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{
"id": 5259,
"topic": "gcn.circular",
"uuid": "c2fddcee-68ed-4ee1-9f4e-c3b8a1644255",
"title": "GRB231205B: Swift/UVOT Upper Limits",
"submitter": "Hop gcn.circular",
"authors": "Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>",
"data": {
"date": "23/12/08 17:38:53 GMT",
"from": "Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35308"
},
"title": "GCN CIRCULAR",
"number": "35308",
"subject": "GRB231205B: Swift/UVOT Upper Limits"
},
"message_text": "M. H. Siegel (PSU) and P. A. Evans (U. Leicester)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 231205B\n216 s after the BAT trigger (Evans et al., GCN Circ. 35269).\nNo optical afterglow consistent with the XRT position\n(Osborne et al. 35275) is detected in the initial UVOT exposures.\nPreliminary 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first\nfinding chart (FC) exposure and subsequent exposures are:\n\nFilter T_start(s) T_stop(s) Exp(s) Mag\n\nwhite_FC 237 387 147 >21.3\nwhite 237 536 167 >21.3\nv 216 414 33 >18.6\nb 492 512 19 >19.6\nu 468 487 19 >18.2\nw1 443 463 19 >19.3\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.204 in the direction of the burst\n(Schlegel et al. 1998).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35308.",
"published": "2023-12-08T17:39:06.462083Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-08T17:39:06.462101Z",
"modified": "2023-12-08T17:39:06.470914Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5260,
"topic": "gcn.circular",
"uuid": "b5a6c41f-046d-40fa-80d7-1be506917462",
"title": "GRB 231208A: GRBAlpha detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "23/12/10 10:53:52 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35309"
},
"title": "GCN CIRCULAR",
"number": "35309",
"subject": "GRB 231208A: GRBAlpha detection"
},
"message_text": "M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, M. Kolar, L. Szakszonova, J.-P. Breuer, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration.\n\nThe long-duration GRB 231208A (AstroSat detection: GCN 35306; Glowbug detection: GCN 35307; Konus/Wind trigger at 2023-12-08 02:29:45.527 UT) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023, A&A, 677, 40; arXiv:2302.10048).\n\nThe detection was confirmed at the peak time 2023-12-08 02:29:46 UTC. The T90 duration measured by GRBAlpha is 3 s and the overall significance during T90 reaches 5 sigma.\n\nThe light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB231208A_GCN.pdf\n\nAll GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/hea/GRBAlpha/ \nGRBAlpha, launched on 2021 March 22, is a demonstration mission for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~50 keV to ~1000 keV. To increase the duty cycle and the downlink rate, the upgrade of the on-board data acquisition software stack is in progress. The ground segment is also supported by the radio amateur community and it takes advantage of the SatNOGS network for increased data downlink volume. \n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35309.",
"published": "2023-12-10T10:54:11.783443Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-10T10:54:11.783468Z",
"modified": "2023-12-10T10:54:11.793502Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5261,
"topic": "gcn.circular",
"uuid": "27079fcc-560c-4322-bba0-32d7bc6a5be3",
"title": "GRB 231210A: 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": "23/12/10 13:26:23 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35310"
},
"title": "GCN CIRCULAR",
"number": "35310",
"subject": "GRB 231210A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely SHORT GRB\n\nAt 13:15:50 UT on 10 Dec 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231210A (trigger 723906955.510584 / 231210553).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 137.9, Dec = 10.3 (J2000 degrees, equivalent to J2000 09h 11m, 10d 18'), with a statistical uncertainty of 14.4 degrees.\n\nThe angle from the Fermi LAT boresight is 44.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231210553/quicklook/glg_skymap_all_bn231210553.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/bn231210553/quicklook/glg_healpix_all_bn231210553.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231210553/quicklook/glg_lc_medres34_bn231210553.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35310.",
"published": "2023-12-10T13:26:35.113542Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-10T13:26:35.113565Z",
"modified": "2023-12-10T13:26:35.122288Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5262,
"topic": "gcn.circular",
"uuid": "d5add41d-d8af-4429-a972-2ca58ff84d35",
"title": "IPN triangulation of GRB 231129C",
"submitter": "Hop gcn.circular",
"authors": "Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>",
"data": {
"date": "23/12/10 19:03:56 GMT",
"from": "Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35311"
},
"title": "GCN CIRCULAR",
"number": "35311",
"subject": "IPN triangulation of GRB 231129C"
},
