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{
"count": 257459,
"next": "https://hermes.lco.global/api/v0/messages/?format=api&limit=100&offset=800&ordering=topic",
"previous": "https://hermes.lco.global/api/v0/messages/?format=api&limit=100&offset=600&ordering=topic",
"results": [
{
"id": 2113,
"topic": "gcn.circular",
"uuid": "95cfec3e-4f54-4ab5-be6c-6b2b39004c44",
"title": "GRB 230812B: iTelescope optical upper limit",
"submitter": "Hop gcn.circular",
"authors": "Filipp Dmitrievich Romanov at Amateur astronomer <filipp.romanov.27.04.1997@gmail.com>",
"data": {
"date": "23/08/16 04:27:25 GMT",
"from": "Filipp Dmitrievich Romanov at Amateur astronomer <filipp.romanov.27.04.1997@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34443",
"subject": "GRB 230812B: iTelescope optical upper limit"
},
"message_text": "I observed the field of GRB 230812B (Fermi GBM team, GCN Circ. 34386)\nremotely using telescope T24 (0.61-m f/6.5 reflector + CCD) of\niTelescope.Net in Sierra Remote Observatory (Auberry, California, USA)\non 2023-08-14. Six images (exposures 300 seconds, BINx1) were obtained\nwith Ic filter with mid time 05:10:04 UT (1.424 d. after the trigger).\nI did not detect any optical afterglow in the Swift/XRT (Page, GCN\nCirc. 34394) position. The magnitude limit is about 19 mag, compared\nto the magnitudes of nearby stars from the USNO-B1.0 Catalog (Monet et\nal., 2003).\nF. D. Romanov (AAVSO member, observer code: RFDA).\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMTYwMDUxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Xqu0ElXuKBHiz66B3Z4uebud1veXQo30TqmkGoOZROM\n\n",
"published": "2023-08-16T04:27:41.416224Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-16T04:27:41.416243Z",
"modified": "2023-08-16T04:27:41.422068Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2114,
"topic": "gcn.circular",
"uuid": "69178fb3-f156-4bb7-98ae-40345ad6ea5a",
"title": "GRB 230815A: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/08/16 05:16:53 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34444",
"subject": "GRB 230815A: Swift-XRT refined Analysis"
},
"message_text": "P. D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB), D.N. Burrows (PSU),\nJ. D. Gropp (PSU), S. Dichiara (PSU), J.P. Osborne (U. Leicester), K.L.\nPage (U. Leicester), A.P. Beardmore (U. Leicester), E. Ambrosi\n(INAF-IASFPA) and P.A. Evans report on behalf of the Swift-XRT team:\n\nWe have analysed 6.0 ks of XRT data for GRB 230815A, from 117 s to 45.2\nks after the BAT trigger. The data comprise 574 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 late-time light curve (from T0+6.1 ks) can be modelled with a\npower-law decay with a decay index of alpha=1.94 (+0.25, -0.29).\n\nA spectrum formed from the WT mode data can be fitted with an absorbed\npower-law with a photon spectral index\tof 1.92 (+0.06, -0.05). The\nbest-fitting absorption column is 7.4 (+0.5, -0.4) x 10^21 cm^-2, in\nexcess of the Galactic value of 4.9 x 10^21 cm^-2 (Willingale et al.\n2013). The PC mode spectrum has a photon index of 1.94 (+0.18, -0.17)\nand a best-fitting absorption column of 9.1 (+1.7, -1.5) x 10^21 cm^-2.\nThe counts to observed (unabsorbed) 0.3-10 keV flux conversion factor\ndeduced from this spectrum is 4.9 x 10^-11 (8.5 x 10^-11) erg cm^-2\ncount^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 9.1 (+1.7, -1.5) x 10^21 cm^-2\nGalactic foreground: 4.9 x 10^21 cm^-2\nExcess significance: 4.5 sigma\nPhoton index:\t 1.94 (+0.18, -0.17)\n\nIf the light curve continues to decay with a power-law decay index of\n1.94, the count rate at T+24 hours will be 2.5 x 10^-3 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.2 x\n10^-13 (2.1 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/01185505.\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMTYzMDE5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.DLSHPo9VF6zEazZinrDfrbnp9ltSupv12z7F_Xns4IA\n\n",
"published": "2023-08-16T05:17:05.400216Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-16T05:17:05.400236Z",
"modified": "2023-08-16T05:17:05.405946Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2126,
"topic": "gcn.circular",
"uuid": "3bd2308c-6493-47a1-bdf5-8560f1cc2cd3",
"title": "GRB 230812B: GAD Observatory optical observations (upper limit)",
"submitter": "Hop gcn.circular",
"authors": "Claudio Lopresti <cl3lop@gmail.com>",
"data": {
"date": "23/08/16 10:38:15 GMT",
"from": "Claudio Lopresti <cl3lop@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34445",
"subject": "GRB 230812B: GAD Observatory optical observations (upper limit)"
},
"message_text": "Claudio Lopresti (Gruppo Astronomia Digitale - GAD Observatory, La Spezia, Italy),\nin a large collaboration with:\nM.G. Dainotti (National Astronomical Observatory of Japan),\nY. Niino (Tokyo University, Institute of Astronomy),\nK. Kalinowski (Aarhus University, Department of Physics and Astronomy),\nB. De Simone (Universita' degli Studi Di Salerno)\nreport:\n\nI imaged the field of GRB 230812B (Lesage et al., GCN 34387;\nScotton et al., GCN 34392; Page, GCN 34394; Zheng & Filippenko, GCN 34395;\nLipunov et al., GCN 34396; Salgundi et al., GCN 34397; Ackley et al., GCN 34398;\nXiong et al., GCN 34401; Casentini et al., GCN 34002; Frederiks et al., GCN 34403;\nMao et al., GCN 34404; Odeh et al., GCN 34405; Moskvitin et al., GCN 34406)\ndetected by FERMI(trigger 713559497.049606 / 230812790)\nwith the GAD Observatory, La Spezia, Italy Italy.\n\nMember of:\nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili, GRB section\nGAD - Gruppo Astronomia Digitale\n\nThe observations started 48.02 hour after the FERMI trigger, At the end of twilight\nwith a Maksutov-Newton telescope D\u00180 mm F/D=4\n\nWeather conditions were good.\n\nWe co-added series of 8 exposures of 60 sec each.\n\nStart T0+ End T0+ R lim\n3168 min 3178 min 19.6\n\nI did not detect any optical afterglow in the Swift/XRT (Page, GCN\nCirc. 34387) position. The magnitude limit is about 19.5 mag, compared\nto the magnitudes of nearby stars from the Gaia EDR3 Catalog\n\nMagnitudes were estimated with the Gaia EDR3 cat. and\nare not corrected for galactic dust extinction.\n\nReference:\nhttps://www.parcodellestelle.com/\n\nThe message may be cited.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMTgyMzAxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.SCQshQeHnS3RHRPPp9LvlTQl_NWLMXBqNYxGQ6rm01Q\n\n",
"published": "2023-08-16T10:38:28.416652Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-16T10:38:28.416669Z",
"modified": "2023-08-16T10:38:28.421297Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2129,
"topic": "gcn.circular",
"uuid": "71b68bc6-13d7-4f50-a040-6010e7ffeda0",
"title": "GRB230815A: Swift/UVOT upper limits",
"submitter": "Hop gcn.circular",
"authors": "Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>",
"data": {
"date": "23/08/16 12:42:08 GMT",
"from": "Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34446",
"subject": "GRB230815A: Swift/UVOT upper limits"
},
"message_text": "A. A. Breeveld (UCL-MSSL) and N. J. Klingler (GSFC/UMBC/CRESSTII) report on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 230815A 155 s after the BAT trigger (Klingler et al., GCN Circ. 34434).\nNo optical afterglow consistent with the XRT position (Beardmore et al., GCN Circ. 34437) is detected in the initial UVOT exposures.\nPreliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent summed exposures are:\n\nFilter T_start(s) T_stop(s) Exp(s) Mag\n\nwhite_FC 155 305 147 >20.1\nwhite 513 1531 242 >20.3\nv 390 1582 136 >18.5\nb 489 1506 114 >19.3\nu 464 6300 293 >19.4\nuvw1 439 1632 136 >18.6\nuvm2 761 1606 97 >18.3\nuvw2 365 1557 136 >18.8\n\nThe magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.73 in the direction of the burst (Schlegel et al. 1998).\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMTg5NzMzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.wbAGqUBbgQg1iExM3e58M3bx0cY91Vsvz--4Awl8lMw\n\n",
"published": "2023-08-16T12:42:19.835160Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-16T12:42:19.835178Z",
"modified": "2023-08-16T12:42:19.838934Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2575,
"topic": "gcn.circular",
"uuid": "d8a6f0e8-8bb2-4854-9940-040a9b4d8b3f",
"title": "GRB 230827B: CALET Gamma-Ray Burst Monitor detection",
"submitter": "Hop gcn.circular",
"authors": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"data": {
"date": "23/08/29 15:56:27 GMT",
"from": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"title": "GCN CIRCULAR",
"number": "34593",
"subject": "GRB 230827B: CALET Gamma-Ray Burst Monitor detection"
},
"message_text": "T. Tamura (Kanagawa U), A. Yoshida, T. Sakamoto, S. Sugita (AGU),\nY. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA),\nY. Asaoka (ICRR), S. Torii, Y. Akaike, K. Kobayashi (Waseda U),\nY. Shimizu (Kanagawa U), N. Cannady (GSFC/UMBC),\nM. L. Cherry (LSU), S. Ricciarini (U of Florence),\nP. S. Marrocchesi (U of Siena),\nand the CALET collaboration:\n\nThe long GRB 230827B (Fermi GBM Observation: Hamburg et al.,\nGCN Circ. 34584; VZLUSAT-2 detection: Dafcikova et al., GCN\nCirc. 34585) triggered the CALET Gamma-ray Burst Monitor (CGBM)\nat 06:08:28.36 UTC on 27 July 2023\n(http://cgbm.calet.jp/cgbm_trigger/flight/1377151581/).\nThe burst signal was seen by only the SGM detector.\n\nThe burst light curve shows a multi-peaked structure that starts\nat T+2.3 sec, peaks at T+2.7 sec, and ends at T+87.7 sec.\nThe T90 and T50 durations measured by the SGM data are 79.6 +/- 3.7 sec\nand 57.4 +/- 2.5 sec (40-1000 keV), respectively.\n\nThe ground-processed light curve is available at\n\n http://cgbm.calet.jp/cgbm_trigger/ground/1377151581/\n\nThe CALET data used in this analysis are provided by\nthe Waseda CALET Operation Center located at Waseda University.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMzI0NTkzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.zAmDBJiI0AFGCB6aiLDD2u0Hj1PLMVgD3HdcKvGlOTU\n\n",
"published": "2023-08-29T15:56:37.878357Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-29T15:56:37.878385Z",
"modified": "2023-08-29T15:56:37.882226Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2130,
"topic": "gcn.circular",
"uuid": "c0ed5c67-0f0f-4045-bd09-b734ed9cd9ec",
"title": "GRB 230815B: AstroSat CZTI detection",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "23/08/16 14:06:03 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"title": "GCN CIRCULAR",
"number": "34447",
"subject": "GRB 230815B: 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 a long GRB 230815B which was also detected by GECAM-B (TrigNum 211).\n\nThe source was clearly detected in the 20-200 keV energy range. The light curve peaks at 2023-08-15 16:08:28.5 UTC. The measured peak count rate associated with the burst is 271.4 (+40.4, -41.4) counts/s above the background in the combined data of all quadrants, with a total of 2148 (+375, -381) counts. The local mean background count rate was 335.7 (+2.4, -3.0) counts/s. Using cumulative rates, we measure a T90 of 33.2 (+8.9, -11.6) 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 2023-08-15 16:08:27.3 UTC. The measured peak count rate associated with the burst is 725.5 (+75.8, -66.6) counts/s above the background in the combined data of all quadrants, with a total of 9598 (+1234, -1292) counts. The local mean background count rate was 1481.2 (+5.7, -6.9) counts/s. We measure a T90 of 43.5 (+8.7, -12.6) 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMTk0NzY5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Nl8p1Udn4FKeYVY16Wl7jMj6jgYxEO94fmBtOxklaJ8\n\n",
"published": "2023-08-16T14:06:14.768717Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-16T14:06:14.768746Z",
"modified": "2023-08-16T14:06:14.775069Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2131,
"topic": "gcn.circular",
"uuid": "93918428-7d67-4257-b9bd-438ee81e2bff",
"title": "GRB 230815B: GECAM-B and GECAM-C detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "Yunfei Du at IHEP <duyunfei@ihep.ac.cn>",
"data": {
"date": "23/08/16 14:16:52 GMT",
"from": "Yunfei Du at IHEP <duyunfei@ihep.ac.cn>",
"title": "GCN CIRCULAR",
"number": "34448",
"subject": "GRB 230815B: GECAM-B and GECAM-C detection of a burst"
},
"message_text": "Shaolin Xiong, Yanqiu Zhang, Yue Huang report on behalf of the GECAM team:\n\nGECAM-B and GECAM-C were triggered in-flight by a long burst, GRB 230815B,\nat 2023-08-15T16:07:29.150 UTC and 2023-08-15T16:07:29.350 UTC, respetively,\nwhich was also observed by INTEGRAL/SPI-ACS and Konus-Wind.\n\nAccording to the realtime alert data of GECAM-B and GECAM-C, this burst\nmainly consists of a bright short pulse followed by a broad pulse with\na total duration (T90) of about ~30 sec (15-1000 keV).\n\nUsing the automatic on-ground localization pipeline with the realtime alert data,\nGECAM-B localized this burst to the following position (J2000):\nRA: 325.9 deg\nDEC: 13.2 deg\nErr: 5.1 deg (1-sigma, statistical only)\nThe systematic error of this location is estimated to be several degrees.\n\nThe time-averaged spectrum of GECAM-B realtime data shows that it could be\nadequately fit by a Band function with a fluence about 1.6E-5 erg/cm^2 in 20-1000 keV.\n\nWe note that these results are based on realtime alert data and thus very preliminary.\nRefined analysis will be reported later.\n\nGravitational wave high-energy Electromagnetic Counterpart All-sky Monitor\n(GECAM) mission originally consists of two microsatellites (GECAM-A and GECAM-B)\nlaunched in Dec. 2020. As the third member of GECAM constellation,\nGECAM-C was launched onboard SATech-01 experimental satellite in July 2022.\nGECAM mission is funded by the Chinese Academy of Sciences (CAS).\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMTk1NDE4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.uooeNNDYBWNHJ1JXyGAgk7_LKgeJ4FjOkpCDKnZAlhE\n\n",
"published": "2023-08-16T14:17:02.547273Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-16T14:17:02.547293Z",
"modified": "2023-08-16T14:17:02.551613Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2576,
"topic": "gcn.circular",
"uuid": "83a4ad3f-436d-4987-bf4b-f838d01c9ec3",
"title": "GRB 230827A: Fermi GBM Observation",
"submitter": "Hop gcn.circular",
"authors": "Lorenzo Scotton at UAH <lscottongcn@outlook.com>",
"data": {
"date": "23/08/29 18:29:51 GMT",
"from": "Lorenzo Scotton at UAH <lscottongcn@outlook.com>",
"title": "GCN CIRCULAR",
"number": "34594",
"subject": "GRB 230827A: Fermi GBM Observation"
},
"message_text": "L. Scotton (UAH), C. Fletcher (USRA) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 18:17:52.93 UT on 27 August 2023, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 230827A (trigger 714853077/230827762).\nwhich was also detected by GRBAlpha (Dafcikova et al. 2023, GCN 34583)\nand Swift/BAT GUANO (DeLaunay et al. 2023, GCN 34587).\nThe Fermi GBM Final Real-time Localization was reported in GCN 34575.\n\nThe angle from the Fermi LAT boresight is 95 degrees.\n\nThe GBM light curve consists of multiple peaks with a duration (T90)\nof about 83 s (50-300 keV). The time-averaged spectrum\nfrom T0-1.2 to T0+85.9 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -0.96 +/- 0.03 and the cutoff energy,\nparameterized as Epeak, is 415 +/- 26 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(3.58 +/- 0.08)E-05 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+21 s in the 10-1000 keV band is 10.7 +/- 0.4 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMzMzNzk3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.-7oD-M3iitq6GFkvbt3Gm79bljPTvRV6tpR8q1C4248\n\n",
"published": "2023-08-29T18:30:02.873582Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-29T18:30:02.873598Z",
"modified": "2023-08-29T18:30:02.879601Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2134,
"topic": "gcn.circular",
"uuid": "629cebe0-f0d4-4106-90fd-6b5464606c99",
