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{
"id": 497,
"topic": "gcn.circular",
"uuid": "a9dbb5cb-470a-487d-9115-ccd0691cc9b1",
"title": "LIGO/Virgo S230622e: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/06/22 14:30:26 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34064",
"subject": "LIGO/Virgo S230622e: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the LIGO/Virgo S230622e errorbox 289 sec after trigger time at 2023-06-22 00:23:51 UT, with upper limit up to 17.0 mag. Observations started at twilight. The observations began at zenith distance = 60 deg. The sun altitude is -10.3 deg.\n\nMASTER-SAAO robotic telescope located in South Africa (South African Astronomical Observatory) started inspect of the LIGO/Virgo S230622e errorbox 979 sec after trigger time at 2023-06-22 00:35:21 UT, with upper limit up to 20.1 mag. The observations began at zenith distance = 61 deg. The sun altitude is -63.3 deg.\n\nThe galactic latitude b = -76 deg., longitude l = 92 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0012220\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 380 | 2023-06-22 00:23:51 | MASTER-Kislovodsk | (14h 52m 07.65s , +52d 51m 51.6s) | C | 180 | 17.0 |\n 1069 | 2023-06-22 00:35:21 | MASTER-SAAO | (00h 17m 30.82s , -15d 25m 31.9s) | C | 180 | 19.3 |\n 1249 | 2023-06-22 00:35:21 | MASTER-SAAO | (00h 17m 30.78s , -15d 25m 31.9s) | C | 540 | 20.1 | Coadd\n 1069 | 2023-06-22 00:35:21 | MASTER-SAAO | (00h 16m 42.49s , -15d 25m 31.0s) | C | 180 | 19.4 |\n 1249 | 2023-06-22 00:35:21 | MASTER-SAAO | (00h 16m 42.47s , -15d 25m 31.0s) | C | 540 | 20.1 | Coadd\n 1281 | 2023-06-22 00:38:53 | MASTER-SAAO | (00h 17m 30.50s , -15d 24m 29.7s) | C | 180 | 19.5 |\n 1281 | 2023-06-22 00:38:53 | MASTER-SAAO | (00h 16m 42.03s , -15d 24m 30.8s) | C | 180 | 19.5 |\n 1493 | 2023-06-22 00:42:24 | MASTER-SAAO | (00h 17m 36.10s , -15d 25m 30.2s) | C | 180 | 19.5 |\n 1493 | 2023-06-22 00:42:24 | MASTER-SAAO | (00h 16m 47.55s , -15d 25m 31.0s) | C | 180 | 19.5 |\n 1703 | 2023-06-22 00:45:55 | MASTER-SAAO | (00h 17m 30.79s , -15d 26m 31.6s) | C | 180 | 19.5 |\n 1703 | 2023-06-22 00:45:55 | MASTER-SAAO | (00h 16m 42.21s , -15d 26m 32.4s) | C | 180 | 19.4 |\n 8058 | 2023-06-22 02:31:50 | MASTER-SAAO | (04h 06m 16.71s , -38d 51m 26.1s) | C | 180 | 19.1 |\n 8058 | 2023-06-22 02:31:50 | MASTER-SAAO | (04h 07m 19.45s , -38d 53m 21.6s) | C | 180 | 18.7 |\n 8269 | 2023-06-22 02:35:21 | MASTER-SAAO | (04h 16m 26.57s , -38d 52m 02.1s) | C | 180 | 19.4 |\n 8269 | 2023-06-22 02:35:21 | MASTER-SAAO | (04h 17m 29.19s , -38d 53m 57.2s) | C | 180 | 18.9 |\n 12853 | 2023-06-22 03:51:44 | MASTER- | (07h 37m 23.10s , +40d 31m 11.9s) | C | 180 | 15.2 |\n 13536 | 2023-06-22 04:03:08 | MASTER- | (07h 47m 52.81s , +40d 31m 38.9s) | C | 180 | 14.1 |\n 19931 | 2023-06-22 05:49:43 | MASTER- | (10h 21m 08.12s , +38d 38m 12.6s) | C | 180 | 15.5 |\n 20270 | 2023-06-22 05:55:22 | MASTER- | (10h 31m 22.78s , +38d 40m 05.7s) | C | 180 | 16.7 |\n 20816 | 2023-06-22 06:04:27 | MASTER- | (10h 21m 03.64s , +38d 38m 25.1s) | C | 180 | 16.7 |\n 21354 | 2023-06-22 06:13:26 | MASTER- | (10h 31m 29.40s , +38d 38m 29.7s) | C | 180 | 17.3 |\n 35196 | 2023-06-22 10:05:02 | MASTER- | (14h 56m 22.83s , +74d 49m 53.9s) | C | 70 | 18.5 |\n 35296 | 2023-06-22 10:06:32 | MASTER- | (14h 56m 20.99s , +74d 51m 13.4s) | C | 90 | 18.4 |\n 35416 | 2023-06-22 10:08:22 | MASTER- | (14h 56m 22.55s , +74d 49m 48.6s) | C | 110 | 18.6 |\n 38702 | 2023-06-22 11:02:33 | MASTER- | (00h 44m 07.17s , +41d 56m 55.9s) | C | 180 | 17.4 |\n 38902 | 2023-06-22 11:05:54 | MASTER- | (00h 44m 11.99s , +41d 55m 28.7s) | C | 180 | 16.5 |\n 39103 | 2023-06-22 11:09:14 | MASTER- | (00h 44m 05.10s , +41d 54m 24.6s) | C | 180 | 15.9 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg3NDQ0MjI4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.viyx46QuYFbQxKnqjYPXdML1M-ApQ2_DKqcnwGwhfTY\n\n",
"published": "2023-06-22T14:30:31.072118Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-22T14:30:31.072138Z",
"modified": "2023-06-22T14:30:31.077214Z",
"targets": []
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"Terrestrial": 0.9973859545236213
},
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},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-06-22T06:19:28Z",
"superevent_id": "S230622u",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-22T06:19:30.622010Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-22T06:19:30.622034Z",
"modified": "2023-06-22T06:19:30.626911Z"
}
}
],
"references": []
},
{
"event_id": "S230622ah",
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{
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"message": {
"id": 489,
"topic": "igwn.gwalert",
"uuid": "e329748d-1eb6-43f7-9f00-428ded079d4e",
"title": "S230622ah - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"time": "2023-06-22T08:58:25.237Z",
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"published": "2023-06-22T08:58:58.669471Z",
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"created": "2023-06-22T08:58:58.669512Z",
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"topic": "igwn.gwalert",
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"title": "S230622ah - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"created": "2023-06-22T09:03:32.917913Z",
"modified": "2023-06-22T09:03:32.922837Z"
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}
],
"references": []
},
{
"event_id": "S230621a",
"sequences": [],
"references": [
{
"id": 495,
"topic": "gcn.circular",
"uuid": "ccb9b37d-c12e-44be-885c-aed30a5178ec",
"title": "LIGO/Virgo S230621ad: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/06/22 14:30:10 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34062",
"subject": "LIGO/Virgo S230621ad: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the LIGO/Virgo S230621ad errorbox 37288 sec after notice time and 37379 sec after trigger time at 2023-06-21 16:45:21 UT, with upper limit up to 18.9 mag. Observations started at twilight. The observations began at zenith distance = 57 deg. The sun altitude is -13.2 deg.\n\nMASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the LIGO/Virgo S230621ad errorbox 63414 sec after notice time and 63506 sec after trigger time at 2023-06-22 00:00:48 UT, with upper limit up to 17.4 mag. Observations started at twilight. The observations began at zenith distance = 62 deg. The sun altitude is -13.1 deg.\n\nThe galactic latitude b = 56 deg., longitude l = 251 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0012206\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 37470 | 2023-06-21 16:45:21 | MASTER-SAAO | (07h 48m 40.71s , -21d 29m 01.2s) | C | 180 | 18.1 |\n 37470 | 2023-06-21 16:45:21 | MASTER-SAAO | (07h 49m 28.38s , -21d 29m 16.1s) | C | 180 | 18.1 |\n 38312 | 2023-06-21 16:59:24 | MASTER-SAAO | (07h 48m 34.31s , -21d 27m 00.7s) | C | 180 | 18.5 |\n 38312 | 2023-06-21 16:59:24 | MASTER-SAAO | (07h 49m 21.60s , -21d 27m 18.9s) | C | 180 | 18.6 |\n 40475 | 2023-06-21 17:35:26 | MASTER-SAAO | (10h 09m 35.73s , -51d 51m 41.6s) | C | 180 | 18.4 |\n 40475 | 2023-06-21 17:35:26 | MASTER-SAAO | (10h 10m 49.05s , -51d 51m 28.7s) | C | 180 | 18.2 |\n 40686 | 2023-06-21 17:38:57 | MASTER-SAAO | (10h 22m 31.22s , -51d 53m 37.7s) | C | 180 | 18.4 |\n 40686 | 2023-06-21 17:38:57 | MASTER-SAAO | (10h 23m 44.70s , -51d 53m 21.8s) | C | 180 | 18.3 |\n 40898 | 2023-06-21 17:42:29 | MASTER-SAAO | (08h 39m 39.51s , -38d 33m 01.8s) | C | 180 | 18.8 |\n 40898 | 2023-06-21 17:42:29 | MASTER-SAAO | (08h 40m 36.56s , -38d 33m 43.0s) | C | 180 | 18.8 |\n 41109 | 2023-06-21 17:46:00 | MASTER-SAAO | (08h 49m 53.97s , -38d 31m 56.2s) | C | 180 | 18.9 |\n 41109 | 2023-06-21 17:46:00 | MASTER-SAAO | (08h 50m 51.17s , -38d 32m 37.7s) | C | 180 | 18.8 |\n 41320 | 2023-06-21 17:49:31 | MASTER-SAAO | (10h 09m 41.45s , -51d 51m 59.9s) | C | 180 | 18.5 |\n 41320 | 2023-06-21 17:49:31 | MASTER-SAAO | (10h 10m 54.91s , -51d 51m 57.2s) | C | 180 | 18.3 |\n 41531 | 2023-06-21 17:53:03 | MASTER-SAAO | (10h 22m 31.57s , -51d 53m 09.9s) | C | 180 | 18.5 |\n 41531 | 2023-06-21 17:53:03 | MASTER-SAAO | (10h 23m 45.10s , -51d 53m 02.7s) | C | 180 | 18.4 |\n 63586 | 2023-06-22 00:00:48 | MASTER-Kislovodsk | (02h 45m 42.84s , +41d 55m 00.9s) | C | 160 | 17.0 |\n 63777 | 2023-06-22 00:03:48 | MASTER-Kislovodsk | (02h 45m 43.00s , +41d 53m 31.6s) | C | 180 | 17.4 |\n 63977 | 2023-06-22 00:07:09 | MASTER-Kislovodsk | (02h 45m 45.48s , +41d 55m 03.9s) | C | 180 | 16.7 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg3NDQ0MjEzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9._fK43p8I8_jvHPBgCCn_lTG9I8khCp-CrHnRYzSRcks\n\n",
"published": "2023-06-22T14:30:17.995241Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-22T14:30:17.995260Z",
"modified": "2023-06-22T14:30:18.000205Z",
"targets": []
}
]
},
{
"event_id": "S230621b",
"sequences": [],
"references": [
{
"id": 496,
"topic": "gcn.circular",
"uuid": "ca821be3-c06c-490a-a5ce-31c6b8ea81b8",
"title": "LIGO/Virgo S230621bq: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/06/22 14:30:16 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34063",
"subject": "LIGO/Virgo S230621bq: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the LIGO/Virgo S230621bq errorbox 15 sec after notice time and 785 sec after trigger time at 2023-06-22 00:00:48 UT, with upper limit up to 17.4 mag. Observations started at twilight. The observations began at zenith distance = 62 deg. The sun altitude is -13.1 deg.\n\nThe galactic latitude b = -16 deg., longitude l = 144 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0012218\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 865 | 2023-06-22 00:00:48 | MASTER-Kislovodsk | (02h 45m 42.84s , +41d 55m 00.9s) | C | 160 | 17.0 |\n 1056 | 2023-06-22 00:03:48 | MASTER-Kislovodsk | (02h 45m 43.00s , +41d 53m 31.6s) | C | 180 | 17.4 |\n 1256 | 2023-06-22 00:07:09 | MASTER-Kislovodsk | (02h 45m 45.48s , +41d 55m 03.9s) | C | 180 | 16.7 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg3NDQ0MjIyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.6e9LuQQTfrr-dFzjGQAYGnGoW0ulG_X8cGkZtSuEUlQ\n\n",
"published": "2023-06-22T14:30:27.038054Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-22T14:30:27.038074Z",
"modified": "2023-06-22T14:30:27.042956Z",
"targets": []
}
]
},
{
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"message": {
"id": 498,
"topic": "igwn.gwalert",
"uuid": "49ad4185-9304-4c3e-8c93-f381ede5ce82",
"title": "S230622ba - PRELIMINARY",
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"data": {
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"area_90": 963.2992812911169,
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"time_created": "2023-06-22T14:36:03Z",
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"external_coinc": null
},
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"published": "2023-06-22T14:36:04.794430Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-22T14:36:04.794466Z",
"modified": "2023-06-22T14:36:04.799997Z"
}
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{
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"id": 499,
"topic": "igwn.gwalert",
"uuid": "c1be56cd-7524-4ad3-8e60-3cdf97598360",
"title": "S230622ba - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"sequence_num": 2,
"time_created": "2023-06-22T14:40:39Z",
"superevent_id": "S230622ba",
"external_coinc": null
},
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"published": "2023-06-22T14:40:40.354435Z",
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"retracted": false,
"created": "2023-06-22T14:40:40.354457Z",
"modified": "2023-06-22T14:40:40.359291Z"
}
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{
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"sequence_type": "RETRACTION",
"message": {
"id": 501,
"topic": "igwn.gwalert",
"uuid": "4ead0ad6-5a1c-498a-ab83-b296857cf586",
"title": "S230622ba - RETRACTION",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"gracedb": "https://gracedb.ligo.org/superevents/S230622ba/view/"
},
"event": null,
"alert_type": "RETRACTION",
"sequence_num": 3,
