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INTEGRAL detection of the new MAXI transient MAXI J1659-152

ATEL # 2875; I. Vovk (ISDC-University of Geneva), E. Kuulkers (ESA/ESAC, Spain), J. Alfonso-Garzón (LAEX-CAB/INTA-CSIC, Spain), V. Beckmann (APC, France) , E. Bozzo (ISDC, Switzerland), T. Bird (Southampton, UK), S. Brandt (DTU Space, Denmark) J. Chenevez (DTU Space, Denmark), T. Courvoisier (ISDC, Switzerland), M. Del Santo (INAF/IASF-Roma, Italy), A. Domingo (LAEX-CAB/INTA-CSIC, Spain), K. Ebisawa (ISAS, Japan), P. Jonker (SRON, The Netherlands), P. Kretschmar (ESA/ESAC, Spain), C. Markwardt (GSFC, USA), T. Oosterbroek (ESA/ESTEC, The Netherlands), A. Paizis (INAF-IASF, Italy), K. Pottschmidt (UMBC/NASA GSFC, USA), C. Sánchez-Fernández (ESA/ESAC, Spain), R. Wijnands (UvA, The Netherlands)
on 27 Sep 2010; 10:59 UT
Distributed as an Instant Email Notice (Transients)
Password Certification: Nami Mowlavi (

Subjects: X-ray, Gamma Ray, Binaries, Transients
Referred to by ATEL #: 2880, 2881, 2884, 2888, 2890

During the observations of the Galactic bulge program (see ATel #438), performed from 2010 September 25 at 20:51:11 to 2010 September 26 at 00:32:57, INTEGRAL detected hard X-ray emission from a position consistent with that of the newly discovered transient MAXI J1659-152 (GCN #11299, GCN #11296, and ATel #2873), also detected in the radio band (ATel #2874) at 4.8 GHz.

The source is detected at 17 sigma in the IBIS/ISGRI mosaic image (20-40 keV energy band), and the best determined source coordinates are RA=254.746 DEC=-15.250 (J2000). The estimated error is 1.6 arcmin (90 % c.l.). The source is also detected in the 40-80 keV energy band at a significance of 11 sigma.

The ISGRI spectrum (total exposure time is 5.2 ks) is best fit with a simple power-law model with photon index 2.2 +/- 0.3 at 90% c.l. The estimated flux in the 20-100 keV energy band is 4.1E-9 erg/cm^2/s (~250 mCrab).

The source was outside the JEM-X FOV during the whole duration of the observations.

Further observations of the region around the transient source are currently planned for 2010 September 29 at 03:22:44 as part of the Galactic bulge monitoring program.

Galactic Bulge monitoring program web-page

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R. E. Rutledge , Editor
ATEL Mirror v1.0 Updates