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{
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"topic": "gcn.circular",
"uuid": "42da3ea0-ee0f-4c79-bdd7-1780c63d5be0",
"title": "Swift GRB230824.58: 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": "23/08/24 14:10:32 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34536",
"subject": "Swift GRB230824.58: Global MASTER-Net observations report"
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"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-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the Swift GRB230824.58 (trigger No 1186959,17h 27m 45.84s , -16d 12m 54.0s, R=0.05) errorbox 72 sec after notice time and 188 sec after trigger time at 2023-08-24 14:02:52 UT, with upper limit up to 16.6 mag. Observations started at twilight. The observations began at zenith distance = 71 deg. The sun altitude is -15.9 deg.\n\nThe galactic latitude b = 10 deg., longitude l = 9 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"59621\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 208 | MASTER-Tunka | C | 40 | 16.6 |\n 209 | MASTER-Tunka | C | 40 | 15.6 |\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyODg2MjM3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.TB8kr-jwybAekgSgnM4xKstAG7LUp7jBjj9tsGwA_v4\n\n",
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"id": 2413,
"topic": "gcn.circular",
"uuid": "1b20d9e1-763e-41aa-b2bc-ab9cb9980554",
"title": "GRB 230824A: Swift detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"data": {
"date": "23/08/24 14:12:46 GMT",
"from": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34537",
"subject": "GRB 230824A: Swift detection of a burst"
},
"message_text": "\nK. L. Page (U Leicester), S. Dichiara (PSU), J.D. Gropp (PSU),\nH. A. Krimm (NSF), T. M. Parsotan (GSFC/UMBC/CRESSTII) and\nM. A. Williams (PSU) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nAt 13:59:44 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 230824A (trigger\u001186959).\nThe BAT on-board calculated location is\nRA, Dec 261.941, -16.215 which is\n RA(J2000) = 17h 27m 46s\n Dec(J2000) = -16d 12' 53\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including\nsystematic uncertainty). As is common for image triggers, the BAT\nlight curve does not show significant structure. The duration\nappears to be about 20 sec. The peak count rate was ~1400\ncounts/sec (15-350 keV), at ~6 sec after the trigger.\n\nDue to a Moon observing constraint, Swift cannot slew to the BAT\nposition until 09:35 UT on 2023 August 27. There will thus be no XRT or\nUVOT data for this trigger before this time.\n\nBurst Advocate for this burst is K. L. Page (klp5 AT leicester.ac.uk).\nPlease contact the BA by email if you require additional information\nregarding Swift followup of this burst. In extremely urgent cases, after\ntrying the Burst Advocate, you can contact the Swift PI by phone (see\nSwift TOO web site for information: http://www.swift.psu.edu/)\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyODg2MzY5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.0lI06gQIX0QpW0G94EhJvVtGby_cirEWtrp2hRDV97w\n\n",
"published": "2023-08-24T14:12:54.061884Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-24T14:12:54.061902Z",
"modified": "2023-08-24T14:12:54.065758Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2414,
"topic": "igwn.gwalert",
"uuid": "5a019df0-1224-4bb8-ac3b-2e3bfb717703",
"title": "S230824cd - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"event": {
"far": 2.10279e-05,
"time": "2023-08-24T16:57:30.074Z",
"group": "Burst",
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"time_created": "2023-08-24T16:59:16Z",
"superevent_id": "S230824cd",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-24T16:59:16.821285Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-24T16:59:16.821306Z",
"modified": "2023-08-24T16:59:16.827776Z",
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"targets": []
},
{
"id": 2415,
"topic": "igwn.gwalert",
"uuid": "f25adcd4-5fcd-45ee-8e83-668d21ad937a",
"title": "S230824cd - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230824cd/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230824cd/view/"
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"event": {
"far": 2.10279e-05,
"time": "2023-08-24T16:57:30.074Z",
"group": "Burst",
"search": "AllSky",
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"area_90": 4600.378292813709,
"duration": 0.01711,
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"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-24T17:03:49Z",
"superevent_id": "S230824cd",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-24T17:03:50.563323Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-24T17:03:50.563345Z",
"modified": "2023-08-24T17:03:50.567302Z",
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},
{
"id": 2416,
"topic": "gcn.circular",
"uuid": "be117eb7-a7dd-4eda-91b5-c71d7715114d",
"title": "GRB 230824B: AstroSat CZTI detection",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "23/08/24 17:21:58 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"title": "GCN CIRCULAR",
"number": "34538",
"subject": "GRB 230824B: AstroSat CZTI detection"
},
"message_text": "P. K. Navaneeth (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:\n\nAnalysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a GRB 230824B which was also detected by GECAM-B (Trigger Num. 214).\n\nThe source was clearly detected in the 20-200 keV energy range. The light curve peaks at 2023-08-24 02:26:50.45 UTC. We see at least two narrow distinct emission episodes. The measured peak count rate associated with the burst is 1044 (+201, -147) counts/s above the background in the combined data of all quadrants, with a total of 704 (+170, -185) counts. The local mean background count rate was 464 (+7, -9) counts/s. Using cumulative rates for the full burst, we measure a T90 of 4.0 (+1.5, -1.4) s.\n\nThe source was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2023-08-24 02:26:50.21 UTC. The measured peak count rate associated with the burst is 292 (+71, -46) counts/s above the background in the combined data of all quadrants, with a total of 824 (+293, -358) counts. The local mean background count rate was 1529 (+5, -5) counts/s. We measure a T90 of 5.9 (+3.7, - 3.9) s from the cumulative Veto light curve.\n\nCZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.\n\nCZTI GRB detections are reported regularly on the payload site at:\nhttp://astrosat.iucaa.in/czti/?q=grb\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyODk3NzI0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.So1KZDHCu_DhtxVhS7JsAFwiVN5_Bl-IVrYteSpScNQ\n\n",
"published": "2023-08-24T17:22:13.261804Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-24T17:22:13.261836Z",
"modified": "2023-08-24T17:22:13.271665Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2417,
"topic": "igwn.gwalert",
"uuid": "15c16dca-e8a9-44dc-875c-fb3cb7a377e1",
"title": "S230824cg - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"far": 8.700345007430539e-06,
"time": "2023-08-24T17:32:33.010Z",
"group": "CBC",
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"area_50": 1980.9428261096568,
"area_90": 8298.93556384802,
"duration": null,
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"sequence_num": 1,
"time_created": "2023-08-24T17:32:58Z",
"superevent_id": "S230824cg",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-24T17:32:59.752620Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-24T17:32:59.752656Z",
"modified": "2023-08-24T17:32:59.758416Z",
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},
{
"id": 2418,
"topic": "igwn.gwalert",
"uuid": "c0a3ef0b-bfbf-419b-a0c1-66f76e8c021a",
"title": "S230824cg - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230824cg/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230824cg/view/"
},
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"far": 1.818034700788458e-05,
"time": "2023-08-24T17:32:33.010Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1986.817881626135,
"area_90": 8285.50686552464,
"duration": null,
"pipeline": "gstlal",
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"BNS": 1.7242502400522339e-13,
"NSBH": 1.2914495770451355e-11,
"Terrestrial": 0.897697229284629
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},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-24T17:37:32Z",
"superevent_id": "S230824cg",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-24T17:37:34.095842Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-24T17:37:34.095876Z",
"modified": "2023-08-24T17:37:34.099753Z",
"nonlocalizedevents": [],
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},
{
"id": 2419,
"topic": "gcn.circular",
"uuid": "c4f50d45-2dc0-4835-945d-9591adce02db",
"title": "Integral GRB230824.72: 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": "23/08/24 17:38:29 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34539",
"subject": "Integral GRB230824.72: 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-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Integral GRB230824.72 (trigger No 10375,17h 27m 41.31s , -16d 11m 56.0s, R=0.0503333) errorbox 17 sec after notice time and 28 sec after trigger time at 2023-08-24 17:17:41 UT, with upper limit up to 16.5 mag. Observations started at twilight. The observations began at zenith distance = 60 deg. The sun altitude is -8.2 deg.\n\nThe galactic latitude b = 10 deg., longitude l = 9 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"59687\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 33 | MASTER-Tavrida | C | 10 | 14.9 |\n 50 | MASTER-Tavrida | C | 10 | 14.9 |\n 68 | MASTER-Tavrida | C | 10 | 14.9 |\n 90 | MASTER-Tavrida | C | 20 | 15.2 |\n 120 | MASTER-Tavrida | C | 20 | 15.2 |\n 153 | MASTER-Tavrida | C | 30 | 15.4 |\n 196 | MASTER-Tavrida | C | 40 | 15.6 |\n 244 | MASTER-Tavrida | C | 40 | 15.6 |\n 297 | MASTER-Tavrida | C | 50 | 15.7 |\n 364 | MASTER-Tavrida | C | 70 | 15.9 |\n 449 | MASTER-Tavrida | C | 80 | 16.1 |\n 550 | MASTER-Tavrida | C | 100 | 16.2 |\n 669 | MASTER-Tavrida | C | 120 | 16.3 |\n 812 | MASTER-Tavrida | C | 150 | 16.5 |\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyODk4NzE0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Gb70oQ4I6SXn0ckXP5-R8a7ZOtIWKgJVoAIzQGP2734\n\n",
"published": "2023-08-24T17:38:40.330215Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-24T17:38:40.330239Z",
"modified": "2023-08-24T17:38:40.334400Z",
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{
"id": 2420,
"topic": "igwn.gwalert",
"uuid": "325f7085-1b29-44a1-a555-aadf12a54909",
"title": "S230824cl - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"time": "2023-08-24T18:11:36.239Z",
"group": "CBC",
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"area_90": 3128.047415702019,
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"sequence_num": 1,
"time_created": "2023-08-24T18:11:57Z",
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},
"message_text": "",
"published": "2023-08-24T18:11:59.639592Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-24T18:11:59.639611Z",
"modified": "2023-08-24T18:11:59.645894Z",
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{
"id": 2421,
"topic": "igwn.gwalert",
"uuid": "1efb8554-eea5-4b5a-9ec3-1c5a625ddcd9",
"title": "S230824cl - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"time": "2023-08-24T18:11:36.239Z",
"group": "CBC",
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"area_50": 1015.1256638829066,
"area_90": 3128.047415702019,
"duration": null,
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"sequence_num": 2,
"time_created": "2023-08-24T18:16:32Z",
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},
"message_text": "",
"published": "2023-08-24T18:16:34.228979Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-24T18:16:34.229022Z",
"modified": "2023-08-24T18:16:34.232821Z",
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{
"id": 2422,
