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{
"id": 2101,
"topic": "igwn.gwalert",
"uuid": "d4e15a59-fc70-4b55-8694-12b151dc004c",
"title": "S230815r - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230815r/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230815r/view/"
},
"event": {
"far": 4.82477833751343e-06,
"time": "2023-08-15T09:59:03.011Z",
"group": "CBC",
"search": "AllSky",
"area_50": 2084.8054147045386,
"area_90": 7405.927125343339,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.04264138160689884,
"HasRemnant": 0.0
},
"instruments": [
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"L1"
],
"significant": false,
"skymap_hash": "6e311aa07ff5d22b2f1ec56daa799ccf",
"classification": {
"BBH": 0.28976856755206165,
"BNS": 2.2651343902916698e-13,
"NSBH": 1.7042661368610876e-11,
"Terrestrial": 0.7102314324306691
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-15T09:59:30Z",
"superevent_id": "S230815r",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-15T09:59:31.389398Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-15T09:59:31.389418Z",
"modified": "2023-08-15T09:59:31.393102Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2102,
"topic": "igwn.gwalert",
"uuid": "836cbe36-08a2-4584-a028-b41aba9528b4",
"title": "S230815r - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230815r/files/bayestar.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230815r/view/"
},
"event": {
"far": 4.82477833751343e-06,
"time": "2023-08-15T09:59:03.011Z",
"group": "CBC",
"search": "AllSky",
"area_50": 2084.8054147045386,
"area_90": 7405.927125343339,
"duration": null,
"pipeline": "gstlal",
"properties": {
"HasNS": 0.0,
"HasMassGap": 0.04264138160689884,
"HasRemnant": 0.0
},
"instruments": [
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"L1"
],
"significant": false,
"skymap_hash": "6e311aa07ff5d22b2f1ec56daa799ccf",
"classification": {
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"BNS": 2.2651343902916698e-13,
"NSBH": 1.7042661368610876e-11,
"Terrestrial": 0.7102314324306691
},
"skymap_version": 0,
"central_frequency": null
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-15T10:04:04Z",
"superevent_id": "S230815r",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-15T10:04:06.007640Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-15T10:04:06.007662Z",
"modified": "2023-08-15T10:04:06.013723Z",
"nonlocalizedevents": [],
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},
{
"id": 2103,
"topic": "gcn.circular",
"uuid": "9bd00172-1acb-4c79-8755-dcef984f8569",
"title": "GRB 230812B: AMI-LA radio detection of afterglow candidate",
"submitter": "Hop gcn.circular",
"authors": "Lauren Rhodes at Oxford <lauren.rhodes@physics.ox.ac.uk>",
"data": {
"date": "23/08/15 10:57:05 GMT",
"from": "Lauren Rhodes at Oxford <lauren.rhodes@physics.ox.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34433",
"subject": "GRB 230812B: AMI-LA radio detection of afterglow candidate"
},
"message_text": "Lauren Rhodes, Joe Bright, Rob Fender (Oxford), Dave Green, Dave Titterington (Cambridge) report:\n\nWe observed the field of the gamma-ray burst GRB 230812B (GCN 34286) with the Arcminute Microkelvin Imager Large-Array (AMI-LA) at 15.5 GHz beginning at UT 18:13:51.9 on 14-Aug-2023 for a total of 4 hours. The flux standard 3c286 was used to calibrate the bandpass response and flux scale of the AMI-LA and J1658+4737 was used as an interleaved complex gain calibrator.\nWe detect a unresolved source at a position consistent with the one reported in GCN 34394 with a (preliminary) peak flux density of 280uJy/beam. The rms noise in the field is 40uJy/beam. Further observations are planned.\n\nWe thank the staff at the Mullard Radio Astronomy Observatory for carrying out these observations and operating the AMI-LA.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDk3MDMwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.P15Jm4McvKFWDrztAz4SrbKOUuEvBoM8zaAO4Ws4y04\n\n",
"published": "2023-08-15T10:57:15.709226Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-15T10:57:15.709264Z",
"modified": "2023-08-15T10:57:15.718340Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2104,
"topic": "gcn.circular",
"uuid": "f1989f9f-e9c4-4d1b-a4dc-6a876375616e",
"title": "GRB 230815A: Swift detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"data": {
"date": "23/08/15 11:25:59 GMT",
"from": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34434",
"subject": "GRB 230815A: Swift detection of a burst"
},
