IGR17597-2201 and AX1820.5-1434
ATel #155; A. Lutovinov (IKI, Moscow), R. Walter (ISDC), G. Belanger (CEA, Saclay), N. Lund (DSRI), S. Grebenev (IKI, Moscow), C. Winkler (ESA/ESTEC)
on 30 Apr 2003; 09:19 UT
Distributed as an Instant Email Notice Request For Observations
Credential Certification: A.Lutovinov (aal@hea.iki.rssi.ru)
Subjects: X-ray, Gamma Ray, Request for Observations, Transient, Pulsar
Referred to by ATel #: 156
We report the discovery of a new transient source IGR J17597-2201
with the IBIS/ISGRI detector onboard the INTEGRAL observatory.
Its position is RA=17h59.7m and Dec=-22o01m (equinox 2000)
with uncertainty ~2'. The source was detected during
several deep observations of the Galactic center field.
The measured flux in a 15-40 keV energy band was ~5 mCrab
(signal to noise ratio S/N ~ 10) during observation on
March 30-April 1 and increased to 10-15 mCrab (S/N > 21)
during observations on April 15-April 24. At the same time
the source was also detected in 40-100 keV energy band at the
flux of ~10 mCrab (S/N > 14).
We also report a first detection of hard X-ray emission
from a known high mass binary pulsar AX1820.5-1434
on April 19-24 at ~10-15 mCrab in the 15-40 energy band.
Previous observations of the same field have not shown
the presence of the source in this energy band with
an upper limit ~5 mCrab.
We encourage follow up observations at various wavelengths.