"topic": "igwn.gwalert",
"uuid": "7dcce6c2-c261-4341-b81f-e022c5a02571",
"title": "S230824co - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"sequence_num": 1,
"time_created": "2023-08-24T18:21:22Z",
"superevent_id": "S230824co",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-24T18:21:23.995861Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-24T18:21:23.995882Z",
"modified": "2023-08-24T18:21:23.999765Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2423,
"topic": "igwn.gwalert",
"uuid": "32683c16-8830-4078-8dfc-0336134cd091",
"title": "S230824co - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230824co/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230824co/view/"
},
"event": {
"far": 1.231066691588073e-05,
"time": "2023-08-24T18:20:52.916Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1017.0140745846317,
"area_90": 3907.751212103194,
"duration": null,
"pipeline": "pycbc",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.05584942834942835,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "9174c87402c600ebb5d250de674f195c",
"classification": {
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"NSBH": 0.0025153976607894288,
"Terrestrial": 0.9966273775227575
},
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"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-24T18:25:57Z",
"superevent_id": "S230824co",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-24T18:25:58.749789Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-24T18:25:58.749810Z",
"modified": "2023-08-24T18:25:58.753364Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2424,
"topic": "gcn.circular",
"uuid": "411afb6b-2c84-4e10-ae95-07b7e3378098",
"title": "GRB 230824A is likely a Galactic Transient: Swift J1727.8-1613",
"submitter": "Hop gcn.circular",
"authors": "Jamie Kennea at Penn State U <jak51@psu.edu>",
"data": {
"date": "23/08/24 18:57:10 GMT",
"from": "Jamie Kennea at Penn State U <jak51@psu.edu>",
"title": "GCN CIRCULAR",
"number": "34540",
"subject": "GRB 230824A is likely a Galactic Transient: Swift J1727.8-1613"
},
"message_text": "Jamie A. Kennea (PSU) reports on behalf of the Swift Team\n\nGRB 230824A (GCN #34537) reported by Swift/BAT, previously triggered INTEGRAL at 12:20UT (Weak trigger #10373,0) 100 mins before the BAT trigger, and continued to trigger INTEGRAL several times after the BAT trigger. Given this, and its location in the Galactic Bulge (l,b = 8.64, 10.241), we now believe this is a likely Galactic Transient and not a GRB.\n\nWe therefore rename this source Swift J1727.8-1613. Observations to confirm the nature of this transient are requested. Swift will not observe this transient until at least August 27, 2023 due to the proximity of the Moon.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyOTAzNDM1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.P2rhK8WAbcjQVoxZWZhmMljivQxvKHCrK7gjUBORr6w\n\n",
"published": "2023-08-24T18:57:21.788426Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-24T18:57:21.788444Z",
"modified": "2023-08-24T18:57:21.796666Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2425,
"topic": "gcn.circular",
"uuid": "9e8cd963-c275-4347-80e1-61d29993edf7",
"title": "IBAS trigger 10375 is not a GRB",
"submitter": "Hop gcn.circular",
"authors": "Diego Gotz at CEA <diego.gotz@cea.fr>",
"data": {
"date": "23/08/24 19:07:10 GMT",
"from": "Diego Gotz at CEA <diego.gotz@cea.fr>",
"title": "GCN CIRCULAR",
"number": "34541",
"subject": "IBAS trigger 10375 is not a GRB"
},
"message_text": "D. Gotz (CEA Saclay), E. Bozzo, C.Ferrigno, V. Savchenko (Uni Genève) and S. Mereghetti (INAF-IASF) report on behalf of the IBAS Team:\nThe IBAS Trigger 10375 is not due to a GRB, but most likely to a new galactic source, since previous weak triggers from the same direction have been detected starting at 12:20 UT, culminating in a series of more significant triggers between 17.17 and 18:18 UT on August 24th 2023. This conclusion is cohrent with the one presented by Kennea et al. (GCN 34540). \n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyOTA0MDM2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.RoDMGurOKDDxgc8ONi5InfCWmwE3m53HH_pHPTXckkg\n\n",
"published": "2023-08-24T19:07:21.328888Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-24T19:07:21.328905Z",
"modified": "2023-08-24T19:07:21.333755Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2426,
"topic": "gcn.circular",
"uuid": "c9dd7083-8bdd-4c8a-aa55-c79855ffb56a",
"title": "Trigger 1186982: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)",
"submitter": "Hop gcn.circular",
"authors": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"data": {
"date": "23/08/24 19:09:08 GMT",
"from": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34542",
"subject": "Trigger 1186982: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)"
},
"message_text": "\nS. Dichiara (PSU), J. A. Kennea (PSU), K. L. Page (U Leicester),\nT. M. Parsotan (GSFC/UMBC/CRESSTII) and M. A. Williams (PSU) report on\nbehalf of the Neil Gehrels Swift Observatory Team:\n\nAt 18:54:32 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated Swift J1727.8-1613. Due to a Moon observing constraint, Swift\ncannot observe this location until 09:35 UT on 2023 August 27.\n\nWe note this is the 2nd time BAT has triggered on this source,\npreviously named GRB 230824A (GCN #34537), now likely a Galactic\ntransient Swift J1727.8-1613 (GCN #34540)\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyOTA0MTUxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.N9HM2hGV_Ck9RPHmlrKyCpNyR2ibcm5_lCW90xhWq58\n\n",
"published": "2023-08-24T19:09:16.565432Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-24T19:09:16.565449Z",
"modified": "2023-08-24T19:09:16.569383Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2427,
"topic": "gcn.circular",
"uuid": "0ae75f4e-ebe1-4896-8169-3be9a4491f9d",
"title": "GRB 230824A: AKO Optical Afterglow Candidate",
"submitter": "Hop gcn.circular",
"authors": "Mohammad Odeh at Al Khatim Observatory M44 <mshodeh@gmail.com>",
"data": {
"date": "23/08/24 19:12:43 GMT",
"from": "Mohammad Odeh at Al Khatim Observatory M44 <mshodeh@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34543",
"subject": "GRB 230824A: AKO Optical Afterglow Candidate"
},
"message_text": "Mohammad Odeh, Osama Ghannam, Anas Mohammad, Khalfan Al-Noaimy, and Sameh\nAl-Ashi, report on behalf of Al-Khatim Observatory (AKO) operated by the\nInternational Astronomical Center in Abu Dhabi, UAE:\n\nWe observed the field of GRB 230824A (Page et al., GCN 34537; Navaneeth et\nal., GCN 34538) with our 0.36m f/7.7 robotic telescope. The observation\nstarted at 18:04 UT on 24 August 2023, 4.1 hours after the trigger.\n\nWe obtained multiple 180-sec exposures in R filter. We detected a bright\nstar with a magnitude of R\u0013.5 at:\nR.A. (J2000): 17:27:43.32\nDec. (J2000): -16:12:19.2\n\nWhich is within the uncertainty radius of the localization determined by\nSwift team (Page et al., GCN 34537), however, our detected object is a\ntransient object (AT 2023qql) which was discovered today at 14:37:22 (UT)\n0.6 hours after the GRB trigger, so more observations are required to\nconfirm this link.\nhttps://www.wis-tns.org/object/2023qql\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyOTA0MzY1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.fVfJ0aG3Ql9REEmifxEJtg_WwDqk3If4hWioSwBuu0Q\n\n",
"published": "2023-08-24T19:12:50.154122Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-24T19:12:50.154138Z",
"modified": "2023-08-24T19:12:50.159147Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2428,
"topic": "gcn.circular",
"uuid": "3e5572a1-03d2-4d49-82b2-a75d6ee135b7",
"title": "MAXI/GSC detection of Swift J1727.8-1613 (GRB 230824A)",
"submitter": "Hop gcn.circular",
"authors": "Motoko Serino at Aoyama Gakuin U. <serino@phys.aoyama.ac.jp>",
"data": {
"date": "23/08/25 02:25:47 GMT",
"from": "Motoko Serino at Aoyama Gakuin U. <serino@phys.aoyama.ac.jp>",
"title": "GCN CIRCULAR",
"number": "34544",
"subject": "MAXI/GSC detection of Swift J1727.8-1613 (GRB 230824A)"
},
"message_text": "H. Negoro (Nihon U.), M. Serino (AGU), M. Nakajima, K. Kobayashi, M. Tanaka, Y. Soejima, Y. Kudo (Nihon U.),\nT. Mihara, T. Kawamuro, S. Yamada, T. Tamagawa, N. Kawai, M. Matsuoka (RIKEN),\nT. Sakamoto, S. Sugita, H. Hiramatsu, H. Nishikawa, A. Yoshida (AGU),\nY. Tsuboi, S. Urabe, S. Nawa, N. Nemoto (Chuo U.), M. Shidatsu (Ehime U.),\nI. Takahashi, M. Niwano, S. Sato, N. Higuchi, Y. Yatsu (Tokyo Tech),\nS. Nakahira, S. Ueno, H. Tomida, M. Ishikawa, S. Ogawa, T. Kurihara (JAXA),\nY. Ueda, K. Setoguchi, T. Yoshitake, Y. Nakatani (Kyoto U.),\nM. Yamauchi, Y. Hagiwara, Y. Umeki, Y. Otsuki (Miyazaki U.),\nK. Yamaoka (Nagoya U.), Y. Kawakubo (LSU), M. Sugizaki (NAOC), and W. Iwakiri (Chiba U.)\nreport on behalf of the MAXI team:\n\n The MAXI/GSC has detected the hard X-ray transient Swift J1727.8-1613 (GRB 230824A:\nGCN #34536, #34537) since the scan transit at 10:20 on 2023 August 24.\nThe source flux is increasing rapidly, reaching more than 2 Crab at 10-20 keV at 21:10 and\n22:44, which supports the possibility that the source is a Galactic transient, not a GRB\n(GCN #23540).\n The hard and rapid variations suggest that the source is a V404 Cyg like object.\nFollowup observations are highly encouraged.\nWe cross-post this report to the ATel and the GCN.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyOTMwMzUyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.DCm9sQAB5JZvUfKXv7X4TNUKslwXgH9sOgUPCut1KgM\n\n",
"published": "2023-08-25T02:25:57.705806Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-25T02:25:57.705834Z",
"modified": "2023-08-25T02:25:57.714097Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2429,
"topic": "igwn.gwalert",
"uuid": "a3530928-a0b0-4f26-b71f-f4caddabab73",
"title": "S230825i - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230825i/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230825i/view/"
},
"event": {
"far": 2.14656e-05,
"time": "2023-08-25T03:45:55.469Z",
"group": "Burst",
"search": "AllSky",
"area_50": 311.7975891959485,
"area_90": 1450.2994189248966,
"duration": 0.003109,
"pipeline": "CWB",
"properties": {},
"instruments": [
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"L1"
],
"significant": false,
"skymap_hash": "924337734c6e47aeb4696de93e2345e7",
"classification": {},
"skymap_version": 0,
"central_frequency": 301.254578
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-25T03:47:46Z",
"superevent_id": "S230825i",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-25T03:47:48.069871Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-25T03:47:48.069893Z",
"modified": "2023-08-25T03:47:48.076197Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2430,
"topic": "igwn.gwalert",
"uuid": "5f18a610-93b2-44fa-9fdb-19bd7a5f755c",
"title": "S230825i - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230825i/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230825i/view/"
},
"event": {
"far": 2.14656e-05,
"time": "2023-08-25T03:45:55.469Z",
"group": "Burst",
"search": "AllSky",
"area_50": 311.7975891959485,
"area_90": 1450.2994189248966,
"duration": 0.003109,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "924337734c6e47aeb4696de93e2345e7",
"classification": {},
"skymap_version": 0,
"central_frequency": 301.254578
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-25T03:52:20Z",
"superevent_id": "S230825i",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-25T03:52:21.797713Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-25T03:52:21.797735Z",
"modified": "2023-08-25T03:52:21.801275Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2431,
"topic": "igwn.gwalert",
"uuid": "ed0a4f48-a88d-49a2-99ce-e3d8b5e79d56",
"title": "S230825k - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230825k/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230825k/view/"
},
"event": {
"far": 2.387521492236506e-09,
"time": "2023-08-25T04:13:34.546Z",
"group": "CBC",
"search": "AllSky",
"area_50": 833.2087662833861,