"message_text": "\nN. J. Klingler (GSFC/UMBC/CRESSTII), C. Gronwall (PSU),\nK. L. Page (U Leicester), D. M. Palmer (LANL) and\nT. M. Parsotan (GSFC/UMBC/CRESSTII) report on behalf of the Neil\nGehrels Swift Observatory Team:\n\nAt 10:49:55 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 230815A (trigger\u001185505). Swift slewed immediately to the burst.\nThe BAT on-board calculated location is\nRA, Dec 184.772, -58.065 which is\n RA(J2000) = 12h 19m 05s\n Dec(J2000) = -58d 03' 53\"\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 2 sec. The peak count rate\nwas ~6000 counts/sec (15-350 keV), at ~0 sec after the trigger.\n\nThe XRT began observing the field at 10:52:04.0 UT, 128.1 seconds after\nthe BAT trigger. Using promptly downlinked data we find a bright,\nuncatalogued X-ray source located at RA, Dec 184.72347, -58.05386 which\nis equivalent to:\n RA(J2000) = 12h 18m 53.63s\n Dec(J2000) = -58d 03' 13.9\"\nwith an uncertainty of 3.5 arcseconds (radius, 90% containment). This\nposition may be improved as more data are received; the latest position\nis available 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 (4.94 x\n10^21 cm^-2, Willingale et al. 2013), with an excess column of 7.8\n(+3.75/-3.24) x 10^21 cm^-2 (90% confidence).\n\nThe initial flux in the 2.5 s image was 2.07e-09 erg cm^-2 s^-1 (0.2-10\nkeV).\n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 155 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. Because of the density of catalogued stars, further\nanalysis is required to report an upper limit for any afterglow in the\nsub-image. Data from the list of sources generated on-board are not available\nat this time. No correction has been made for the large, but uncertain,\nextinction expected.\n\nBurst Advocate for this burst is N. J. Klingler (noelklin AT umbc.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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMDk4NzY1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.ANtaHSYMcV-ateNjJY04InqXz89A9227fqU1JRS-I3A\n\n",
"published": "2023-08-15T11:26:10.886652Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-15T11:26:10.886685Z",
"modified": "2023-08-15T11:26:10.898163Z",
"nonlocalizedevents": [],
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},
{
"id": 2105,
"topic": "gcn.circular",
"uuid": "6e6d26fa-ebcb-4190-aab0-f799509a2b73",
"title": "GRB 230812B: Tautenburg observations",
"submitter": "Hop gcn.circular",
"authors": "Sylvio Klose at TLS Tautenburg <klose@tls-tautenburg.de>",
"data": {
"date": "23/08/15 13:55:41 GMT",
"from": "Sylvio Klose at TLS Tautenburg <klose@tls-tautenburg.de>",
"title": "GCN CIRCULAR",
"number": "34435",
"subject": "GRB 230812B: Tautenburg observations"
},
"message_text": "\nS. Klose, S. Melnikov, B. Stecklum, A. Nicuesa Guelbenzu, and F. Ludwig (all TLS Tautenburg) report:\n\nWe observed the field of GRB 230812B (Lesage et al., GCN 34387; Roberts et al., GCN 34391; Scotton et al., GCN 34392; Xiong et al., GCN 34401; Casentini et al., GCN 34402; Frederiks et al., GCN 34403) with the Tautenburg 1.34m Schmidt telescope equipped with the TAUKAM 6k x 6k CCD camera. Observations consisted of 3 x 90 sec exposures using the Sloan g, r, and i-band filter.\n\nFor the optical transient (first reported by Zheng et al., GCN 34395, and Lipunov et al, GCN 34396) we measure the following preliminary AB magnitudes (2.19 days post burst):\n\ng = 21.85 +/- 0.25 (midtime: August 14, 2023, 23:23:33 UT),\n\nr = 21.28 +/- 0.13 (midtime: August 14, 2023, 23:30:37 UT),\n\ni = 21.29 +/- 0.14 (midtime: August 14, 2023, 23:37:44 UT),\n\ncalibrated against SDSS stars in the field.\n\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMTA3NzQ2LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Pu4B4nuDqMIoIsbuOQf8Ld575KrvHrPqiigzIIOlwts\n\n",
"published": "2023-08-15T13:55:51.488293Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-15T13:55:51.488311Z",
"modified": "2023-08-15T13:55:51.492327Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2106,
"topic": "gcn.circular",
"uuid": "cd609855-08ee-4165-952d-1d9bd8ccda37",
"title": "GRB 230812B: Iota Scorpii Observatory, La Spezia, Italy",
"submitter": "Hop gcn.circular",
"authors": "GIULIO SCARFI at IOTA SCORPII OBSERVATORY <terziaria@gmail.com>",
"data": {
"date": "23/08/15 14:09:22 GMT",
"from": "GIULIO SCARFI at IOTA SCORPII OBSERVATORY <terziaria@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34436",
"subject": "GRB 230812B: Iota Scorpii Observatory, La Spezia, Italy"
},
"message_text": "Giulio Scarfì (Iota Scorpii Observatory, La Spezia,Italy)\nmail terziaria@gmail.com\n\nIn a large collaboration with:\nM.G. Dainotti (National Astronomical Observatory of Japan),\nY. Niino (Tokyo University, Institute of Astronomy),\nK. Kalinowski (Aarhus University, Department of Physics and Astronomy),\nB. De Simone (Universita' degli Studi Di Salerno)\n\nMembers of:\n\nGAD - Gruppo Astronomia Digitale.\nAAVSO - American Association of Variable Star Observers.\nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili-GRB.\n\nreport:\n\nI have observed the field of GRB 230812B (Lesage et al., GCN 34387;\nScotton et al., GCN 34392; Page, GCN 34394; Zheng & Filippenko, GCN\n34395; Lipunov et al., GCN 34396; Salgundi et al., GCN 34397; Ackley\net al., GCN 34398; Xiong et al., GCN 34401; Casentini et al., GCN\n34002; Frederiks et al., GCN 34403; Mao et al., GCN 34404; Odeh et\nal., GCN 34405; Moskvitin & Spiridonova GCN 34406; Leonini et al. GCN\n34408; de Ugarte Postigo et al. GCN 34409; de Ugarte Postigo et al.\nGCN 34410; Belkin et al. GCN 34412; Ruocco et al. GCN 34413; Frederiks\net al. GCN 34414; Ruocco et al. GCN 34415; Shrestha et al. GCN 34416;\nQuadri et al. GCN 34417; Adami et al. GCN 34418; Moretti et al. GCN\n34419; Kumar et al. GCN 34420; Belkin et al. GCN 34421 & GCN 34423;\nPyshna et al., GCN 34425) with my 0.40-m Ritchey-Cretien telescope.