"time_created": "2023-06-22T15:05:44Z",
"superevent_id": "S230622ba",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-22T15:05:45.478496Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-22T15:05:45.478519Z",
"modified": "2023-06-22T15:05:45.483548Z"
}
}
],
"references": []
},
{
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{
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"message": {
"id": 500,
"topic": "igwn.gwalert",
"uuid": "6d3559cc-6efc-4711-ac83-cbf12bdd3fa8",
"title": "S230622bb - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230622bb/view/"
},
"event": {
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"time": "2023-06-22T14:44:21.521Z",
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"duration": null,
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"Terrestrial": 0.831650974
},
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"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-06-22T14:49:50Z",
"superevent_id": "S230622bb",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-22T14:49:52.561466Z",
"message_parser": "IGWN Alert Avro Parser v1",
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"uuid": "5bc18a7c-72b7-4ba4-a7af-80602727b0aa",
"title": "LIGO/Virgo/KAGRA S230624av: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "Geraint Pratten at University of Birmingham/LIGO <geraint.pratten@ligo.org>",
"data": {
"date": "23/06/26 17:43:17 GMT",
"from": "Geraint Pratten at University of Birmingham/LIGO <geraint.pratten@ligo.org>",
"title": "GCN CIRCULAR",
"number": "34083",
"subject": "LIGO/Virgo/KAGRA S230624av: 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 S230624av (GCN Circular 34075). 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/S230624av\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 1024 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 2124 +/- 682 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg3ODAxNDAyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Qto7bw6Qxb7lSZTA3ArwcIuBwDeUnSSdnQicmy9IaxU\n\n",
"published": "2023-06-26T17:43:28.384602Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-26T17:43:28.384623Z",
"modified": "2023-06-26T17:43:28.391802Z",
"targets": []
},
{
"id": 557,
"topic": "gcn.circular",
"uuid": "70e6b636-1130-4310-ac39-30dab1a1b27b",
"title": "LIGO/Virgo/KAGRA S230624av: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "miquel.miravet@uv.es",
"data": {
"date": "23/06/24 12:01:04 GMT",
"from": "miquel.miravet@uv.es",
"title": "GCN CIRCULAR",
"number": "34075",
"subject": "LIGO/Virgo/KAGRA S230624av: 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 S230624av during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-06-24 11:31:03.770 UTC (GPS\ntime: 1371641481.770). The candidate was found by the CWB [1], MBTA\n[2], GstLAL [3], and SPIIR [4] analysis pipelines.\n\nS230624av is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 1.3e-08 Hz, or about one in 2\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230624av\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (95%), Terrestrial (5%), 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%. [5] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [5] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat any one of the binary components lie between 3 to 5 solar mass\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 [6], distributed via GCN notice about 31 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [6], 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\n1718 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 2556 +/- 787 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\n<https://emfollow.docs.ligo.org/userguide/>.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n [2] Aubin et al. CQG 38, 095004 (2021)\n [3] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [4] Chu et al. PRD 105, 024023 (2022)\n [5] Chatterjee et al. ApJ 896, 54 (2020)\n [6] Singer & Price PRD 93, 024013 (2016)\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg3NjA4MDcwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.FTwg8nBIL9Os1ch5-JlaNx6nops2-iSK3ApyeiSynyI\n\n",
"published": "2023-06-24T12:01:18.382227Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-24T12:01:18.382247Z",
"modified": "2023-06-24T12:01:18.387792Z",
"targets": []
}
]
},
{
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"message": {
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"topic": "igwn.gwalert",
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"title": "S230624e - PRELIMINARY",
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"authors": "LVK",
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"published": "2023-06-24T02:07:18.342895Z",
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"message": {
"id": 547,
"topic": "igwn.gwalert",
"uuid": "3092101b-2ec2-4913-8354-9d28517475ff",
"title": "S230624e - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"time_created": "2023-06-24T02:11:51Z",
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"published": "2023-06-24T02:11:52.027478Z",
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"retracted": false,
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"title": "S230624j - PRELIMINARY",
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"data": {
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},
"event": {
"far": 2.12115e-05,
"time": "2023-06-24T03:29:58.609Z",
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"sequence_num": 1,
"time_created": "2023-06-24T03:32:55Z",
"superevent_id": "S230624j",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-24T03:32:56.362487Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-24T03:32:56.362512Z",
"modified": "2023-06-24T03:32:56.369156Z"
}
},
{
"id": 233,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 549,
"topic": "igwn.gwalert",
"uuid": "6b3a03f1-b30f-4a7f-b1dd-534319be2d8c",
"title": "S230624j - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"time": "2023-06-24T03:29:58.609Z",
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"time_created": "2023-06-24T03:37:29Z",
"superevent_id": "S230624j",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-24T03:37:29.962592Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-24T03:37:29.962616Z",
"modified": "2023-06-24T03:37:29.967750Z"
}
}
],
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},
{
"event_id": "S230624s",
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"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 550,
"topic": "igwn.gwalert",
"uuid": "e5a8f6d8-8af8-48ef-938b-1da9c0195e25",
"title": "S230624s - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
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"data": {
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"time_created": "2023-06-24T04:53:13Z",
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"published": "2023-06-24T04:53:14.804323Z",
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"created": "2023-06-24T04:53:14.804350Z",
"modified": "2023-06-24T04:53:14.811655Z"
}
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"message": {
"id": 551,
"topic": "igwn.gwalert",
"uuid": "27069732-f4ba-4b2e-a287-405e37169e34",
"title": "S230624s - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"time_created": "2023-06-24T04:57:53Z",
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},
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"published": "2023-06-24T04:57:54.839613Z",
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"created": "2023-06-24T04:57:54.839641Z",
"modified": "2023-06-24T04:57:54.846886Z"
}
}
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"references": []
},
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"message": {
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"topic": "igwn.gwalert",
"uuid": "c4161c36-8c18-41e6-b4d2-373ea282b349",
"title": "S230624ae - PRELIMINARY",
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"data": {
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"topic": "igwn.gwalert",
"uuid": "0d77f730-03c3-44a2-9b54-9f38a3f6843f",
"title": "S230624ae - PRELIMINARY",
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"data": {
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"time_created": "2023-06-24T07:34:02Z",
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"published": "2023-06-24T07:34:03.596940Z",
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"created": "2023-06-24T07:34:03.596967Z",
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}
],
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},
{
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{
"id": 925,
"topic": "gcn.circular",
"uuid": "100ce8a4-103d-4ea8-b7e7-fde380434006",
"title": "LIGO/Virgo/KAGRA S230627c: GECKO optical follow-up observations of host galaxy candidates and ZTF23aaptsuy/AT2023lxu",
"submitter": "Hop gcn.circular",
"authors": "Gregory Paek at Seoul National University <gregorypaek94@gmail.com>",
"data": {
"date": "23/07/06 00:01:29 GMT",
"from": "Gregory Paek at Seoul National University <gregorypaek94@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34146",
"subject": "LIGO/Virgo/KAGRA S230627c: GECKO optical follow-up observations of host galaxy candidates and ZTF23aaptsuy/AT2023lxu"
},
"message_text": "Gregory S.-H. Paek, Myungshin Im, Jinguk Seo, Hyeonho Choi, Hongjae Moon (SNUARC/SNU), Joh-Na Yoon (CBNU), Sumin Lee, Changgon Kim, Soojong Pak (KHU), and Hyun-Il Sung (KASI), on behalf of the GECKO Team\n\n We report optical follow-up observations associated with the LIGO/Virgo/KAGRA gravitational-wave event, S230627c (GCN 34086), conducted with the LOAO, KHAO, CBNUO, and SAO telescopes. The LOAO is a 1.0-meter telescope located in the USA. The KHAO and SAO are 1.0-meter and 0.8-meter telescopes, respectively, located in Korea. The CBNUO is a 0.6-meter telescope with a wide field of view, also located in Korea. Detailed information is in Im+21. The LOAO and KHAO observed the seven highest-scoring host galaxy candidates. The SAO observed one of the optical counterpart candidates, ZTF23aaptsuy/AT2023lxu, reported by ZTF (GCN 34089), and the CBNUO observed the highest-ranked tile with a wide field-of-view (~1.4 deg2).\n\n The host galaxy candidates from the GLADE+ catalog (Dálya+21) were ranked based on a calculated score that combines the probability in the GW localization area with the K-band luminosity, the latter of which is used as a proxy for stellar mass. Each tile for wide field-of-view instruments is ranked by summing the scores of galaxies within the tile.\n\n Observations began at 2023-06-27 04:25 (UT), approximately 0.11 days after the GW alert. For the LOAO images, we subtracted each observed image from the reference image in the r-band from the Pan-STARRS1 surveys (Chambers+16) and filtered transient candidates, which we classified either through parameters from SourceEXtractor (Bertin+96) or visual inspection. Despite our efforts, we could not find any significant signals.\n\n We used the Pan-STARRS1 catalog for flux calibration and employed an AB magnitude system. The preliminary 5 sigma depths of LOAO and KHAO images are as follows:\n------\nOBS OBJECT RANK RA DEC DATE-OBS[UTC] t-t0[days] FILTER EXPTIME[s] DEPTH\nLOAO G135600 0 10:44:53.7 +51:59:22.2 2023-06-27T04:25:33 0.11 R 4860 20.9 \nLOAO G1053369 1 10:48:32.0 +54:05:12.0 2023-06-28T04:12:01 1.10 R 1800 20.8 \nLOAO G1047395 2 10:41:23.0 +46:56:05.0 2023-06-28T04:47:23 1.12 R 1800 20.5 \nLOAO G1079423 3 10:49:12.0 +57:50:13.2 2023-06-29T04:00:59 2.09 R 1800 20.8 \nLOAO G1078790 4 10:51:27.1 +57:42:36.0 2023-06-29T04:46:02 2.12 R 1800 20.7 \nLOAO G1047181 5 10:36:31.9 +45:16:44.4 2023-06-30T03:57:02 3.09 R 1800 20.7\nLOAO G1079513 6 10:51:47.2 +55:23:09.6 2023-06-30T04:34:44 3.11 R 1800 20.7\nKHAO G135600 0 10:44:53.1 +51:59:09.8 2023-06-27T12:10:16 0.43 R 900 16.7\n\n The preliminary 5-sigma depth of the CBNUO image is as follows:\n------\nOBS OBJECT RANK RA DEC DATE-OBS[UTC] t-t0[days] FILTER EXPTIME[s] DEPTH\nCBNUO S230627C 0 11:10:14.110 +75:41:28.640 2023-06-27T12:21:49 0.44 R 300 17.1\n\n The preliminary 5 sigma depths of SAO images are as follows:\n------\nOBS OBJECT DATE-OBS[UTC] t-t0[days] FILTER EXPTIME[s] DEPTH\nSAO AT2023lxu 2023-06-27T12:32:39 0.44 R 120 16.6\nSAO AT2023lxu 2023-07-01T11:45:01 4.41 R 2520 19.7\n\n Gravitational-wave EM Counterpart Korean Observatory (GECKO) is a network of 10+ 0.5m to 1m class telescopes worldwide. The Korea Astronomy and Space Science Institute operates LOAO. We thank the LOAO, KHAO, CBNUO, and SAO operators for their support for the observations.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg4NjAxNjk0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.kt-MVP_ziUTtc0K84PUs1btNNXJOMEpu8tFap2sbSFo\n\n",
