Multiwavelength observations of XTE J1859+226
ATel #55; C. A. Haswell, S. Chaty (Open University), W. Cui (NASA/GSFC/U. MD.), J. V. Casares (IAC), and R. I. Hynes (Southampton University)
on 4 Mar 2000; 01:08 UT
Distributed as an Instant Email Notice Request For Observations
Credential Certification: Sylvain Chaty (S.Chaty@open.ac.uk)
Subjects: Radio, Millimeter, Sub-Millimeter, Far-Infra-Red, Infra-Red, Optical, Ultra-Violet, X-ray, Gamma Ray, >GeV, Request for Observations, A Comment, Binary, Black Hole, Neutron Star, Transient
On March 2 06:00 UT the transient source XTE J1859+226
had faded considerably to R=18.0 in the optical (IAC)
and to a flux of about 13 mCrab (RXTE ASM).
However, it clearly remains active in the X-rays.
From extrapolating the last spectrum obtained with HST on 2000, February 8th
we predict the following approximate magnitude and colours:
V~18.4, U-B=-0.5, B-V = V-R = R-I = +0.4.
A final simultaneous HST/RXTE visit to this source (most likely a
black hole) is scheduled
for 2000, March 5th between 06:10 and 13:41 UT.
Time details are given below.
Coordinated multiwavelength observations (simultaneous,
near-simultaneous, and following the evolution over days/weeks/months)
would be extremely helpful. Simultaneous or near simultaneous
red and infrared photometry or spectrophotometry (where we have no
satellite coverage); and/or photometry with time-resolution greater that
about 10s (where the signal to noise ratio justifies this) is particularly
solicited.
The target is now an end-of-night object, observable
for about 2 hours before twilight.
Details of the target are given in IAUC # 7274 , IAUC # 7276 , IAUC # 7278 ,
IAUC # 7279 , IAUC # 7282 , IAUC # 7284 , IAUC # 7291 , ATEL #47 and ATEL #50.
The coordinates are R.A. = 18h58m41s.51, Decl. = +22o39'30".2 (J2000.0).
Garnavich et al. 1999 (IAUC 7276 ) give a finder chart (see link below).
*****
For a best multiwavelength coverage purpose, the HST and detailed
XTE schedule of the science observations is given below:
### HST ###
HST observations
start: Mar 5 2000 06:10:16 UT
end: Mar 5 2000 13:41:12 UT.
### XTE ###
RXTE observations on source intervals:
Mar 5 2000 07:23:00 to 08:21:00 UT
Mar 5 2000 08:59:00 to 09:57:00 UT
Mar 5 2000 10:34:00 to 11:18:00 UT.
field chart
