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{
"id": 2201,
"topic": "igwn.gwalert",
"uuid": "11c5945a-bab7-441b-aecb-9bdcd1e840d7",
"title": "S230818bt - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230818bt/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230818bt/view/"
},
"event": {
"far": 2.00923368538497e-05,
"time": "2023-08-18T23:31:17.376Z",
"group": "CBC",
"search": "AllSky",
"area_50": 167.07189124984794,
"area_90": 538.6166968142663,
"duration": null,
"pipeline": "spiir",
"properties": {
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"HasMassGap": 0.4371244074860806,
"HasRemnant": 6.549334786081319e-06
},
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"H1",
"L1"
],
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"skymap_hash": "012778bf231b3cb1e4f3cfec6b671f8e",
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"BNS": 0.0,
"NSBH": 0.04227650372908914,
"Terrestrial": 0.9433156477824689
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-18T23:31:43Z",
"superevent_id": "S230818bt",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-18T23:31:44.610108Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-18T23:31:44.610141Z",
"modified": "2023-08-18T23:31:44.617044Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2202,
"topic": "gcn.circular",
"uuid": "b18552b6-37ac-4fd9-9150-a54b1df026db",
"title": "Swift GRB230818.98: Global MASTER-Net OT detection",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/08/18 23:32:12 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34476",
"subject": "Swift GRB230818.98: Global MASTER-Net OT detection"
},
"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, Yu.Tselik\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. Gress, 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\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\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 GRB230818.98 22 sec after notice time and 37 sec after trigger time at 2023-08-18 23:28:11 UT. On our first (10s exposure) set we found 1 optical transient within Swift error-box (ra(5.879 dec@.8758 r=0.05) brighter than 16.8.\n\n\n T-Tmid Date Time Expt. Ra Dec Mag\n---------|---------------------|-------|-----------------|-----------------|-------\n 42 2023-08-18 23:28:11 10 (19h 03m 33.11s , +40d 53m 48.5s) 15.5\n\nThe 5-sigma upper limit has been about 16.8mag\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDAxNTM4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.LtivGmtqGme01kocA2BxbGCtUUNO5ZelyJuD7UWxot8\n\n",
"published": "2023-08-18T23:32:23.828766Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-18T23:32:23.828800Z",
"modified": "2023-08-18T23:32:23.842874Z",
"nonlocalizedevents": [],
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{
"id": 2203,
"topic": "igwn.gwalert",
"uuid": "92a47f2c-7ffe-4e28-aee6-52bd5358bcac",
"title": "S230818bt - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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},
"event": {
"far": 2.00923368538497e-05,
"time": "2023-08-18T23:31:17.376Z",
"group": "CBC",
"search": "AllSky",
"area_50": 167.07189124984794,
"area_90": 538.6166968142663,
"duration": null,
"pipeline": "spiir",
"properties": {
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"HasMassGap": 0.4371244074860806,
"HasRemnant": 6.549334786081319e-06
},
"instruments": [
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"skymap_hash": "012778bf231b3cb1e4f3cfec6b671f8e",
"classification": {
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"BNS": 0.0,
"NSBH": 0.04227650372908914,
"Terrestrial": 0.9433156477824689
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"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-18T23:36:17Z",
"superevent_id": "S230818bt",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-18T23:36:19.549582Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-18T23:36:19.549602Z",
"modified": "2023-08-18T23:36:19.553232Z",
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{
"id": 2204,
"topic": "gcn.circular",
"uuid": "bc7f5192-eb97-4172-ac2d-c00a6f112d8c",
"title": "Swift GRB230818.98: 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": "23/08/18 23:36:25 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34477",
"subject": "Swift GRB230818.98: 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 GRB230818.98 (trigger No 1186032,19h 03m 31.90s , +40d 52m 34.7s, R=0.05) errorbox 19 sec after notice time and 37 sec after trigger time at 2023-08-18 23:28:11 UT, with upper limit up to 18.6 mag. The observations began at zenith distance = 48 deg. The sun altitude is -28.4 deg.\n\nMASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB230818.98 errorbox 24 sec after notice time and 41 sec after trigger time at 2023-08-18 23:28:15 UT, with upper limit up to 17.9 mag. The observations began at zenith distance = 54 deg. The sun altitude is -26.2 deg.\n\nThe galactic latitude b = 15 deg., longitude l = 72 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"56038\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 42 | MASTER-Tavrida | C | 10 | 17.3 |\n 47 | MASTER-Kislovodsk | P- | 10 | 14.2 |\n 47 | MASTER-Kislovodsk | P| | 10 | 16.4 |\n 57 | MASTER-Kislovodsk | P| | 30 | 17.1 | Coadd\n 59 | MASTER-Tavrida | C | 10 | 17.9 |\n 65 | MASTER-Kislovodsk | P- | 10 | 14.2 |\n 65 | MASTER-Kislovodsk | P| | 10 | 16.5 |\n 76 | MASTER-Tavrida | C | 10 | 18.0 |\n 83 | MASTER-Kislovodsk | P- | 10 | 14.5 |\n 83 | MASTER-Kislovodsk | P| | 10 | 16.5 |\n 99 | MASTER-Tavrida | C | 20 | 18.3 |\n 105 | MASTER-Kislovodsk | P- | 20 | 16.0 |\n 105 | MASTER-Kislovodsk | P| | 20 | 17.2 |\n 130 | MASTER-Kislovodsk | P| | 70 | 17.8 | Coadd\n 126 | MASTER-Tavrida | C | 20 | 18.3 |\n 134 | MASTER-Kislovodsk | P- | 20 | 16.0 |\n 134 | MASTER-Kislovodsk | P| | 20 | 17.0 |\n 159 | MASTER-Tavrida | C | 30 | 18.4 |\n 167 | MASTER-Kislovodsk | P- | 30 | 16.1 |\n 167 | MASTER-Kislovodsk | P| | 30 | 17.5 |\n 201 | MASTER-Tavrida | C | 40 | 18.6 |\n 210 | MASTER-Kislovodsk | P- | 40 | 16.1 |\n 210 | MASTER-Kislovodsk | P| | 40 | 17.7 |\n 253 | MASTER-Tavrida | C | 50 | 18.6 |\n 263 | MASTER-Kislovodsk | P- | 50 | 16.2 |\n 263 | MASTER-Kislovodsk | P| | 50 | 17.8 |\n 326 | MASTER-Kislovodsk | P- | 60 | 16.2 |\n 326 | MASTER-Kislovodsk | P| | 60 | 17.9 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDAxNzkxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.9_Dko6JxFxxgkW9wbLOwq6fhR6Zm51vrX1CCpIHnCHE\n\n",
"published": "2023-08-18T23:36:35.593049Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-18T23:36:35.593065Z",
"modified": "2023-08-18T23:36:35.596846Z",
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"targets": []
},
{
"id": 2205,
"topic": "gcn.circular",
"uuid": "38d2acbf-c10e-484d-a842-74fc1d0a65bb",
"title": "GRB 230818A: 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": "23/08/18 23:38:02 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34478",
"subject": "GRB 230818A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 23:27:35 UT on 18 Aug 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230818A (trigger 714094060.372856 / 230818977).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 289.2, Dec = 41.0 (J2000 degrees, equivalent to J2000 19h 16m, 41d 00'), with a statistical uncertainty of 2.7 degrees.\n\nThe angle from the Fermi LAT boresight is 79.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230818977/quicklook/glg_skymap_all_bn230818977.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/bn230818977/quicklook/glg_healpix_all_bn230818977.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230818977/quicklook/glg_lc_medres34_bn230818977.gif\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDAxODg0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.opxGEhMis4j-qxA3ZYPtUB2xQDQn0u7b6hP1JM8mUiA\n\n",
"published": "2023-08-18T23:38:09.843153Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-18T23:38:09.843168Z",
"modified": "2023-08-18T23:38:09.846561Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2206,
"topic": "gcn.circular",
"uuid": "d3a25318-afe5-4c39-bef5-c37a37ebe16d",
"title": "GRB 230818A: Swift detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "David Palmer at LANL <palmer@lanl.gov>",
"data": {
"date": "23/08/18 23:44:09 GMT",
"from": "David Palmer at LANL <palmer@lanl.gov>",
"title": "GCN CIRCULAR",
"number": "34479",
"subject": "GRB 230818A: Swift detection of a burst"
},
"message_text": "\nA. Tohuvavohu (U Toronto), S. Dichiara (PSU), J.D. Gropp (PSU),\nD. M. Palmer (LANL), T. M. Parsotan (GSFC/UMBC/CRESSTII),\nB. Sbarufatti (INAF-OAB) and M. A. Williams (PSU) report on behalf of\nthe Neil Gehrels Swift Observatory Team:\n\nAt 23:27:34 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 230818A (trigger\u001186032). Swift slewed immediately to the burst.\nThe BAT on-board calculated location is\nRA, Dec 285.883, +40.876 which is\n RA(J2000) = 19h 03m 32s\n Dec(J2000) = +40d 52' 35\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including\nsystematic uncertainty). The BAT light curve showed a single complex\npeak structure with a duration of about 10 sec. The peak count rate\nwas ~6000 counts/sec (15-350 keV), at ~1 sec after the trigger.\n\nThe XRT began observing the field at 23:29:55.4 UT, 141.1 seconds after\nthe BAT trigger. Using promptly downlinked data we find an uncatalogued\nX-ray source located at RA, Dec 285.88966, 40.89504 which is equivalent\nto:\n RA(J2000) = 19h 03m 33.52s\n Dec(J2000) = +40d 53' 42.1\"\nwith an uncertainty of 3.7 arcseconds (radius, 90% containment). This\nlocation is 70 arcseconds from the BAT onboard position, within the BAT\nerror circle. This position may be improved as more data are received;\nthe latest position is available at https://www.swift.ac.uk/sper. We\ncannot determine whether the source is fading at the present time.\n\nA power-law fit to a spectrum formed from promptly downlinked event\ndata gives a column density consistent with the Galactic value of 1.13\nx 10^21 cm^-2 (Willingale et al. 2013).\n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 144 seconds after the BAT trigger. No credible afterglow candidate has\nbeen found in the initial data products. The 2.7'x2.7' sub-image covers 100% of\nthe XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag.\nResults from the list of sources generated on-board are not available at this\ntime. No correction has been made for the expected extinction corresponding to\nE(B-V) of 0.101.\n\nBurst Advocate for this burst is A. Tohuvavohu (aaron.tohu AT gmail.com).\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDAyMjU0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.tSeDOvbrzi_rXXHRbIL3w3nTEiT4qtKtULzyJeyhzW0\n\n",
"published": "2023-08-18T23:44:18.675787Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-18T23:44:18.675804Z",
"modified": "2023-08-18T23:44:18.679727Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2207,
"topic": "igwn.gwalert",
"uuid": "a7ee4455-0595-40fa-a7b6-84741f611a60",
"title": "S230818bv - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230818bv/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230818bv/view/"
},
"event": {
"far": 2.516280302475613e-06,
"time": "2023-08-18T23:49:09.062Z",
"group": "CBC",
"search": "AllSky",
"area_50": 397.7727319772675,
"area_90": 1643.336957323465,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.04116666517625597,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "32a0e5c64be49bd213e0c964ccb8147c",
"classification": {
"BBH": 0.4403164784718207,
"BNS": 4.80944800426691e-17,
"NSBH": 2.8882917331270737e-15,
"Terrestrial": 0.5596835215281764
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-18T23:49:45Z",
"superevent_id": "S230818bv",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-18T23:49:46.597443Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-18T23:49:46.597463Z",
"modified": "2023-08-18T23:49:46.600986Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2208,
"topic": "igwn.gwalert",
"uuid": "0d2f612a-0139-4089-bbf2-9dff9374d4dd",
"title": "S230818bv - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230818bv/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230818bv/view/"
},
"event": {
"far": 2.516280302475613e-06,
"time": "2023-08-18T23:49:09.062Z",
"group": "CBC",
"search": "AllSky",
"area_50": 397.7727319772675,
"area_90": 1643.336957323465,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.04116666517625597,
"HasRemnant": 0.0
},
"instruments": [
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"L1"
],
"significant": false,
"skymap_hash": "32a0e5c64be49bd213e0c964ccb8147c",
"classification": {
"BBH": 0.4403164784718207,
"BNS": 4.80944800426691e-17,
"NSBH": 2.8882917331270737e-15,
"Terrestrial": 0.5596835215281764
},
"skymap_version": 0,
"central_frequency": null
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"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-18T23:54:19Z",
"superevent_id": "S230818bv",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-18T23:54:20.368214Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-18T23:54:20.368233Z",
"modified": "2023-08-18T23:54:20.371706Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2209,
"topic": "gcn.circular",
"uuid": "2732fb8a-a13f-461d-a896-6f4e0ba4b97f",
"title": "GRB 230818A: GOTO optical afterglow detection",
"submitter": "Hop gcn.circular",
"authors": "Ben Gompertz at U of Birmingham <b.gompertz@bham.ac.uk>",
"data": {
"date": "23/08/19 01:17:17 GMT",
"from": "Ben Gompertz at U of Birmingham <b.gompertz@bham.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34480",
"subject": "GRB 230818A: GOTO optical afterglow detection"
},
"message_text": "B. P. Gompertz, A. Kumar, K. Wiersema, B. Godson, D. OâNeill, B. Warwick, R. Starling, K. Ackley; M. J. Dyer; J. Lyman; K. Ulaczyk; F. Jimenez-Ibarra; D. Steeghs; D. K. Galloway; V. Dhillon; P. O'Brien; G. Ramsay; K. Noysena; R. Kotak; R. P. Breton; L. K. Nuttall; E. Pall'e and D. Pollacco report on behalf of the GOTO collaboration:\n\nThe Gravitational-wave Optical Transient Observer (GOTO; Steeghs et al. 2022) observed the field of the X-ray (Tohuvavohu et al., GCN 34479) and optical (Lipunov et al, GCN 34476) counterparts to GRB 230818A (Fermi GBM Team, GCN 34478; Tohuvavohu et al., GCN 34479) at 23:32:00 UT on 2023-08-18, 266 seconds after trigger. The observation consisted of 4x90s exposures in the GOTO L-band (400-700 nm).\n\nImages were processed immediately after acquisition using the GOTO pipeline. Difference imaging was performed using recent survey observations of the same pointing. We detect the optical counterpart reported by MASTER (GCN 34476) with a preliminary magnitude of L = 17.75 ± 0.02 mag.\n\nMagnitudes were calibrated using ATLAS-REFCAT2 (Tonry et al. 2018) and are not corrected for Galactic extinction.\n\nObservations are ongoing.\nGOTO (https://goto-observatory.org) is a network of telescopes operated at the Roque de los Muchachos Observatory on La Palma, Spain, and Siding Spring Observatory in NSW, Australia, on behalf of a consortium including the University of Warwick, Monash University, Armagh Observatory & Planetarium, the University of Leicester, the University of Sheffield, the National Astronomical Research Institute of Thailand (NARIT), the University of Turku, the University of Portsmouth, the University of Manchester and the Instituto de Astrofisica de Canarias (IAC).\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDA3ODQzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.JZDzY8Sqyf6BUAl5epLIomJpp-aUBQYNZaWDj-FpZBM\n\n",
"published": "2023-08-19T01:17:28.831739Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-19T01:17:28.831757Z",
"modified": "2023-08-19T01:17:28.837577Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2210,
"topic": "gcn.circular",
"uuid": "1bb5c3de-c1f5-4427-b5fd-75268a2b208c",
"title": "Fermi trigger No 713974668: 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": "23/08/19 01:33:04 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34481",
