September 2024 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 35520] LIGO/Virgo/KAGRA S240920dw: Updated Sky localization
by GCN Circulars 24 Sep '24

24 Sep '24

TITLE: GCN CIRCULAR NUMBER: 37599 SUBJECT: LIGO/Virgo/KAGRA S240920dw: Updated Sky localization DATE: 24/09/24 14:28:19 GMT FROM: lucy.thomas(a)ligo.org The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: We have conducted further analysis of the LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S240920dw (GCN Circular 37571). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page: https://gracedb.ligo.org/superevents/S240920dw For the Bilby.multiorder.fits,0 sky map, the 90% credible region is 135 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 977 +/- 160 Mpc (a posteriori mean +/- standard deviation). For further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/. [1] Ashton et al. ApJS 241, 27 (2019) doi:10.3847/1538-4365/ab06fc and Morisaki et al. PRD 108, 123040 (2023) doi:10.1103/PhysRevD.108.123040 View this GCN Circular online at https://gcn.nasa.gov/circulars/37599. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35519] LIGO/Virgo/KAGRA S240921cw: Updated Sky localization
by GCN Circulars 24 Sep '24

24 Sep '24

TITLE: GCN CIRCULAR NUMBER: 37598 SUBJECT: LIGO/Virgo/KAGRA S240921cw: Updated Sky localization DATE: 24/09/24 14:27:43 GMT FROM: Elise Sänger at Max Planck Institute for Gravitational Physics (AEI Potsdam) <elise.sanger(a)ligo.org> The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: We have conducted further analysis of the LIGO Livingston Observatory (L1) and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S240921cw (GCN Circular 37586). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page: https://gracedb.ligo.org/superevents/S240921cw For the Bilby.multiorder.fits,0 sky map, the 90% credible region is 471 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 866 +/- 204 Mpc (a posteriori mean +/- standard deviation). For further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/. [1] Ashton et al. ApJS 241, 27 (2019) doi:10.3847/1538-4365/ab06fc and Morisaki et al. PRD 108, 123040 (2023) doi:10.1103/PhysRevD.108.123040 View this GCN Circular online at https://gcn.nasa.gov/circulars/37598. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35518] LIGO/Virgo/KAGRA S240924a: Updated Sky localization
by GCN Circulars 24 Sep '24

24 Sep '24

TITLE: GCN CIRCULAR NUMBER: 37597 SUBJECT: LIGO/Virgo/KAGRA S240924a: Updated Sky localization DATE: 24/09/24 14:27:40 GMT FROM: Aaron Zimmerman at U. of Texas at Austin <aaron.zimmerman(a)utexas.edu> The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: We have conducted further analysis of the LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S240924a (GCN Circular 37592). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page: https://gracedb.ligo.org/superevents/S240924a For the Bilby.multiorder.fits,0 sky map, the 90% credible region is 660 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 3816 +/- 1285 Mpc (a posteriori mean +/- standard deviation). For further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/. [1] Ashton et al. ApJS 241, 27 (2019) doi:10.3847/1538-4365/ab06fc and Morisaki et al. PRD 108, 123040 (2023) doi:10.1103/PhysRevD.108.123040 View this GCN Circular online at https://gcn.nasa.gov/circulars/37597. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35517] LIGO/Virgo/KAGRA S240920bz: Updated Sky localization and Source Classification
by GCN Circulars 24 Sep '24

24 Sep '24

TITLE: GCN CIRCULAR NUMBER: 37596 SUBJECT: LIGO/Virgo/KAGRA S240920bz: Updated Sky localization and Source Classification DATE: 24/09/24 14:22:14 GMT FROM: jgolomb(a)caltech.edu The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: We have conducted further analysis of the LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S240920bz (GCN Circular 37562). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page: https://gracedb.ligo.org/superevents/S240920bz For the Bilby.multiorder.fits,0 sky map, the 90% credible region is 349 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1372 +/- 305 Mpc (a posteriori mean +/- standard deviation). For further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/. [1] Ashton et al. ApJS 241, 27 (2019) doi:10.3847/1538-4365/ab06fc and Morisaki et al. PRD 108, 123040 (2023) doi:10.1103/PhysRevD.108.123040 View this GCN Circular online at https://gcn.nasa.gov/circulars/37596. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35516] LIGO/Virgo/KAGRA S240923ct: Updated Sky localization and Source Classification
by GCN Circulars 24 Sep '24