\n\nThe observations started 1660 min after the GRB trigger, at the end of\ntwilight,\nwith a Ritchey Cretien D=406 mm with reducer F/D=6,15.\nWeather conditions were good.\n\n\nAdd 12 x 300 sec. unfiltered images on August 13 2023,\nfrom 20:26:35 to 21:21:42 UT\n\n\nStart T0+     End T0+      R lim\n1660 min       1735 min        20\n\n\nI confirm a fading afterglow\n\n\nThe results of photometry are:\n\n\n     JD        mag     Err  Flt\n\n2460170.36555307  19.85 +/- 0.2  CLEAR\n\n\nMagnitudes were estimated with the Atlas catalog and\nare not corrected for galactic dust extinction.\n\n\n\nReference:\nhttp://www.iotascorpiiobservatory.it\n\n\n\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMTA4NTY3LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.R3WXyANGEKOSoTO7XEoqZ1yCw8yIBEcWu_eFIG1ITHc\n\n",
"published": "2023-08-15T14:09:33.651718Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-15T14:09:33.651735Z",
"modified": "2023-08-15T14:09:33.655941Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2107,
"topic": "gcn.circular",
"uuid": "6e8768e9-af5a-4168-a40a-7ed11ce9740c",
"title": "GRB 230815A: Enhanced Swift-XRT position",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/08/15 16:44:53 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"title": "GCN CIRCULAR",
"number": "34437",
"subject": "GRB 230815A: Enhanced Swift-XRT position"
},
"message_text": "A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester)\nreport on behalf of the Swift-XRT team.\n\nUsing 927 s of XRT Photon Counting mode data and 1 UVOT\nimages for GRB 230815A, 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 = 184.72225, -58.05290 which is equivalent\nto:\n\nRA (J2000): 12h 18m 53.34s\nDec (J2000): -58d 03' 10.4\"\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMTE3ODk5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.qkzmvftMtJGL1qvp0elIVJ7rOcJftfj3ZWCvakobMgs\n\n",
"published": "2023-08-15T16:45:08.485052Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-15T16:45:08.485072Z",
"modified": "2023-08-15T16:45:08.490345Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2108,
"topic": "gcn.circular",
"uuid": "460a8974-2d02-45d6-a63c-da874b9db338",
"title": "Fermi GRB 230814A: 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": "23/08/15 18:01:46 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34438",
"subject": "Fermi GRB 230814A: 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 230814A ( Fermi GBM team, GCN 34422) errorbox 82226 sec after notice time and 82259 sec after trigger time at 2023-08-15 17:45:55 UT, with upper limit up to 16.4 mag. Observations started at twilight. The observations began at zenith distance = 61 deg. The sun altitude is -10.2 deg.\n\nThe galactic latitude b = -12 deg., longitude l = 23 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"54257\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 82290 | 2023-08-15 17:45:55 | MASTER-Tavrida | (19h 18m 54.47s , -11d 57m 39.1s) | C | 60 | 16.2 |\n 82364 | 2023-08-15 17:47:10 | MASTER-Tavrida | (19h 02m 19.60s , -17d 37m 39.4s) | C | 60 | 16.4 |\n 82438 | 2023-08-15 17:48:23 | MASTER-Tavrida | (19h 18m 19.74s , -17d 38m 18.6s) | C | 60 | 16.4 |\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMTIyNTExLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.h7KiAyyQrBTiqSjIJpuKuTW4DJbHdX29L1rME2T1HM8\n\n",
"published": "2023-08-15T18:01:56.889649Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-15T18:01:56.889668Z",
"modified": "2023-08-15T18:01:56.895616Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2109,
"topic": "gcn.circular",
"uuid": "f619dcfc-e6bf-49b6-80c9-05d9ecbf727b",
"title": "Swift GRB 230815A: 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": "23/08/15 19:54:30 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"title": "GCN CIRCULAR",
"number": "34439",
"subject": "Swift GRB 230815A: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,\nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov\n(Blagoveschensk Educational State University)\n\n\nMASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) was pointed to the Swift GRB 230815A ( N. J. Klingler et al., GCN 34434) errorbox 27081 sec after notice time and 28191 sec after trigger time at 2023-08-15 18:41:55 UT, with upper limit up to 17.4 mag. The observations began at zenith distance = 58 deg. The sun altitude is -32.4 deg.\n\nThe galactic latitude b = 4 deg., longitude l = 299 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id\"54590\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 28282 | MASTER-SAAO | C | 180 | 16.8 |\n 29125 | MASTER-SAAO | C | 180 | 17.4 |\n 29335 | MASTER-SAAO | C | 180 | 17.3 |\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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMTI5Mjc1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.X52TKX0n3OUBikD_BshW7aidhi1nIuS5d3P1gwLPQnw\n\n",
"published": "2023-08-15T19:54:41.270870Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-15T19:54:41.270917Z",
"modified": "2023-08-15T19:54:41.276612Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2110,
