  The light curve, energy spectra, energetics, and IPN localization of an
exceedingly intense short duration hard spectrum burst, GRB 070201, obtained
from Konus-Wind, INTEGRAL (SPI-ACS), and MESSENGER data are presented. The
total fluence of the burst and the peak flux are $S = 2.00_{-0.26}^{+0.10}
\times 10^{-5}$ erg cm$^{-2}$ and $F_{max} = 1.61_{-0.50}^{+0.29} \times
10^{-3}$ erg cm$^{-2}$ s$^{-1}$. The IPN error box has an area of 446 square
arcminutes and covers the peripheral part of the M31 galaxy. Assuming that the
source of the burst is indeed in M31 at a distance of 0.78 Mpc, the measured
values of the fluence $S$ and maximum flux $F_{max}$ correspond to a total
energy of $Q = 1.5 \times 10^{45}$ erg, and a maximum luminosity $L = 1.2
\times 10^{47}$ erg s$^{-1}$. These data are in good agreement with the
corresponding characteristics of the previously observed giant flares from
other soft gamma repeaters. The evidence for the identification of this event
as a giant flare from a soft gamma repeater in the M31 galaxy is presented.