"area_90": 2935.009877303451,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.059442968908486146,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "39caae14e81320db5d066056ec9a5384",
"classification": {
"BBH": 0.9978452593333421,
"BNS": 4.404595818027344e-18,
"NSBH": 3.194325954971056e-16,
"Terrestrial": 0.002154740666657551
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-25T04:14:02Z",
"superevent_id": "S230825k",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-25T04:14:03.289885Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-25T04:14:03.289908Z",
"modified": "2023-08-25T04:14:03.296885Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2432,
"topic": "igwn.gwalert",
"uuid": "312f5a71-e8c9-4de7-a83c-7b070f5ad688",
"title": "S230825k - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230825k/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230825k/view/"
},
"event": {
"far": 2.387521492236506e-09,
"time": "2023-08-25T04:13:34.546Z",
"group": "CBC",
"search": "AllSky",
"area_50": 833.2087662833861,
"area_90": 2935.009877303451,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.059442968908486146,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "39caae14e81320db5d066056ec9a5384",
"classification": {
"BBH": 0.9978452593333421,
"BNS": 4.404595818027344e-18,
"NSBH": 3.194325954971056e-16,
"Terrestrial": 0.002154740666657551
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-25T04:18:38Z",
"superevent_id": "S230825k",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-25T04:18:40.000001Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-25T04:18:40.000025Z",
"modified": "2023-08-25T04:18:40.015433Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2433,
"topic": "gcn.circular",
"uuid": "03da46b3-4756-431f-a181-76d51851276c",
"title": "Fermi trigger No 714618399: 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": "23/08/25 04:30:33 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34545",
"subject": "Fermi trigger No 714618399: 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-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB230825.05 (trigger No 714618399,17h 24m 55.20s , -19d 43m 48.0s, R\u0012.63) errorbox 1064 sec after notice time and 1100 sec after trigger time at 2023-08-25 01:24:54 UT, with upper limit up to 16.7 mag. The observations began at zenith distance = 26 deg. The sun altitude is -41.4 deg.\n\nThe galactic latitude b = 8 deg., longitude l = 6 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"59903\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 1190 | 2023-08-25 01:24:54 | MASTER-OAFA | (17h 26m 18.35s , -16d 14m 30.6s) | C | 180 | 16.7 |\n 1190 | 2023-08-25 01:24:54 | MASTER-OAFA | (17h 26m 18.35s , -16d 14m 30.6s) | C | 180 | 16.7 |\n 1663 | 2023-08-25 01:32:47 | MASTER-OAFA | (17h 26m 11.69s , -16d 13m 01.9s) | C | 180 | 16.7 |\n 1663 | 2023-08-25 01:32:47 | MASTER-OAFA | (17h 26m 11.69s , -16d 13m 01.9s) | C | 180 | 16.7 |\n 9428 | 2023-08-25 03:42:12 | MASTER-OAFA | (17h 26m 08.89s , -16d 08m 39.9s) | C | 180 | 16.1 |\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyOTM3ODM4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.J_CKIlX-f7fhpDyL0qd99ZCv5jgepy0FirEO-86qI7U\n\n",
"published": "2023-08-25T04:30:47.598818Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-25T04:30:47.598838Z",
"modified": "2023-08-25T04:30:47.605834Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2434,
"topic": "igwn.gwalert",
"uuid": "9faede42-88da-4d27-a601-a657d4f43acc",
"title": "S230825k - INITIAL",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230825k/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230825k/view/"
},
"event": {
"far": 2.387521492236506e-09,
"time": "2023-08-25T04:13:34.546Z",
"group": "CBC",
"search": "AllSky",
"area_50": 833.2087662833861,
"area_90": 2935.009877303451,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.059442968908486146,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "39caae14e81320db5d066056ec9a5384",
"classification": {
"BBH": 0.9978452593333421,
"BNS": 4.404595818027344e-18,
"NSBH": 3.194325954971056e-16,
"Terrestrial": 0.002154740666657551
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "INITIAL",
"sequence_num": 3,
"time_created": "2023-08-25T06:34:40Z",
"superevent_id": "S230825k",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-25T06:34:42.163554Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-25T06:34:42.163576Z",
"modified": "2023-08-25T06:34:42.171346Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2435,
"topic": "gcn.circular",
"uuid": "a0146ee8-31b4-4f9e-a37d-ca50148b703b",
"title": "LIGO/Virgo/KAGRA S230825k: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Hajime Sotani at RIKEN <h.sotani@gmail.com>",
"data": {
"date": "23/08/25 06:42:29 GMT",
"from": "Hajime Sotani at RIKEN <h.sotani@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34546",
"subject": "LIGO/Virgo/KAGRA S230825k: 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 S230825k during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-08-25 04:13:34.546 UTC (GPS\ntime: 1376972032.546). The candidate was found by the CWB [1], GstLAL\n[2], and MBTA [3] analysis pipelines.\n\nS230825k is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 2.4e-09 Hz, or about one in 13\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230825k\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS\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%. [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 6%.\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 [5], distributed via GCN notice about 27 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,1, 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,1. For\nthe bayestar.multiorder.fits,1 sky map, the 90% credible region is\n2936 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 7075 +/- 2287 Mpc (a posteriori mean\n+/- standard deviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\nhttps://emfollow.docs.ligo.org/userguide/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n [2] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [3] Aubin et al. CQG 38, 095004 (2021)\n [4] Chatterjee et al. ApJ 896, 54 (2020)\n [5] 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyOTQ1NzU0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.7Z7dyZ6qrvT8ZhZj2_ux9FLb2seBDrfVZRcSKxVkYg0\n\n",
"published": "2023-08-25T06:42:43.298876Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-25T06:42:43.298893Z",
"modified": "2023-08-25T06:42:43.302920Z",
"nonlocalizedevents": [
{
"event_id": "S230825k"
}
],
"targets": []
},
{
"id": 2436,
"topic": "igwn.gwalert",
"uuid": "ab358c2b-2ce6-4dae-a97f-12ad53babbc5",
"title": "S230825v - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230825v/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230825v/view/"
},
"event": {
"far": 2.057806705124676e-05,
"time": "2023-08-25T06:57:59.566Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1456.3842978526777,
"area_90": 4426.434684843694,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 7.257992696165029e-05,
"HasMassGap": 0.21789430168361534,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "573c3d042878234194253af5f70cd922",
"classification": {
"BBH": 0.07708125084669465,
"BNS": 0.0,
"NSBH": 0.011091901025788914,
"Terrestrial": 0.9118268481275165
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-25T06:58:23Z",
"superevent_id": "S230825v",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-25T06:58:24.425255Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-25T06:58:24.425277Z",
"modified": "2023-08-25T06:58:24.432765Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2437,
"topic": "igwn.gwalert",
"uuid": "546fc264-a1b3-4f0b-9910-e38410a22c15",
"title": "S230825v - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230825v/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230825v/view/"
},
"event": {
"far": 2.057806705124676e-05,
"time": "2023-08-25T06:57:59.566Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1456.3842978526777,
"area_90": 4426.434684843694,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 7.257992696165029e-05,
"HasMassGap": 0.21789430168361534,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "573c3d042878234194253af5f70cd922",
"classification": {
"BBH": 0.07708125084669465,
"BNS": 0.0,
"NSBH": 0.011091901025788914,
"Terrestrial": 0.9118268481275165
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-25T07:02:58Z",
"superevent_id": "S230825v",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-25T07:02:59.156399Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-25T07:02:59.156420Z",
"modified": "2023-08-25T07:02:59.160802Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2438,
"topic": "gcn.circular",
"uuid": "0adbc3c1-6580-41bc-8f44-6a3e95f1613b",
"title": "Trigger 1187142: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)",
"submitter": "Hop gcn.circular",
"authors": "P.A. Evans at U. Leicester <pae9@leicester.ac.uk>",
"data": {
"date": "23/08/25 09:16:38 GMT",
"from": "P.A. Evans at U. Leicester <pae9@leicester.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34547",
"subject": "Trigger 1187142: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)"
},
"message_text": "\nS. Dichiara (PSU), P. A. Evans (U Leicester) and\nK. L. Page (U Leicester) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nAt 09:03:36 UT, the Swift Burst Alert Telescope (BAT) triggered and located\nSwift J1727.8-1613 (trigger number 1187142); this is the third BAT trigger on\nthis event (GCN Circ. 34537; GCN Circ. 34542) which remains unobservable with\nXRT and UVOT until 09:35 UT on 2023 August 27; however, MAXI have reported a\nvery bright (>2 Crab) 10-20 keV X-ray counterpart. This object is believed to be\na Galactic transient, Swift J1727.8-1613 (GCN Circ. 34540).\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyOTU1MDAzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.JCHzXGxe9BJlluHm0owlzk2c7JJcdtAdeHi_91h_5SA\n\n",
"published": "2023-08-25T09:16:48.804189Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-25T09:16:48.804225Z",
"modified": "2023-08-25T09:16:48.816248Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2439,
"topic": "igwn.gwalert",
"uuid": "6810b94b-1c0f-43fe-867a-cfe66f5c9e98",
"title": "S230825aq - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230825aq/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230825aq/view/"
},
"event": {
"far": 3.50595e-07,
"time": "2023-08-25T11:31:24.207Z",
"group": "Burst",
"search": "BBH",
"area_50": 1244.6724758481607,
"area_90": 3789.410808128419,
"duration": 0.006256,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "042d5b362c26f5ae2f09d310b5700361",
"classification": {},
"skymap_version": 0,
"central_frequency": 116.59375
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-25T11:32:34Z",
"superevent_id": "S230825aq",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-25T11:32:35.849094Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-25T11:32:35.849117Z",
"modified": "2023-08-25T11:32:35.857494Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2440,
"topic": "igwn.gwalert",
"uuid": "2cec9f5f-cf89-4c47-bc50-3e1cfd1cfe90",
"title": "S230825aq - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230825aq/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230825aq/view/"
},
"event": {
"far": 3.50595e-07,
"time": "2023-08-25T11:31:24.207Z",
"group": "Burst",
"search": "BBH",
"area_50": 1244.6724758481607,
"area_90": 3789.410808128419,
"duration": 0.006256,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "042d5b362c26f5ae2f09d310b5700361",
"classification": {},
"skymap_version": 0,
"central_frequency": 116.59375
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-25T11:37:08Z",
"superevent_id": "S230825aq",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-25T11:37:08.812020Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-25T11:37:08.812042Z",
"modified": "2023-08-25T11:37:08.816599Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2441,