"title": "GRB 230815A: Swift-BAT refined analysis",
"submitter": "Hop gcn.circular",
"authors": "Tyler Parsotan at NASA GSFC <tyler.parsotan@nasa.gov>",
"data": {
"date": "23/08/16 16:03:55 GMT",
"from": "Tyler Parsotan at NASA GSFC <tyler.parsotan@nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34449",
"subject": "GRB 230815A: Swift-BAT refined analysis"
},
"message_text": "S. Laha (GSFC/UMBC), S. D. Barthelmy (GSFC),\nH. A. Krimm (NSF), A. Y. Lien (U Tampa),\nC. B. Markwardt (GSFC), D. M. Palmer (LANL),\nT. Parsotan (GSFC/UMBC), T. Sakamoto (AGU),\nM. Stamatikos (OSU) (i.e. the Swift-BAT team):\n\n\nUsing the data set from T-240 to T+962 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 230815A (trigger #1185505)\n(Klingler, et al., GCN Circ. 34434). The BAT ground-calculated position is\nRA, Dec = 184.760, -58.067 deg which is\nRA(J2000) = 12h 19m 02.4s\nDec(J2000) = -58d 03' 59.5\"\nwith an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 11%.\n\n\nThe mask-weighted light curve shows a strong peak at trigger time with precursor emission\nAt T-14 sec from trigger. T90 (15-350 keV) is 17.00 +- 7.62 sec (estimated error including systematics).\n\n\nThe time-averaged spectrum from T-14.78 to T+9.22 sec is best fit by a simple\npower-law model. The power law index of the time-averaged spectrum is\n1.19 +- 0.10. The fluence in the 15-150 keV band is 5.2 +- 0.3 x 10^-06 erg/cm2.\nThe 1-sec peak photon flux measured from T+0.22 sec in the 15-150 keV band\nis 13.7 +- 1.1 ph/cm2/sec. All the quoted errors are at the 90% confidence\nlevel.\n\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/1185505/BA/\n\n\n\n\n\n\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMjAxODQxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.qMUvpTU8e0ZEUUr8tDzctdb7ix8d1eLR7ubmrwbeoBc\n\n",
"published": "2023-08-16T16:04:11.591566Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-16T16:04:11.591585Z",
"modified": "2023-08-16T16:04:11.598733Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2135,
"topic": "gcn.circular",
"uuid": "16941dc7-0a14-4890-a304-9921f159d759",
"title": "GRB 230816A: Swift detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "David Palmer at LANL <palmer@lanl.gov>",
"data": {
"date": "23/08/16 16:24:41 GMT",
"from": "David Palmer at LANL <palmer@lanl.gov>",
"title": "GCN CIRCULAR",
"number": "34450",
"subject": "GRB 230816A: Swift detection of a burst"
},
"message_text": "\nM. H. Siegel (PSU), S. Dichiara (PSU),\nR. A. J. Eyles-Ferris (U Leicester), J.D. Gropp (PSU),\nJ. A. Kennea (PSU), F. E. Marshall (NASA/GSFC), M. J. Moss (GWU),\nK. L. Page (U Leicester), D. M. Palmer (LANL),\nT. M. Parsotan (GSFC/UMBC/CRESSTII), B. Sbarufatti (INAF-OAB) and\nM. A. Williams (PSU) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nAt 16:08:48 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 230816A (trigger\u001185673). Swift slewed immediately to the burst.\nThe BAT on-board calculated location is\nRA, Dec 328.375, +37.828 which is\n RA(J2000) = 21h 53m 30s\n Dec(J2000) = +37d 49' 43\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including\nsystematic uncertainty). The BAT light curve showed a single-peaked\nstructure with a duration of about 25 sec. The peak count rate\nwas ~1900 counts/sec (15-350 keV), at ~0 sec after the trigger.\n\nThe XRT began observing the field at 16:10:18.4 UT, 90.2 seconds after\nthe BAT trigger. Using promptly downlinked data we find a fading,\nuncatalogued X-ray source with an enhanced position: RA, Dec 328.44552,\n37.85549 which is equivalent to:\n RA(J2000) = 21h 53m 46.92s\n Dec(J2000) = +37d 51' 19.8\"\nwith an uncertainty of 1.9 arcseconds (radius, 90% containment). This\nlocation is 223 arcseconds from the BAT onboard position. This position\nmay be improved as more data are received; the latest position is\navailable at https://www.swift.ac.uk/sper.\n\nA power-law fit to a spectrum formed from promptly downlinked event\ndata gives a column density in excess of the Galactic value (2.90 x\n10^21 cm^-2, Willingale et al. 2013), with an excess column of 3.7\n(+3.48/-2.91) x 10^21 cm^-2 (90% confidence).\n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 93 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 none of\nthe XRT error circle. The 8'x8' region for the list of sources generated\non-board covers 100% of the XRT error circle. The list of sources is typically\ncomplete to about 18 mag. No correction has been made for the expected\nextinction corresponding to E(B-V) of 0.311.\n\nBurst Advocate for this burst is M. H. Siegel (siegel AT swift.psu.edu).\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMjAzMDg3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.oxQWfLFElhN_wPhq_TLNcMYdMmSME4WDD51177lk7QQ\n\n",
"published": "2023-08-16T16:24:52.652189Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-16T16:24:52.652208Z",
"modified": "2023-08-16T16:24:52.659135Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2136,
"topic": "gcn.circular",
"uuid": "57e049c2-5010-4992-81da-ddd309f031e9",
"title": "Swift GRB230816.67: 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": "23/08/16 17:20:44 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34451",
"subject": "Swift GRB230816.67: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the Swift GRB230816.67 (trigger No 1185673,21h 53m 29.98s , +37d 49m 42.6s, R=0.05) errorbox 2108 sec after notice time and 2130 sec after trigger time at 2023-08-16 16:44:18 UT, with upper limit up to 17.2 mag. The observations began at zenith distance = 15 deg. The sun altitude is -25.0 deg.\n\nThe galactic latitude b = -13 deg., longitude l = 89 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"54998\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 2220 | MASTER-Tunka | C | 180 | 17.2 |\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMjA2NDUwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.trlwNbVx8nTNMsGOVB1DTozxLTI9U9H5lvR_Fn5T0-E\n\n",
"published": "2023-08-16T17:20:56.798889Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-16T17:20:56.798910Z",
"modified": "2023-08-16T17:20:56.805143Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2140,
"topic": "gcn.circular",
"uuid": "de011955-b6d3-4b54-87e6-6252aa3e2bea",
"title": "GRB 230815A: SOAR/Goodman follow-up imaging",
"submitter": "Hop gcn.circular",
"authors": "Charles Kilpatrick at Northwestern U <ckilpatrick@northwestern.edu>",
"data": {
"date": "23/08/16 18:03:23 GMT",
"from": "Charles Kilpatrick at Northwestern U <ckilpatrick@northwestern.edu>",
"title": "GCN CIRCULAR",
"number": "34452",
"subject": "GRB 230815A: SOAR/Goodman follow-up imaging"
},
"message_text": "C. D. Kilpatrick (Northwestern), C. R. Bom (CBPF), A. Santos (CBPF/Fermilab), S. Panda (LNA), Felipe Navarete (NOIRLab/SOAR) on behalf of a larger collaboration, report:\n\nFollowing the detection of GRB230815A (Klingler et al., GCN 34434, Mailyan et al., GCN 34440), we triggered observations with the Goodman high-throughput imaging spectrograph on the SOAR 4.1m telescope at Cerro Pachón, Chile. Targeting the site of the reported Swift/XRT counterpart (Beardmore et al., GCN 34437), we obtained 6x180s exposures in SDSS i-band and 7x180s in SDSS z-band at start times of 2023-08-15 23:17:36 and 2023-08-15 23:50:48 UTC, respectively. We did not detect a counterpart in either stacked image, with the limiting magnitude in both frames significantly affected by poor atmospheric transparency. Performing forced photometry at the site of the XRT counterpart (R.A.=12:18:53.34, Decl.=-58:03:10.4), we derive limits on an optical counterpart of:\n\nMJD Filter Maglimit\n60171.97055 i 20.5\n60171.99361 z 17.9\n\nBoth magnitude limits are on the AB magnitude system calibrated from SkyMapper DR2 standard stars (Onken et al. 2019) and are not corrected for the significant Galactic extinction along this sight line (A_i=1.25 mag, A_z=0.93 mag).\n\nBased on observations obtained at the Southern Astrophysical Research (SOAR) telescope, which is a joint project of the Ministério da Ciência, Tecnologia e Inovações do Brasil (MCTI/LNA), the US National Science Foundationâs NOIRLab, the University of North Carolina at Chapel Hill (UNC), and Michigan State University (MSU).\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMjA5MDA5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.wXEViv7aG_PJYfRNcN1Qs_wejSY8PF3GfkgnhtL2Z_U\n\n",
"published": "2023-08-16T18:03:35.543776Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-16T18:03:35.543795Z",
"modified": "2023-08-16T18:03:35.547709Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2142,
"topic": "gcn.circular",
"uuid": "ba01bdf5-0027-4e68-a2a9-6ed38e53828a",
"title": "GRB 230816A: Nanshan/HMT optical afterglow detection",
"submitter": "Hop gcn.circular",
"authors": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
"data": {
"date": "23/08/16 18:15:50 GMT",
"from": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
"title": "GCN CIRCULAR",
"number": "34453",
"subject": "GRB 230816A: Nanshan/HMT optical afterglow detection"
},
"message_text": "S.Q. Jiang, S.Y. Fu, X. Liu, T.H. Lu, Z.P. Zhu, D. Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:\n\nWe observed the field of GRB 230816A detected by Swift (Siegel et al., GCN 34450) using the HMT-0.5m telescope located at Nanshan, Xinjiang, China. Observations started at 16:10:20 UT on 2023-08-16, i.e., 92 s after the Swift/BAT trigger, we obtained a serise of 3x20, 3x40, 4x60, 12x90 s frames without any filter.\n\nAn uncatalogued optical source is detected in our stacked image at coordinates\n\nR.A. (J2000) = 21:53:46.9\nDec. (J2000) = +37:51:15.9\n\n2.23 arcsec away from the center of the XRT error circle (radius: 1.9 arcsec, 90% containment; Siegel et al., GCN 34450) with m(r) = 19.6 +/- 0.18 mag(AB) at 24.6 min post-burst, calibrated with the nearby PanSTAR field in the Sloan r-filter and the magnitude is not corrected for Galactic extinction. We thus think this OT is the optical afterglow of the burst.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMjA5NzU2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.zJ6HFO4HeuQcc63AQdLOZfkBh35hP0jPE_I2YQVWAwE\n\n",
"published": "2023-08-16T18:16:00.569594Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-16T18:16:00.569613Z",
"modified": "2023-08-16T18:16:00.574604Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2143,
"topic": "gcn.circular",
"uuid": "955c4969-b968-4409-a950-dc0a8a4fd3af",
"title": "IPN triangulation of GRB 230815B",
"submitter": "Hop gcn.circular",
"authors": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
"data": {
"date": "23/08/16 18:47:08 GMT",
"from": "Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>",
"title": "GCN CIRCULAR",
"number": "34454",
"subject": "IPN triangulation of GRB 230815B"
},
"message_text": "A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin\non behalf of the HEND/Mars Odyssey team,\n\nA. Ridnaia, D. Frederiks, D. Svinkin, A. Lysenko,\nand T. Cline on behalf of the Konus-Wind team,\n\nE. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,\n\nS. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu\non behalf of the Swift-BAT team,\n\nand\n\nW. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr,\nand A.S. Gardner on on behalf of the GRS-Odyssey GRB team,\nreport:\n\nThe long-duration GRB 230815B\n(AstroSat CZTI detection: Pari et al., GCN 34447;\nGECAM-B and GECAM-C detection: Xiong et al., GCN 34448)\nhas been detected by Konus-Wind, INTEGRAL (SPI-ACS),\nSwift (BAT), AstroSat (CZTI), GECAM-B, GECAM-C,\nand Mars-Odyssey (HEND), so far, at about 58049 s UT (16:07:29).\nThe burst was outside the coded field of view of the BAT.\n\nWe have triangulated it to a preliminary, 3 sigma error box\nwhose coordinates are:\n ---------------------------------------------\n RA(2000), deg Dec(2000), deg\n ---------------------------------------------\n Center:\n 307.334 (20h 29m 20s) +4.190 ( +4d 11' 24\")\n Corners:\n 307.122 (20h 28m 29s) +2.976 ( +2d 58' 33\")\n 307.518 (20h 30m 04s) +5.411 ( +5d 24' 38\")\n 307.571 (20h 30m 17s) +5.398 ( +5d 23' 53\")\n 307.175 (20h 28m 42s) +2.963 ( +2d 57' 47\")\n ---------------------------------------------\nThe error box area is 487 sq. arcmin, and its maximum\ndimension is 2.5 deg (the minimum one is 3 arcmin).\nThe Sun distance was 154 deg.\n\nThis localization may be improved.\n\nA triangulation map and HEALPix FITS file are posted at\nhttp://www.ioffe.ru/LEA/GRBs/GRB230815_T58054/IPN\n\nThe Konus-Wind time history and spectrum will be given\nin a forthcoming GCN Circular.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMjExNjM0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.fHwFOPmGbhKuoFS8MKtjq1w_NpBzYiaD-Ebq-Tn-Xgs\n\n",
"published": "2023-08-16T18:47:19.123421Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-16T18:47:19.123438Z",
"modified": "2023-08-16T18:47:19.127289Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2144,
"topic": "gcn.circular",
"uuid": "761b8429-ab41-43ab-814b-c192a1811dc8",
"title": "Swift GRB230816.80: 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": "23/08/16 19:18:38 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34455",
"subject": "Swift GRB230816.80: 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-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 GRB230816.80 (trigger No 1185685,19h 59m 06.41s , +35d 20m 26.9s, R=0.05) errorbox 14 sec after notice time and 100 sec after trigger time at 2023-08-16 19:12:28 UT, with upper limit up to 17.5 mag. The observations began at zenith distance = 13 deg. The sun altitude is -22.4 deg.\n\nThe galactic latitude b = 3 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\"55110\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 110 | MASTER-Tavrida | C | 20 | 17.0 |\n 142 | MASTER-Tavrida | C | 30 | 17.5 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMjEzNTI0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.UBKe5GnsdRiTBblw099PaLKfBXJ9G1krqAq8IppZy7A\n\n",
"published": "2023-08-16T19:18:53.113223Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-16T19:18:53.113242Z",
"modified": "2023-08-16T19:18:53.118721Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2153,
"topic": "gcn.circular",
"uuid": "0169afb3-22ab-4fba-9b39-67fd809d3e0c",
"title": "GRB 230816A: Enhanced Swift-XRT position",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/08/17 03:20:23 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34462",
"subject": "GRB 230816A: Enhanced Swift-XRT position"
},
"message_text": "P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester)\nreport on behalf of the Swift-XRT team.\n\nUsing 1206 s of XRT Photon Counting mode data and 1 UVOT\nimages for GRB 230816A, 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 = 328.44568, +37.85495 which is equivalent\nto:\n\nRA (J2000): 21h 53m 46.96s\nDec (J2000): +37d 51' 17.8\"\n\nwith an uncertainty of 2.3 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMjQyNDI4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.tXVQI1ycsoOhVI1jEjo39WYnaLbhvw2ERFIVdkSo_EU\n\n",
"published": "2023-08-17T03:20:38.885544Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-17T03:20:38.885566Z",
"modified": "2023-08-17T03:20:38.891785Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2145,
"topic": "gcn.circular",
"uuid": "bb62681c-5c1f-4b99-941c-8a99f52dfd09",
"title": "GRB 230816A: SAO RAS optical observations",
"submitter": "Hop gcn.circular",
"authors": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"data": {
"date": "23/08/16 19:26:01 GMT",
"from": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"title": "GCN CIRCULAR",
"number": "34456",
"subject": "GRB 230816A: SAO RAS optical observations"
},
