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"Terrestrial": 0.9513039641448672
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-02T12:55:24Z",
"superevent_id": "S230802ar",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-02T12:55:25.691710Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-02T12:55:25.691747Z",
"modified": "2023-08-02T12:55:25.713792Z"
}
}
],
"references": []
},
{
"event_id": "S230802a",
"sequences": [],
"references": [
{
"id": 1824,
"topic": "gcn.circular",
"uuid": "1650c327-3610-450d-bc13-c77fe1a533c6",
"title": "LIGO/Virgo/KAGRA S230802aq: Updated Sky localization and EM Bright Classification",
"submitter": "Hop gcn.circular",
"authors": "carl.haster@unlv.edu",
"data": {
"date": "23/08/04 23:08:50 GMT",
"from": "carl.haster@unlv.edu",
"title": "GCN CIRCULAR",
"number": "34336",
"subject": "LIGO/Virgo/KAGRA S230802aq: Updated Sky localization and EM Bright Classification"
},
"message_text": "We have conducted further analysis of the LIGO Hanford Observatory (H1) data around the time of the compact binary merger (CBC) candidate S230802aq (GCN Circular 34314). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.offline0.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S230802aq\n\nBased on posterior support from parameter estimation [1], under the assumption that the candidate S230802aq is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is 9%. [2] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [2] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassgap) is 62%.\n\nFor the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible region is 25885 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 576 +/- 246 Mpc (a posteriori mean +/- standard deviation).\n\nFor 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/userguide/.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMTkwNTM1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.J8rjZ0IqhMNfXi24UW-FLzLfpvm7KayhQ5lf8klfNvw\n\n",
"published": "2023-08-04T23:09:00.394802Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-04T23:09:00.394821Z",
"modified": "2023-08-04T23:09:00.398302Z",
"targets": []
},
{
"id": 1804,
"topic": "gcn.circular",
"uuid": "bfbbddfa-a011-4c25-944e-a72277537b2a",
"title": "LIGO/Virgo/KAGRA S230802aq: AstroSat CZTI non-detection and upper limits",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "23/08/03 05:28:49 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"title": "GCN CIRCULAR",
"number": "34327",
"subject": "LIGO/Virgo/KAGRA S230802aq: AstroSat CZTI non-detection and upper limits"
},
"message_text": "G. Waratkar (IITB), V. Bhalerao (IITB), M. Dixit (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (TIFR), S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:\n\nWe have carried out a search for X-ray candidates in Astrosat CZTI data in a 100-sec window around the trigger time of the event S230802aq (UTC 2023-08-02 11:33:59, GraceDB event). We use the bayestar.multiorder.fits,0 map (https://gracedb.ligo.org/api/superevents/S230802aq/files/bayestar.multiorder.fits,0) for our analysis. CZTI is a coded aperture mask instrument that has a considerable effective area for about 29% of the entire sky but is also sensitive to brighter transients from the entire sky. At the time of the merger, Astrosat's nominal pointing is RA, DEC = 17:22:28.7, -41:35:57.7 (260.6196,-41.5994), which is ~128 deg away from the maximum probability location. At the time of the merger event, the Earth-satellite-transient angle corresponding to the maximum probability location is ~53 deg and is occulted by Earth in the satellite's frame. In a time interval of 100 sec around the event, the region of the localization map not occulted by Earth in the satellite's frame has a total probability of 0.70 (70%) of containing the source.\n\nCZTI data were de-trended to remove orbit-wise background variation. We then searched data from the four independent, identical quadrants for coincident spikes in the count rates. Searches were undertaken by binning the data in 0.1s, 1s, and 10s respectively. Statistical fluctuations in background count rates were estimated by using data from 5 preceding orbits. We selected confidence levels such that the probability of a false trigger in a 100-sec window is 10^-4. We do not find any evidence for any hard X-ray transient in this window, in the CZTI energy range of 20-200 keV.\n\nWe use a detailed mass model of the satellite to calculate the direction-dependent instrument response for points in the visible sky. We then assume the source is modeled as a power law with photon index alpha = -1, and convert our count rate upper limits to direction-dependent flux limits. We obtain the following upper limits for source flux in the 20-200 keV band by taking a probability-weighted mean over the visible sky:\n\n0.1 s: flux limit= 1.68e-05 ergs/cm^2/s; fluence limit = 1.68e-06 ergs/cm^2\n1.0 s: flux limit= 3.31e-06 ergs/cm^2/s; fluence limit = 3.31e-06 ergs/cm^2\n10.0 s: flux limit= 3.84e-07 ergs/cm^2/s; fluence limit = 3.84e-06 ergs/cm^2\n\nCZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.\n\nCZTI GRB detections are reported regularly on the payload site at:\nhttp://astrosat.iucaa.in/czti/?q=emgw\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMDQwNTM1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.bnwPZIL8feYU5oKRnwHANgHv-4uJfNRSfU96HnCUWdk\n\n",
"published": "2023-08-03T05:29:02.894406Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-03T05:29:02.894435Z",
"modified": "2023-08-03T05:29:02.902696Z",
"targets": []
},
{
"id": 1794,
"topic": "gcn.circular",
"uuid": "d78572a4-9dfb-4019-b14b-d9dd2b87b748",
"title": "LIGO/Virgo/KAGRA S230802aq: Upper limits from Fermi-GBM Observations",
"submitter": "Hop gcn.circular",
"authors": "Joshua Wood at NASA/MSFC <joshua.r.wood@nasa.gov>",
"data": {
"date": "23/08/02 20:57:42 GMT",
"from": "Joshua Wood at NASA/MSFC <joshua.r.wood@nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34319",
"subject": "LIGO/Virgo/KAGRA S230802aq: Upper limits from Fermi-GBM Observations"
},
"message_text": "J. Wood (NASA/MSFC) and J. Mangan (CNRS/IJCLab) report on behalf of the Fermi-GBM Team:\n\nFor S230802aq (GCN 34314) and using the initial bayestar skymap, Fermi-GBM was observing 59.4% of the localization probability at event time.\n\nThere was no Fermi-GBM onboard trigger around the event time of the LIGO/Virgo/KAGRA (LVK) detection of GW trigger S230802aq. An automated, blind search for short gamma-ray bursts below the onboard triggering threshold in Fermi-GBM also identified no counterpart candidates. The GBM targeted search, the most sensitive, coherent search for GRB-like signals, was run from +/-30 s around merger time, and also identified no counterpart candidates.\n\nPart of the LVK localization region is behind the Earth for Fermi, located at an RA35.9, Dec%.3 with a radius of 67.6 degrees. We therefore set upper limits on impulsive gamma-ray emission for the GW localization region visible to Fermi at merger time. Using the representative soft, normal, and hard GRB-like templates described in arXiv:1612.02395, we set the following 3 sigma flux upper limits over 10-1000 keV, weighted by GW localization probability (in units of 10^-7 erg/s/cm^2):\n\nTimescale Soft Normal Hard\n------------------------------------\n0.128 s: 1.2 2.1 4.6\n1.024 s: 0.3 0.6 1.3\n8.192 s: 0.1 0.1 0.2\n\nAssuming the a posteriori mean luminosity distance of 444 Mpc from the GW detection, we estimate the following intrinsic luminosity upper limits over the 1 keV-10 MeV energy range (in units of 10^48 erg/s):\n\nTimescale Soft Normal Hard\n------------------------------------\n0.128s: 4.3 7.0 25.\n1.024s: 1.0 2.1 7.1\n8.192s: 0.3 0.4 1.3\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMDA5ODY4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.v5Psk3kSHLoJNpP1szsSpGOlqYZ1xaO_Pjv9Ho9XR3w\n\n",
"published": "2023-08-02T20:57:54.083247Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-02T20:57:54.083280Z",
"modified": "2023-08-02T20:57:54.091746Z",
"targets": []
},
{
"id": 1791,
"topic": "gcn.circular",
"uuid": "a402a5ab-45f4-4c86-8b4b-28d97cdb8b6b",
"title": "LIGO/Virgo S230802aq: No counterpart candidates in INTEGRAL SPI-ACS prompt observation",
"submitter": "Hop gcn.circular",
"authors": "Volodymyr Savchenko at ISDC, University of Geneva; LASTRO, EPFL <volodymyr.savchenko@unige.ch>",
"data": {
"date": "23/08/02 15:00:06 GMT",
"from": "Volodymyr Savchenko at ISDC, University of Geneva; LASTRO, EPFL <volodymyr.savchenko@unige.ch>",
"title": "GCN CIRCULAR",
"number": "34316",
"subject": "LIGO/Virgo S230802aq: No counterpart candidates in INTEGRAL SPI-ACS prompt observation"
},
"message_text": "V. Savchenko, C. Ferrigno (ISDC/UniGE, Switzerland)\nJ. Rodi (IAPS-Roma, Italy)\nA. Coleiro (APC, France)\nS. Mereghetti (INAF IASF-Milano, Italy)\n\non behalf of the INTEGRAL multi-messenger collaboration:\nhttps://www.astro.unige.ch/cdci/integral-multimessenger-collaboration\n\nUsing INTEGRAL/SPI-ACS realtime data (following [1]) we have performed\na search for a prompt gamma-ray counterpart of S230802aq (GCN 34314).\n\nAt the time of the event (2023-08-02 11:33:59 UTC, hereafter T0), INTEGRAL was operating in nominal mode. The peak of the event localization probability was at an angle of 75 deg with respect to the spacecraft pointing axis. This orientation implies strongly suppressed (21% of optimal) response of ISGRI, somewhat suppressed (44% of optimal) response of IBIS/Veto, and near-optimal (89% of optimal) response of SPI-ACS.\nWe note that due to large localization uncertainty, sensitivity is strongly dependent on the actual source location within the uncertainty.\n\nThe background within +/-300 seconds around the event was rather stable (excess variance 1.2).\n\nWe have performed a search for any impulsive events in INTEGRAL SPI-ACS (as described in [2]) data.\n\nWe do not detect any significant counterparts and estimate a 3-sigma upper limit on the 75-2000 keV fluence of 1.8e-07 erg/cm^2 (within the 50% probability containment region of the source localization) for a burst lasting less than 1 s with a characteristic short GRB spectrum (an exponentially cut off power law with alpha=-0.5 and Ep`0 keV) occurring at any time in the interval within 300 s around T0. For a typical long GRB spectrum (Band function with alpha=-1, beta=-2.5, and Ep00 keV), the derived peak flux upper limit is ~1.5e-07 (4.2e-08) erg/cm^2/s at 1 s (8 s) time scale in 75-2000 keV energy range.\n\nWe report for completeness and in order of FAP, all excesses identified in the search region. We find: 6 likely background\nexcesses:\n\nT-T0 | scale | S/N | flux ( x 1e-06 erg/cm2/s) | FAP\n13.9 | 0.05 | 4.2 | 1.77 +/- 0.528 +/- 1.39 | 0.402\n92.8 | 1.15 | 3.6 | 0.323 +/- 0.106 +/- 0.253 | 0.46\n-3.22 | 0.05 | 3.3 | 1.4 +/- 0.523 +/- 1.1 | 0.516\n252 | 2.5 | 3.5 | 2.14 +/- 0.72 +/- 1.68 | 0.695\n-14 | 0.1 | 3.6 | 1.08 +/- 0.367 +/- 0.843 | 0.782\n73.7 | 0.35 | 3.8 | 0.606 +/- 0.194 +/- 0.475 | 0.865\n\nNote that FAP estimates (especially at timescales above 2s) may be possibly further affected by enhanced non-stationary local background noise. This list excludes any excesses for which FAP is close to unity.\n\nWe note that no independent IBAS alerts happened in the viscinity.\n\n\nAll results quoted are preliminary.\n\nThis circular is an official product of the INTEGRAL Multi-Messenger team.\n\nNote that we send GCNs Circulars only when one of the following\nconditions is met: merger contains at least one neutron star, a\nsingificant counterpart is reported.\n\n[1] Savchenko et al. 2017, A&A 603, A46 [2] Savchenko et al. 2012, A&A\n541A, 122S\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwOTg4NDEyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.w-BCGdD9qFmICU4KuGW_ZnPZzDZYF5ehu2wnXimvYbU\n\n",