"topic": "igwn.gwalert",
"uuid": "c4c069e6-899d-4f1d-963a-b9c9b83c7a6b",
"title": "S230825k - UPDATE",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230825k/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230825k/view/"
},
"event": {
"far": 2.387521492236506e-09,
"time": "2023-08-25T04:13:34.546Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1002.3264357934361,
"area_90": 3011.385599017667,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "3d45054d1395d0cb10122fd264cf7819",
"classification": {
"BBH": 0.9978452593333421,
"BNS": 4.404595818027344e-18,
"NSBH": 3.194325954971056e-16,
"Terrestrial": 0.002154740666657551
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "UPDATE",
"sequence_num": 4,
"time_created": "2023-08-25T12:36:39Z",
"superevent_id": "S230825k",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-25T12:36:40.660117Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-25T12:36:40.660138Z",
"modified": "2023-08-25T12:36:40.667253Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2442,
"topic": "gcn.circular",
"uuid": "d06ddad6-a1fb-4eb0-b07c-6ef1fc8d0b4d",
"title": "LIGO/Virgo/KAGRA S230825k: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "Michael J. Williams at University of Glasgow <michael.williams@ligo.org>",
"data": {
"date": "23/08/25 12:45:11 GMT",
"from": "Michael J. Williams at University of Glasgow <michael.williams@ligo.org>",
"title": "GCN CIRCULAR",
"number": "34548",
"subject": "LIGO/Virgo/KAGRA S230825k: 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 S230825k (GCN Circular 34546). 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/S230825k\n\nFor the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible region is 3012 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 5283 +/- 2117 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyOTY3NTE2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.dyxBsDNTSAcZm7bdC78cgkdnUJRgwnCjyskf2KoX_6o\n\n",
"published": "2023-08-25T12:45:21.878369Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-25T12:45:21.878407Z",
"modified": "2023-08-25T12:45:21.887760Z",
"nonlocalizedevents": [
{
"event_id": "S230825k"
}
],
"targets": []
},
{
"id": 2443,
"topic": "igwn.gwalert",
"uuid": "7aea1ca8-b7c5-498e-bcc8-8f4e2e43b748",
"title": "S230825bf - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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{
"id": 2444,
"topic": "igwn.gwalert",
"uuid": "9168ffa1-8423-4991-89eb-6af5f2e0ba22",
"title": "S230825bf - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"event": {
"far": 2.490965698598302e-06,
"time": "2023-08-25T13:34:13.290Z",
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"sequence_num": 2,
"time_created": "2023-08-25T13:39:13Z",
"superevent_id": "S230825bf",
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},
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"published": "2023-08-25T13:39:15.091082Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-25T13:39:15.091104Z",
"modified": "2023-08-25T13:39:15.094796Z",
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},
{
"id": 2445,
"topic": "gcn.circular",
"uuid": "a89e6856-6d77-404e-9881-4f2731bcd92d",
"title": "NICER detection of Swift J1727.8-1613 (GRB 230824A)",
"submitter": "Hop gcn.circular",
"authors": "Brendan O'Connor at UMD <oconnorb@umd.edu>",
"data": {
"date": "23/08/25 17:08:08 GMT",
"from": "Brendan O'Connor at UMD <oconnorb@umd.edu>",
"title": "GCN CIRCULAR",
"number": "34549",
"subject": "NICER detection of Swift J1727.8-1613 (GRB 230824A)"
},
"message_text": "Brendan O'Connor (Carnegie Mellon University), Jeremy Hare (NASA/GSFC/CRESST/CUA), George Younes (NASA/GSFC), Keith Gendreau (NASA/GSFC), Zaven Arzoumanian (NASA/GSFC), Elizabeth Ferrara (NASA/GSFC/CRESST/UMCP):\n\nFollowing reports of repeated bursts from Swift J1727.8-1613 (GCN #34540) â initially designated GRB 230824A (GCN #34536, GCN #34537; see also ATels #16205, #16206) â we have observed the source with a NICER ToO, prior to the telescope entering a Moon constraint. The observation started on 2023-08-25 at 00:25:40 UT and ended at 00:49:53 UT, with a total exposure of 1,055 s. \n\nThe observation began during orbit-day, which, due to the high count rate and a recent light âleakâ in NICERâs X-ray Timing Instrument, led to telemetry saturation that created fragmented good-time intervals (GTIs). This is a known issue that leads to a 55 Hz âsignalâ (and potentially other significant features) in a power-spectral analysis. We caution future observers against astrophysical interpretations of this signal. To minimize calibration complications due to visible-light loading, we restricted our spectral analysis to only the nighttime data, with an exposure of 198 s.\n\nThroughout the observation, the source is prominently detected with a count rate varying between ~5,000 and 20,000 cts/s. Rapid (timescales less than one second) variability is observed, similar to the black-hole system V404 Cyg (ATel #16205, ATel #16206) and/or the neutron-star binary Swift J1858.6â0814 (ATel #12158). In the orbit-night-only data, the 55 Hz signal is no longer visible in power spectra, which lack narrow features (no obvious QPO or sharply periodic signal) but are dominated by a strong red-noise component. \n\nWe modeled the time-averaged spectrum (0.5-10 keV) with an absorbed power-law model plus a blackbody. We derive a photon index of 1.47+/-0.01, blackbody temperature of kT = 0.269+/-0.006 keV, and hydrogen column density of N_H = (2.26+/-0.05)e21 cm^-2. The PL+BB model fits the data well with a chi-squared of 87 for 155 degrees of freedom. We identify a hint of an iron line at around 6.4 keV. The absorption-corrected X-ray flux in the 0.5-10 keV energy band is (5.34+/-0.02)e-8 erg/cm^2/s. Assuming a distance of 3 - 6 kpc this corresponds to an X-ray luminosity of ~5e37 to 2e38 erg/s, which suggests that this is a newly discovered X-ray binary in outburst (ATel #16205, GCN #34540).\n\nFurther analysis is ongoing and additional NICER observations are planned. \n\nNICER is a 0.2-12 keV X-ray telescope operating on the International Space Station. The NICER mission and portions of the NICER science team activities are funded by NASA.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyOTgzMjk0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.tiIEu1yeqVrgOJPQ89MQKPokj0ydkoQjHOroZFbgvF4\n\n",
"published": "2023-08-25T17:08:23.927623Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-25T17:08:23.927646Z",
"modified": "2023-08-25T17:08:23.935684Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2446,
"topic": "gcn.circular",
"uuid": "aee558e7-8662-4fd9-a2f5-e1510a745fbd",
"title": "Fermi Gamma-ray Burst Monitor trigger 714618399/230825046 is not a GRB",
"submitter": "Hop gcn.circular",
"authors": "sumanbala2210@gmail.com",
"data": {
"date": "23/08/25 17:10:02 GMT",
"from": "sumanbala2210@gmail.com",
"title": "GCN CIRCULAR",
"number": "34550",
"subject": "Fermi Gamma-ray Burst Monitor trigger 714618399/230825046 is not a GRB"
},
"message_text": "S. Bala (USRA) and S. Lesage (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"The Fermi Gamma-ray Burst Monitor (GBM) trigger 714618399/230825046 at\n01:06:34.33 UT on 25 August 2023, tentatively classified as a GRB, is in fact\nnot due to a GRB. This trigger is likely due to Swift J1727.8-1613, which occurs\ncontemporaneously with a solar flare.\"\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyOTgzNDA1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.SojMA4r0eE1kP4UfoBNc_75PdJWdlELA5y-OWDelSF0\n\n",
"published": "2023-08-25T17:10:10.402371Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-25T17:10:10.402398Z",
"modified": "2023-08-25T17:10:10.408197Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2447,
"topic": "igwn.gwalert",
"uuid": "7944fd62-c6be-4f56-a58a-10c883a62666",
"title": "S230825bz - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"time": "2023-08-25T17:40:26.587Z",
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"duration": null,
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"time_created": "2023-08-25T17:40:50Z",
"superevent_id": "S230825bz",
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},
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"published": "2023-08-25T17:40:52.147236Z",
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"retracted": false,
"created": "2023-08-25T17:40:52.147258Z",
"modified": "2023-08-25T17:40:52.154764Z",
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{
"id": 2448,
"topic": "igwn.gwalert",
"uuid": "96f38097-ff7b-447c-83d5-78cd434fdaa6",
"title": "S230825bz - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"sequence_num": 2,
"time_created": "2023-08-25T17:45:24Z",
"superevent_id": "S230825bz",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-25T17:45:25.974995Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-25T17:45:25.975027Z",
"modified": "2023-08-25T17:45:25.978808Z",
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},
{
"id": 2449,
"topic": "igwn.gwalert",
"uuid": "c12d7fe1-f986-4787-b5d5-210b6a089fac",
"title": "S230825cb - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230825cb/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230825cb/view/"
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"event": {
"far": 2.10302871104096e-05,
"time": "2023-08-25T18:05:40.311Z",
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"sequence_num": 1,
"time_created": "2023-08-25T18:06:04Z",
"superevent_id": "S230825cb",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-25T18:06:06.071267Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-25T18:06:06.071289Z",
"modified": "2023-08-25T18:06:06.079168Z",
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},
{
"id": 2450,
"topic": "igwn.gwalert",
"uuid": "3d2f37aa-59a8-4a3f-b3c1-2e0144b2a7d0",
"title": "S230825cc - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230825cc/view/"
},
"event": {
"far": 6.82809e-06,
"time": "2023-08-25T18:07:28.953Z",
"group": "Burst",
"search": "BBH",
"area_50": 1059.1885802564927,
"area_90": 3939.644370621217,
"duration": 0.016575,
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"time_created": "2023-08-25T18:08:33Z",
"superevent_id": "S230825cc",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-25T18:08:34.403506Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-25T18:08:34.403528Z",
"modified": "2023-08-25T18:08:34.407022Z",
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},
{
"id": 2451,
"topic": "igwn.gwalert",
"uuid": "241a2c34-6cde-42db-95a0-429454b15d90",
"title": "S230825cd - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230825cd/view/"
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"far": 1.80901e-05,
"time": "2023-08-25T18:07:28.908Z",
"group": "Burst",
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"area_50": 1130.528540099442,
"area_90": 4588.418358369449,
"duration": 0.014356,
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"sequence_num": 1,
"time_created": "2023-08-25T18:09:12Z",
"superevent_id": "S230825cd",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-25T18:09:13.504171Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-25T18:09:13.504193Z",
"modified": "2023-08-25T18:09:13.508398Z",
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},
{
"id": 2452,
"topic": "igwn.gwalert",
"uuid": "fed40d16-ff26-457f-b8b6-e5988993d81f",
"title": "S230825cb - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230825cb/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230825cb/view/"
},
"event": {
"far": 2.10302871104096e-05,
"time": "2023-08-25T18:05:40.311Z",
"group": "CBC",
"search": "AllSky",
"area_50": 377.00021425829107,
"area_90": 1363.8521734681462,
"duration": null,
"pipeline": "pycbc",
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},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-25T18:10:38Z",
"superevent_id": "S230825cb",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-25T18:10:40.224747Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-25T18:10:40.224787Z",
