  The CANGAROO-II telescope observed sub-TeV gamma-ray emission from the nearby
starburst galaxy NGC 253. The emission region was extended with a radial size
of 0.3-0.6 degree. On the contrary, H.E.S.S could not confirm this emission and
gave upper limits at the level of the CANGAROO-II flux. In order to resolve
this discrepancy, we analyzed new observational results for NGC 253 by
CANGAROO-III and also assessed the results by CANGAROO-II. Observation was made
with three telescopes of the CANGAROO-III in October 2004. We analyzed
three-fold coincidence data by the robust Fisher Discriminant method to
discriminate gamma ray events from hadron events. The result by the
CANGAROO-III was negative. The upper limit of gamma ray flux was 5.8% Crab at
0.58 TeV for point-source assumption. In addition, the significance of the
excess flux of gamma-rays by the CANGAROO-II was lowered to less than 4 sigma
after assessing treatment of malfunction of photomultiplier tubes.