"message_text": "A. S. Moskvitin and O. I. Spiridonova (SAO RAS),\nreport on behalf of the GRB follow-up team.\n\nWe observed the field of the GRB 230816A (Siegelet al., GCN 34450)\nwith the 1-m telescope of SAO RAS Zeiss-1000 equipped with the CCD\nphotometer. We obtained 8 x 300 sec. images in Rc band on August 16,\n17:45:41 -- 18:35:29 UT.\n\nThe OT (Jiang et al., GCN 34453) is clearly detected in our stacked\nframe with the coordinates\nR.A. (J2000) = 21:53:46.9,\nDecl.(J2000) = +37:51:16.7 (+/- 0\".5)\nand the brightness of R = 21.0 +/- 0.1 (t_mid - t0 = 2.030h = 0.0846d).\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMjEzOTY3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.ie6eNYwqD0qaw6ONNCpJ-tZrBusYOtVPrrEH9Nzz6W0\n\n",
"published": "2023-08-16T19:26:12.294769Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-16T19:26:12.294788Z",
"modified": "2023-08-16T19:26:12.298813Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2146,
"topic": "gcn.circular",
"uuid": "e2ad4fad-ab00-4938-9df5-88cfb2703494",
"title": "GRB 230816A: TShAO and Assy optical observations",
"submitter": "Hop gcn.circular",
"authors": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"data": {
"date": "23/08/16 20:29:24 GMT",
"from": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"title": "GCN CIRCULAR",
"number": "34457",
"subject": "GRB 230816A: TShAO and Assy optical observations"
},
"message_text": "N. Pankov (HSE, IKI), I. Reva (FAI), V. Kim (FAI), A. Pozanenko (IKI), S. Belkin (IKI) report on behalf of the GRB-IKI-FuN.\n\nWe observed the field of the GRB 230816A (Siegel et al., GCN 34450)\nwith Zeiss-1000 telescope of Tien-Shan Observatory (TShAO) and AZT-20 telescope of Assy Observatory. We clearly detect the afterglow (Jiang et al., GCN 34453; Moskivitin et al., GCN 34456) in the stacked images.\n\nPreliminary photometry is following\n\nDate UT start t-T0 Filter Exp. OT Err. UL(3sigma)\n (mid, days) (s)\n\n2023-08-16 16:21:24 0.034787 R 25*180 19.57 0.10 22.3\n2023-08-16 17:26:29 0.072354 r' 53*60 21.10| 0.025 23.5\n\nThe photometry is based on nearby stars of USNO-B1.0 and PanSTARRS-DR1 catalogues.\nRA Dec R2 r'\n328.5043802 +37.8674441 16.47 16.8245\n328.3579777 +37.8706420 17.04 17.1589\n328.4483771 +37.8290610 15.45 15.3054\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMjE3NzY5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.LwLRzKRQkroot9n7Ja5YtuNEP27kphdrsKKGjaWpEMo\n\n",
"published": "2023-08-16T20:29:34.985501Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-16T20:29:34.985519Z",
"modified": "2023-08-16T20:29:34.989682Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2147,
"topic": "gcn.circular",
"uuid": "bb8a8d11-7323-4215-bfba-a02c11dd3d96",
"title": "GRB 230816A: AKO Optical Observations",
"submitter": "Hop gcn.circular",
"authors": "Mohammad Odeh at Al Khatim Observatory M44 <mshodeh@gmail.com>",
"data": {
"date": "23/08/16 20:58:15 GMT",
"from": "Mohammad Odeh at Al Khatim Observatory M44 <mshodeh@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34458",
"subject": "GRB 230816A: AKO Optical Observations"
},
"message_text": "Mohammad Odeh, Nada Odeh, Osama Ghannam, Anas Mohammad, and Khalfan\nAl-Noaimy, report on behalf of Al-Khatim Observatory (AKO) operated by the\nInternational Astronomical Center in Abu Dhabi, UAE:\n\nWe observed the field of the GRB 230816A (Siegel et al., GCN 34450) with\nour 0.36m f/7.7 robotic telescope. We obtained 21 x 180 sec. images in a\nclear filter on 16 August, from 19:05 to 20:36 UT.\n\nWe detected the afterglow (Jiang et al., GCN 34453; Moskivitin et al., GCN\n34456; Pankov et al., GCN 34457) in our stacked images with the coordinates\n(J2000) R.A.= 21:53:47.01, Dec.= +37:51:16.7 and the brightness of Mv 20.6 +/- 0.27 (t_mid - t0 = 3.7 hours).\n\nThe magnitude is not corrected for galactic extinction.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMjE5NTAxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.67fnhzvrGqjKfwNbaQ-Obp7f1noPdBXj5jzMgA7Mjz0\n\n",
"published": "2023-08-16T20:58:27.153479Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-16T20:58:27.153497Z",
"modified": "2023-08-16T20:58:27.157423Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2578,
"topic": "gcn.circular",
"uuid": "e5a903f7-cbbb-4bf0-b3ae-1978c3e3f755",
"title": "LIGO/Virgo/KAGRA S230814ah: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "Charlie Hoy at University of Portsmouth <charlie.hoy@port.ac.uk>",
"data": {
"date": "23/08/29 21:57:07 GMT",
"from": "Charlie Hoy at University of Portsmouth <charlie.hoy@port.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34595",
"subject": "LIGO/Virgo/KAGRA S230814ah: Updated Sky localization"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe have conducted further analysis of the LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S230814ah (GCN Circular 34429). Parameter estimation has been performed using Bilby [1] and a new sky\nmap, Bilby.offline0.multiorder.fits, distributed via GCN Notice, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S230814ah\n\nFor the Bilby.offline0.multiorder.fits sky map, the 90% credible region is 25260 deg2. Marginalized over the whole sky, the a\nposteriori luminosity distance estimate is 330 +/- 105 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/userguide/.\n\n\n [1] Ashton et al. ApJS 241, 27 (2019)\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMzQ2MjMyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.cPse_-KQG_N_IJHNcsg8faa0wUhs3w53yFSGJPP0P7c\n\n",
"published": "2023-08-29T21:57:19.980629Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-29T21:57:19.980645Z",
"modified": "2023-08-29T21:57:19.984731Z",
"nonlocalizedevents": [
{
"event_id": "S230814a"
}
],
"targets": []
},
{
"id": 2148,
"topic": "gcn.circular",
"uuid": "6b3a7167-56a4-41a1-9e17-2c05fde692be",
"title": "GRB 230816A: Tautenburg observations",
"submitter": "Hop gcn.circular",
"authors": "Sylvio Klose at TLS Tautenburg <klose@tls-tautenburg.de>",
"data": {
"date": "23/08/16 21:06:26 GMT",
"from": "Sylvio Klose at TLS Tautenburg <klose@tls-tautenburg.de>",
"title": "GCN CIRCULAR",
"number": "34459",
"subject": "GRB 230816A: Tautenburg observations"
},
"message_text": "\nS. Klose, S. Melnikov, B. Stecklum, A. Nicuesa Guelbenzu, F. Ludwig (all TLS Tautenburg) report:\n\nWe observed the field of GRB 230816A (Siegel et al., GCN 34450) 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 Jiang et al. (GCN 34453) we measure the following preliminary magnitudes:\n\nr = 21.75 +/- 0.25 (midtime: August 16, 2023, 20:23:11 UT),\n\ni = 20.33 +/- 0.08 (midtime: August 16, 2023, 20:34:05 UT),\n\ncalibrated against USNO stars in the field. The photometry will still be improved by calibrating the data via a nearby Pan-STARRS field.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMjE5OTkxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.qeZM5Xksujypsi9z_GOY3HNKh26HuksnFSgwec7zTfA\n\n",
"published": "2023-08-16T21:06:39.445491Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-16T21:06:39.445510Z",
"modified": "2023-08-16T21:06:39.449589Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2149,
"topic": "gcn.circular",
"uuid": "3d36b98c-5410-4c80-9399-418b46615efe",
"title": "GRB230816A: Possible host and GIT detection of optical counterpart",
"submitter": "Hop gcn.circular",
"authors": "Vishwajeet Swain at IIT Bombay <vishwajeet.s@iitb.ac.in>",
"data": {
"date": "23/08/16 22:08:37 GMT",
"from": "Vishwajeet Swain at IIT Bombay <vishwajeet.s@iitb.ac.in>",
"title": "GCN CIRCULAR",
"number": "34460",
"subject": "GRB230816A: Possible host and GIT detection of optical counterpart"
},
"message_text": "R. Kumar (IITB), R. Sharma (IITB), V. Swain (IITB), A. Salgundi (IITB), H. Kumar (IITB), G. Waratkar(IITB), V. Bhalerao (IITB), G. C. Anupama(IIA), S. Barway (IIA) and K. Angail (IAO) report on behalf of the GIT team:\n\nWe observed the field of GRB 230816A detected by SWIFT (Siegel et al., GCN 34450) with 0.7m GROWTH-India Telescope (GIT). We started observations at 16:40:00 UT, i.e., 31.2 mins after the Swift/BAT trigger. We obtained 5 frames in the r' band of 300 sec each. After image subtraction, we detected a source in our stacked image at RA 21:53:46.96, Dec: +37:51:16.08 with an uncertainty of 0.67 arcsec - coincident with the reported afterglow (Jiang et al., GCN 34453), and 3.75 arsec away from center of the XRT error circle (Siegel et al., GCN 34450).\n\nWe note that there is a faint source (m_r ~ 23.0) nearly coincident with the counterpart in the Pan-STARRS1 images, which could be a host of this GRB. Our image subtraction ensures that this source flux does not affect out photometric measurements. There is no minor planet present at this position. The photometric results are as follows:\n\n----------------------------------------------------------------------\n\n JD (mid) | T_mid-T0 (mins) | Exposure (sec) | Filter | Magnitude (AB) |\n\n----------------------------------------------------------------------\n\n 2460173.202193 | 42.35 | 5 x 300 | r' | 20.61 +/- 0.06 |\n\n----------------------------------------------------------------------\n\nOur results are consistent with other reports (Jiang et al. GCN 34453, Moskvitin et al., GCN 34456, Pankov et al., GCN 34457, Odeh et al., GCN 34458, Klose et al., GCN 34459). We encourage photometric for further confirmation and spectroscopic follow-up for redshift measurement. The magnitudes are calibrated against PanSTARRS DR1 (Chambers et al., 2016) and are not corrected for Galactic extinction.\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMjIzNzIzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.LVyRC-ptq_oC0tenPGrimmqFFtmR0zWj4WoHaxrRb0U\n\n",
"published": "2023-08-16T22:08:48.873493Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-16T22:08:48.873512Z",
"modified": "2023-08-16T22:08:48.877507Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2150,
"topic": "gcn.circular",
"uuid": "ee849123-d00f-4e27-a27d-872917743b41",
"title": "GRB 230812B: SAO RAS optical observations",
"submitter": "Hop gcn.circular",
"authors": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"data": {
"date": "23/08/16 22:32:47 GMT",
"from": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"title": "GCN CIRCULAR",
"number": "34461",
"subject": "GRB 230812B: SAO RAS optical observations"
},
"message_text": "A. S. Moskvitin and O. I. Spiridonova (SAO RAS),\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\n8 x 300 sec. images in Rc band on 19:46:41--20:32:24 UT (August 17).\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, GCN 34442) is clearly detected in our stacked\nframe with the brightness of R = 21.46 +/- 0.06 (t_mid - t0 = 4.0496d).\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMjI1MTczLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.fqER6MlxswDurBsfjOc673Jz70nxR_h4xS1K85WmdN8\n\n",
"published": "2023-08-16T22:32:58.731217Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-16T22:32:58.731235Z",
"modified": "2023-08-16T22:32:58.737988Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2579,
"topic": "gcn.circular",
"uuid": "925b9f1f-e182-4e06-9718-34bd6a5702da",
"title": "GRB 230827B: Swift ToO observations",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/08/29 22:31:52 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34596",
"subject": "GRB 230827B: Swift ToO observations"
},
"message_text": "P. A. Evans (U. Leicester) reports on behalf of the Swift team:\n\nSwift has initiated a ToO observation of the Fermi/GBM GRB 230827B.\nAutomated analysis of the XRT data will be presented online at\nhttps://www.swift.ac.uk/ToO_GRBs/00021620\n\nAny uncatalogued X-ray sources detected in this analysis will be\nreported on this website and via GCN COUNTERPART notices. These are\nnot necessarily related to the Fermi/GBM event. Any X-ray source\nconsidered to be a probable afterglow candidate will be reported via a\nGCN Circular after manual consideration.\n\nDetails of the XRT automated analysis methods are detailed in Evans et\nal. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMzQ4MzE3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.NyhKM6PRi1EpSWccqOLB87nGTLv7nWg-w8v_8PTBXak\n\n",
"published": "2023-08-29T22:32:03.233661Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-29T22:32:03.233689Z",
"modified": "2023-08-29T22:32:03.245246Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2160,
"topic": "gcn.circular",
"uuid": "0c7c3e29-2113-4a32-8e9c-18a437700763",
"title": "GRB 230812B: optical photometry from Konkoly",
"submitter": "Hop gcn.circular",
"authors": "Jozsef Vinko at Konkoly Observator <vinko@konkoly.hu>",
"data": {
"date": "23/08/17 10:23:01 GMT",
"from": "Jozsef Vinko at Konkoly Observator <vinko@konkoly.hu>",
"title": "GCN CIRCULAR",
"number": "34463",
"subject": "GRB 230812B: optical photometry from Konkoly"
},
"message_text": "J. Vinko, L. Kriskovics, A. Pal, R. Szakats\n(Konkoly Observatory, Hungary).\n\nWe report detection and photometry of the optical afterglow of GRB230812B (Fermi GBM Team, GCN 34386;\nScotton et al., GCN 34392; Page et al. GCN 34394; Kuin et al.,GCN 34399; Casentini et al., GCN 34402)\nwith the RC80 robotic telescope at Piszkesteto Station of Konkoly\nObservatory taken on 2023-08-13 to 2023-08-15. A series of 300 sec\nframes were collected through Sloan r'- and i' bands. The optical afterglow\n(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, GCN 34442, GCN 34461)\nwas detected on the stacked frames with the following magnitudes, calibrated\nvia nearby PS1 stars:\n\nDate UT-middle t-T0(hr) Exp(s) r'(AB-mag) i'(AB-mag)\n2023-08-13 19:41:01 24.71 1500 20.47 (0.10) 19.75 (0.12)\n2023-08-14 19:40:32 48.71 1500 21.33 (0.20) 20.51 (0.19)\n2023-08-15 21:50:01 74.86 900 >21.89 >21.45\n\nThe magnitudes above are not corrected for galactic extinction.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMjY3Nzg2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.ge6_KbT8M8DIw3Xa63p0dlvLmX_wldtx0cYx6iima30\n\n",
"published": "2023-08-17T10:23:19.812351Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-17T10:23:19.812371Z",
"modified": "2023-08-17T10:23:19.817864Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2161,
"topic": "gcn.circular",
"uuid": "910f58ff-6b88-430b-9cfe-80c6d1832f82",
"title": "GRB 230817A: 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": "23/08/17 12:12:24 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34464",
"subject": "GRB 230817A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 12:02:56 UT on 17 Aug 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230817A (trigger 713966581.55559 / 230817502).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 325.9, Dec = 14.2 (J2000 degrees, equivalent to J2000 21h 43m, 14d 11'), with a statistical uncertainty of 3.3 degrees.\n\nThe angle from the Fermi LAT boresight is 93.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230817502/quicklook/glg_skymap_all_bn230817502.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/bn230817502/quicklook/glg_healpix_all_bn230817502.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230817502/quicklook/glg_lc_medres34_bn230817502.gif\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMjc0MzUwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.IzNsqk2fO3cIQgoQdGJaARdp_72ibSbwqK2mrPJolac\n\n",
"published": "2023-08-17T12:12:38.764188Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-17T12:12:38.764211Z",
"modified": "2023-08-17T12:12:38.769009Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2580,
"topic": "gcn.circular",
"uuid": "6571a79e-3a9f-488a-b66a-2ba20b1ab39b",
"title": "GRB 230812B: Spectroscopic detection of the associated SN 2023pel.",
"submitter": "Hop gcn.circular",
"authors": "J. F. Agui Fernandez at IAA-CSIC <feli@iaa.es>",
"data": {
"date": "23/08/29 22:49:42 GMT",
"from": "J. F. Agui Fernandez at IAA-CSIC <feli@iaa.es>",
"title": "GCN CIRCULAR",
"number": "34597",
"subject": "GRB 230812B: Spectroscopic detection of the associated SN 2023pel."
