A dataset provided by the European Space Agency

Name: INTEGRAL TOO on MAXI J1305-704
Published: 2025-03-25T09:54:37Z

Proposal ID	0970001
Obs ID	09700010001
Title	INTEGRAL TOO on MAXI J1305-704
Download Data Associated to the proposal	https://isla.esac.esa.int/tap/download/bundle?format=ascii_curl&product_id=prop_id:0970001
DOI	https://doi.org/10.57780/esa-bem6f35
Author	Sanchez-Fernandez
Abstract	MAXI J1305-704 is a new X-ray transient recently discovered by MAXI (ATel #4024, #4035). On April 10 the Swift/BAT flux was ~25 mCrab (15-50 keV; ATel #4034). Since then, it rose up to ~50 mCrab and it isnow seen at a plateau at ~30 mCrab. A Swift/XRT spectrum on April 11 could be described by either a power-law with photon index ~2 or an absorbed thermal disk model, with kT~1.2 keV. The large optical amplitude, the blue optical SED and the initial hard X-ray spectrum point to a black hole being the compact object (ATel #4030). A hard-to-soft state transition occurred on April 9/10, alsosuggestive of a black hole (ATel #4044). The non-detection of strong X-ray variability on April 11 supports the current soft-state interpretation. However, as noted in ATels #4035 and 4044, a neutron star can still not be ruled out. Swift/XRT observations on April 14 also revealed absorption dips, possibly at a period of ~1.5 hours, which would be the shorterst orbital period seen so far for a black hole candidate. In order to verify the nature of the compact object, we request 2 TOO observations of 50 ksec each to be executed asap. These observations provide the high energy coverage (IBIS & SPI) to allow the detection of a potential hard energy tail. The long uninterrupted observations allow us to verify with JEM-X the presence of X-ray dips; if observed they will help in scrutinizing the orbital period. The long observation will also maximize the chance to detect any type I X-ray burst, which would rule out a black hole, but point to a neutron star. We, therefore, request the observations to be done in the HEX pattern. We are aware that INTEGRAL TOO proposals do exist in the AO9 proposal database. However, these are for objects for which the compact object nature has been established. Since it is uncertain at the moment, they cannot be triggered. As waiting to get a firm answer on that could be too late, we suggest to observe the source now, when it is still bright.
Publications	Accurate localization and identification of six hard X-ray sources from Chandra and XMM-Newton data - Karasev, D. I., Lutovinov, A. A.,Revnivtsev, M. G.,Krivonos, R. A. (2012-10-01) http://ui.adsabs.harvard.edu/#abs/2012AstL...38..629K Background modelling for I3-ray spectroscopy with INTEGRAL/SPI - Siegert, Thomas, Diehl, Roland,Weinberger, Christoph,Pleintinger, Moritz M. M.,Greiner, Jochen,Zhang, Xiaoling (2019-06-01) http://ui.adsabs.harvard.edu/#abs/2019A&A...626A..73S Comparing simulated ²⁶Al maps to gamma-ray measurements - Pleintinger, Moritz M. M., Siegert, Thomas,Diehl, Roland,Fujimoto, Yusuke,Greiner, Jochen,Krause, Martin G. H.,Krumholz, Mark R. (2019-12-01) http://ui.adsabs.harvard.edu/#abs/2019A&A...632A..73P Constraints on positron annihilation kinematics in the inner Galaxy - Siegert, Thomas, Crocker, Roland M.,Diehl, Roland,Krause, Martin G. H.,Panther, Fiona H.,Pleintinger, Moritz M. M.,Weinberger, Christoph (2019-07-01) http://ui.adsabs.harvard.edu/#abs/2019A&A...627A.126S 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 Discovery of blue companions to two southern Cepheids: WW Car and FN Vel - Kovtyukh, V., Szabados, L.,Chekhonadskikh, F.,Lemasle, B.,Belik, S. (2015-04-01) http://ui.adsabs.harvard.edu/#abs/2015MNRAS.448.3567K Dose Measured On-Board INTEGRAL After More Than 12 Years in Space - Claret, Arnaud, Laurent, Philippe,Sauvageon, Aymeric,Savchenko, Volodymyr (2015-12-01) http://ui.adsabs.harvard.edu/#abs/2015ITNS...62.2784C Ephemeris, orbital decay, and masses of ten eclipsing high-mass X-ray binaries - Falanga, M., Bozzo, E.,Lutovinov, A.,Bonnet-Bidaud, J. M.,Fetisova, Y.,Puls, J. (2015-05-01) http://ui.adsabs.harvard.edu/#abs/2015A&A...577A.130F 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 Galactic survey of ⁴⁴Ti sources with the IBIS telescope onboard INTEGRAL - Tsygankov, Sergey S., Krivonos, Roman