"topic": "gcn.circular",
"uuid": "89f3b6a7-485f-4431-9200-6b0cbbc8e779",
"title": "GRB 230815A: Fermi GBM detection",
"submitter": "Hop gcn.circular",
"authors": "Bagrat Mailyan at Florida Tech <mbagrat@gmail.com>",
"data": {
"date": "23/08/15 20:38:44 GMT",
"from": "Bagrat Mailyan at Florida Tech <mbagrat@gmail.com>",
"title": "GCN CIRCULAR",
"number": "34440",
"subject": "GRB 230815A: Fermi GBM detection"
},
"message_text": "B. Mailyan (Florida tech), A. von Kienlin (MPE) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 10:49:54.66 UT on 15 August 2023, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 230815A (trigger 713789399/230815451).\nwhich was also detected by Swift BAT (N. J. Klingler et al. 2023, GCN 34434).\nThe Fermi GBM on-ground location is consistent with the Swift BAT position.\n\nThe angle from the Fermi LAT boresight is 159 degrees.\n\nThe GBM light curve consists of a single emission episode with a duration (T90)\nof about 5.2 s (50-300 keV). The time-averaged spectrum\nfrom T0+0.002 to T0+3.264 s is best fit by\na Band function with Epeak = 235 +/- 25 keV,\nalpha = -0.6 +/- 0.1, and beta = -2.22 +/- 0.09.\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.20 +/- 0.03)E-05 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+1.1 s in the 10-1000 keV band is 27 +/- 2 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMTMxOTMwLCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.ie9B6VBVXiZZ8ZVdzCuOSMX-rbtZuL-uCq3slRFCDSg\n\n",
"published": "2023-08-15T20:38:54.850566Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-15T20:38:54.850584Z",
"modified": "2023-08-15T20:38:54.854648Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2111,
"topic": "gcn.circular",
"uuid": "0fe71dba-8d18-4c67-a789-a3ab6203a5cd",
"title": "GRB230815A: BOOTES-6/DPRT optical upper limit",
"submitter": "Hop gcn.circular",
"authors": "Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>",
"data": {
"date": "23/08/15 21:30:53 GMT",
"from": "Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>",
"title": "GCN CIRCULAR",
"number": "34441",
"subject": "GRB230815A: BOOTES-6/DPRT optical upper limit"
},
"message_text": "E. Fernandez-Garcia, Y.-D. Hu, I. Perez-Garcia, M.D. Caballero-Garcia, R. Sanchez-Ramirez, S. Guziy and A. J. Castro-Tirado (IAA-CSIC, Granada), P. J. Meintjes and H. J. van Heerden (UFS, SouthAfrica), A. Martin-Carrillo and L. Hanlon (UCD, Ireland) and C. J. Perez del Pulgar (UMA, Malaga), on behalf of a larger collaboration, report:\n\nFollowing the detection of GRB 230815A by Swift (Klingler et al. GCNC 34434) and Fermi (Mayland et al. GCNC 34440), the BOOTES-6/DPRT 0.6m robotic telescope at Boyden Observatory in Maselspoort (South Africa) automatically observed the GRB location starting on Aug. 15, 19:21 UT (~ 8.5 h after trigger). No new optical source is detected on the co-added image (5 x 60 s, clear filter) within the enhanced Swift/XRT error region (Beardmore et al. GCNC 34437) down to 19.5 mag.\n\nWe thank the staff at Boyden Observatory for their excellent support.\n\n\n---\nTo unsubscribe, open this link in a web browser:\nhttps://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMTM1MDU5LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.Ik_0Q-5voO3uoZZEQdh8ToGm5LKoZR-j_JKF5JawJIE\n\n",
"published": "2023-08-15T21:31:04.815274Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-15T21:31:04.815307Z",
"modified": "2023-08-15T21:31:04.819474Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 2112,
"topic": "gcn.circular",
"uuid": "68895683-4d3e-4448-84f8-f48ca8cecd08",
"title": "GRB 230812B: continued SAO RAS optical observation",
"submitter": "Hop gcn.circular",
"authors": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"data": {
"date": "23/08/16 01:28:09 GMT",
"from": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
"title": "GCN CIRCULAR",
"number": "34442",
"subject": "GRB 230812B: continued SAO RAS optical observation"
},
"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 19:02:23--20:57:14 UT and\n8 x 300 sec. images in B band on 19:45:22--21:08:27 UT (August 15).\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)\nis clearly detected in our stacked frames with the brightness of\nR = 21.40 +/- 0.06 (t_mid - t0 = 3.0428 days),\nB = 22.23 +/- 0.09 (t_mid - t0 = 3.0616 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.eyJlbWFpbCI6ImdjbmNpcmN1bGFyQGRldi5ob3Auc2NpbW1hLm9yZyIsInRvcGljcyI6WyJjaXJjdWxhcnMiXSwiaWF0IjoxNjkyMTQ5Mjk1LCJpc3MiOiJodHRwczovL2djbi5uYXNhLmdvdiJ9.JDExFEQ5pSyWwQkJ7gYafQAIb73B9GYreSp82vW2NvU\n\n",
"published": "2023-08-16T01:28:19.842281Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-08-16T01:28:19.842299Z",
"modified": "2023-08-16T01:28:19.847109Z",
"nonlocalizedevents": [],
"targets": []
},
{
"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": [],
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},
{
"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",
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},
{
"id": 2115,
"topic": "igwn.gwalert",
"uuid": "4b084d4f-e559-4b78-9410-314f727a1131",
"title": "S230816h - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"time": "2023-08-16T06:27:06.375Z",
