Chronology of the North Korean capture and detention of the U. S. intelligence ship Pueblo and her crew:

Jan. 23--Four North Korean patrol boats capture the Pueblo in the Sea of Japan off North Korea's eastern coast. U. S. officials describe incident as "a matter of the utmost gravity" and insist ship was 25 miles off coast.

Jan. 24--Secretary of State Rusk describes seizure as "in the category of . . . an act of war" and warns the North Koreans to cool it." North Korean radio broadcasts an alleged confession by Pueblo Capt. Bucher thet he deliberately violated North Korean waters.

Jan. 25--President Johnson orders 14,787 Air Force and Navy. reservists to active duty and announces American military forces in and around South Korea will be strengthened.

Jan. 26-UN Security Council meets on Pueblo crisis but finds no solution.

Feb. 6--The United States withdraws the carrier Enterprise from the position it had taken near the North Korean port of Wonson.

Feb. 12--North Korean radio reports Bucher makes second "confession" of violating North Korean waters.

March 4--President Johnson receives an open letter purported to be from Pueblo crewmen asking United States to frankly admit the vessel had violated North Korean territory.

March 22--April 2-North Korea circulates series of letters allegedly written by captive men and warns United States failure to apologize could cost lives of crew.

June19--State Department discloses talks on crew release make no progress.

Sept. 13--Japanese newspapers report news conference at Pyongyang at which crewmen allegedly said they had been ordered to intrude in the three-mile limit.

Dec. 19--Congressional sources in Washington say agreement reached for crew release.

Dec. 22-State Department announces crew to be released Sunday night.