"published": "2023-08-02T15:00:22.797299Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-02T15:00:22.797316Z",
"modified": "2023-08-02T15:00:22.803973Z",
"targets": []
},
{
"id": 1789,
"topic": "gcn.circular",
"uuid": "6c1e0507-9347-4e52-8078-ad2ccd23c914",
"title": "LIGO/Virgo/KAGRA S230802aq: Coverage and upper limits from MAXI/GSC observations",
"submitter": "Hop gcn.circular",
"authors": "Motoko Serino at Aoyama Gakuin U. <serino@phys.aoyama.ac.jp>",
"data": {
"date": "23/08/02 14:23:47 GMT",
"from": "Motoko Serino at Aoyama Gakuin U. <serino@phys.aoyama.ac.jp>",
"title": "GCN CIRCULAR",
"number": "34315",
"subject": "LIGO/Virgo/KAGRA S230802aq: Coverage and upper limits from MAXI/GSC observations"
},
"message_text": "T. Mihara, N. Kawai (RIKEN),\nH. Negoro, M. Nakajima (Nihon U.),\nS. Sugita, M. Serino, H. Hiramatsu, H. Nishikawa, Y. Kondo (AGU),\nY. Kawakubo (LSU)\nreport on behalf of the MAXI team:\n\nWe examined MAXI/GSC all-sky X-ray images (2-20 keV)\nafter compact binary merger candidate S230802aq at 2023-08-02 11:33:59 UTC (GCN #34314).\n\nAt the trigger time of S230802aq, the high-voltage of MAXI/GSC was on.\nThe instantaneous field of view of GSC at the GW trigger time covered 1% of the 90% credible region\nof the bayestar sky map, in which we found no significant new X-ray source.\nThe first one-orbit (92 min) scan observation with GSC after the event covered 62%\nof the 90% credible region of the bayestar skymap from 11:33:59 to 13:05:58 UTC (T0+0 to T0+5519 sec).\n\nNo significant new source was found in the region in the one-orbit scan observation.\nA typical 1-sigma averaged upper limit obtained in one scan observation\nis 20 mCrab at 2-20 keV.\n\nIf you require information about X-ray flux by MAXI/GSC at specific coordinates,\nplease contact the submitter of this circular by email.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwOTg2MjMzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.XZOYfhQYGYyRTgwLFVbO9YHylaCQwwO4XGT7umgFp6w\n\n",
"published": "2023-08-02T14:23:58.357418Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-02T14:23:58.357442Z",
"modified": "2023-08-02T14:23:58.364661Z",
"targets": []
},
{
"id": 1787,
"topic": "gcn.circular",
"uuid": "1a5cb9a2-7160-4ad1-a17d-d409737eeafb",
"title": "LIGO/Virgo/KAGRA S230802aq: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "bolliand@fresnel.fr",
"data": {
"date": "23/08/02 12:53:54 GMT",
"from": "bolliand@fresnel.fr",
"title": "GCN CIRCULAR",
"number": "34314",
"subject": "LIGO/Virgo/KAGRA S230802aq: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S230802aq during\nreal-time processing of data from LIGO Hanford Observatory (H1) at\n2023-08-02 11:33:59.961 UTC (GPS time: 1375011257.961). The candidate\nwas found by the GstLAL [1] analysis pipeline.\n\nS230802aq is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 2.2e-08 Hz, or about one in 1\nyear, 5 months. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230802aq\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (90%), NSBH (6%), Terrestrial (3%), or BNS (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is 57%. [2] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [2] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat either of the binary components lies between 3 and 5 solar masses\n(HasMassGap) is 68%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by\nBAYESTAR [3], distributed via GCN notice about 26 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [3], distributed via GCN notice about 5 minutes after the\ncandidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,1. For\nthe bayestar.multiorder.fits,1 sky map, the 90% credible region is\n24221 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 444 +/- 156 Mpc (a posteriori mean +/-\nstandard deviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\nhttps://emfollow.docs.ligo.org/userguide/.\n\n [1] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [2] Chatterjee et al. ApJ 896, 54 (2020)\n [3] Singer & Price PRD 93, 024013 (2016)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkwOTgwODQwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.9FDOO9wmEKNlWLadkxHIZdLDJ8F7QKR1UYVQc61cg50\n\n",
"published": "2023-08-02T12:54:05.494478Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-02T12:54:05.494496Z",
"modified": "2023-08-02T12:54:05.500820Z",
"targets": []
}
]
},
{
"event_id": "S230803d",
"sequences": [
{
"id": 1001,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1802,
"topic": "igwn.gwalert",
"uuid": "9621bcc9-953c-46cd-afb7-dcd17d5d33ea",
"title": "S230803d - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230803d/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230803d/view/"
},
"event": {
"far": 1.141323282384785e-06,
"time": "2023-08-03T03:34:12.417Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1087.7245641936727,
"area_90": 4284.594058803007,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.04264138160689884,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "95f7e5dc9abc21584563379f9c53e4a0",
"classification": {
"BBH": 0.626109394041368,
"BNS": 5.3686106590968215e-14,
"NSBH": 3.717582986250523e-12,
"Terrestrial": 0.3738906059548607
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-03T03:34:38Z",
"superevent_id": "S230803d",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-03T03:34:39.328305Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-03T03:34:39.328348Z",
"modified": "2023-08-03T03:34:39.335416Z"
}
},
{
"id": 1002,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1803,
"topic": "igwn.gwalert",
"uuid": "30512bad-c995-4a54-839c-52440f9a974d",
"title": "S230803d - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230803d/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230803d/view/"
},
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"message_text": "Samuele Ronchini (PSU), Gayathri Raman (PSU), Aaron Tohuvavohu (U Toronto), James DeLaunay (U Alabama), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:\n\nSwift/BAT was observing 83.45% of the GW localization probability (bayestar.multiorder.fits) at merger time. A fraction 31.75 % of the GW localization posterior is contained inside the BAT coded FoV.\n\nThe LVK notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1).\n\nUpon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground.\n\nUsing the NITRATES analysis (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), we searched for emission on 8 timescales from 0.128s to 16.384s in the interval [-20,+20] seconds around the merger time. We find no evidence for a signal, and derive the following upper limits.\n\nWe quote the 5-sigma flux upper limits in the 15-350 keV band, weighted over the GW localization, for four spectral templates (soft, normal, and hard GRB-like templates described in [arXiv:1612.02395], and spectral shape from GRB170817A [arXiv:1710.05446]) and for four time bins.\nIn units of 10^-7 erg/s/cm^2:\n\ntime_bin (s) soft normal hard GRB170817\n-------------------------------\n0.256 12.0 7.8 6.8 8.8\n1.024 6.1 4.0 3.5 4.5\n4.096 3.3 2.1 1.9 2.4\n16.384 2.0 1.3 1.1 1.5\n\n\nThe upper limits as function of sky position are plotted here, alongside the GW localization:\nhttps://doi.org/10.5281/zenodo.8219098\nThe solid and dashed lines indicate the 90% and 50% GW contour levels, respectively.\n\nThe corresponding fits file can be found here:\nhttps://doi.org/10.5281/zenodo.8219106\n\nGUANO is a fully autonomous, extremely low latency, spacecraft\ncommanding pipeline designed for targeted recovery of BAT event mode\ndata around the times of compelling astrophysical events to enable\nmore sensitive GRB searches.\n\nA live reporting of Swift/BAT event data recovered by GUANO can be\nfound at: https://www.swift.psu.edu/guano/\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNDIzOTMzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.kP9NRtdzTsIM_KUKuSj7EA73ssWwvU1-9ahjtE7ifWM\n\n",
"published": "2023-08-07T15:58:58.140361Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-07T15:58:58.140384Z",
"modified": "2023-08-07T15:58:58.147355Z",
"targets": []
},
{
"id": 1859,
"topic": "gcn.circular",
"uuid": "6284ab91-b75d-47d7-aad1-c5f6f636a9cd",
"title": "LIGO/Virgo/KAGRA S230805x: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "John Veitch at U of Glasgow <john.veitch@ligo.org>",
"data": {
"date": "23/08/05 12:55:52 GMT",
"from": "John Veitch at U of Glasgow <john.veitch@ligo.org>",
"title": "GCN CIRCULAR",
"number": "34340",
"subject": "LIGO/Virgo/KAGRA S230805x: Updated Sky localization"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe 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 S230805x (GCN Circular 34337). 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:\nhttps://gracedb.ligo.org/superevents/S230805x\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 2094 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 3305 +/- 1113 Mpc (a posteriori mean +/- standard deviation).\n\nFor 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/userguide/.\n\n [1] Ashton et al. ApJS 241, 27 (2019)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMjQwMTU3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.RL0svDHKsPG6NvBpCCR4H9g8iUthRjN2DXSt3bgC6wU\n\n",
"published": "2023-08-05T12:56:02.332547Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-05T12:56:02.332564Z",
"modified": "2023-08-05T12:56:02.335945Z",
"targets": []
},
{
"id": 1839,
"topic": "gcn.circular",
"uuid": "23c4c320-b83d-4c94-a44f-360e755f8974",
"title": "LIGO/Virgo/KAGRA S230805x: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "ê³½ê·ì§ <kyujin.kwak.72@gmail.com>",
"data": {
"date": "23/08/05 04:40:29 GMT",
"from": "ê³½ê·ì§ <kyujin.kwak.72@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34337",
"subject": "LIGO/Virgo/KAGRA S230805x: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S230805x during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-08-05 03:42:49.972 UTC (GPS\ntime: 1375242187.972). The candidate was found by the CWB [1], GstLAL\n[2], MBTA [3], PyCBC Live [4], and SPIIR [5] analysis pipelines.\n\nS230805x is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 9.2e-09 Hz, or about one in 3\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230805x\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (>99%), Terrestrial (<1%), BNS (<1%), or NSBH\n(<1%).\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is <1%. [6] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [6] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat either of the binary components lies between 3 and 5 solar masses\n(HasMassgap) is <1%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 26 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 5 minutes after the\ncandidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,1. For\nthe bayestar.multiorder.fits,1 sky map, the 90% credible region is\n2235 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 3852 +/- 1193 Mpc (a posteriori mean\n+/- standard deviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\nhttps://emfollow.docs.ligo.org/userguide/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n [2] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [3] Aubin et al. CQG 38, 095004 (2021)\n [4] Dal Canton et al. ApJ 923, 254 (2021)\n [5] Chu et al. PRD 105, 024023 (2022)\n [6] Chatterjee et al. ApJ 896, 54 (2020)\n [7] Singer & Price PRD 93, 024013 (2016)\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMjEwNDM1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.JzvLMZI9kFBbL3OYVSycHAf2cTTkdDeahyL-HZA0rJg\n\n",
