  Rapid response and short time latency are very important for Time Domain
Astronomy, such as the observations of Gamma-ray Bursts (GRBs) and
electromagnetic (EM) counterparts of gravitational waves (GWs). Based on the
near real-time Fermi/GBM data, we developed a low-latency pipeline to
automatically calculate the temporal and spectral properties of GRBs. With this
pipeline, some important parameters can be obtained, such as T90 and fluence,
within ~20 minutes after the GRB trigger. For ~90% GRBs, T90 and fluence are
consistent with the GBM catalog results within 2 sigma errors. This pipeline
has been used by the Gamma-ray Bursts Polarimeter (POLAR) and the Insight Hard
X-ray Modulation Telescope (Insight-HXMT) to follow up the bursts of interest.
For GRB 170817A, the first EM counterpart of GW events detected by Fermi/GBM
and INTEGRAL/SPI-ACS, the pipeline gave T90 and spectral information in 21
minutes after the GBM trigger, providing important information for POLAR and
Insight-HXMT observations.