"published": "2023-07-06T00:01:39.145136Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-06T00:01:39.145172Z",
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},
{
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"title": "LIGO/Virgo/KAGRA S230627c: observations of ZTF23aaptsuy/AT2023lx in AbAO observatory",
"submitter": "Hop gcn.circular",
"authors": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"data": {
"date": "23/07/02 23:54:19 GMT",
"from": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"title": "GCN CIRCULAR",
"number": "34137",
"subject": "LIGO/Virgo/KAGRA S230627c: observations of ZTF23aaptsuy/AT2023lx in AbAO observatory"
},
"message_text": "We observed the ZTF23aaptsuy/AT2023lxu transient (Anumarlapudi et. al, GCN 34089), found in the localization region of LVK S230627c (LVK collaboration, GCN 34086), using the AS-32 telescope on 2023-06-27 (UT) 17:45:15 and 2023-07-01 (UT) 17:56:01. Since we cannot discriminate the source of ZTF23aaptsuy/AT2023lxu from the host galaxy due to FWHM of about 3.7\" we performed (1) aperture photometry of the host galaxy and (2) subtraction of stacked images of the two epochs. (1) Preliminary photometry of the host galaxy (+ ZTF23aaptsuy/AT2023lxu source) is following:\n\nDate UT start t-T0,d Exp. Filter galaxy Err. UL(3sigma)\n (mid exposure) (s)\n\n2023-06-27 17:45:15 0.675440 42*60 R 17.9 0.2 21.0\n2023-07-01 17:56:01 4.690903 65*60 R 17.8 0.1 21.2\n\nThe photometry is based on nearby USNO-B1.0 R2 stars:\nRA Dec R2\n160.2330 41.9734 17.95\n160.2882 42.0158 18.94\n\n(2) Image subtraction did not reveal a point like source with an upper limit of 20.4 magnitudes, assuming no source at one epoch.\n\nThe results above (1,2) confirm a flat LC of the source (Ahumada et al, GCN 34100) and may exclude ZTF23aaptsuy/AT2023lxu from candidates of optical counterpart of LVK S230627c as evidenced by ATLAS (Fulton et al., GCN 34096).\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg4MzQyMDY0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.z-cmPLhme01-uz6h5rmt98SHWpPirgB7LC2y6p-RMK4\n\n",
"published": "2023-07-02T23:54:29.499005Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-02T23:54:29.499038Z",
"modified": "2023-07-02T23:54:29.508058Z",
"targets": []
},
{
"id": 806,
"topic": "gcn.circular",
"uuid": "a0fc858c-e001-44fc-b1ff-8224ba678c4d",
"title": "LIGO/Virgo/KAGRA S230627c: GRANDMA observations of galaxies and ZTF counterpart candidates",
"submitter": "Hop gcn.circular",
"authors": "Mathieu Lamoureux at UCLouvain <mathieu.lamoureux@uclouvain.be>",
"data": {
"date": "23/07/01 21:43:47 GMT",
"from": "Mathieu Lamoureux at UCLouvain <mathieu.lamoureux@uclouvain.be>",
"title": "GCN CIRCULAR",
"number": "34130",
"subject": "LIGO/Virgo/KAGRA S230627c: GRANDMA observations of galaxies and ZTF counterpart candidates"
},
"message_text": "M. Lamoureux (UCLouvain), J.-G. Ducoin (IAP), Y.Tillayev (UBAI/NUUz), P. Hello (IJCLAB), R. Inasaridze, R. Natsvlishvili, N. Kochiashvili, S. Beradze, V. Aivazyan (AbAO), O. Burkhonov, Y. Rajabov (UBAI), S. Ehgamberdiev, T. Sadibekova (UBAI/CEA), R. Hainic, F. Rünger (UnP), I. Tosta e Melo (DFA/UNICT), L. Almeida, L. Fraga, W. Corradi, N. Sasaki (LNA), F. Navarete (NOIRLab/SOAR), F. Wang (THU/BJP), J. Zhu (BJP), L. Wang, X. Zeng, A. Iskandar (XAO), S. Antier, S. Gervasoni, S. Pormente (OCA), M. Coughlin (UMN), S. Karpov, A. Klotz (IRAP), T. Pradier (Univ. Stras.), D. Turpin (CEA), N. Leroy (IJCLAB), M. Masek (FZU), E. Gurbanov (ShAO) report on behalf of the GRANDMA collaboration:\n\n\nWe performed galaxy-targeted observations of the LIGO/Virgo S190627c event (GCN #34086) Abastumani-T70 telescope, UBAI-AZT-22, UBAI-NT60, UBAI-ST60, OST-CDK, NOWT, and OPD-60cm telescopes.\n\nThe target galaxies were selected from the list of potential host galaxies from the MANGROVE catalog [1] in the 90% credible area of the localization region of the LIGO/Virgo GW event (Bilby.multiorder.fits GCN #34087). Note that these galaxies are compatible within 3 sigma of the distance given by the GW event.\n\nA subset of the galaxies we observed is shown in the tables below. We report the center of each image. The field of view of each telescope is given in [2]. T-T0 is the time delay between the observation times and the GW trigger time. We did not detect any significant candidates and we report the upper limits of our images.\n\n\nRA,Dec | Obser. | T-T0 (day)| Filter | Upp.Lim. (AB)\n________________________________________________________________________\n163.134,60.1863 | Abastumani-T70 | 0.69 | R | 20.6 (3sig) \n162.6538,60.953 | Abastumani-T70 | 0.71 | R | 20.2 (3sig)\n162.787,60.9992 | UBAI-AZT-22 | 0.60 | R | 21.3 (3sig)\n162.754,61.5982 | UBAI-AZT-22 | 0.61 | R | 21.3 (3sig)\n163.1923,60.0945| UBAI-NT60 | 0.60 | R | 19.7 (3sig)\n163.326,60.8289 | UBAI-NT60 | 0.61 | R | 19.7 (3sig)\n162.5432,63.2258| UBAI-ST60 | 0.58 | R | 18.2 (3sig)\n165.6807,67.5331| UBAI-ST60 | 0.60 | R | 20.5 (3sig)\n163.203,60.1212 | OST-CDK | 0.88 | R | 17.6 (5sig)\n163.322,60.5154 | OST-CDK | 0.89 | R | 17.4 (5sig)\n162.0689,58.8652| OST-CDK | 0.90 | R | 17.1 (5sig)\n162.763,60.9338 | OST-CDK | 0.91 | R | 17.1 (5sig)\n162.9998,61.5419| OST-CDK | 0.92 | R | 17.4 (5sig)\n163.9448,59.5613| OST-CDK | 0.93 | R | 17.0 (5sig)\n163.6954,64.0521| OST-CDK | 0.94 | R | 17.0 (5sig)\n162.6205,63.4638| OST-CDK | 0.95 | R | 16.3 (5sig)\n165.0186,66.4922| OST-CDK | 0.96 | R | 16.5 (5sig)\n153.8253,23.8459| OPD60 | 0.81 | R | 18.7 (5sig)\n152.1807,20.2581| OPD60 | 0.82 | R | 19.6 (5sig)\n157.2987,24.1633| OPD60 | 0.83 | R | 19.6 (5sig)\n152.4550,21.9925| OPD60 | 0.84 | R | 19.7 (5sig) \n\nAbAO and UBAI observations have been calibrated using nearby stars from the Pan-STARRS catalog in sdss r, g, i and z, measured with STDpipe [3]. OST-CDK uses the APASS catalogs. OPD observations use Gaia/DR3 and RPmag for calibration.\n\nThe GRANDMA telescope network also observed the ZTF candidates (Anumarlapudi et al. GCN 34089). However, according to Fulton et al. GCN 34096, AT2023lxu and AT2023lxt are sources with an history prior to the GW alert. We report only our classification for AT2023lxx and AT2023lxs.\n\nAs time reference (T0), we choose: for AT 2023lxs 2023-06-27T04:38:47.999 UT (60122.19361110 MJD); for AT 2023lxx 2023-06-27T05:47:03 UT (60122.24100694 MJD) \n\nIn the following table, we report a subset of the preliminary photometry of our observations.\n\nZTF23aaptudb/AT2023lxs:\n\nT-T0 (day) |MJD | Obser. |Exposure| Filter | Upp.Lim. (AB)\n________________________________________________________________________\n0.46 |60122.64983| NOWT |4x200s | B | 20.4 (5sig)\n\nZTF23aaptusa/AT2023lxx:\n\nT-T0 (day) |MJD | Obser. |Exposure| Filter | Upp.Lim. (AB)\n________________________________________________________________________\n0.44 |60122.67498| NOWT |4x200s | B | 20.6 (5sig)\n\nOur observations have been calibrated using nearby stars from the Pan-STARRS catalog in g and with color correction to convert it in B using STDPipe [3].\n\nThe galaxies of ZTF23aaptudb/AT2023lxs and ZTF23aaptusa/AT2023lxx in B-band are detected at a level consistent with catalogs and no clear decrease of the sources is detected. This is in agreement with data available at https://www.wis-tns.org/object/2023lxs, https://www.wis-tns.org/object/2023lxx, and Ahumada et al. #GCN 34100.\n\nGRANDMA is a worldwide coordinated telescope network (grandma.ijclab.in2p3.fr) devoted to the observation of transients in the context of multi-messenger astrophysics [4]. Kilonova-Catcher (KNC) is the citizen science program of GRANDMA (http://kilonovacatcher.in2p3.fr/).\n\n[1] Ducoin et al. 10.1093/mnras/staa114\n[2] Agayeva et al. 10.1117/12.2630240\n[3] Karpov: STDPipe software (https://ascl.net/2112.006)\n[4] Antier et al. 10.1093/mnras/staa1846\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg4MjQ3ODMyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.IE73LYny90OukVWbPZhxp9gwuemiVBWVy4EYbB7sSuA\n\n",
"published": "2023-07-01T21:43:58.442261Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-01T21:43:58.442281Z",
"modified": "2023-07-01T21:43:58.449805Z",
"targets": []
},
{
"id": 789,
"topic": "gcn.circular",
"uuid": "d33aaa2f-27f5-4a88-bd32-d706b61f7d27",
"title": "LIGO/Virgo/KAGRA S230627c: Upper limits from Swift/BAT-GUANO",
"submitter": "Hop gcn.circular",
"authors": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"data": {
"date": "23/07/01 03:37:08 GMT",
"from": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"title": "GCN CIRCULAR",
"number": "34128",
"subject": "LIGO/Virgo/KAGRA S230627c: Upper limits from Swift/BAT-GUANO"
},
"message_text": "Gayathri Raman (PSU), Samuele Ronchini (PSU), Aaron Tohuvavohu (U Toronto), James DeLaunay (U Alabama), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:\n\nSwift/BAT was observing 99.2% of the GW localization probability (Bilby.multiorder.fits,0) at merger time.\nThe entirety of the GW 90% credible region is contained inside the 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^-8 erg/s/cm^2:\n\nBin duration (s) |\thard\t\tnormal\t\tsoft\t\tGRB 170817A\n----------------------------------------------------\n0.256\t\t\t |\t7.0\t\t7.7\t\t4.9\t\t8.3\n1.024\t\t\t |\t3.6\t\t4.0\t\t2.5\t\t4.2\n4.096\t\t\t |\t1.9\t\t2.2\t\t1.4\t\t2.3\n16.384\t\t \t |\t1.2\t\t1.3\t\t0.8\t\t1.4\n\nFor a median distance of 291 Mpc, we derive luminosity upper limits (in units of 10^47 erg/s) as follows:\n\nBin duration (s) |\thard\t\tnormal\t\tsoft\t\tGRB 170817A\n-----------------------------------------------------\n0.256\t\t\t |\t7.1\t\t7.8\t\t5.0\t\t8.4\n1.024\t\t\t |\t3.6\t\t4.0\t\t2.5\t\t4.3\n4.096\t\t\t |\t2.0\t\t2.2\t\t1.4\t\t2.3\n16.384\t\t\t |\t1.2\t\t1.3\t\t0.8\t\t1.4\n\nThe upper limits as function of sky position are plotted here, alongside the GW localization:\nhttps://doi.org/10.5281/zenodo.8102958\n\nThe corresponding fits file can be found here:\nhttps://doi.org/10.5281/zenodo.8102951\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg4MTgyNjM0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.nBL1NJteALf3CdkfUpaSrLBOfaRYadcFScsPX9QImy0\n\n",
"published": "2023-07-01T03:37:20.375911Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-01T03:37:20.375946Z",
"modified": "2023-07-01T03:37:20.382423Z",
"targets": []
},
{
"id": 707,
"topic": "gcn.circular",
"uuid": "7606ce8a-9c7a-446f-ae90-33f21bcc1d59",
"title": "LIGO/Virgo/KAGRA S230627c: Additional observations from the Zwicky Transient Facility",
"submitter": "Hop gcn.circular",
"authors": "Tomas Fernando Ahumada Mena at Caltech <tahumada@umd.edu>",
"data": {
"date": "23/06/28 07:26:26 GMT",
"from": "Tomas Fernando Ahumada Mena at Caltech <tahumada@umd.edu>",
"title": "GCN CIRCULAR",
"number": "34100",
"subject": "LIGO/Virgo/KAGRA S230627c: Additional observations from the Zwicky Transient Facility"
},