},
"message_text": "J. F. Agui Fernandez (IAA-CSIC), A. de Ugarte Postigo (OCA-CNRS), C. C. Thoene (ASU-CAS), D. B. Malesani (Radboud and DAWN/NBI), L. Izzo (INAF-OACN and DARK/NBI) and A. L. Cabrera Lavers (GTC, IAC) report:\n\nWe observed the long GRB 230812B*/*SN 2023pel (Fermi GBM Team GCN, 34386; Roberts et al. GCN34391, Scotton et al. GCN 34392, Zheng & Filippenko GCN 34395, Beardmore et al. GCN 34400) on August 24, 2023 at 21.79 hours UT, ~12.12 days after the GRB detection, with OSIRIS+ in spectroscopy mode at the 10.4m GTC Telescope located at Roque de los Muchachos, Canary Islands, Spain. The spectrum covers the wavelength range from 3700 to 7500 AA. In a preliminary analysis, the spectrum shows the characteristic undulations of a GRB-SN spectrum. Our spectrum is well matched to the spectrum of SN 1998bw at a comparable rest-frame epoch (Patat et al. 2001, ApJ, 555, 900). We can thus conclusive determine the presence of a SN associated with GRB 230812B, confirming previous claims based on photometric evidence (Moskvitin & Spiridonova GCN 34475, Moskvitin & Goranskij GCN 34496, Kumar et al. GCN 34500, Turpin et al. GCN 34508, Kumar et al. GCN 34516, Pankov et al. GCN 34519).\n\nWe acknowledge excellent support from the GTC staff.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMzQ5Mzg4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.a7NCrFQb49gMZoj3XSOgUvuoZir12BGnfC_HsIYWNdQ\n\n",
"published": "2023-08-29T22:49:53.395104Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-29T22:49:53.395126Z",
"modified": "2023-08-29T22:49:53.398876Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2162,
"topic": "gcn.circular",
"uuid": "8ec70ad1-4f13-4809-a84e-d135ee7b0b07",
"title": "GRB 230817A: BALROG localization (Fermi Trigger 713966581 / GRB 230817502)",
"submitter": "Hop gcn.circular",
"authors": "Jochen Greiner at MPE <jcgrog@mpe.mpg.de>",
"data": {
"date": "23/08/17 12:41:57 GMT",
"from": "Jochen Greiner at MPE <jcgrog@mpe.mpg.de>",
"title": "GCN CIRCULAR",
"number": "34465",
"subject": "GRB 230817A: BALROG localization (Fermi Trigger 713966581 / GRB 230817502)"
},
"message_text": "T. Preis, B. Biltzinger, J. Burgess & J. Greiner (all MPE Garching) report:\n\nThe public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger\n713966581 at 12:02:56 on 17 Aug. 2023 were automatically fitted for spectrum\nand sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427;\nBerlato et al. 2019, ApJ 873, 60).\n\nThe best-fit position (1 sigma statistical errors) is:\nRA(2000.0) = 324.8+/-1.0 deg\nDecl.(2000.0) = 17.0+/-0.9 deg\nWe estimate an additional systematic error of 1 deg.\n\nFurther details are available at:\nhttps://grb.mpe.mpg.de/grb/GRB230817502/\n\nThe Healpix map can be downloaded from:\nhttps://grb.mpe.mpg.de/grb/GRB230817502/healpix\n\nThe location parameters are available as JSON at:\nhttps://grb.mpe.mpg.de/grb/GRB230817502/json\n\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMjc2MTIzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.leJRRLx9_iRJ8D6nDTzzMChiJlpmxwTAt8LKT7DO2ec\n\n",
"published": "2023-08-17T12:42:11.265825Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-17T12:42:11.265842Z",
"modified": "2023-08-17T12:42:11.270929Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2165,
"topic": "gcn.circular",
"uuid": "5bc4eca5-8574-4793-a503-bc88b9ee37da",
"title": "Fermi GRB 230817A: 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": "23/08/17 14:30:32 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34466",
"subject": "Fermi GRB 230817A: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB 230817A ( Fermi GBM team, GCN 34464) errorbox 5213 sec after notice time and 5246 sec after trigger time at 2023-08-17 13:30:22 UT, with upper limit up to 15.9 mag. Observations started at twilight. The observations began at zenith distance = 59 deg. The sun altitude is -9.7 deg.\n\nThe galactic latitude b = -29 deg., longitude l = 70 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"55349\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 5254 | 2023-08-17 13:30:22 | MASTER-Tunka | (21h 48m 35.92s , +12d 10m 22.3s) | C | 15 | 15.9 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMjgyNjM4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.wbGE2GUppF1zooX91g5W_HtRx49gD9a_gEYW8ywzMIU\n\n",
"published": "2023-08-17T14:30:43.998697Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-17T14:30:43.998716Z",
"modified": "2023-08-17T14:30:44.002935Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2168,
"topic": "gcn.circular",
"uuid": "b5b5cde1-47b8-4692-8acd-754631ccf3b5",
"title": "GRB 230815A: VLT/HAWK-I near-infrared afterglow detection",
"submitter": "Hop gcn.circular",
"authors": "Benjamin Schneider at MIT <bschn@mit.edu>",
"data": {
"date": "23/08/17 16:41:24 GMT",
"from": "Benjamin Schneider at MIT <bschn@mit.edu>",
"title": "GCN CIRCULAR",
"number": "34467",
"subject": "GRB 230815A: VLT/HAWK-I near-infrared afterglow detection"
},
"message_text": "B. Schneider (MIT), A. Chrimes (Radboud), D. B. Malesani (Radboud and DAWN/NBI),\nA. J. Levan (Radboud), N. R. Tanvir (U. Leicester), A. de Ugarte Postigo (OCA/CNRS),\nreport on behalf of the Stargate collaboration:\n\nWe observed the field of GRB 230815A (Klingler et al., GCN 34434;\nMailyan et al. GCN 34440) with the ESO Very Large Telescope, equipped\nwith the HAWK-I near-infrared camera. Observations consisted of two\nepochs of 20 min exposure in the H band at 23:19:53 UT on 2023-08-15\n(~12.5 hr after trigger) and 23:15:46 UT on 2023-08-16 (~36.4 hr after\ntrigger).\n\nIn both epochs, we clearly detected two sources consistent with the XRT\nerror circle (Beardmore et al., GCN 34437). One of the sources has\nsignificantly faded (~2 mag) between the two epochs, evolving from\nAB mag = 20.11 +/- 0.02 to AB mag = 22.01 +/- 0.08. This corresponds\nto a power-law decay index of 1.65, similar to the X-ray decay rate,\nsuggesting a small host contribution to the NIR flux. The proposed\nafterglow of the burst is detected at coordinates:\n\nRA (J2000) = 12:18:53.24\nDEC (J2000) = -58:03:09.45\n\nwith an uncertainty of 0.3\".\n\nWe acknowledge the excellent support provided by the Paranal staff,\nin particular Joe Anderson.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMjkwNDkwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.3QSnwZtM4FQONf-hKUmfotRjEbotqmmXlgWwixGA4Nk\n\n",
"published": "2023-08-17T16:41:40.125960Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-17T16:41:40.125979Z",
"modified": "2023-08-17T16:41:40.129941Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2169,
"topic": "gcn.circular",
"uuid": "30a00580-91c3-408c-94e1-fe8324ef18b7",
"title": "GRB 230812B: NOEMA detection",
"submitter": "Hop gcn.circular",
"authors": "Antonio de Ugarte Postigo at OCA <deugarte@oca.eu>",
"data": {
"date": "23/08/17 18:26:36 GMT",
"from": "Antonio de Ugarte Postigo at OCA <deugarte@oca.eu>",
"title": "GCN CIRCULAR",
"number": "34468",
"subject": "GRB 230812B: NOEMA detection"
},
"message_text": "A. de Ugarte Postigo, (OCA-CNRS), J. M. Winters (IRAM), C. C. Thoene (ASU-CAS), S. Antier (OCA), J. F. Agui-Fernandez (IAA-CSIC), M. Bremer (IRAM), D. A. Perley (LJMU), S. Martin (ESO, ALMA) report,\n\nWe observed the afterglow of GRB 230812B (Roberts et al. GCN34391, Scotton et al. GCN 34392, Zheng & Filippenko GCN 34395, Beardmore et al. GCN 34400) with NOEMA in the 3mm band. The observation started on August 16 at 13:49 UT (3.79 days after the burst) and included observations at 75 and 89.5 GHz side bands.\n\nThe afterglow, previously detected in radio by AMI-LA (Rhodes et al. GCN34433) is weakly detected at 75 GHz with a flux density of 0.14 mJy. At a redshift of z = 0.36 (de Ugarte Postigo et al. GCN 34409) the afterglow currently has a luminosity of <10^30 erg/s/Hz which is amongst the least luminous afterglows detected at these frequencies.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMjk2ODAxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.EkZzzcACDXNDvTQ3K33e5RROii8lMj7jEzgULzZhy1o\n\n",
"published": "2023-08-17T18:26:51.384554Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-17T18:26:51.384573Z",
"modified": "2023-08-17T18:26:51.389847Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2170,
"topic": "gcn.circular",
"uuid": "f02715d6-6a64-4e0d-9d72-c884d2055068",
"title": "GRB 230816A: Osservatorio Astronomico \"Nastro Verde\" optical observations",
"submitter": "Hop gcn.circular",
"authors": "Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy - MPC Code C82 <osservatorionastroverde@gmail.com>",
"data": {
"date": "23/08/17 19:51:04 GMT",
"from": "Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy - MPC Code C82 <osservatorionastroverde@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34469",
"subject": "GRB 230816A: Osservatorio Astronomico \"Nastro Verde\" optical observations"
},
"message_text": "Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy\nin a large collaboration with:\nM.G. Dainotti (National Astronomical Observatory of Japan), \nY. Niino (Tokyo University, Institute of Astronomy), \nK. Kalinowski (Aarhus University, Department of Physics and Astronomy),\nB. De Simone (Universita' degli Studi Di Salerno)\nreport: \n\nWe observed the field of GRB 230816A (Siegel et al., GCN 34450) with telescope of Nastro Verde Observatory - Sorrento (Naples), Italy.\nMember of: \nAAVSO - American Association of Variable Star Observers.\nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili.\nAstroCampania Associazione\n\nThe observations started at 18:55 UT of 2023/08/16, after about 2,45 hours after the GRB trigger, at the end of twilight with clear skies, with principal telescope SC 0.35 f/10 with focal reduced + CCD Sbig ST10 XME\nI took 25 image of 240 sec each. All images are unfiltered, calibrated with masterdark and masterflat,stacked with Tycho Tracker software\nWe have detected a faint source of magnitude 19.1 G at the enhanced position reported by Swift-XRT (Siegel et al., GCN 34450, P.A. Evans et al., GCN 34462) and by optical telescopes ( A. S. Moskvitin et al GCN 34456., N. Pankov et al GCN 34457., Mohammad Odeh et al GCN 34458., S. Klose et al GCN 34459., R. Kumar et al GCN 34460)\nat following position\n\nRA (J2000.0) 21h 53m 46.87s \nDecl. (J2000.0) +37° 51' 14.7\" \n\nPhotometry and astrometry on stack of 13 images each of 240 sec\n\nGRB 230816A KC2023 08 16.88481 21 53 46.87 +37 51 14.7 19.1 G C82 \n \n\n\n\nMagnitudes were estimated with the GAIA DR2 cat. and \nare not corrected for galactic dust extinction.\n\n\n\nThe message may be cited.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMzAxODY5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.jRR6uhfTIod15suA5QvnWOD97GJK5FQIOQ1_7ALch1Y\n\n",
"published": "2023-08-17T19:51:14.618302Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-17T19:51:14.618320Z",
"modified": "2023-08-17T19:51:14.622257Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 3733,
"topic": "gcn.circular",
"uuid": "4ddcc426-f3a2-4a0a-bc6e-36958f05666a",
"title": "LIGO/Virgo/KAGRA S231008ap: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Annalisa Allocca at Università di Napoli Federico II <annalisa.allocca@na.infn.it>",
"data": {
"date": "23/10/08 15:17:19 GMT",
"from": "Annalisa Allocca at Università di Napoli Federico II <annalisa.allocca@na.infn.it>",
"urls": {
"gcn": "https://gcn.nasa.gov/circulars/34807"
},
"title": "GCN CIRCULAR",
"number": "34807",
"subject": "LIGO/Virgo/KAGRA S231008ap: 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 S231008ap during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-10-08 14:25:21.816 UTC (GPS\ntime: 1380810339.816). The candidate was found by the CWB [1], GstLAL\n[2], MBTA [3], PyCBC Live [4], and SPIIR [5] analysis pipelines.\n\nS231008ap is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 1.5e-09 Hz, or about one in 20\nyears. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S231008ap\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS\n(<1%).\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is <1%. [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 36 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\n3290 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 3356 +/- 1119 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. PRD 108, 043004 (2023) and Ewing et al. arXiv: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\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/34807.",
"published": "2023-10-08T15:17:37.468507Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-10-08T15:17:37.468527Z",
"modified": "2023-10-08T15:17:37.474764Z",
"nonlocalizedevents": [
{
"event_id": "S231008a"
}
],
"targets": []
},
{
"id": 2172,
"topic": "gcn.circular",
"uuid": "069179a2-1f9a-4130-abc9-4f465dcfcec4",
"title": "GRB 230816A: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/08/17 21:21:12 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34470",
"subject": "GRB 230816A: Swift-XRT refined Analysis"
},
"message_text": "M.G. Bernardini (INAF-OAB), J. D. Gropp (PSU), S. Dichiara (PSU), J.A.\nKennea (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester),\nE. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA) and P.A. Evans\nreport on behalf of the Swift-XRT team:\n\nWe have analysed 3.9 ks of XRT data for GRB 230816A, from 97 s to 91.3\nks after the BAT trigger. The data are entirely in Photon Counting\n(PC) mode.\n\nThe light curve can be modelled with a power-law decay with a decay\nindex of alpha=1.44 (+0.27, -0.43).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 1.66 (+0.31, -0.14). The\nbest-fitting absorption column is consistent with the Galactic value\nof 2.9 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed\n(unabsorbed) 0.3-10 keV flux conversion factor deduced from this\nspectrum is 4.4 x 10^-11 (5.6 x 10^-11) erg cm^-2 count^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 2.9 (+/-1.2) x 10^21 cm^-2\nGalactic foreground: 2.9 x 10^21 cm^-2\nExcess significance: <1.6 sigma\nPhoton index:\t 1.66 (+0.31, -0.14)\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/01185673.\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMzA3Mjc4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.D7SbjduPkTMDssMZwFXqKfvXdm7Pee2zUp4lraLkrAg\n\n",
"published": "2023-08-17T21:21:23.693914Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-17T21:21:23.693933Z",
"modified": "2023-08-17T21:21:23.697797Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2178,
"topic": "gcn.circular",
"uuid": "176786a6-7beb-4355-9a90-e2aeeb2ceb1c",
"title": "GRB 230812B: SAO RAS optical observations",
"submitter": "Hop gcn.circular",
"authors": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"data": {
"date": "23/08/17 23:46:52 GMT",
"from": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"title": "GCN CIRCULAR",
"number": "34471",
"subject": "GRB 230812B: SAO RAS optical observations"
},
"message_text": "A. S. Moskvitin and O. I. Spiridonova (SAO RAS),\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\n12 x 300 sec. images in Rc band on 21:14:58--22:26:52 UT (August 17).\nIn the previous GCN 34461 we have a typo in date, the correct date is\nAugust 16. We apologize for the possible confusion and inconvenience.\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; Vinko et al., GCN 34463)\nis clearly detected in our stacked frame with the brightness of\nR = 21.79 +/- 0.09 (t_mid - t0 = 5.1199 days).\n\nThis preliminary photometry is based on the nearby SDSS stars;\nmagnitudes are converted using Lupton (2005) equations.\n\nWe are grateful to the SAO RAS staff for their technical support.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMzE2MDE3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.f0kLkgjLfjQKt9DhyoXQJ_L49eDAK3P1e1FVfsFi8wc\n\n",
