A dataset provided by the European Space Agency

Name: Public TOO on GS1826-24
Published: 2025-03-25T09:54:38Z

Proposal ID	1270010
Obs ID	12700100001
Title	Public TOO on GS1826-24
Download Data Associated to the proposal	https://isla.esac.esa.int/tap/download/bundle?format=ascii_curl&product_id=prop_id:1270010
DOI	https://doi.org/10.57780/esa-d71vqtw
Author	Chenevez
Abstract	The neutron star low-mass X-ray binary GS 1826-238, aka the Clocked Burster, is currently observed in a new state change as revealed by Swift/BAT and MAXI light-curves. This is only the 4th time since the source discovery in 1989, but also already the 4th time in 15 months only, indicating that these state changes seem to occur more and more frequently.As its name indicates, this source is known to produce bursts at a regular recurrence time typically around 4-5 hours. We observed the source for the first time in a soft state in June 2014 (see Chenevez et al. astro-ph/1509.01248) with Swift/XRT and NuSTAR showing a much different burst behavior than usual, with both much shorter bursts and recurrence times. At that time the hardness ratio of Swift/BAT to MAXI intensities was below 0.7, compared to the usual value about 1.5.The current Swift/BAT to MAXI ratio is about 0.01. Yesterday (September 26) we obtained a 1.8 ks Swift/XRT ToO to measure the actual spectrum of GS 1826-24. This observation also reveals a softer spectrum (http://www.swift.ac.uk/user_objects/tprods/USERPROD_2.110.8.170_1443271067220/spec) than in 2014 June, and the best fit is obtained with a double black-body model with temperatures of 0.6 keV and 1.6 keV.Unlike the previous soft episodes, GS 1826-24 is this time observable with INTEGRAL. The source was well detected by ISGRI during the Galactic Bulge (GB)observation of revolution 1587 at a significance of 29 sigmas in the 18-40 keV energy band, but has remained undetected by ISGRI in the following GB observations (revs. 1589-1592). Recently, GS 1826-24 has only been in JEM-X field of view in four science windows during the Galactic Center observation of rev. 1589. The source was well detected but no burst was observed during this almost 10 ksec exposure.We therefore request a ~30 ksec long observation with INTEGRAL using a couple of hexagonal patterns centered on GS 1826-24 to get an (almost) uninterrupted coverage with JEM-X, and thus ...
Publications	Burst-induced coronal cooling in GS 1826-24. The clock wagging its tail - Sanchez-Fernandez, C., Kajava, J. J. E.,Poutanen, J.,Kuulkers, E.,Suleimanov, V. F. (2020-02-01) http://ui.adsabs.harvard.edu/#abs/2020A&A...634A..58S Diffuse Galactic emission spectrum between 0.5 and 8.0 MeV - Siegert, Thomas, Berteaud, Joanna,Calore, Francesca,Serpico, Pasquale D.,Weinberger, Christoph (2022-04-01) http://ui.adsabs.harvard.edu/#abs/2022A&A...660A.130S Extreme relativistic electron fluxes in the Earths outer radiation belt: Analysis of INTEGRAL IREM data - Meredith, Nigel P., Horne, Richard B.,Sandberg, Ingmar,Papadimitriou, Constantinos,Evans, Hugh D. R. (2017-07-01) http://ui.adsabs.harvard.edu/#abs/2017SpWea..15..917M Gamma-Ray Emission of ⁶⁰Fe and ²⁶Al Radioactivity in Our Galaxy - Wang, W., Siegert, T.,Dai, Z. G.,Diehl, R.,Greiner, J.,Heger, A.,Krause, M.,Lang, M.,Pleintinger, M. M. M.,Zhang, X. L. (2020-02-01) http://ui.adsabs.harvard.edu/#abs/2020ApJ...889..169W