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Analyzing archival data of the INTEGRAL observatory we discovered andlocalized a cosmic gamma-ray burst detected within fields of view of theIBIS/ISGRI and SPI telescopes on April 28, 2006. The burst has not beenrevealed by the INTEGRAL Burst Alert System (IBAS), so the information on itscoordinates has not been distributed in time and search for the afterglow hasnot been carried out. The burst has been also detected by the KONUS/WIND andRHESSI spacecrafts. Its fluence was 2.3x10^{-6} erg/cm^2 in the 20-200 keVenergy band, the maximum flux was 3.6x10^{-7} erg/cm^2/s (3.9 phot/cm^2/s). Theburst had a complicated multi-peak profile and was outstanding of the typicalbursts by increasing its spectral hardness with time. The emission spectrumnear the flux maximum was characterized by the photon index alpha ~ -1.5 andthe peak energy Ep ~ 95 keV. The burst lasted ~12 s, then we observed itsafterglow at energies 15-45 keV decaying according to a power law with theindex ~ -4.5. The spectral hardness decreased substantially during theafterglow.

Cosmic gamma-ray burst 060428C detected in the fields of view of the IBIS and SPI telescopes of the INTEGRAL observatory and its early afterglow