ASCA Weekly

[Fumiaki NAGASE <nagase@astro.isas.ac.jp>]

Dear ASCA Users:

ASCA observation schedules between September 22 and October 10,
which are released in previous two weeks are changed as below.
We install TOO observations for two superluminal sources (each 20 ksec), 
GRS 1915+105 and GRO J1655-40 (Nova Sco) on September 27, hence
Calibration observation of Crab nebula at this span is reduced from 100 ksec
to 60 ksec. To supplement the rest 40 ksec,  the observation of BL Hyi 
(PI: R. Fujimoto) on October 4-5 is replaced by the Crab nebula observation.
The observation of BL Hyi is shifted to the next week.

Recently the second outburst of GRS 1915+105 on September 14 was 
reported by Sazonov and Sunyaev (see also Mirabel and Rodriguez; Nature
371, 46, 1994), and it is visible by ASCA now.  At present GRO J1655-40
is reported to be dim below the detection limit of both GRO and GRANAT,
however, however observation of this source at this epoch is the last chance
for ASCA. The source-sun angle is already 74 deg. {90-16} on Sept. 27 
(this means we may not be able to get good quality SIS data already at this 
epoch) and it become soon invisible in several days. We estimate the source 
is yet well detectable by ASCA detection limit. 

F. Nagase

-----------------------------------------------------------------------------
A S C A     WEEKLY  OBSERVATION   PLAN
-----------------------------------------------------------------------------
September 22 - October 4,  1994:  
(ISAS contact scientist:   M. Markevitch,   maxim@astro.isas.ac.jp)
-----------------------------------------------------------------------------
Date	MNV	Target 		Tag. 	Exp.	Observation	PI or 	 
	start	name		Cat.	(ks)	Cat.  Pri./TC	 ( PPI/Co-PI)
-----------------------------------------------------------------------------
9/22	 4:10	Sgr B (part-1)	SNR	60	JPN	2/n	Y. Maeda

9/23	12:10	EC 1931-5915	CV	20	US	2/n	E. Schlegel

9/24	 2:20	Sgr B (part-2)	SNR	20	JPN	2/n	Y. Maeda	

9/24	14:40	MS0440+-2-4	CG	40	MJU	2/n	Y.Tawara/I.Gioia

9/25	20:00	MS0451.5+0250	CG	20	USJ	2/n	E. Ellingson

9/26	12:00	Zeta Ori	Star	20	MJU	2/n	K.Torii/M.Corcoran
,
9/27	00:40	GRS 1915+105	Bin.	20	JPN	TOO	F. Nagase

9/27	13:00	GRO J1655-40	Bin.	20	JPN	TOO	F. Nagase

9/27	00:40	Crab Nebula	SNR	60	MOT	CAL	ASCA team

9/29	18:10	Akn 120		AGN	40	JUS	1/n	H. Kunieda

9/30	22:50	PSR 0540-69	Star	10	JPN	2/n	F. Nagase
-----------------------------------------------------------------------------


-----------------------------------------------------------------------------
A S C A     WEEKLY  OBSERVATION   PLAN
-----------------------------------------------------------------------------
October 1 - 10,  1994:  
(ISAS contact scientist:   T. Dotani,   dotani@astro.isas.ac.jp)
-----------------------------------------------------------------------------
Date	MNV	Target 		Tag. 	Exp.	Observation	PI or 	
	start	name		Cat.	(ks)	Cat.  Pri./TC	 ( PPI/Co-PI)
-----------------------------------------------------------------------------
10/ 1	 8:20	SGR0526-66/N49	SNR	40	JPN	2/n	T. Murakami

10/ 2	10:00	YY Men		Star	20	USJ	2/n	E. Guinan

10/ 2	23:00	PSR 0540-69(P2)	Star	10	JPN	2/n	F. Nagase

10/ 3	 6:40	TX Col		CV	40	ESJ	2/n	P. Wheatley

10/ 4	 9:50	Crab Nebula	SNR	40	MOT	CAL	ASCA team

10/ 5	14:30	NGC 1569	AGN	100	USJ	2/n	R. Griffiths

10/ 7	21:10	S5 0014+813	AGN	20	MJU	1/n	Matsuoka/Elvis
		(AO1 suppl.)

10/ 8	 8:10	W50 West Lobe	SNR	40	JPN	2/n	N. Kawai

10/ 9	14:30	W44 PT2 	SNR	20	MJU	1/n	Murakami/Hughes
		(AO1 suppl.)

(10/10  8:00	to next target)
-----------------------------------------------------------------------------

(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