"subject": "Fermi trigger No 713974668: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB230817.60 (trigger No 713974668,07h 55m 24.00s , +21d 31m 01.2s, R(.7) errorbox 1 days 19084 sec after notice time and 1 days 19116 sec after trigger time at 2023-08-18 19:36:20 UT, with upper limit up to 18.2 mag. The observations began at zenith distance = 85 deg. The sun altitude is -29.6 deg.\n\nThe galactic latitude b = 24 deg., longitude l = 200 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"55394\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 105581 | 2023-08-18 19:36:20 | MASTER-Kislovodsk | (07h 40m 42.00s , +51d 55m 13.4s) | C | 130 | 15.8 |\n 117523 | 2023-08-18 22:55:56 | MASTER-Kislovodsk | (07h 10m 31.31s , +50d 35m 24.8s) | C | 60 | 17.1 |\n 117523 | 2023-08-18 22:55:56 | MASTER-Kislovodsk | (07h 16m 47.71s , +50d 11m 52.6s) | C | 60 | 17.2 |\n 117884 | 2023-08-18 23:01:57 | MASTER-Kislovodsk | (07h 10m 38.53s , +50d 37m 26.1s) | C | 60 | 17.2 |\n 117884 | 2023-08-18 23:01:57 | MASTER-Kislovodsk | (07h 16m 49.66s , +50d 13m 06.0s) | C | 60 | 18.0 |\n 118666 | 2023-08-18 23:14:59 | MASTER-Kislovodsk | (07h 10m 40.32s , +50d 36m 22.2s) | C | 60 | 17.2 |\n 120068 | 2023-08-18 23:38:12 | MASTER-Kislovodsk | (06h 37m 26.81s , +35d 17m 51.2s) | C | 80 | 17.2 |\n 120178 | 2023-08-18 23:38:12 | MASTER-Kislovodsk | (06h 37m 26.81s , +35d 17m 51.2s) | C | 300 | 18.2 | Coadd\n 120068 | 2023-08-18 23:38:12 | MASTER-Kislovodsk | (06h 42m 06.50s , +34d 55m 52.2s) | C | 80 | 16.3 |\n 120179 | 2023-08-18 23:39:52 | MASTER-Kislovodsk | (06h 37m 32.83s , +35d 16m 47.4s) | C | 100 | 17.6 |\n 120179 | 2023-08-18 23:39:52 | MASTER-Kislovodsk | (06h 42m 12.51s , +34d 54m 30.9s) | C | 100 | 17.2 |\n 120309 | 2023-08-18 23:41:52 | MASTER-Kislovodsk | (06h 37m 27.81s , +35d 15m 48.8s) | C | 120 | 17.8 |\n 120309 | 2023-08-18 23:41:52 | MASTER-Kislovodsk | (06h 42m 07.54s , +34d 53m 22.0s) | C | 120 | 18.0 |\n 120464 | 2023-08-18 23:44:12 | MASTER-Kislovodsk | (06h 37m 33.76s , +35d 15m 57.1s) | C | 150 | 17.9 |\n 120464 | 2023-08-18 23:44:12 | MASTER-Kislovodsk | (06h 42m 13.65s , +34d 53m 24.8s) | C | 150 | 18.2 |\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDA4NzkwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.B9RC8xwS7f8zb6QIxNdrnz5VqIs3BsyIFYH-FA8G3cE\n\n",
"published": "2023-08-19T01:33:15.923371Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-19T01:33:15.923387Z",
"modified": "2023-08-19T01:33:15.927475Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2211,
"topic": "gcn.circular",
"uuid": "b1ba3e7f-8f37-4545-8708-fb2c791b1d03",
"title": "Fermi GRB 230818A: 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": "23/08/19 01:33:49 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34482",
"subject": "Fermi GRB 230818A: 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) started inspect of the Fermi GRB 230818A ( Fermi GBM team, GCN 34478) errorbox 2 sec after notice time and 36 sec after trigger time at 2023-08-18 23:28:11 UT, with upper limit up to 19.1 mag. The observations began at zenith distance = 48 deg. The sun altitude is -28.4 deg.\n\nMASTER-OAFA robotic telescope located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 230818A errorbox 5 sec after notice time and 38 sec after trigger time at 2023-08-18 23:28:14 UT, with upper limit up to 18.1 mag. The observations began at zenith distance = 79 deg. The sun altitude is -17.2 deg.\n\nMASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 230818A errorbox 7 sec after notice time and 40 sec after trigger time at 2023-08-18 23:28:15 UT, with upper limit up to 19.2 mag. The observations began at zenith distance = 54 deg. The sun altitude is -26.2 deg.\n\nThe galactic latitude b = 13 deg., longitude l = 73 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"56099\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 41 | 2023-08-18 23:28:11 | MASTER-Tavrida | (19h 04m 27.69s , +40d 41m 46.2s) | C | 10 | 17.3 |\n 44 | 2023-08-18 23:28:14 | MASTER-OAFA | (19h 02m 32.62s , +40d 55m 41.9s) | C | 10 | 15.8 |\n 89 | 2023-08-18 23:28:14 | MASTER-OAFA | (19h 02m 32.61s , +40d 55m 41.9s) | C | 100 | 17.1 | Coadd\n 189 | 2023-08-18 23:28:14 | MASTER-OAFA | (19h 02m 32.61s , +40d 55m 41.9s) | C | 300 | 17.6 | Coadd\n 189 | 2023-08-18 23:28:14 | MASTER-OAFA | (19h 02m 32.61s , +40d 55m 41.9s) | C | 300 | 17.6 | Coadd\n 46 | 2023-08-18 23:28:15 | MASTER-Kislovodsk | (19h 03m 26.12s , +40d 50m 05.7s) | P- | 10 | 14.2 |\n 46 | 2023-08-18 23:28:15 | MASTER-Kislovodsk | (19h 03m 25.92s , +41d 13m 18.9s) | P| | 10 | 16.4 |\n 56 | 2023-08-18 23:28:15 | MASTER-Kislovodsk | (19h 03m 25.92s , +41d 13m 18.9s) | P| | 30 | 17.1 | Coadd\n 166 | 2023-08-18 23:28:15 | MASTER-Kislovodsk | (19h 03m 25.91s , +41d 13m 18.9s) | P| | 250 | 18.5 | Coadd\n 58 | 2023-08-18 23:28:28 | MASTER-Tavrida | (19h 04m 22.05s , +40d 40m 49.5s) | C | 10 | 17.9 |\n 64 | 2023-08-18 23:28:33 | MASTER-Kislovodsk | (19h 03m 23.93s , +40d 51m 33.7s) | P- | 10 | 14.2 |\n 64 | 2023-08-18 23:28:33 | MASTER-Kislovodsk | (19h 03m 23.75s , +41d 14m 47.2s) | P| | 10 | 16.5 |\n 75 | 2023-08-18 23:28:45 | MASTER-Tavrida | (19h 04m 22.15s , +40d 41m 48.6s) | C | 10 | 18.0 |\n 81 | 2023-08-18 23:28:51 | MASTER-Kislovodsk | (19h 03m 23.92s , +40d 50m 10.0s) | P- | 10 | 14.5 |\n 82 | 2023-08-18 23:28:51 | MASTER-Kislovodsk | (19h 03m 23.78s , +41d 13m 23.0s) | P| | 10 | 16.5 |\n 98 | 2023-08-18 23:29:02 | MASTER-Tavrida | (19h 04m 27.53s , +40d 40m 46.6s) | C | 20 | 18.3 |\n 94 | 2023-08-18 23:29:03 | MASTER-OAFA | (19h 02m 38.15s , +40d 54m 46.1s) | C | 10 | 15.6 |\n 104 | 2023-08-18 23:29:09 | MASTER-Kislovodsk | (19h 03m 26.06s , +40d 51m 22.5s) | P- | 20 | 16.0 |\n 104 | 2023-08-18 23:29:09 | MASTER-Kislovodsk | (19h 03m 25.95s , +41d 14m 36.8s) | P| | 20 | 17.2 |\n 129 | 2023-08-18 23:29:09 | MASTER-Kislovodsk | (19h 03m 25.95s , +41d 14m 36.8s) | P| | 70 | 17.8 | Coadd\n 125 | 2023-08-18 23:29:30 | MASTER-Tavrida | (19h 04m 22.51s , +40d 39m 45.1s) | C | 20 | 18.3 |\n 133 | 2023-08-18 23:29:38 | MASTER-Kislovodsk | (19h 03m 20.94s , +40d 50m 50.5s) | P- | 20 | 16.0 |\n 133 | 2023-08-18 23:29:38 | MASTER-Kislovodsk | (19h 03m 20.93s , +41d 14m 04.7s) | P| | 20 | 17.0 |\n 150 | 2023-08-18 23:29:50 | MASTER-OAFA | (19h 02m 33.15s , +40d 53m 48.4s) | C | 30 | 16.2 |\n 150 | 2023-08-18 23:29:50 | MASTER-OAFA | (19h 02m 33.15s , +40d 53m 48.4s) | C | 30 | 16.2 |\n 158 | 2023-08-18 23:29:57 | MASTER-Tavrida | (19h 04m 27.91s , +40d 39m 58.3s) | C | 30 | 18.4 |\n 166 | 2023-08-18 23:30:06 | MASTER-Kislovodsk | (19h 03m 20.88s , +40d 51m 47.9s) | P- | 30 | 16.1 |\n 166 | 2023-08-18 23:30:06 | MASTER-Kislovodsk | (19h 03m 20.92s , +41d 15m 01.9s) | P| | 30 | 17.5 |\n 200 | 2023-08-18 23:30:35 | MASTER-Tavrida | (19h 04m 25.14s , +40d 41m 36.2s) | C | 40 | 18.6 |\n 209 | 2023-08-18 23:30:44 | MASTER-Kislovodsk | (19h 03m 26.59s , +40d 50m 47.8s) | P- | 40 | 16.1 |\n 209 | 2023-08-18 23:30:44 | MASTER-Kislovodsk | (19h 03m 26.71s , +41d 14m 01.5s) | P| | 40 | 17.7 |\n 264 | 2023-08-18 23:30:44 | MASTER-Kislovodsk | (19h 03m 26.70s , +41d 14m 01.5s) | P| | 150 | 18.3 | Coadd\n 225 | 2023-08-18 23:31:00 | MASTER-OAFA | (19h 02m 39.38s , +40d 53m 58.2s) | C | 40 | 16.6 |\n 225 | 2023-08-18 23:31:00 | MASTER-OAFA | (19h 02m 39.38s , +40d 53m 58.2s) | C | 40 | 16.6 |\n 252 | 2023-08-18 23:31:22 | MASTER-Tavrida | (19h 04m 25.14s , +40d 39m 55.8s) | C | 50 | 18.6 |\n 262 | 2023-08-18 23:31:32 | MASTER-Kislovodsk | (19h 03m 20.78s , +40d 49m 45.3s) | P- | 50 | 16.2 |\n 262 | 2023-08-18 23:31:32 | MASTER-Kislovodsk | (19h 03m 21.04s , +41d 12m 58.3s) | P| | 50 | 17.8 |\n 289 | 2023-08-18 23:31:59 | MASTER-OAFA | (19h 02m 35.47s , +40d 55m 39.5s) | C | 50 | 16.8 |\n 289 | 2023-08-18 23:31:59 | MASTER-OAFA | (19h 02m 35.47s , +40d 55m 39.5s) | C | 50 | 16.8 |\n 315 | 2023-08-18 23:32:20 | MASTER-Tavrida | (19h 04m 28.52s , +40d 41m 33.0s) | C | 60 | 18.8 |\n 325 | 2023-08-18 23:32:30 | MASTER-Kislovodsk | (19h 03m 25.74s , +40d 50m 06.7s) | P- | 60 | 16.2 |\n 325 | 2023-08-18 23:32:30 | MASTER-Kislovodsk | (19h 03m 26.12s , +41d 13m 19.2s) | P| | 60 | 17.9 |\n 387 | 2023-08-18 23:33:27 | MASTER-Tavrida | (19h 04m 22.43s , +40d 40m 31.1s) | C | 70 | 18.9 |\n 389 | 2023-08-18 23:33:29 | MASTER-OAFA | (19h 02m 35.66s , +40d 54m 01.9s) | C | 70 | 16.8 |\n 389 | 2023-08-18 23:33:29 | MASTER-OAFA | (19h 02m 35.66s , +40d 54m 01.9s) | C | 70 | 16.8 |\n 398 | 2023-08-18 23:33:38 | MASTER-Kislovodsk | (19h 04m 24.74s , +41d 13m 15.6s) | P| | 70 | 12.3 |\n 475 | 2023-08-18 23:34:45 | MASTER-Tavrida | (19h 04m 21.84s , +40d 41m 27.3s) | C | 90 | 19.0 |\n 489 | 2023-08-18 23:34:59 | MASTER-OAFA | (19h 02m 39.29s , +40d 55m 39.9s) | C | 90 | 17.0 |\n 489 | 2023-08-18 23:34:59 | MASTER-OAFA | (19h 02m 39.29s , +40d 55m 39.9s) | C | 90 | 17.0 |\n 534 | 2023-08-18 23:34:59 | MASTER-OAFA | (19h 02m 39.29s , +40d 55m 39.8s) | C | 180 | 17.3 | Coadd\n 585 | 2023-08-18 23:36:24 | MASTER-Tavrida | (19h 04m 27.65s , +40d 40m 22.8s) | C | 110 | 19.0 |\n 628 | 2023-08-18 23:37:08 | MASTER-OAFA | (19h 02m 31.74s , +40d 54m 56.2s) | C | 110 | 17.2 |\n 628 | 2023-08-18 23:37:08 | MASTER-OAFA | (19h 02m 31.74s , +40d 54m 56.2s) | C | 110 | 17.2 |\n 712 | 2023-08-18 23:38:22 | MASTER-Tavrida | (19h 04m 22.34s , +40d 39m 18.4s) | C | 130 | 19.0 |\n 773 | 2023-08-18 23:39:18 | MASTER-OAFA | (19h 02m 32.53s , +40d 55m 57.9s) | C | 140 | 17.1 |\n 867 | 2023-08-18 23:40:42 | MASTER-Tavrida | (19h 04m 28.58s , +40d 39m 31.5s) | C | 160 | 19.1 |\n 967 | 2023-08-18 23:42:17 | MASTER-OAFA | (19h 02m 38.09s , +40d 54m 58.5s) | C | 170 | 17.3 |\n 1045 | 2023-08-18 23:43:30 | MASTER-Tavrida | (19h 04m 25.91s , +40d 41m 04.7s) | C | 180 | 19.1 |\n 1162 | 2023-08-18 23:45:27 | MASTER-OAFA | (19h 02m 31.91s , +40d 54m 00.8s) | C | 180 | 16.8 |\n 1233 | 2023-08-18 23:46:38 | MASTER-Tavrida | (19h 04m 26.01s , +40d 39m 01.5s) | C | 180 | 19.1 |\n 1258 | 2023-08-18 23:47:03 | MASTER-Kislovodsk | (19h 03m 21.94s , +40d 53m 32.1s) | C | 180 | 16.6 |\n 1258 | 2023-08-18 23:47:03 | MASTER-Kislovodsk | (19h 03m 26.43s , +41d 17m 09.3s) | C | 180 | 18.1 |\n 1423 | 2023-08-18 23:49:48 | MASTER-Tavrida | (19h 04m 29.85s , +40d 40m 44.6s) | C | 180 | 19.0 |\n 1459 | 2023-08-18 23:50:23 | MASTER-Kislovodsk | (19h 03m 21.84s , +40d 51m 33.0s) | C | 180 | 18.1 |\n 1639 | 2023-08-18 23:50:23 | MASTER-Kislovodsk | (19h 03m 21.84s , +40d 51m 33.0s) | C | 540 | 18.8 | Coadd\n 1459 | 2023-08-18 23:50:23 | MASTER-Kislovodsk | (19h 03m 26.64s , +41d 15m 12.7s) | C | 180 | 18.5 |\n 1612 | 2023-08-18 23:52:57 | MASTER-Tavrida | (19h 04m 22.42s , +40d 39m 49.1s) | C | 180 | 19.1 |\n 1659 | 2023-08-18 23:53:44 | MASTER-Kislovodsk | (19h 03m 24.49s , +40d 53m 10.0s) | C | 180 | 18.2 |\n 1659 | 2023-08-18 23:53:44 | MASTER-Kislovodsk | (19h 03m 29.72s , +41d 16m 49.4s) | C | 180 | 18.5 |\n 1839 | 2023-08-18 23:53:44 | MASTER-Kislovodsk | (19h 03m 29.72s , +41d 16m 49.2s) | C | 540 | 19.2 | Coadd\n 1802 | 2023-08-18 23:56:06 | MASTER-Tavrida | (19h 04m 24.04s , +40d 40m 43.5s) | C | 180 | 19.0 |\n 1991 | 2023-08-18 23:59:16 | MASTER-Tavrida | (19h 04m 30.28s , +40d 39m 37.6s) | C | 180 | 19.0 |\n 2066 | 2023-08-19 00:00:31 | MASTER-Kislovodsk | (19h 03m 19.42s , +40d 53m 01.7s) | C | 180 | 18.3 |\n 2066 | 2023-08-19 00:00:31 | MASTER-Kislovodsk | (19h 03m 25.40s , +41d 16m 38.0s) | C | 180 | 18.6 |\n 2181 | 2023-08-19 00:02:26 | MASTER-Tavrida | (19h 04m 23.56s , +40d 38m 32.6s) | C | 180 | 19.0 |\n 2267 | 2023-08-19 00:03:52 | MASTER-Kislovodsk | (19h 03m 24.05s , +40d 51m 55.1s) | C | 180 | 18.3 |\n 2447 | 2023-08-19 00:03:52 | MASTER-Kislovodsk | (19h 03m 24.02s , +40d 51m 55.0s) | C | 540 | 18.3 | Coadd\n 2267 | 2023-08-19 00:03:52 | MASTER-Kislovodsk | (19h 03m 30.34s , +41d 15m 31.0s) | C | 180 | 18.7 |\n 2371 | 2023-08-19 00:05:36 | MASTER-Tavrida | (19h 04m 29.48s , +40d 38m 45.7s) | C | 180 | 19.0 |\n 2553 | 2023-08-19 00:08:38 | MASTER-Kislovodsk | (19h 03m 26.78s , +40d 51m 59.9s) | P- | 180 | 17.1 |\n 2553 | 2023-08-19 00:08:38 | MASTER-Kislovodsk | (19h 03m 33.03s , +41d 15m 28.9s) | P| | 180 | 18.1 |\n 2733 | 2023-08-19 00:08:38 | MASTER-Kislovodsk | (19h 03m 33.03s , +41d 15m 28.9s) | P| | 540 | 18.7 | Coadd\n 2560 | 2023-08-19 00:08:45 | MASTER-Tavrida | (19h 04m 27.19s , +40d 40m 02.0s) | C | 180 | 18.9 |\n 2642 | 2023-08-19 00:10:07 | MASTER-OAFA | (19h 02m 31.47s , +40d 55m 53.4s) | C | 180 | 17.6 |\n 2748 | 2023-08-19 00:11:53 | MASTER-Tavrida | (19h 04m 27.32s , +40d 38m 25.3s) | C | 180 | 18.9 |\n 2753 | 2023-08-19 00:11:58 | MASTER-Kislovodsk | (19h 03m 23.68s , +40d 53m 29.5s) | P- | 180 | 17.2 |\n 2753 | 2023-08-19 00:11:58 | MASTER-Kislovodsk | (19h 03m 30.38s , +41d 16m 58.6s) | P| | 180 | 18.2 |\n 2877 | 2023-08-19 00:14:02 | MASTER-OAFA | (19h 02m 37.86s , +40d 54m 57.1s) | C | 180 | 17.8 |\n 2936 | 2023-08-19 00:15:01 | MASTER-Tavrida | (19h 04m 30.09s , +40d 39m 46.5s) | C | 180 | 18.8 |\n 2954 | 2023-08-19 00:15:19 | MASTER-Kislovodsk | (19h 03m 23.50s , +40d 51m 43.7s) | P- | 180 | 17.0 |\n 3134 | 2023-08-19 00:15:19 | MASTER-Kislovodsk | (19h 03m 23.50s , +40d 51m 43.6s) | P- | 540 | 17.6 | Coadd\n 2954 | 2023-08-19 00:15:19 | MASTER-Kislovodsk | (19h 03m 30.67s , +41d 15m 13.6s) | P| | 180 | 18.2 |\n 3114 | 2023-08-19 00:17:59 | MASTER-OAFA | (19h 02m 31.97s , +40d 53m 59.3s) | C | 180 | 17.9 |\n 3123 | 2023-08-19 00:18:08 | MASTER-Tavrida | (19h 04m 24.56s , +40d 39m 05.8s) | C | 180 | 18.8 |\n 3155 | 2023-08-19 00:18:39 | MASTER-Kislovodsk | (19h 03m 26.10s , +40d 53m 01.5s) | P- | 180 | 17.1 |\n 3155 | 2023-08-19 00:18:39 | MASTER-Kislovodsk | (19h 03m 33.83s , +41d 16m 32.2s) | P| | 180 | 18.1 |\n 3335 | 2023-08-19 00:18:39 | MASTER-Kislovodsk | (19h 03m 33.83s , +41d 16m 32.3s) | P| | 540 | 18.6 | Coadd\n 3311 | 2023-08-19 00:21:15 | MASTER-Tavrida | (19h 04m 24.82s , +40d 40m 00.4s) | C | 180 | 18.7 |\n 3355 | 2023-08-19 00:22:00 | MASTER-Kislovodsk | (19h 03m 19.81s , +40d 52m 23.1s) | P- | 180 | 17.0 |\n 3355 | 2023-08-19 00:22:00 | MASTER-Kislovodsk | (19h 03m 28.06s , +41d 15m 54.1s) | P| | 180 | 18.1 |\n 3498 | 2023-08-19 00:24:23 | MASTER-Tavrida | (19h 04m 31.83s , +40d 38m 54.8s) | C | 180 | 18.6 |\n 3516 | 2023-08-19 00:24:41 | MASTER-OAFA | (19h 02m 34.21s , +40d 55m 52.1s) | C | 180 | 17.8 |\n 3516 | 2023-08-19 00:24:41 | MASTER-OAFA | (19h 02m 34.21s , +40d 55m 52.1s) | C | 180 | 17.8 |\n 3555 | 2023-08-19 00:25:20 | MASTER-Kislovodsk | (19h 03m 18.96s , +40d 53m 14.5s) | P- | 180 | 17.0 |\n 3735 | 2023-08-19 00:25:20 | MASTER-Kislovodsk | (19h 03m 18.96s , +40d 53m 14.5s) | P- | 540 | 17.5 | Coadd\n 3555 | 2023-08-19 00:25:20 | MASTER-Kislovodsk | (19h 03m 27.59s , +41d 16m 45.5s) | P| | 180 | 18.0 |\n 3686 | 2023-08-19 00:27:31 | MASTER-Tavrida | (19h 04m 26.57s , +40d 37m 50.4s) | C | 180 | 18.6 |\n 3715 | 2023-08-19 00:28:00 | MASTER-OAFA | (19h 02m 34.00s , +40d 54m 26.3s) | C | 180 | 17.9 |\n 3715 | 2023-08-19 00:28:00 | MASTER-OAFA | (19h 02m 34.00s , +40d 54m 26.3s) | C | 180 | 17.9 |\n 3756 | 2023-08-19 00:28:41 | MASTER-Kislovodsk | (19h 03m 25.70s , +40d 52m 09.0s) | P- | 180 | 17.0 |\n 3756 | 2023-08-19 00:28:41 | MASTER-Kislovodsk | (19h 03m 34.73s , +41d 15m 39.4s) | P| | 180 | 18.0 |\n 3936 | 2023-08-19 00:28:41 | MASTER-Kislovodsk | (19h 03m 34.73s , +41d 15m 39.4s) | P| | 540 | 18.5 | Coadd\n 3877 | 2023-08-19 00:30:42 | MASTER-Tavrida | (19h 04m 31.80s , +40d 37m 54.0s) | C | 180 | 18.6 |\n 3956 | 2023-08-19 00:32:01 | MASTER-Kislovodsk | (19h 03m 19.48s , +40d 51m 00.6s) | P- | 180 | 17.0 |\n 3956 | 2023-08-19 00:32:01 | MASTER-Kislovodsk | (19h 03m 28.95s , +41d 14m 31.0s) | P| | 180 | 18.0 |\n 3989 | 2023-08-19 00:32:33 | MASTER-OAFA | (19h 02m 36.07s , +40d 55m 58.0s) | C | 180 | 17.5 |\n 3989 | 2023-08-19 00:32:33 | MASTER-OAFA | (19h 02m 36.07s , +40d 55m 58.0s) | C | 180 | 17.5 |\n 4034 | 2023-08-19 00:33:19 | MASTER-OAFA | (19h 02m 37.30s , +40d 55m 01.6s) | C | 180 | 17.0 |\n 4034 | 2023-08-19 00:33:19 | MASTER-OAFA | (19h 02m 37.30s , +40d 55m 01.6s) | C | 180 | 17.0 |\n 4066 | 2023-08-19 00:33:51 | MASTER-Tavrida | (19h 04m 28.83s , +40d 39m 32.6s) | C | 180 | 18.6 |\n 4157 | 2023-08-19 00:35:22 | MASTER-Kislovodsk | (19h 03m 25.50s , +40d 51m 05.7s) | P- | 180 | 17.0 |\n 4337 | 2023-08-19 00:35:22 | MASTER-Kislovodsk | (19h 03m 25.50s , +40d 51m 05.7s) | P- | 540 | 17.6 | Coadd\n 4157 | 2023-08-19 00:35:22 | MASTER-Kislovodsk | (19h 03m 35.40s , +41d 14m 36.0s) | P| | 180 | 18.0 |\n 4254 | 2023-08-19 00:36:59 | MASTER-Tavrida | (19h 04m 28.96s , +40d 37m 36.7s) | C | 180 | 18.6 |\n 4357 | 2023-08-19 00:38:42 | MASTER-Kislovodsk | (19h 03m 22.52s , +40d 52m 38.1s) | P- | 180 | 17.0 |\n 4357 | 2023-08-19 00:38:42 | MASTER-Kislovodsk | (19h 03m 32.76s , +41d 16m 08.7s) | P| | 180 | 18.0 |\n 4537 | 2023-08-19 00:38:42 | MASTER-Kislovodsk | (19h 03m 32.76s , +41d 16m 08.7s) | P| | 540 | 18.6 | Coadd\n 4441 | 2023-08-19 00:40:06 | MASTER-Tavrida | (19h 04m 32.13s , +40d 39m 19.8s) | C | 180 | 18.5 |\n 4558 | 2023-08-19 00:42:03 | MASTER-Kislovodsk | (19h 03m 22.46s , +40d 51m 03.8s) | P- | 180 | 17.1 |\n 4558 | 2023-08-19 00:42:03 | MASTER-Kislovodsk | (19h 03m 33.07s , +41d 14m 34.4s) | P| | 180 | 18.0 |\n 4629 | 2023-08-19 00:43:14 | MASTER-Tavrida | (19h 04m 27.31s , +40d 38m 24.6s) | C | 180 | 18.5 |\n 4662 | 2023-08-19 00:43:47 | MASTER-OAFA | (19h 02m 35.32s , +40d 55m 01.3s) | C | 180 | 17.7 |\n 4662 | 2023-08-19 00:43:47 | MASTER-OAFA | (19h 02m 35.32s , +40d 55m 01.3s) | C | 180 | 17.7 |\n 4758 | 2023-08-19 00:45:23 | MASTER-Kislovodsk | (19h 03m 25.24s , +40d 52m 27.5s) | P- | 180 | 17.0 |\n 4938 | 2023-08-19 00:45:23 | MASTER-Kislovodsk | (19h 03m 25.24s , +40d 52m 27.5s) | P- | 540 | 17.5 | Coadd\n 4758 | 2023-08-19 00:45:23 | MASTER-Kislovodsk | (19h 03m 36.19s , +41d 15m 58.0s) | P| | 180 | 18.0 |\n 4820 | 2023-08-19 00:46:25 | MASTER-Tavrida | (19h 04m 26.18s , +40d 39m 19.5s) | C | 180 | 18.6 |\n 4947 | 2023-08-19 00:48:32 | MASTER-OAFA | (19h 02m 35.77s , +40d 54m 19.3s) | C | 180 | 16.8 |\n 4947 | 2023-08-19 00:48:32 | MASTER-OAFA | (19h 02m 35.77s , +40d 54m 19.3s) | C | 180 | 16.8 |\n 4959 | 2023-08-19 00:48:44 | MASTER-Kislovodsk | (19h 03m 18.30s , +40d 51m 25.8s) | P- | 180 | 17.0 |\n 4959 | 2023-08-19 00:48:44 | MASTER-Kislovodsk | (19h 03m 29.69s , +41d 14m 55.6s) | P| | 180 | 18.0 |\n 5139 | 2023-08-19 00:48:44 | MASTER-Kislovodsk | (19h 03m 29.69s , +41d 14m 55.6s) | P| | 540 | 18.4 | Coadd\n 5007 | 2023-08-19 00:49:32 | MASTER-Tavrida | (19h 04m 32.82s , +40d 38m 14.5s) | C | 180 | 18.5 |\n 5195 | 2023-08-19 00:52:39 | MASTER-Tavrida | (19h 04m 27.62s , +40d 37m 10.2s) | C | 180 | 18.5 |\n 5360 | 2023-08-19 00:55:25 | MASTER-Kislovodsk | (19h 03m 24.81s , +40d 51m 11.9s) | P- | 180 | 16.9 |\n 5360 | 2023-08-19 00:55:25 | MASTER-Kislovodsk | (19h 03m 36.96s , +41d 14m 41.4s) | P| | 180 | 17.8 |\n 5385 | 2023-08-19 00:55:50 | MASTER-Tavrida | (19h 04m 33.92s , +40d 37m 26.2s) | C | 180 | 18.6 |\n 5560 | 2023-08-19 00:58:45 | MASTER-Kislovodsk | (19h 03m 17.85s , +40d 50m 03.1s) | P- | 180 | 17.0 |\n 5740 | 2023-08-19 00:58:45 | MASTER-Kislovodsk | (19h 03m 17.85s , +40d 50m 03.1s) | P- | 540 | 17.3 | Coadd\n 5560 | 2023-08-19 00:58:45 | MASTER-Kislovodsk | (19h 03m 30.45s , +41d 13m 33.0s) | P| | 180 | 17.8 |\n 5573 | 2023-08-19 00:58:58 | MASTER-Tavrida | (19h 04m 30.63s , +40d 38m 50.1s) | C | 180 | 18.5 |\n 5761 | 2023-08-19 01:02:05 | MASTER-Kislovodsk | (19h 03m 24.65s , +40d 50m 08.8s) | P- | 180 | 16.8 |\n 5761 | 2023-08-19 01:02:06 | MASTER-Kislovodsk | (19h 03m 37.62s , +41d 13m 38.4s) | P| | 180 | 17.6 |\n 5941 | 2023-08-19 01:02:06 | MASTER-Kislovodsk | (19h 03m 37.62s , +41d 13m 38.4s) | P| | 540 | 18.1 | Coadd\n 5761 | 2023-08-19 01:02:06 | MASTER-Tavrida | (19h 04m 30.82s , +40d 37m 18.8s) | C | 180 | 18.5 |\n 5840 | 2023-08-19 01:03:25 | MASTER-OAFA | (19h 02m 28.43s , +40d 55m 54.7s) | C | 180 | 17.9 |\n 5840 | 2023-08-19 01:03:25 | MASTER-OAFA | (19h 02m 28.43s , +40d 55m 54.7s) | C | 180 | 17.9 |\n 5949 | 2023-08-19 01:05:14 | MASTER-Tavrida | (19h 04m 34.73s , +40d 38m 37.4s) | C | 180 | 18.4 |\n 5961 | 2023-08-19 01:05:26 | MASTER-Kislovodsk | (19h 03m 21.57s , +40d 51m 24.2s) | P- | 180 | 16.7 |\n 5961 | 2023-08-19 01:05:26 | MASTER-Kislovodsk | (19h 03m 34.90s , +41d 14m 54.1s) | P| | 180 | 17.5 |\n 6082 | 2023-08-19 01:07:26 | MASTER-OAFA | (19h 02m 34.34s , +40d 54m 53.2s) | C | 180 | 18.0 |\n 6082 | 2023-08-19 01:07:26 | MASTER-OAFA | (19h 02m 34.34s , +40d 54m 53.2s) | C | 180 | 18.0 |\n 6139 | 2023-08-19 01:08:24 | MASTER-Tavrida | (19h 04m 28.83s , +40d 37m 45.8s) | C | 180 | 18.4 |\n 6162 | 2023-08-19 01:08:47 | MASTER-Kislovodsk | (19h 03m 35.31s , +41d 13m 27.2s) | P| | 180 | 17.3 |\n 6162 | 2023-08-19 01:08:47 | MASTER-Kislovodsk | (19h 03m 21.57s , +40d 49m 57.6s) | P- | 180 | 16.6 |\n 6301 | 2023-08-19 01:11:06 | MASTER-OAFA | (19h 02m 28.75s , +40d 53m 52.5s) | C | 180 | 18.0 |\n 6326 | 2023-08-19 01:11:31 | MASTER-Tavrida | (19h 04m 29.40s , +40d 38m 41.0s) | C | 180 | 18.4 |\n 6362 | 2023-08-19 01:12:07 | MASTER-Kislovodsk | (19h 03m 23.15s , +40d 51m 24.1s) | P- | 180 | 16.2 |\n 6362 | 2023-08-19 01:12:07 | MASTER-Kislovodsk | (19h 03m 37.34s , +41d 14m 54.1s) | P| | 180 | 16.9 |\n 6516 | 2023-08-19 01:14:41 | MASTER-Tavrida | (19h 04m 35.04s , +40d 37m 36.4s) | C | 180 | 18.2 |\n 6521 | 2023-08-19 01:14:46 | MASTER-OAFA | (19h 02m 33.90s , +40d 54m 16.7s) | C | 180 | 18.1 |\n 6563 | 2023-08-19 01:15:27 | MASTER-Kislovodsk | (19h 03m 17.09s , +40d 50m 26.2s) | P- | 180 | 16.0 |\n 6563 | 2023-08-19 01:15:28 | MASTER-Kislovodsk | (19h 03m 31.77s , +41d 13m 56.3s) | P| | 180 | 16.5 |\n 6707 | 2023-08-19 01:17:52 | MASTER-Tavrida | (19h 04m 29.10s , +40d 36m 31.7s) | C | 180 | 18.2 |\n 6897 | 2023-08-19 01:21:02 | MASTER-Tavrida | (19h 04m 35.81s , +40d 36m 39.4s) | C | 180 | 18.1 |\n 7088 | 2023-08-19 01:24:13 | MASTER-Tavrida | (19h 04m 32.58s , +40d 38m 07.9s) | C | 180 | 18.1 |\n 7276 | 2023-08-19 01:27:20 | MASTER-Tavrida | (19h 04m 32.71s , +40d 36m 37.4s) | C | 180 | 17.9 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDA4ODMyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.awKcaCS1q3euJzB7GtaY5n8WJyO46gXErKjDMTp94XQ\n\n",
"published": "2023-08-19T01:33:57.003620Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-19T01:33:57.003636Z",
"modified": "2023-08-19T01:33:57.008568Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2212,
"topic": "igwn.gwalert",
"uuid": "54d5ebc1-7df4-411c-a345-cb05df15835c",
"title": "S230819e - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230819e/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230819e/view/"
},
"event": {
"far": 7.10591e-06,
"time": "2023-08-19T02:56:14.262Z",
"group": "Burst",
"search": "BBH",
"area_50": 1251.3868250098499,
"area_90": 3666.8739359275887,
"duration": 0.039741,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "df24d3220eb1b2135c95a996ef40ef6b",
"classification": {},
"skymap_version": 0,
"central_frequency": 30.64312
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-19T02:59:23Z",
"superevent_id": "S230819e",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-19T02:59:23.820761Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-19T02:59:23.820791Z",
"modified": "2023-08-19T02:59:23.831336Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2213,
"topic": "igwn.gwalert",
"uuid": "03f55ecc-5a91-443a-9051-138f56bb6be9",
"title": "S230819e - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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{
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"topic": "igwn.gwalert",
"uuid": "b8f339d1-1ef4-4d13-9861-7f3cbde06194",
"title": "S230819f - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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{
"id": 2215,
"topic": "gcn.circular",
"uuid": "5417765c-a569-4d2a-8f9a-0d1ce4bbaa32",
"title": "GRB 230818A: SAO RAS Zeiss-1000 observations",
"submitter": "Hop gcn.circular",
"authors": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"data": {
"date": "23/08/19 03:12:38 GMT",
"from": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"title": "GCN CIRCULAR",
"number": "34483",
"subject": "GRB 230818A: SAO RAS Zeiss-1000 observations"
},
"message_text": "A. S. Moskvitin, D. V. Oparin, V. S. Shergin and\nV. V. Komarov (SAO RAS), report on behalf of the GRB follow-up team.\n\nWe observed the field of GRB 230818A (Fermi GBM team, 34478;\nTohuvavohu et al., GCN 34479) with the 1-m telescope of SAO RAS\nZeiss-1000 equipped with the CCD photometer. We started observations\non August 18, 23:32:18 UT (~5 minutes after the trigger) and obtained\nmultiple images in BVRcIc bands (principally in Rc).\n\nWe clearly detected the OT (Lipunov et al., GCNs 34476, 34477,\n34481, 34482; Gompertz et al., GCN 34480) in our individual\nframes with the coordinates\nR. A. (J2000) = 19:03:33.11\nDecl. (J2000) = +40:53:49.2 (+/- 0\".5)\nand the following brightness:\nUT_start exp, s t_mid-T0, h Rmag +/- err\n23:32:18 60 0.0872 17.79 +/- 0.06\n23:34:00 60 0.1156 18.07 +/- 0.06\n23:45:06 120 0.3089 19.18 +/- 0.08\n23:57:27 120 0.5147 19.68 +/- 0.10\n00:29:01 300 1.0658 20.52 +/- 0.13\n00:45:26 2 x 300 1.39333 20.48 +/- 0.09\n\nThis preliminary photometry is based on nearby USNO-B1 stars (R2 mag),\nthe magnitude is not corrected for MW extinction.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDE0NzY0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.KsTOYAhC-K8u4EblS9EHBbvGOqmRTNrk5gbeb0rIjCI\n\n",
"published": "2023-08-19T03:12:49.447136Z",
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"retracted": false,
"created": "2023-08-19T03:12:49.447151Z",
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"topic": "igwn.gwalert",
"uuid": "992854ad-dce6-4dba-9fc8-a92dfb2b6aad",
"title": "S230819f - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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{
"id": 2217,
"topic": "gcn.circular",
"uuid": "2813c9ef-8958-4d94-abd3-ba0f00b4c748",
"title": "GRB 230818A: Enhanced Swift-XRT position",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/08/19 03:42:13 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34484",
"subject": "GRB 230818A: Enhanced Swift-XRT position"
},
"message_text": "M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester)\nreport on behalf of the Swift-XRT team.\n\nUsing 1669 s of XRT Photon Counting mode data and 3 UVOT\nimages for GRB 230818A, we find an astrometrically corrected X-ray\nposition (using the XRT-UVOT alignment and matching UVOT field sources\nto the USNO-B1 catalogue): RA, Dec = 285.88784, +40.89668 which is equivalent\nto:\n\nRA (J2000): 19h 03m 33.08s\nDec (J2000): +40d 53' 48.0\"\n\nwith an uncertainty of 2.2 arcsec (radius, 90% confidence).\n\nThis position may be improved as more data are received. The latest\nposition can be viewed at http://www.swift.ac.uk/xrt_positions. Position\nenhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans\net al. (2009, MNRAS, 397, 1177).\n\nThis circular was automatically generated, and is an official product of the\nSwift-XRT team.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDE2NTM5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.52-BPj2Bs-_uU5mVQk4oZUcLCoje24fN51_NcUvpU4c\n\n",
"published": "2023-08-19T03:42:24.465319Z",
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"retracted": false,
"created": "2023-08-19T03:42:24.465338Z",
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"title": "S230819h - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
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"published": "2023-08-19T03:58:37.392324Z",
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"topic": "igwn.gwalert",
"uuid": "fa32b650-1b61-4030-93c2-1295af8c2bb7",
"title": "S230819h - PRELIMINARY",
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"data": {
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"topic": "igwn.gwalert",
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"title": "S230819m - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
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"data": {
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"published": "2023-08-19T05:05:58.815483Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-19T05:05:58.815503Z",
"modified": "2023-08-19T05:05:58.820430Z",
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{
"id": 2221,
"topic": "igwn.gwalert",
"uuid": "592fdf82-5bf3-4135-9cd2-1e1a2475cdd0",
"title": "S230819m - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"sequence_num": 2,
"time_created": "2023-08-19T05:10:32Z",
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{
"id": 2222,
"topic": "gcn.circular",
"uuid": "47fa6393-312f-4f78-95e0-c48c25d9de04",
"title": "GRB 230818A: NOT photometry and spectroscopy",
"submitter": "Hop gcn.circular",
"authors": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
"data": {
"date": "23/08/19 06:20:27 GMT",
"from": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
"title": "GCN CIRCULAR",
"number": "34485",
"subject": "GRB 230818A: NOT photometry and spectroscopy"
},
"message_text": "D.B. Malesani (Radboud and DAWN/NBI), D. Xu, S.Q. Jiang, T.H. Lu, Z.P. Zhu (NAOC), J.P.U Fynbo (DAWN/NBI), L. Izzo, (INAF-OACN & DAWN/NBI), Z. Gray (NOT) report:\n\nWe observed the optical counterpart (Lipunov et al., GCN 34476; Gompertz et al., GCN 34480) of GRB 230818A detected by Fermi/GBM (Fermi/GBM team, GCN 34478) and Swift/BAT (Tohuvavohu et al., GCN 34479), using the 2.56-m Nordic Optical Telescope (NOT) equipped with the ALFOSC camera.\n\nObservations started at 23:53:33 UT on 2023-08-18, i.e., 26 min post-burst, and 2x1200 s spectra were obtained, with a spectral coverage of 3600 - 9500 AA.\n\nThe spectrum shows a trace throughout the whole range, with a broad absorption feature at ~ 4150 AA, which can be interpreted as Lya at z~2.4. Redward several prominent absorption features are present, which can be interpreted as due to Si II, O I, C II, Si IV, C IV, Ni II, Fe II at a common redshift of z = 2.42, being consistent with the Lya feature. We thus think this is the redshift of the burst.\n\nAfter the spectroscopy, an 150 s exposure in the Sloan i-band was obtained. We measured m(i) = 20.02 +/- 0.02 at 1.21 hr post-burst, calibrated with nearby SDSS stars.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDI2MDMyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.baYzAT9jAuMkXGab3qN9kw88Ew_oebeTPbAGZC7lPoE\n\n",
"published": "2023-08-19T06:20:42.294011Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-19T06:20:42.294027Z",
"modified": "2023-08-19T06:20:42.298061Z",
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},
{
"id": 2223,
"topic": "igwn.gwalert",
"uuid": "7cca94b8-35bf-4bd4-a991-7a70d8cdc136",
"title": "S230819q - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
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"data": {
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"published": "2023-08-19T06:36:34.607888Z",
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"created": "2023-08-19T06:36:34.607908Z",
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{
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"title": "S230819q - PRELIMINARY",
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"time": "2023-08-19T06:35:17.145Z",
"group": "Burst",
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"sequence_num": 2,
"time_created": "2023-08-19T06:41:07Z",
"superevent_id": "S230819q",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-19T06:41:08.224485Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-19T06:41:08.224504Z",
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{
"id": 2225,
"topic": "gcn.circular",
"uuid": "9e8f3e41-2492-4b8a-ade7-7e4846040654",
"title": "GRB 230818A: Swift/UVOT Detection",
"submitter": "Hop gcn.circular",
"authors": "Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>",
"data": {
"date": "23/08/19 07:46:57 GMT",
"from": "Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>",
"title": "GCN CIRCULAR",
"number": "34486",
"subject": "GRB 230818A: Swift/UVOT Detection"
},
"message_text": "M. H. Siegel (PSU) and A. Tohuvavohu (U. Toronto)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 230818A\n144 s after the BAT trigger (Tohuvavohu et al., GCN Circ. 34479).\nA source consistent with the optical position (Lipunov et al., GCN\nCirc. 34476) is detected in the initial UVOT exposures.\n\nThe preliminary UVOT position is:\n RA (J2000) = 19:03:33.13 = 285.88806 (deg.)\n Dec (J2000) = +40:53:49.0 = 40.89695 (deg.)\nwith an estimated uncertainty of 0.48 arc sec. (radius, 90% confidence).\n\nPreliminary detections and 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:\n\nFilter T_start(s) T_stop(s) Exp(s) Mag\n\nwhite 144 294 147 19.09 +/- 0.07\nv 379 572 39 18.40 +/- 0.30\nb 477 1513 117 19.68 +/- 0.20\nu 452 1487 117 >19.5\nw1 428 1463 97 >20.2\nw2 1026 4987 255 >20.1\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.101 in the direction of the burst\n(Schlegel et al. 1998).\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDMxMjIyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Y-GQncN9jjT4eKd5BdJBEcbJbFzWAWm-gA2yeVk4vbU\n\n",
"published": "2023-08-19T07:47:08.264737Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-19T07:47:08.264762Z",
"modified": "2023-08-19T07:47:08.268824Z",
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},
{
"id": 2226,
"topic": "gcn.circular",
"uuid": "d73015f6-facc-44cf-a17c-8705fc86d491",
"title": "GRB 230818A: KGO RC-25 optical observations",
"submitter": "Hop gcn.circular",
"authors": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"data": {
"date": "23/08/19 10:06:00 GMT",
"from": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"title": "GCN CIRCULAR",
"number": "34487",
"subject": "GRB 230818A: KGO RC-25 optical observations"
},