"published": "2023-08-05T04:40:43.808997Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-05T04:40:43.809016Z",
"modified": "2023-08-05T04:40:43.812639Z",
"targets": []
}
]
},
{
"event_id": "S230805z",
"sequences": [
{
"id": 1024,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1836,
"topic": "igwn.gwalert",
"uuid": "fcf391e9-306b-4490-9e8d-599cbb15ff3f",
"title": "S230805z - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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},
"event": {
"far": 5.854e-06,
"time": "2023-08-05T04:10:13.265Z",
"group": "Burst",
"search": "AllSky",
"area_50": 132.6083959433644,
"area_90": 521.2013536761345,
"duration": 0.00779,
"pipeline": "CWB",
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],
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"classification": {},
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},
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"sequence_num": 1,
"time_created": "2023-08-05T04:11:42Z",
"superevent_id": "S230805z",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-05T04:11:42.352090Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-05T04:11:42.352110Z",
"modified": "2023-08-05T04:11:42.357125Z"
}
},
{
"id": 1025,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1837,
"topic": "igwn.gwalert",
"uuid": "c836a750-5f62-4029-a537-71f070dcdfac",
"title": "S230805z - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230805z/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230805z/view/"
},
"event": {
"far": 5.854e-06,
"time": "2023-08-05T04:10:13.265Z",
"group": "Burst",
"search": "AllSky",
"area_50": 132.6083959433644,
"area_90": 521.2013536761345,
"duration": 0.00779,
"pipeline": "CWB",
"properties": {},
"instruments": [
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],
"significant": false,
"skymap_hash": "3d096cbc9adc543c743deb1d3ded9013",
"classification": {},
"skymap_version": 0,
"central_frequency": 279.889465
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-05T04:16:26Z",
"superevent_id": "S230805z",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-05T04:16:28.140262Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-05T04:16:28.140282Z",
"modified": "2023-08-05T04:16:28.143850Z"
}
}
],
"references": []
},
{
"event_id": "S230805ae",
"sequences": [
{
"id": 1027,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1840,
"topic": "igwn.gwalert",
"uuid": "366a2216-8b49-462a-bfde-271c52d3c13d",
"title": "S230805ae - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230805ae/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230805ae/view/"
},
"event": {
"far": 1.67124e-05,
"time": "2023-08-05T04:40:32.926Z",
"group": "Burst",
"search": "BBH",
"area_50": 2975.295972273587,
"area_90": 10523.903017302822,
"duration": 0.029856,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "204089e0445fbd781913c5f265578279",
"classification": {},
"skymap_version": 0,
"central_frequency": 44.042858
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-05T04:41:42Z",
"superevent_id": "S230805ae",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-05T04:41:44.150431Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-05T04:41:44.150452Z",
"modified": "2023-08-05T04:41:44.153880Z"
}
},
{
"id": 1028,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1841,
"topic": "igwn.gwalert",
"uuid": "ec8f8189-068b-4433-9f6d-685b772704f3",
"title": "S230805ae - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230805ae/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230805ae/view/"
},
"event": {
"far": 1.67124e-05,
"time": "2023-08-05T04:40:32.926Z",
"group": "Burst",
"search": "BBH",
"area_50": 2975.295972273587,
"area_90": 10523.903017302822,
"duration": 0.029856,
"pipeline": "CWB",
"properties": {},
"instruments": [
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"L1"
],
"significant": false,
"skymap_hash": "204089e0445fbd781913c5f265578279",
"classification": {},
"skymap_version": 0,
"central_frequency": 44.042858
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-05T04:46:17Z",
"superevent_id": "S230805ae",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-05T04:46:17.919617Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-05T04:46:17.919635Z",
"modified": "2023-08-05T04:46:17.922991Z"
}
}
],
"references": []
},
{
"event_id": "S230805ak",
"sequences": [
{
"id": 1029,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1842,
"topic": "igwn.gwalert",
"uuid": "a315a14c-40cd-49f4-88d8-5183e0c9655c",
"title": "S230805ak - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230805ak/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230805ak/view/"
},
"event": {
"far": 7.09544e-06,
"time": "2023-08-05T06:04:22.756Z",
"group": "CBC",
"search": "AllSky",
"area_50": 487.6296078676881,
"area_90": 1900.7902829919906,
"duration": null,
"pipeline": "MBTA",
"properties": {
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"HasMassGap": 0.24767626746153393,
"HasRemnant": 0.9162386150956999
},
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"L1"
],
"significant": false,
"skymap_hash": "268af1ea25e62880870a5f6bd522a47f",
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"BNS": 0.0,
"NSBH": 0.00253094,
"Terrestrial": 0.99746906
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-05T06:04:56Z",
"superevent_id": "S230805ak",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-05T06:04:57.170023Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-05T06:04:57.170045Z",
"modified": "2023-08-05T06:04:57.175608Z"
}
},
{
"id": 1030,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1843,
"topic": "igwn.gwalert",
"uuid": "f66f74f2-2fa2-4558-a1b0-95b3f0b1655f",
"title": "S230805ak - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230805ak/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230805ak/view/"
},
"event": {
"far": 7.09544e-06,
"time": "2023-08-05T06:04:22.756Z",
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"area_50": 487.6296078676881,
"area_90": 1900.7902829919906,
"duration": null,
"pipeline": "MBTA",
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},
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"BNS": 0.0,
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},
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"sequence_num": 2,
"time_created": "2023-08-05T06:09:31Z",
"superevent_id": "S230805ak",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-05T06:09:32.916601Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-05T06:09:32.916622Z",
"modified": "2023-08-05T06:09:32.920029Z"
}
}
],
"references": []
},
{
"event_id": "S230805as",
"sequences": [
{
"id": 1031,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1844,
"topic": "igwn.gwalert",
"uuid": "59ef8946-3974-4e2e-80c3-1363d19b6724",
"title": "S230805as - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230805as/view/"
},
"event": {
"far": 1.2955038163333733e-06,
"time": "2023-08-05T07:13:19.798Z",
"group": "Burst",
"search": "AllSky",
"area_50": 66.95989613200341,
"area_90": 507.9824787640588,
"duration": 0.001685298069504045,
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"sequence_num": 1,
"time_created": "2023-08-05T07:26:14Z",
"superevent_id": "S230805as",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-05T07:26:16.052623Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-05T07:26:16.052644Z",
"modified": "2023-08-05T07:26:16.058264Z"
}
},
{
"id": 1032,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1846,
"topic": "igwn.gwalert",
"uuid": "d29dafaa-4008-454c-82b5-fe94811245af",
"title": "S230805as - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230805as/files/olib.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230805as/view/"
},
"event": {
"far": 1.2955038163333733e-06,
"time": "2023-08-05T07:13:19.798Z",
"group": "Burst",
"search": "AllSky",
"area_50": 66.95989613200341,
"area_90": 507.9824787640588,
"duration": 0.001685298069504045,
"pipeline": "oLIB",
"properties": {},
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"L1"
],
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"time": "2023-08-06T20:40:41.939Z",
"group": "CBC",
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"area_50": 792.2932010793418,
"area_90": 3691.2134516387123,
"duration": null,
"pipeline": "gstlal",
"properties": {
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"HasMassGap": 0.02944733044733045,
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},
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"L1"
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"significant": true,
"skymap_hash": "d8824746f9798698e910790d06a4bd87",
"classification": {
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"BNS": 7.479200166588101e-20,
"NSBH": 5.727717200326568e-18,
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},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-06T20:41:16Z",
"superevent_id": "S230806ak",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-06T20:41:18.008601Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-06T20:41:18.008624Z",
"modified": "2023-08-06T20:41:18.018130Z"
}
},
{
"id": 1057,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1884,
"topic": "igwn.gwalert",
"uuid": "b9fa1bce-263d-4018-a6cb-9ce6e3fb2ff8",
"title": "S230806ak - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230806ak/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230806ak/view/"
},
"event": {
"far": 2.958345677553754e-09,
"time": "2023-08-06T20:40:41.938Z",
"group": "CBC",
"search": "AllSky",
"area_50": 813.6951890322265,
"area_90": 3749.124713158283,
"duration": null,
"pipeline": "gstlal",
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"instruments": [
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"significant": true,
"skymap_hash": "f9c9a0e5a2c49f09299de1564dcdf042",
"classification": {
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"BNS": 6.68974377854143e-20,
"NSBH": 2.678582929871309e-09,
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"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-06T20:45:59Z",
"superevent_id": "S230806ak",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-06T20:46:00.724474Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-06T20:46:00.724508Z",
"modified": "2023-08-06T20:46:00.730160Z"
}
},
{
"id": 1058,
"sequence_number": 3,
"sequence_type": "INITIAL",
"message": {
"id": 1885,
"topic": "igwn.gwalert",
"uuid": "a4d5ffa8-5cc2-4794-98dd-820e2d16310d",
"title": "S230806ak - INITIAL",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230806ak/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230806ak/view/"