24 Sep '24

TITLE: GCN CIRCULAR NUMBER: 37595 SUBJECT: LIGO/Virgo/KAGRA S240923ct: Updated Sky localization and Source Classification DATE: 24/09/24 14:09:30 GMT FROM: Aaron Zimmerman at U. of Texas at Austin <aaron.zimmerman(a)utexas.edu> The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: We have conducted further analysis of the LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate S240923ct (GCN Circular 37591). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page: https://gracedb.ligo.org/superevents/S240923ct After parameter estimation by RapidPE-RIFT [2], the updated classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS (<1%). For the Bilby.multiorder.fits,0 sky map, the 90% credible region is 216 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4025 +/- 1076 Mpc (a posteriori mean +/- standard deviation). For further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/. [1] Ashton et al. ApJS 241, 27 (2019) doi:10.3847/1538-4365/ab06fc and Morisaki et al. PRD 108, 123040 (2023) doi:10.1103/PhysRevD.108.123040 [2] Rose et al. (2022) arXiv:2201.05263 and Pankow et al. PRD 92, 023002 (2015) doi:10.1103/PhysRevD.92.023002 View this GCN Circular online at https://gcn.nasa.gov/circulars/37595. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35515] EP trigger ID 01709059262: correction to the observation start time and source localization
by GCN Circulars 24 Sep '24

24 Sep '24

TITLE: GCN CIRCULAR NUMBER: 37594 SUBJECT: EP trigger ID 01709059262: correction to the observation start time and source localization DATE: 24/09/24 12:52:28 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> M. J. Liu, H. Y. Liu, Z.X. Ling (NAOC, CAS), Y. J. Zhang (THU), J. H. Wu (GZHU), Y. L. Hua (PMO), W. F. Wen (SZTU), H. L.Peng (NNU) The EP-FXT observation start time and source localization given in GCN 37593 are incorrect. The correct observation start time is 2024-09-24T10:32:47 (UTC), and the source localization should be R.A. = 278.807, DEC = 24.588 (J2000). We apologize for the mistake. View this GCN Circular online at https://gcn.nasa.gov/circulars/37594. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35514] EP trigger ID 01709059262: the X-ray transient is likely a stellar flare event
by GCN Circulars 24 Sep '24

24 Sep '24

TITLE: GCN CIRCULAR NUMBER: 37593 SUBJECT: EP trigger ID 01709059262: the X-ray transient is likely a stellar flare event DATE: 24/09/24 12:23:21 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> M. J. Liu, H. Y. Liu, Z.X. Ling (NAOC, CAS), Y. J. Zhang (THU), J. H. Wu (GZHU), Y. L. Hua (PMO), W. F. Wen (SZTU), H. L.Peng (NNU) The Follow-up X-ray Telescope (FXT) on board the Einstein Probe (EP) mission performed an autonomous observation on the X-ray transient detected by EP-WXT (trigger ID 01709059262). The observation started at 2024-09-24T18:32:47 (UTC), about 3 minutes after the EP-WXT trigger time. The FXT onboard data processing system detected a source at R.A. = 289.3937, DEC = 46.1281 (J2000) with an uncertainty of about 20 arcsec (radius, 90% C.L. statistical and systematic), consistent with the position of the WXT transient within the uncertainties. The position of the FXT source is associated with the star 2MASS J18351416+2435115, suggesting that this X-ray transient is likely a stellar flare event. Launched on January 9, 2024, EP is a space X-ray observatory to monitor the soft X-ray sky with X-ray follow-up capability (Yuan et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics). View this GCN Circular online at https://gcn.nasa.gov/circulars/37593. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35513] LIGO/Virgo/KAGRA S240924a: Identification of a GW compact binary merger candidate
by GCN Circulars 24 Sep '24

24 Sep '24

TITLE: GCN CIRCULAR NUMBER: 37592 SUBJECT: LIGO/Virgo/KAGRA S240924a: Identification of a GW compact binary merger candidate DATE: 24/09/24 00:41:05 GMT FROM: Chia-Hsuan Hsiung <sw56540(a)gmail.com> The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: We identified the compact binary merger candidate S240924a during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2024-09-24 00:03:16.546 UTC (GPS time: 1411171414.546). The candidate was found by the cWB [1], cWB BBH [2], GstLAL [3], MBTA [4], PyCBC Live [5], and SPIIR [6] analysis pipelines. S240924a is an event of interest because its false alarm rate, as estimated by the online analysis, is 2.5e-09 Hz, or about one in 12 years. The event's properties can be found at this URL: https://gracedb.ligo.org/superevents/S240924a The classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), BNS (<1%), or NSBH (<1%). Assuming the candidate is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [7] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [7] Both HasNS and HasRemnant consider the support of several neutron star equations of state for maximum neutron star mass. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is <1%. Two sky maps are available at this time and can be retrieved from the GraceDB event page: * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [8], distributed via GCN notice about 25 seconds after the candidate event time. * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [8], distributed via GCN notice about 5 minutes after the candidate event time. The preferred sky map at this time is bayestar.multiorder.fits,1. For the bayestar.multiorder.fits,1 sky map, the 90% credible region is 1326 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4741 +/- 1332 Mpc (a posteriori mean +/- standard deviation). For further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/. [1] Klimenko et al. PRD 93, 042004 (2016) doi:10.1103/PhysRevD.93.042004 [2] T. Mishra et al. PRD 105, 083018 (2022) doi:10.1103/PhysRevD.105.083018 [3] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and Ewing et al. (2023) arXiv:2305.05625 [4] Aubin et al. CQG 38, 095004 (2021) doi:10.1088/1361-6382/abe913 [5] Dal Canton et al. ApJ 923, 254 (2021) doi:10.3847/1538-4357/ac2f9a [6] Chu et al. PRD 105, 024023 (2022) doi:10.1103/PhysRevD.105.024023 [7] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe [8] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013 View this GCN Circular online at https://gcn.nasa.gov/circulars/37592. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35512] LIGO/Virgo/KAGRA S240924a: Identification of a GW compact binary merger candidate
by GCN Circulars 24 Sep '24

