U 0115+63

F. Makino and the Ginga Team, Institute of Space and Astronautical Science, telex: "X-ray activity from the transient pulsar 4U 0115+63 was detected on Feb. 5 with the All-Sky Monitor (ASM) aboard Ginga. The source was also observed with the Large Area Counter (LAC) of Ginga on Feb. 9, 11 and 12. Rough x-ray intensities obtained with the ASM: Feb. 2.88 UT, < 50 mCrab; Feb. 5.85, 100; Feb. 6.85, 100; and Feb. 15.60, 300. Intensities obtained with the LAC: Feb. 9.86, 400 mCrab; Feb. 11.88, 400; and Feb. 12.79, 300. The x-ray flux observed with the LAC exhibited large variations of factors > 3 on timescales of about 10 min. The heliocentric pulse period was 3.6144 +/- 0.0001 s on Feb. 9."