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"duration": 0.051791,
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"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-16T06:29:14Z",
"superevent_id": "S230816h",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-16T06:29:15.342122Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-16T06:29:15.342144Z",
"modified": "2023-08-16T06:29:15.347326Z",
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},
{
"id": 2116,
"topic": "igwn.gwalert",
"uuid": "b489a15f-774e-47fd-83f2-156e9be13b34",
"title": "S230816h - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"time": "2023-08-16T06:27:06.375Z",
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"sequence_num": 2,
"time_created": "2023-08-16T06:33:48Z",
"superevent_id": "S230816h",
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},
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"published": "2023-08-16T06:33:49.112763Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-16T06:33:49.112785Z",
"modified": "2023-08-16T06:33:49.116334Z",
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},
{
"id": 2117,
"topic": "igwn.gwalert",
"uuid": "faada116-e004-404d-89e5-32c3cceffd95",
"title": "S230816j - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"time": "2023-08-16T06:45:33.063Z",
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"time_created": "2023-08-16T06:46:33Z",
"superevent_id": "S230816j",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-16T06:46:34.044251Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-16T06:46:34.044273Z",
"modified": "2023-08-16T06:46:34.048051Z",
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},
{
"id": 2118,
"topic": "igwn.gwalert",
"uuid": "1c882de0-89da-4d55-a8a7-f6da56f076a2",
"title": "S230816j - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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},
"event": {
"far": 6.55194e-06,
"time": "2023-08-16T06:45:33.010Z",
"group": "Burst",
"search": "AllSky",
"area_50": 2260.0079631423696,
"area_90": 9896.950664330083,
"duration": 0.022623,
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"title": "S230816r - PRELIMINARY",
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"topic": "igwn.gwalert",
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"title": "S230816t - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"time_created": "2023-08-16T08:55:57Z",
"superevent_id": "S230816t",
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"published": "2023-08-16T08:55:58.852774Z",
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{
"id": 2122,
"topic": "igwn.gwalert",
"uuid": "135a53b3-0e0c-4b17-93b3-b6d522797db2",
"title": "S230816t - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"sequence_num": 2,
"time_created": "2023-08-16T09:00:31Z",
"superevent_id": "S230816t",
"external_coinc": null
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"message_text": "",
"published": "2023-08-16T09:00:32.647024Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-16T09:00:32.647046Z",
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{
"id": 2123,
"topic": "hermes.message",
"uuid": "d7864d97-c47e-480a-9fa1-432e1452a5e4",
"title": "INTEGRAL follow-up of S230816t",
"submitter": "Volodymyr Savchenko",
"authors": "",
"data": {},
"message_text": "INTEGRAL follow-up of S230816t at 2023-08-16T08:54:40.000\n\n\nSPI-ACS excesses:\nat T0+43.94 FAP = 0.143\nat T0+-66.43 FAP = 0.35\nat T0+8.82 FAP = 0.513\nat T0+-21.08 FAP = 0.577\nat T0+153.54 FAP = 0.923\nat T0+141.62 FAP = 0.924\n\n\n\n\nnext break in data in 50 hr: 2023-08-18T11:16:02, for about 9 hr",
"published": "2023-08-16T09:12:48.661956Z",
"message_parser": "Hermes Message Parser v2",
"retracted": false,
"created": "2023-08-16T09:12:48.661973Z",
"modified": "2023-08-16T09:12:48.666131Z",
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{
"id": 2124,
"topic": "igwn.gwalert",
"uuid": "c6ffd059-70de-489f-9c3a-0010bdf12aaf",
"title": "S230816v - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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{
"id": 2125,
"topic": "igwn.gwalert",
"uuid": "cee1fc1f-f191-4eb8-8bb0-110e92f26083",
"title": "S230816v - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"time_created": "2023-08-16T10:02:31Z",
"superevent_id": "S230816v",
"external_coinc": null
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"message_text": "",
"published": "2023-08-16T10:02:31.672803Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-16T10:02:31.672823Z",
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{
"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",
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{
"id": 2127,
"topic": "igwn.gwalert",
"uuid": "1a66f911-cdbc-4744-877c-74250e146ab4",
"title": "S230816ac - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"message_text": "",
"published": "2023-08-16T12:11:02.643746Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-16T12:11:02.643766Z",
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{
"id": 2128,
"topic": "igwn.gwalert",
"uuid": "55682fbc-b801-4393-8f1d-85aed8ddc934",
