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ASCA weekly

Dear ASCA users,

A TOO observation of GRB970828 was installed in the span of Aug. 29 
21:40 (UT) to Aug. 30 20:20 (UT).  The observation of PKS 420-01,
which was in the span was shifted to Aug. 31 and the 60 ksec observation
of UW CrB (PI: K. Mukai, Pri-C) was reduced to 30 ksec exposure.

This ASCA TOO observation of GBD was made under collaboration between
RXTE and ASCA (see note below the schedule) on the follow-up observation 
of the X-ray afterglow and further refinement GBD position that was  
confined by RXTE.  

>From this observation about one day after the burst,  ASCA detected 
X-ray afterglow (see IAUC 6729). Futher details will be reported soon 
in the second IAUC.

F. Nagase

August 29 - September 9,  1997		ver-2   (97/09/03)
(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)
8/29	21:40	GBD970828	CXB	30	MOT	TOO	ASCA/XTE team

8/30	20:20	UW CrB		CV	30	US	3/n	K. Mukai

8/31	13:50	PKS 420-01	AGN	30	ESJ	3/n	J. Reeves

9/ 1	 7:00	AK Her		Star	40	ESJ	2/n	J. Pye

9/ 2	 8:40	Gal. Ridge 10#1 SNR	10	JPN	1/n	S. Yamauchi

9/ 2	14:00	Gal. Ridge 10#2	SNR	10	JPN	1/n	S. Yamauchi

9/ 2	19:40	Gal. Ridge 10#3	SNR	10	JPN	1/n	S. Yamauchi

9/ 3	 3:00	Gal. Ridge 10#4	SNR	10	JPN	1/n	S. Yamauchi

9/ 3	10:00	Gal. Ridge 10#5	SNR	10	JPN	1/n	S. Yamauchi

9/ 3	14:50	Gal. Ridge 10#6	SNR	10	JPN	1/n	S. Yamauchi

9/ 3	20:20	Gal. Ridge 10#7	SNR	10	JPN	1/n	S. Yamauchi

9/ 4	 5:10	Gal. Ridge 10#8	SNR	10	JPN	1/n	S. Yamauchi

9/4	10:40	Gal. Ridge 10#9	SNR	10	JPN	1/n	S. Yamauchi

9/ 4	16:20	Gal. Ridge10#10	SNR	10	JPN	1/n	S. Yamauchi

9/ 4	22:50	1E161348-5055	SNR	60	US	3/n	E. Gotthelf

9/ 6	11:20	ESO 138-G1	AGN	40	JUS	2/n	C. Otani

9/ 7	13:00	PKS 0405-385 #2	AGN	45	JUS	2/n	S. Miyoshi
					(JPN-JPN merged)	/N. Kawai
9/ 8	21:30	G 312.4-0.4	SNR	40	JPN	3/n	M. Ozaki

(9/ 9	22:20	MNV 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 (Calibration and maintenance)

ASCA/RXTE collaboration for X-ray afterglow observations of gamma-ray bursts
We have agreed to perform ASCA TOO observations for the bursts triggered
by BATSE and confined  position with RXTE under the collaboration between
RXTE and ASCA teams. Therefore, no personal proposal is required for such
events. The baseline of the collaboration is as follow:

(1) RXTE and ASCA teams establish a collaboration on the TOO 
observations to measure X-ray afterglows as early as possible and 
to confine the position as accurate as possible so as for the optical 
observers to make follow-up observations of optical afterglows.

(2) The task team consists of F. Marshall, T. Takeshima, R. Corbet,
from RXTE side and T. Murakami, A. Yoshida, N. Kawai and some others
from ASCA team, and the task team is lead in collaboration by F. Marshall 
and T. Murakami.

(3) The task team is responsible to evaluate the feasibility, to make a 
quick observation planning, to care observations and to perform quick 
analysis of the observations and finally to release the results as early 
as possible to the world astronomers, on behalf of the RXTE/BATSE and ASCA 
teams. The results attained will be released to astronomers through Bacodine 
(GCN) network for preliminary results and through IAU Circular.

(4) All data of the ASCA TOO observations on this collaboration are made 
public as early as possible in a manner similar with the ASCA calibration