},
"event": {
"far": 2.958345677553754e-09,
"time": "2023-08-06T20:40:41.938Z",
"group": "CBC",
"search": "AllSky",
"area_50": 813.6951890322265,
"area_90": 3749.124713158283,
"duration": null,
"pipeline": "gstlal",
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"significant": true,
"skymap_hash": "f9c9a0e5a2c49f09299de1564dcdf042",
"classification": {
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"BNS": 5.7962854931910026e-11,
"NSBH": 3.050659316362472e-06,
"Terrestrial": 0.019159358805871197
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "INITIAL",
"sequence_num": 3,
"time_created": "2023-08-06T21:07:04Z",
"superevent_id": "S230806ak",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-06T21:07:05.307664Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-06T21:07:05.307686Z",
"modified": "2023-08-06T21:07:05.314826Z"
}
},
{
"id": 1059,
"sequence_number": 4,
"sequence_type": "UPDATE",
"message": {
"id": 1890,
"topic": "igwn.gwalert",
"uuid": "4c3d5fc8-577d-4463-9cd9-0936bdc3c5a5",
"title": "S230806ak - UPDATE",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230806ak/files/bayestar.multiorder.fits,2",
"gracedb": "https://gracedb.ligo.org/superevents/S230806ak/view/"
},
"event": {
"far": 2.958345677553754e-09,
"time": "2023-08-06T20:40:41.938Z",
"group": "CBC",
"search": "AllSky",
"area_50": 790.6146137889192,
"area_90": 3714.713673704625,
"duration": null,
"pipeline": "gstlal",
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"HasRemnant": 0.0
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"significant": true,
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"BNS": 6.68974377854143e-20,
"NSBH": 2.678582929871309e-09,
"Terrestrial": 0.0025755885500925446
},
"skymap_version": 2,
"central_frequency": null
},
"alert_type": "UPDATE",
"sequence_num": 4,
"time_created": "2023-08-07T00:58:05Z",
"superevent_id": "S230806ak",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-07T00:58:07.149547Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-07T00:58:07.149566Z",
"modified": "2023-08-07T00:58:07.154589Z"
}
}
],
"references": []
},
{
"event_id": "S230806a",
"sequences": [],
"references": [
{
"id": 1891,
"topic": "gcn.circular",
"uuid": "8653c9b6-d17d-4e92-a9ca-57e84f49aec7",
"title": "LIGO/Virgo/KAGRA S230806ak: Updated Sky localization and EM Bright Classification",
"submitter": "Hop gcn.circular",
"authors": "carl.haster@unlv.edu",
"data": {
"date": "23/08/07 01:03:02 GMT",
"from": "carl.haster@unlv.edu",
"title": "GCN CIRCULAR",
"number": "34355",
"subject": "LIGO/Virgo/KAGRA S230806ak: Updated Sky localization and EM Bright Classification"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe 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 S230806ak (GCN Circular 34352). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.offline0.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S230806ak\n\nBased on posterior support from parameter estimation [1], under the assumption that the candidate S230806ak is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [2] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [2] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassgap) is <1%.\n\nFor the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible region is 3715 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 5423 +/- 1862 Mpc (a posteriori mean +/- standard deviation).\n\nFor 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/userguide/.\n\n\n [1] Ashton et al. ApJS 241, 27 (2019)\n [2] Chatterjee et al. ApJ 896, 54 (2020)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMzcwMTg3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.MXY4pmkh1NzHMkYrQE9ZFz-WTzwHUYTL2ubIualrFro\n\n",
"published": "2023-08-07T01:03:13.912533Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-07T01:03:13.912550Z",
"modified": "2023-08-07T01:03:13.917777Z",
"targets": []
},
{
"id": 1886,
"topic": "gcn.circular",
"uuid": "c54c2468-331f-457e-ac79-e8f437716319",
"title": "LIGO/Virgo/KAGRA S230806ak: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Dripta Bhattacharjee <dripta.bhattacharjee@ligo.org>",
"data": {
"date": "23/08/06 21:27:57 GMT",
"from": "Dripta Bhattacharjee <dripta.bhattacharjee@ligo.org>",
"title": "GCN CIRCULAR",
"number": "34352",
"subject": "LIGO/Virgo/KAGRA S230806ak: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S230806ak during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-08-06 20:40:41.938 UTC (GPS\ntime: 1375389659.938). The candidate was found by the CWB [1], GstLAL\n[2], MBTA [3], PyCBC Live [4], and SPIIR [5] analysis pipelines.\n\nS230806ak is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 3e-09 Hz, or about one in 10\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230806ak\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is <1%. [6] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [6] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat either of the binary components lies between 3 and 5 solar masses\n(HasMassgap) is 3%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 35 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 5 minutes after the\ncandidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,2. For\nthe bayestar.multiorder.fits,2 sky map, the 90% credible region is\n3749 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 4578 +/- 1473 Mpc (a posteriori mean\n+/- standard deviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\nhttps://emfollow.docs.ligo.org/userguide/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n [2] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [3] Aubin et al. CQG 38, 095004 (2021)\n [4] Dal Canton et al. ApJ 923, 254 (2021)\n [5] Chu et al. PRD 105, 024023 (2022)\n [6] Chatterjee et al. ApJ 896, 54 (2020)\n [7] Singer & Price PRD 93, 024013 (2016)\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxMzU3MjgyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.7uGFsn4SRzNGy7QZnzDlUspLuKGUeCwY2W2IzQrzznE\n\n",
"published": "2023-08-06T21:28:08.056763Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-06T21:28:08.056779Z",
"modified": "2023-08-06T21:28:08.063889Z",
"targets": []
}
]
},
{
"event_id": "S230807f",
"sequences": [
{
"id": 1060,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1896,
"topic": "igwn.gwalert",
"uuid": "824abf82-3415-4ab2-be5d-9d4a48015302",
"title": "S230807f - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230807f/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230807f/view/"
},
"event": {
"far": 7.141757350979996e-08,
"time": "2023-08-07T20:50:45.416Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1932.683441510015,
"area_90": 6087.396808716594,
"duration": null,
"pipeline": "gstlal",
"properties": {
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"HasMassGap": 0.04264138160689884,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "a50a800cb00b980d220e91b359ca696b",
"classification": {
"BBH": 0.9531444746139138,
"BNS": 7.709956723248038e-16,
"NSBH": 5.975891496337405e-14,
"Terrestrial": 0.046855525386025665
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-07T20:51:21Z",
"superevent_id": "S230807f",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-07T20:51:23.595849Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-07T20:51:23.595872Z",
"modified": "2023-08-07T20:51:23.604893Z"
}
},
{
"id": 1061,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1897,
"topic": "igwn.gwalert",
"uuid": "27dae775-147d-4f16-8f02-906bae527d41",
"title": "S230807f - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230807f/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230807f/view/"
},
"event": {
"far": 7.141757350979996e-08,
"time": "2023-08-07T20:50:45.416Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1932.683441510015,
"area_90": 6087.396808716594,
"duration": null,
"pipeline": "gstlal",
"properties": {
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"HasMassGap": 0.04264138160689884,
"HasRemnant": 0.0
},
"instruments": [
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"L1"
],
"significant": true,
"skymap_hash": "a50a800cb00b980d220e91b359ca696b",
"classification": {
"BBH": 0.9531444746139138,
"BNS": 7.709956723248038e-16,
"NSBH": 5.975891496337405e-14,
"Terrestrial": 0.046855525386025665
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-07T20:56:06Z",
"superevent_id": "S230807f",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-07T20:56:07.181801Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-07T20:56:07.181832Z",
"modified": "2023-08-07T20:56:07.187976Z"
}
},
{
"id": 1062,
"sequence_number": 3,
"sequence_type": "INITIAL",
"message": {
"id": 1898,
"topic": "igwn.gwalert",
"uuid": "44ea7624-3dde-41ca-9ca5-7e7dfc9bb595",
"title": "S230807f - INITIAL",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230807f/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230807f/view/"
},
"event": {
"far": 7.141757350979996e-08,
"time": "2023-08-07T20:50:45.416Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1932.683441510015,
"area_90": 6087.396808716594,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.04264138160689884,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "a50a800cb00b980d220e91b359ca696b",
"classification": {
"BBH": 0.8637835798930218,
"BNS": 3.673354129049579e-09,
"NSBH": 2.7150471143635476e-08,
"Terrestrial": 0.13621638928315288
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "INITIAL",
"sequence_num": 3,
"time_created": "2023-08-07T21:15:33Z",
"superevent_id": "S230807f",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-07T21:15:34.707817Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-07T21:15:34.707841Z",
"modified": "2023-08-07T21:15:34.716252Z"
}
},
{
"id": 1067,
"sequence_number": 4,
"sequence_type": "UPDATE",
"message": {
"id": 1908,
"topic": "igwn.gwalert",
"uuid": "1d39d847-3a1a-4ab2-a53f-0ca4e4b1d133",
"title": "S230807f - UPDATE",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230807f/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230807f/view/"
},
"event": {
"far": 7.141757350979996e-08,
"time": "2023-08-07T20:50:45.416Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1560.4567098588623,
"area_90": 5436.104940032728,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "5317d53a10468cb3138930fd0141c66c",
"classification": {
"BBH": 0.9531444746139138,
"BNS": 7.709956723248038e-16,
"NSBH": 5.975891496337405e-14,
"Terrestrial": 0.046855525386025665
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "UPDATE",
"sequence_num": 4,
"time_created": "2023-08-08T02:49:48Z",
"superevent_id": "S230807f",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-08T02:49:49.839818Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-08T02:49:49.839848Z",
"modified": "2023-08-08T02:49:49.846010Z"
}
}
],
"references": [
{
"id": 1925,
"topic": "gcn.circular",
"uuid": "b707c027-dee7-4038-b44c-478caf13e4af",
"title": "The Fermi GBM Trigger 713134237 / 230807868 is not associated with LIGO/Virgo/KAGRA S230807f.",
"submitter": "Hop gcn.circular",
"authors": "Sarah Dalessi at UAH <sd0104@uah.edu>",
"data": {
"date": "23/08/08 18:26:24 GMT",
"from": "Sarah Dalessi at UAH <sd0104@uah.edu>",
"title": "GCN CIRCULAR",
"number": "34372",
"subject": "The Fermi GBM Trigger 713134237 / 230807868 is not associated with LIGO/Virgo/KAGRA S230807f."