"published": "2023-08-17T23:47:03.107563Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-17T23:47:03.107581Z",
"modified": "2023-08-17T23:47:03.112970Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2582,
"topic": "gcn.circular",
"uuid": "eea9dd72-1c8e-4359-94e6-288256cd89f4",
"title": "LIGO/Virgo/KAGRA S230820bq: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "Anjali Balasaheb Yelikar at Rochester Institute of Technology <ay2016@g.rit.edu>",
"data": {
"date": "23/08/29 23:14:39 GMT",
"from": "Anjali Balasaheb Yelikar at Rochester Institute of Technology <ay2016@g.rit.edu>",
"title": "GCN CIRCULAR",
"number": "34598",
"subject": "LIGO/Virgo/KAGRA S230820bq: 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 S230820bq (GCN Circular 34504). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.offline0.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S230820bq\n\nFor the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible region is 1373 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 3600 +/- 1437 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMzUwODg0LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.RrO-OnLNOFXfhaW425gG9O3YXt3I-SXgiNhRdGDY25U\n\n",
"published": "2023-08-29T23:14:49.766693Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-29T23:14:49.766710Z",
"modified": "2023-08-29T23:14:49.770565Z",
"nonlocalizedevents": [
{
"event_id": "S230820b"
}
],
"targets": []
},
{
"id": 2181,
"topic": "gcn.circular",
"uuid": "490f0d81-31f4-4e3a-8728-a3d5115aa821",
"title": "GRB 230817A: AstroSat CZTI detection",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "23/08/18 05:55:19 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"title": "GCN CIRCULAR",
"number": "34472",
"subject": "GRB 230817A: AstroSat CZTI detection"
},
"message_text": "P. K. Navaneeth (IUCAA), B. Pari (IITB), 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 230817A which was also detected by Fermi (Fermi GBM Team, GCN Circ. 34464).\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 2023-08-17 12:03:31.50 UTC. The measured peak count rate associated with the burst is 470 (+48, -40) counts/s above the background in the combined data of all quadrants, with a total of 7321 (+420, -529) counts. The local mean background count rate was 418 (+2, -2) counts/s. Using cumulative rates, we measure a T90 of 48 (+6, -7) s. In the preliminary analysis, we find 537 Compton events associated with this event.\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 2023-08-17 12:03:31.31 UTC. The measured peak count rate associated with the burst is 361 (+80, -24) counts/s above the background in the combined data of all quadrants, with a total of 4084 (+1006, -1452) counts. The local mean background count rate was 1322 (+5, -4) counts/s. We measure a T90 of 33 (+9, -5) 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMzM4MTI1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.VL0IHoR9fb7eNI2IfjLUOVhJdrPmBbV7X0oF1i1uRUM\n\n",
"published": "2023-08-18T05:55:34.147473Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-18T05:55:34.147490Z",
"modified": "2023-08-18T05:55:34.153622Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2188,
"topic": "gcn.circular",
"uuid": "fa7423f4-3cef-4fff-9b96-2f76339fca2a",
"title": "GRB 230816A: SVOM/C-GFT optical detection",
"submitter": "Hop gcn.circular",
"authors": "Chao Wu at NAOC <wuchao.lamost@gmail.com>",
"data": {
"date": "23/08/18 13:41:54 GMT",
"from": "Chao Wu at NAOC <wuchao.lamost@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34473",
"subject": "GRB 230816A: SVOM/C-GFT optical detection"
},
"message_text": "Liping Xin (NAOC), Chao Wu (NAOC), Zhe Kang (CHO), Xuhui Han (NAOC), Huali\nLi (NAOC), Xiaomeng Lu (NAOC), Damien Turpin(CEA), Zhenwei Li\n(CHO)ï¼Pinpin Zhang (NAOC)ï¼Ruosong Zhang (NAOC)ï¼Yulei Qiu (NAOC)ï¼You Lv\n(CHO)ï¼Jing Wang(GXU), Cordier Bertrand (CEA) and Jianyan Wei (NAOC) on\nbehalf of SVOM GRB team\n\nWe observed the burst GRB230816A (Siegel et al. GCN Circ. 34450) on\n16:15:38 UT, Aug. 16th, 2023, about 6.9 minutes after the Swift trigger\nwith C-GFT (Chinese Ground Follow-up Telescope in SVOM mission) in System\nTest Mode (STM). C-GFT is located at Jilin (long.=126.33 deg,\nlat.=43.8243778 deg), Changchun Observatory, National Astronomical\nObservatories, CAS. It has FOV of 1.5 deg X 1.5 deg with a 4k*4k CMOS\ndetector mounted on the primary focus of 1.2-meter-aperure telescope.\n\nA series of g and r band images were obtained. The exposure time was 10\nseconds for each frame.\n\nThe optical afterglow reported (Jiang et al., GCN 34453, Moskvitin et al.,\nGCN 34456., Pankov et al.,GCN 34457, Odeh et al., GCN 34458Klose et al.,\nGCN 34459., Kumar et al., GCN 34460; Ruocco et al., GCN 34469) was also\nclearly detected by our stacked r-band image (100 * 10 seconds). The\nbrightness was estimated to be about 20.1 +/-0.2 magnitude in r-band with\nthe midtime of about 34 min after the burst, after calibration with nearby\n USNO R2 catalogs.\n\nMore detailed analysis is continuing.\n\nWe thank the observation assistant Bowen Li at Jilin observatory for their\nexcellent support.\n\nThis message may be cited.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMzY2MTE5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.atLp4CIepLOEmfSxkpzi_6o7TIZxWHQ7ObYt4TKpGiM\n\n",
"published": "2023-08-18T13:42:05.069850Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-18T13:42:05.069870Z",
"modified": "2023-08-18T13:42:05.075026Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2195,
"topic": "gcn.circular",
"uuid": "d8d343bb-483a-4479-b61c-3413d222b26d",
"title": "GRB 230816A: Swift-BAT refined analysis",
"submitter": "Hop gcn.circular",
"authors": "Tyler Parsotan at NASA GSFC <tyler.parsotan@nasa.gov>",
"data": {
"date": "23/08/18 18:04:02 GMT",
"from": "Tyler Parsotan at NASA GSFC <tyler.parsotan@nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34474",
"subject": "GRB 230816A: Swift-BAT refined analysis"
},
"message_text": "A. Y. Lien (U Tampa), S. D. Barthelmy (GSFC),\nH. A. Krimm (NSF), S. Laha (GSFC/UMBC),\nC. B. Markwardt (GSFC), D. M. Palmer (LANL),\nT. Parsotan (GSFC/UMBC), T. Sakamoto (AGU),\nM. Stamatikos (OSU) (i.e. the Swift-BAT team):\n\n\nUsing the data set from T-239 to T+303 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 230816A (trigger #1185673)\n(Siegel, et al., GCN Circ. 34450). The BAT ground-calculated position is\nRA, Dec = 328.453, 37.853 deg which is\nRA(J2000) = 21h 53m 48.8s\nDec(J2000) = +37d 51' 12.1\"\nwith an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 98%.\n\n\nThe mask weighted light curve shows a fast rise exponential decay type single peak.\nT90 (15-350 keV) is 20.48 +- 4.94 sec (estimated error including systematics).\n\n\nThe time-averaged spectrum from T-5.60 to T+21.08 sec is best fit by a simple\npower-law model. The power law index of the time-averaged spectrum is\n1.43 +- 0.14. The fluence in the 15-150 keV band is 7.7 +- 0.7 x 10^-07 erg/cm2.\nThe 1-sec peak photon flux measured from T+0.60 sec in the 15-150 keV band\nis 1.0 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence\nlevel.\n\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/1185673/BA/ <http://gcn.gsfc.nasa.gov/notices_s/1185673/BA/>\n\n\n\n\n\n\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMzgxODQ4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Wnc56Dx5Rtqemxb-QHpWzVmSHKlsP39h1aNCZkfCo7g\n\n",
"published": "2023-08-18T18:04:19.057716Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-18T18:04:19.057736Z",
"modified": "2023-08-18T18:04:19.063957Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2200,
"topic": "gcn.circular",
"uuid": "949fe110-1561-434e-be41-1db2f6171f8c",
"title": "GRB 230812B: SAO RAS observations, possible re-brightening",
"submitter": "Hop gcn.circular",
"authors": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"data": {
"date": "23/08/18 22:28:55 GMT",
"from": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"title": "GCN CIRCULAR",
"number": "34475",
"subject": "GRB 230812B: SAO RAS observations, possible re-brightening"
},
"message_text": "A. S. Moskvitin and O. I. Spiridonova (SAO RAS),\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\n12 x 300 sec. images in Rc band on 20:13:25--21:49:22 UT (August 18).\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; Vinko et al.,\nGCN 34463) is clearly detected in our stacked frame with\nthe brightness of R = 21.46 +/- 0.06 (t_mid - t0 = 6.0856 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMzk3NzQxLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.3o-XX7ljpo5qVvhf3ACN70gZvJD0QqXxCyHhU-dnqu0\n\n",
"published": "2023-08-18T22:29:07.092198Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-18T22:29:07.092215Z",
"modified": "2023-08-18T22:29:07.096312Z",
"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": [],
"targets": []
},
{
"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",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 7143,
"topic": "gcn.circular",
"uuid": "4c75eb37-16f5-468e-90ff-7ab563bd68ea",
"title": "LIGO/Virgo/KAGRA S240422ed: GECKO/KMTNet Transient Candidates",
"submitter": "Hop gcn.circular",
"authors": "Gregory Paek at Seoul National University <gregorypaek94@gmail.com>",
"data": {
"date": "24/05/02 13:08:10 GMT",
"from": "Gregory Paek at Seoul National University <gregorypaek94@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36371"
},
"title": "GCN CIRCULAR",
"number": "36371",
"subject": "LIGO/Virgo/KAGRA S240422ed: GECKO/KMTNet Transient Candidates"
},
"message_text": "Gregory S.H. Paek, Myungshin Im, Mankeun Jeong, Seo-Won Chang, Seong-Kook Lee (SNU/SNU ARC), Dong-Jin Kim and Chung-Uk Lee (KASI), on behalf of the GECKO team\n\nWe report transient candidates identified by the GECKO team using the three Korea Microlensing Telescope Network (KMTNet) 1.6-m telescopes (GCN 36343) in response to the LIGO/Virgo/KAGRA S240422ed trigger (GCN 36236).\n\nReference images for the observed fields were partially obtained from the KMTNet Synoptic Survey of the Southern Sky (KS4) project, and photometry was performed on subtracted images using HOTPANTS (Becker et al. 2015). Here are 10 transient candidates:\n\nNAME RA DEC FILTER DATE-OBS t-t0 MAG MAGERR COMMENT\nGECKO24a 122.320 -29.659 R 2024-04-23T09:50:58 0.51 20.54 0.08\nGECKO24a 122.320 -29.659 R 2024-04-24T08:59:57 1.48 20.90 0.08\nGECKO24b 129.629 -32.944 R 2024-04-23T12:35:42 0.63 16.50 0.00\nGECKO24b 129.629 -32.944 R 2024-04-24T02:03:10 1.19 16.41 0.00\nGECKO24b 129.629 -32.944 R 2024-04-24T18:46:05 1.88 16.57 0.00\nGECKO24b 129.629 -32.944 R 2024-04-25T19:12:42 2.90 16.52 0.00\nGECKO24c 130.456 -30.977 R 2024-04-24T18:46:05 1.88 19.44 0.04\nGECKO24d 130.468 -31.666 R 2024-04-24T18:46:05 1.88 19.84 0.06\nGECKO24e 124.768 -37.096 R 2024-04-23T12:23:27 0.62 18.78 0.05\nGECKO24e 124.768 -37.096 R 2024-04-24T18:32:02 1.87 18.31 0.02\nGECKO24f 127.124 -33.490 R 2024-04-23T18:54:32 0.89 18.69 0.02\nGECKO24f 127.124 -33.490 R 2024-04-24T20:41:09 1.96 18.45 0.02\nGECKO24g 121.753 -30.285 I 2024-04-26T18:18:43 3.86 18.81 0.02\nGECKO24h 127.557 -34.603 R 2024-04-23T18:54:32 0.89 19.92 0.11\nGECKO24h 127.557 -34.603 R 2024-04-24T02:03:10 1.19 20.32 0.04\nGECKO24h 127.557 -34.603 R 2024-04-24T20:41:09 1.96 19.64 0.05 *\nGECKO24i 122.275 -29.775 R 2024-04-23T09:50:58 0.51 21.00 0.06 AT 2024hea\nGECKO24i 122.275 -29.775 R 2024-04-24T08:59:57 1.48 20.14 0.07 AT 2024hea\nGECKO24j 123.527 -29.731 R 2024-04-23T09:50:58 0.51 20.90 0.10 AT 2024heb\n\nWe have analyzed forced photometry results from the ATLAS data spanning from 2000 to the present (L. Shingles+21) and compared their light curves with AT2017gfo-like kilonova scaled to the luminosity distance of S240422ed.\n\nGECKO24i and GECKO24j have already been reported in the Transient Name Server (TNS; Gal-Yam et al. 2021) as AT 2024hea and AT 2024heb, respectively. GECKO24c and GECKO24d are suspected to be moving objects, as their movement was observed in individual frames. GECKO24b, GECKO24e, GECKO24f, and GECKO24g have been ruled out as kilonovae candidates due to their brightness and/or decay rates. GECKO24h exhibits a brightness similar to that of an AT2017gfo-like kilonova; however, the activity observed in the historical ATLAS data suggests otherwise. Note that the third epoch in the light curve stands out due to contamination of near galaxy residual induced by imperfect subtraction. All the candidates, except for GECKO24a, are unlikely to be associated with S240422ed. We have not excluded GECKO24a yet, due to comparable brightness and decay rate with AT2017gfo-like kilonova during early epochs. It is also in the vicinity of a galaxy association with ~1.7 arcsec separation.\n\nGravitational-wave EM Counterpart Korean Observatory (GECKO; Im et al. 2023, Proceedings of IAU Symp. Vol. 363, pp. 207.; Paek et al. 2024, The Astrophysical Journal, Vol. 960, Number 2, 113.) is a network of 0.5m to 1m class telescopes worldwide. KMTNet is operated by the Korea Astronomy and Space Science Institute. We thank the KMTNet operators for their support for the KMTNet observations.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36371.",
"published": "2024-05-02T13:08:27.304794Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-05-02T13:08:27.304824Z",
"modified": "2024-05-02T13:08:27.314215Z",
"nonlocalizedevents": [
{
"event_id": "S240422e"
}
],
"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": 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": 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",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-19T03:12:49.447151Z",
"modified": "2023-08-19T03:12:49.451487Z",
"nonlocalizedevents": [],
"targets": []
},
{
"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",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-19T03:42:24.465338Z",
"modified": "2023-08-19T03:42:24.471340Z",
"nonlocalizedevents": [],
"targets": []
},
{
"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",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 3049,
"topic": "gcn.circular",
"uuid": "6a1ac627-7eaf-4349-abff-08f13eb91d9f",
"title": "GRB 230911D: GRBAlpha detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "23/09/16 16:00:54 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"title": "GCN CIRCULAR",
"number": "34712",
"subject": "GRB 230911D: GRBAlpha detection"
},
