Multiwavelength observations of XTE J1859+226

    ATEL # 49; C.A. Haswell, S. Chaty, A.J. Norton (Open University), 
W. Chen (NASA/GSFC/U.MD.) and R.I. Hynes (Southampton University)
       

Subjects: Radio, Millimeter, Sub-Millimeter, Far-Infra-Red, Infra-Red, Optical,
Ultra-Violet, X-ray, Gamma Ray, >GeV, Request for Observations, Binaries, Black
Holes, Neutron Stars, Transients, Variables Referred to by ATEL #: 50

We have scheduled further simultaneous HST and RXTE observations of the new
X-ray transient XTE J1859+226, planned from October 27th 1999 19:26 to October
28th 00:02 UT. Coordinated multi-wavelength observations (simultaneous,
near-simultaneous, and following the evolution over days/weeks) would be
extremely helpful.  

If you can observe simultaneously with HST and/or XTE, high time-resolution
data (< 10 seconds) will be particularly useful. It will also be very useful to
know what the source did in the gaps between our exposures, appended below both
for HST and XTE.  

Details of the target are given in IAUC # 7274 , IAUC # 7276 , IAUC # 7278 ,
IAUC # 7279 , IAUC # 7282 , IAUC # 7284 , ATEL #47 and ATEL #48. The
coordinates are R.A. = 18h58m41s.51, Decl. = +22o39'30".2 (J2000.0). Garnavich
et al. (IAUC 7276) give a finding chart (link below).  

***** For a best multiwavelength coverage purpose, the HST and detailed XTE
schedule of the science observations is given below: 

### HST ### 

Date: Oct 27 1999; From UT Start 19:38:21 - to UT End 23:43:20 

### XTE ### 

Type: Start: Date: Oct 27 1999; UT Start: 19:26:00 

Type: Science 1: Date: Oct 27 1999; UT Start: 19:34:00 to UT End: 19:47:00 

Type: Science 2: Date: Oct 27 1999; UT Start: 20:15:00 to UT End: 20:35:00 

Type: Science 3: Date: Oct 27 1999; UT Start: 21:10:00 to UT End: 21:29:00 

Type: Science 4: Date: Oct 27 1999; UT Start: 21:54:00 to UT End: 22:10:00 

Type: Science 5: Date: Oct 27 1999; UT Start: 22:46:00 to UT End: 23:12:00 

Type: Science 6: Date: Oct 27 1999; UT Start: 23:30:00 to UT End: 23:46:00 

Type: End: Date: Oct 28 1999; to UT End: 00:02:00 

***** 

Please do not hesitate to contact us if you wish in order to achieve the most
fruitful multiwavelength campaign.