"message_text": "Tomas Ahumada (CIT), Igor Andreoni (UMD), Akash Anumarlapudi (UWM), Viraj Karambelkar (CIT), Harsh Kumar (IITB), Theophile du Laz (CIT), Simeon Reusch (DESY), Anirudh Salgundi (IITB), Robert Stein (CIT), Vishwajeet Swain (IITB), Gaurav Waratkar (IITB), Shreya Anand (CIT), Eric Bellm (UW), Varun Bhalerao (IITB), Brad Cenko (UMD), Michael Coughlin (UMN), Brian Healy (UMN), David Kaplan (UWM), Mansi Kasliwal (CIT), Jannis Necker (DESY), D. Perley (LJMU), Avery Wold (IPAC) report on behalf of the ZTF and GROWTH collaborations:\n\nWe reobserved the localization region of the LVK trigger S230627c (GCN 34086) with the Palomar 48-inch telescope equipped with the 47 square-degree Zwicky Transient Facility (ZTF) camera (Graham et al., 2019; Bellm et al., 2019). We obtained images in the g- and r-bands of the Bilby map (GCN 34087) beginning at ~26.2 hours after the LVK trigger time, covering 78.6% (106.2 sq deg) of the probability enclosed in the localization region.\n\nWe queried the ZTF alert stream using AMPEL (Nordin et al. 2019) and Kowalski (Duev et al. 2019) through Fritz (Coughlin et al. 2023), and emgwcave (Karambelkar et al. in prep). We required at least 2 detections separated by at least 15 minutes to select against moving objects. Furthermore, we cross-match our candidates with the Minor Planet Center to flag known asteroids, reject stellar sources (Tachibana and Miller 2018), and apply machine learning algorithms (Mahabal et al. 2019). We require that no spatially coincident ZTF alerts were issued before the detection time of the LVK trigger. We also run forced photometry on ZTF images (Masci et al. 2019) and ATLAS images (Tonry et al. 2018, Smith et al. 2020) and require no 3- and 5-sigma detections before the LVK trigger respectively.\n\nOur observations yielded no new candidates. Furthermore, the candidates circulated on our initial GCN 34089 (Anumarlapudi et al.) show a flat evolution.\n\nZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC, USA, WIS, Israel; OKC, Sweden; JSI/UMd, USA; U Washington, USA; DESY, Germany; MOST, Taiwan; UW Milwaukee, USA; LANL USA; Tokyo Tech, Japan; IITB, India; IIA, India; LJMU, UK; TTU, USA; SDSU, USA and USyd, Australia. ZTF acknowledges the generous support of the NSF under AST MSIP Grant No 1440341. GROWTH acknowledges the generous support of the NSF under PIRE Grant No 1545949. Alert distribution service provided by DIRAC@UW (Patterson et al. 2019). Alert database searches are done by AMPEL (Nordin et al. 2019) and Kowalski (Duev et al. 2019). Fritz and SkyPortal acknowledge the generous support of The Gordon and Betty Moore Foundation, through the Data-Driven Investigator Program.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg3OTM3MTkyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Rlca03vNrQy8tg6gOVznqS7ltzTGnPD1k7IFH3n7r48\n\n",
"published": "2023-06-28T07:26:38.015589Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-28T07:26:38.015610Z",
"modified": "2023-06-28T07:26:38.022701Z",
"targets": []
},
{
"id": 697,
"topic": "gcn.circular",
"uuid": "2d63a238-407b-4720-94e0-29c8cb01b2f2",
"title": "LIGO/Virgo/KAGRA S230627c: ATLAS information on the ZTF candidates",
"submitter": "Hop gcn.circular",
"authors": "Michael Fulton at Queen's U, Belfast <mfulton07@qub.ac.uk>",
"data": {
"date": "23/06/27 20:11:36 GMT",
"from": "Michael Fulton at Queen's U, Belfast <mfulton07@qub.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34096",
"subject": "LIGO/Virgo/KAGRA S230627c: ATLAS information on the ZTF candidates"
},
"message_text": "M. D. Fulton (QUB), S. J. Smartt (Oxford/QUB), K. W. Smith, S. Srivastav, D. R. Young, M. Nicholl, M. McCollum, T. Moore, J. Weston, X. Sheng (QUB), L. Shingles (GSI/QUB), J. Sommer (LMU/QUB), H. Stevance, L. Rhodes, A. Andersson (Oxford), L. Denneau, J. Tonry, H. Weiland, A. Lawrence, R. Siverd (IfA, University of Hawaii), N. Erasmus, W. Koorts (South African Astronomical Observatory), A. Jordan, V. Suc (UAI, Obstech), A. Rest (STScI), T.-W. Chen (TUM), C. Stubbs (Harvard)\n\nHere we report the ATLAS forced photometry (Shingles et al. AstroNote #2021-7; Smith et al., 2020, PASP, 132:085002) at the coordinates of the ZTF candidates highlighted in Anumarlapudi et al. (GCN Circ. 34089). We rule out AT2023lxu and disfavour AT2023lxt as optical counterparts to the compact binary merger event S230627c (LIGO-Virgo-KAGRA Scientific Collaboration GCN Circ. 34086). \n\nWe measure multiple 3Ï detections at the location of AT2023lxu >6 days before the LVK trigger time, implying AT2023lxu is most likely a faint SN. Two 3Ï detections of AT2023lxt were made prior to the LVK trigger, suggesting this is also not a viable candidate. We note that the AT2023lxt detections are marginal, being at the observing limit of ATLAS, and we are uncertain whether or not these detections represent subtraction residuals due to the close proximity to the underlying galaxy core. We present these 3Ï measurements below, which represent nightly flux stacks and have not been corrected for foreground extinction. Phase is with respect to the LVK trigger time of MJD 60122.079 (2023-06-27 01:53:37 UTC).\n\n+----------------------+--------------+------------------+--------+---------------------+\n| Candidate Name | MJD | Phase (Days) | Filter | Mag +/- MagErr |\n+----------------------+--------------+------------------+--------+---------------------+\n| | 60106.266 | -15.812 | c | >20.84 |\n+ +--------------+------------------+--------+---------------------+\n| | 60108.262 | -13.817 | c | 20.37 +/- 0.32 |\n+ +--------------+------------------+--------+---------------------+\n| AT2023lxu | 60110.265 | -11.814 | c | 19.97 +/- 0.16 |\n+ +--------------+------------------+--------+---------------------+\n| | 60112.263 | -9.816 | c | 19.97 +/- 0.18 |\n+ +--------------+------------------+--------+---------------------+\n| | 60114.264 | -7.815 | c | >19.98 |\n+ +--------------+------------------+--------+---------------------+\n| | 60116.280 | -5.799 | c | 20.27 +/- 0.20 |\n+----------------------+--------------+------------------+--------+---------------------+\n| | 60112.262 | -9.817 | c | >20.41 |\n+ +--------------+------------------+--------+---------------------+\n| AT2023lxt | 60114.277 | -7.802 | c | 20.50 +/- 0.25 |\n+ +--------------+------------------+--------+---------------------+\n| | 60116.283 | -5.796 | c | 20.60 +/ 0.25 |\n+ +--------------+------------------+--------+---------------------+\n| | 60118.262 | -3.817 | o | >20.30 |\n+----------------------+--------------+------------------+--------+---------------------+\n\nThe Asteroid Terrestrial-impact Last Alert System (ATLAS) project is primarily funded to search for Near-Earth asteroids through NASA grants NN12AR55G, 80NSSC18K0284, and 80NSSC18K1575; byproducts of the NEO search include images and catalogs from the survey area. This work was partially funded by Kepler/K2 grant J1944/80NSSC19K0112 and HST GO-15889, and STFC grants ST/T000198/1 and ST/S006109/1. The ATLAS science products have been made possible through the contributions of the University of Hawaii Institute for Astronomy, the Queen's University Belfast, the Space Telescope Science Institute, the South African Astronomical Observatory, and The Millennium Institute of Astrophysics (MAS), Chile.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg3ODk2NzAyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.7DEp1QiHyDVTRbWJLUmDzTON2RPrR-2rgDwFevLdvJk\n\n",
"published": "2023-06-27T20:11:47.583011Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-27T20:11:47.583030Z",
"modified": "2023-06-27T20:11:47.589342Z",
"targets": []
},
{
"id": 696,
"topic": "gcn.circular",
"uuid": "254a0ddc-1951-4286-9dd0-63227d7ac9b5",
"title": "LIGO/Virgo/KAGRA S230627c: Upper limits from Fermi-GBM Observations",
"submitter": "Hop gcn.circular",
"authors": "Sarah Dalessi at UAH <sd0104@uah.edu>",
"data": {
"date": "23/06/27 19:14:07 GMT",
"from": "Sarah Dalessi at UAH <sd0104@uah.edu>",
"title": "GCN CIRCULAR",
"number": "34095",
"subject": "LIGO/Virgo/KAGRA S230627c: Upper limits from Fermi-GBM Observations"
},
"message_text": "S. Dalessi (UAH) reports on behalf of the Fermi-GBM Team:\n\n\nFor S230627c (GCN 34086 and GCN 34087) and using the updated Bilby skymap, Fermi-GBM was observing 99.8% 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 S230627c . 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 [1,2,3], the most sensitive, coherent search for GRB-like signals, was run from +/-30 s around merger time, and also identified no counterpart candidates.\n\nFor Fermi, part of the LVK localization region is behind the Earth, located at an RA.8, Dec=-18.5 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: 1.9 3.3 5.4\n1.024 s: 0.7 0.9 1.5\n8.192 s: 0.2 0.3 0.5\n\nAssuming the median luminosity distance of 291.0 Mpc from the GW detection, we estimate the following intrinsic luminosity upper limits over the 1 keV-10 MeV energy range (in units of 10^50 erg/s):\n\nTimescale Soft Normal Hard\n------------------------------------\n0.128s: 0.047 0.066 0.215\n1.024s: 0.015 0.019 0.060\n8.192s: 0.004 0.006 0.018\n\n[1] Blackburn et al. 2015, ApJS 217, 8\n[2] Goldstein et al. arXiv:1612.02395\n[3] Goldstein et al. arXiv:1903.12597\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg3ODkzMjUzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.fu6eZPXP16huWN3WwvktNqEDIH2hJC3uw64L0dEHBOY\n\n",
"published": "2023-06-27T19:14:18.765110Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-27T19:14:18.765130Z",
"modified": "2023-06-27T19:14:18.777594Z",
"targets": []
},
{
"id": 694,
"topic": "gcn.circular",
"uuid": "b0b73920-0496-4904-856c-6fe5ae8c8cb4",
"title": "LIGO/Virgo/KAGRA S230627c: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/06/27 16:38:53 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34093",
"subject": "LIGO/Virgo/KAGRA S230627c: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-OAGH robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Mexico (OAGH National Institute for Astrophysics, Optics and Electronics) started inspect of the LIGO/Virgo/KAGRA S230627c errorbox 15958 sec after notice time and 16028 sec after trigger time at 2023-06-27 06:20:45 UT, with upper limit up to 16.4 mag. The observations began at zenith distance = 65 deg. The sun altitude is -33.7 deg.\n\nThe galactic latitude b = 58 deg., longitude l = 164 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/ligo_1.php?id\u0012441\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 16119 | 2023-06-27 06:20:45 | MASTER-OAGH | (00h 15m 44.99s , +70d 00m 53.5s) | C | 180 | 15.8 |\n 16318 | 2023-06-27 06:24:05 | MASTER-OAGH | (00h 13m 10.67s , +64d 20m 45.1s) | C | 180 | 15.8 |\n 17118 | 2023-06-27 06:37:25 | MASTER-OAGH | (00h 12m 19.27s , +62d 26m 22.0s) | C | 180 | 16.4 |\n 17319 | 2023-06-27 06:40:45 | MASTER-OAGH | (00h 15m 43.95s , +70d 03m 59.5s) | C | 180 | 15.2 |\n 17519 | 2023-06-27 06:44:06 | MASTER-OAGH | (00h 13m 06.38s , +64d 21m 14.6s) | C | 180 | 16.2 |\n 19098 | 2023-06-27 07:10:25 | MASTER-OAGH | (00h 12m 13.26s , +62d 29m 06.9s) | C | 180 | 15.3 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg3ODgzOTM4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.3RP8emHwMLCgJu45HSizsR3tBiwy2T5BmZviENuBeI0\n\n",
"published": "2023-06-27T16:39:03.808748Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-27T16:39:03.808787Z",
"modified": "2023-06-27T16:39:03.814280Z",
"targets": []
},
{
"id": 693,
"topic": "gcn.circular",
"uuid": "dc108d28-cdec-4c6c-8895-005c1c7d7be6",
"title": "LIGO/Virgo/Kagra S230627c: NED Galaxies in the Localization Volume",
"submitter": "Hop gcn.circular",
"authors": "David Cook at Caltech/IPAC-NED <dcook@ipac.caltech.edu>",
"data": {
"date": "23/06/27 16:14:41 GMT",
"from": "David Cook at Caltech/IPAC-NED <dcook@ipac.caltech.edu>",
"title": "GCN CIRCULAR",
"number": "34092",
"subject": "LIGO/Virgo/Kagra S230627c: NED Galaxies in the Localization Volume"
},
