SUMMARY OF PROPOSAL 41045
DR TADAYASU DOTANI
INSTITUTE OF SPACE AND ASTRONAUTICAL SCIENCE
KANAGAWA JAPAN 229
SAGAMIHARA
YOSHINODAI 3-1-1

  E-mail: DOTANI@ASTRO.ISAS.AC.JP	Tel: 0427-51-3911	Fax: 0427-59-4253
  Medium: 2.5GB8MM

Subject: X-RAY BINARIES                                              
  Title: THE RAPID BURSTER IN QUIESCENCE                                                 


Abstract:
 During the ASCA PV phase, the Rapid Burster was detected by us for the first time in
 quiescence; its luminosity was 2x10E33 erg/sec. The energy spectrum was scarcely
 constrained due to the short exposure (20 ksec). With an 80 ksec exposure, as
 proposed here, we will obtain a much better spectrum and perhaps be able to identify
 the X-ray emission mechanism in quiescence. This will constrain the spin period and
 magnetic field strength of the neutron star. We also will search for coherent
 pulsations down to a rms fractional variation of 20 %. In the unlikely event that
 the Rapid Burster is burst active, we will perform simultaneous observation with
 XTE, which provide us the best quality of data for both energy and timing analysis.

 Co-Is:
   1  KAZUHISA MITSUDA    	ISAS                          JAPAN     
      (No Co-I contact data)
   2  KAZUMI ASAI         	ISAS                          JAPAN     
   3  WALTER LEWIN        	MIT                           USA       
   4  JAN VAN PARADIJS    	UAH                           NETH      


Target Name           PRI RA        Dec        Time TC  Off GIS SIS_Cts  Obs
-------------------   --- --------  --------   ---- --  --- --- -------  ---
RAPID BURSTER          2  263.3500  -33.3880    80   N   Y   P  0.00400   1 

REMARKS:           WE REQUEST TO OBSERBE THE SOURCE DURING AUGUST - OCTOBER WINDOW.