"message_text": "N. Pankov (HSE, IKI) A. V. Samokhvalov (citizen scientist, Surgut),\nA. Pozanenko (IKI), S. Belkin (IKI, HSE) report on behalf of GRB IKI FuN:\n\nWe observed the field of GRB 230818A (Swift: Tohuvavohu et al., GCN 34479; Fermi: GBM team, GCN 34478) with 25cm telescope of KGO observatory. Observation started on 2023-08-18 23:42:15, i.e. 14.5 minutes after GRB trigger. The series consist of images with an exposure of 600 s in R-filter. WE clearly detect the afterglow (Lipunov et al., GCN 34476; Gompertz et al., GCN 34480; Moskvitin et al., GCN 34483; Malesani et al., GCN 34485; Siegel et al., GCN 34486). Preliminary photometry of images is following\n\nDate UT-start Exptime Filter t-T0 OT Err UL\n sec days\n2023-08-18 23:42:15 1*600 R 0.013667 18.7 0.2 19.3\n2023-08-18 23:52:24 6*600 R 0.038080 19.8 0.3 19.9\n\nRef.stars\nPanSTARRS-DR1\nRA Dec r i R(Lupton transformation)\n19:03:22.0694 +40:55:31.814 14.1600 14.0074 13.97\n19:04:17.2714 +40:50:28.744 14.8986 14.7352 14.71\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDM5NTY1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.RWj4wu0iWbBhWHslO3vXSzL_CAvXfa5jMioTXOrCkwk\n\n",
"published": "2023-08-19T10:06:10.251077Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-19T10:06:10.251093Z",
"modified": "2023-08-19T10:06:10.257544Z",
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{
"id": 2227,
"topic": "igwn.gwalert",
"uuid": "ccc4387c-2151-417c-9b72-d53acb5bef9f",
"title": "S230819ad - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"published": "2023-08-19T10:19:15.188983Z",
"message_parser": "IGWN Alert Avro Parser v1",
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"created": "2023-08-19T10:19:15.189029Z",
"modified": "2023-08-19T10:19:15.192710Z",
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{
"id": 2228,
"topic": "igwn.gwalert",
"uuid": "fccba899-9e42-4a90-91fe-5a1e5d7f8695",
"title": "S230819ad - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"time_created": "2023-08-19T10:23:48Z",
"superevent_id": "S230819ad",
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},
"message_text": "",
"published": "2023-08-19T10:23:48.926893Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-19T10:23:48.926929Z",
"modified": "2023-08-19T10:23:48.931048Z",
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},
{
"id": 2229,
"topic": "igwn.gwalert",
"uuid": "9caccc5e-7280-4a39-ad1c-15fb0003f04e",
"title": "S230819at - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"event": {
"far": 1.059115948010003e-05,
"time": "2023-08-19T14:19:58.047Z",
"group": "CBC",
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"area_50": 3954.7516562350183,
"area_90": 12861.335819215923,
"duration": null,
"pipeline": "spiir",
"properties": {
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"time_created": "2023-08-19T14:20:27Z",
"superevent_id": "S230819at",
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},
"message_text": "",
"published": "2023-08-19T14:20:28.613323Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-19T14:20:28.613342Z",
"modified": "2023-08-19T14:20:28.619305Z",
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{
"id": 2230,
"topic": "igwn.gwalert",
"uuid": "0c6de0e5-9203-461d-aeca-42850843a9d9",
"title": "S230819at - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"duration": null,
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"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-19T14:25:02Z",
"superevent_id": "S230819at",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-19T14:25:03.265072Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-19T14:25:03.265098Z",
"modified": "2023-08-19T14:25:03.268619Z",
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},
{
"id": 2231,
"topic": "igwn.gwalert",
"uuid": "ce79c3c6-b242-48ef-bcdb-a1df2a5ba791",
"title": "S230819av - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"event": {
"far": 8.14865e-06,
"time": "2023-08-19T14:51:18.242Z",
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"time_created": "2023-08-19T14:55:14Z",
"superevent_id": "S230819av",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-19T14:55:15.277242Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-19T14:55:15.277275Z",
"modified": "2023-08-19T14:55:15.283257Z",
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},
{
"id": 2232,
"topic": "gcn.circular",
"uuid": "e7fb2acb-3e4c-48ed-9e33-57ed44a8c7bd",
"title": "GRB 230818A: Bassano Bresciano Observatory optical observations",
"submitter": "Hop gcn.circular",
"authors": "Ulisse Quadri at Bassano Bresciano Obs <oabb@ulisse.bs.it>",
"data": {
"date": "23/08/19 14:56:53 GMT",
"from": "Ulisse Quadri at Bassano Bresciano Obs <oabb@ulisse.bs.it>",
"title": "GCN CIRCULAR",
"number": "34488",
"subject": "GRB 230818A: Bassano Bresciano Observatory optical observations"
},
"message_text": "U.Quadri and L.Strabla (Bassano Bresciano Astronomical Observatory),\n\nMembers of:\nAAVSO - American Association of Variable Star Observers.\nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili-GRB.\nGAC - Gruppo Astrofili Cremonesi.\n\n\nWe imaged the field of GRB 230818A detected by SWIFT(trigger 1186032)\nwith the robotic telescope of (IAU station 565) Bassano Bresciano\nObservatory, Italy.\n\nThe observations started 13.61 min after the GRB trigger,\nwith our Newton automated telescope D%0 mm F/D=4.8.\n\nWeather conditions were good.\n\nWe co-added 3 series of 10 exposures of 60 sec each.\n\nWe detected afterglow in the error box of the XRTcandidate.\n(Fermi GBM team, GCN 34478; Tohuvavohu et al., GCN 34479;\nBen Gompertz et al., GCN 34480; V. Lipunov et al. GCN 34482;\nA. S. Moskvitin et al., GCN 34483; D.B. Malesani et al., GCN 34485;\nN. Pankov et al., GCN 34487) at the following position (+/- 2 arcsec):\n\nRA (J2000.0) = 19 03 33.21\nDEC(J2000.0) = +40 53 49.5\n\n\nOur photometry of the afterglow are:\n\n\nDate U.T. R mag Sigma\n------------------------------------\n2023 08 18.99405 18.90 0.07\n2023 08 19.00126 19.21 0.07\n2023 08 19.00154 19.47 0.06\n----------------------------------\n\n\nCOMPARISON STARS\n--------------------------------------------------------------------\n pan-STARRS ID g r i Rc\n--------------------------------------------------------------------\n157072858562487290 17.4025 16.7800 16.5376 16.56\n157052858895609613 16.8323 16.3279 16.1482 16.13\n157072859081709765 15.0561 14.7054 14.5820 14.53\n157092859169446573 16.9397 16.4745 16.2972 16.28\n157102858906415897 17.0217 16.4894 16.2798 16.28\n157062859601321798 15.7561 15.2872 15.0934 15.09\n--------------------------------------------------------------------\n\nMagnitudes were estimated with the Pan-STARRS cat.\nRc mag are derived using Lupton (2005) equations.\n\nNot corrected for galactic dust extinction.\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDU3MDE4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.hYRoLpu5TmiD9MTHywwCJWQ1HMeTVRKif-HzMBvFxCQ\n\n",
"published": "2023-08-19T14:57:07.485596Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-19T14:57:07.485612Z",
"modified": "2023-08-19T14:57:07.489389Z",
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},
{
"id": 2233,
"topic": "igwn.gwalert",
"uuid": "2a8354f7-7000-4676-acec-5f85b84a5e93",
"title": "S230819av - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"time_created": "2023-08-19T14:59:48Z",
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"external_coinc": null
},
"message_text": "",
"published": "2023-08-19T14:59:48.961525Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-19T14:59:48.961545Z",
"modified": "2023-08-19T14:59:48.965071Z",
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{
"id": 2234,
"topic": "gcn.circular",
"uuid": "b2e345d7-4894-4c55-bdfc-2f488477812d",
"title": "GRB 230818A: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/08/19 15:19:55 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34489",
"subject": "GRB 230818A: Swift-XRT refined Analysis"
},
"message_text": "S. Dichiara (PSU), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), A.P.\nBeardmore (U. Leicester), J.P. Osborne (U. Leicester), E. Ambrosi\n(INAF-IASFPA) , M. Capalbi (INAF-IASFPA), M. Perri (SSDC & INAF-OAR)\nand P.A. Evans report on behalf of the Swift-XRT team:\n\nWe have analysed 6.4 ks of XRT data for GRB 230818A, from 125 s to 40.1\nks after the BAT trigger. The data comprise 41 s in Windowed Timing\n(WT) mode (the first 9 s were taken while Swift was slewing) with the\nremainder in Photon Counting (PC) mode.\n\nThe light curve can be modelled with an initial power-law decay with an\nindex of alpha=2.2 (+0.5, -0.4), followed by a break at T+385 s to an\nalpha of 0.76 (+/-0.06).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 1.96 (+0.21, -0.20). The\nbest-fitting absorption column is 1.8 (+/-0.7) x 10^21 cm^-2, in\nexcess of the Galactic value of 1.1 x 10^21 cm^-2 (Willingale et al.\n2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion\nfactor deduced from this spectrum is 3.6 x 10^-11 (4.7 x 10^-11) erg\ncm^-2 count^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 1.8 (+/-0.7) x 10^21 cm^-2\nGalactic foreground: 1.1 x 10^21 cm^-2\nExcess significance: 1.8 sigma\nPhoton index:\t 1.96 (+0.21, -0.20)\n\nIf the light curve continues to decay with a power-law decay index of\n0.76, the count rate at T+24 hours will be 0.012 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 4.3 x\n10^-13 (5.7 x 10^-13) erg cm^-2 s^-1.\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/01186032.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDU4NDAxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.ulfWoC3L_jTSaUYUQRcU64zOBPE2YTuFKQ2M3mkbOfw\n\n",
"published": "2023-08-19T15:20:09.700819Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-19T15:20:09.700838Z",
"modified": "2023-08-19T15:20:09.707496Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2235,
"topic": "gcn.circular",
"uuid": "25986cff-6afd-49d0-854a-d429042a6567",
"title": "GRB 230818A: Leavitt Observatory upper limit",
"submitter": "Hop gcn.circular",
"authors": "leavittob@gmail.com",
"data": {
"date": "23/08/19 15:48:22 GMT",
"from": "leavittob@gmail.com",
"title": "GCN CIRCULAR",
"number": "34490",
"subject": "GRB 230818A: Leavitt Observatory upper limit"
},
"message_text": "E. Pavoni and L. Moretti (Leavitt Observatory), in 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 observed the field of GRB 230818A (Fermi: GBM team, GCN 34478; Swift: Tohuvavohu et al., GCN 34479; Gompertz et al., GCN 34480; Moskvitin et al., GCN 34483; Malesani et al., GCN 34485; Siegel et al., GCN 34486; Pankov et al., GCN 34487; Quadri et al., GCN 34488) with the telescope of Leavitt Observatory, Italy. Member of:\n\nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili, GRB section.\nATA - Associazione Tuscolana di Astronomia.\n\nThe observations began at 00:57 UT on 2023/08/18, 90 min after the GRB trigger, with our RC telescope D%0 mm F/D=8.\n\nWeather conditions were good.\n\nWe took 32 images of 120 sec each. All images are V filtered, calibrated with master dark and master flat, stacked with ASTAP software.\n\nWe have not detected any clearly visible sources, up to 19.60 magnitude with clear sky at\nRA (J2000): 19h 03m 33.08s\nDec (J2000): +40d 53' 48.0\"\n\non a field of view 31.1 x 26.8 arcmin.\n\nStart\t\tEnd\t\tVlim\n90 min\t\t154 min\t19.60\n\nThe magnitude limit was estimated with nearby stars from the Gaia EDR3 Catalog and is not corrected for galactic dust extinction.\n\nThe message may be cited.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDYwMTA3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.KWH1Bvx63j7Zp_kFIxeTtOnN2JugWKGhbdEZDwqfLRg\n\n",
"published": "2023-08-19T15:48:32.554992Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-19T15:48:32.555009Z",
"modified": "2023-08-19T15:48:32.562220Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2236,
"topic": "gcn.circular",
"uuid": "03ce4766-2a66-430e-a8f2-da31f62815ec",
"title": "GRB 230818A: Tautenburg observations",
"submitter": "Hop gcn.circular",
"authors": "Sylvio Klose at TLS Tautenburg <klose@tls-tautenburg.de>",
"data": {
"date": "23/08/19 16:59:54 GMT",
"from": "Sylvio Klose at TLS Tautenburg <klose@tls-tautenburg.de>",
"title": "GCN CIRCULAR",
"number": "34491",
"subject": "GRB 230818A: Tautenburg observations"
},
"message_text": "S. Klose, S. Melnikov, B. Stecklum, A. Nicuesa Guelbenzu, F. Ludwig (all TLS Tautenburg) report:\n\nWe observed the field of GRB 230818A (Fermi GBM team, GCN 34478; Tohuvavohu et al., GCN 34479) with the Tautenburg 1.34m Schmidt telescope equipped with the TAUKAM 6kx6k CCD camera and using the Sloan filter set.\n\nFor the optical transient discovered by Lipunov et al. (GCN 34476) we measure the following magnitudes:\n\ng = 19.98 +/- 0.02 (midtime: August 19, 2023, 00:03:14 UT),\nr = 19.76 +/- 0.02 (midtime: August 19, 2023, 00:14:43 UT),\ni = 19.79 +/- 0.03 (midtime: August 19, 2023, 00:26:00 UT),\n\nand\n\ng = 21.35 +/- 0.12 (midtime: August 19, 2023, 01:57:48 UT),\nr = 20.97 +/- 0.10 (midtime: August 19, 2023, 02:08:35 UT),\ni = 20.86 +/- 0.10 (midtime: August 19, 2023, 02:19:32 UT),\n\ncalibrated against the Pan-STARRS catalog.\n\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDY0Mzk5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.GIF1uMLuj0KbfzmKoRhP0K-29Weyc8uKCRXa74V9CyU\n\n",
"published": "2023-08-19T17:00:07.327198Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-19T17:00:07.327217Z",
"modified": "2023-08-19T17:00:07.332913Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2237,
"topic": "gcn.circular",
"uuid": "3cc0cbd4-12a6-4987-862f-c722970a0396",
"title": "GRB 230818A: AstroSat CZTI detection",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "23/08/19 17:14:33 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"title": "GCN CIRCULAR",
"number": "34492",
"subject": "GRB 230818A: AstroSat CZTI detection"
},
"message_text": "B. Pari (IITB), 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 GRB 230818A which was also detected by Fermi-GBM (Fermi GBM Team, GCN Circ. 34478) and Swift-BAT (Tohuvavohu et al., GCN Circ. 34479).\n\nThe source was detected in the 20-200 keV energy range in two quadrants. The light curve peaks at 2023-08-18 23:27:37.5 UTC. The measured peak count rate associated with the burst is 96.6 (+28.4, -24.9) counts/s above the background in the combined data of two quadrants, with a total of 372 (+89, -104) counts. The local mean background count rate was 198.2 (+2.1, -3.3) counts/s. Using cumulative rates, we measure a T90 of 6.3 (+2.1, -1.9) 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 2023-08-18 23:27:37.3 UTC. The measured peak count rate associated with the burst is 356.8 (+79.6, -44.8) counts/s above the background in the combined data of all quadrants, with a total of 2027 (+489, -526) counts. The local mean background count rate was 1569.3 (+11.3, -12.1) counts/s. We measure a T90 of 10.0 (+3.6, -4.3) 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\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDY1Mjc4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.ljLUBsct7QIIUJMw5KBzEGzAnMY97cvKSfDWe6tkhuE\n\n",
"published": "2023-08-19T17:14:45.423394Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-19T17:14:45.423411Z",
"modified": "2023-08-19T17:14:45.428052Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2238,
"topic": "igwn.gwalert",
"uuid": "b62061a7-f222-4781-9283-0fbf972ffe92",
"title": "S230819ax - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230819ax/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230819ax/view/"
},
"event": {
"far": 4.305113294199856e-08,
"time": "2023-08-19T17:19:10.454Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1035.2687113679744,
"area_90": 4207.3790434435805,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "d94414779ffab6052ffb27517f9705c8",
"classification": {
"BBH": 0.9700601445496829,
"BNS": 5.333784507578205e-21,
"NSBH": 4.52710463469685e-19,
"Terrestrial": 0.029939855450317077
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-19T17:19:36Z",
"superevent_id": "S230819ax",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-19T17:19:38.114300Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-19T17:19:38.114319Z",
"modified": "2023-08-19T17:19:38.117931Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2239,
"topic": "igwn.gwalert",
"uuid": "7c2056f2-42cb-455f-89dc-93a532f7483d",
"title": "S230819ax - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230819ax/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230819ax/view/"
},
"event": {
"far": 8.842249687858943e-09,
"time": "2023-08-19T17:19:10.455Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1004.8443167290696,
"area_90": 4125.967559858097,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "eb0369eb3a59df9fe72537888c9b6a86",
"classification": {
"BBH": 0.9927880126144608,
"BNS": 4.811589372686276e-21,
"NSBH": 4.084920565817196e-19,
