Correction to ATEL #233 (2S 1711-339) and addendum to ATEL #205 (A1744-36)
ATel #238; M. A.P. Torres (CfA), J. E. McClintock (CfA), M. R. Garcia (CfA), S. S. Murray (CfA)
on 18 Feb 2004; 18:50 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Manuel Torres (mtorres@cfa.harvard.edu)
Subjects: Optical, X-ray, Binary, Transient
2S 1711-339: In ATEL #233 the absorbed X-ray flux of 2S 1711-339 was
incorrectly given as 2e-15 ergs cm-2 s-1 (0.3-7.0 keV). The correct
value obtained by using a blackbody model with kT = 0.24 +/- 0.03 keV
or a neutron-star hydrogen-atmosphere model with kT = 0.07 +/- 0.03
keV is 1.0e-14 ergs cm-2 s-1 (0.5-10.0 keV). This flux is a factor of
10 below the limit on the quiescent absorbed flux obtained by Wilson
et al. 2003, ApJ,596,1220. We thank R. Wijnands and J. Miller for
alerting us to our error.
A1744-36: In ATEL #205 we reported the X-ray position for a bright
source (165 counts) which was outside the 40 arcsec error circle of
the Ariel V position for A1744-36 (Bradt & McClintock 1983,
ARA&A,21,13). From a further analysis of the Chandra ACIS-S
observation we have discovered two very faint X-ray sources at R.A.=
17:48:14.47, DEC.= -36:08:13.6 (J2000; 7 counts) and R.A. =
17:48:13.13, DEC. = -36:07:58.17 (J2000; 13 counts) which are well
within the Ariel V error circle. Adopting a positional uncertainty of
1 arcsec for these faint sources, the position of the latter X-ray
source is consistent with the precise position of the radio source
reported in ATEL #210.