},
"message_text": "S. Dalessi (UAH) reports on behalf of the Fermi-GBM Team:\n\nAt 20:50:32.62 on 07 August 2023, the Fermi Gamma-ray Burst Monitor triggered onboard to the event labeled as 713134237 / 230807868 this trigger occurred 15s before the LVK Event S230807f (GCN 34360).\n\nThe trigger is likely due to a solar flare and therefore is not associated to S230807f.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNTE5MTkwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.sxBQ2RYDTRPTJHjm4O07QmufhabpGpDqyy7ospIzRjM\n\n",
"published": "2023-08-08T18:26:35.071762Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-08T18:26:35.071833Z",
"modified": "2023-08-08T18:26:35.081633Z",
"targets": []
},
{
"id": 1909,
"topic": "gcn.circular",
"uuid": "526856e0-8cfc-4f9c-ac4c-f0a48c2e124c",
"title": "LIGO/Virgo/KAGRA S230807f: Updated Sky localization and EM Bright Classification",
"submitter": "Hop gcn.circular",
"authors": "carl.haster@unlv.edu",
"data": {
"date": "23/08/08 02:53:38 GMT",
"from": "carl.haster@unlv.edu",
"title": "GCN CIRCULAR",
"number": "34365",
"subject": "LIGO/Virgo/KAGRA S230807f: Updated Sky localization and EM Bright Classification"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe 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 S230807f (GCN Circular 34360). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.offline0.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S230807f\n\nBased on posterior support from parameter estimation [1], under the assumption that the candidate S230807f is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [2] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [2] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassgap) is <1%.\n\nFor the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible region is 5436 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 5272 +/- 1900 Mpc (a posteriori mean +/- standard deviation).\n\nFor 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/userguide/.\n\n\n [1] Ashton et al. ApJS 241, 27 (2019)\n [2] Chatterjee et al. ApJ 896, 54 (2020)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNDYzMjI0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.9rLmOhPUUswez1-uEnV_5HvXlmId3mjdJNKLPUpa-U8\n\n",
"published": "2023-08-08T02:53:49.625738Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-08T02:53:49.625756Z",
"modified": "2023-08-08T02:53:49.631579Z",
"targets": []
},
{
"id": 1901,
"topic": "gcn.circular",
"uuid": "6755d0dd-693b-49d8-8bec-dd107a0377e3",
"title": "LIGO/Virgo/KAGRA S230807f: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Dripta Bhattacharjee <dripta.bhattacharjee@ligo.org>",
"data": {
"date": "23/08/07 21:46:40 GMT",
"from": "Dripta Bhattacharjee <dripta.bhattacharjee@ligo.org>",
"title": "GCN CIRCULAR",
"number": "34360",
"subject": "LIGO/Virgo/KAGRA S230807f: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S230807f during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-08-07 20:50:45.416 UTC (GPS\ntime: 1375476663.416). The candidate was found by the CWB [1], GstLAL\n[2], MBTA [3], PyCBC Live [4], and SPIIR [5] analysis pipelines.\n\nS230807f is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 7.1e-08 Hz, or about one in 5\nmonths. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230807f\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (86%), Terrestrial (14%), NSBH (<1%), or BNS\n(<1%).\n\nThere was a high rate of noise transients (glitches) in both the LIGO\nLivingston and Hanford detectors which may affect the parameters or the significance\nof the candidate.\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is <1%. [6] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [6] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat either of the binary components lies between 3 and 5 solar masses\n(HasMassgap) is 4%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 35 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 5 minutes after the\ncandidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,2. For\nthe bayestar.multiorder.fits,2 sky map, the 90% credible region is\n6088 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 6818 +/- 2379 Mpc (a posteriori mean\n+/- standard deviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\nhttps://emfollow.docs.ligo.org/userguide/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n [2] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [3] Aubin et al. CQG 38, 095004 (2021)\n [4] Dal Canton et al. ApJ 923, 254 (2021)\n [5] Chu et al. PRD 105, 024023 (2022)\n [6] Chatterjee et al. ApJ 896, 54 (2020)\n [7] Singer & Price PRD 93, 024013 (2016)\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNDQ0ODA1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.B-yzwefh2S-1h2Ra7OaFIiO18HVyksvS6zmgv-Ne5KI\n\n",
"published": "2023-08-07T21:46:50.744594Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-07T21:46:50.744615Z",
"modified": "2023-08-07T21:46:50.753408Z",
"targets": []
}
]
},
{
"event_id": "S230807k",
"sequences": [
{
"id": 1063,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1899,
"topic": "igwn.gwalert",
"uuid": "8360e8ed-19e9-4845-aa1a-147d13a429e8",
"title": "S230807k - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"event": {
"far": 1.308967875957023e-05,
"time": "2023-08-07T21:16:24.647Z",
"group": "CBC",
"search": "AllSky",
"area_50": 296.00837749541347,
"area_90": 1509.0499740896782,
"duration": null,
"pipeline": "spiir",
"properties": {
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"significant": false,
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},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-07T21:16:55Z",
"superevent_id": "S230807k",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-07T21:16:56.916026Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-07T21:16:56.916071Z",
"modified": "2023-08-07T21:16:56.922645Z"
}
},
{
"id": 1064,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1900,
"topic": "igwn.gwalert",
"uuid": "754e5696-6e3d-49e6-baf5-10e3080d647e",
"title": "S230807k - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230807k/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230807k/view/"
},
"event": {
"far": 1.308967875957023e-05,
"time": "2023-08-07T21:16:24.647Z",
"group": "CBC",
"search": "AllSky",
"area_50": 296.00837749541347,
"area_90": 1509.0499740896782,
"duration": null,
"pipeline": "spiir",
"properties": {
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"HasMassGap": 0.0,
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"instruments": [
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"significant": false,
"skymap_hash": "36b18a9012dde5750b9824b4dc809e81",
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},
"skymap_version": 0,
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},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-07T21:21:30Z",
"superevent_id": "S230807k",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-07T21:21:31.673821Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-07T21:21:31.673842Z",
"modified": "2023-08-07T21:21:31.679718Z"
}
}
],
"references": []
},
{
"event_id": "S230808b",
"sequences": [
{
"id": 1065,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1905,
"topic": "igwn.gwalert",
"uuid": "827886e7-03e7-4843-8405-07e6bb61151a",
"title": "S230808b - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230808b/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230808b/view/"
},
"event": {
"far": 5.461165786612623e-06,
"time": "2023-08-08T01:07:48.314Z",
"group": "CBC",
"search": "AllSky",
"area_50": 591.0725496399643,
"area_90": 2843.5268699754333,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 0.3206388049097414,
"HasMassGap": 0.08033637465120842,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "580b4968286e5c3006bacb85ece94586",
"classification": {
"BBH": 0.0023702561720514003,
"BNS": 0.0,
"NSBH": 0.004087050169594436,
"Terrestrial": 0.9935426936583541
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-08T01:08:13Z",
"superevent_id": "S230808b",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-08T01:08:14.533573Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-08T01:08:14.533593Z",
"modified": "2023-08-08T01:08:14.539602Z"
}
},
{
"id": 1066,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1906,
"topic": "igwn.gwalert",
"uuid": "9883804e-391a-426c-a132-e327c7b6ae95",
"title": "S230808b - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230808b/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230808b/view/"
},
"event": {
"far": 5.461165786612623e-06,
"time": "2023-08-08T01:07:48.314Z",
"group": "CBC",
"search": "AllSky",
"area_50": 591.0725496399643,
"area_90": 2843.5268699754333,
"duration": null,
"pipeline": "pycbc",
"properties": {
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"HasMassGap": 0.08033637465120842,
"HasRemnant": 0.0
},
"instruments": [
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"L1"
],
"significant": false,
"skymap_hash": "580b4968286e5c3006bacb85ece94586",
"classification": {
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"BNS": 0.0,
"NSBH": 0.004087050169594436,
"Terrestrial": 0.9935426936583541
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-08T01:12:48Z",
"superevent_id": "S230808b",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-08T01:12:49.043254Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-08T01:12:49.043275Z",
"modified": "2023-08-08T01:12:49.049375Z"
}
}
],
"references": []
},
{
"event_id": "S230808e",
"sequences": [
{
"id": 1068,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1910,
"topic": "igwn.gwalert",
"uuid": "01631b7e-a8da-4889-93d6-5056129bb060",
"title": "S230808e - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230808e/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230808e/view/"
},
"event": {
"far": 2.27313e-05,
"time": "2023-08-08T03:57:07.804Z",
"group": "Burst",
"search": "AllSky",
"area_50": 759.9803957387118,
"area_90": 4418.251571802886,
"duration": 0.009485,
"pipeline": "CWB",
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],
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"skymap_hash": "0a084d4ad3f69ee855b7ce7e27f8c1d2",
"classification": {},
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"sequence_num": 1,
"time_created": "2023-08-08T03:58:52Z",
"superevent_id": "S230808e",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-08T03:58:53.614582Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-08T03:58:53.614612Z",
"modified": "2023-08-08T03:58:53.622546Z"
}
},
{
"id": 1069,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1911,
"topic": "igwn.gwalert",
"uuid": "24493a23-2a13-4ec5-ba2d-68981fff8c62",
"title": "S230808e - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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},
"event": {
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"time": "2023-08-08T03:57:07.804Z",
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"sequence_num": 2,
"time_created": "2023-08-08T04:03:27Z",
"superevent_id": "S230808e",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-08T04:03:28.313422Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-08T04:03:28.313444Z",
"modified": "2023-08-08T04:03:28.319477Z"
}
}
],
"references": []
},
{
"event_id": "S230808h",
"sequences": [
{
"id": 1070,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1912,
"topic": "igwn.gwalert",
"uuid": "e37e9040-6b67-479f-99c5-a5c81dafde12",
"title": "S230808h - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230808h/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230808h/view/"
},
"event": {
"far": 9.13639608910518e-06,
"time": "2023-08-08T04:03:31.005Z",
"group": "CBC",
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"pipeline": "gstlal",
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"HasRemnant": 0.0
},
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],
"significant": false,
"skymap_hash": "e9d41ea98290b540a6ee53d30c021353",
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"BNS": 1.3352442840363573e-22,
"NSBH": 1.198999105331091e-20,
"Terrestrial": 0.8231109885168801
},
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},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-08T04:03:57Z",
"superevent_id": "S230808h",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-08T04:03:58.426849Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-08T04:03:58.426886Z",
"modified": "2023-08-08T04:03:58.435555Z"
}
},
{
"id": 1072,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1914,
"topic": "igwn.gwalert",
"uuid": "5488293f-86fc-4b84-b814-6ba77af5e594",
"title": "S230808h - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230808h/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230808h/view/"
},
"event": {
"far": 9.13639608910518e-06,
"time": "2023-08-08T04:03:31.005Z",
"group": "CBC",
"search": "AllSky",
"area_50": 986.3798565344241,
"area_90": 3531.747659048591,
"duration": null,
"pipeline": "gstlal",
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"significant": false,
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"classification": {
"BBH": 0.17688901148311986,
"BNS": 1.3352442840363573e-22,
"NSBH": 1.198999105331091e-20,
"Terrestrial": 0.8231109885168801
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-08T04:08:32Z",
"superevent_id": "S230808h",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-08T04:08:34.200260Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-08T04:08:34.200283Z",
"modified": "2023-08-08T04:08:34.206161Z"
}
}
],
"references": []
},
{
"event_id": "S230808i",
"sequences": [
{
"id": 1071,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1913,
"topic": "igwn.gwalert",
"uuid": "97ee0765-310c-4d26-97ac-ea8298def034",
"title": "S230808i - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230808i/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230808i/view/"
},
"event": {
"far": 6.85142e-11,
"time": "2023-08-08T04:03:46.430Z",
"group": "Burst",