"modified": "2023-08-25T18:10:40.234735Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2453,
"topic": "gcn.circular",
"uuid": "6b147f7e-cb38-47c2-9f26-3f0ff44a3736",
"title": "Swift Trigger 1187199 is not an astrophysical event",
"submitter": "Hop gcn.circular",
"authors": "David Palmer at LANL <palmer@lanl.gov>",
"data": {
"date": "23/08/25 18:11:44 GMT",
"from": "David Palmer at LANL <palmer@lanl.gov>",
"title": "GCN CIRCULAR",
"number": "34551",
"subject": "Swift Trigger 1187199 is not an astrophysical event"
},
"message_text": "\nS. Dichiara (PSU), D. M. Palmer (LANL) and\nT. M. Parsotan (GSFC/UMBC/CRESSTII) report on behalf of the Neil\nGehrels Swift Observatory Team:\n\nSwift Trigger 1187199 (2023-08-25 17:59:36 UT) is not an astrophysical event.\nIt is a spurious trigger due to a misidentification of the Crab during\na star tracker Loss-of-Lock event.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyOTg3MTA5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.JwzttCGSY4q45ENeBw6dTRThXaLvrgh3h8grHw5T8s0\n\n",
"published": "2023-08-25T18:11:55.454361Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-25T18:11:55.454380Z",
"modified": "2023-08-25T18:11:55.458621Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2454,
"topic": "igwn.gwalert",
"uuid": "fa358f05-7a09-4aa6-aed5-58f7b0f5e073",
"title": "S230825cc - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"time": "2023-08-25T18:07:28.953Z",
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"external_coinc": null
},
"message_text": "",
"published": "2023-08-25T18:13:08.613304Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-25T18:13:08.613326Z",
"modified": "2023-08-25T18:13:08.617148Z",
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{
"id": 2455,
"topic": "igwn.gwalert",
"uuid": "32b789d0-c7c1-4409-983b-f710ac2cf7f9",
"title": "S230825cd - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"event": {
"far": 1.80901e-05,
"time": "2023-08-25T18:07:28.908Z",
"group": "Burst",
"search": "AllSky",
"area_50": 1130.528540099442,
"area_90": 4588.418358369449,
"duration": 0.014356,
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"sequence_num": 2,
"time_created": "2023-08-25T18:13:46Z",
"superevent_id": "S230825cd",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-25T18:13:47.729976Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-25T18:13:47.730007Z",
"modified": "2023-08-25T18:13:47.733686Z",
"nonlocalizedevents": [],
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},
{
"id": 2456,
"topic": "gcn.circular",
"uuid": "e9be923e-f343-4804-b64d-47c1d80f6362",
"title": "GRB 230812B: radio detection with the VLA",
"submitter": "Hop gcn.circular",
"authors": "Stefano Giarratana at University of Bologna <s.giarratana@ira.inaf.it>",
"data": {
"date": "23/08/25 18:17:37 GMT",
"from": "Stefano Giarratana at University of Bologna <s.giarratana@ira.inaf.it>",
"title": "GCN CIRCULAR",
"number": "34552",
"subject": "GRB 230812B: radio detection with the VLA"
},
"message_text": "S. Giarratana (University of Bologna, INAF-IRA), M. Giroletti\n(INAF-IRA), G. Ghirlanda (INAF-OAB), N. Di Lalla (Stanford Univ.),\nN. Omodei (Stanford Univ.)\n\nAt 01:52:24 UT on 2023 August 15 (T_mid = 2.3 days post-burst) the\nKarl G. Jansky VLA observed the field of GRB 230812B (Fermi GBM\nteam, GCN 34386) at a central frequency of 6 and 10 GHz.\n\nThe standard J1331+3030 was used as bandpass and flux density\ncalibrator, while J1637+4717 was used as phase calibrator.\n\nFrom a preliminary analysis, an unresolved radio source (Rhodes et al.,\nGCN 34433; de Ugarte Postigo et al., GCN 34468) is clearly detected\nat both frequencies at a position:\n\nRA: 16:36:31.477 +- 0.001\nDec: +47:51:32.25 +- 0.02\n\nThe surface brightness peak is 230 uJy/beam and 196 uJy/beam at 6\nand 10 GHz, respectively. The r.m.s. noise level of the images is\n10 uJy/beam and 7 uJy/beam at 6 and 10 GHz, respectively.\nThe synthesized beams are 0.31 x 0.26 arcsec (PA: -45deg) at 6 GHz\nand 0.20 x 0.16 arcsec (PA: -45deg) at 10 GHz.\n\nWe would like to thank the staff of the VLA for approving, executing,\nand processing the observations.\n\nThe National Radio Astronomy Observatory is a facility of the National\nScience Foundation operated under cooperative agreement by Associated\nUniversities, Inc.\n\nThese observations were carried out as part of project SF161095,\napproved in the framework of the Fermi - NRAO joint program agreement.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyOTg3NDYzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.XG2idpXU7IaviFot1rcRw2S8eKGZTvkLfpQPb6c1uz0\n\n",
"published": "2023-08-25T18:17:48.610627Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-25T18:17:48.610646Z",
"modified": "2023-08-25T18:17:48.616387Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2457,
"topic": "igwn.gwalert",
"uuid": "8f41c090-0f91-44d9-83d3-76560ea2722a",
"title": "S230825ce - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"event": {
"far": 1.920501017593779e-05,
"time": "2023-08-25T18:25:13.651Z",
"group": "CBC",
"search": "AllSky",
"area_50": 2094.0376448018615,
"area_90": 7137.353158875765,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 0.28471585986648706,
"HasMassGap": 0.22899012820164955,
"HasRemnant": 0.0
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"skymap_hash": "0cbf005df31ba5b79d4c323a46680d03",
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"BBH": 0.06504110902111694,
"BNS": 0.0,
"NSBH": 0.026722418291166547,
"Terrestrial": 0.9082364726877165
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"sequence_num": 1,
"time_created": "2023-08-25T18:25:37Z",
"superevent_id": "S230825ce",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-25T18:25:39.124949Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-25T18:25:39.124983Z",
"modified": "2023-08-25T18:25:39.133790Z",
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},
{
"id": 2458,
"topic": "igwn.gwalert",
"uuid": "12f08d78-addc-4ce5-9199-b5bd02699679",
"title": "S230825ce - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"event": {
"far": 1.920501017593779e-05,
"time": "2023-08-25T18:25:13.651Z",
"group": "CBC",
"search": "AllSky",
"area_50": 2094.0376448018615,
"area_90": 7137.353158875765,
"duration": null,
"pipeline": "spiir",
"properties": {
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"NSBH": 0.026722418291166547,
"Terrestrial": 0.9082364726877165
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"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-25T18:30:12Z",
"superevent_id": "S230825ce",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-25T18:30:14.036756Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-25T18:30:14.036778Z",
"modified": "2023-08-25T18:30:14.040508Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2459,
"topic": "gcn.circular",
"uuid": "333b89b0-d724-4708-a566-2a4cd782c44f",
"title": "Swift GRB230825.75: 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": "23/08/25 20:06:45 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34553",
"subject": "Swift GRB230825.75: 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-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the Swift GRB230825.75 (trigger No 1187199,05h 35m 29.33s , +22d 12m 52.2s, R=0.05) errorbox 6363 sec after notice time and 6496 sec after trigger time at 2023-08-25 19:47:52 UT, with upper limit up to 16.1 mag. The observations began at zenith distance = 61 deg. The sun altitude is -19.3 deg.\n\nThe galactic latitude b = -5 deg., longitude l = 185 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"60242\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 6541 | MASTER-Tunka | C | 90 | 16.1 |\n 6542 | MASTER-Tunka | C | 90 | 15.5 |\n 6654 | MASTER-Tunka | C | 90 | 15.4 |\n 6654 | MASTER-Tunka | C | 90 | 15.1 |\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyOTk0MDEwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.VA7Wzl4l6DeK3KXOoCK_zIFeJk8Es3FUdtv5EQ8XRTQ\n\n",
"published": "2023-08-25T20:06:55.563064Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-25T20:06:55.563085Z",
"modified": "2023-08-25T20:06:55.570888Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2460,
"topic": "gcn.circular",
"uuid": "2e4c2ecf-55b8-431c-85ab-08bcc42e69ec",
"title": "Trigger 1187203: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)",
"submitter": "Hop gcn.circular",
"authors": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"data": {
"date": "23/08/25 20:33:01 GMT",
"from": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34554",
"subject": "Trigger 1187203: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)"
},
"message_text": "\nS. Dichiara (PSU), N. J. Klingler (GSFC/UMBC/CRESSTII),\nM. J. Moss (GWU) and K. L. Page (U Leicester) report on behalf of the\nNeil Gehrels Swift Observatory Team:\n\nAt 20:20:32 UT, the Swift Burst Alert Telescope (BAT) triggered again\non the Galactic transient Swift J1727.8-1613 (trigger number\n1187203); this is the fourth BAT trigger on this event (GCN Circ.\n34537, 34542 and 34547). Swift XRT and UVOT observations are planned\nfor after the source exits Moon constraint on August 27.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyOTk1NTg3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.1Ixy9zR3V_gqfgAY8lFl7VvIoGyDsmRYCQEwjfO--v8\n\n",
"published": "2023-08-25T20:33:13.514730Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-25T20:33:13.514761Z",
"modified": "2023-08-25T20:33:13.523718Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2461,
"topic": "gcn.circular",
"uuid": "d6381e79-3a44-4148-a15d-18f6dd873e69",
"title": "Trigger 1187207: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)",
"submitter": "Hop gcn.circular",
"authors": "Simone Dichiara at Pennsylvania State University <sbd5667@psu.edu>",
"data": {
"date": "23/08/25 21:05:28 GMT",
"from": "Simone Dichiara at Pennsylvania State University <sbd5667@psu.edu>",
"title": "GCN CIRCULAR",
"number": "34555",
"subject": "Trigger 1187207: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)"
},
"message_text": "\nS. Dichiara (PSU) and T. M. Parsotan (GSFC/UMBC/CRESSTII) report on\nbehalf of the Neil Gehrels Swift Observatory Team:\n\n\n\nAt 20:27:20 UT, the Swift Burst Alert Telescope (BAT) triggered again\non the Galactic transient Swift J1727.8-1613 (AKA GRB 230824A) (trigger number\n1187203); this is the fourth BAT trigger on this event (GCN Circ.\n34537, 34542 and 34547). Swift XRT and UVOT observations are planned\nfor after the source exits Moon constraint on August 27.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyOTk3NTM0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.VLIql0I4GnANmcqZHJ2A4CHA9flDKbaD6Si7qN9uF10\n\n",
"published": "2023-08-25T21:05:39.504222Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-25T21:05:39.504244Z",
"modified": "2023-08-25T21:05:39.511833Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2462,
"topic": "gcn.circular",
"uuid": "8106983b-0e94-47fc-b4d4-08a713304832",
"title": "Swift J1727.8-1613 (GRB 230824A): Skynet Optical Observations",
"submitter": "Hop gcn.circular",
"authors": "Dylan Dutton at UNC Chapel Hill <ddutton59@gmail.com>",
"data": {
"date": "23/08/25 21:25:27 GMT",
"from": "Dylan Dutton at UNC Chapel Hill <ddutton59@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34556",
"subject": "Swift J1727.8-1613 (GRB 230824A): Skynet Optical Observations"
},
