Dear ASCA users; We have decided to observe Cyg X-1 as TOO of ASCA during the high state currently undergoing. The observation is made on May 30 by using the span once allocated for NGC 4258 pointing No. 2 (JPN Pri-B, PI; Y. Ishisaki). The third pointing of NGC 4258 currently allocated on June 5 is replace to the second pointing and the third pointing of NGC 4258 will be shifted either to the late June or to the next window in fall. This change does not arise any impact to the observation time of other targets allocated in this week as seen below. F. Nagase ----------------------------------------------------------------------------- A S C A WEEKLY OBSERVATION PLAN ----------------------------------------------------------------------------- May 21 - June 2 ver-3 (revised 96/05/24) (ISAS contact scientist: T. TAKAHASHI takahasi@astro.isas.ac.jp) ----------------------------------------------------------------------------- Date MNV Target Tag. Exp. Observation PI or start name Cat. (ks) Cat. Pri./TC ( PPI/Co-PI) ----------------------------------------------------------------------------- 5/21 1:50 0103-72.6 #1 SNR 40 JPN 1/n I. Hayashi 5/22 0:20 PKS 2155-304 #1 AGN 10 USJ 1/Y J.G. Stacy 5/22 6:30 0103-72.6 #2 SNR 40 JPN 1/n I. Hayashi 5/23 6:30 NGC 4258 #1 Gal. 34 JPN 2/n Y. Ishisaki 5/24 3:20 PKS 2155-304 #2 AGN 10 USJ 1/Y J.G. Stacy 5/24 9:30 LMC X-4 Bin. 50 USJ 1/Y S. Vrtilek 5/26 0:10 Mr 2251-178 #1 AGN 20 JPN 2/Y C. Otani 5/26 16:00 PKS 2155-304 #3 AGN 10 USJ 1/Y J.G. Stacy 5/26 22:20 NGC 3607/3608 Gal. 80 JPN 2/n N. Arimoto 5/29 5:50 MS 1147.3+1103 CG 30 MUJ 1/n J. Henry /T. Tsuru 5/30 5:50 Cyg X-1 Bin. 33 JPN TOO F. Nagase /ASCA team 5/31 3:20 HE 1104-1805 AGN 40 US 1/n J. Bechtold 6/ 1 9:00 PKS 2251+113 AGN 30 US 1/n S. Mathur ----------------------------------------------------------------------------- (Note) Obs. Cat. JPN: Japan time, US: US time, JUS: Japan-US Collaboration, USJ: US-Japan Collaboration, MJU: Merged Japan-US (PPI=Japan), MUJ: Merged US-Japan (PPI=US), ESJ: ESA-Japan Program, MOT: Manager's observatory time (Calibration and maintenance)