"message_text": "M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, M. Kolar, J.-P. Breuer, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), yyT. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration.\n\nThe long-duration GRB 230911D (Fermi/GBM detection: GCN 34656; Fermi/LAT detection: GCN 34668; Konus/Wind detection: GCN 34659; NuSTAR detection: GCN 34678; INTEGRAL/SPI-ACS peak detection at 2023-09-11 ~07:53:25 UT) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023; arXiv:2302.10048).\n\nThe detection was confirmed at the peak time 2023-09-11 07:53:26 UTC. The T90 duration measured by GRBAlpha is 45 s and the overall significance during T90 reaches 56 sigma.\n\nThe light curve obtained by GRBAlpha is available here: \nhttps://grbalpha.konkoly.hu/static/share/GRB230911D_GCN.pdf\n\nAll GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/hea/GRBAlpha/ \nGRBAlpha, launched on 2021 March 22, is a demonstration mission for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~50 keV to ~1000 keV. To increase the duty cycle and the downlink rate, the upgrade of the on-board data acquisition software stack is in progress. The ground segment is also supported by the radio amateur community and it takes advantage of the SatNOGS network for increased data downlink volume. \n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/34712.\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjk0ODgwMDYwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.pyFvD3Zt_Y1uOKomAQTzyBKZoiEgCspfQiBpI__grx8\n\n",
"published": "2023-09-16T16:01:11.494832Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-09-16T16:01:11.494852Z",
"modified": "2023-09-16T16:01:11.503096Z",
"nonlocalizedevents": [],
"targets": []
},
{
"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",
"nonlocalizedevents": [],
"targets": []
},
{
"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",
"nonlocalizedevents": [],
"targets": []
},
{
"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",
"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": 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": 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": 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": 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": [],
"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": 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": 6295,
"topic": "gcn.circular",
"uuid": "1662a2fb-163a-451c-b807-bf005c74eed5",
"title": "X-ray transient EP240315a: continued ATCA monitoring",
"submitter": "Hop gcn.circular",
"authors": "Roberto Ricci at INAF-IRA <ricci@ira.inaf.it>",
"data": {
"date": "24/03/29 11:07:44 GMT",
"from": "Roberto Ricci at INAF-IRA <ricci@ira.inaf.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35990"
},
"title": "GCN CIRCULAR",
"number": "35990",
"subject": "X-ray transient EP240315a: continued ATCA monitoring"
},
"message_text": "R. Ricci (INAF-IRA), D. Dobie (Swinburne/OzGrav), J. K. Leung (U. Toronto/HUJI), E. Troja (U. Rome)\n\n\nWe report on the results of a follow-up observation of the field of AT2024eju (Srivastav et al., GCN35932), the likely optical counterpart to the fast X-ray transient EP240315a (Zhang et al., GCN35931), with the Australia Telescope Compact Array (ATCA) under project code CX564. The observations were taken from 2024-03-26 06:20 UT to 2024-03-26 11:24 UT, in a single run, at 5.5 and 9 GHz. The primary calibrator was 1934-638 and the phase calibrator 0941-080. \n\n\nFrom a preliminary analysis, the radio source reported in our previous GCN (Leung et al., GCN 35968) continues to be detected at a comparable flux level, ~0.1 mJy. Monitoring with ATCA will continue to assess the variability of the source. \n\n\nWe thank the CSIRO Space and Astronomy staff, in particular Jamie Stevens, for supporting these observations in a timely manner. We acknowledge the Gomeroi people as the traditional owners of the Observatory site. The Australia Telescope Compact Array is part of the Australia Telescope National Facility (https://ror.org/05qajvd42) which is funded by the Australian Government for operation as a National Facility managed by CSIRO.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35990.",
"published": "2024-03-29T11:08:01.238851Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-03-29T11:08:01.238883Z",
"modified": "2024-03-29T11:08:01.244518Z",
"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",
"published": "2023-08-20T09:46:06.233941Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-20T09:46:06.233960Z",
"modified": "2023-08-20T09:46:06.240267Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2595,
"topic": "gcn.circular",
"uuid": "82eb068b-fa46-4068-a3c2-e7762ccefb76",
"title": "LIGO/Virgo/KAGRA S230830b: Retraction of GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "apratim.ganguly@ligo.org",
"data": {
"date": "23/08/30 05:42:40 GMT",
"from": "apratim.ganguly@ligo.org",
"title": "GCN CIRCULAR",
"number": "34599",
"subject": "LIGO/Virgo/KAGRA S230830b: Retraction of GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nThe trigger S230830b is no longer considered to be a candidate of interest. There were data quality issues and the detection pipeline expert recommended a retraction.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMzc0MTY1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Zp_UyJdYUgBsqf9EMEthk7CuT2vpN70fuHQ5xieN8eg\n\n",
"published": "2023-08-30T05:42:56.947986Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-30T05:42:56.948012Z",
"modified": "2023-08-30T05:42:56.957456Z",
"nonlocalizedevents": [
{
"event_id": "S230830b"
}
],
"targets": []
},
{
"id": 6296,
"topic": "gcn.circular",
"uuid": "530fdab4-d497-4dfb-a80d-236ab64d3351",
"title": "Fermi GRB 240328B: 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": "24/03/29 17:31:00 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35992"
},
"title": "GCN CIRCULAR",
"number": "35992",
"subject": "Fermi GRB 240328B: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\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, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.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-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB 240328B ( Fermi GBM team, GCN 35987) errorbox 77794 sec after notice time and 77830 sec after trigger time at 2024-03-29 16:46:21 UT, with upper limit up to 17.5 mag. The observations began at zenith distance = 77 deg. The sun altitude is -35.1 deg.\n\nThe galactic latitude b = 34 deg., longitude l = 339 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id$09475\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 77860 | 2024-03-29 16:46:21 | MASTER-Tunka | (14h 36m 48.87s , -18d 22m 09.4s) | C | 60 | 15.5 |\n 77861 | 2024-03-29 16:46:21 | MASTER-Tunka | (14h 38m 08.41s , -17d 38m 54.4s) | C | 60 | 17.1 |\n 77948 | 2024-03-29 16:47:48 | MASTER-Tunka | (14h 43m 59.49s , -16d 29m 36.2s) | C | 60 | 16.7 |\n 77949 | 2024-03-29 16:47:49 | MASTER-Tunka | (14h 45m 17.79s , -15d 46m 24.1s) | C | 60 | 17.5 |\n 78035 | 2024-03-29 16:49:15 | MASTER-Tunka | (14h 59m 41.92s , -16d 31m 40.9s) | C | 60 | 15.7 |\n 78036 | 2024-03-29 16:49:16 | MASTER-Tunka | (15h 01m 00.09s , -15d 48m 28.9s) | C | 60 | 16.2 |\n 78123 | 2024-03-29 16:50:43 | MASTER-Tunka | (14h 51m 54.70s , -14d 36m 43.5s) | C | 60 | 14.7 |\n 78157 | 2024-03-29 16:51:17 | MASTER-Tunka | (14h 53m 11.85s , -13d 53m 33.8s) | C | 60 | 15.4 | Coadd\n 78237 | 2024-03-29 16:52:37 | MASTER-Tunka | (15h 10m 06.13s , -17d 41m 11.5s) | C | 60 | 14.3 | Coadd\n 78286 | 2024-03-29 16:53:27 | MASTER-Tunka | (14h 25m 09.56s , -22d 10m 42.9s) | C | 60 | 15.8 |\n 78321 | 2024-03-29 16:54:01 | MASTER-Tunka | (14h 26m 31.98s , -21d 27m 18.2s) | C | 60 | 16.0 | Coadd\n 78369 | 2024-03-29 16:54:50 | MASTER-Tunka | (15h 07m 35.00s , -14d 36m 19.1s) | C | 60 | 15.5 |\n 78404 | 2024-03-29 16:55:24 | MASTER-Tunka | (15h 08m 52.07s , -13d 53m 10.3s) | C | 60 | 15.8 | Coadd\n 78450 | 2024-03-29 16:56:10 | MASTER-Tunka | (14h 28m 06.63s , -16d 28m 01.7s) | C | 60 | 16.8 |\n 78484 | 2024-03-29 16:56:45 | MASTER-Tunka | (14h 29m 25.11s , -15d 44m 48.3s) | C | 60 | 16.8 | Coadd\n 80063 | 2024-03-29 17:23:03 | MASTER-Tunka | (14h 36m 52.24s , -18d 20m 38.6s) | C | 60 | 15.7 |\n 80150 | 2024-03-29 17:24:30 | MASTER-Tunka | (14h 43m 57.08s , -16d 28m 17.8s) | C | 60 | 13.5 |\n 80198 | 2024-03-29 17:25:18 | MASTER-Tunka | (14h 45m 14.95s , -15d 45m 08.6s) | C | 60 | 14.5 | Coadd\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35992.",
"published": "2024-03-29T17:31:10.830258Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-03-29T17:31:10.830277Z",
"modified": "2024-03-29T17:31:10.837641Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6297,
"topic": "gcn.circular",
"uuid": "53e9ea04-c9b4-4da8-b7af-0f11c838c2b4",
"title": "Fermi GRB 240328A: 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": "24/03/29 17:30:52 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35991"
},
"title": "GCN CIRCULAR",
"number": "35991",
"subject": "Fermi GRB 240328A: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\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, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.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-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB 240328A ( Fermi GBM team, GCN 35986) errorbox 1 days 15952 sec after notice time and 1 days 15986 sec after trigger time at 2024-03-29 16:47:48 UT, with upper limit up to 17.5 mag. The observations began at zenith distance = 75 deg. The sun altitude is -35.1 deg.\n\nThe galactic latitude b = 41 deg., longitude l = 0 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id$09243\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 102416 | 2024-03-29 16:47:48 | MASTER-Tunka | (14h 43m 59.49s , -16d 29m 36.2s) | C | 60 | 16.7 |\n 102417 | 2024-03-29 16:47:49 | MASTER-Tunka | (14h 45m 17.79s , -15d 46m 24.1s) | C | 60 | 17.5 |\n 102503 | 2024-03-29 16:49:15 | MASTER-Tunka | (14h 59m 41.92s , -16d 31m 40.9s) | C | 60 | 15.7 |\n 102504 | 2024-03-29 16:49:16 | MASTER-Tunka | (15h 01m 00.09s , -15d 48m 28.9s) | C | 60 | 16.2 |\n 102591 | 2024-03-29 16:50:43 | MASTER-Tunka | (14h 51m 54.70s , -14d 36m 43.5s) | C | 60 | 14.7 |\n 102625 | 2024-03-29 16:51:17 | MASTER-Tunka | (14h 53m 11.85s , -13d 53m 33.8s) | C | 60 | 15.4 | Coadd\n 102705 | 2024-03-29 16:52:37 | MASTER-Tunka | (15h 10m 06.13s , -17d 41m 11.5s) | C | 60 | 14.3 | Coadd\n 102838 | 2024-03-29 16:54:50 | MASTER-Tunka | (15h 07m 35.00s , -14d 36m 19.1s) | C | 60 | 15.5 |\n 102872 | 2024-03-29 16:55:24 | MASTER-Tunka | (15h 08m 52.07s , -13d 53m 10.3s) | C | 60 | 15.8 | Coadd\n 104618 | 2024-03-29 17:24:30 | MASTER-Tunka | (14h 43m 57.08s , -16d 28m 17.8s) | C | 60 | 13.5 |\n 104666 | 2024-03-29 17:25:18 | MASTER-Tunka | (14h 45m 14.95s , -15d 45m 08.6s) | C | 60 | 14.5 | Coadd\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35991.",
"published": "2024-03-29T17:31:10.844784Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-03-29T17:31:10.844800Z",
"modified": "2024-03-29T17:31:10.847982Z",
"nonlocalizedevents": [],
"targets": []
},
{
"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": 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": 2599,
"topic": "gcn.circular",
"uuid": "5bdf4e11-54e2-48d4-9e10-c0af260635d9",
"title": "LIGO/Virgo/KAGRA S230715bw: Reissue of Retraction of GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "J. C. Driggers at California Institute of Technology, LIGO Hanford Observatory <jenne@caltech.edu>",
"data": {
"date": "23/08/30 06:09:21 GMT",
"from": "J. C. Driggers at California Institute of Technology, LIGO Hanford Observatory <jenne@caltech.edu>",
"title": "GCN CIRCULAR",
"number": "34600",
"subject": "LIGO/Virgo/KAGRA S230715bw: Reissue of Retraction of GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nThis candidate was originally retracted on 15 July 2023 in GCN Circular 34219, and it still remains not a candidate of interest. Due to human error, a Retraction Notice for this candidate was sent out again today.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzMzc1NzY2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.uGZRpHCHf_I5Bv8Uz2osNBnTUhekNqGJk3lfw3-csU8\n\n",
"published": "2023-08-30T06:09:34.374678Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-30T06:09:34.374697Z",
"modified": "2023-08-30T06:09:34.378696Z",
"nonlocalizedevents": [
{
"event_id": "S230715b"
}
],
"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": 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": 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": 4068,
"topic": "gcn.circular",
"uuid": "ce393f73-0565-4751-b65d-102d7d4f4a65",
"title": "LIGO/Virgo/KAGRA S231020ba: Updated Sky localization and EM Bright Classification",
"submitter": "Hop gcn.circular",
"authors": "carl.haster@unlv.edu",
"data": {
"date": "23/10/21 02:42:37 GMT",
"from": "carl.haster@unlv.edu",
"urls": {
"gcn": "https://gcn.nasa.gov/circulars/34863"
},
"title": "GCN CIRCULAR",
"number": "34863",
"subject": "LIGO/Virgo/KAGRA S231020ba: Updated Sky localization and EM Bright Classification"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe have conducted further analysis of the LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S231020ba (GCN Circular 34852). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.offline0.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S231020ba\n\nBased on posterior support from parameter estimation [1], under the assumption that the candidate S231020ba is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [2] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [2] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassgap) is 16%.\n\nFor the Bilby.offline0.multiorder.fits,0 sky map, the 90% credible region is 1339 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 1168 +/- 361 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/userguide/.\n\n [1] Ashton et al. ApJS 241, 27 (2019) and Morisaki et al. arXiv:2307.13380 (2023)\n [2] Chatterjee et al. ApJ 896, 54 (2020)\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/34863.",
"published": "2023-10-21T02:42:47.705556Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-10-21T02:42:47.705577Z",
"modified": "2023-10-21T02:42:47.711309Z",
"nonlocalizedevents": [
{
"event_id": "S231020b"
}
],
"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": []
},
{
"id": 2301,
"topic": "gcn.circular",
"uuid": "e5edd3ca-ade9-4173-83f3-797a2a6b94d5",
"title": "Swift Trigger 1186391 is not a GRB",
"submitter": "Hop gcn.circular",
"authors": "Boris Sbarufatti at INAF-OAB <boris.sbarufatti@inaf.it>",
"data": {
"date": "23/08/21 15:32:22 GMT",
"from": "Boris Sbarufatti at INAF-OAB <boris.sbarufatti@inaf.it>",
"title": "GCN CIRCULAR",
"number": "34513",
"subject": "Swift Trigger 1186391 is not a GRB"
},
"message_text": "\nB. Sbarufatti (INAF-OAB) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nSwift BAT trigger 1186391 at 15:25:12.13 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNjMxOTQ4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.nR2s-jxxxm6a8vIiGI2xNLzDORcqyaQISX9qzrksMdc\n\n",
"published": "2023-08-21T15:32:33.512052Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-21T15:32:33.512075Z",
"modified": "2023-08-21T15:32:33.516322Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2302,
"topic": "gcn.circular",
"uuid": "85fd4b29-cedf-4680-9b35-c666cce83afd",
"title": "GRB 20230818A: GIT optical upper limit",
"submitter": "Hop gcn.circular",
"authors": "Varun Bhalerao at IIT Bombay <varunb@iitb.ac.in>",
"data": {
"date": "23/08/21 16:35:40 GMT",
"from": "Varun Bhalerao at IIT Bombay <varunb@iitb.ac.in>",
"title": "GCN CIRCULAR",
"number": "34514",
"subject": "GRB 20230818A: GIT optical upper limit"
},