"Terrestrial": 0.007211987385539187
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-19T17:24:13Z",
"superevent_id": "S230819ax",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-19T17:24:14.830817Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-19T17:24:14.830840Z",
"modified": "2023-08-19T17:24:14.834720Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2240,
"topic": "igwn.gwalert",
"uuid": "2ee3739d-df5b-4bf1-986b-fcc1ba6ac166",
"title": "S230819ax - INITIAL",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230819ax/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230819ax/view/"
},
"event": {
"far": 8.842249687858943e-09,
"time": "2023-08-19T17:19:10.455Z",
"group": "CBC",
"search": "AllSky",
"area_50": 1004.8443167290696,
"area_90": 4125.967559858097,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "eb0369eb3a59df9fe72537888c9b6a86",
"classification": {
"BBH": 0.9927880126144608,
"BNS": 4.811589372686276e-21,
"NSBH": 4.084920565817196e-19,
"Terrestrial": 0.007211987385539187
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "INITIAL",
"sequence_num": 3,
"time_created": "2023-08-19T17:37:59Z",
"superevent_id": "S230819ax",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-19T17:38:00.617169Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-19T17:38:00.617188Z",
"modified": "2023-08-19T17:38:00.620728Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2241,
"topic": "gcn.circular",
"uuid": "30dd559a-c210-43d3-887e-d1bdc44c9606",
"title": "GRB 230818A: AKO Upper Limit",
"submitter": "Hop gcn.circular",
"authors": "Mohammad Odeh at Al Khatim Observatory M44 <mshodeh@gmail.com>",
"data": {
"date": "23/08/19 17:53:39 GMT",
"from": "Mohammad Odeh at Al Khatim Observatory M44 <mshodeh@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34493",
"subject": "GRB 230818A: AKO Upper Limit"
},
"message_text": "Mohammad Odeh, Osama Ghannam, Anas Mohammad, and Khalfan Al-Noaimy, report\non behalf of Al-Khatim Observatory (AKO) operated by the International\nAstronomical Center in Abu Dhabi, UAE:\n\nWe observed the field of GRB 230818A (Lipunov et al., GCN 34476; Fermi: GBM\nteam, GCN 34478; Swift: Tohuvavohu et al., GCN 34479; Gompertz et al., GCN\n 34480; Moskvitin et al., GCN 34483; Malesani et al., GCN 34485; Siegel et\nal., GCN 34486; Pankov et al., GCN 34487; Quadri et al., GCN 34488; Pavoni\net al., GCN 34490; Klose et al., GCN 34491) with our 0.36m f/7.7 robotic\ntelescope.\n\nWe obtained 13 x 180 sec. images in the clear filter on 19 August, from\n16:05 to 17:23 UT, (t_mid - t0 = 17.3 hours) with an upper limit of\nmagnitude = 22.0 for the stacked frames.\n\nWe also obtained 15 x 180 sec. images in the Ic filter from 16:02 to 17:32\nUT, (t_mid - t0 = 17.35 hours) with an upper limit of magnitude = 20.2 for\nthe stacked frames.\n\nNo reliable optical afterglow object was detected.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDY3NjI0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.a0jDO1Zz3aOobIpqSMM7OymoMVeL0YqQYwKN0nS3Qs4\n\n",
"published": "2023-08-19T17:53:49.864244Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-19T17:53:49.864261Z",
"modified": "2023-08-19T17:53:49.867925Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2242,
"topic": "gcn.circular",
"uuid": "a1ac3379-f1fb-473f-847e-bdaa03c46f04",
"title": "LIGO/Virgo/KAGRA S230819ax: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "sushant.sharma-chaudhary@ligo.org",
"data": {
"date": "23/08/19 17:55:28 GMT",
"from": "sushant.sharma-chaudhary@ligo.org",
"title": "GCN CIRCULAR",
"number": "34494",
"subject": "LIGO/Virgo/KAGRA S230819ax: 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 S230819ax during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-08-19 17:19:10.455 UTC (GPS\ntime: 1376500768.455). The candidate was found by the CWB [1], GstLAL\n[2], MBTA [3], oLIB [4], and SPIIR [5] analysis pipelines.\n\nS230819ax is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 8.8e-09 Hz, or about one in 3\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230819ax\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS\n(<1%).\n\nThere were noise transients at the LIGO Hanford and evidence for\nnonstationary noise at both LIGO detectors which may affect the\nparameters or the significance of the candidate.\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is <1%. [6] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [6] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat either of the binary components lies between 3 and 5 solar masses\n(HasMassgap) is <1%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 25 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,2, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 5 minutes after the\ncandidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,2. For\nthe bayestar.multiorder.fits,2 sky map, the 90% credible region is\n4126 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 4872 +/- 1527 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] Lynch et al. PRD 95, 104046 (2017)\n [5] Chu et al. PRD 105, 024023 (2022)\n [6] Chatterjee et al. ApJ 896, 54 (2020)\n [7] Singer & Price PRD 93, 024013 (2016)\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDY3NzMxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.iPTcT1lICisXnVz-sx8N8amZnP6XhVXWomvOYP4CBGM\n\n",
"published": "2023-08-19T17:55:36.055289Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-19T17:55:36.055305Z",
"modified": "2023-08-19T17:55:36.058758Z",
"nonlocalizedevents": [
{
"event_id": "S230819a"
}
],
"targets": []
},
{
"id": 2243,
"topic": "gcn.circular",
"uuid": "ee09b33a-dc15-4aa6-9845-026984940fe3",
"title": "GRB 230818A: further SAO RAS Zeiss-1000 observations",
"submitter": "Hop gcn.circular",
"authors": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"data": {
"date": "23/08/19 19:35:54 GMT",
"from": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"title": "GCN CIRCULAR",
"number": "34495",
"subject": "GRB 230818A: further SAO RAS Zeiss-1000 observations"
},
"message_text": "A. S. Moskvitin (SAO RAS), V. P. Goranskij (SAI MSU),\nreport on behalf of the GRB follow-up team.\n\nWe observed the field of GRB 230818A (Fermi GBM team, GCN 34478;\nTohuvavohu et al., GCN 34479) with the 1-m telescope of SAO RAS\nZeiss-1000 equipped with the CCD photometer. We obtained\n4 x 300 sec. images in Rc band on August 19, 17:42:30--18:07:26 UT.\n\nThe OT (Lipunov et al., GCNs 34476, 34477, 34481, 34482;\nGompertz et al., GCN 34480; Moskvitin et al., GCN 34483;\nMalesani et al., GCN 34485; Siegel and Tohuvavohu, GCN 34486;\nPankov et al., GCN 34487; Quadri and Strabla, GCN 34488;\nKlose et al., GCN 34491) is marginally detected with\nthe brightness of R = 23.0 +/- 0.3 (t_mid - t0 = 0.76903 days).\n\nThis preliminary photometry is based on nearby USNO-B1 stars (R2 mag).\nThe magnitude of the OT is not corrected for MW extinction.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDczNzU5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.koIM5dXZ-hrXyVo3lrAtUwTD9Vt14vvRU1Yj8eAo5fI\n\n",
"published": "2023-08-19T19:36:05.626619Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-19T19:36:05.626640Z",
"modified": "2023-08-19T19:36:05.632552Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2244,
"topic": "gcn.circular",
"uuid": "86b70a92-7140-424f-bb62-44cfe42835f1",
"title": "GRB 230812B: SAO RAS Zeiss-1000 observations",
"submitter": "Hop gcn.circular",
"authors": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"data": {
"date": "23/08/19 20:09:24 GMT",
"from": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"title": "GCN CIRCULAR",
"number": "34496",
"subject": "GRB 230812B: SAO RAS Zeiss-1000 observations"
},
"message_text": "A. S. Moskvitin (SAO RAS), V. P. Goranskij (SAI MSU),\nreport on behalf of the GRB follow-up team.\n\nWe observed the field of GRB 230812B (Fermi GBM Team, GCN 34386;\nScotton et al., GCN 34392; Page et al. GCN 34394; Kuin et al.,\nGCN 34399; Casentini et al., GCN 34402) with the 1-m telescope\nof SAO RAS Zeiss-1000 equipped with the CCD photometer. We obtained\n6 x 300 sec. images in Rc band on August 19, 18:11:41--18:45:30 UT.\n\nThe OT (Lesage et al., GCN 34387; Scotton et al., GCN 34392; Page,\nGCN 34394; Zheng & Filippenko, GCN 34395; Lipunov et al., GCN 34396;\nSalgundi et al., GCN 34397; Ackley et al., GCN 34398; Xiong et al.,\nGCN 34401; Casentini et al., GCN 34402; Frederiks et al., GCN 34403;\nMao et al., GCN 34404; Odeh et al., GCN 34405; Moskvitin & Spiridonova,\nGCN 34406; Leonini et al., GCN 34408; de Ugarte Postigo et al.,\nGCNs 24409, 34410; Belkin et al. GCN 34412; Ruocco et al. GCN 34413;\nFrederiks et al. GCN 34414; Ruocco et al. GCN 34415; Shrestha et al.\nGCN 34416; Quadri et al. GCN 34417; Adami et al. GCN 34418;\nMoretti et al. GCN 34419; Kumar et al. GCN 34420; Belkin et al. GCNs\n34421, GCN 34423; Pyshna et al., GCN 34425; Moskvitin & Spiridonova,\nGCN 34428; Quadri & Strabla, GCN 34430; Mihov et al., GCN 34431;\nBelkin et al. GCN 34432; Klose et al., GCN 34435; Scarfi, GCN 34436;\nMoskvitin & Spiridonova, GCNs 34442, 34461, 34471, 34475;\nVinko et al., GCN 34463) is clearly detected in our stacked frame\nwith the brightness of R = 21.8 +/- 0.1 (t_mid - t0 = 6.9794 days).\n\nThis preliminary photometry is based on the nearby SDSS stars;\nmagnitudes are converted using Lupton (2005) equations.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDc1NzY5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.x5QV4ZKVznOra-mE7IQJls336fJiB0VUTQWj5h2KveQ\n\n",
"published": "2023-08-19T20:09:35.174578Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-19T20:09:35.174596Z",
"modified": "2023-08-19T20:09:35.178574Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2245,
"topic": "gcn.circular",
"uuid": "af466ef3-4048-4c3a-b80a-76721bf3044d",
"title": "GRB 230818A: SAO RAS 6-m telescope spectroscopy",
"submitter": "Hop gcn.circular",
"authors": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"data": {
"date": "23/08/19 20:52:59 GMT",
"from": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"title": "GCN CIRCULAR",
"number": "34497",
"subject": "GRB 230818A: SAO RAS 6-m telescope spectroscopy"
},
"message_text": "A. S. Moskvitin, D. V. Oparin (SAO RAS), A. S. Pozanenko (IKI),\nreport on behalf of the larger GRB follow-up collaboration.\n\nWe observed the GRB 230818A OT (Lipunov et al., GCNs 34476, 34477,\n34481, 34482; Gompertz et al., GCN 34480; Moskvitin et al., GCN 34483,\n34495; Malesani et al., GCN 34485; Siegel and Tohuvavohu, GCN 34486;\nPankov et al., GCN 34487; Quadri and Strabla, GCN 34488;\nKlose et al., GCN 34491) with the BTA 6-meter telescope of SAO RAS\nequipped with Scorpio-II. The observations were started since ~ 0.5 h\nafter the burst (Fermi: GBM team, GCN 34478; Swift: Tohuvavohu et al.,\nGCN 34479; AstroSat: Pari et al., GCN 34492).\n\nIn the 4 x 600 sec spectrum of (4200--8530 AA, FWHM resolution ~ 7A)\nwe identified the absorption lines (C IV, Si II) at a common redshift\nof z = 2.42. We also identified Si IV and Al II lines at a common\nredshift of 2.38 which might be an intervening system. Thus we confirm\nthe redshift measurement obtained by Malezani et al. (GCN 34485).\n\nUsing acquisition observation we obtained preliminary photometry\nof the afterglow as following (calibrated against Pan-STARRS nearby\nstars)\n\nDate UT-start Exptime Filter t-T0 OT Err\n sec days\n2023-08-19 00:00:28 2 x 20 r' 0.02339 19.50 +/- 0.02\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDc4Mzg0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.UYgGA2BhF_VqXBY1Y9S3x2DPrgqvjjv8v9Wrp_59OJ0\n\n",
"published": "2023-08-19T20:53:09.771372Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-19T20:53:09.771389Z",
"modified": "2023-08-19T20:53:09.778569Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2246,
"topic": "gcn.circular",
"uuid": "aba79ae2-05ea-4fad-93b9-dc2eed510d0a",
"title": "GRB 230818A: Nickel and KAIT telescope optical observations",
"submitter": "Hop gcn.circular",
"authors": "Weikang Zheng at UC Berkeley <weikang@berkeley.edu>",
"data": {
"date": "23/08/19 22:13:43 GMT",
"from": "Weikang Zheng at UC Berkeley <weikang@berkeley.edu>",
"title": "GCN CIRCULAR",
"number": "34498",
"subject": "GRB 230818A: Nickel and KAIT telescope optical observations"
},
"message_text": "Neil Pichay, Elma Chuang, WeiKang Zheng and Alex Filippenko (UC Berkeley)\n\nreport on behalf of the KAIT GRB team:\n\n\nWe observed the field of GRB 230818A (Fermi GBM team, GCN 34478;\n\nTohuvavohu et al., GCN 34479) with the 1-m Nickel and 0.76-m KAIT\n\ntelescopes located at Lick observatory, California. Observations\n\nstarted about 0.21 days after the burst. A total of 6 images (600s\n\nexposure each) in R band were taken with Nickel telescopes, while\n\nKAIT images were taken in clear band, with 60s exposure and coadded.\n\nWe detected the optical afterglow (Lipunov et al., GCNs 34476, 34477,\n\n34481, 34482; Gompertz et al., GCN 34480; Moskvitin et al., GCN 34483;\n\nMalesani et al., GCN 34485; Siegel and Tohuvavohu, GCN 34486; Pankov\n\net al., GCN 34487; Quadri and Strabla, GCN 34488; Klose et al., GCN\n\n34491; Moskvitin et al., GCN 34495; 34497) and measure the following\n\nmagnitude calibrated to the Pan-STARRS1 catalog:\n\n\n\nt-t0(days) filter mag err\n\n0.218 clear 21.8 0.3\n\n0.226 R 21.6 0.2\n\n0.324 clear 21.3 0.3\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDgzMjI4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.urvaob3G37iDg9ZiK9TC4WiAeltTEwAQtFQFJQVs2oM\n\n",
"published": "2023-08-19T22:13:53.463937Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-19T22:13:53.463953Z",
"modified": "2023-08-19T22:13:53.470963Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2247,
"topic": "igwn.gwalert",
"uuid": "048c6b4c-0779-4b48-9340-ee8154b82d21",
"title": "S230819ax - UPDATE",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230819ax/files/bayestar.multiorder.fits,2",
"gracedb": "https://gracedb.ligo.org/superevents/S230819ax/view/"
},
"event": {
"far": 8.842249687858943e-09,
"time": "2023-08-19T17:19:10.455Z",
"group": "CBC",
"search": "AllSky",
"area_50": 848.7356987197926,
"area_90": 4042.877488982191,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "8cf9301d9da39c3f13367ea7768b9b17",
"classification": {
"BBH": 0.22510253270292888,
"BNS": 3.1665889186664814e-21,
"NSBH": 2.1734480489520617e-19,
"Terrestrial": 0.7748974672970711
},
"skymap_version": 2,
"central_frequency": null
},
"alert_type": "UPDATE",
"sequence_num": 4,
"time_created": "2023-08-19T23:29:50Z",
"superevent_id": "S230819ax",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-19T23:29:51.433831Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-19T23:29:51.433853Z",
"modified": "2023-08-19T23:29:51.439185Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2248,
"topic": "gcn.circular",
"uuid": "6d673fe0-cc2f-4996-be7e-59e901e362ce",
"title": "LIGO/Virgo/KAGRA S230819ax: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "Anjali Yelikar at Rochester Institute of Technology <ay2016@g.rit.edu>",
"data": {
"date": "23/08/19 23:49:10 GMT",
"from": "Anjali Yelikar at Rochester Institute of Technology <ay2016@g.rit.edu>",
"title": "GCN CIRCULAR",
"number": "34499",
"subject": "LIGO/Virgo/KAGRA S230819ax: 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 S230819ax (GCN Circular 34494). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits, distributed via GCN Notice, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S230819ax\n\nFor the Bilby.multiorder.fits sky map, the 90% credible region is 4044 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4216 +/- 1645 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNDg4OTU2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.3Ni_YXT-GUlZYW-SpQYtfYDv13EXV4xWlBwOKZoCnA8\n\n",
"published": "2023-08-19T23:49:23.123958Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-19T23:49:23.123975Z",
"modified": "2023-08-19T23:49:23.129571Z",
"nonlocalizedevents": [
{
"event_id": "S230819a"
}
],
"targets": []
},
{
"id": 2249,
"topic": "igwn.gwalert",
"uuid": "5c99a6f0-4281-48dc-9ae0-3a980a3f3625",
"title": "S230820g - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230820g/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230820g/view/"
},
"event": {
"far": 1.051294289523686e-05,
"time": "2023-08-20T05:21:16.067Z",
"group": "CBC",
"search": "AllSky",
"area_50": 314.9449403654904,
"area_90": 1680.265877712756,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.004507266841791322,
"HasMassGap": 0.1297688043391692,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "633f17bfa2c7cd7d7c53acc23b637a12",
"classification": {
"BBH": 0.13840902939480917,
