  We search for electron anti-neutrinos ($\overline{\nu}_e$) from long and
short-duration gamma-ray bursts~(GRBs) using data taken by the KamLAND detector
from August 2002 to June 2013. No statistically significant excess over the
background level is found. We place the tightest upper limits on
$\overline{\nu}_e$ fluence from GRBs below 7 MeV and place first constraints on
the relation between $\overline{\nu}_e$ luminosity and effective temperature.