"title": "S230816ac - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"time_created": "2023-08-16T12:15:35Z",
"superevent_id": "S230816ac",
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"message_text": "",
"published": "2023-08-16T12:15:36.398118Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-16T12:15:36.398193Z",
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{
"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",
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{
"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": [],
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},
{
"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": [],
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{
"id": 2132,
"topic": "igwn.gwalert",
"uuid": "54b1f85b-5214-4f28-bac2-c85d76632836",
"title": "S230816af - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"event": {
"far": 1.63689e-05,
"time": "2023-08-16T15:10:40.047Z",
"group": "Burst",
"search": "BBH",
"area_50": 4914.064292711382,
"area_90": 14712.817600551756,
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"skymap_hash": "8ed385705a6a742e842758253b6d7e37",
"classification": {},
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"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-16T15:11:38Z",
"superevent_id": "S230816af",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-16T15:11:40.251264Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-16T15:11:40.251286Z",
"modified": "2023-08-16T15:11:40.256875Z",
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},
{
"id": 2133,
"topic": "igwn.gwalert",
"uuid": "507d3b7c-9ff1-4c1f-9df0-c67b2567d4a1",
"title": "S230816af - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230816af/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230816af/view/"
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"event": {
"far": 1.63689e-05,
"time": "2023-08-16T15:10:40.047Z",
"group": "Burst",
"search": "BBH",
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"sequence_num": 2,
"time_created": "2023-08-16T15:16:12Z",
"superevent_id": "S230816af",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-16T15:16:14.042231Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-16T15:16:14.042253Z",
"modified": "2023-08-16T15:16:14.046038Z",
"nonlocalizedevents": [],
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},
{
"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": [],
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},
{
"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",
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{
"id": 2137,
"topic": "igwn.gwalert",
"uuid": "d968b28a-8011-4762-8b11-76e60b0d0ce5",
"title": "S230816aj - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"time": "2023-08-16T17:30:51.597Z",
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"time_created": "2023-08-16T17:33:02Z",
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"published": "2023-08-16T17:33:04.609763Z",
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{
"id": 2138,
"topic": "igwn.gwalert",
"uuid": "db2a19f8-812d-4da4-81c2-c09ff25954ec",
"title": "S230816aj - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"time_created": "2023-08-16T17:37:37Z",
"superevent_id": "S230816aj",
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"published": "2023-08-16T17:37:38.402962Z",
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{
"id": 2139,
"topic": "igwn.gwalert",
"uuid": "a295da58-091f-4b5a-9ea2-d532a799d21c",
"title": "S230816an - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"time": "2023-08-16T18:01:58.701Z",
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"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "f9f227de85bc71e991f3107adc74f1e8",
"classification": {},
"skymap_version": 0,
"central_frequency": 1135.166382
},
"alert_type": "PRELIMINARY",
"sequence_num": 1,
"time_created": "2023-08-16T18:03:22Z",
"superevent_id": "S230816an",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-16T18:03:23.503051Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-16T18:03:23.503071Z",
"modified": "2023-08-16T18:03:23.506901Z",
"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": 2141,
"topic": "igwn.gwalert",
"uuid": "624fbcfa-c2dd-43cf-9d21-e4d16d749691",
"title": "S230816an - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230816an/files/cwb.multiorder.fits,0",
"gracedb": "https://gracedb.ligo.org/superevents/S230816an/view/"
},
"event": {
"far": 1.63749e-05,
"time": "2023-08-16T18:01:58.701Z",
"group": "Burst",
"search": "AllSky",
"area_50": 1268.1726979140733,
"area_90": 4706.758762344223,
"duration": 0.006557,
"pipeline": "CWB",
"properties": {},
"instruments": [
"H1",
"L1"
],
"significant": false,
"skymap_hash": "f9f227de85bc71e991f3107adc74f1e8",
"classification": {},
"skymap_version": 0,
"central_frequency": 1135.166382
},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-16T18:07:56Z",
"superevent_id": "S230816an",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-16T18:07:57.229242Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-16T18:07:57.229263Z",
"modified": "2023-08-16T18:07:57.232939Z",