"search": "BBH",
"area_50": 2257.6999056180393,
"area_90": 7195.264420395335,
"duration": 0.018072,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "c614160e7268916b9215cadf880b6aa9",
"classification": {},
"skymap_version": 0,
"central_frequency": 53.462563
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-08T04:06:36Z",
"superevent_id": "S230808i",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-08T04:06:37.909513Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-08T04:06:37.909533Z",
"modified": "2023-08-08T04:06:37.915675Z"
}
},
{
"id": 1073,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1915,
"topic": "igwn.gwalert",
"uuid": "211eefea-b138-441c-be73-85affe3c7dc6",
"title": "S230808i - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230808i/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230808i/view/"
},
"event": {
"far": 6.85142e-11,
"time": "2023-08-08T04:03:46.430Z",
"group": "Burst",
"search": "BBH",
"area_50": 2257.6999056180393,
"area_90": 7195.264420395335,
"duration": 0.018072,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "c614160e7268916b9215cadf880b6aa9",
"classification": {},
"skymap_version": 0,
"central_frequency": 53.462563
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-08T04:11:12Z",
"superevent_id": "S230808i",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-08T04:11:12.663484Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-08T04:11:12.663506Z",
"modified": "2023-08-08T04:11:12.669523Z"
}
},
{
"id": 1076,
"sequence_number": 3,
"sequence_type": "RETRACTION",
"message": {
"id": 1919,
"topic": "igwn.gwalert",
"uuid": "321fa465-7475-46d3-b11b-b60cc9aedd73",
"title": "S230808i - RETRACTION",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S230808i/view/"
},
"event": null,
"alert_type": "RETRACTION",
"sequence_num": 3,
"time_created": "2023-08-08T08:05:27Z",
"superevent_id": "S230808i",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-08T08:05:28.771598Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-08T08:05:28.771619Z",
"modified": "2023-08-08T08:05:28.779488Z"
}
}
],
"references": [
{
"id": 1920,
"topic": "gcn.circular",
"uuid": "d26a51c8-782d-4633-8aab-a578fce678e9",
"title": "LIGO/Virgo/KAGRA S230808i: retraction of a GW unmodeled transient candidate",
"submitter": "Hop gcn.circular",
"authors": "Shivaraj Kandhasamy at Inter-University Centre for Astronomy and Astrophysics (LVK collaboration) <shivaraj@iucaa.in>",
"data": {
"date": "23/08/08 08:05:45 GMT",
"from": "Shivaraj Kandhasamy at Inter-University Centre for Astronomy and Astrophysics (LVK collaboration) <shivaraj@iucaa.in>",
"title": "GCN CIRCULAR",
"number": "34367",
"subject": "LIGO/Virgo/KAGRA S230808i: retraction of a GW unmodeled transient candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nThe trigger S230808i is no longer considered to be a candidate of interest: pipeline experts consider this trigger is of low significance.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNDgxOTUwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Kda-JuDOITzC5LDAEf4KiJcdPKzRpiY556wGYVqpgSk\n\n",
"published": "2023-08-08T08:05:55.983616Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-08T08:05:55.983634Z",
"modified": "2023-08-08T08:05:55.990594Z",
"targets": []
},
{
"id": 1916,
"topic": "gcn.circular",
"uuid": "34f3c269-9798-4cb4-aee1-6ac986eb417b",
"title": "LIGO/Virgo/KAGRA S230808i: Identification of a GW unmodeled transient candidate",
"submitter": "Hop gcn.circular",
"authors": "Shivaraj Kandhasamy at Inter-University Centre for Astronomy and Astrophysics (LVK collaboration) <shivaraj@iucaa.in>",
"data": {
"date": "23/08/08 05:18:56 GMT",
"from": "Shivaraj Kandhasamy at Inter-University Centre for Astronomy and Astrophysics (LVK collaboration) <shivaraj@iucaa.in>",
"title": "GCN CIRCULAR",
"number": "34366",
"subject": "LIGO/Virgo/KAGRA S230808i: Identification of a GW unmodeled transient candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe identified the unmodeled transient candidate S230808i during real-\ntime processing of data from LIGO Hanford Observatory (H1) and LIGO\nLivingston Observatory (L1) at 2023-08-08 04:03:46.430 UTC (GPS time:\n1375502644.430). The candidate was found by the CWB [1] analysis\npipeline.\n\nS230808i is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 6.9e-11 Hz, or about one in 1e3\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230808i\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * cwb.multiorder.fits,0, an initial localization generated by cWB\n[1], distributed via GCN notice about 2 minutes after the candidate\nevent time.\n * cwb.multiorder.fits,1, an initial localization generated by cWB\n[1], distributed via GCN notice about 7 minutes after the candidate\nevent time.\n\nThe preferred sky map at this time is cwb.multiorder.fits,1. For the\ncwb.multiorder.fits,1 sky map, the 90% credible region is 7195 deg2.\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\nhttps://emfollow.docs.ligo.org/userguide/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNDcxOTQyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.4BGkZZUppGSFAen10MN1Dx57lGuXTN_FeYTZAd-_eYI\n\n",
"published": "2023-08-08T05:19:11.523778Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-08T05:19:11.523797Z",
"modified": "2023-08-08T05:19:11.531182Z",
"targets": []
}
]
},
{
"event_id": "S230808r",
"sequences": [
{
"id": 1074,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1917,
"topic": "igwn.gwalert",
"uuid": "f235d5d1-b4c2-4ef2-a89b-ebdf96548eb0",
"title": "S230808r - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230808r/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230808r/view/"
},
"event": {
"far": 2.125354257192313e-05,
"time": "2023-08-08T06:30:36.690Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1362.3834095890268,
"area_90": 5297.621488572886,
"duration": null,
"pipeline": "gstlal",
"properties": {
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"HasMassGap": 0.012106583072100312,
"HasRemnant": 0.0
},
"instruments": [
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"L1"
],
"significant": false,
"skymap_hash": "4f30859202ca8069502d9c34a8b5b54a",
"classification": {
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"BNS": 9.971886789242403e-14,
"NSBH": 6.883071636074089e-12,
"Terrestrial": 0.9274202158119972
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-08T06:31:00Z",
"superevent_id": "S230808r",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-08T06:31:02.278140Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-08T06:31:02.278172Z",
"modified": "2023-08-08T06:31:02.287055Z"
}
},
{
"id": 1075,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1918,
"topic": "igwn.gwalert",
"uuid": "4b01f91e-c87c-4720-ac79-160f7d5011bf",
"title": "S230808r - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230808r/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230808r/view/"
},
"event": {
"far": 2.125354257192313e-05,
"time": "2023-08-08T06:30:36.690Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1362.3834095890268,
"area_90": 5297.621488572886,
"duration": null,
"pipeline": "gstlal",
"properties": {
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"HasMassGap": 0.012106583072100312,
"HasRemnant": 0.0
},
"instruments": [
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"L1"
],
"significant": false,
"skymap_hash": "4f30859202ca8069502d9c34a8b5b54a",
"classification": {
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"BNS": 9.971886789242403e-14,
"NSBH": 6.883071636074089e-12,
"Terrestrial": 0.9274202158119972
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-08T06:35:35Z",
"superevent_id": "S230808r",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-08T06:35:36.849981Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-08T06:35:36.850002Z",
"modified": "2023-08-08T06:35:36.855567Z"
}
}
],
"references": []
},
{
"event_id": "S230808ae",
"sequences": [
{
"id": 1077,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1929,
"topic": "igwn.gwalert",
"uuid": "03a46280-dbc9-43b4-93af-637e8f22031f",
"title": "S230808ae - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230808ae/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230808ae/view/"
},
"event": {
"far": 1.83831e-05,
"time": "2023-08-08T22:43:15.942Z",
"group": "Burst",
"search": "AllSky",
"area_50": 610.1664800685185,
"area_90": 2437.3087456932285,
"duration": 0.016543,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "d62867cd4b0312049adab746d74101bf",
"classification": {},
"skymap_version": 0,
"central_frequency": 270.664581
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-08T22:46:22Z",
"superevent_id": "S230808ae",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-08T22:46:24.079693Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-08T22:46:24.079729Z",
"modified": "2023-08-08T22:46:24.087470Z"
}
},
{
"id": 1078,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1930,
"topic": "igwn.gwalert",
"uuid": "8a152bbc-1a24-4981-9ee3-c0c17b9ed520",
"title": "S230808ae - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230808ae/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230808ae/view/"
},
"event": {
"far": 1.83831e-05,
"time": "2023-08-08T22:43:15.942Z",
"group": "Burst",
"search": "AllSky",
"area_50": 610.1664800685185,
"area_90": 2437.3087456932285,
"duration": 0.016543,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "d62867cd4b0312049adab746d74101bf",
"classification": {},
"skymap_version": 0,
"central_frequency": 270.664581
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-08T22:50:56Z",
"superevent_id": "S230808ae",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-08T22:50:57.656209Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-08T22:50:57.656231Z",
"modified": "2023-08-08T22:50:57.661856Z"
}
}
],
"references": []
},
{
"event_id": "S230808af",
"sequences": [
{
"id": 1079,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1931,
"topic": "igwn.gwalert",
"uuid": "09d5c81a-d44a-4fdf-bb5f-23b6d53caf23",
"title": "S230808af - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230808af/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230808af/view/"
},
"event": {
"far": 9.207307e-06,
"time": "2023-08-08T22:51:55.992Z",
"group": "CBC",
"search": "AllSky",
"area_50": 468.6930449976109,
"area_90": 1871.6248288209022,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.46241284449547526,
"HasRemnant": 0.9588168348920358
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "05db2f63e182a29fd59106ecbebc03fb",
"classification": {
"BBH": 0.0,
"BNS": 2.363e-05,
"NSBH": 0.001995661,
"Terrestrial": 0.997980709
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-08T22:57:16Z",
"superevent_id": "S230808af",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-08T22:57:18.686938Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-08T22:57:18.686980Z",
"modified": "2023-08-08T22:57:18.696400Z"
}
},
{
"id": 1080,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1932,
"topic": "igwn.gwalert",
"uuid": "078f71a5-ffa3-421e-9797-7c05cfbf1b80",
"title": "S230808af - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230808af/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230808af/view/"
},
"event": {
"far": 9.207307e-06,
"time": "2023-08-08T22:51:55.992Z",
"group": "CBC",
"search": "AllSky",
"area_50": 468.6930449976109,
"area_90": 1871.6248288209022,
"duration": null,
"pipeline": "MBTA",
"properties": {
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"HasMassGap": 0.46241284449547526,
"HasRemnant": 0.9588168348920358
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "05db2f63e182a29fd59106ecbebc03fb",
"classification": {
"BBH": 0.0,
"BNS": 2.363e-05,
"NSBH": 0.001995661,
"Terrestrial": 0.997980709
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-08T23:01:51Z",
"superevent_id": "S230808af",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-08T23:01:53.111568Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-08T23:01:53.111598Z",
"modified": "2023-08-08T23:01:53.120967Z"
}
}
],
"references": []
},
{
"event_id": "S230809b",
"sequences": [
{
"id": 1081,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1933,
"topic": "igwn.gwalert",
"uuid": "65dec48f-fccd-4ba1-9e19-e7b5cac68974",
"title": "S230809b - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230809b/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230809b/view/"
},
"event": {
"far": 1.5957e-05,
"time": "2023-08-09T00:18:31.133Z",
"group": "Burst",
"search": "AllSky",
"area_50": 1266.494110623651,
"area_90": 4377.96547683275,
"duration": 0.008426,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "ce70ba70441922a33611373872f619b4",
"classification": {},
"skymap_version": 0,
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"modified": "2023-08-12T03:50:55.705374Z"
}
}
],
"references": [
{
"id": 1993,
"topic": "gcn.circular",
"uuid": "29598385-9db1-4c62-813f-651fee416432",
"title": "LIGO/Virgo/KAGRA S230811n: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"data": {
"date": "23/08/12 03:39:18 GMT",
"from": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"title": "GCN CIRCULAR",
"number": "34382",
"subject": "LIGO/Virgo/KAGRA S230811n: Updated Sky localization"
},
"message_text": " The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe 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 S230811n (GCN Circular 34380). 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:\n\nhttps://gracedb.ligo.org/superevents/S230811n\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 810 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1905 +/- 672 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\n\nhttps://emfollow.docs.ligo.org/userguide/.\n\n\n [1] Ashton et al. ApJS 241, 27 (2019)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxODExNTY0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.lukcGZLDDPiaAYa6HY6JsT8xmY3al_9rgX2Xv75L28s\n\n",
"published": "2023-08-12T03:39:33.944410Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-12T03:39:33.944426Z",