"message_text": "Dylan Dutton, Daniel Reichart, Joshua Haislip, Vladimir Kouprianov, Daryl Janzen, Arie Verveer, John Kennewell, Megan Dubay, Ruide Fu, Logan Selph, and Donovan Schlekat report on behalf of the Skynet Robotic Telescope Network at the University of North Carolina at Chapel Hill.\n\nWe observed the field of Swift J1727.8-1613 (GRB 230824A) (Page et al., GCN 34537; Navaneeth et al., GCN 34538, Odeh et al., GCN 34543) with our 0.4m robotic telecope located in Meckering, Australia. The observation began at 14:11:20 UTC on Aug 24 2023, approximately 11 minutes after the first trigger.\n\nWe obtained multiple expsoures in the B, V, R, and I filters. Exposure lengths were calculated using our automated exposure length scaling model.\n\nWe detected a bright object, in the same location as Odeh et al., GCN 34543, within the uncertainty radius of the Swift localization, at:\nR.A. (J2000): 17:27:43.34\nDec. (J2000): -16:12:19.161\n\nBelow, we report our photometric measurements.\n-------------------------------------------\nDate TimeTakenUTC ExpTime Filter Mag MagErr\n-------------------------------------------\n08-24-2023 | 14:11:20 | 25.721s\t| B | 14.22 | 0.013\n08-24-2023 | 14:11:52 | 28.873s\t| V | 13.88 | 0.011\n08-24-2023 | 14:12:29 | 13.756s\t| R | 13.69 | 0.012\n08-24-2023 | 14:12:49 | 10.774s\t| I | 13.60 | 0.014\n08-24-2023 | 14:15:50 | 37.756s\t| B | 14.25 | 0.010\n08-24-2023 | 14:16:34 | 40.014s\t| V | 13.89 | 0.008\n08-24-2023 | 14:17:21 | 19.012s\t| R | 13.69 | 0.009\n08-24-2023 | 14:17:46 | 15.507s\t| I | 13.67 | 0.012\n08-24-2023 | 14:21:35 | 56.372s\t| V | 13.89 | 0.007\n08-24-2023 | 14:25:40 | 63.628s\t| B | 14.26 | 0.007\n08-24-2023 | 14:26:49 | 66.016s\t| V | 13.88 | 0.006\n08-24-2023 | 14:28:02 | 31.063s\t| R | 13.64 | 0.006\n08-24-2023 | 14:28:40 | 24.327s\t| I | 13.60 | 0.008\n08-24-2023 | 14:33:49 | 84.567s\t| B | 14.25 | 0.006\n08-24-2023 | 14:35:19 | 88.210s\t| V | 13.86 | 0.005\n08-24-2023 | 14:36:53 | 40.934s\t| R | 13.65 | 0.005\n08-24-2023 | 14:37:40 | 32.058s\t| I | 13.63 | 0.007\n08-24-2023 | 14:43:26 | 109.523s | B | 14.25 | 0.006\n08-24-2023 | 14:45:23 | 113.289s | V | 13.89 | 0.005\n08-24-2023 | 14:47:22 | 51.216s\t| R | 13.67 | 0.005\n08-24-2023 | 14:48:20 | 41.685s\t| I | 13.61 | 0.007\n08-24-2023 | 14:54:51 | 140.854s | B | 14.25 | 0.006\n08-24-2023 | 14:57:17 | 147.908s | V | 13.88 | 0.005\n08-24-2023 | 14:59:52 | 65.83s | R | 13.65 | 0.006\n08-24-2023 | 15:01:05 | 53.273s\t| I | 13.58 | 0.007\n08-24-2023 | 15:09:40 | 177.571s | B | 14.15 | 0.005\n08-24-2023 | 15:15:54 | 83.812s\t| R | 13.65 | 0.006\n08-24-2023 | 15:17:25 | 67.06s | I | 13.56 | 0.006\n08-24-2023 | 15:27:51 | 225.946s | B | 14.23 | 0.006\n08-24-2023 | 15:31:42 | 232.571s | V | 13.86 | 0.006\n08-24-2023 | 15:35:41 | 105.216s | R | 13.61 | 0.006\n08-24-2023 | 15:37:32 | 82.401s\t| I | 13.60 | 0.007\n08-24-2023 | 15:50:16 | 284.651s | B | 14.31 | 0.006\n08-24-2023 | 15:55:06 | 293.376s | V | 13.81 | 0.004\n08-24-2023 | 16:00:07 | 131.78s\t| R | 13.57 | 0.005\n08-24-2023 | 16:02:25 | 106.593s | I | 13.51 | 0.005\n08-24-2023 | 16:30:17 | 164.791s | R | 13.53 | 0.006\n08-24-2023 | 16:33:08 | 133.318s | I | 13.50 | 0.009\n\nOur images have been calibrated using stars from the APASS catalog.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyOTk4NzMyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.3Sve5klS2vcf7hmJfUd3y4DdiHT9mHi3HPrKQBP8DO8\n\n",
"published": "2023-08-25T21:25:37.352261Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-25T21:25:37.352283Z",
"modified": "2023-08-25T21:25:37.357083Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2463,
"topic": "igwn.gwalert",
"uuid": "81f25230-c4f4-44e7-85b7-fd83dce22db3",
"title": "S230825co - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230825co/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230825co/view/"
},
"event": {
"far": 1.296131981172502e-06,
"time": "2023-08-25T22:21:09.297Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1510.308914557495,
"area_90": 7003.066175641977,
"duration": null,
"pipeline": "gstlal",
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"sequence_num": 1,
"time_created": "2023-08-25T22:21:33Z",
"superevent_id": "S230825co",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-25T22:21:34.521865Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-25T22:21:34.521887Z",
"modified": "2023-08-25T22:21:34.533969Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2464,
"topic": "igwn.gwalert",
"uuid": "ce70a689-5351-4418-9a43-0cb390c7984d",
"title": "S230825co - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230825co/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230825co/view/"
},
"event": {
"far": 6.632299229757076e-06,
"time": "2023-08-25T22:21:09.298Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1154.8680558105657,
"area_90": 6613.633924263998,
"duration": null,
"pipeline": "gstlal",
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"sequence_num": 2,
"time_created": "2023-08-25T22:26:08Z",
"superevent_id": "S230825co",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-25T22:26:09.280915Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-25T22:26:09.280937Z",
"modified": "2023-08-25T22:26:09.284717Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2465,
"topic": "gcn.circular",
"uuid": "8923a587-736c-4c05-8a75-4222552ab2e0",
"title": "Trigger 1187225: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)",
"submitter": "Hop gcn.circular",
"authors": "Tyler Parsotan at UMBC/GSFC/CRESST II <parsotat@umbc.edu>",
"data": {
"date": "23/08/25 23:43:16 GMT",
"from": "Tyler Parsotan at UMBC/GSFC/CRESST II <parsotat@umbc.edu>",
"title": "GCN CIRCULAR",
"number": "34557",
"subject": "Trigger 1187225: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)"
},
"message_text": "\nT. M. Parsotan (GSFC/UMBC/CRESSTII) and T. Sakamoto (AGU) report on\nbehalf of the Neil Gehrels Swift Observatory Team:\n\nAt 23:31:52 UT, the Swift Burst Alert Telescope (BAT) triggered again\non the Galactic transient Swift J1727.8-1613 (AKA GRB 230824A) (trigger number\n1187203); this is another BAT trigger on this event (see eg GCN Circ.\n34537, 34542 and 34547). Swift XRT and UVOT observations are planned\nfor after the source exits Moon constraint on August 27.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMDA3MDAxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.E-_XQvHy-YQNT73ZRB8XK8fQFC7eVK83Gx0a5o_-1WE\n\n",
"published": "2023-08-25T23:43:27.917073Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-25T23:43:27.917094Z",
"modified": "2023-08-25T23:43:27.925592Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2466,
"topic": "gcn.circular",
"uuid": "6be534e3-102a-41bc-b485-f434b69e9fa8",
"title": "Swift GRB230825.85: 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": "23/08/26 02:34:39 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34558",
"subject": "Swift GRB230825.85: 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-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) was pointed to the Swift GRB230825.85 (trigger No 1187203,17h 27m 42.72s , -16d 12m 21.6s, R=0.05) errorbox 9778 sec after notice time and 9859 sec after trigger time at 2023-08-25 23:04:51 UT, with upper limit up to 16.2 mag. Observations started at twilight. The observations began at zenith distance = 18 deg. The sun altitude is -11.4 deg.\n\nThe galactic latitude b = 10 deg., longitude l = 9 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"60437\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 9949 | MASTER-OAFA | C | 180 | 16.2 |\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMDE3Mjg0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.AIiRSYWb09ip22fdjzuwMwQ9qKoQfwUxjjpDELVqGKA\n\n",
"published": "2023-08-26T02:34:50.259937Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-26T02:34:50.259954Z",
"modified": "2023-08-26T02:34:50.268535Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2467,
"topic": "igwn.gwalert",
"uuid": "51eed34c-3708-43e3-a1d2-711b7cc3ab7b",
"title": "S230826l - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230826l/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230826l/view/"
},
"event": {
"far": 1.835592956922483e-05,
"time": "2023-08-26T03:10:26.167Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1091.7112090084254,
"area_90": 3582.1052777612604,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 0.9301647037854647,
"HasMassGap": 0.29848221620687754,
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},
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"significant": false,
"skymap_hash": "4419ab9c07860ac2ec7244d79908d1cf",
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"BNS": 0.0,
"NSBH": 0.051934721539350574,
"Terrestrial": 0.9429793362434213
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-26T03:10:53Z",
"superevent_id": "S230826l",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-26T03:10:54.058797Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-26T03:10:54.058820Z",
"modified": "2023-08-26T03:10:54.064512Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2468,
"topic": "igwn.gwalert",
"uuid": "c94ce62a-1eff-4f50-b875-49209c915c0a",
"title": "S230826l - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230826l/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230826l/view/"
},
"event": {
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"time": "2023-08-26T03:10:26.167Z",
"group": "CBC",
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"area_50": 1091.7112090084254,
"area_90": 3582.1052777612604,
"duration": null,
"pipeline": "spiir",
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},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-26T03:15:28Z",
"superevent_id": "S230826l",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-26T03:15:29.942518Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-26T03:15:29.942555Z",
"modified": "2023-08-26T03:15:29.946836Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2469,
"topic": "igwn.gwalert",
"uuid": "b42f8791-6e84-4d8f-9d93-ab82fc46aebf",
"title": "S230826n - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230826n/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230826n/view/"
},
"event": {
"far": 3.804806160513125e-06,
"time": "2023-08-26T03:15:33.231Z",
"group": "CBC",
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"area_50": 1325.2446657884327,
"area_90": 4774.74154760633,
"duration": null,
"pipeline": "gstlal",
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"HasMassGap": 0.012106583072100312,
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"skymap_hash": "183722ab058e622b6cfe8438ffd33f6e",
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"BNS": 6.825120563545386e-13,
"NSBH": 4.640760804207636e-11,
"Terrestrial": 0.647058927031104
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-26T03:15:55Z",
"superevent_id": "S230826n",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-26T03:15:57.036985Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-26T03:15:57.037026Z",
"modified": "2023-08-26T03:15:57.040707Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2470,
"topic": "igwn.gwalert",
"uuid": "ad53dc16-dcdf-4b59-969f-52a09fc60b17",
"title": "S230826n - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230826n/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230826n/view/"
},
"event": {
"far": 2.151229e-05,
"time": "2023-08-26T03:15:33.226Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1064.4341655390626,
"area_90": 3837.2505459054555,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.012106583072100312,
"HasRemnant": 0.0
},
"instruments": [
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"L1"
],
"significant": false,
"skymap_hash": "e1d1f8177ea0097432c1dfda70107e28",
"classification": {
"BBH": 0.024046466,
"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.975953534
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-26T03:20:30Z",
"superevent_id": "S230826n",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-26T03:20:31.862712Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-26T03:20:31.862750Z",
"modified": "2023-08-26T03:20:31.867304Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2471,
"topic": "gcn.circular",
"uuid": "ed348e3f-1e4c-4c13-9367-2cb3a13d3a3c",
"title": "LIGO/Virgo/KAGRA S230825k: Upper limits from Swift/BAT-GUANO",
"submitter": "Hop gcn.circular",
"authors": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"data": {
"date": "23/08/26 03:25:51 GMT",
"from": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"title": "GCN CIRCULAR",
"number": "34559",
