Barriere, N.

Beckmann, V.

Bodaghee, A.

Cadolle Bel, M.

Chenevez, J.

den Hartog, P. R.

Grinberg, V.

Kennea, J.

Krivonos, R.

Kuulkers, E.

Paizis, A.

Pottschmidt, K.

Rodriguez, J.

Romano, P.

Soldi, S.

Tomsick, J. A.

Wilms, J.

During monitoring observations of the Norma and Inner Perseus Arms (rev. 1209: 2012 Sept. 6 from 18:18:23 to 22:00:21 UTC), INTEGRAL-ISGRI revealed that the accreting black hole candidates 4U 1630-47 and IGR J17091-3624 have brightened in the hard X-rays. Mosaic images consisting of 12.6 ks worth of observations of this field show that the two objects are detected in both the soft (18-40 keV) and hard (40-100 keV) ISGRI bands.For 4U 1630-47, count rates in the ISGRI soft and hard bands are 7.1+/-0.4 cts/s (34+/-2 mCrab, 20-sigmas) and 3.1+/-0.3 cts/s (30+/-3 mCrab, 12-sigmas), respectively. The former is statistically compatible with the source flux measured by Swift-BAT on that date in a similar energy range (28+/-4 mCrab: http://heasarc.nasa.gov/docs/swift/results/transients ). In JEM-X, 4U 1630-47 has count rates of 94.0+/-2.2 cts/s (534+/-13 mCrab, 43-sigmas) in the 3-10 keV band, and 6.4+/-0.9 cts/s (90+/-13 mCrab, 7-sigmas) in the 10-25 keV band. The spectrum from 4U 1630-47 extends to ~200 keV and can be fit with a power law (Gamma = 2.4+/-0.3; red. Chi^2/dof = 1.4/10; observed flux = 7e-10 erg/cm2/s in 20-100 keV) with no improvement to the fit when a cutoff is added. As recently as four days ago (rev. 1207: 2012 Sept. 2 from 05:18:43 to 09:00:29 UTC), 4U 1630-47 was not detected above the 6-sigma level in either ISGRI band, and could only be detected in the soft JEM-X band (3-10 keV). We note that during the previous brightening in hard X-rays, the source was not detected in the ISGRI hard band (ATel #3945), nor were there reports that the source was detected above 50 keV by Swift-BAT (ATel #4077).Count rates for IGR J17091-3624 in the ISGRI soft and hard bands are 3.4+/-0.5 cts/s (16+/-2 mCrab, 7-sigmas) and 3.3+/-0.3 cts/s (32+/-3 mCrab, 11-sigmas), respectively. The soft-band flux is lower than the 24+/-5 mCrab measured by Swift-BAT on that date in the 15-50 keV band, while the hard-band flux is higher than the value in the same energy range during the previous outburst (20+/-3 mCrab: ATel #3916). This source was outside the field of view of JEM-X. The source spectrum can be fit with a power law (Gamma = 1.7+/-0.4; red. Chi^2/dof = 1.5/10; observed flux = 6e-10 erg/cm2/s in 20-100 keV) up to ~200 keV with no evidence for a cutoff. It was also detected above the 6-sigma level in both ISGRI bands during the previous observation of the field (rev. 1207). A possible transition to the hard state was recently suggested (ATel #4282) using Swift-XRT data. The detection of hard X-ray emission from IGR J17091-3624 confirms that the transition to the hard state is taking (or has taken) place.INTEGRAL will continue to monitor these sources in the coming weeks. Light curves and images of these sources (and others in the field) can be found at the ISA project home page (http://sprg.ssl.berkeley.edu/~bodaghee/isa). We thank the ISDC shift team for their support