"modified": "2023-08-12T03:39:33.948031Z",
"targets": []
},
{
"id": 1970,
"topic": "gcn.circular",
"uuid": "4ad85de7-68bd-4ae7-aa0e-a19475865fb9",
"title": "LIGO/Virgo/KAGRA S230811n: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Shivaraj Kandhasamy at Inter-University Centre for Astronomy and Astrophysics (LVK collaboration) <shivaraj@iucaa.in>",
"data": {
"date": "23/08/11 04:07:27 GMT",
"from": "Shivaraj Kandhasamy at Inter-University Centre for Astronomy and Astrophysics (LVK collaboration) <shivaraj@iucaa.in>",
"title": "GCN CIRCULAR",
"number": "34380",
"subject": "LIGO/Virgo/KAGRA S230811n: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S230811n during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-08-11 03:21:16.293 UTC (GPS\ntime: 1375759294.293). The candidate was found by the CWB [1], GstLAL\n[2], MBTA [3], PyCBC Live [4], and SPIIR [5] analysis pipelines.\n\nS230811n is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 3.2e-10 Hz, or about one in 1e2\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230811n\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (>99%), Terrestrial (<1%), BNS (<1%), or NSBH\n(<1%).\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is <1%. [6] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [6] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat either of the binary components lies between 3 and 5 solar masses\n(HasMassgap) is <1%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 30 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 5 minutes after the\ncandidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,2. For\nthe bayestar.multiorder.fits,2 sky map, the 90% credible region is 955\ndeg2. Marginalized over the whole sky, the a posteriori luminosity\ndistance estimate is 2530 +/- 777 Mpc (a posteriori mean +/- standard\ndeviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\nhttps://emfollow.docs.ligo.org/userguide/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n [2] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [3] Aubin et al. CQG 38, 095004 (2021)\n [4] Dal Canton et al. ApJ 923, 254 (2021)\n [5] Chu et al. PRD 105, 024023 (2022)\n [6] Chatterjee et al. ApJ 896, 54 (2020)\n [7] Singer & Price PRD 93, 024013 (2016)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxNzI2ODUzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.T_rQmHN9NM3OqyNannpJfdR7H2_dapVcSQ-Ks5dbaoo\n\n",
"published": "2023-08-11T04:07:41.425935Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-11T04:07:41.425952Z",
"modified": "2023-08-11T04:07:41.430394Z",
"targets": []
}
]
},
{
"event_id": "S230811y",
"sequences": [
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"id": 1114,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1984,
"topic": "igwn.gwalert",
"uuid": "4e0b7fb2-ae56-4310-a7ec-4e421b2d6ac8",
"title": "S230811y - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"event": {
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"time": "2023-08-11T22:46:20.856Z",
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"area_50": 67.14349161689336,
"area_90": 235.00222065912672,
"duration": 0.021805,
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"time_created": "2023-08-11T22:47:38Z",
"superevent_id": "S230811y",
"external_coinc": null
},
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"published": "2023-08-11T22:47:39.130161Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-11T22:47:39.130182Z",
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{
"id": 1116,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1986,
"topic": "igwn.gwalert",
"uuid": "9f43246d-80b4-4921-a108-3c5452cb446d",
"title": "S230811y - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230811y/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230811y/view/"
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"event": {
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"time": "2023-08-11T22:46:20.856Z",
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"sequence_num": 2,
"time_created": "2023-08-11T22:52:12Z",
"superevent_id": "S230811y",
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},
"message_text": "",
"published": "2023-08-11T22:52:13.683009Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-11T22:52:13.683033Z",
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}
}
],
"references": []
},
{
"event_id": "S230811z",
"sequences": [
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"message": {
"id": 1985,
"topic": "igwn.gwalert",
"uuid": "a7349461-8213-43cd-8c76-e402af24d81d",
"title": "S230811z - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230811z/view/"
},
"event": {
"far": 6.40453e-06,
"time": "2023-08-11T22:47:11.157Z",
"group": "Burst",
"search": "AllSky",
"area_50": 188.8410701725126,
"area_90": 835.0971769851112,
"duration": 0.014046,
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"significant": false,
"skymap_hash": "07712df905421726da04da0bd91cb6b2",
"classification": {},
"skymap_version": 0,
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"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-11T22:48:51Z",
"superevent_id": "S230811z",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-11T22:48:52.383762Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-11T22:48:52.383780Z",
"modified": "2023-08-11T22:48:52.389443Z"
}
},
{
"id": 1117,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1987,
"topic": "igwn.gwalert",
"uuid": "340a6783-cb71-496e-a28e-5bab96a56342",
"title": "S230811z - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230811z/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230811z/view/"
},
"event": {
"far": 6.40453e-06,
"time": "2023-08-11T22:47:11.157Z",
"group": "Burst",
"search": "AllSky",
"area_50": 188.8410701725126,
"area_90": 835.0971769851112,
"duration": 0.014046,
"pipeline": "CWB",
"properties": {},
"instruments": [
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],
"significant": false,
"skymap_hash": "07712df905421726da04da0bd91cb6b2",
"classification": {},
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"central_frequency": 318.181305
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-11T22:53:26Z",
"superevent_id": "S230811z",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-11T22:53:26.789330Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-11T22:53:26.789350Z",
"modified": "2023-08-11T22:53:26.795438Z"
}
}
],
"references": []
},
{
"event_id": "S230812b",
"sequences": [
{
"id": 1118,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1988,
"topic": "igwn.gwalert",
"uuid": "59f23b14-6451-4d5f-ae74-9131ed20aaf7",
"title": "S230812b - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230812b/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230812b/view/"
},
"event": {
"far": 4.954024140090928e-06,
"time": "2023-08-12T00:19:04.708Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1226.6276624761206,
"area_90": 5086.958783624883,
"duration": null,
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"HasMassGap": 0.012106583072100312,
"HasRemnant": 0.0
},
"instruments": [
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"skymap_hash": "5565a5a936cd7771b26a60d9aab8e391",
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"BNS": 2.4090402703653007e-15,
"NSBH": 1.7244632569778946e-13,
"Terrestrial": 0.6994322755391638
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-12T00:19:31Z",
"superevent_id": "S230812b",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-12T00:19:33.381924Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-12T00:19:33.381945Z",
"modified": "2023-08-12T00:19:33.387949Z"
}
},
{
"id": 1119,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 1989,
"topic": "igwn.gwalert",
"uuid": "4af53f48-26c1-44d4-a8d8-026930e58c34",
"title": "S230812b - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230812b/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230812b/view/"
},
"event": {
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"time": "2023-08-12T00:19:04.707Z",
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"time_created": "2023-08-12T00:24:07Z",
"superevent_id": "S230812b",
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},
"message_text": "",
"published": "2023-08-12T00:24:08.982230Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-12T00:24:08.982271Z",
"modified": "2023-08-12T00:24:08.990826Z"
}
}
],
"references": []
},
{
"event_id": "S230812e",
"sequences": [
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"sequence_type": "PRELIMINARY",
"message": {
"id": 1990,
"topic": "igwn.gwalert",
"uuid": "a9d20eaa-3458-4fb5-80e7-a35fe02f8f5a",
"title": "S230812e - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"published": "2023-08-12T01:14:30.929002Z",
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"message": {
"id": 1991,
"topic": "igwn.gwalert",
"uuid": "796b56c9-cb4d-41cc-b894-a4866c02fc6e",
"title": "S230812e - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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},
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},
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"published": "2023-08-12T01:19:05.381337Z",
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"retracted": false,
"created": "2023-08-12T01:19:05.381356Z",
"modified": "2023-08-12T01:19:05.387121Z"
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],
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},
{
"event_id": "S230812x",
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"message": {
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"topic": "igwn.gwalert",
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"title": "S230812x - PRELIMINARY",
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"data": {
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"authors": "LVK",
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{
"event_id": "S230812a",
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"references": [
{
"id": 2055,
"topic": "gcn.circular",
"uuid": "61defbfd-1ce9-4f95-abbe-9c2124d11a89",
"title": "LIGO/Virgo/KAGRA S230812aj: two counterpart neutrino candidates from IceCube neutrino searches",
"submitter": "Hop gcn.circular",
"authors": "acz2122@columbia.edu",
"data": {
"date": "23/08/14 00:29:28 GMT",
"from": "acz2122@columbia.edu",
"title": "GCN CIRCULAR",
"number": "34407",
"subject": "LIGO/Virgo/KAGRA S230812aj: two counterpart neutrino candidates from IceCube neutrino searches"
},
"message_text": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nA search for track-like muon neutrino events detected by IceCube consistent with the sky\nlocalization of the low-significance gravitational wave candidate S230812aj in a time range of 1000 seconds\ncentered on the alert event time (2023-08-12 11:56:00 UTC to 2023-08-12 12:12:40 UTC)\nhas been performed [1,2]. During this time period IceCube was collecting good quality data.\nOne hypothesis test was conducted for this low-significance gravitational wave event. The\nsearch uses a Bayesian approach to quantify the joint GW + neutrino event significance, which\nassumes a binary merger scenario and accounts for known astrophysical priors, such as GW source\ndistance, in the significance estimate [3].\n\nTwo track-like events are found in spatial and temporal coincidence with the gravitational-wave\ncandidate S230812aj calculated from the map circulated by LVK as S230812aj-2-Preliminary. This\nrepresents an overall pre-trial p-value of 0.0049 for the Bayesian search.\n\nThe reported p-value here does not account for any trials correction (multiple hypotheses testing). The false alarm rate of these coincidences can be obtained by multiplying the p-values with their corresponding GW trigger rates. Further details are available at https://gcn.nasa.gov/missions/icecube.\n\nProperties of the coincident event(s) are shown below.\n\ndt(s)\tRA(deg)\t\tDec(deg)\tAngular uncertainty(deg) p-value(generic transient) p-value(Bayesian)\n-----------------------------------------------------------------------------------------------------\n141.95 296.38 \t38.28 \t1.987 \t\tnot applicable \t0.0054\n-86.59 304.78 \t8.59 \t1.716 \t\tnot applicable \t0.0846\n\n\nwhere:\ndt = Time of track event minus time of GW trigger (sec)\nAngular uncertainty = Angular uncertainty of track event: the radius of a circle\n \trepresenting 90% CL containment by area.\np-value = the p-value for this specific track event from each search.\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the\ngeographic South Pole, Antarctica. The IceCube realtime alert point of contact can be\nreached at roc@icecube.wisc.edu\n\n[1] M. G. Aartsen et al 2020 ApJL 898 L10\n[2] Abbasi et al. Astrophys.J. 944 (2023) 1, 80\n[3] I. Bartos et al. 2019 Phys. Rev. D 100, 083017\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxOTcyOTc0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.CSk8iS02TV-LDw-dLXzqZ5ebQJE0YJq3RSkrD1IAzJE\n\n",
"published": "2023-08-14T00:29:42.218097Z",
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"retracted": false,
"created": "2023-08-14T00:29:42.218127Z",
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"references": [
{
"id": 2082,
"topic": "gcn.circular",
"uuid": "42538506-902f-41e9-aee5-602bbaba0ad4",
"title": "LIGO/Virgo/KAGRA S230814r: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "charlie.hoy@port.ac.uk",
"data": {
"date": "23/08/14 22:26:38 GMT",
"from": "charlie.hoy@port.ac.uk",
"title": "GCN CIRCULAR",
"number": "34426",
"subject": "LIGO/Virgo/KAGRA S230814r: Updated Sky localization"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe have conducted further offline analysis of the LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S230814r (GCN Circular 34411). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits, distributed via GCN Notice, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S230814r\n\nFor the Bilby.multiorder.fits sky map, the 90% credible region is 3389 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 3788 +/- 1416 Mpc (a posteriori mean +/- standard deviation).\n\nFor 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/userguide/.\n\n\n [1] Ashton et al. ApJS 241, 27 (2019)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDUyMDAzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.ok1lNHQuSTMHdQTZ8WWpgjFz_F1FlbaydYGBnfwqKZE\n\n",