"subject": "LIGO/Virgo/KAGRA S230825k: Upper limits from Swift/BAT-GUANO"
},
"message_text": "Samuele Ronchini (PSU), Aaron Tohuvavohu (U Toronto), James DeLaunay (U Alabama), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC), Gayathri Raman (PSU) report:\n\nSwift/BAT was observing 86.41% of the GW localization probability (Bilby.offline0.multiorder.fits) at merger time. A fraction 27.82 % of the GW localization posterior is contained inside the BAT coded FoV.\n\nThe LVK notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1).\n\nUpon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground.\n\nUsing the NITRATES analysis (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), we searched for emission on 8 timescales from 0.128s to 16.384s in the interval [-20,+20] seconds around the merger time. We find no evidence for a signal, and derive the following upper limits.\n\nWe quote the 5-sigma flux upper limits in the 15-350 keV band, weighted over the GW localization, for four spectral templates (soft, normal, and hard GRB-like templates described in [arXiv:1612.02395], and spectral shape from GRB170817A [arXiv:1710.05446]) and for four time bins.\nIn units of 10^-7 erg/s/cm^2:\n\ntime_bin (s) soft normal hard GRB170817\n------------------------------------\n0.256 11.0 7.4\t 6.7\t8.2\n1.024 5.6 3.8\t 3.4\t4.2\n4.096 3.0 2.0\t 1.8\t2.3\n16.384 1.9 1.3\t 1.1\t1.4\n\n\nThe upper limits as function of sky position are plotted here, alongside the GW localization:\nhttps://doi.org/10.5281/zenodo.8285069\nThe solid and dashed lines indicate the 90% and 50% GW contour levels, respectively.\n\nThe corresponding fits file can be found here:\nhttps://doi.org/10.5281/zenodo.8285073\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMDIwMzU2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.9I1JsIO6gylw3G4GGPO3hQXPsVELtCri-ABiRkDPA_c\n\n",
"published": "2023-08-26T03:26:01.910510Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-26T03:26:01.910527Z",
"modified": "2023-08-26T03:26:01.914610Z",
"nonlocalizedevents": [
{
"event_id": "S230825k"
}
],
"targets": []
},
{
"id": 2472,
"topic": "gcn.circular",
"uuid": "9a15e9fa-6544-4fa1-a513-ec2533509d71",
"title": "GRB 230818B: CALET Gamma-Ray Burst Monitor detection",
"submitter": "Hop gcn.circular",
"authors": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"data": {
"date": "23/08/26 04:35:14 GMT",
"from": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"title": "GCN CIRCULAR",
"number": "34560",
"subject": "GRB 230818B: CALET Gamma-Ray Burst Monitor detection"
},
"message_text": "Y. Shimizu (Kanagawa U), A. Yoshida, T. Sakamoto,\nS. Sugita (AGU), Y. Kawakubo (LSU),K. Yamaoka (Nagoya U),\nS. Nakahira (JAXA), Y. Asaoka (ICRR), S. Torii, Y. Akaike,\nK. Kobayashi (Waseda U), T. Tamura (Kanagawa U),\nN. Cannady (GSFC/UMBC),\nM. L. Cherry (LSU), S. Ricciarini (U of Florence),\nP. S. Marrocchesi (U of Siena),\nand the CALET collaboration:\n\nThe long GRB 230818B (AstroSat CZTI detection:\nNavaneeth et al., GCN Circ. 34524; VZLUSAT-2 detection:\nDafcikova et al., GCN Circ. 34525; Konus/Wind detection at\n2023-08-18 10:12:54.913 UT) triggered the CALET Gamma-ray\nBurst Monitor (CGBM) at 10:12:54.02 UTC on 18 August 2023\n(http://cgbm.calet.jp/cgbm_trigger/flight/1376388662/).\nThe burst signal was seen by all CGBM detectors.\nBecause of a problem in one of the ground alert processing script,\nthe GCN notice was not distributed automatically for this event.\n\nThe burst light curve shows a multi-peaked structure that starts\nat T-0.6 sec, peaks at T+0.6 sec, and ends at T+32.0 sec.\nThe T90 and T50 durations measured by the SGM data are 27.6 +/- 1.2 sec\nand 13.3 +/- 0.6 sec (40-1000 keV), respectively.\n\nThe ground-processed light curve is available at\n\nhttp://cgbm.calet.jp/cgbm_trigger/ground/1376388662/index.html\n\nThe CALET data used in this analysis are provided by\nthe Waseda CALET Operation Center located at Waseda University.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMDI0NTIwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.1ptky1XrrOouEZqjHKKc7nJXF2mp6M_LusnOBJs_72g\n\n",
"published": "2023-08-26T04:35:31.557923Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-26T04:35:31.557942Z",
"modified": "2023-08-26T04:35:31.564345Z",
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{
"id": 2473,
"topic": "igwn.gwalert",
"uuid": "315460e5-39f2-4dc3-9bba-1edf002d9acb",
"title": "S230826y - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"published": "2023-08-26T05:09:03.022753Z",
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"created": "2023-08-26T05:09:03.022775Z",
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{
"id": 2474,
"topic": "igwn.gwalert",
"uuid": "380992d5-766a-4f6a-a2d7-90d0f9dd50d1",
"title": "S230826y - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"published": "2023-08-26T05:13:37.736829Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
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{
"id": 2475,
"topic": "gcn.circular",
"uuid": "28d35537-1e82-4df3-878f-e3528c3dc937",
"title": "GRB 230824A: AKO Photometric Follow-up Observations",
"submitter": "Hop gcn.circular",
"authors": "Mohammad Odeh at Al Khatim Observatory M44 <mshodeh@gmail.com>",
"data": {
"date": "23/08/26 07:30:58 GMT",
"from": "Mohammad Odeh at Al Khatim Observatory M44 <mshodeh@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34561",
"subject": "GRB 230824A: AKO Photometric Follow-up Observations"
},
"message_text": "Mohammad Odeh, Osama Ghannam, Anas Mohammad, Khalfan Al-Noaimy, and Sameh\nAl-Ashi, report on behalf of Al-Khatim Observatory (AKO) operated by the\nInternational Astronomical Center in Abu Dhabi, UAE:\n\nAs a follow-up for the GRB 230824A (Page et al., GCN 34537), also known as\nSwift J1727.8-1613 (Dichiara et al., GCN 34542), also known as AT 2023qql\n (Zhang and Gao, https://www.wis-tns.org/object/2023qql) we observed the\ntarget with our 0.36m f/7.7 robotic telescope for the second night on 25\nAugust 2023, and we obtained multiple 180-sec exposures in R filter. The\nbelow table summarizes the results of the two nights:\n\nR.A. (J2000)= 17:27:43.32\nDec. (J2000)= -16:12:19.2\n-----------------------------------------------------------------------------\nObsTime (mid), t(mid) â t(0) (hours), Exposure (sec), Filter, Mag\n-----------------------------------------------------------------------------\n2023-08-24T18:29:24Z, 04.5, 180s, R, 13.5 +/- 0.04\n2023-08-25T16:29:44Z, 26.5, 180s, R, 13.0 +/- 0.01\n-----------------------------------------------------------------------------\n\nThe observations were calculated using the Atlas catalogue as a reference\nand are not corrected for galactic extinction.\n\nThe object is added to The International Variable Star Index catalogue and\nphotometric observations can be submitted through AAVSO website.\n\nObject Page:\nhttps://www.aavso.org/vsx/index.php?view=detail.top&oid=2387757\n\nSubmission Form:\nhttps://www.aavso.org/webobs\n\nCurrent Photometric Results:\nhttps://www.aavso.org/LCGv2/\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMDM1MDY0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.INFnFnoc8FFd0tlElXthRRiOdPIn9yoAiEeM1CUBZ6I\n\n",
"published": "2023-08-26T07:31:11.461890Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-26T07:31:11.461912Z",
"modified": "2023-08-26T07:31:11.471802Z",
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{
"id": 2476,
"topic": "gcn.circular",
"uuid": "d1143f6d-f3c4-4233-9b1b-fd31d49a57c0",
"title": "Swift J1727.8-1613 (GRB 230824A): Bassano Bresciano Observatory optical observations",
"submitter": "Hop gcn.circular",
"authors": "Ulisse Quadri at Bassano Bresciano Obs <oabb@ulisse.bs.it>",
"data": {
"date": "23/08/26 08:05:10 GMT",
"from": "Ulisse Quadri at Bassano Bresciano Obs <oabb@ulisse.bs.it>",
"title": "GCN CIRCULAR",
"number": "34562",
"subject": "Swift J1727.8-1613 (GRB 230824A): Bassano Bresciano Observatory optical observations"
},
"message_text": "U.Quadri, P.Madurini and L.Strabla (Bassano Bresciano Astronomical Observatory),\n\nMember of:\nAAVSO - American Association of Variable Star Observers.\nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili.\nGAC - Gruppo Astrofili Cremonesi.\n\nin a large collaboration with:\nM.G. Dainotti (National Astronomical Observatory of Japan),\nY. Niino (Tokyo University, Institute of Astronomy),\nK. Kalinowski (Aarhus University, Department of Physics and Astronomy),\nB. De Simone (Universita' degli Studi Di Salerno)\nreport:\n\nWe imaged the field of Swift J1727.8-1613(GRB 230824A)\n(Page et al., GCN 34537; Navaneeth et al., GCN 34538, Odeh et al., GCN 34543)\nwith the following telescopes:\n\n0.25-m f/4.8 Newton reflector at Bassano Bresciano Observatory, Italy - MPC Code 565.\n0.32-m f/8.0 (iTelescope) reflector at AstroCamp at Nerpio, Spain - MPC Code I89.\n0.51-m f/6.8 (iTelescope) Dall-Kirkham at Rio Hurtado Valley, Chile - MPC Code X07.\n\n\nWe clearly detected a bright object, in the same location as M.Odeh et al., GCN 34543, within\nthe uncertainty radius of the Swift localization, at:\n\nR.A. (J2000): 17:27:43.32\nDec. (J2000): -16:12:18.8\n\n\nThe results of our photometry are:\n\n------------------------------------------------------\n Date UT Exp Time R-mag Err IAU STATION\n------------------------------------------------------\n\n2023-08-24.7967 18x20s 13.25 0.057 565\n2023-08-24.8018 18x20s 13.25 0.049 565\n2023-08-24.8071 12x30s 13.24 0.048 565\n2023-08-24.8124 12x30s 13.24 0.043 565\n2023-08-24.8185 12x30s 13.24 0.042 565\n2023-08-24.9030 10x60s 13.05 - I89\n2023-08-25.1470 10x60s 12.80 - X07\n------------------------------------------------------\n\nMagnitudes were estimated with the pan-STARRS cat.\nand are converted using Lupton (2005) equations.\n\nNot corrected for galactic dust extinction.\n\nFurther observations are planned.\n\nReference:\nhttp://www.osservatoriobassano.org/GRB.asp\n\nThe message may be cited.\n\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMDM3MTE2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.ErSzselkhtfn-5KNUzKw-caAGLKS6dwP9MnPD3YUk2k\n\n",
"published": "2023-08-26T08:05:21.695063Z",
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"retracted": false,
"created": "2023-08-26T08:05:21.695080Z",
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"title": "S230826ac - PRELIMINARY",
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{
"id": 2478,
"topic": "igwn.gwalert",
"uuid": "f02cd21f-4c5e-4ed2-9433-36edd2410d13",
"title": "S230826ac - PRELIMINARY",
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"data": {
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"title": "S230826al - PRELIMINARY",
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"data": {
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"topic": "igwn.gwalert",
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"title": "S230826al - PRELIMINARY",
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"data": {
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"title": "S230826ar - PRELIMINARY",
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{
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"title": "S230826ar - PRELIMINARY",
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"title": "S230826be - PRELIMINARY",
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"title": "S230826bf - PRELIMINARY",
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"title": "S230826bf - PRELIMINARY",
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{
"id": 2489,
"topic": "gcn.circular",
"uuid": "433531c2-1543-4644-810a-ef8c072f89aa",
"title": "Swift GRB230826.81: 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": "23/08/26 19:40:43 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34563",
