  Active galactic nuclei (AGNs) and gamma-ray bursts (GRBs) are powerful
astrophysical events with relativistic jets. In this Letter the broadband
spectral properties are compared between GRBs and the well-observed blazars.
The distribution of GRBs are consistent with the well-known blazar sequence
including the $\nu L_\nu(5\rm GHz)-\alpha_{\rm RX}$ and $\nu L_\nu(5\rm
GHz)-\nu_{\rm peak}$ correlations, where $\alpha_{\rm RX}$ is defined as the
broadband spectral slope in radio-to-X-ray bands, and $\nu_{\rm peak}$ is
defined as the spectral peak frequency. Moreover, GRBs occupy the low radio
luminosity end of these sequences. These two correlations suggest that GRBs
could have a similar radiation process with blazars both in the prompt emission
and afterglow phases, i.e., synchrotron radiation.