"message_text": "David O. Cook (Caltech/IPAC), Rick Ebert (Caltech/IPAC), George Helou (Caltech/IPAC), Joseph M. Mazzarella (Caltech/IPAC), Marion Schmitz (Caltech/IPAC), and Leo Singer (NASA/GSFC)\nOn behalf of the NASA/IPAC Extragalactic Database (NED) Team.\n\nWe spatially cross-matched the LVK S230627c-4-Update sky localization with the NED Local Volume Sample (NED-LVS; Cook et al. 2023), which is a subset of NED with a redshift or redshift-independent distance less than 1000 Mpc. We find 2531 galaxies within the 90% containment volume, and we list here the top 20 galaxies located in the 90% volume sorted by the joint probability of the 3D localization and the WISE W1 luminosity (an observable proxy for stellar mass). For the full list of galaxies in the 90% volume go to the NED Gravitational Wave Followup service (https://ned.ipac.caltech.edu/uri/NED::GWF/).\n\nThe NED-GWF service provides downloadable galaxy lists and visualizations for candidate host galaxies. For each GW alert, these products are automatically generated and made available within minutes to expedite efficient electromagnetic followup observations. The NED top 20 list is sorted by the joint probability of the 3D localization and the WISE W1 luminosity, but users can sort on additional pre-computed prioritization metrics (star formation rate, P_3D*P_SFR; and specific star formation rate, P_3D*P_sSFR; etc.) which are available via downloading the entire galaxy list inside the event's probability volume.\n\nGalaxy RA Dec Dist m_NUV mErr m_Ks mErr m_W1 mErr P_3D P_3D_LumW1\n (Deg) (Deg) (Mpc) (AB) (mag) (Vega) (mag) (Vega) (mag) (Prob) (Prob)\n--------------------------------------------- ---------------- -------------- ---------- --------- --------- --------- -------- -------- -------- ------------ -------------\n WISEA J102356.11+283710.630 | 155.98380 | 28.61961 | 249.69 | 19.76 | 0.09 | 11.75 | 0.06 | 10.19 | 0.01 | 8.89e-01 | 3.83e-03\n WISEA J102356.11+283710.630 | 155.98380 | 28.61961 | 249.69 | 19.76 | 0.09 | 11.75 | 0.06 | 10.19 | 0.01 | 8.89e-01 | 3.83e-03\n WISEA J103543.86+373517.630 | 158.93274 | 37.58823 | 247.97 | nan | nan | 12.46 | 0.08 | 10.53 | 0.01 | 7.89e-01 | 2.44e-03\n WISEA J110213.02+645925.030 | 165.55424 | 64.99022 | 353.66 | 20.05 | 0.14 | 12.55 | 0.08 | 11.59 | 0.01 | 8.75e-01 | 2.09e-03\n WISEA J105943.56+650406.730 | 164.93154 | 65.06841 | 382.69 | nan | nan | 13.16 | 0.13 | 11.84 | 0.01 | 8.96e-01 | 1.98e-03\n WISEA J103213.97+401616.630 | 158.05814 | 40.27125 | 353.93 | nan | nan | 11.25 | 0.09 | 11.41 | 0.01 | 6.77e-01 | 1.91e-03\n WISEA J105410.27+544851.830 | 163.54295 | 54.81439 | 321.95 | 19.72 | 0.14 | 13.25 | 0.05 | 11.46 | 0.01 | 7.72e-01 | 1.71e-03\n MCG +09-18-04530 | 163.34551 | 56.31446 | 348.07 | nan | nan | 12.61 | 0.02 | 11.43 | 0.01 | 6.13e-01 | 1.63e-03\n WISEA J103906.07+444224.430 | 159.77528 | 44.70674 | 424.01 | 21.04 | 0.12 | 12.33 | 0.09 | 12.29 | 0.01 | 8.99e-01 | 1.62e-03\n WISEA J103626.50+444349.830 | 159.11038 | 44.73046 | 423.33 | nan | nan | 13.20 | 0.11 | 12.34 | 0.01 | 8.94e-01 | 1.53e-03\n WISEA J103228.87+400854.330 | 158.12024 | 40.14840 | 302.94 | nan | nan | 12.42 | 0.09 | 10.73 | 0.01 | 3.95e-01 | 1.52e-03\n MCG +10-15-12330 | 160.89709 | 58.10631 | 324.40 | nan | nan | 11.54 | 0.10 | 11.69 | 0.01 | 8.32e-01 | 1.52e-03\n WISEA J110213.05+661002.630 | 165.55419 | 66.16735 | 353.71 | nan | nan | 12.15 | 0.09 | 11.98 | 0.01 | 8.70e-01 | 1.45e-03\n WISEA J103141.11+360123.930 | 157.92133 | 36.02338 | 390.76 | nan | nan | 12.80 | 0.05 | 12.22 | 0.01 | 8.70e-01 | 1.42e-03\n WISEA J103151.38+355744.630 | 157.96421 | 35.96247 | 398.10 | nan | nan | 12.79 | 0.13 | 12.31 | 0.01 | 8.88e-01 | 1.38e-03\n WISEA J105404.26+544941.130 | 163.51771 | 54.82815 | 335.96 | nan | nan | 12.30 | 0.08 | 11.82 | 0.01 | 7.94e-01 | 1.38e-03\n WISEA J103626.60+444407.830 | 159.11067 | 44.73547 | 414.76 | 20.71 | 0.08 | 13.01 | 0.09 | 12.37 | 0.01 | 8.62e-01 | 1.38e-03\n WISEA J105336.54+545204.630 | 163.40236 | 54.86795 | 325.02 | nan | nan | 11.84 | 0.08 | 11.75 | 0.01 | 7.76e-01 | 1.35e-03\n WISEA J103407.92+424833.130 | 158.53304 | 42.80921 | 402.87 | nan | nan | 12.61 | 0.09 | 12.33 | 0.01 | 8.60e-01 | 1.34e-03\n MCG +09-18-04130 | 162.94749 | 55.38566 | 336.20 | nan | nan | 11.39 | 0.07 | 11.42 | 0.01 | 5.14e-01 | 1.29e-03\n WISEA J103747.36+394846.030 | 159.44730 | 39.81275 | 311.18 | 20.64 | 0.09 | 11.55 | 0.08 | 11.63 | 0.01 | 6.81e-01 | 1.21e-03\n\nTable: Top 20 galaxies in NED-LVS that fall in the 90% probability volume for S230627c sorted by the joint probability of 3D position and WISE W1 luminosity (P_3D*P_LumW1). Galaxy is the NED preferred name. RA and Dec are the Equatorial coordinates in degrees (J2000). Distance is the distance to the galaxy in Mpc. m_NUV and mErr_NUV are the apparent magnitude and error from GALEX. m_Ks and mErr_Ks are the apparent magnitude and error from 2MASS. m_W1 and mErr_W1 are the apparent magnitude and error from AllWISE. P_3D is the probability that the galaxy is in the volume given the distance of GW event. P_3D_LumW1 is the joint probability within the volume weighted by the WISE1 luminosity of the galaxy (P_3D * P_LumW1).\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg3ODgyNDg3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.xhEOfBtxNwxKi-3JQcfbaEkihDUx_3UCC7yjo3iiR-s\n\n",
"published": "2023-06-27T16:14:53.061104Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-27T16:14:53.061124Z",
"modified": "2023-06-27T16:14:53.067339Z",
"targets": []
},
{
"id": 691,
"topic": "gcn.circular",
"uuid": "f8783161-e8f3-469c-899c-92ecdec4a4b1",
"title": "LIGO/Virgo/KAGRA S230627c: Correction to HasMassGap probability",
"submitter": "Hop gcn.circular",
"authors": "thomas.sainrat@iphc.cnrs.fr",
"data": {
"date": "23/06/27 14:32:04 GMT",
"from": "thomas.sainrat@iphc.cnrs.fr",
"title": "GCN CIRCULAR",
"number": "34090",
"subject": "LIGO/Virgo/KAGRA S230627c: Correction to HasMassGap probability"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nThe trigger S230627c had incorrect HasMassGap probability reported in the Update Circular number 34087. The correct value is 14% as reported in the Update Notice.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg3ODc2MzMwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.5EqlG01IptPnfpc8sIy1Ph8T2eUr0qfq11MXbgFbuew\n\n",
"published": "2023-06-27T14:32:15.745816Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-27T14:32:15.745835Z",
"modified": "2023-06-27T14:32:15.750865Z",
"targets": []
},
{
"id": 681,
"topic": "gcn.circular",
"uuid": "1dd39f88-6bed-412c-bf4e-64b5c23eef5c",
"title": "LIGO/Virgo/KAGRA S230627c: Zwicky Transient Facility observations and candidates",
"submitter": "Hop gcn.circular",
"authors": "akashjanaki98@gmail.com",
"data": {
"date": "23/06/27 09:08:46 GMT",
"from": "akashjanaki98@gmail.com",
"title": "GCN CIRCULAR",
"number": "34089",
"subject": "LIGO/Virgo/KAGRA S230627c: Zwicky Transient Facility observations and candidates"
},
"message_text": "Akash Anumarlapudi (UWM), Tomas Ahumada (CIT), Mansi Kasliwal (CIT), Viraj Karambelkar (CIT), Harsh Kumar (IITB), Theophile du Laz (CIT), Simeon Reusch (DESY), Anirudh Salgundi (IITB), Robert Stein (CIT), Vishwajeet Swain (IITB), Gaurav Waratkar (IITB), Avery Wold (IPAC), Shreya Anand (CIT), Igor Andreoni (UMD), Eric Bellm (UW), Varun Bhalerao (IITB), Brad Cenko (UMD), Michael Coughlin (UMN), Brian Healy (UMN), David Kaplan (UWM), Jannis Necker (DESY), D. Perley (LJMU) report on behalf of the ZTF and GROWTH collaborations:\n\nWe observed the localization region of the LVK trigger S230627c (GCN 34086) with the Palomar 48-inch telescope equipped with the 47 square-degree Zwicky Transient Facility (ZTF) camera (Graham et al., 2019; Bellm et al., 2019). We obtained images in the g- and r-bands of the Bilby map (GCN 34087) beginning at ~2.2 hours after the LVK trigger time, covering 78.3% (105.3 sq deg) of the probability enclosed in the localization region.\n\nWe queried the ZTF alert stream using Kowalski (Duev et al. 2019) through Fritz (Coughlin et al. 2023), emgwcave (Karambelkar et al. in prep), AMPEL (Nordin et al. 2019), and ZTFReST (Andreoni & Coughlin et al., 2021). We required at least 2 detections separated by at least 15 minutes to select against moving objects. Furthermore, we cross-match our candidates with the Minor Planet Center to flag known asteroids, reject stellar sources (Tachibana and Miller 2018), and apply machine learning algorithms (Mahabal et al. 2019). We require that no spatially coincident ZTF alerts were issued before the detection time of the LVK trigger. We also run forced photometry on ZTF images (Masci et al. 2019) and ATLAS images (Tonry et al. 2018, Smith et al. 2020) and require no detections before the LVK trigger.\n\nFour sources passed our criteria and are inside the 95% error region:\n\n+--------------------------------------------------------------------------------+\n| ZTF Name | IAU Name | RA (deg) | DEC (deg) | Filter | Mag | MagErr |\n+--------------------------------------------------------------------------------+\n| ZTF23aaptsuy | AT2023lxu | 160.2019569 | +41.9681656 | r | 20.20 | 0.08 |\n| ZTF23aapttaw | AT2023lxt | 164.6898146 | +60.9545924 | r | 21.11 | 0.20 |\n| ZTF23aaptudb | AT2023lxs | 166.5566080 | +78.5596361 | r | 20.86 | 0.16 |\n| ZTF23aaptusa | AT2023lxx | 162.0445716 | +71.8414115 | g | 20.89 | 0.19 |\n+--------------------------------------------------------------------------------+\n\nZTF23aaptsuy (AT2023lxu) is 2.7'' away from a WISE galaxy WISEA J104048.69+415805.3 with a spectroscopic redshift of z=0.092961 (luminosity distance of 440 Mpc assuming Planck+18 cosmology) which is at the edge of the 3-sigma boundary of the LVK line of sight distance estimate.\n\nZTF23aaptudb (AT2023lxs) is 0.07'' away from a galaxy that has a Legacy Survey DR8 (LS; Duncan, 2022) photometric redshift of photo-z = 0.118±0.07, which suggests that it might not be associated with the LVK trigger.\n\nZTF23aaptusa (AT2023lxx) is 0.75'' away from a galaxy that has an LS photometric redshift of photo-z = 0.175±0.044, suggesting that it might not be associated with the LVK trigger. We also caution that the centroid position shows a slight dispersion in the three detections. \n\nZTF23aapttaw (AT2023lxt) is 0.236'' away from an LS source with a photo-z = 0.254±0.12, outside of the LVK volume.\n\n\nFurther follow-up of these candidates will continue.\n\nZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC, USA, WIS, Israel; OKC, Sweden; JSI/UMd, USA; U Washington, USA; DESY, Germany; MOST, Taiwan; UW Milwaukee, USA; LANL USA; Tokyo Tech, Japan; IITB, India; IIA, India; LJMU, UK; TTU, USA; SDSU, USA and USyd, Australia. ZTF acknowledges the generous support of the NSF under AST MSIP Grant No 1440341. GROWTH acknowledges the generous support of the NSF under PIRE Grant No 1545949. Alert distribution service provided by DIRAC@UW (Patterson et al. 2019). Alert database searches are done by AMPEL (Nordin et al. 2019) and Kowalski (Duev et al. 2019). GROWTH India telescope is located at the Indian Astronomical Observatory (Hanle), operated by the Indian Institute of Astrophysics (IIA). GROWTH-India project is supported by SERB and administered by IUSSTF, under grant number IUSSTF/PIRE Program/GROWTH/2015-16 and IUCAA.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg3ODU2OTMyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.hJCQ3WoLdT4TfYxL1Uj48F3SS4JO_KG5RSMmzczHFIE\n\n",
"published": "2023-06-27T09:08:58.130352Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-27T09:08:58.130372Z",
"modified": "2023-06-27T09:08:58.135201Z",
"targets": []
},
{
"id": 677,
"topic": "gcn.circular",
"uuid": "21090d6a-52f2-4f75-a1a4-9f4dc9c627bb",
"title": "LIGO/Virgo/KAGRA S230627c: 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": "23/06/27 08:50:43 GMT",
"from": "Motoko Serino at Aoyama Gakuin U. <serino@phys.aoyama.ac.jp>",
"title": "GCN CIRCULAR",
"number": "34088",
"subject": "LIGO/Virgo/KAGRA S230627c: Coverage and upper limits from MAXI/GSC observations"
},
"message_text": "N. Kawai (RIKEN), H. Negoro, M. Nakajima (Nihon U.),\nT. Mihara (RIKEN),\nS. Sugita, M. Serino, H. Hiramatsu, H. Nishikawa (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 S230627c at 2023-06-27 01:53:37.819 UTC (GCN 34086).\n\nAt the trigger time of S230627c, the high-voltage of MAXI/GSC was on.\nThe instantaneous field of view of GSC at the GW trigger time covered 5% 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 64%\nof the 90% credible region of the bayestar skymap from 01:53:37 to 03:25:36 UTC (T0+0 to T0+5519 sec).\n\nNo significant new source was found in the region in the one-orbit scan observation.\nBecause the 90% credible region of this event was observed by degraded camera,\na typical 1-sigma averaged upper limit obtained in one scan observation\nis 140 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg3ODU1ODQ5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.JWTowu-ZXreOOr2U3W7T823TQeWEhv-7c2bD8tKOXoo\n\n",