"published": "2023-08-14T22:26:49.558227Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-14T22:26:49.558248Z",
"modified": "2023-08-14T22:26:49.562213Z",
"targets": []
},
{
"id": 2066,
"topic": "gcn.circular",
"uuid": "e0498431-40f9-440c-acc7-ec5c8a00ac7b",
"title": "LIGO/Virgo/KAGRA S230814r: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "U. Deka at International Centre for Theoretical Sciences <uddeepta.deka@ligo.org>",
"data": {
"date": "23/08/14 07:49:50 GMT",
"from": "U. Deka at International Centre for Theoretical Sciences <uddeepta.deka@ligo.org>",
"title": "GCN CIRCULAR",
"number": "34411",
"subject": "LIGO/Virgo/KAGRA S230814r: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S230814r during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-08-14 06:19:20.458 UTC (GPS\ntime: 1376029178.458). The candidate was found by the CWB [1], GstLAL\n[2], oLIB [3], PyCBC Live [4], and SPIIR [5] analysis pipelines.\n\nS230814r is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 4.8e-08 Hz, or about one in 7\nmonths. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230814r\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (93%), Terrestrial (7%), BNS (<1%), or NSBH (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is <1%. [6] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [6] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat either of the binary components lies between 3 and 5 solar masses\n(HasMassGap) is <1%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 26 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 5 minutes after the\ncandidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,2. For\nthe bayestar.multiorder.fits,2 sky map, the 90% credible region is\n3753 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 5634 +/- 2023 Mpc (a posteriori mean\n+/- standard deviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\nhttps://emfollow.docs.ligo.org/userguide/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n [2] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [3] Lynch et al. PRD 95, 104046 (2017)\n [4] Dal Canton et al. ApJ 923, 254 (2021)\n [5] Chu et al. PRD 105, 024023 (2022)\n [6] Chatterjee et al. ApJ 896, 54 (2020)\n [7] Singer & Price PRD 93, 024013 (2016)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkxOTk5Mzk1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.-E3E4rVcMY57Et9tJu5M3HMf_-miA07w6da6p8oiSCQ\n\n",
"published": "2023-08-14T07:50:04.211812Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-14T07:50:04.211832Z",
"modified": "2023-08-14T07:50:04.218279Z",
"targets": []
}
]
},
{
"event_id": "S230814ah",
"sequences": [
{
"id": 1168,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 2084,
"topic": "igwn.gwalert",
"uuid": "deed0935-14cf-40d4-94f0-38c39464112c",
"title": "S230814ah - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230814ah/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230814ah/view/"
},
"event": {
"far": 1.846774159306684e-21,
"time": "2023-08-14T23:09:01.810Z",
"group": "CBC",
"search": "AllSky",
"area_50": 8061.41546225326,
"area_90": 24222.01460079428,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"L1"
],
"significant": true,
"skymap_hash": "bb95f337e6d58171c54c8e09fa4dcd76",
"classification": {
"BBH": 0.9999999999999799,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 2.0095036745715333e-14
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-14T23:09:29Z",
"superevent_id": "S230814ah",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-14T23:09:31.124757Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-14T23:09:31.124778Z",
"modified": "2023-08-14T23:09:31.128592Z"
}
},
{
"id": 1169,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 2085,
"topic": "igwn.gwalert",
"uuid": "060d0fe8-6981-4917-999c-7cb812c437d1",
"title": "S230814ah - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230814ah/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230814ah/view/"
},
"event": {
"far": 1.846774159306684e-21,
"time": "2023-08-14T23:09:01.810Z",
"group": "CBC",
"search": "AllSky",
"area_50": 8061.41546225326,
"area_90": 24222.01460079428,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"L1"
],
"significant": true,
"skymap_hash": "bb95f337e6d58171c54c8e09fa4dcd76",
"classification": {
"BBH": 0.9999999999999799,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 2.0095036745715333e-14
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-14T23:14:08Z",
"superevent_id": "S230814ah",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-14T23:14:08.832994Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-14T23:14:08.833015Z",
"modified": "2023-08-14T23:14:08.836691Z"
}
},
{
"id": 1170,
"sequence_number": 3,
"sequence_type": "INITIAL",
"message": {
"id": 2086,
"topic": "igwn.gwalert",
"uuid": "b169c55f-0ce3-4545-8b21-61600b8d9425",
"title": "S230814ah - INITIAL",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230814ah/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230814ah/view/"
},
"event": {
"far": 1.846774159306684e-21,
"time": "2023-08-14T23:09:01.810Z",
"group": "CBC",
"search": "AllSky",
"area_50": 8061.41546225326,
"area_90": 24222.01460079428,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"L1"
],
"significant": true,
"skymap_hash": "bb95f337e6d58171c54c8e09fa4dcd76",
"classification": {
"BBH": 0.9999999999999799,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 2.0095036745715333e-14
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "INITIAL",
"sequence_num": 3,
"time_created": "2023-08-14T23:59:38Z",
"superevent_id": "S230814ah",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-14T23:59:39.080533Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-14T23:59:39.080554Z",
"modified": "2023-08-14T23:59:39.084723Z"
}
},
{
"id": 1488,
"sequence_number": 4,
"sequence_type": "UPDATE",
"message": {
"id": 2577,
"topic": "igwn.gwalert",
"uuid": "4ab1e4b5-f82c-4da4-be11-ec6c07be46e9",
"title": "S230814ah - UPDATE",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230814ah/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230814ah/view/"
},
"event": {
"far": 1.846774159306684e-21,
"time": "2023-08-14T23:09:01.810Z",
"group": "CBC",
"search": "AllSky",
"area_50": 8688.367815226,
"area_90": 25259.381546275283,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"L1"
],
"significant": true,
"skymap_hash": "ef712ce2c3854a122a70a4934961ff34",
"classification": {
"BBH": 0.9999999999999799,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 2.0095036745715333e-14
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "UPDATE",
"sequence_num": 4,
"time_created": "2023-08-29T21:42:36Z",
"superevent_id": "S230814ah",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-29T21:42:37.022721Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-29T21:42:37.022745Z",
"modified": "2023-08-29T21:42:37.029058Z"
}
}
],
"references": []
},
{
"event_id": "S230814a",
"sequences": [],
"references": [
{
"id": 2578,
"topic": "gcn.circular",
"uuid": "e5a903f7-cbbb-4bf0-b3ae-1978c3e3f755",
"title": "LIGO/Virgo/KAGRA S230814ah: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "Charlie Hoy at University of Portsmouth <charlie.hoy@port.ac.uk>",
"data": {
"date": "23/08/29 21:57:07 GMT",
"from": "Charlie Hoy at University of Portsmouth <charlie.hoy@port.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34595",
"subject": "LIGO/Virgo/KAGRA S230814ah: Updated Sky localization"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe have conducted further analysis of the LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S230814ah (GCN Circular 34429). Parameter estimation has been performed using Bilby [1] and a new sky\nmap, Bilby.offline0.multiorder.fits, distributed via GCN Notice, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S230814ah\n\nFor the Bilby.offline0.multiorder.fits sky map, the 90% credible region is 25260 deg2. Marginalized over the whole sky, the a\nposteriori luminosity distance estimate is 330 +/- 105 Mpc (a posteriori mean +/- standard deviation).\n\nFor 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/userguide/.\n\n\n [1] Ashton et al. ApJS 241, 27 (2019)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMzQ2MjMyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.cPse_-KQG_N_IJHNcsg8faa0wUhs3w53yFSGJPP0P7c\n\n",
"published": "2023-08-29T21:57:19.980629Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-29T21:57:19.980645Z",
"modified": "2023-08-29T21:57:19.984731Z",
"targets": []
},
{
"id": 2088,
"topic": "gcn.circular",
"uuid": "1853d6cf-72bd-4abd-9a91-26c9da31ea94",
"title": "LIGO/Virgo/KAGRA S230814ah: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "ìµìì° <choisy4044@gmail.com>",
"data": {
"date": "23/08/15 00:04:16 GMT",
"from": "ìµìì° <choisy4044@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34429",
"subject": "LIGO/Virgo/KAGRA S230814ah: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the\nKAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S230814ah during\nreal-time processing of data from LIGO Livingston Observatory (L1) at\n2023-08-14 23:09:01.810 UTC (GPS time: 1376089759.810). The candidate\nwas found by the GstLAL [1] analysis pipeline.\n\nS230814ah is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 1.8e-21 Hz, or about one in 1e13\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230814ah\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (>99%), Terrestrial (<1%), BNS (<1%), or NSBH\n(<1%).\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is <1%. [2] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [2] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat either of the binary components lies between 3 and 5 solar masses\n(HasMassgap) is <1%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [3], distributed via GCN notice about 27 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by\nBAYESTAR [3], distributed via GCN notice about 5 minutes after the\ncandidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,2. For\nthe bayestar.multiorder.fits,2 sky map, the 90% credible region is\n24222 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 405 +/- 124 Mpc (a posteriori mean +/-\nstandard deviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\nhttps://emfollow.docs.ligo.org/userguide/.\n\n [1] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [2] Chatterjee et al. ApJ 896, 54 (2020)\n [3] Singer & Price PRD 93, 024013 (2016)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDU3ODU4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.vmSG-D3bO6khXVeZw6j0uWzVKMdSCVzl2zb7z4KA6Q8\n\n",
"published": "2023-08-15T00:04:22.832731Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-15T00:04:22.832752Z",
"modified": "2023-08-15T00:04:22.837590Z",
"targets": []
}
]
},
{
"event_id": "S230815g",
"sequences": [
{
"id": 1171,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 2090,
"topic": "igwn.gwalert",
"uuid": "536840e3-934d-4bc4-814d-463b0bea2b50",
"title": "S230815g - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230815g/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230815g/view/"
},
"event": {
"far": 6.416614374983498e-06,
"time": "2023-08-15T05:45:52.728Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1166.827990254825,
"area_90": 6569.990654713015,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.04264138160689884,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "a7cbf019cf17ebe996047905a1fa9001",
"classification": {
"BBH": 0.2315667722666192,
"BNS": 1.154862903620145e-14,
"NSBH": 8.751158230786111e-13,
"Terrestrial": 0.7684332277324941
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-15T05:46:17Z",
"superevent_id": "S230815g",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-15T05:46:18.277994Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-15T05:46:18.278023Z",
"modified": "2023-08-15T05:46:18.284031Z"
}
},
{
"id": 1172,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 2091,
"topic": "igwn.gwalert",
"uuid": "d6b2d051-cad3-45c6-9223-83cc24a88066",
"title": "S230815g - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230815g/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230815g/view/"
},
"event": {
"far": 6.416614374983498e-06,
"time": "2023-08-15T05:45:52.728Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1166.827990254825,
"area_90": 6569.990654713015,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.04264138160689884,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "a7cbf019cf17ebe996047905a1fa9001",
"classification": {
"BBH": 0.2315667722666192,
"BNS": 1.154862903620145e-14,
"NSBH": 8.751158230786111e-13,
"Terrestrial": 0.7684332277324941
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-15T05:50:53Z",
"superevent_id": "S230815g",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-15T05:50:54.337125Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-15T05:50:54.337148Z",
"modified": "2023-08-15T05:50:54.340840Z"
}
}
],
"references": []
},
{
"event_id": "S230815n",
"sequences": [
{
"id": 1173,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 2093,
"topic": "igwn.gwalert",
"uuid": "f6d4bf69-7dcd-4562-a153-5eecd9c59b23",
"title": "S230815n - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230815n/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230815n/view/"
},
"event": {
"far": 1.93799e-05,
"time": "2023-08-15T08:37:03.359Z",
"group": "Burst",
"search": "AllSky",
"area_50": 488.4689015128991,
"area_90": 1494.15251188718,
"duration": 0.013647,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
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