"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": 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": 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",
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{
"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",
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{
"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",
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"title": "S230817a - PRELIMINARY",
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"uuid": "704cc700-e251-4b16-ba70-c0fb6a3f85d0",
"title": "S230817a - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
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"published": "2023-08-17T01:58:23.253287Z",
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"retracted": false,
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{
"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",
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"title": "S230817d - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
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"data": {
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"event": {
"far": 5.26616e-06,
"time": "2023-08-17T08:29:39.352Z",
"group": "Burst",
"search": "BBH",
"area_50": 1518.282204187001,
"area_90": 4878.813959612514,
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"time_created": "2023-08-17T08:35:35Z",
"superevent_id": "S230817n",
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},
"message_text": "",
"published": "2023-08-17T08:35:36.461107Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-17T08:35:36.461127Z",
"modified": "2023-08-17T08:35:36.464746Z",
"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": [],
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},
{
"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": 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": 2163,
"topic": "igwn.gwalert",
"uuid": "61f6805e-2a09-4f52-9c11-e6e325aa9509",
"title": "S230817z - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"gracedb": "https://gracedb.ligo.org/superevents/S230817z/view/"
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"event": {
"far": 1.723651745515414e-05,
"time": "2023-08-17T13:47:06.442Z",
"group": "CBC",
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"area_50": 327.16715407387807,
"area_90": 1167.667283900036,
"duration": null,
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"sequence_num": 1,
"time_created": "2023-08-17T13:47:35Z",
"superevent_id": "S230817z",
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},
"message_text": "",
"published": "2023-08-17T13:47:36.360881Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-17T13:47:36.360903Z",
"modified": "2023-08-17T13:47:36.367360Z",
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{
"id": 2164,
"topic": "igwn.gwalert",
"uuid": "53e55d74-a24e-47a1-9425-01192d6f757a",
"title": "S230817z - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230817z/files/bayestar.multiorder.fits,0",
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},
"event": {
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"time": "2023-08-17T13:47:06.442Z",
"group": "CBC",
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"area_90": 1167.667283900036,
"duration": null,
"pipeline": "pycbc",
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},
"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-17T13:52:09Z",
"superevent_id": "S230817z",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-17T13:52:10.075839Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-17T13:52:10.075861Z",
"modified": "2023-08-17T13:52:10.080677Z",
"nonlocalizedevents": [],
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},
{
"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": 2166,
"topic": "igwn.gwalert",
"uuid": "66ce0272-7bcd-4b8b-a860-e5d7a1e0e259",
"title": "S230817ag - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230817ag/files/bayestar.multiorder.fits,0",
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"time": "2023-08-17T16:16:28.075Z",
"group": "CBC",
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"sequence_num": 1,
"time_created": "2023-08-17T16:16:50Z",
"superevent_id": "S230817ag",
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},
"message_text": "",
"published": "2023-08-17T16:16:51.260126Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-17T16:16:51.260149Z",
"modified": "2023-08-17T16:16:51.265800Z",
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},
{
"id": 2167,
"topic": "igwn.gwalert",
"uuid": "78846e27-113d-4066-97e3-cb0bad0631b1",
"title": "S230817ag - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
"skymap": "https://gracedb.ligo.org/api/superevents/S230817ag/files/bayestar.multiorder.fits,0",
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"duration": null,
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"alert_type": "PRELIMINARY",
"sequence_num": 2,
"time_created": "2023-08-17T16:21:25Z",
"superevent_id": "S230817ag",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-17T16:21:26.028371Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-17T16:21:26.028391Z",