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Downloaded from orbit.dtu.dk on: Dec 20, 2017Hard X-ray detection of the black hole candidates 4U 1630-47 and IGR J17091-3624 upto 200 keV with INTEGRALBodaghee, A.; Kuulkers, E.; Tomsick, J. A.; Rodriguez, J.; Barriere, N.; Beckmann, V.; Cadolle Bel, M.;Chenevez, Jérôme; den Hartog, P. R.; Grinberg, V.; Kennea, J.; Krivonos, R.; Paizis, A.; Pottschmidt, K.;Romano, P.; Soldi, S.; Wilms, J.Published in:The Astronomer´s Telegram : ATelPublication date:2012Document VersionPublisher's PDF, also known as Version of recordLink back to DTU OrbitCitation (APA):Bodaghee, A., Kuulkers, E., Tomsick, J. A., Rodriguez, J., Barriere, N., Beckmann, V., ... Wilms, J. (2012). HardX-ray detection of the black hole candidates 4U 1630-47 and IGR J17091-3624 up to 200 keV with INTEGRAL.The Astronomer´s Telegram : ATel, ATel #4360.OutsideGCNIAUCsOtherMacOS: Dashboard Widget Follow ATel on TwitterATELstreamATel Community SitePost a New Telegram | Search | InformationTelegram IndexObtain Credential To Post | RSS Feeds | Email SettingsPresent Time: 20 Dec 2012; 14:22 UTThis space for free for yourconference.[ Previous | Next | ADS  ]Hard X-ray detection of the black hole candidates 4U1630-47 and IGR J17091-3624 up to 200 keV withINTEGRALATel #4360; A. Bodaghee (UC Berkeley), E. Kuulkers (ESAC/ESA), J. A. Tomsick (UCBerkeley), J. Rodriguez (CEA Saclay), N. Barriere (UC Berkeley), V. Beckmann (U. Paris),M. Cadolle Bel (ESAC/ESA), J. Chenevez (DTU), P. R. den Hartog (Stanford), V. Grinberg(U. Erlangen, Bamberg), J. Kennea (PSU), R. Krivonos (MPA, IKI), A. Paizis (INAF Milano),K. Pottschmidt (UMBC, NASA-GSFC), P. Romano (INAF-IASF Palermo), S. Soldi (CEASaclay), J. Wilms (U. Erlangen, Bamberg)on 8 Sep 2012; 06:21 UTDistributed as an Instant Email Notice TransientsCredential Certification: Arash Bodaghee (bodaghee@ssl.berkeley.edu)Subjects: X-ray, Gamma Ray, Binary, Black Hole, TransientDuring monitoring observations of the Norma and Inner Perseus Arms (rev. 1209: 2012 Sept. 6 from18:18:23 to 22:00:21 UTC), INTEGRAL-ISGRI revealed that the accreting black hole candidates 4U1630-47 and IGR J17091-3624 have brightened in the hard X-rays. Mosaic images consisting of 12.6ks worth of observations of this field show that the two objects are detected in both the soft (18-40keV) and hard (40-100 keV) ISGRI bands.For 4U 1630-47, count rates in the ISGRI soft and hard bands are 7.1+/-0.4 cts/s (34+/-2 mCrab, 20-sigmas) and 3.1+/-0.3 cts/s (30+/-3 mCrab, 12-sigmas), respectively. The former is statisticallycompatible with the source flux measured by Swift-BAT on that date in a similar energy range(28+/-4 mCrab: http://heasarc.nasa.gov/docs/swift/results/transients ). In JEM-X, 4U 1630-47 hascount rates of 94.0+/-2.2 cts/s (534+/-13 mCrab, 43-sigmas) in the 3-10 keV band, and 6.4+/-0.9cts/s (90+/-13 mCrab, 7-sigmas) in the 10-25 keV band. The spectrum from 4U 1630-47 extends to~200 keV and can be fit with a power law (Gamma = 2.4+/-0.3; red. Chi^ 2/dof = 1.4/10; observedflux = 7e-10 erg/cm2/s in 20-100 keV) with no improvement to the fit when a cutoff is added. Asrecently as four days ago (rev. 1207: 2012 Sept. 2 from 05:18:43 to 09:00:29 UTC), 4U 1630-47 wasnot detected above the 6-sigma level in either ISGRI band, and could only be detected in the softJEM-X band (3-10 keV). We note that during the previous brightening in hard X-rays, the sourcewas not detected in the ISGRI hard band (ATel #3945), nor were there reports that the source wasdetected above 50 keV by Swift-BAT (ATel #4077).Count rates for IGR J17091-3624 in the ISGRI soft and hard bands are 3.4+/-0.5 cts/s (16+/-2mCrab, 7-sigmas) and 3.3+/-0.3 cts/s (32+/-3 mCrab, 11-sigmas), respectively. The soft-band flux islower than the 24+/-5 mCrab measured by Swift-BAT on that date in the 15-50 keV band, while thehard-band flux is higher than the value in the same energy range during the previous outburst (20+/-3mCrab: ATel #3916). This