"message_text": "R. Kumar (IITB), A. Salgundi (IITB), V. Swain (IITB), H. Kumar (IITB), V. Bhalerao (IITB), G.C. Anupama (IIA), S. Barway (IIA) and K. Angail (IAO) report on behalf of the GIT team:\n\nWe observed the field of GRB230818A (Lipunov et al., GCN 34476; Fermi GBM team, GCN 34478; 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; Pavoni et al., GCN 34490; Klose et al., GCN 34491; Pari et al., GCN 34492; Odeh et al., GCN 34493; Pichay et al., GCN 34498) with the 0.7m GROWTH-India Telescope (GIT). The observations started at 2023-08-19 15:32:24.081 UT, 0.67 days after the Fermi GBM trigger. We obtained 6 images of 300-sec exposures in the r' filter. We did not detect any new source in our stacked image around R.A.= 19h 03m 33.11s, DEC.=+40d 53m 48.5s. The obtained upper limits follow as:\n\n-------------------------------------------------------\nJD (mid) | T-T0 (hours) | Filter | Exposure (s) | Limiting Magnitude (AB)\n-------------------------------------------------------\n2460176.15764106 | 16.326 | r' | 6 x 300 | 21.35\n-------------------------------------------------------\n\nOur results are consistent with the upper limits reported by AKO (Odeh et al., GCN 34493) and the weak detection by SAO RAS Zeiss-1000 (Moskvitin et al., GCN 34495). The magnitudes are calibrated against PanSTARRS DR1 (Chambers et al., 2016) and not corrected for Galactic extinction.\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNjM1NzQ2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.j-r3LGCcKJZCHhHKX-SqS9GsHEYFy6eWDle6FpFU1b8\n\n",
"published": "2023-08-21T16:35:51.974520Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-21T16:35:51.974537Z",
"modified": "2023-08-21T16:35:51.979284Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2309,
"topic": "gcn.circular",
"uuid": "2f547cea-2b2e-4899-b73d-086f8125cdb2",
"title": "GRB 230818A: Swift-BAT refined analysis",
"submitter": "Hop gcn.circular",
"authors": "Tyler Parsotan at NASA GSFC <tyler.parsotan@nasa.gov>",
"data": {
"date": "23/08/21 19:26:51 GMT",
"from": "Tyler Parsotan at NASA GSFC <tyler.parsotan@nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34515",
"subject": "GRB 230818A: Swift-BAT refined analysis"
},
"message_text": "C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC),\nH. A. Krimm (NSF), S. Laha (GSFC/UMBC),\nA. Y. Lien (U Tampa), D. M. Palmer (LANL),\nT. Parsotan (GSFC/UMBC), T. Sakamoto (AGU),\nM. Stamatikos (OSU) (i.e. the Swift-BAT team):\n\n\nUsing the data set from T-60 to T+200 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 230818A (trigger #1186032)\n(Tohuvavohu, et al., GCN Circ. 34479). The BAT ground-calculated position is\nRA, Dec = 285.888, 40.888 deg which is\nRA(J2000) = 19h 03m 33.2s\nDec(J2000) = +40d 53' 16.5\"\nwith an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 32%.\n\n\nThe mask weighted light curve shows a single fast rise exponential decay peak.\nT90 (15-350 keV) is 9.82 +- 1.25 sec (estimated error including systematics).\n\n\nThe time-averaged spectrum from T+0.07 to T+12.10 sec is best fit by a simple\npower-law model. The power law index of the time-averaged spectrum is\n1.36 +- 0.10. The fluence in the 15-150 keV band is 1.9 +- 0.1 x 10^-06 erg/cm2.\nThe 1-sec peak photon flux measured from T+1.59 sec in the 15-150 keV band\nis 6.7 +- 0.5 ph/cm2/sec. All the quoted errors are at the 90% confidence\nlevel.\n\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/1186032/BA/ <http://gcn.gsfc.nasa.gov/notices_s/1186032/BA/>\n\n\n\n\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNjQ2MDE3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.dJX3BD5q-cAv_lhusQkBys2orhoIAN0-QjQtVLVvITg\n\n",
"published": "2023-08-21T19:27:02.506538Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-21T19:27:02.506579Z",
"modified": "2023-08-21T19:27:02.513569Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2310,
"topic": "gcn.circular",
"uuid": "1a2d20b8-7dbc-4af6-bd46-decb56d82f77",
"title": "GRB 230812B: SAO RAS RC-500 and Zeiss-1000 observations",
"submitter": "Hop gcn.circular",
"authors": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"data": {
"date": "23/08/21 19:58:42 GMT",
"from": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"title": "GCN CIRCULAR",
"number": "34516",
"subject": "GRB 230812B: SAO RAS RC-500 and Zeiss-1000 observations"
},
"message_text": "A. S. Moskvitin, V. V. Vlasyuk (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 SAO RAS optical\ntelescopes RC-500 and Zeiss-1000 equipped with the CCD photometers.\nWe obtained 90 x 60 sec. images in Rc band with the 0.5-m telescope\non August 20, 18:36:51--20:27:56 and 6 x 300 sec. images in Rc band\nwith the 1-m telescope on August 20, 21:09:05--21:43:00 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; H. Kumar et al., GCN 34500; Turpin et al.,\nGCN 34508) is clearly detected in our stacked frames\nwith the brightness of R = 21.58 +/- 0.11 (t_mid - t0 = 8.0237 days)\nand R = 21.44 +/- 0.07 (t_mid - t0 = 8.1027 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNjQ3OTI3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.nQ5fG6IJYFuSZvOMVjJzNGWTcAVjRdiMXdpWa--Z_is\n\n",
"published": "2023-08-21T19:58:52.802931Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-21T19:58:52.802948Z",
"modified": "2023-08-21T19:58:52.808331Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2313,
"topic": "gcn.circular",
"uuid": "c249a815-05ca-4373-82be-0abe13109ea1",
"title": "Swift GRB230821.64: 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": "23/08/22 00:11:06 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34517",
"subject": "Swift GRB230821.64: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the Swift GRB230821.64 (trigger No 1186391,05h 34m 58.39s , +21d 24m 12.2s, R=0.05) errorbox 7286 sec after notice time and 7381 sec after trigger time at 2023-08-21 17:28:13 UT, with upper limit up to 15.6 mag. The observations began at zenith distance = 84 deg. The sun altitude is -26.7 deg.\n\nMASTER-Tavrida robotic telescope located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Swift GRB230821.64 errorbox 30910 sec after notice time and 31005 sec after trigger time at 2023-08-22 00:01:57 UT, with upper limit up to 15.6 mag. The observations began at zenith distance = 67 deg. The sun altitude is -26.0 deg.\n\nThe galactic latitude b = -5 deg., longitude l = 185 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"57614\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 7426 | MASTER-Tunka | C | 90 | 13.6 |\n 7427 | MASTER-Tunka | C | 90 | 14.7 |\n 8531 | MASTER-Tunka | C | 90 | 14.5 |\n 8532 | MASTER-Tunka | C | 90 | 15.3 |\n 8648 | MASTER-Tunka | C | 90 | 14.7 |\n 8648 | MASTER-Tunka | C | 90 | 15.6 |\n 9783 | MASTER-Tunka | C | 90 | 13.6 |\n 9784 | MASTER-Tunka | C | 90 | 14.6 |\n 9900 | MASTER-Tunka | C | 90 | 12.7 |\n 9901 | MASTER-Tunka | C | 90 | 13.9 |\n 31096 | MASTER-Tavrida | C | 180 | 15.6 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNjYzMDcyLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.GtnV6HBEBLf3LACAItsRgHNlgCx031WhoPyL3xcXft0\n\n",
"published": "2023-08-22T00:11:17.296234Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-22T00:11:17.296252Z",
"modified": "2023-08-22T00:11:17.302681Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2328,
"topic": "gcn.circular",
"uuid": "dcb0989a-0c94-47e2-b3db-03157a764391",
"title": "GRB 230815A: ATCA detection of radio counterpart",
"submitter": "Hop gcn.circular",
"authors": "James Leung at U of Sydney/VAST <jleu9465@uni.sydney.edu.au>",
"data": {
"date": "23/08/22 11:44:32 GMT",
"from": "James Leung at U of Sydney/VAST <jleu9465@uni.sydney.edu.au>",
"title": "GCN CIRCULAR",
"number": "34518",
"subject": "GRB 230815A: ATCA detection of radio counterpart"
},
"message_text": "J. K. Leung (USyd), G. E. Anderson (Curtin), S. D. Ryder (Macquarie),\nA. J. van der Horst (GWU), A. Gulati (USyd), L. Rhodes (Oxford),\nS. Chastain (UNM) on behalf of the PanRadio GRB collaboration\n\nThe Australia Telescope Compact Array (ATCA) observed long GRB 230815A\n(Klingler et al., GCN 34434; Mailyan et al., GCN 34440) as part of the\nATCA \"PanRadio GRB\" follow-up Large Project C3542 (PI. Anderson) on\n2023-08-17 UT and 2023-08-18 UT.\n\nNo radio sources were detected at the GRB location in the first\nobservation conducted from 2023-08-17 02:00 UT for 10 hrs at 5.5, 9.0,\n16.7 and 21.2 GHz. The 3-sigma upper limits were 75, 69, 324, 741\nmicroJy/beam, respectively. Note the higher than usual rms was due to\nbad weather during the observation.\n\nThe second observation was conducted from 2023-08-18 22:00 UT for 6 hrs\nat 5.5, 9.0 and 44 GHz. In our preliminary analysis, we detect a radio\ncounterpart with a flux density of 70+/-10 microJy at 9 GHz. The fitted\nposition is:\n\nRAJ2000 = 12:18:53.2\nDECJ2000 = -58:03:09.0\nwith an uncertainty of ~0.3\".\n\nThis is in broad agreement with previously reported Swift/XRT (Beardmore\net al., GCN 34437) and VLT/HAWK-I (Schneider et al., GCN 34467)\nafterglow positions. There was also a marginal ~3 sigma detection at\n5.5 GHz (rms\u0014 microJy/beam) and a non-detection at 44 GHz with a\n3-sigma upper limit of 111 microJy/beam.\n\nFurther observations are planned.\n\nWe thank the CSIRO Space and Astronomy staff for supporting these\nobservations. We acknowledge the Gomeroi people as the traditional\nowners of the Observatory site. The Australia Telescope Compact Array is\npart of the Australia Telescope National Facility\n(https://ror.org/05qajvd42) which is funded by the Australian Government\nfor operation as a National Facility managed by CSIRO.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNzA0Njc3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.chsUJ4sS8U7O95wlxtuPlJ9LkeAL6OoAPE-XMgQjtBc\n\n",
"published": "2023-08-22T11:44:45.589314Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-22T11:44:45.589332Z",
"modified": "2023-08-22T11:44:45.595037Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2329,
"topic": "gcn.circular",
"uuid": "fec93823-c914-4104-93ab-c269d1a8ee6e",
"title": "GRB 230812B: Assy optical observations, possible SN rise",
"submitter": "Hop gcn.circular",
"authors": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"data": {
"date": "23/08/22 11:49:56 GMT",
"from": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"title": "GCN CIRCULAR",
"number": "34519",
"subject": "GRB 230812B: Assy optical observations, possible SN rise"
},
"message_text": "N. Pankov (HSE, IKI), V. Kim (FAI), A. Pozanenko (IKI), M. Krugov (FAI), S. Belkin (IKI) report on behalf of GRB IKI FuN:\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 AZT-20 telescope of Assy-Turgen observatory on 2023-08-17 -- 2023-08-21.\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; H. Kumar et al., GCN 34500; Turpin et al.,\nGCN 34508) is clearly detected.\n\nPreliminary photometry of the OT is following\n\nTelescope Date UTstart Exptime Filter t-T0 OT Err UL\n sec days\nAZT-20 2023-08-17 16:51:34 60x60 r 4.932892 21.70 0.05 23.9\nAZT-20 2023-08-17 18:14:50 60x60 i 4.990722 21.87 0.10 23.2\nAZT-20 2023-08-18 16:47:02 60x60 r 5.929748 21.71 0.07 23.8\nAZT-20 2023-08-18 18:05:43 60x60 i 5.984388 21.73 0.10 23.2\nAZT-20 2023-08-20 16:15:33 60x60 r 7.907882 21.70 0.04 24.1\nAZT-20 2023-08-20 17:37:12 60x60 i 7.964583 21.82 0.09 23.3\nAZT-20 2023-08-21 16:31:06 60x60 r 8.918678 21.61 0.05 23.3\nAZT-20 2023-08-21 17:51:59 80x60 i 8.981796 21.39 0.06 23.4\n\nThe photometry is based on nearby SDSS stars.\nSDSS-DR12\nRA Dec r i\n16:36:25.6 +47:53:20.5 17.018 16.857\n16:36:25.2 +47:52:20.9 16.229 16.106\n\nAfter plateau phase between Aug. 15 - Aug.20 at r ~ 21.7, i~ 21.8 which is brighter than a host galaxy (e.g. Legacy Survey DR10 Catalog the host is r~22.66 (Belkin et al., GCN 34412)) the OT is brightening and we can confirm the OT brightening (Moskvitin et al., GCN 34516) which could be related with a supernova rise. The supernova rise have beed also suggested by GIT (GCN 34500).\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNzA1MDAwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.-M02KBh_x1teYImk3IwxCR0rGMl8JAuUUSugoYw6jMU\n\n",
"published": "2023-08-22T11:50:06.394574Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-22T11:50:06.394590Z",
"modified": "2023-08-22T11:50:06.399588Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2335,
"topic": "gcn.circular",
"uuid": "889fc053-8d31-4356-a0da-cd8b03cae86d",
"title": "LIGO/Virgo/KAGRA S230822bm: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Hideyuki Tagoshi at ICRR/U of Tokyo/KAGRA <tagoshi@icrr.u-tokyo.ac.jp>",
"data": {
"date": "23/08/22 23:50:00 GMT",
"from": "Hideyuki Tagoshi at ICRR/U of Tokyo/KAGRA <tagoshi@icrr.u-tokyo.ac.jp>",
"title": "GCN CIRCULAR",
"number": "34520",
"subject": "LIGO/Virgo/KAGRA S230822bm: 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 S230822bm during\nreal-time processing of data from LIGO Hanford Observatory (H1) and\nLIGO Livingston Observatory (L1) at 2023-08-22 23:03:37.497 UTC (GPS\ntime: 1376780635.497). The candidate was found by the CWB [1] and\nGstLAL [2] analysis pipelines.\n\nS230822bm is an event of interest because its false alarm rate, as\nestimated by the online analysis, is 2.6e-08 Hz, or about one in 1\nyear, 2 months. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S230822bm\n\nThe classification of the GW signal, in order of descending\nprobability, is BBH (98%), Terrestrial (2%), NSBH (<1%), or BNS (<1%).\n\nAssuming the candidate is astrophysical in origin, the probability\nthat the lighter compact object is consistent with a neutron star mass\n(HasNS) is <1%. [3] Using the masses and spins inferred from the\nsignal, the probability of matter outside the final compact object\n(HasRemnant) is <1%. [3] Both HasNS and HasRemnant consider the\nsupport of several neutron star equations of state. The probability\nthat either of the binary components lies between 3 and 5 solar masses\n(HasMassGap) is 4%.\n\nTwo sky maps are available at this time and can be retrieved from the\nGraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by\nBAYESTAR [4], distributed via GCN notice about 27 seconds after the\ncandidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by\nBAYESTAR [4], 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\n4472 deg2. Marginalized over the whole sky, the a posteriori\nluminosity distance estimate is 6854 +/- 2325 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] Chatterjee et al. ApJ 896, 54 (2020)\n [4] 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNzQ4MjA2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Z43bFUFCr_0SuyeVSSDXt5P9kNVUY13JUHMR_eiK4yw\n\n",
"published": "2023-08-22T23:50:15.629701Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-22T23:50:15.629729Z",
"modified": "2023-08-22T23:50:15.641289Z",
"nonlocalizedevents": [
{
"event_id": "S230822b"
}
],
"targets": []
},
{
"id": 2336,
"topic": "gcn.circular",
"uuid": "c15276e1-749a-49b0-a926-7cc97f0d0e2e",
"title": "GRB 230822A: 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": "23/08/22 23:59:33 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"title": "GCN CIRCULAR",
"number": "34521",
"subject": "GRB 230822A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 23:48:54 UT on 22 Aug 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230822A (trigger 714440939.403512 / 230822992).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 143.4, Dec = 38.0 (J2000 degrees, equivalent to J2000 09h 33m, 38d 00'), with a statistical uncertainty of 18.4 degrees.\n\nThe angle from the Fermi LAT boresight is 78.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230822992/quicklook/glg_skymap_all_bn230822992.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/bn230822992/quicklook/glg_healpix_all_bn230822992.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230822992/quicklook/glg_lc_medres34_bn230822992.gif\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNzQ4Nzc5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.JE8vYW16f9t8IWjqf_prrPnXq5f2wIok3hPk2q338gI\n\n",