INTEGRAL Observations of Magnetars - Pacholski, Dominik Patryk, Ducci, Lorenzo,Topinka, Martin,Mereghetti, Sandro (2025-01-01) http://ui.adsabs.harvard.edu/#abs/2025AN....34640109P INTEGRAL/SPI {$gamma$}-ray line spectroscopy. Response and background characteristics - Diehl, Roland, Siegert, Thomas,Greiner, Jochen,Krause, Martin,Kretschmer, Karsten,Lang, Michael,Pleintinger, Moritz,Strong, Andrew W.,Weinberger, Christoph,Zhang, Xiaoling (2018-03-01) http://ui.adsabs.harvard.edu/#abs/2018A&A...611A..12D Investigation of the energy dependence of the orbital light curve in LS 5039 - Chang, Z., Zhang, S.,Ji, L.,Chen, Y. P.,Kretschmar, P.,Kuulkers, E.,Collmar, W.,Liu, C. Z. (2016-11-01) http://ui.adsabs.harvard.edu/#abs/2016MNRAS.463..495C Low mass X-ray binaries in the Inner Galaxy: implications for millisecond pulsars and the GeV excess - Haggard, Daryl, Heinke, Craig,Hooper, Dan,Linden, Tim (2017-05-01) http://ui.adsabs.harvard.edu/#abs/2017JCAP...05..056H Multi-wavelength Study of HESS J1741-302 - Hare, Jeremy, Rangelov, Blagoy,Sonbas, Eda,Kargaltsev, Oleg,Volkov, Igor (2016-01-01) http://ui.adsabs.harvard.edu/#abs/2016ApJ...816...52H New hard X-ray sources discovered in the ongoing INTEGRAL Galactic plane survey after 14 yr of observations - Krivonos, Roman A., Tsygankov, Sergey S.,Mereminskiy, Ilya A.,Lutovinov, Alexander A.,Sazonov, Sergey Yu.,Sunyaev, Rashid A. (2017-09-01) http://ui.adsabs.harvard.edu/#abs/2017MNRAS.470..512K New interpretation of the two hard X-ray sources IGR J17503-2636 and IGR J17507-2647 - Sidoli, L., Sguera, V.,Esposito, P.,Sathyaprakash, R.,Ponti, G.,Mondal, S.,Bird, A. J. (2025-01-01) http://ui.adsabs.harvard.edu/#abs/2025A&A...693A..45S New Parallaxes of Galactic Cepheids from Spatially Scanning the Hubble Space Telescope: Implications for the Hubble Constant - Riess, Adam G., Casertano, Stefano,Yuan, Wenlong,Macri, Lucas,Anderson, Jay,MacKenty, John W.,Bowers, J. Bradley,Clubb, Kelsey I.,Filippenko, Alexei V.,Jones, David O.,Tucker, Brad E. (2018-03-01) http://ui.adsabs.harvard.edu/#abs/2018ApJ...855..136R Phase-resolved hard X-ray emission of the high-mass binary LS 5039: a spectral hardening above 50 keV detected with INTEGRAL - Falanga, M., Bykov, A. M.,Li, Z.,Krassilchtchikov, A. M.,Petrov, A. E.,Bozzo, E. (2021-10-01) http://ui.adsabs.harvard.edu/#abs/2021A&A...654A.127F Primordial black hole dark matter in the context of extra dimensions - Friedlander, Avi, Mack, Katherine J.,Schon, Sarah,Song, Ningqiang,Vincent, Aaron C. (2022-05-01) http://ui.adsabs.harvard.edu/#abs/2022PhRvD.105j3508F Searching for supergiant fast X-ray transients with Swift - Romano, P., Bozzo, E.,Esposito, P.,Sbarufatti, B.,Haberl, F.,Ponti, G.,D Avanzo, P.,Ducci, L.,Segreto, A.,Jin, C.,Masetti, N.,Del Santo, M.,Campana, S.,Mangano, V. (2016-09-01) http://ui.adsabs.harvard.edu/#abs/2016A&A...593A..96R SRGA J181414.6-225604: A New Galactic Symbiotic X-Ray Binary Outburst Triggered by an Intense Mass-loss Episode of a Heavily Obscured Mira Variable - De, Kishalay, Mereminskiy, Ilya,Soria, Roberto,Conroy, Charlie,Kara, Erin,Anand, Shreya,Ashley, Michael C. B.,Boyer, Martha L.,Chakrabarty, Deepto,Grefenstette, Brian,Hankins, Matthew