INTEGRAL Observations of Activity in EXO 2030+375
Abstract
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): <TABLE BORDER CELLSPACING=0 CELLPADDING=5> <TR> <TH>Instrument</TH> <TH>Energy band</TH> <TH>Rate (min-max)</TH> <TH>1 Crab</TH> </TR> <TR> <TD>JEM-X 1</TD> <TD>3-10 keV</TD> <TD>41-47 cts/s</TD> <TD>65 cts/s</TD> </TR> <TR> <TD>JEM-X 1</TD> <TD>10-20 keV</TD> <TD>21-25 cts/s</TD> <TD>21 cts/s</TD> </TR> <TR> <TD>IBIS/ISGRI</TD> <TD>20-40 keV</TD> <TD>95-113 cts/s</TD> <TD>109 cts/s</TD> </TR> <TR> <TD>IBIS/ISGRI</TD> <TD>40-80 keV</TD> <TD>26-31 cts/s</TD> <TD>62 cts/s</TD> </TR> </TABLE> We note that the source reached the 1 Crab flux level around about 20 keV.
- Publication:
-
The Astronomer's Telegram
- Pub Date:
- July 2006
- Bibcode:
- 2006ATel..868....1M
- Keywords:
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- X-ray;
- Binaries;
- Neutron Stars