"published": "2023-06-27T08:50:54.795533Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-27T08:50:54.795553Z",
"modified": "2023-06-27T08:50:54.804132Z",
"targets": []
},
{
"id": 661,
"topic": "gcn.circular",
"uuid": "2d3a7b19-c630-44d8-b701-353442b1c341",
"title": "LIGO/Virgo/KAGRA S230627c: Updated Sky localization and EM Bright Classification",
"submitter": "Hop gcn.circular",
"authors": "jgolomb@caltech.edu",
"data": {
"date": "23/06/27 04:37:12 GMT",
"from": "jgolomb@caltech.edu",
"title": "GCN CIRCULAR",
"number": "34087",
"subject": "LIGO/Virgo/KAGRA S230627c: 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 S230627c (GCN Circular 34086). 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/S230627c\n\nBased on posterior support from parameter estimation [1], under the assumption that the candidate S230627c 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 any one of the binary components lie between 3 to 5 solar mass (HasMassgap) is 26%.\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 82 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 291 +/- 64 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, 1 (2020)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg3ODQwNjM4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.N8oEU4EHKSYMTLz-DGCXjxWYTKLfRxB1aD3W-F70j3I\n\n",
"published": "2023-06-27T04:37:23.533380Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-27T04:37:23.533399Z",
"modified": "2023-06-27T04:37:23.539145Z",
"targets": []
},
{
"id": 659,
"topic": "gcn.circular",
"uuid": "e7a7513a-8202-44c4-8fd7-562319ef9b12",
"title": "LIGO/Virgo/KAGRA S230627c: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "David Hui at Chungnam National University <huichungyue@gmail.com>",
"data": {
"date": "23/06/27 02:28:06 GMT",
"from": "David Hui at Chungnam National University <huichungyue@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34086",
"subject": "LIGO/Virgo/KAGRA S230627c: 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 S230627c during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-06-27 01:53:37.819 UTC (GPS\ntime: 1371866035.819). The candidate was found by the CWB [1], MBTA\n[2], GstLAL [3], oLIB [4], PyCBC Live [5], and SPIIR [6] analysis\npipelines.\n\nS230627c 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/S230627c\n\nThe classification of the GW signal, in order of descending\nprobability, is NSBH (49%), BBH (48%), 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 <1%. [7] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [7] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat any one of the binary components lie between 3 to 5 solar mass\n(HasMassgap) is 26%.\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 [8], distributed via GCN notice about 31 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [8], 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 90\ndeg2. Marginalized over the whole sky, the a posteriori luminosity\ndistance estimate is 278 +/- 68 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\n<https://emfollow.docs.ligo.org/userguide/>.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n [2] Aubin et al. CQG 38, 095004 (2021)\n [3] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [4] Lynch et al. PRD 95, 104046 (2017)\n [5] Dal Canton et al. ApJ 923, 254 (2021)\n [6] Chu et al. PRD 105, 024023 (2022)\n [7] Chatterjee et al. ApJ 896, 54 (2020)\n [8] 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg3ODMyODkxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.BzhRK-R2l0suNJEKUsZSsYABPvzb_8SyoUqkKot55G0\n\n",
"published": "2023-06-27T02:28:16.773526Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-27T02:28:16.773563Z",
"modified": "2023-06-27T02:28:16.779706Z",
"targets": []
}
]
},
{
"event_id": "S230627m",
"sequences": [
{
"id": 294,
"sequence_number": 1,
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"message": {
"id": 662,
"topic": "igwn.gwalert",
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"title": "S230627m - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"event": {
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"external_coinc": null
},
"message_text": "",
"published": "2023-06-27T04:56:48.030307Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-27T04:56:48.030331Z",
"modified": "2023-06-27T04:56:48.035235Z"
}
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{
"id": 295,
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"message": {
"id": 663,
"topic": "igwn.gwalert",
"uuid": "50d442f7-d65a-49b2-884e-1b2dc5603c4b",
"title": "S230627m - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230627m/view/"
},
"event": {
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"time": "2023-06-27T04:54:07.939Z",
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"sequence_num": 2,
"time_created": "2023-06-27T05:01:20Z",
"superevent_id": "S230627m",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-27T05:01:21.627006Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-27T05:01:21.627031Z",
"modified": "2023-06-27T05:01:21.631999Z"
}
}
],
"references": []
},
{
"event_id": "S230627o",
"sequences": [
{
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"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 665,
"topic": "igwn.gwalert",
"uuid": "54228a8f-7e6a-4b3f-a518-7aa4d33d9339",
"title": "S230627o - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230627o/view/"
},
"event": {
"far": 1.4899e-05,
"time": "2023-06-27T05:20:26.524Z",
"group": "Burst",
"search": "BBH",
"area_50": 1883.3749398538582,
"area_90": 5590.534970751583,
"duration": 0.007729,
"pipeline": "CWB",
"properties": {},
"instruments": [
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"L1"
],
"significant": false,
"skymap_hash": "840525b76fbe4ad7500fde0589cb437b",
"classification": {},
"skymap_version": 0,
"central_frequency": 131.807678
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-06-27T05:21:52Z",
"superevent_id": "S230627o",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-27T05:21:54.117927Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-27T05:21:54.117952Z",
"modified": "2023-06-27T05:21:54.123219Z"
}
},
{
"id": 297,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 666,
"topic": "igwn.gwalert",
"uuid": "628f01d4-5ec0-4311-8d4d-b68f019d9065",
"title": "S230627o - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230627o/view/"
},
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"time": "2023-06-27T05:20:26.524Z",
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"sequence_num": 2,
"time_created": "2023-06-27T05:26:26Z",
"superevent_id": "S230627o",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-27T05:26:27.805953Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-27T05:26:27.806003Z",
"modified": "2023-06-27T05:26:27.812249Z"
}
}
],
"references": []
},
{
"event_id": "S230627v",
"sequences": [
{
"id": 298,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 668,
"topic": "igwn.gwalert",
"uuid": "83b70c52-c260-42b0-92b5-1a0f958ef43f",
"title": "S230627v - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230627v/view/"
},
"event": {
"far": 1.078086461347993e-05,
"time": "2023-06-27T05:42:27.362Z",
"group": "CBC",
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"area_50": 3849.839950583623,
"area_90": 12810.978200503254,
"duration": null,
"pipeline": "spiir",
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"HasRemnant": 1.0
},
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],
"significant": false,
"skymap_hash": "358a86251a10fdf65dd02830313f24d0",
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},
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},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-06-27T05:42:53Z",
"superevent_id": "S230627v",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-27T05:42:54.245706Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-27T05:42:54.245729Z",
"modified": "2023-06-27T05:42:54.250604Z"
}
},
{
"id": 299,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 669,
"topic": "igwn.gwalert",
"uuid": "3b2faa3f-d78d-403e-819d-38c3c4480fbc",
"title": "S230627v - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230627v/view/"
},
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"sequence_num": 2,
"time_created": "2023-06-27T05:47:29Z",
"superevent_id": "S230627v",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-27T05:47:30.825772Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-27T05:47:30.825796Z",
"modified": "2023-06-27T05:47:30.831036Z"
}
}
],
"references": []
},
{
"event_id": "S230627aa",
"sequences": [
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"sequence_number": 1,
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"message": {
"id": 671,
"topic": "igwn.gwalert",
"uuid": "4c390a9a-85da-47f2-a3b9-81ceb86c5547",
"title": "S230627aa - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230627aa/view/"
},
"event": {
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"time": "2023-06-27T06:47:04.588Z",
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"time_created": "2023-06-27T06:48:10Z",
"superevent_id": "S230627aa",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-27T06:48:11.116633Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-27T06:48:11.116658Z",
"modified": "2023-06-27T06:48:11.121741Z"
}
},
{
"id": 301,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 672,
"topic": "igwn.gwalert",
"uuid": "c8ad01c6-ddd1-4ec6-b785-0938d6a137c4",
"title": "S230627aa - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230627aa/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230627aa/view/"
},
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"time": "2023-06-27T06:47:04.588Z",
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"sequence_num": 2,
"time_created": "2023-06-27T06:52:43Z",
"superevent_id": "S230627aa",
"external_coinc": null
},
"message_text": "",
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"sequence_num": 2,
"time_created": "2023-06-27T23:50:18Z",
"superevent_id": "S230627bj",
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"message_text": "",
"published": "2023-06-27T23:50:19.850458Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-27T23:50:19.850484Z",
"modified": "2023-06-27T23:50:19.855489Z"
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}
],
"references": []
},
{
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"message": {
"id": 704,
"topic": "igwn.gwalert",
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"title": "S230628e - PRELIMINARY",
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"data": {
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"published": "2023-06-28T04:59:03.463037Z",
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"title": "S230628e - PRELIMINARY",
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"published": "2023-06-28T05:03:39.145267Z",
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],
"references": []
},
{
"event_id": "S230628ac",
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"message": {
"id": 709,
"topic": "igwn.gwalert",
"uuid": "c51435be-93b5-46c4-84c7-584af48f331d",
"title": "S230628ac - PRELIMINARY",
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"data": {
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"published": "2023-06-28T14:03:18.338153Z",
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"message": {
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"topic": "igwn.gwalert",
"uuid": "1c126d8d-970e-4634-baa0-9bb6c02322c7",
"title": "S230628ac - PRELIMINARY",
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"data": {
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"time_created": "2023-06-28T14:14:53Z",
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"published": "2023-06-28T14:14:54.816174Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-28T14:14:54.816198Z",
"modified": "2023-06-28T14:14:54.821541Z"
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],
"references": []
},
{
"event_id": "S230516a",