"modified": "2023-08-17T16:21:26.032458Z",
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},
{
"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",
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},
{
"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",
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},
{
"id": 2171,
"topic": "igwn.gwalert",
"uuid": "7b110a6e-5865-4aff-974d-03d22f2ae234",
"title": "S230817ao - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"time": "2023-08-17T21:20:04.850Z",
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"time_created": "2023-08-17T21:20:46Z",
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},
"message_text": "",
"published": "2023-08-17T21:20:47.606352Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-17T21:20:47.606374Z",
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},
{
"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",
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"created": "2023-08-17T21:21:23.693933Z",
"modified": "2023-08-17T21:21:23.697797Z",
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{
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"title": "S230817ap - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"time": "2023-08-17T21:23:49.141Z",
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"sequence_num": 1,
"time_created": "2023-08-17T21:24:13Z",
"superevent_id": "S230817ap",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-17T21:24:14.200687Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-17T21:24:14.200732Z",
"modified": "2023-08-17T21:24:14.204540Z",
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},
{
"id": 2174,
"topic": "igwn.gwalert",
"uuid": "19774fc7-d896-459a-8b46-9bf406aa027a",
"title": "S230817ao - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
"urls": {
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"time_created": "2023-08-17T21:25:22Z",
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},
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"published": "2023-08-17T21:25:23.361975Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-17T21:25:23.361996Z",
"modified": "2023-08-17T21:25:23.365857Z",
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{
"id": 2175,
"topic": "igwn.gwalert",
"uuid": "a6657089-18d9-43ee-83e8-baab699e314a",
"title": "S230817ap - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
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"data": {
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"sequence_num": 2,
"time_created": "2023-08-17T21:28:48Z",
"superevent_id": "S230817ap",
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},
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"published": "2023-08-17T21:28:49.996293Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-17T21:28:49.996315Z",
"modified": "2023-08-17T21:28:50.000043Z",
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},
{
"id": 2176,
"topic": "igwn.gwalert",
"uuid": "734c966c-5daa-4db0-93db-0475530642f0",
"title": "S230817aq - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"event": {
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"time": "2023-08-17T23:13:59.754Z",
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"time_created": "2023-08-17T23:15:18Z",
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},
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"published": "2023-08-17T23:15:19.580712Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-17T23:15:19.580734Z",
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{
"id": 2177,
"topic": "igwn.gwalert",
"uuid": "be381c13-e990-4ecb-81c8-46865ce1837c",
"title": "S230817aq - PRELIMINARY",
"submitter": "cody.messick-30d512c8",
"authors": "LVK",
"data": {
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"time_created": "2023-08-17T23:19:54Z",
"superevent_id": "S230817aq",
"external_coinc": null
},
"message_text": "",
"published": "2023-08-17T23:19:55.279984Z",
"message_parser": "IGWN Alert Avro Parser v1",
"retracted": false,
"created": "2023-08-17T23:19:55.280005Z",
"modified": "2023-08-17T23:19:55.283821Z",
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},
{
"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",
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"title": "S230818p - PRELIMINARY",
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"title": "S230818p - PRELIMINARY",
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{
"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",
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"title": "S230818v - PRELIMINARY",
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"topic": "igwn.gwalert",
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"title": "S230818an - PRELIMINARY",
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{
"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",
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{
"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",
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{
"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": []
}
]
}
