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ASCA Weekly

Dear ASCA users:

I am sending an observation plan for the week November 26 to December 4.

ASCA observations for AO1 GO has been progressing regularly at present.  
I wish to notice you to check your observation plan (especially target 
coordinate,  optical axis position for pointing, selection of observation 
modes) carefully. We have prepared three positions of optical axis nominal 
for 1CCD,  2CCD and 4CCD modes, however, I wish to issue a stern 
warning that the nominal axis position for 4CCD mode is not suitable  for 
observations of point sources. This position is located only 1 arcminute 
from SIS S1 gap (2 arcminute from SIS S0 gap) which is just comparable 
with the ASCA pointing accuracy. This means that there is a significant 
probability that the image core drops into the gap between the chips of SIS. 
We are now preparing a fourth nominal position of optical axis, which 
offsets by (SX, SY) = (-2.5'. +3.0') from the mechanical axis, yielding an 
optimum observation efficiency for SIS sensors but somehow degrading 
quality of GIS data due to the frames on the GIS sensors. You can ask ISAS 
or NASA/GSFC contact scientists for details. The ISAS contact scientist for 
this week is T. Dotani (e-mail address; dotani@astro.isas.ac.jp).

F. Nagase

November 26 - December 4,  1993:  
(ISAS contact scientist:   T. Dotani;  dotani@astro.isas.ac.jp)
Date	MNV	Target 		Tag. 	Exp.	Observation		 	
	start	name		Cat.	(ks)	Cat.	Pri.	PPI / CoPI	

11/26	 2:40	NGC 3628	Gal.   	20	JPN	2	H. Kunieda

11/26	17:30	Mkn 766		AGN	40	USJ	2	K. Leighly 

11/27	18:30	GSP 4		CXB	50	JPN	3	J. Butcher

11/28	23:00	LMC X-4		Bin.	30	JUS 	2	Nagase/Vrtilek

11/29	20:00	LMC X-4		Bin.	20	JUS	2	Nagase/Clark

11/30	12:00	Beta Cet	Star	20	US	2	S. Drake

12/ 1	 3:40	SN1993J		SNR	40	JPN	1	Y. Tanaka

12/ 1	21:50	NGC 4151	AGN	10	USJ	1	R. Edelson

12/ 2	 6:00	NGC 3690	Gal.	40	JPN	1	H. Watarai

12/ 3	 3:50	Abell 85	CG	50	US	2	A. Prestwich	

12/ 4	13:00	(next target)