"BNS": 7.035987468235321e-17,
"NSBH": 0.00027561655812840386,
"Terrestrial": 0.8613153540470624
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-20T05:21:40Z",
"superevent_id": "S230820g",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-20T05:21:41.872863Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-20T05:21:41.872885Z",
"modified": "2023-08-20T05:21:41.879289Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2250,
"topic": "igwn.gwalert",
"uuid": "70405e76-c0ea-41c5-a6ca-39f3e0f8c5e3",
"title": "S230820g - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230820g/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230820g/view/"
},
"event": {
"far": 1.051294289523686e-05,
"time": "2023-08-20T05:21:16.067Z",
"group": "CBC",
"search": "AllSky",
"area_50": 314.9449403654904,
"area_90": 1680.265877712756,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.004507266841791322,
"HasMassGap": 0.1297688043391692,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "633f17bfa2c7cd7d7c53acc23b637a12",
"classification": {
"BBH": 0.13840902939480917,
"BNS": 7.035987468235321e-17,
"NSBH": 0.00027561655812840386,
"Terrestrial": 0.8613153540470624
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-20T05:26:15Z",
"superevent_id": "S230820g",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-20T05:26:16.533275Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-20T05:26:16.533307Z",
"modified": "2023-08-20T05:26:16.537421Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2251,
"topic": "gcn.circular",
"uuid": "8f7e081a-2918-49c8-a6ef-2ba658d44992",
"title": "GRB 230812B: GIT Confirmation of SN rise",
"submitter": "Hop gcn.circular",
"authors": "Vishwajeet Swain at IIT Bombay <vishwajeet.s@iitb.ac.in>",
"data": {
"date": "23/08/20 09:45:51 GMT",
"from": "Vishwajeet Swain at IIT Bombay <vishwajeet.s@iitb.ac.in>",
"title": "GCN CIRCULAR",
"number": "34500",
"subject": "GRB 230812B: GIT Confirmation of SN rise"
},
"message_text": "H. Kumar (IITB), V. Swain (IITB), R. Teja (IIA), R. Kumar (IITB), A. Salgundi (IITB), V. Bhalerao (IITB), G.C. Anupama (IIA), D.K. Sahu (IIA), S. Barway (IIA) and K. Angail (IAO) report on behalf of the GIT team:\n\nWe continued observation of the field of the GRB230812B (Fermi GBM Team, GCN 34386) with 0.7m GROWTH-India Telescope (GIT). Starting at 15:26:30 UT on 2023-08-19, we took 18 exposures of 300 sec each in r' band and detected the optical source in our stacked images. We also observed the target with HCT (2x 25 min, PI: R Teja), and detect the source as well. The details of the photometry are given in the below table:\n\n\n-------------------------------------------------------\nJD (mid) | T-T0 (days)| Filter | Exposure (s) | Magnitude (AB) | Telescope\n\n-------------------------------------------------------\n\n2460176.199743 | 6.90 | r' | 18 x 300 | 22.06 +/- 0.10 | GIT\n\n2460176.196935 | 6.91 | r' | 2 x 1500 | 22.04 +/- 0.18 | HCT\n\n-------------------------------------------------------\n\nOur photometry shows a significant deviation from the earlier estimated power-law decay (alpha = 1.23 +/- 0.04) and shows a rise by ~0.9 mag as compared to afterglow-only emission, suggesting the presence of a supernova component. Our results are consistent with A. S. Moskvitin et al., GCN 33475. Based on our SN + PL fits predict that the emission should rise slightly over next 15 days and will start decaying again once the SN peaks around T-T0 ~ 22 days.\n\nWe encourage the spectroscopic observation to confirm the presence of SN fully.\n\nAlso see: Zheng & Filippenko, GCN 34395, Lipunov et al., GCN 34396, Salgundi et al., GCN 34397, Ackley et al., GCN 34398, Kuin et al. GCN 34399, Mao et al., GCN 34404, Odeh et al., GCN 34405, Moskvitin et al., GCN 34406, Leonini et al., GCN 34408, de Ugarte Postigo et al. GCN 34409, 34410 & 34468, Belkin et al., GCN 34412, and N. Ruocco et al., GCN 34413, N. Ruocco et al., GCN 34413, M. Shrestha et al., GCN 34416, C. Adami et al., GCN 34418, L. Moretti et al., GCN 34419, R. Kumar et al., GCN 33420, S. Belkin et al., GCN 33421, 33423, 33432, O. Pyshna et al., GCN 34425, A. S. Moskvitin et al., GCN 33428, 33442, 33461 33471, 33475 & 33496, U.Quadri and L.Strabla GCN 33430, B. Mihov et al., GCN 33431, Lauren Rhodes et al., GCN 33433, S. Klose et al., GCN 33435, Giulio Scarfì et al., GCN 33436, F.D. Romanov GCN 33443, Lopresti et al., GCN 33445, J. Vinko et al., GCN 33463.\n\nThe GROWTH India Telescope (GIT; Kumar et al. 2022) is a 70-cm telescope with a 0.7-degree field of view, set up by the Indian Institute of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB) with funding from DST-SERB and IUSSTF. It is located at the Indian Astronomical Observatory (Hanle), operated by IIA. We acknowledge funding by the IITB alumni batch of 1994, which partially supports the operations of the telescope. Telescope technical details are available at https://sites.google.com/view/growthindia/.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNTI0NzU2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.dNb67UCb3nEKP7J-PKgrLpvhe8P_5Exn9YxaGTF_OTA\n\n",
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"area_90": 4050.4311317890924,
"duration": null,
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"time_created": "2023-08-20T16:23:17Z",
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"retracted": false,
"created": "2023-08-20T16:23:18.596641Z",
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{
"id": 2263,
"topic": "igwn.gwalert",
"uuid": "8bdbfcc4-8e44-4096-8613-b37454221424",
"title": "S230820am - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"duration": null,
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"time_created": "2023-08-20T16:27:51Z",
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"message_text": "",
"published": "2023-08-20T16:27:53.299876Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-20T16:27:53.299907Z",
"modified": "2023-08-20T16:27:53.305258Z",
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{
"id": 2264,
"topic": "igwn.gwalert",
"uuid": "c7034329-ef23-46e8-81bc-9afe9c9aec12",
"title": "S230820at - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"sequence_num": 1,
"time_created": "2023-08-20T17:03:20Z",
"superevent_id": "S230820at",
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"message_text": "",
"published": "2023-08-20T17:03:21.928438Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-20T17:03:21.928468Z",
"modified": "2023-08-20T17:03:21.932702Z",
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{
"id": 2265,
"topic": "igwn.gwalert",
"uuid": "bdfe47b8-75de-497d-9461-d1bd7e8af86a",
"title": "S230820at - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"event": {
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"sequence_num": 2,
"time_created": "2023-08-20T17:07:56Z",
"superevent_id": "S230820at",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-20T17:07:57.631640Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-20T17:07:57.631660Z",
"modified": "2023-08-20T17:07:57.635268Z",
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},
{
"id": 2266,
"topic": "gcn.circular",
"uuid": "58db3da3-4dc5-41dc-b2b4-3dc9fdfb230f",
"title": "GRB 230818A: Fermi GBM Observation",
"submitter": "Hop gcn.circular",
"authors": "Cori Fletcher at USRA <cfletcher@usra.edu>",
"data": {
"date": "23/08/20 18:27:14 GMT",
"from": "Cori Fletcher at USRA <cfletcher@usra.edu>",
"title": "GCN CIRCULAR",
"number": "34501",
"subject": "GRB 230818A: Fermi GBM Observation"
},
"message_text": "P. Veres (UAH), C. Fletcher (USRA) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 23:27:35.37 UT on 18 August 2023, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 230818A (trigger 714094060/230818977).\nwhich was also detected by Swift-BAT (A. Tohuvavohu et al. 2023, GCN 34479) and AstroSat (B. Pari et al. 2023, GCN 34492).\nThe Fermi GBM Final Real-time Localization (GCN 34478) is consistent with the Swift-BAT position.\n\nThe angle from the Fermi LAT boresight is 79 degrees.\n\nThe GBM light curve consists of a couple peaks with a duration (T90)\nof about 10 s (50-300 keV). The time-averaged spectrum\nfrom T0-1.5 to T0+13.8 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -1.02 +/- 0.06 and the cutoff energy,\nparameterized as Epeak, is 260 +/- 30 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(5.6 +/- 0.3)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+0.58 s in the 10-1000 keV band is 10.2 +/- 0.3 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog:\nhttps://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html\n\nFor Fermi GBM data and info, please visit the official Fermi GBM Support Page:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNTU2MDM5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.f8BEWgFAF79ffDBnU22HD8brahcgtUf8zGfyU5zd1po\n\n",
"published": "2023-08-20T18:27:28.680066Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-20T18:27:28.680092Z",
"modified": "2023-08-20T18:27:28.684084Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2267,
"topic": "gcn.circular",
"uuid": "5399315d-a5a0-4c80-8e54-97a3eb1b1a02",
"title": "Swift Triggers 1186280 and 1186291 are not GRBs",
"submitter": "Hop gcn.circular",
"authors": "David Palmer at LANL <palmer@lanl.gov>",
"data": {
"date": "23/08/20 19:24:01 GMT",
"from": "David Palmer at LANL <palmer@lanl.gov>",
"title": "GCN CIRCULAR",
"number": "34502",
"subject": "Swift Triggers 1186280 and 1186291 are not GRBs"
},
"message_text": "\nS. Dichiara (PSU), J.D. Gropp (PSU), N. P. M. Kuin (UCL-MSSL),\nF. E. Marshall (NASA/GSFC), B. Sbarufatti (INAF-OAB) and\nM. A. Williams (PSU) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nSwift BAT triggers 1186280 and 1186291, at 18:28:34 and 19:09:36\nrespectively on 2023-08-20 UT, were due to misidentification\nof known sources (Sco X-1 and the Crab) during a star tracker\nloss-of-lock event. They are not astrophysical events.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNTU5NDQ2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.F3caBN9jAYPY9NypshJmJ62UOrH5ppKv9dBwVM7tLqQ\n\n",
"published": "2023-08-20T19:24:14.400754Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-20T19:24:14.400772Z",
"modified": "2023-08-20T19:24:14.404612Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2268,
"topic": "igwn.gwalert",
"uuid": "992507ac-14bb-4634-a6c1-5f687e2df08c",
"title": "S230820bi - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"published": "2023-08-20T19:41:49.065867Z",
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{
"id": 2269,
"topic": "igwn.gwalert",
"uuid": "deb43d89-a6ab-4734-933f-8a215867e64b",
"title": "S230820bi - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"time": "2023-08-20T19:40:47.086Z",
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"time_created": "2023-08-20T19:46:23Z",
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},
"message_text": "",
"published": "2023-08-20T19:46:23.948871Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-20T19:46:23.948891Z",
"modified": "2023-08-20T19:46:23.952562Z",
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},
{
"id": 2270,
"topic": "gcn.circular",
"uuid": "9144c70f-4ba9-4a98-9aed-7cebf06f1a20",
"title": "Swift GRB230820.82: 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": "23/08/20 19:50:53 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34503",
"subject": "Swift GRB230820.82: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB230820.82 (trigger No 1186295,16h 21m 03.14s , -17d 25m 05.2s, R=0.05) errorbox 60 sec after trigger time at 2023-08-20 19:37:48 UT, with upper limit up to 16.2 mag. The observations began at zenith distance = 81 deg. The sun altitude is -30.3 deg.\n\nThe galactic latitude b = 22 deg., longitude l = 358 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"57049\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 151 | MASTER-Kislovodsk | C | 180 | 16.2 |\n 151 | MASTER-Kislovodsk | C | 180 | 16.0 |\n 441 | MASTER-Kislovodsk | P- | 80 | 14.8 |\n 441 | MASTER-Kislovodsk | P| | 80 | 14.6 |\n 539 | MASTER-Kislovodsk | P- | 100 | 15.5 |\n 539 | MASTER-Kislovodsk | P| | 100 | 15.7 |\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNTYxMDU4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.py0YbIrnwEfgaBHSJYHWF3AnfyjClTphJltNB1RriF8\n\n",
"published": "2023-08-20T19:51:03.805747Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-20T19:51:03.805820Z",
"modified": "2023-08-20T19:51:03.811822Z",
"nonlocalizedevents": [],
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},
{
"id": 2271,
"topic": "igwn.gwalert",
"uuid": "f2fc1756-2707-440c-8c0b-aae10b578acb",
"title": "S230820bj - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"far": 2.161423981306143e-05,
"time": "2023-08-20T19:55:45.858Z",
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"area_50": 867.4099823257411,
"area_90": 22838.85867348628,
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"sequence_num": 1,
"time_created": "2023-08-20T19:56:12Z",
"superevent_id": "S230820bj",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-20T19:56:13.631690Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-20T19:56:13.631710Z",
"modified": "2023-08-20T19:56:13.635424Z",
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},
{
"id": 2272,
"topic": "igwn.gwalert",
"uuid": "85a62d3f-be40-4876-bd85-7eda1d500884",
"title": "S230820bj - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"group": "CBC",
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"sequence_num": 2,
"time_created": "2023-08-20T20:00:47Z",
"superevent_id": "S230820bj",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-20T20:00:48.498977Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-20T20:00:48.499006Z",
"modified": "2023-08-20T20:00:48.502701Z",
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{
"id": 2273,
"topic": "igwn.gwalert",
"uuid": "43b61e99-5c2b-4af4-8625-d8fc95f09748",
"title": "S230820bn - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"time": "2023-08-20T20:38:44.457Z",
"group": "CBC",
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"area_50": 4155.342837440488,
"area_90": 12743.83470888636,
"duration": null,
"pipeline": "spiir",
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"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-20T20:39:08Z",
"superevent_id": "S230820bn",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-20T20:39:09.136987Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-20T20:39:09.137030Z",
"modified": "2023-08-20T20:39:09.140742Z",
"nonlocalizedevents": [],
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},
{
"id": 2274,
"topic": "igwn.gwalert",
"uuid": "8c10bbfc-3af8-41f1-b8b1-badec9f90ebd",
"title": "S230820bn - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230820bn/view/"
},
"event": {
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"time": "2023-08-20T20:38:44.457Z",
"group": "CBC",
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"area_90": 12743.83470888636,
"duration": null,
"pipeline": "spiir",
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},
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},
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},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-20T20:43:42Z",
"superevent_id": "S230820bn",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-20T20:43:43.952628Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-20T20:43:43.952667Z",
"modified": "2023-08-20T20:43:43.959091Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2275,
"topic": "igwn.gwalert",
"uuid": "29b2a770-2955-428d-ac49-909314be8738",
"title": "S230820bq - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230820bq/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230820bq/view/"
},
"event": {
"far": 2.68879240689624e-09,
"time": "2023-08-20T21:25:15.973Z",
"group": "CBC",
"search": "AllSky",
"area_50": 596.7377817451397,
"area_90": 2203.9851123245244,
"duration": null,
"pipeline": "gstlal",
"properties": {
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"HasMassGap": 0.006205128205128205,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": true,
"skymap_hash": "7e7ec93d736e341ca9897181f081895b",
"classification": {
"BBH": 0.99746893739457,
"BNS": 3.3110325022052054e-19,
"NSBH": 1.1352715078143542e-09,
"Terrestrial": 0.002531061470158469
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-20T21:25:45Z",
"superevent_id": "S230820bq",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-20T21:25:47.591897Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-20T21:25:47.591917Z",
"modified": "2023-08-20T21:25:47.595627Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2276,