"sequences": [],
"references": [
{
"id": 713,
"topic": "gcn.circular",
"uuid": "89106aae-4f70-4126-9fd8-337768e1ea82",
"title": "LIGO/Virgo/KAGRA S230516az: GOTO candidate counterpart GOTO23hu ruled out by Zwicky Transient Facility observations",
"submitter": "Hop gcn.circular",
"authors": "Simeon Reusch at DESY <simeon.reusch@desy.de>",
"data": {
"date": "23/06/28 16:28:39 GMT",
"from": "Simeon Reusch at DESY <simeon.reusch@desy.de>",
"title": "GCN CIRCULAR",
"number": "34103",
"subject": "LIGO/Virgo/KAGRA S230516az: GOTO candidate counterpart GOTO23hu ruled out by Zwicky Transient Facility observations"
},
"message_text": "Simeon Reusch (DESY), Tomas Ahumada (CIT), Anirudh Salgundi (IITB), Gokul Srinivasaragavan (UMD), Michael Coughlin (UMN), Vishwajeet Swain (IITB), Theophile du Laz (CIT), Jacob Wise (LJMU), Shreya Anand (CIT), Igor Andreoni (UMD), Eric Bellm (UW), Varun Bhalerao (IITB), S. Bradley Cenko (NASA/GSFC), Brian Healy (UMN), Mansi Kasliwal (CIT), Viraj Karambelkar (CIT), D. Kaplan (UWM), Harsh Kumar (IITB), Jannis Necker (DESY), Daniel Perley (LJMU), Robert Stein (CIT), Avery Wold (CIT/IPAC) report on behalf of the ZTF and GROWTH collaborations:\n\nWe observed parts of the localization region of LVK trigger S230516az as part of routine Zwicky Transient Facility (ZTF; Graham et al., 2019; Bellm et al., 2019) survey operations prior to and after merger time.\n\nFollowing the GOTO GCN notice (Gompertz et al., 33979), we obtained forced photometry of GOTO23hu and detected the transient in the i-band with 20.14 mag (AB) at 2023-06-15 04:37:55 UT, roughly 13 hours prior to merger time. Furthermore, the transient has since then continued to brighten in the i- and g-band, rising 1.4 mag in the g-band within 4 days.\n\nWe thereby rule out GOTO23hu as potential counterpart to S230516az.\n\nZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC, USA, WIS, Israel; OKC, Sweden; JSI/UMd, USA; U Washington, USA; DESY, Germany; MOST, Taiwan; UW Milwaukee, USA; LANL USA; Tokyo Tech, Japan; IITB, India; IIA, India; LJMU, UK; TTU, USA; SDSU, USA and USyd, Australia. ZTF acknowledges the generous support of the NSF under AST MSIP Grant No 1440341. GROWTH acknowledges generous support of the NSF under PIRE Grant No 1545949. Alert distribution service provided by DIRAC@UW (Patterson et al. 2019). Alert database searches are done by AMPEL (Nordin et al. 2019) and Kowalski (Duev et al. 2019).\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg3OTY5NzI1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.zvcjMOp5KNeMR-Dt9V4uo1h_BL5xnkvy2dAk2QdYP0w\n\n",
"published": "2023-06-28T16:28:54.702530Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-28T16:28:54.702550Z",
"modified": "2023-06-28T16:28:54.709828Z",
"targets": []
}
]
},
{
"event_id": "S230628aj",
"sequences": [
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"sequence_number": 1,
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"message": {
"id": 716,
"topic": "igwn.gwalert",
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"title": "S230628aj - PRELIMINARY",
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"published": "2023-06-28T16:42:56.623438Z",
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"message": {
"id": 717,
"topic": "igwn.gwalert",
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"title": "S230628aj - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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},
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"published": "2023-06-28T16:47:31.224927Z",
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},
{
"event_id": "S230628a",
"sequences": [],
"references": [
{
"id": 729,
"topic": "gcn.circular",
"uuid": "f1297f26-82a9-40af-bfaf-db342e20ac8d",
"title": "LIGO/Virgo/KAGRA S230628ax: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "David Hui at Chungnam National University <huichungyue@gmail.com>",
"data": {
"date": "23/06/29 00:59:04 GMT",
"from": "David Hui at Chungnam National University <huichungyue@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34113",
"subject": "LIGO/Virgo/KAGRA S230628ax: 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 S230628ax during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-06-28 23:12:00.373 UTC (GPS\ntime: 1372029138.373). The candidate was found by the CWB [1], MBTA\n[2], GstLAL [3], PyCBC Live [4], and SPIIR [5] analysis pipelines.\n\nS230628ax 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/S230628ax\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 705\ndeg2. Marginalized over the whole sky, the a posteriori luminosity\ndistance estimate is 2047 +/- 585 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] Aubin et al. CQG 38, 095004 (2021)\n [3] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg4MDAwMzUwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.-81_-CTNMROvxIxh4bhRqDYJ99eobmqJUzHTXh3CYw8\n\n",
"published": "2023-06-29T00:59:15.532377Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-29T00:59:15.532396Z",
"modified": "2023-06-29T00:59:15.537510Z",
"targets": []
},
{
"id": 720,
"topic": "gcn.circular",
"uuid": "aae5007b-e77a-4db6-9bcc-9ad8aa35262e",
"title": "LIGO/Virgo/KAGRA low-significance gravitational wave candidate S230628aj: one counterpart neutrino candidate from IceCube neutrino searches",
"submitter": "Hop gcn.circular",
"authors": "acz2122@columbia.edu",
"data": {
"date": "23/06/28 18:26:22 GMT",
"from": "acz2122@columbia.edu",
"title": "GCN CIRCULAR",
"number": "34107",
"subject": "LIGO/Virgo/KAGRA low-significance gravitational wave candidate S230628aj: one counterpart neutrino candidate 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 S230628aj in a time range of 1000 seconds\ncentered on the alert event time (2023-06-28 16:34:04 UTC to 2023-06-28 16:50:44 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\nOne track-like event is found in spatial and temporal coincidence with the gravitational-wave\ncandidate S230628aj calculated from the map circulated by LVK as S230628aj-2-Preliminary. This\nrepresents an overall pre-trial p-value of 0.0080 for the Bayesian search. The most probable\nmulti-messenger source direction based on the neutrinos and GW skymap is RA 147.97, Dec 8.91 degrees.\n\nThe reported p-value here does not account for any trials correction (multiple hypotheses testing).\nThe false alarm rate of these coincidences can be obtained by multiplying the p-values with their\ncorresponding 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-----------------------------------------------------------------------------------------------------\n-301.0 147.97 \t8.91 \t1.509 \tnull (not applicable) \t0.0086\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\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---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg3OTc2Nzg4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.H1Z5oJEWu2Lj_OG2gpvp75gFpGZ6ZMgdUgV1t0FmJHw\n\n",
"published": "2023-06-28T18:26:33.410517Z",
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"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 S230630am (GCN Circular 34124). 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/S230630am\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 3965 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 5336 +/- 2001 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg4OTM1MzczLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Pvk2bupGjea2tOP4-hefRYSwQABf11It7bJdP3lT_uw\n\n",
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"subject": "LIGO/Virgo/KAGRA S230630am: 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 S230630am (GCN Circular 34124). 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/S230630am\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 3965 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 5336 +/- 2001 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg4OTM1MzQ4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.2Ob3VO784OOaleMUSgedSd18nE_XJicoTyQcops1pfU\n\n",
"published": "2023-07-09T20:42:33.279061Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-09T20:42:33.279084Z",
"modified": "2023-07-09T20:42:33.285688Z",
"targets": []
},
{
"id": 772,
"topic": "gcn.circular",
"uuid": "fcf43bfe-92ca-47e3-8adf-83e29dc3fe1b",
"title": "LIGO/Virgo/KAGRA S230630am: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "thomas.sainrat@iphc.cnrs.fr",
"data": {
"date": "23/06/30 13:33:07 GMT",
"from": "thomas.sainrat@iphc.cnrs.fr",
"title": "GCN CIRCULAR",
"number": "34124",
"subject": "LIGO/Virgo/KAGRA S230630am: 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 S230630am during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-06-30 12:58:06.902 UTC (GPS\ntime: 1372165104.902). The candidate was found by the CWB [1], MBTA\n[2], and GstLAL [3] analysis pipelines.\n\nS230630am is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 2.4e-08 Hz, or about one in 1\nyear, 3 months. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230630am\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (98%), Terrestrial (2%), 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%. [4] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [4] 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 [5], distributed via GCN notice about 32 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by\nBAYESTAR [5], 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\n3642 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 8710 +/- 2735 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] Aubin et al. CQG 38, 095004 (2021)\n [3] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [4] Chatterjee et al. ApJ 896, 54 (2020)\n [5] Singer & Price PRD 93, 024013 (2016)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg4MTMxOTkzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.h2yqDzZSBoMvwxqcDa8n0n0lKAxuC49jXqyNGnIXRbE\n\n",
"published": "2023-06-30T13:33:18.831213Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-06-30T13:33:18.831232Z",
"modified": "2023-06-30T13:33:18.836307Z",
"targets": []
}
]
},
{
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"message": {
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"title": "S230630bb - PRELIMINARY",
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"message": {
"id": 774,
"topic": "igwn.gwalert",
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"title": "S230630bb - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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},
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"message_parser": "IGWN Alert Avro Parser v1",
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"title": "S230630bd - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"event": {
"far": 9.739569955731392e-06,
"time": "2023-06-30T18:45:17.823Z",
"group": "CBC",
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"area_50": 361.5781935275358,
"area_90": 1470.8621132325702,
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"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-06-30T18:45:42Z",
"superevent_id": "S230630bd",
"external_coinc": null
},
"message_text": "",
"published": "2023-06-30T18:45:42.923005Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-30T18:45:42.923027Z",
"modified": "2023-06-30T18:45:42.928054Z"
}
},
{
"id": 353,
"sequence_number": 2,
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"message": {
"id": 777,
"topic": "igwn.gwalert",
"uuid": "5fb142f7-3238-46e3-aeb6-40fc0e80b5e9",
"title": "S230630bd - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"sequence_num": 2,
"time_created": "2023-06-30T18:50:16Z",
"superevent_id": "S230630bd",
"external_coinc": null
},
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"published": "2023-06-30T18:50:17.549211Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-06-30T18:50:17.549234Z",
"modified": "2023-06-30T18:50:17.554310Z"
}
}
],
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},
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"message": {
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"topic": "igwn.gwalert",