"published": "2023-08-22T23:59:43.885759Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-22T23:59:43.885788Z",
"modified": "2023-08-22T23:59:43.897264Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2606,
"topic": "gcn.circular",
"uuid": "7a9b9683-2d05-48be-ada1-a8f1be6b6de9",
"title": "GRB 230827B: Swift-XRT afterglow detection",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/08/30 13:26:29 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34601",
"subject": "GRB 230827B: Swift-XRT afterglow detection"
},
"message_text": "A. Tohuvavohu (U. Toronto), J.P. Osborne (U. Leicester), K.L. Page (U.\nLeicester), A.P. Beardmore (U. Leicester), M. Perri (SSDC & INAF-OAR),\nV. D'Elia (SSDC & INAF-OAR), B. Sbarufatti (INAF-OAB), D.N. Burrows\n(PSU), J. D. Gropp (PSU) and P.A. Evans (U. Leicester) reports on\nbehalf of the Swift-XRT team:\n\nSwift-XRT has performed follow-up observations of the\nFermi/GBM-detected burst GRB 230827B (GCN Circ. 34584), collecting 3.6\nks of Photon Counting (PC) mode data between T0+231.3 ks and T0+249.7\nks.\n\nAn uncatalogued X-ray source is detected consistent with being within\n9.9 arcsec of the position of ZTF23abaanxz/AT2023qxj (GCN Circ. 34574)\nand is believed to be the afterglow. Using 3821 s of PC mode data and 4\nUVOT images, we find an enhanced XRT position (using the XRT-UVOT\nalignment and matching UVOT field sources to the USNO-B1 catalogue):\nRA, Dec = 299.63944, +54.46318 which is equivalent to:\n\nRA (J2000): 19h 58m 33.47s\nDec(J2000): +54d 27' 47.5\"\n\nwith an uncertainty of 2.6 arcsec (radius, 90% confidence). This\nposition is 0.8 arcsec from the ZTF position. The light curve is\nconsistent with a constant source of mean count rate 7.0e-02 ct/sec. A\npower-law fit gives an index of 2.490 (+0.015, -2.990).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 1.59 (+0.33, -0.30). The\nbest-fitting absorption column is 4.0 (+2.1, -1.0) x 10^21 cm^-2,\nconsistent with the Galactic value of 3.0 x 10^21 cm^-2 (Willingale et\nal. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux\nconversion factor deduced from this spectrum is 5.0 x 10^-11 (6.4 x\n10^-11) erg cm^-2 count^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 4.0 (+2.1, -1.0) x 10^21 cm^-2\nGalactic foreground: 3.0 x 10^21 cm^-2\nExcess significance: <1.6 sigma\nPhoton index:\t 1.59 (+0.33, -0.30)\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/00021620.\nThe results of the full analysis of the XRT observations are available\nat https://www.swift.ac.uk/ToO_GRBs/00021620.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzNDAxOTk1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.P4bSfm4m4t4sxFrog06-Q-gV9iyUCpa967FvvTQHZb8\n\n",
"published": "2023-08-30T13:26:44.010033Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-30T13:26:44.010053Z",
"modified": "2023-08-30T13:26:44.014352Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2607,
"topic": "gcn.circular",
"uuid": "f3b98c20-548a-40f0-9db5-76c38356f036",
"title": "GRB 230826A: Glowbug gamma-ray detection",
"submitter": "Hop gcn.circular",
"authors": "matthew.kerr@gmail.com",
"data": {
"date": "23/08/30 14:50:37 GMT",
"from": "matthew.kerr@gmail.com",
"title": "GCN CIRCULAR",
"number": "34602",
"subject": "GRB 230826A: Glowbug gamma-ray detection"
},
"message_text": "M. Kerr, C.C. Cheung, J. E. Grove, R. Woolf (NRL), A. Goldstein (USRA), C.A. Wilson-Hodge (MSFC), and M.S. Briggs (UAH) report:\n\nThe Glowbug gamma-ray telescope [1,2], operating on the International Space Station, reports the detection of GRB 230826A, which was also detected by Fermi/GBM, Swift/BAT, GRBAlpha, and VZLUSAT-2 (GCN 34564, 34565, 34572, 34586).\n\nUsing an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2023-08-26 19:32:44.336 with a duration of 12.3 s and a total significance of about 29.9 sigma. The light curve comprises a single peak.\n\nUsing a standard power-law function with an exponential high-energy cutoff [3] to model the emission over this duration results in a poorly constrained power-law index and a cutoff energy (\"Epeak\") of 138 keV. The modeled 10-10000 keV fluence is 1.5e-06 erg/cm^2.\n\nThe analysis results presented here are preliminary and use a response function that lacks a detailed characterization of the surrounding passive structure of the ISS.\n\nGlowbug is a NASA-funded technology demonstrator for sensitive, low-cost gamma-ray transient telescopes developed, built, and operated by the U.S. Naval Research Laboratory (NRL) with support from the University of Alabama in Huntsville, USRA, and NASA MSFC. It was launched on 2023 March 15 aboard the Department of Defense Space Test Programâs STP-H9 to the ISS. The detector comprises 12 large-area (15 cm x 15 cm) CsI:Tl panels covering the surface of a half cube, and two hexagonal (5-cm diameter, 10-cm length) CLLB scintillators, giving it a large field of view (instantaneous FoV ~2/3 sky) over a wide energy band of 50 keV to >2 MeV.\n\n[1] Grove, J.E. et al. 2020, Proc. Yamada Conf. LXXI, arXiv:2009.11959\n[2] Woolf, R.S. et al. 2022, Proc. SPIE, 12181, id. 121811O\n[3] Goldstein, A. et al. 2020, ApJ 895, 40, arXiv :1909.03006\n\nDistribution Statement A: Approved for public release. Distribution is unlimited.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzNDA3MDQzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.xeYzdh3QVmKuidQ8GaB8jMP2QyleGn0dRvdTzD5o0fc\n\n",
"published": "2023-08-30T14:50:54.316189Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-30T14:50:54.316205Z",
"modified": "2023-08-30T14:50:54.320018Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2608,
"topic": "gcn.circular",
"uuid": "07e91b04-63a6-47c9-9946-b990a7867fab",
"title": "GRB 230827A: Glowbug gamma-ray detection",
"submitter": "Hop gcn.circular",
"authors": "matthew.kerr@gmail.com",
"data": {
"date": "23/08/30 14:50:54 GMT",
"from": "matthew.kerr@gmail.com",
"title": "GCN CIRCULAR",
"number": "34603",
"subject": "GRB 230827A: Glowbug gamma-ray detection"
},
"message_text": "M. Kerr, C.C. Cheung, J. E. Grove, R. Woolf (NRL), A. Goldstein (USRA), C.A. Wilson-Hodge (MSFC), and M.S. Briggs (UAH) report:\n\nThe Glowbug [1,2] gamma-ray telescope, operating on the International Space Station, reports the detection of GRB 230827A, which was also detected by Fermi/GBM, GRBAlpha, Swift/BAT-GUANO, VZLUSAT-2, and INTEGRAL/SPI-ACS (GCN 34575, 34583, 34587, 34588).\n\nUsing an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2023-08-27 18:17:50.272 with a duration of 100.4 s and a total significance of about 78.2 sigma. The light curve comprises two broad peaks each of about 50s duration, with the peak flux observed roughly at the center of the first pulse.\n\nUsing a standard power-law function with an exponential high-energy cutoff [3] to model the emission over this duration results in a photon index dN/dE~E^x of x=-0.5 and a cutoff energy (\"Epeak\") of 371 keV. The modeled 10-10000 keV fluence is 2.9e-05 erg/cm^2.\n\nThe analysis results presented here are preliminary and use a response function that lacks a detailed characterization of the surrounding passive structure of the ISS.\n\nGlowbug is a NASA-funded technology demonstrator for sensitive, low-cost gamma-ray transient telescopes developed, built, and operated by the U.S. Naval Research Laboratory (NRL) with support from the University of Alabama in Huntsville, USRA, and NASA MSFC. It was launched on 2023 March 15 aboard the Department of Defense Space Test Programâs STP-H9 to the ISS. The detector comprises 12 large-area (15 cm x 15 cm) CsI:Tl panels covering the surface of a half cube, and two hexagonal (5-cm diameter, 10-cm length) CLLB scintillators, giving it a large field of view (instantaneous FoV ~2/3 sky) over a wide energy band of 50 keV to >2 MeV.\n\n[1] Grove, J.E. et al. 2020, Proc. Yamada Conf. LXXI, arXiv:2009.11959\n[2] Woolf, R.S. et al. 2022, Proc. SPIE, 12181, id. 121811O\n[3] Goldstein, A. et al. 2020, ApJ 895, 40, arXiv :1909.03006\n\nDistribution Statement A: Approved for public release. Distribution is unlimited.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzNDA3MDU2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.FW2_YufzxkX26v_XdBG7t9GQ6xspaTisuKe1ztlA28s\n\n",
"published": "2023-08-30T14:51:01.335662Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-30T14:51:01.335679Z",
"modified": "2023-08-30T14:51:01.339465Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2609,
"topic": "gcn.circular",
"uuid": "93c9b525-9fca-434f-90a3-e3c68230f024",
"title": "GRB 230827B: Glowbug gamma-ray detection",
"submitter": "Hop gcn.circular",
"authors": "matthew.kerr@gmail.com",
"data": {
"date": "23/08/30 14:51:11 GMT",
"from": "matthew.kerr@gmail.com",
"title": "GCN CIRCULAR",
"number": "34604",
"subject": "GRB 230827B: Glowbug gamma-ray detection"
},
"message_text": "M. Kerr, C.C. Cheung, J. E. Grove, R. Woolf (NRL), A. Goldstein (USRA), C.A. Wilson-Hodge (MSFC), and M.S. Briggs (UAH) report:\n\nThe Glowbug [1,2] gamma-ray telescope, operating on the International Space Station, reports the detection of GRB 230827B, which was also detected by Fermi/GBM, VZLUSAT-2, GECAM-B (trigger 215), INTEGRAL/SPI-ACS, and CALET (GCN 34584, 34585, 34593).\n\nUsing an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2023-08-27 06:08:30.320 with a duration of 10.6 s and a total significance of about 57.8 sigma. The light-curve comprises two similar FRED pulses with widths of about 1s, separated by about 5s, each with tails of faint emission lasting about 5s.\n\nUsing a standard power-law function with an exponential high-energy cutoff [3] to model the emission over this duration results in a photon index dN/dE~E^x of x=0.4 and a cutoff energy (\"Epeak\") of 272 keV. The modeled 10-10000 keV fluence is 1.3e-05 erg/cm^2.\n\nThe analysis results presented here are preliminary and use a response function that lacks a detailed characterization of the surrounding passive structure of the ISS.\n\nGlowbug is a NASA-funded technology demonstrator for sensitive, low-cost gamma-ray transient telescopes developed, built, and operated by the U.S. Naval Research Laboratory (NRL) with support from the University of Alabama in Huntsville, USRA, and NASA MSFC. It was launched on 2023 March 15 aboard the Department of Defense Space Test Programâs STP-H9 to the ISS. The detector comprises 12 large-area (15 cm x 15 cm) CsI:Tl panels covering the surface of a half cube, and two hexagonal (5-cm diameter, 10-cm length) CLLB scintillators, giving it a large field of view (instantaneous FoV ~2/3 sky) over a wide energy band of 50 keV to >2 MeV.\n\n[1] Grove, J.E. et al. 2020, Proc. Yamada Conf. LXXI, arXiv:2009.11959\n[2] Woolf, R.S. et al. 2022, Proc. SPIE, 12181, id. 121811O\n[3] Goldstein, A. et al. 2020, ApJ 895, 40, arXiv :1909.03006\n\nDistribution Statement A: Approved for public release. Distribution is unlimited.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkzNDA3MDczLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Ypv_1b-dKlqikKq-S2jJVa0J9PjLY4WujDw37XFEe1s\n\n",
"published": "2023-08-30T14:51:15.369406Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-30T14:51:15.369423Z",
"modified": "2023-08-30T14:51:15.373165Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6298,
"topic": "gcn.circular",
"uuid": "b0c0199b-c3b8-4675-9373-642169b9147f",
"title": "GRB 240329A: 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": "24/03/29 21:53:41 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35993"
},
"title": "GCN CIRCULAR",
"number": "35993",
"subject": "GRB 240329A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 21:43:07 UT on 29 Mar 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240329A (trigger 733441392.528372 / 240329905).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 259.7, Dec = -4.8 (J2000 degrees, equivalent to J2000 17h 18m, -4d 47'), with a statistical uncertainty of 3.8 degrees.\n\nThe angle from the Fermi LAT boresight is 97.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240329905/quicklook/glg_skymap_all_bn240329905.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/2024/bn240329905/quicklook/glg_healpix_all_bn240329905.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240329905/quicklook/glg_lc_medres34_bn240329905.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35993.",
"published": "2024-03-29T21:53:56.617374Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-03-29T21:53:56.617391Z",
"modified": "2024-03-29T21:53:56.622079Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2342,
"topic": "gcn.circular",
"uuid": "52d83d9a-f6f2-4a3d-8d56-d3f2005067d5",
"title": "LIGO/Virgo/KAGRA S230822bm: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "Aaron Zimmerman at U. of Texas at Austin <aaron.zimmerman@utexas.edu>",
"data": {
"date": "23/08/23 02:28:53 GMT",
"from": "Aaron Zimmerman at U. of Texas at Austin <aaron.zimmerman@utexas.edu>",
"title": "GCN CIRCULAR",
"number": "34522",
"subject": "LIGO/Virgo/KAGRA S230822bm: 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 S230822bm (GCN Circular 34520). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S230822bm\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 3974 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 5154 +/- 1771 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\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNzU3NzM4LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.J8JBaKdFAD5i1_IP6u1yrKio3u81fGg08z_jyoHdGps\n\n",
"published": "2023-08-23T02:29:07.241883Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-23T02:29:07.241915Z",
"modified": "2023-08-23T02:29:07.253290Z",
"nonlocalizedevents": [
{
"event_id": "S230822b"
}
],
"targets": []
},
{
"id": 2343,
"topic": "gcn.circular",
"uuid": "e7026ae5-c3e7-4cbb-8dd3-ef7a3248a7c9",
"title": "GRID detection of GRB 230818A",
"submitter": "Hop gcn.circular",
"authors": "GRID Student Team at Tsinghua University <grid@tsinghua.edu.cn>",
"data": {
"date": "23/08/23 02:35:17 GMT",
"from": "GRID Student Team at Tsinghua University <grid@tsinghua.edu.cn>",
"title": "GCN CIRCULAR",
"number": "34523",
"subject": "GRID detection of GRB 230818A"
},
"message_text": "Chenyu Wang and Zirui Yang report on behalf of the GRID Collaboration:\n\nThe long-duration GRB 230818A (Fermi/GBM detection: GCN Circular 34478 and Swift/BAT detection: GCN Circular 34479 ) was observed with GRID-03B.\n\nThe detection was confirmed at the trigger time 2023-08-18T23:27:30 UTC. The measured burst duration (T90) in the 30-2000 keV range is approximately 8.75 ± 1.63 seconds..\n\nGRID is a student-led project to monitor the transient gamma-ray sky with multiple detectors onboard different nanosatellites in the era of multi-messenger astronomy. For more information about GRID, please refer to the following references: https://doi.org/10.1007/s10686-019-09636-w and https://doi.org/10.1007/s10686-021-09819-4.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyNzU4MTIzLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Kq9pFAQVOnBB5hQA5xWZPmcfuZxn2mssECU9j8F1J1U\n\n",
"published": "2023-08-23T02:35:28.225587Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-23T02:35:28.225617Z",
"modified": "2023-08-23T02:35:28.231225Z",
"nonlocalizedevents": [],
"targets": []
}
]
}