J.,Hillenbrand, Lynne A.,Jencson, Jacob E.,Karambelkar, Viraj,Kasliwal, Mansi M.,Lau, Ryan M.,Lutovinov, Alexander,Moore, Anna M.,Ng, Mason,Panagiotou, Christos,Pasham, Dheeraj R.,Semena, Andrey,Simcoe, Robert,Soon, Jamie,Srinivasaragavan, Gokul P.,Travouillon, Tony,Yao, Yuhan (2022-08-01) http://ui.adsabs.harvard.edu/#abs/2022ApJ...935...36D ²⁶Al gamma rays from the Galaxy with INTEGRAL/SPI - Pleintinger, Moritz M. M., Diehl, Roland,Siegert, Thomas,Greiner, Jochen,Krause, Martin G. H. (2023-04-01) http://ui.adsabs.harvard.edu/#abs/2023A&A...672A..53P ⁴⁴Ti ejecta in young supernova remnants - Weinberger, Christoph, Diehl, Roland,Pleintinger, Moritz M. M.,Siegert, Thomas,Greiner, Jochen (2020-06-01) http://ui.adsabs.harvard.edu/#abs/2020A&A...638A..83W The 7Be Abundance in Nova V5668 Sgr Is Consistent with the Theory - Chugai, N. N., Kudryashov, A. D. (2020-08-01) http://ui.adsabs.harvard.edu/#abs/2020AstL...46...92C The Galactic Bulge Diffuse Emission in Broadband X-Rays with NuSTAR - Perez, Kerstin, Krivonos, Roman,Wik, Daniel R. (2019-10-01) http://ui.adsabs.harvard.edu/#abs/2019ApJ...884..153P The INTEGRAL/IBIS AGN catalogue: an update - Malizia, A., Landi, R.,Molina, M.,Bassani, L.,Bazzano, A.,Bird, A. J.,Ubertini, P. (2016-07-01) http://ui.adsabs.harvard.edu/#abs/2016MNRAS.460...19M Unveiling the short and faint X-ray transient nature of IGR J17419-2802 - Sguera, V., Sidoli, L. (2024-10-01) http://ui.adsabs.harvard.edu/#abs/2024A&A...690A.260S Water megamaser emission in hard X-ray selected AGN - Panessa, F., Castangia, P.,Malizia, A.,Bassani, L.,Tarchi, A.,Bazzano, A.,Ubertini, P. (2020-09-01) http://ui.adsabs.harvard.edu/#abs/2020A&A...641A.162P XMMU J181227.8-181234: a new ultracompact X-ray binary candidate - Goodwin, A. J., Galloway, D. K.,in t Zand, J. J. M.,Kuulkers, E.,Bilous, A.,Keek, L. (2019-07-01) http://ui.adsabs.harvard.edu/#abs/2019MNRAS.486.4149G X-ray absorption in INTEGRAL active galactic nuclei. Host galaxy inclination - Malizia, A., Bassani, L.,Stephen, J. B.,Bazzano, A.,Ubertini, P. (2020-07-01) http://ui.adsabs.harvard.edu/#abs/2020A&A...639A...5M X-Ray Observations of the Isolated Black Hole Candidate OGLE-2011-BLG-0462 and Other Collapsed Objects Discovered through Gravitational Microlensing - Mereghetti, S., Sidoli, L.,Ponti, G.,Treves, A. (2022-07-01) http://ui.adsabs.harvard.edu/#abs/2022ApJ...934...62M
Temporal Coverage	2015-10-03T04:56:58Z / 2015-10-03T16:15:54Z
Version	1.0
Mission Description	The INTEGRAL (International Gamma-Ray Astrophysics Laboratory) mission, launched by the European Space Agency (ESA) on October 17, 2002, was designed to study high-energy phenomena in the universe. INTEGRAL was operating until february 2025 and it was equipped with three high-energy instruments: the Imager on Board the INTEGRAL Satellite (IBIS), the Spectrometer on INTEGRAL (SPI), and the JEM-X (Joint European Monitor for X-rays). Its Optical Monitoring Camera (OMC) provided optical V-band magnitude measurements, complementing the high-energy observations.
Creator Contact	https://www.cosmos.esa.int/web/integral/helpdesk
Date Published	2025-03-25T09:54:38Z
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Chenevez, 2025, 'Public TOO on GS1826-24', 1.0, European Space Agency, https://doi.org/10.57780/esa-d71vqtw