"topic": "igwn.gwalert",
"uuid": "b5aea3ef-20f6-48b6-8923-f2ff54c6bd05",
"title": "S230820bq - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230820bq/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230820bq/view/"
},
"event": {
"far": 4.230770400681649e-08,
"time": "2023-08-20T21:25:15.975Z",
"group": "CBC",
"search": "AllSky",
"area_50": 518.6834727405012,
"area_90": 1974.0186535366647,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
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"L1"
],
"significant": true,
"skymap_hash": "7b9a8d07d092495af31c1bc20c5bd7c9",
"classification": {
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"BNS": 0.0,
"NSBH": 0.0,
"Terrestrial": 0.04233163583986921
},
"skymap_version": 1,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-20T21:30:32Z",
"superevent_id": "S230820bq",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-20T21:30:34.279778Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-20T21:30:34.279801Z",
"modified": "2023-08-20T21:30:34.283393Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2277,
"topic": "igwn.gwalert",
"uuid": "cd3ddbde-d1f2-43ef-bba3-83cbdd74b973",
"title": "S230820bq - INITIAL",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230820bq/files/bayestar.multiorder.fits,1",
"gracedb": "https://gracedb.ligo.org/superevents/S230820bq/view/"
},
"event": {
"far": 4.230770400681649e-08,
"time": "2023-08-20T21:25:15.975Z",
"group": "CBC",
"search": "AllSky",
"area_50": 518.6834727405012,
"area_90": 1974.0186535366647,
"duration": null,
"pipeline": "spiir",
"properties": {
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"HasMassGap": 0.0,
"HasRemnant": 0.0
},
"instruments": [
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"L1"
],
"significant": true,
"skymap_hash": "7b9a8d07d092495af31c1bc20c5bd7c9",
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"BNS": 0.0,
"NSBH": 0.0,
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},
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},
"alert_type": "INITIAL",
"sequence_num": 3,
"time_created": "2023-08-20T21:40:40Z",
"superevent_id": "S230820bq",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-20T21:40:41.693859Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-20T21:40:41.693879Z",
"modified": "2023-08-20T21:40:41.697448Z",
"nonlocalizedevents": [],
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},
{
"id": 2278,
"topic": "gcn.circular",
"uuid": "3613cb4d-bdf6-4db4-9e7f-054eb7c4ac77",
"title": "LIGO/Virgo/KAGRA S230820bq: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "sushant.sharma-chaudhary@ligo.org",
"data": {
"date": "23/08/20 21:49:25 GMT",
"from": "sushant.sharma-chaudhary@ligo.org",
"title": "GCN CIRCULAR",
"number": "34504",
"subject": "LIGO/Virgo/KAGRA S230820bq: 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 S230820bq during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-08-20 21:25:15.975 UTC (GPS\ntime: 1376601933.975). The candidate was found by the CWB [1], GstLAL\n[2], MBTA [3], PyCBC Live [4], and SPIIR [5] analysis pipelines.\n\nS230820bq is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 4.2e-08 Hz, or about one in 8\nmonths. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230820bq\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (96%), Terrestrial (4%), BNS (<1%), or NSBH (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is <1%. [6] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [6] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat either of the binary components lies between 3 and 5 solar masses\n(HasMassGap) is <1%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 29 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [7], distributed via GCN notice about 5 minutes after the\ncandidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,1. For\nthe bayestar.multiorder.fits,1 sky map, the 90% credible region is\n1975 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 4785 +/- 1468 Mpc (a posteriori mean\n+/- standard deviation).\n\nFor further information about analysis methodology and the contents of\nthis alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide\nhttps://emfollow.docs.ligo.org/userguide/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n [2] Tsukada et al. arXiv:2305.06286 (2023) and Ewing et al.\narXiv:2305.05625 (2023)\n [3] Aubin et al. CQG 38, 095004 (2021)\n [4] Dal Canton et al. ApJ 923, 254 (2021)\n [5] Chu et al. PRD 105, 024023 (2022)\n [6] Chatterjee et al. ApJ 896, 54 (2020)\n [7] Singer & Price PRD 93, 024013 (2016)\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNTY4MTcxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.s-MfmJgSzPd61_43M5_H1v72m4myc-Ay9CxM_pD6pIs\n\n",
"published": "2023-08-20T21:49:39.015306Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-20T21:49:39.015324Z",
"modified": "2023-08-20T21:49:39.019065Z",
"nonlocalizedevents": [
{
"event_id": "S230820b"
}
],
"targets": []
},
{
"id": 2279,
"topic": "igwn.gwalert",
"uuid": "c3bad924-bb80-47fe-bcae-0f073e79b2fa",
"title": "S230821d - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230821d/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230821d/view/"
},
"event": {
"far": 2.302231223438866e-05,
"time": "2023-08-21T01:37:52.809Z",
"group": "CBC",
"search": "AllSky",
"area_50": 3338.7101206500215,
"area_90": 11333.821384931598,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 0.11414883276632545,
"HasMassGap": 0.28193905559779564,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "88ceb9ec5c6c3863a46c31e10806b7e1",
"classification": {
"BBH": 0.17837481436952676,
"BNS": 0.0,
"NSBH": 0.0043256040007434585,
"Terrestrial": 0.8172995816297298
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-21T01:38:15Z",
"superevent_id": "S230821d",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-21T01:38:16.677885Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-21T01:38:16.677907Z",
"modified": "2023-08-21T01:38:16.682643Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2280,
"topic": "igwn.gwalert",
"uuid": "659111c5-35e9-4237-9d58-86c3e41dd065",
"title": "S230821d - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230821d/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230821d/view/"
},
"event": {
"far": 2.302231223438866e-05,
"time": "2023-08-21T01:37:52.809Z",
"group": "CBC",
"search": "AllSky",
"area_50": 3338.7101206500215,
"area_90": 11333.821384931598,
"duration": null,
"pipeline": "spiir",
"properties": {
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"HasMassGap": 0.28193905559779564,
"HasRemnant": 0.0
},
"instruments": [
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"L1"
],
"significant": false,
"skymap_hash": "88ceb9ec5c6c3863a46c31e10806b7e1",
"classification": {
"BBH": 0.17837481436952676,
"BNS": 0.0,
"NSBH": 0.0043256040007434585,
"Terrestrial": 0.8172995816297298
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-21T01:42:49Z",
"superevent_id": "S230821d",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-21T01:42:51.152893Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-21T01:42:51.152915Z",
"modified": "2023-08-21T01:42:51.156674Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2281,
"topic": "igwn.gwalert",
"uuid": "984978e3-f40a-4289-8ab9-8406c2d0f271",
"title": "S230821e - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230821e/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230821e/view/"
},
"event": {
"far": 1.312204767600633e-05,
"time": "2023-08-21T01:49:20.149Z",
"group": "CBC",
"search": "AllSky",
"area_50": 5937.163246223796,
"area_90": 19102.32336500616,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.145466491211954,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "dc926be2dbb1f0a87eaceb4421e454bf",
"classification": {
"BBH": 0.0003264478713909838,
"BNS": 0.010861351701762374,
"NSBH": 0.14262558901180455,
"Terrestrial": 0.846186611415042
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-21T01:49:44Z",
"superevent_id": "S230821e",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-21T01:49:46.143521Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-21T01:49:46.143541Z",
"modified": "2023-08-21T01:49:46.148123Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2282,
"topic": "igwn.gwalert",
"uuid": "ece748f3-bfe1-40c1-bb3f-521203685fd4",
"title": "S230821e - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230821e/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230821e/view/"
},
"event": {
"far": 1.312204767600633e-05,
"time": "2023-08-21T01:49:20.149Z",
"group": "CBC",
"search": "AllSky",
"area_50": 5937.163246223796,
"area_90": 19102.32336500616,
"duration": null,
"pipeline": "spiir",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.145466491211954,
"HasRemnant": 0.0
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "dc926be2dbb1f0a87eaceb4421e454bf",
"classification": {
"BBH": 0.0003264478713909838,
"BNS": 0.010861351701762374,
"NSBH": 0.14262558901180455,
"Terrestrial": 0.846186611415042
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-21T01:54:18Z",
"superevent_id": "S230821e",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-21T01:54:19.812280Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-21T01:54:19.812300Z",
"modified": "2023-08-21T01:54:19.815635Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2283,
"topic": "igwn.gwalert",
"uuid": "84e1b812-af9e-4a70-b185-bedbcb1c85ed",
"title": "S230821ak - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230821ak/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230821ak/view/"
},
"event": {
"far": 4.85206e-06,
"time": "2023-08-21T07:38:41.316Z",
"group": "Burst",
"search": "BBH",
"area_50": 922.3837160870726,
"area_90": 3302.620493905942,
"duration": 0.022249,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "8f4940232cdf734794c9540500028525",
"classification": {},
"skymap_version": 0,
"central_frequency": 65.872314
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-21T07:40:00Z",
"superevent_id": "S230821ak",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-21T07:40:01.110133Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-21T07:40:01.110168Z",
"modified": "2023-08-21T07:40:01.116210Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2284,
"topic": "igwn.gwalert",
"uuid": "c8c79c75-ea23-4747-bf6e-c53cd7f3af73",
"title": "S230821ak - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230821ak/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230821ak/view/"
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"event": {
"far": 4.85206e-06,
"time": "2023-08-21T07:38:41.316Z",
"group": "Burst",
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"area_50": 922.3837160870726,
"area_90": 3302.620493905942,
"duration": 0.022249,
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"sequence_num": 2,
"time_created": "2023-08-21T07:44:34Z",
"superevent_id": "S230821ak",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-21T07:44:35.006858Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-21T07:44:35.006877Z",
"modified": "2023-08-21T07:44:35.010542Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2285,
"topic": "igwn.gwalert",
"uuid": "88704835-96c1-437c-9537-6755666426e3",
"title": "S230821am - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230821am/files/cwb.multiorder.fits,0",
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"event": {
"far": 1.92766e-05,
"time": "2023-08-21T07:45:17.735Z",
"group": "Burst",
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"area_50": 845.1687007276453,
"area_90": 3151.5476377679324,
"duration": 0.015056,
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},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-21T07:46:31Z",
"superevent_id": "S230821am",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-21T07:46:32.231289Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-21T07:46:32.231309Z",
"modified": "2023-08-21T07:46:32.234781Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2286,
"topic": "igwn.gwalert",
"uuid": "94c2cdaf-da63-4e41-8fd9-60a04fdd1806",
"title": "S230821am - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230821am/files/cwb.multiorder.fits,0",
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},
"event": {
"far": 1.92766e-05,
"time": "2023-08-21T07:45:17.735Z",
"group": "Burst",
"search": "AllSky",
"area_50": 845.1687007276453,
"area_90": 3151.5476377679324,
"duration": 0.015056,
"pipeline": "CWB",
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"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-21T07:51:05Z",
"superevent_id": "S230821am",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-21T07:51:05.933966Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-21T07:51:05.933994Z",
"modified": "2023-08-21T07:51:05.937959Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2287,
"topic": "gcn.circular",
"uuid": "49f5b053-a45b-40bf-9b30-129b41ece24b",
"title": "GRB 230820A: AstroSat CZTI detection",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "23/08/21 08:17:12 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"title": "GCN CIRCULAR",
"number": "34505",
"subject": "GRB 230820A: 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 long GRB 230820A which was also detected by Konus Wind (reported through IPN_RAW notices).\n\nThe source was clearly detected in the 20-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2023-08-20 11:05:11.65 UTC. The measured peak count rate associated with the burst is 1594 (+233, -173) counts/s above the background in the combined data of all quadrants, with a total of 1625 (+217, -130) counts. The local mean background count rate was 457 (+7, -14) counts/s. Using cumulative rates, we measure a T90 of 4.9 (+0.2, -0.1) s.\n\nThe source was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2023-08-20 11:05:12.25 UTC. The measured peak count rate associated with the burst is 1477 (+88, -95) counts/s above the background in the combined data of all quadrants, with a total of 4814 (+453, -495) counts. The local mean background count rate was 1440 (+7, -8) counts/s. We measure a T90 of 8.5 (+4.0, -3.0) 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNjA1ODM4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.zfVTSyXgbDrTiQ20Mu8zufAElehYnHmgiVRI1vJCp1M\n\n",
"published": "2023-08-21T08:17:27.928599Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-21T08:17:27.928617Z",
"modified": "2023-08-21T08:17:27.933320Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2288,
"topic": "igwn.gwalert",
"uuid": "92063be6-d1df-4f3c-a568-072dda95a163",
"title": "S230821ar - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230821ar/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230821ar/view/"
},
"event": {
"far": 2.798209997038218e-06,
"time": "2023-08-21T09:27:14.166Z",
"group": "CBC",
"search": "AllSky",
"area_50": 544.2819289194418,
"area_90": 1922.8217411787834,
"duration": null,
"pipeline": "pycbc",
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"BNS": 0.00251727300419889,
"NSBH": 0.004184691888254281,
"Terrestrial": 0.9932980351075469
},
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"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-21T09:27:42Z",
"superevent_id": "S230821ar",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-21T09:27:43.320091Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-21T09:27:43.320110Z",
"modified": "2023-08-21T09:27:43.325970Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2289,
"topic": "gcn.circular",
"uuid": "94925c63-d9a1-48ec-be54-7d7d69f4a34d",
"title": "Swift GRB230820.80: 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": "23/08/21 09:28:36 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34506",
"subject": "Swift GRB230820.80: 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 GRB230820.80 (trigger No 1186291,05h 37m 16.99s , +22d 59m 15.4s, R=0.05) errorbox 49381 sec after notice time and 49607 sec after trigger time at 2023-08-21 08:56:23 UT, with upper limit up to 15.3 mag. The observations began at zenith distance = 72 deg. The sun altitude is -28.0 deg.\n\nThe galactic latitude b = -4 deg., longitude l = 184 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"57030\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 49698 | MASTER-OAFA | C | 180 | 13.5 |\n 49698 | MASTER-OAFA | C | 180 | 13.5 |\n 50102 | MASTER-OAFA | C | 180 | 12.4 |\n 50102 | MASTER-OAFA | C | 180 | 12.4 |\n 50501 | MASTER-OAFA | C | 180 | 14.6 |\n 50501 | MASTER-OAFA | C | 180 | 14.6 |\n 50701 | MASTER-OAFA | C | 180 | 14.7 |\n 50701 | MASTER-OAFA | C | 180 | 14.7 |\n 50924 | MASTER-OAFA | C | 180 | 15.3 |\n 50924 | MASTER-OAFA | C | 180 | 15.3 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNjEwMTIxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.V5H876FawdZ9iA1uKZrbeZAL6SuT9DUX2-im39-CAfU\n\n",
