INTEGRAL Observations of Activity in EXO 2030+375
ATel #868; M. L. McCollough (CfA), M. Turler (ISDC, Geneva), D. Willis (MPE, Garching / ISDC, Geneva), S. E. Shaw (Southampton, UK / ISDC, Geneva)
on 27 Jul 2006; 20:29 UT
Credential Certification: M. L. McCollough (mmccollough@head.cfa.harvard.edu)
Subjects: X-ray, Binary, Neutron Star
Referred to by ATel #: 877
The Be/neutron star binary EXO 2030+375 was in the field of view of INTEGRAL
from July 26 at 6:00 UT to July 27 at 11:56 UT during a target of opportunity
observation of Cyg X-3 consisting of 50 pointings of 2 ksec. The major outburst
of the source reported by Corbet & Levine (ATel #843) and by Krimm et al. (ATel
#861) is found to be still on-going with no sign of fading. The table below
summarizes the count rates obtained in single pointings (For JEM-X 1
considering only results for source off-axis angles below 3 degrees):
Instrument |
Energy band |
Rate (min-max) |
1 Crab |
JEM-X 1 |
3-10 keV |
41-47 cts/s |
65 cts/s |
JEM-X 1 |
10-20 keV |
21-25 cts/s |
21 cts/s |
IBIS/ISGRI |
20-40 keV |
95-113 cts/s |
109 cts/s |
IBIS/ISGRI |
40-80 keV |
26-31 cts/s |
62 cts/s |
We note that the source reached the 1 Crab flux level around about 20 keV.
The observations limit the time variability of the source to less than 10% on
the time-scales considered here (2 ksec sampling over one day).