source was outside the field of view of JEM-X. The source spectrum canbe fit with a power law (Gamma = 1.7+/-0.4; red. Chi^ 2/dof = 1.5/10; observed flux = 6e-10erg/cm2/s in 20-100 keV) up to ~200 keV with no evidence for a cutoff. It was also detected abovethe 6-sigma level in both ISGRI bands during the previous observation of the field (rev. 1207). Apossible transition to the hard state was recently suggested (ATel #4282) using Swift-XRT data. Thedetection of hard X-ray emission from IGR J17091-3624 confirms that the transition to the hard stateis taking (or has taken) place.INTEGRAL will continue to monitor these sources in the coming weeks. Light curves and images ofthese sources (and others in the field) can be found at the ISA project home page(http://sprg.ssl.berkeley.edu/~bodaghee/isa). We thank the ISDC shift team for their support.Related4406 Comment to ATEL #4395:MAXI/GSC X-ray light curveof 4U 1630-472 updated withthe latest calibration showsno drop in soft X-ray (2-4 keV)band on 2012 September 184395 A rapid decline of the blackhole transient 4U 1630-472 insoft X-rays: approaching thehard state ?4360 Hard X-ray detection of theblack hole candidates 4U1630-47 and IGR J17091-3624 up to 200 keV withINTEGRAL4282 Recent activity of the blackhole X-ray binary IGR J17091-3624 as observed with theSWIFT/XRT : spectralhardening following the sharpdrop in X-ray intensity4077 Swift detects an increase inthe hard X-ray emission fromthe BHC 4U 1630-474075 MAXI/GSC detection of arapid X-ray spectral changein the black hole candidate4U 1630-4723945 INTEGRAL detects the hard X-ray brightening of 4U 1630-473916 A possible state change inthe black-hole candidate IGRJ17091-36243913 The black hole candidate IGRJ17091-3624 is still active3842 MAXI/GSC detects a quasi-regular outburst and apossible soft state transitionin H 1743-3223830 MAXI/GSC detection of anoutburst from a black holecandidate 4U 1630-4723667 Black hole X-ray binary IGRJ17091-3624 shows a uniqueintensity variation pattern3418 IGR J17091-3624 shows aunique quasi-'rho' classvariability during recentRXTE/PCA observations3299 RXTE observationsstrengthen the similaritiesbetween the black holecandidates IGR J17091-3624and GRS 1915+105.3266 Multiple evolving peaks inthe power density spectrumand the spectral transitionwere detected in IGR J17091-36243232 Radio detection in 2003 ofIGR J17091-36243230 IGR J17091-3624 undergoes'heartbeat' oscillationssimilar to those of GRS1915+1053229 INTEGRAL observationssuggest IGR J17098-3628 isnot the source of 10 mHzQPOs3225 Discovery of 10 mHz quasi-periodic oscillations likelyfrom IGR J17091-36243203 The soft spectral state of theblack hole candidate IGRJ17091-3624 observed byINTEGRAL and Swift3179 RXTE observes fast QPOevolution in IGR J17091-3624indicating possible statetransition3168 0.1 Hz QPOs during RXTEobservations of IGR J17091-36243167 Radio emission from IGRJ17091-3624 observed withthe ATCA3159 INTEGRAL observations ofthe BHC IGR J17091-3624 inoutburstconverted by Web2PDFConvert.com3150 The optical and near-infraredcounterpart to IGR J17091-36243148 Swift/XRT ObservationsConfirm that IGR J17091-3624is in Outburst3144 Swift/BAT reports renewedactivity from IGR J17091-36241140 Swift/XRT Observations ofIGR J17091-3624 and IGRJ17098-3628444 New X-ray transient IGRJ1709.8-3628 discoveredwith INTEGRAL160 BeppoSAX measurements ofIGR J17091-3624 = 1SAXJ1709-36152 Possible radio counterpart toIGR J17091-3624150 IGR J17091-3624 in archivaldata of MIR/KVANT/TTM149 IGR J17091-3624Tweet 1   [ Telegram Index ]R. E. Rutledge, Editor-in-ChiefDerek Fox, EditorRecommend 1converted by Web2PDFConvert.com

Hard X-ray detection of the black hole candidates 4U 1630-47 and IGR J17091-3624 up to 200 keV with INTEGRAL

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Hard X-ray detection of the black hole candidates 4U 1630-47 and IGR J17091-3624 up to 200 keV with INTEGRAL

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