX-ray emission.

GCRT J1742-3001: A New Radio Transient Towards the Galactic Center