"published": "2023-08-21T09:28:47.437855Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-21T09:28:47.437872Z",
"modified": "2023-08-21T09:28:47.442370Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2290,
"topic": "igwn.gwalert",
"uuid": "b9e5b786-b284-4e82-bed3-4fbdabc57b5c",
"title": "S230821ar - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230821ar/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230821ar/view/"
},
"event": {
"far": 2.798209997038218e-06,
"time": "2023-08-21T09:27:14.166Z",
"group": "CBC",
"search": "AllSky",
"area_50": 544.2819289194418,
"area_90": 1922.8217411787834,
"duration": null,
"pipeline": "pycbc",
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"NSBH": 0.004184691888254281,
"Terrestrial": 0.9932980351075469
},
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"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-21T09:32:18Z",
"superevent_id": "S230821ar",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-21T09:32:19.071468Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-21T09:32:19.071488Z",
"modified": "2023-08-21T09:32:19.074921Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2291,
"topic": "gcn.circular",
"uuid": "a96eca90-2724-471b-8c8d-6de9f357895d",
"title": "Swift GRB230820.81: 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": "23/08/21 10:02:56 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34507",
"subject": "Swift GRB230820.81: 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-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 GRB230820.81 (trigger No 1186294,08h 51m 32.52s , -42d 08m 30.1s, R=0.05) errorbox 51431 sec after notice time and 51531 sec after trigger time at 2023-08-21 09:47:23 UT, with upper limit up to 15.1 mag. The observations began at zenith distance = 67 deg. The sun altitude is -17.0 deg.\n\nThe galactic latitude b = 2 deg., longitude l = 263 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"57036\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 51621 | MASTER-OAFA | C | 180 | 15.1 |\n 51831 | MASTER-OAFA | C | 180 | 14.9 |\n 51831 | MASTER-OAFA | C | 180 | 14.9 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNjEyMTgxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Mpa1NLK8ZeMwVQP5sY768l4KdF50gOotAlTq_Qvgbcg\n\n",
"published": "2023-08-21T10:03:06.234945Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-21T10:03:06.234962Z",
"modified": "2023-08-21T10:03:06.242004Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2292,
"topic": "igwn.gwalert",
"uuid": "792bb5ab-b39e-472c-ab43-f568154cf5c7",
"title": "S230821aw - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230821aw/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230821aw/view/"
},
"event": {
"far": 1.47384e-05,
"time": "2023-08-21T11:25:06.814Z",
"group": "Burst",
"search": "AllSky",
"area_50": 1715.5162108116251,
"area_90": 6326.595497601777,
"duration": 0.01086,
"pipeline": "CWB",
"properties": {},
"instruments": [
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"L1"
],
"significant": false,
"skymap_hash": "778b38789044f5d515a3ab7747d212fb",
"classification": {},
"skymap_version": 0,
"central_frequency": 633.908691
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-21T11:26:32Z",
"superevent_id": "S230821aw",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-21T11:26:33.706192Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-21T11:26:33.706239Z",
"modified": "2023-08-21T11:26:33.717282Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2293,
"topic": "igwn.gwalert",
"uuid": "379af0c7-7425-4e26-b89b-385bf48b2c4d",
"title": "S230821aw - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230821aw/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230821aw/view/"
},
"event": {
"far": 1.47384e-05,
"time": "2023-08-21T11:25:06.814Z",
"group": "Burst",
"search": "AllSky",
"area_50": 1715.5162108116251,
"area_90": 6326.595497601777,
"duration": 0.01086,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "778b38789044f5d515a3ab7747d212fb",
"classification": {},
"skymap_version": 0,
"central_frequency": 633.908691
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-21T11:31:07Z",
"superevent_id": "S230821aw",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-21T11:31:08.405424Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-21T11:31:08.405443Z",
"modified": "2023-08-21T11:31:08.409095Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2294,
"topic": "gcn.circular",
"uuid": "ccfb4ebd-35f2-46b3-9117-b88627c17b17",
"title": "GRB 230812B : GRANDMA/Kilonova-Catcher optical afterglow detection and upper limits",
"submitter": "Hop gcn.circular",
"authors": "Damien Turpin at CEA-Saclay <dturpin-astro@hotmail.com>",
"data": {
"date": "23/08/21 13:15:22 GMT",
"from": "Damien Turpin at CEA-Saclay <dturpin-astro@hotmail.com>",
"title": "GCN CIRCULAR",
"number": "34508",
"subject": "GRB 230812B : GRANDMA/Kilonova-Catcher optical afterglow detection and upper limits"
},
"message_text": "D. Turpin (CEA), M. Serrau (KNC), S. Leonini (KNC), M. Freeberg (KNC),\nF. D. Romanov (KNC), S. Karpov (FZU), S. Antier (OCA/Artemis) report\non behalf of the GRANDMA/Kilonova-Catcher collaboration:\n\nThe Kilonova-Catcher telescope network responded to the alert of\nGRB 230812B (Fermi GBM detection: Roberts et al., GCN 34391;\nFermi LAT detection: Scotton et al., GCN 34392).\n\nThe KNC observations were taken by M. Serrau at the Chante-Perdrix\nObservatory (France), S. Leonini at the Montarrenti Observatory (Italy),\nM. Freeberg at the Hidden Valley Observatory (USA) and F.~D. Romanov at the\niTelescope.Net in Sierra Remote Observatory (USA).\nThe afterglow is first detected in 50x30s R-band coadded images at\nabout 1 day (midtime of the exposure) after the Fermi/GBM trigger time.\n\nBelow, we report a subset of our photometric measurements.\n---------------------------------------------------------------------------------\nT-T0 (midtime,day) |Exposure| Filter | Mag +/- err |Mag.Lim. (5sig AB) |Observer\n---------------------------------------------------------------------------------\n1.024 | 50 x 30s | Rc | 20.35 +/- 0.16 | -- | Leonini\n1.164 | 15 x 180s | V | 20.74 +/- 0.08 | -- | Serrau\n1.182 | 30 x 180s | Rc | 20.87 +/- 0.15 | -- | Serrau\n1.425 | 6 x 300s | Ic | -- | 18.6 | Romanov\n2.334 | 12 x 300s | r | -- | 20.6 | Freeberg\n2.397 | 12 x 300s | i | -- | 19.3 | Freeberg\n2.624 | 30 x 180s | Rc | 21.29 +/- 0.11 | -- | Serrau\n4.080 | 40 x 180s | V | 22.20 +/- 0.21 | -- | Serrau\n\nOur detections are consistent with the fading behavior previously reported\nby GRANDMA Mao et al., GCN 34404; Pyshna et al., GCN 34425. We note that\nthe underlying host galaxy may contribute to our late photometric\nmeasurements. The reported magnitudes are not corrected for the galactic\ndust extinction in the line of sight of the burst.\n\nThe GRANDMA/Kilonova-Cacther images have been calibrated using field\nstars from the PanSTARRS-DR1 catalog using the STDpipe pipeline\n(Karpov 2022) and the ps1/r to Rc mag conversion from (Pancino et al. 2022).\n\nGRANDMA is a worldwide telescope network (grandma.ijclab.in2p3.fr)\ndevoted to the observation of transients in the context of multi-messenger\nastrophysics (Antier et al. 2020 MNRAS 497, 5518). Kilonova-Catcher (KNC) is\nthe citizen science program of GRANDMA (http://kilonovacatcher.in2p3.fr/).\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNjIzNzI4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.YSbL7F_7Rm2GNUVqzAlgp9WeWnFSY_CLcE3cC0aKSh4\n\n",
"published": "2023-08-21T13:15:33.552295Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-21T13:15:33.552311Z",
"modified": "2023-08-21T13:15:33.558486Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2295,
"topic": "gcn.circular",
"uuid": "1fdcea55-2fa6-44c0-9268-172501558983",
"title": "Swift triggers 1186294-1186304 are not astrophysical transients",
"submitter": "Hop gcn.circular",
"authors": "P.A. Evans at U. Leicester <pae9@leicester.ac.uk>",
"data": {
"date": "23/08/21 14:33:38 GMT",
"from": "P.A. Evans at U. Leicester <pae9@leicester.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34509",
"subject": "Swift triggers 1186294-1186304 are not astrophysical transients"
},
"message_text": "P.A. Evans (U. Leicester) reports on behalf of the Swift team.\n\nFurther to GCN Circ. 34502, the subsequent BAT triggers: 1186294, 1186295, 1186296, 1186302 and 1186304 were not caused by astrophysical transients but arose due to the star tracker loss of lock. These events should be disregarded.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNjI4NDIzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.aG3ZZpqfFBx0gkDV5cDafEyOmAyLzBXTB1WGRf4CTQ0\n\n",
"published": "2023-08-21T14:33:48.941049Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-21T14:33:48.941067Z",
"modified": "2023-08-21T14:33:48.947098Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2296,
"topic": "igwn.gwalert",
"uuid": "7b34f251-5493-4adc-b77f-9ac649ac414f",
"title": "S230821bh - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230821bh/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230821bh/view/"
},
"event": {
"far": 1.537408e-05,
"time": "2023-08-21T14:56:52.062Z",
"group": "CBC",
"search": "AllSky",
"area_50": 696.4039021139658,
"area_90": 3068.457566892026,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.5895551813043801,
"HasRemnant": 0.06013140604678977
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "533227fdc1b77e791e7d3f8f687c0334",
"classification": {
"BBH": 0.0,
"BNS": 0.000825633,
"NSBH": 0.000154493,
"Terrestrial": 0.999019874
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-21T14:57:22Z",
"superevent_id": "S230821bh",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-21T14:57:23.496794Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-21T14:57:23.496822Z",
"modified": "2023-08-21T14:57:23.502498Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2297,
"topic": "igwn.gwalert",
"uuid": "49c1ac52-ada2-481c-af66-04574803d0d1",
"title": "S230821bh - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230821bh/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230821bh/view/"
},
"event": {
"far": 1.537408e-05,
"time": "2023-08-21T14:56:52.062Z",
"group": "CBC",
"search": "AllSky",
"area_50": 696.4039021139658,
"area_90": 3068.457566892026,
"duration": null,
"pipeline": "MBTA",
"properties": {
"HasNS": 1.0,
"HasMassGap": 0.5895551813043801,
"HasRemnant": 0.06013140604678977
},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "533227fdc1b77e791e7d3f8f687c0334",
"classification": {
"BBH": 0.0,
"BNS": 0.000825633,
"NSBH": 0.000154493,
"Terrestrial": 0.999019874
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-21T15:01:56Z",
"superevent_id": "S230821bh",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-21T15:01:58.117514Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-21T15:01:58.117534Z",
"modified": "2023-08-21T15:01:58.122202Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2298,
"topic": "gcn.circular",
"uuid": "085315c2-133f-49ec-893a-3a3d0fe092c4",
"title": "Swift Trigger 1186386 is not a GRB",
"submitter": "Hop gcn.circular",
"authors": "Boris Sbarufatti at INAF-OAB <boris.sbarufatti@inaf.it>",
"data": {
"date": "23/08/21 15:09:06 GMT",
"from": "Boris Sbarufatti at INAF-OAB <boris.sbarufatti@inaf.it>",
"title": "GCN CIRCULAR",
"number": "34510",
"subject": "Swift Trigger 1186386 is not a GRB"
},
"message_text": "\nB. Sbarufatti (INAF-OAB) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nSwift BAT triggers 1186386 at 14:52:00 UT on 2023-08-21, is due to\nmisidentification of a known source during a Star Tracker\nLoss-of-Lock. It is not an astrophysical event.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNjMwNTUxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.6x1WNJ3DBXp1qEAaoVTciIYhEqa-2AoFfy3FxtsuWNQ\n\n",
"published": "2023-08-21T15:09:21.215051Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-21T15:09:21.215076Z",
"modified": "2023-08-21T15:09:21.218796Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2299,
"topic": "gcn.circular",
"uuid": "66f2315d-7760-4e5d-a147-e7435b200c0c",
"title": "Konus-Wind detection of GRB 230818A",
"submitter": "Hop gcn.circular",
"authors": "Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>",
"data": {
"date": "23/08/21 15:16:55 GMT",
"from": "Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>",
"title": "GCN CIRCULAR",
"number": "34511",
"subject": "Konus-Wind detection of GRB 230818A"
},
"message_text": "D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin,\nA. Tsvetkova, M. Ulanov, and T. Cline,\non behalf of the Konus-Wind team, report:\n\nThe long GRB 230818A (Swift detection: Tohuvavohu et al., GCN 34479;\nFermi GBM observation: Veres et al., GCN 34501)\ntriggered Konus-Wind (KW) at T0=84458.443 s UT (23:27:38.443).\n\nThe burst light curve shows a single FRED-like pulse\nwhich starts at ~T0-0.256 s and has a duration of ~10 s.\nThe emission is seen up to ~2 MeV.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB230818_T84458/\n\nAs observed by Konus-Wind, the burst had\na total fluence of (4.91 ± 1.76)x10^-6 erg/cm^2 and\na 64-ms peak energy flux, measured from T0,\nof (3.08 ± 0.90)x10^-6 erg/cm^2/s (both in the 20 keV - 10 MeV energy range).\n\nThe time-integrated spectrum of the burst (measured from T0 to T0+16.640 s)\nis best fit in the 20 keV - 15 MeV range by a power law with exponential\ncutoff (CPL) model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)\nwith alpha = -1.00(-0.23,+0.27) and Ep = 251(-49,+81) keV (chi2 = 91/98 dof).\nFitting this spectrum by a Band function yields the same values of alpha and Ep,\nand an upper limit on the high energy photon index beta of -2.5 (chi2 = 91/97 dof).\n\nThe spectrum near the peak count rate (measured from T0 to T0+0.256 s)\nis best fit in the 20 keV - 15 MeV range by a CPL model\nwith alpha = -0.40(-0.44,+0.56) and Ep = 259(-45,+64) keV (chi2 = 18/17 dof).\nFitting this spectrum by a Band function yields the same values of alpha and Ep,\nand an upper limit on the high energy photon index beta of -2.7 (chi2 = 18/16 dof).\n\nAssuming the redshift z=2.42 (Malesani et al., GCN 34485)\nand a standard cosmology with H_0 = 67.3 km/s/Mpc, Omega_M = 0.315,\nand Omega_Lambda = 0.685 (Planck Collaboration, 2014),\nwe estimate the burst isotropic energy release E_iso to (6.95 ± 2.49)x10^52 erg,\nthe isotropic peak luminosity L_iso to (1.49 ± 0.44)x10^53 erg/s,\nthe rest-frame peak energy of the time-integrated spectrum Ep,i,z to ~860 keV,\nand the rest-frame peak energy at the peak of the emission Ep,p,z to ~890 keV.\nWith the obtained estimates, GRB 230818A is inside 90% prediction band for\nthe 'Amati' relation and inside 68% prediction band for the 'Yonetoku' relation\nderived for the sample of >300 long KW GRBs with known redshifts\n(Tsvetkova et al., 2017; Tsvetkova et al., 2021), see\nhttp://www.ioffe.ru/LEA/GRBs/GRB230818_T84458/GRB230818A_rest_frame.pdf\n\nAll the quoted errors are estimated at the 68% confidence level.\nAll the presented results are preliminary.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNjMxMDIwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.0LM2FpHJ8un1O6ekmh6t5JvSbZjIE3qq9PR-2F93vwE\n\n",
"published": "2023-08-21T15:17:06.321075Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-21T15:17:06.321118Z",
"modified": "2023-08-21T15:17:06.325773Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2300,
"topic": "gcn.circular",
"uuid": "603084b6-cb42-4fed-b2cf-dc4326742b27",
"title": "Swift Trigger 1186390 is not a GRB",
"submitter": "Hop gcn.circular",
"authors": "Boris Sbarufatti at INAF-OAB <boris.sbarufatti@inaf.it>",
"data": {
"date": "23/08/21 15:21:52 GMT",
"from": "Boris Sbarufatti at INAF-OAB <boris.sbarufatti@inaf.it>",
"title": "GCN CIRCULAR",
"number": "34512",
"subject": "Swift Trigger 1186390 is not a GRB"
},
"message_text": "\nB. Sbarufatti (INAF-OAB) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nSwift BAT trigger 1186390 at 15:12:00.13 UT on 2023-08-21, is due\nto misidentification of a known source during a Star Tracker\nLoss-of-Lock. It is not an astrophysical event.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNjMxMzE0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.0AVOvg5wN5NmkmvV__k11tImrQzsBHAsVIDLwXoWgio\n\n",
"published": "2023-08-21T15:22:00.017855Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-21T15:22:00.017873Z",
"modified": "2023-08-21T15:22:00.046811Z",
"nonlocalizedevents": [],
"targets": []
}
]
}