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"title": "S230630bo - PRELIMINARY",
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"time": "2023-06-30T23:33:05.788Z",
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"published": "2023-06-30T23:34:42.956800Z",
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"created": "2023-06-30T23:34:42.956828Z",
"modified": "2023-06-30T23:34:42.964168Z"
}
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"topic": "igwn.gwalert",
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"title": "S230630bo - PRELIMINARY",
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"published": "2023-06-30T23:39:19.460296Z",
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}
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},
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"message": {
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"topic": "igwn.gwalert",
"uuid": "7c22fc7e-7712-46cd-9008-746d294d9daf",
"title": "S230630bq - PRELIMINARY",
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}
},
{
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"message": {
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"topic": "igwn.gwalert",
"uuid": "06878535-4ff5-4434-95ed-97b0b61b1a19",
"title": "S230630bq - PRELIMINARY",
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"authors": "LVK",
"data": {
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"title": "S230630bq - INITIAL",
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},
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"published": "2023-07-01T00:21:57.288083Z",
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},
{
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"id": 947,
"topic": "igwn.gwalert",
"uuid": "a9c1074a-00ae-4ed9-8786-a1c0d75bfe8e",
"title": "S230630bq - UPDATE",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230630bq/files/bayestar.multiorder.fits,2",
"gracedb": "https://gracedb.ligo.org/superevents/S230630bq/view/"
},
"event": {
"far": 7.732377e-09,
"time": "2023-06-30T23:45:32.407Z",
"group": "CBC",
"search": "AllSky",
"area_50": 245.07374440166075,
"area_90": 1214.2480812092558,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.02976190476190476,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "8ec9c51d178ad8428023bbb09bf4370e",
"classification": {
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"BNS": 0.0,
"NSBH": 0.000828221,
"Terrestrial": 0.031110641
},
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"central_frequency": null
},
"alert_type": "UPDATE",
"sequence_num": 4,
"time_created": "2023-07-06T18:49:16Z",
"superevent_id": "S230630bq",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-06T18:49:17.333748Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-06T18:49:17.333794Z",
"modified": "2023-07-06T18:49:17.342023Z"
}
}
],
"references": []
},
{
"event_id": "S230630b",
"sequences": [],
"references": [
{
"id": 948,
"topic": "gcn.circular",
"uuid": "b36c350d-b815-4dc2-bbd2-68b064aa7b9d",
"title": "LIGO/Virgo/KAGRA S230630bq: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "jgolomb@caltech.edu",
"data": {
"date": "23/07/06 18:52:12 GMT",
"from": "jgolomb@caltech.edu",
"title": "GCN CIRCULAR",
"number": "34152",
"subject": "LIGO/Virgo/KAGRA S230630bq: Updated Sky localization"
},
"message_text": "We have conducted further analysis of the LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S230630bq (GCN Circular 34127). 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/S230630bq\n\nFor the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible region is 1215 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 999 +/- 286 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg4NjY5NTM3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Ng2uYUCr4D4RJxcloAODDlmCgoQG1nNfclRS9zfi_Gk\n\n",
"published": "2023-07-06T18:52:22.778106Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-06T18:52:22.778135Z",
"modified": "2023-07-06T18:52:22.784792Z",
"targets": []
},
{
"id": 788,
"topic": "gcn.circular",
"uuid": "133fc46e-dade-49f8-9a61-655caa013c25",
"title": "LIGO/Virgo/KAGRA S230630bq: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "David Hui at Chungnam National University <huichungyue@gmail.com>",
"data": {
"date": "23/07/01 00:55:44 GMT",
"from": "David Hui at Chungnam National University <huichungyue@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34127",
"subject": "LIGO/Virgo/KAGRA S230630bq: 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 S230630bq during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-06-30 23:45:32.407 UTC (GPS\ntime: 1372203950.407). The candidate was found by the MBTA [1], GstLAL\n[2], PyCBC Live [3], and SPIIR [4] analysis pipelines.\n\nS230630bq is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 7.7e-09 Hz, or about one in 4\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230630bq\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (97%), Terrestrial (3%), 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%. [5] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [5] 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 8%.\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 [6], distributed via GCN notice about 33 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by\nBAYESTAR [6], 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\n1976 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 1150 +/- 360 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] Aubin et al. CQG 38, 095004 (2021)\n [2] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [3] Dal Canton et al. ApJ 923, 254 (2021)\n [4] Chu et al. PRD 105, 024023 (2022)\n [5] Chatterjee et al. ApJ 896, 54 (2020)\n [6] Singer & Price PRD 93, 024013 (2016)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjg4MTcyOTQ5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Goh95sjdLZhivd1uguZn-QS3gWtDoEvEOGqAqjfpir0\n\n",
"published": "2023-07-01T00:55:54.732329Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-07-01T00:55:54.732349Z",
"modified": "2023-07-01T00:55:54.738553Z",
"targets": []
}
]
},
{
"event_id": "S230701k",
"sequences": [
{
"id": 359,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 790,
"topic": "igwn.gwalert",
"uuid": "0ab8e385-0050-4c16-a7b2-ed3d7daa551e",
"title": "S230701k - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230701k/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230701k/view/"
},
"event": {
"far": 1.699751373962499e-05,
"time": "2023-07-01T03:48:00.537Z",
"group": "CBC",
"search": "AllSky",
"area_50": 896.3656130855264,
"area_90": 3096.154257183995,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.2913514006032769,
"HasRemnant": 0.7114629178904378
},
"instruments": [
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"L1"
],
"significant": false,
"skymap_hash": "a3459970881276fb1beadb2c5d11b36f",
"classification": {
"BBH": 6.0943925368395865e-05,
"BNS": 0.002414904268207442,
"NSBH": 0.03782950178658724,
"Terrestrial": 0.9596946500198369
},
"skymap_version": 0,
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"sequence_num": 1,
"time_created": "2023-07-01T03:48:23Z",
"superevent_id": "S230701k",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-01T03:48:24.441092Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-01T03:48:24.441116Z",
"modified": "2023-07-01T03:48:24.447205Z"
}
},
{
"id": 360,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 791,
"topic": "igwn.gwalert",
"uuid": "172606a1-4205-4639-af5e-a35ba97d8d8e",
"title": "S230701k - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230701k/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230701k/view/"
},
"event": {
"far": 1.699751373962499e-05,
"time": "2023-07-01T03:48:00.537Z",
"group": "CBC",
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"area_50": 896.3656130855264,
"area_90": 3096.154257183995,
"duration": null,
"pipeline": "spiir",
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"significant": false,
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"BNS": 0.002414904268207442,
"NSBH": 0.03782950178658724,
"Terrestrial": 0.9596946500198369
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"skymap_version": 0,
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},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-07-01T03:52:57Z",
"superevent_id": "S230701k",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-01T03:52:58.982641Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-01T03:52:58.982666Z",
"modified": "2023-07-01T03:52:58.988888Z"
}
}
],
"references": []
},
{
"event_id": "S230701t",
"sequences": [
{
"id": 361,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 793,
"topic": "igwn.gwalert",
"uuid": "5137934b-cd83-4fe0-aae7-e0ae273ae2fb",
"title": "S230701t - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230701t/view/"
},
"event": {
"far": 1.66596e-05,
"time": "2023-07-01T05:09:03.672Z",
"group": "Burst",
"search": "BBH",
"area_50": 527.0764091926128,
"area_90": 1984.9294709244098,
"duration": 0.005195,
"pipeline": "CWB",
"properties": {},
"instruments": [
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],
"significant": false,
"skymap_hash": "722d60e547d399c2cfbcee2a33db2181",
"classification": {},
"skymap_version": 0,
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"time_created": "2023-07-01T05:10:14Z",
"superevent_id": "S230701t",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-01T05:10:15.030420Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-01T05:10:15.030442Z",
"modified": "2023-07-01T05:10:15.036533Z"
}
},
{
"id": 362,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 794,
"topic": "igwn.gwalert",
"uuid": "988e586e-af31-4a65-a2ed-466f72a9e0ee",
"title": "S230701t - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230701t/view/"
},
"event": {
"far": 1.66596e-05,
"time": "2023-07-01T05:09:03.672Z",
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"sequence_num": 2,
"time_created": "2023-07-01T05:14:48Z",
"superevent_id": "S230701t",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-01T05:14:49.541331Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-01T05:14:49.541354Z",
"modified": "2023-07-01T05:14:49.547122Z"
}
}
],
"references": []
},
{
"event_id": "S230701w",
"sequences": [
{
"id": 363,
"sequence_number": 1,
"sequence_type": "PRELIMINARY",
"message": {
"id": 796,
"topic": "igwn.gwalert",
"uuid": "ea578db4-434d-4fa7-9289-d79320b83a4c",
"title": "S230701w - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230701w/view/"
},
"event": {
"far": 1.086404872972796e-05,
"time": "2023-07-01T05:58:29.575Z",
"group": "CBC",
"search": "AllSky",
"area_50": 718.4353603007589,
"area_90": 2393.6654761422483,
"duration": null,
"pipeline": "pycbc",
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"HasMassGap": 0.23825404946282447,
"HasRemnant": 0.0
},
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"skymap_hash": "d8d681de888ba94fe4d231976aefdf1c",
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"NSBH": 0.0017082077285705155,
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"skymap_version": 0,
"central_frequency": null
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"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-07-01T05:58:53Z",
"superevent_id": "S230701w",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-01T05:58:54.638010Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-01T05:58:54.638036Z",
"modified": "2023-07-01T05:58:54.645283Z"
}
},
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"id": 364,
"sequence_number": 2,
"sequence_type": "PRELIMINARY",
"message": {
"id": 797,
"topic": "igwn.gwalert",
"uuid": "0b110d7b-f1c6-45b3-9d61-7b46ee368880",
"title": "S230701w - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"sequence_num": 2,
"time_created": "2023-07-01T06:03:28Z",
"superevent_id": "S230701w",
"external_coinc": null
},
"message_text": "",
"published": "2023-07-01T06:03:29.285263Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-07-01T06:03:29.285289Z",
"modified": "2023-07-01T06:03:29.290931Z"
}
}
],
"references": []
}
]
}