"subject": "Swift GRB230826.81: 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-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Swift GRB230826.81 (trigger No 1187463,05h 32m 02.88s , +66d 07m 30.0s, R=0.05) errorbox 23 sec after notice time and 45 sec after trigger time at 2023-08-26 19:33:32 UT, with upper limit up to 17.7 mag. The observations began at zenith distance = 66 deg. The sun altitude is -28.0 deg.\n\nThe galactic latitude b = 18 deg., longitude l = 147 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"60933\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 50 | MASTER-Tavrida | C | 10 | 17.0 |\n 67 | MASTER-Tavrida | C | 10 | 16.9 |\n 89 | MASTER-Tavrida | C | 20 | 17.3 |\n 117 | MASTER-Tavrida | C | 20 | 17.3 |\n 149 | MASTER-Tavrida | C | 30 | 17.6 |\n 186 | MASTER-Tavrida | C | 30 | 17.5 |\n 229 | MASTER-Tavrida | C | 40 | 17.7 |\n 282 | MASTER-Tavrida | C | 50 | 17.7 |\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMDc4ODQ4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.2JG_aQHN0Syaw2GM_muKAXnGll0bQjMTL8pyl4BaUm0\n\n",
"published": "2023-08-26T19:40:58.185928Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-26T19:40:58.185981Z",
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{
"id": 2490,
"topic": "gcn.circular",
"uuid": "8ae60294-eeec-42b9-b799-dae364e20159",
"title": "GRB 230826A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "23/08/26 19:43:17 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34564",
"subject": "GRB 230826A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 19:32:44 UT on 26 Aug 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230826A (trigger 714771169.528076 / 230826814).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 82.8, Dec = 67.1 (J2000 degrees, equivalent to J2000 05h 31m, 67d 05'), with a statistical uncertainty of 2.0 degrees.\n\nThe angle from the Fermi LAT boresight is 117.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230826814/quicklook/glg_skymap_all_bn230826814.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230826814/quicklook/glg_healpix_all_bn230826814.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230826814/quicklook/glg_lc_medres34_bn230826814.gif\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMDc5MDAwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.i7ATjuxdfSmkVHBRuNPxgLXWw5_-XU9_9hysnYhKihE\n\n",
"published": "2023-08-26T19:43:25.507127Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-26T19:43:25.507144Z",
"modified": "2023-08-26T19:43:25.510632Z",
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{
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"topic": "igwn.gwalert",
"uuid": "17b6e5d2-9231-4829-8989-a3192a01916b",
"title": "S230826bi - PRELIMINARY",
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"topic": "igwn.gwalert",
"uuid": "3d6e1805-9b89-4912-a43e-2034bcc9e029",
"title": "S230826bi - PRELIMINARY",
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{
"id": 2493,
"topic": "gcn.circular",
"uuid": "a8caa56b-b77c-4eaf-bb09-1056886e1eff",
"title": "GRB 230826A: Swift detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "David Palmer at LANL <palmer@lanl.gov>",
"data": {
"date": "23/08/26 20:16:03 GMT",
"from": "David Palmer at LANL <palmer@lanl.gov>",
"title": "GCN CIRCULAR",
"number": "34565",
"subject": "GRB 230826A: Swift detection of a burst"
},
"message_text": "\nR. A. J. Eyles-Ferris (U Leicester), S. Dichiara (PSU),\nJ.D. Gropp (PSU), J. A. Kennea (PSU), D. M. Palmer (LANL),\nT. M. Parsotan (GSFC/UMBC/CRESSTII), M. H. Siegel (PSU) and\nA. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nAt 19:32:47 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 230826A (trigger\u001187463). Swift slewed immediately to\nthe location. The BAT on-board calculated location is\nRA, Dec 83.012, +66.125 which is\n RA(J2000) = 05h 32m 03s\n Dec(J2000) = +66d 07' 30\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including\nsystematic uncertainty). Preliminary quicklook data suggests that the\nlight curve is doubly peaked with a T90 of ~50 sec and background\nsubtracted peak count rate of ~4000 counts/sec at T0+3 sec.\n\nThe XRT began observing the field at 19:34:03.7 UT, 76.7 seconds after\nthe BAT trigger. Using promptly downlinked data we find a bright,\nuncatalogued X-ray source located at RA, Dec 83.05920, 66.12506 which\nis equivalent to:\n RA(J2000) = 5h 32d 14.2s,\n Dec(J2000) = 66h 07d 30.2s\nwith an uncertainty of 10.0 arcseconds (radius, 90% containment). This\nlocation is 69 arcseconds from the BAT onboard position, within the BAT\nerror circle.\n\nDue to a telemetry gap, no further information is available at\nthis time. However a simultaneous Fermi trigger (GCN #34564)\nconfirms the GRB.\n\nBurst Advocate for this burst is R. A. J. Eyles-Ferris (raje1 AT leicester.ac.uk).\nPlease contact the BA by email if you require additional information\nregarding Swift followup of this burst. In extremely urgent cases, after\ntrying the Burst Advocate, you can contact the Swift PI by phone (see\nSwift TOO web site for information: http://www.swift.psu.edu/)\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMDgwOTY4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.J8bjIv6bq9lDGB2hCIuVeC1o1-n-vAm6B5VU3sZ6HZI\n\n",
"published": "2023-08-26T20:16:14.442808Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-26T20:16:14.442828Z",
"modified": "2023-08-26T20:16:14.447874Z",
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},
{
"id": 2494,
"topic": "gcn.circular",
"uuid": "d04b609c-ae50-4069-b6f4-8dbd0dbb20d5",
"title": "Swift J1727.8-1613 (GRB 230824A): GAD Observatory La Spezia - optical observations",
"submitter": "Hop gcn.circular",
"authors": "Claudio Lopresti <cl3lop@gmail.com>",
"data": {
"date": "23/08/26 20:45:21 GMT",
"from": "Claudio Lopresti <cl3lop@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34566",
"subject": "Swift J1727.8-1613 (GRB 230824A): GAD Observatory La Spezia - optical observations"
},
"message_text": "Claudio Lopresti (Gruppo Astronomia Digitale - GAD Observatory, La Spezia, Italy - UAI SSV- GRB Section)\nin a large collaboration with:\nM.G. Dainotti (National Astronomical Observatory of Japan),\nY. Niino (Tokyo University, Institute of Astronomy),\nK. Kalinowski (Aarhus University, Department of Physics and Astronomy),\nB. De Simone (Universita' degli Studi Di Salerno)\nUnione Astrofili Italiani (UAI SSV- GRB Section)\nreport:\n\nI imaged the field of of Swift J1727.8-1613 (GRB 230824A) (Page et al., GCN 34537; Navaneeth et al., GCN 34538, Odeh et al., GCN 34543) with the following telescope: 0.18-m f/4 Mak-Newton reflector at GAD Observatory, Italy, with filters Infrared, Red, and V. I clearly detected a bright object, in the same location as M.Odeh et al., GCN 34543, within the uncertainty radius of the Swift localization, at: R.A. (J2000): 17:27:43.32 Dec. (J2000): -16:12:18.8.\n\nThe results of photometry are:\n\nIn Infrared band:\n============================================ Date UT Exp Time I-mag Err\n============================================2460181.3096064800 90s 13.71 0.10\n2460181.3143750000 90s 13.85 0.08\n2460181.3191319400 90s 13.83 0.04\n2460181.3239004600 90s 13.78 0.03\n2460181.3286689800 90s 13.80 0.02\n2460181.3334259200 90s 13.82 0.06\n2460181.3519444400 90s 13.90 0.09\n2460181.3559490700 180s 13.72 0.09\n2460181.3599537000 180s 13.79 0.05\n2460181.3639583300 180s 13.69 0.03\n2460181.3679745300 180s 13.73 0.03\n2460181.3719907400 180s 13.83 0.07\n2460181.3760069400 180s 13.71 0.09\n\n\nIn Red band:\n============================================ Date UT Exp Time R-mag Err\n============================================2460181.3119675900 90s 14.09 0.00\n2460181.3167361100 90s 14.09 0.02\n2460181.3215046200 90s 14.05 0.04\n2460181.3262615700 90s 14.14 0.05\n2460181.3310300900 90s 14.15 0.08\n2460181.3532407400 90s 14.01 0.07\n2460181.3572569400 180s 14.06 0.05\n2460181.3612615700 180s 13.96 0.06\n2460181.3652662000 180s 13.96 0.00\n2460181.3692824000 180s 13.96 0.01\n2460181.3732986100 180s 13.98 0.01\n\n\nIn V band:\n============================================ Date UT Exp Time V-mag Err\n============================================2460181.3586111100 90s 13.51 0.09\n2460181.3626157400 90s 13.37 0.07\n2460181.3666203700 90s 13.44 0.04\n2460181.3706365700 90s 13.46 0.01\n2460181.3746527700 90s 13.45 0.01\n\n\nMagnitudes were estimated with the PanSTARRS cat., not corrected for galactic dust extinction. Weather conditions were good.\n\nReference:\nhttps://www.parcodellestelle.com/\n\nThe message may be cited.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMDgyNzI2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Xt9BlpDuQ16bmXRrHUtkEtlIgJ13TjgD6XvkCIRk2EY\n\n",
"published": "2023-08-26T20:45:31.896722Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-26T20:45:31.896748Z",
"modified": "2023-08-26T20:45:31.901862Z",
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},
{
"id": 2495,
"topic": "gcn.circular",
"uuid": "ca7c968a-45c7-448b-80b2-75e22a92051f",
"title": "GRB 230826A: Mondy optical observations",
"submitter": "Hop gcn.circular",
"authors": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"data": {
"date": "23/08/27 01:28:38 GMT",
"from": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"title": "GCN CIRCULAR",
"number": "34567",
"subject": "GRB 230826A: Mondy optical observations"
},
"message_text": "N. Pankov (HSE, IKI), E. Klunko (ISTP), A. Pozanenko (IKI), S. Belkin (IKI) on behalf of GRB-IKI-FuN report.\n\nWe observed the field of GRB 230826A detected by Fermi GBM (Fermi GBM Team, GCN 34564) and Swift (Eyles-Ferris et al, 34565) with AZT-33IK telescope of Sayan observatory (Mondy). Observations started on 2023-08-26 220:06:00 (UT) (i.e. ~33 min since trigger). We obtained\nseries of images in R-filter. We do not detect evident candidate within XRT error circle (Swift-XRT Position: +05h 32m 14.20s +66d 07' 30.0\" 5.3 arcsec, radius) in a stacked image. Preliminary photometry is following:\n\nDate UT start t-T0 Filter Exp. OT Err. UL(3sigma)\n (mid, days) (s)\n\n2023-08-26 20:06:00 0.038345 R 44*60 n/d n/d 22.0\n\nWe note the presence of the object USNO-B1.0 1561-0095652 at 8.8 arces from the Swift-XRT Position. Measured brightness of the object is R = 18.1 +/- 0.01 what is brighter than USNO-B1.0 R2\u0018.22 magnitude.\n\nAll photometry is based on nearby USNO-B1.0 stars, R2 magnitudes\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMDk5NzIzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Fjffm8bxupQY5IQjc_OK8zjAL1PJvF1W8l3tK8BtTPA\n\n",
"published": "2023-08-27T01:28:52.678483Z",
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"retracted": false,
"created": "2023-08-27T01:28:52.678516Z",
"modified": "2023-08-27T01:28:52.683688Z",
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"title": "S230827o - PRELIMINARY",
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{
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"topic": "igwn.gwalert",
"uuid": "571241fd-b3ad-48a7-9a08-0b5ccee8fe39",
"title": "S230827o - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"published": "2023-08-27T04:27:24.838648Z",
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{
"id": 2498,
"topic": "igwn.gwalert",
"uuid": "3b88fc02-00bf-4b93-a59d-75449b0a225e",
"title": "S230827s - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"time_created": "2023-08-27T06:51:33Z",
"superevent_id": "S230827s",
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"published": "2023-08-27T06:51:35.647395Z",
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"retracted": false,
"created": "2023-08-27T06:51:35.647417Z",
"modified": "2023-08-27T06:51:35.652863Z",
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{
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"title": "S230827s - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
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"time_created": "2023-08-27T06:56:08Z",
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"published": "2023-08-27T06:56:09.343250Z",
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"created": "2023-08-27T06:56:09.343270Z",
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"published": "2023-08-27T07:13:36.798810Z",
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