A.,Lutovinov, Alexander A.,Revnivtsev, Mikhail G.,Churazov, Eugene M.,Sunyaev, Rashid A.,Grebenev, Sergey A. (2016-06-01) http://ui.adsabs.harvard.edu/#abs/2016MNRAS.458.3411T 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 Gamma-ray spectroscopy of positron annihilation in the Milky Way - Siegert, Thomas, Diehl, Roland,Khachatryan, Gerasim,Krause, Martin G. H.,Guglielmetti, Fabrizia,Greiner, Jochen,Strong, Andrew W.,Zhang, Xiaoling (2016-02-01) http://ui.adsabs.harvard.edu/#abs/2016A&A...586A..84S INTEGRAL 11-year hard X-ray survey above 100 keV - Krivonos, R., Tsygankov, S.,Lutovinov, A.,Revnivtsev, M.,Churazov, E.,Sunyaev, R. (2015-04-01) http://ui.adsabs.harvard.edu/#abs/2015MNRAS.448.3766K 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 Investigating the true nature of three hard X-ray sources - Molina, M., Malizia, A.,Masetti, N.,Bassani, L.,Bazzano, A.,Bird, A. J.,Fiocchi, M.,Palazzi, E.,Ubertini, P. (2021-11-01) http://ui.adsabs.harvard.edu/#abs/2021MNRAS.507.3423M Leptonic origin of the 100 MeV γ-ray emission from the Galactic centre - Malyshev, D., Chernyakova, M.,Neronov, A.,Walter, R. (2015-10-01) http://ui.adsabs.harvard.edu/#abs/2015A&A...582A..11M 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 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 Prolonged sub-luminous state of the new transitional pulsar candidate CXOU J110926.4-650224 - Coti Zelati, Francesco, Papitto, Alessandro,de Martino, Domitilla,Buckley, David A. H.,Odendaal, Alida,Li, Jian,Russell, Thomas D.,Torres, Diego F.,Mazzola, Simona M.,Bozzo, Enrico,Gromadzki, Mariusz,Campana, Sergio,Rea, Nanda,Ferrigno, Carlo,Migliari, Simone (2019-02-01) http://ui.adsabs.harvard.edu/#abs/2019A&A...622A.211C RT Crucis: a look into the X-ray emission of a peculiar symbiotic star - Ducci, L., Doroshenko, V.,Suleimanov, V.,Nikolajuk, M.,Santangelo, A.,Ferrigno, C. (2016-07-01) http://ui.adsabs.harvard.edu/#abs/2016A&A...592A..58D Search for 511 keV emission in satellite galaxies of the Milky Way with INTEGRAL/SPI - Siegert, Thomas, Diehl, Roland,Vincent, Aaron C.,Guglielmetti, Fabrizia,Krause, Martin G. H.,Boehm, Celine (2016-10-01) http://ui.adsabs.harvard.edu/#abs/2016A&A...595A..25S Searching for γ-Ray Blazar Candidates among the Unidentified INTEGRAL Sources - Massaro, F., Paggi, A.,D Abrusco, R.,Tosti, G. (2012-05-01) http://ui.adsabs.harvard.edu/#abs/2012ApJ...750L..35M 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 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 Galactic ²⁶Al Emission Map as Revealed by INTEGRAL SPI - Bouchet, Laurent, Jourdain, Elisabeth,Roques, Jean-Pierre (2015-03-01) http://ui.adsabs.harvard.edu/#abs/2015ApJ...801..142B 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 The INTEGRAL/IBIS AGN catalogue - I. X-ray absorption properties versus optical classification - Malizia, A., Bassani, L.,Bazzano, A.,Bird, A. J.,Masetti, N.,Panessa, F.,Stephen, J. B.,Ubertini, P. (2012-11-01) http://ui.adsabs.harvard.edu/#abs/2012MNRAS.426.1750M Type I X-ray Bursts Detected by the JEM-X Telescope Onboard the INTEGRAL Observatory in 2003-2015 - Chelovekov, I. V., Grebenev, S. A.,Mereminskiy, I. A.,Prosvetov, A. V. (2017-12-01) http://ui.adsabs.harvard.edu/#abs/2017AstL...43..781C Unveiling the nature of INTEGRAL objects through optical spectroscopy. X. A new multi-year, multi-observatory campaign - Masetti, N., Parisi, P.,Palazzi, E.,Jimenez-Bailon, E.,Chavushyan, V.,McBride, V.,Rojas, A. F.,Steward, L.,Bassani, L.,Bazzano, A.,Bird, A. J.,Charles, P. A.,Galaz, G.,Landi, R.,Malizia, A.,Mason, E.,Minniti, D.,Morelli, L.,Schiavone, F.,Stephen, J. B.,Ubertini, P. (2013-08-01) http://ui.adsabs.harvard.edu/#abs/2013A&A...556A.120M VerticaVertical position of the Sun with gamma-rays - Siegert, Thomas, (2019-12-01) http://ui.adsabs.harvard.edu/#abs/2019A&A...632L...1S 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 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
Temporal Coverage	2012-04-19T04:58:17Z / 2012-04-19T17:19:45Z
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	2025-03-25T09:54:37Z
Publisher And Registrant	European Space Agency
Credit Guidelines	European Space Agency, Sanchez-Fernandez, 2025, 'INTEGRAL TOO on MAXI J1305-704', 1.0, European Space Agency, https://doi.org/10.57780/esa-bem6f35