24 Sep '24

TITLE: GCN CIRCULAR NUMBER: 37592 SUBJECT: LIGO/Virgo/KAGRA S240924a: Identification of a GW compact binary merger candidate DATE: 24/09/24 00:41:05 GMT FROM: Chia-Hsuan Hsiung <sw56540(a)gmail.com> The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: We identified the compact binary merger candidate S240924a during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2024-09-24 00:03:16.546 UTC (GPS time: 1411171414.546). The candidate was found by the cWB [1], cWB BBH [2], GstLAL [3], MBTA [4], PyCBC Live [5], and SPIIR [6] analysis pipelines. S240924a is an event of interest because its false alarm rate, as estimated by the online analysis, is 2.5e-09 Hz, or about one in 12 years. The event's properties can be found at this URL: https://gracedb.ligo.org/superevents/S240924a The classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), BNS (<1%), or NSBH (<1%). Assuming the candidate is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [7] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [7] Both HasNS and HasRemnant consider the support of several neutron star equations of state for maximum neutron star mass. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is <1%. Two sky maps are available at this time and can be retrieved from the GraceDB event page: * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [8], distributed via GCN notice about 25 seconds after the candidate event time. * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [8], distributed via GCN notice about 5 minutes after the candidate event time. The preferred sky map at this time is bayestar.multiorder.fits,1. For the bayestar.multiorder.fits,1 sky map, the 90% credible region is 1326 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4741 +/- 1332 Mpc (a posteriori mean +/- standard deviation). For further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/. [1] Klimenko et al. PRD 93, 042004 (2016) doi:10.1103/PhysRevD.93.042004 [2] T. Mishra et al. PRD 105, 083018 (2022) doi:10.1103/PhysRevD.105.083018 [3] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and Ewing et al. (2023) arXiv:2305.05625 [4] Aubin et al. CQG 38, 095004 (2021) doi:10.1088/1361-6382/abe913 [5] Dal Canton et al. ApJ 923, 254 (2021) doi:10.3847/1538-4357/ac2f9a [6] Chu et al. PRD 105, 024023 (2022) doi:10.1103/PhysRevD.105.024023 [7] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe [8] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013 View this GCN Circular online at https://gcn.nasa.gov/circulars/37592. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 35511] LIGO/Virgo/KAGRA S240923ct: Identification of a GW compact binary merger candidate
by GCN Circulars 23 Sep '24

23 Sep '24

TITLE: GCN CIRCULAR NUMBER: 37591 SUBJECT: LIGO/Virgo/KAGRA S240923ct: Identification of a GW compact binary merger candidate DATE: 24/09/23 21:17:26 GMT FROM: Dripta Bhattacharjee <dripta.bhattacharjee(a)ligo.org> The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: We identified the compact binary merger candidate S240923ct during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2024-09-23 20:40:06.105 UTC (GPS time: 1411159224.105). The candidate was found by the cWB [1], cWB BBH [2], GstLAL [3], MBTA [4], PyCBC Live [5], and SPIIR [6] analysis pipelines. S240923ct is an event of interest because its false alarm rate, as estimated by the online analysis, is 7.6e-16 Hz, or about one in 1e8 years. The event's properties can be found at this URL: https://gracedb.ligo.org/superevents/S240923ct The classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS (<1%). Assuming the candidate is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [7] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [7] Both HasNS and HasRemnant consider the support of several neutron star equations of state for maximum neutron star mass. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is <1%. Two sky maps are available at this time and can be retrieved from the GraceDB event page: * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [8], distributed via GCN notice about 24 seconds after the candidate event time. * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [8], distributed via GCN notice about 5 minutes after the candidate event time. The preferred sky map at this time is bayestar.multiorder.fits,1. For the bayestar.multiorder.fits,1 sky map, the 90% credible region is 523 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4814 +/- 1191 Mpc (a posteriori mean +/- standard deviation). For further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/. [1] Klimenko et al. PRD 93, 042004 (2016) doi:10.1103/PhysRevD.93.042004 [2] T. Mishra et al. PRD 105, 083018 (2022) doi:10.1103/PhysRevD.105.083018 [3] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and Ewing et al. (2023) arXiv:2305.05625 [4] Aubin et al. CQG 38, 095004 (2021) doi:10.1088/1361-6382/abe913 [5] Dal Canton et al. ApJ 923, 254 (2021) doi:10.3847/1538-4357/ac2f9a [6] Chu et al. PRD 105, 024023 (2022) doi:10.1103/PhysRevD.105.024023 [7] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe [8] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013 View this GCN Circular online at https://gcn.nasa.gov/circulars/37591. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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