"message_text": "A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin\non behalf of the MGNS/BepiColombo and HEND/Mars Odyssey teams,\n\nJ. Benkhoff on behalf of the BepiColombo team,\n\nD. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko,\nand T. Cline on behalf of the Konus-Wind team,\n\nA. Goldstein, M. S. Briggs, C. Wilson-Hodge,\nand E. Burns on behalf of the Fermi GBM 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 very bright, long-duration GRB 231129C\n(Fermi-GBM detection: The Fermi GBM team, GCN Circ. 35217;\nSharma et al., GCN Circ. 35221, 35227;\nBALROG localization: Preis et al., GCN Circ. 35222;\nMAXI-GSC detection: Kawakubo et al., GCN Circ. 35223;\nCALET-CGBM detection: Shimizu et al., GCN Circ. 35228;\nAstroSat-CZTI detection: Waratkar et al., GCN Circ. 35230;\nGECAM-B detection: Zheng and Xiong, GCN Circ. 35231;\nGlowbug detection: Cheung et al., GCN Circ. 35235;\nGRBAlpha detection: Dafcikova et al., GCN Circ. 35236;\nFermi-LAT detection: Arimoto et al., GCN Circ. 35238;\nSwift-BAT/GUANO detection: DeLaunay et al., GCN Circ. 35242;\nAGILE detection: Panebianco et al., GCN Circ. 35244;\nKonus-Wind detection: Lysenko et al., GCN Circ. 35256;\nASIM-MXGS detection: Marisaldi et al., GCN Circ. 35288)\nwas detected by Fermi (GBM, LAT), ISS (Glowbug, CALET-CGBM),\nAstroSat (CZTI), GECAM-B (GRD), GRBAlpha, AGILE (MCAL, AC),\nSwift (BAT), Konus-Wind, INTEGRAL (SPI-ACS),\nGRBAlpha, Mars-Odyssey (HEND), and BebiColombo (MGNS)\nat about 69018 s UT (19:10:18).\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 9.975 (00h 39m 54s) -81.812 (-81d 48' 43\")\n Corners:\n 4.821 (00h 19m 17s) -80.799 (-80d 47' 56\")\n 16.263 (01h 05m 03s) -82.675 (-82d 40' 29\")\n 16.443 (01h 05m 46s) -82.746 (-82d 44' 45\")\n 4.881 (00h 19m 31s) -80.873 (-80d 52' 23\")\n ---------------------------------------------\nThe error box area is 322 sq. arcmin, and its maximum\ndimension is 2.5 deg (the minimum one is 2.2 arcmin).\nThe Sun distance was 73 deg.\n\nThis localization may be improved.\n\nThe IPN localization is consistent with, but reduces the area of,\nthe Fermi-GBM/LAT and ASIM localizations.\n\nThe Swift-XRT reported Source 2 (GCN 35234, 35251) is inside the IPN box, supporting that the source is the afterglow of GRB 231129C.\n\nA triangulation map and HEALPix FITS file are posted at\nhttp://www.ioffe.ru/LEA/GRBs/GRB231129_T69016/IPN/\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35311.",
"published": "2023-12-10T19:04:12.529725Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-10T19:04:12.529740Z",
"modified": "2023-12-10T19:04:12.536843Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5263,
"topic": "gcn.circular",
"uuid": "d9a81908-5186-4857-b403-ce1bdcfb482e",
"title": "Swift GRB231210.90: 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": "23/12/10 21:38:56 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35312"
},
"title": "GCN CIRCULAR",
"number": "35312",
"subject": "Swift GRB231210.90: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-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 GRB231210.90 (trigger No 1201696,06h 23m 05.28s , -48d 21m 32.4s, R=0.05) errorbox 89 sec after notice time and 124 sec after trigger time at 2023-12-10 21:31:08 UT, with upper limit up to 18.9 mag. The observations began at zenith distance = 30 deg. The sun altitude is -33.2 deg.\n\nThe galactic latitude b = -24 deg., longitude l = 257 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#29146\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 129 | MASTER-SAAO | P\\\\ | 10 | 17.4 |\n 129 | MASTER-SAAO | P/ | 10 | 17.3 |\n 213 | MASTER-SAAO | P\\\\ | 40 | 18.5 |\n 213 | MASTER-SAAO | P/ | 40 | 18.4 |\n 283 | MASTER-SAAO | P\\\\ | 50 | 18.9 |\n 283 | MASTER-SAAO | P/ | 50 | 18.9 |\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35312.",
"published": "2023-12-10T21:39:07.264657Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-10T21:39:07.264674Z",
"modified": "2023-12-10T21:39:07.272227Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5290,
"topic": "gcn.circular",
"uuid": "b753eb91-3a8d-4e57-a927-bc3758433c39",
"title": "LIGO/Virgo/KAGRA S231213ap: Identification of a GW compact binary merger candidate",
"submitter": "Hop gcn.circular",
"authors": "Lorenzo Mirasola at Università di Cagliari/INFN Cagliari <lorenzo.mirasola@ca.infn.it>",
"data": {
"date": "23/12/13 16:00:09 GMT",
"from": "Lorenzo Mirasola at Università di Cagliari/INFN Cagliari <lorenzo.mirasola@ca.infn.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35330"
},
"title": "GCN CIRCULAR",
"number": "35330",
"subject": "LIGO/Virgo/KAGRA S231213ap: Identification of a GW compact binary merger candidate"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe identified the compact binary merger candidate S231213ap during real-time processing of data from LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) at 2023-12-13 11:14:17.914 UTC (GPS time: 1386501275.914). The candidate was found by the CWB [1], GstLAL [2], MBTA [3], PyCBC Live [4], and SPIIR [5] analysis pipelines.\n\nS231213ap is an event of interest because its false alarm rate, as estimated by the online analysis, is 6.3e-10 Hz, or about one in 50 years. The event's properties can be found at this URL:\n\nhttps://gracedb.ligo.org/superevents/S231213ap\n\nThe classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), BNS (<1%), or NSBH (<1%).\nAfter parameter estimation by RapidPE-RIFT [6], the updated classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS (0%).\n\nAssuming the candidate is astrophysical in origin, the probability that the lighter compact object is consistent with a neutron star mass (HasNS) is <1%. [7] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [7] Both HasNS and HasRemnant consider the support of several neutron star equations of state. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassgap) is <1%.\n\nTwo sky maps are available at this time and can be retrieved from the GraceDB event page:\n * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [8], distributed via GCN notice about 40 seconds after the candidate event time.\n * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [8], distributed via GCN notice about 5 minutes after the candidate event time.\n\nThe preferred sky map at this time is bayestar.multiorder.fits,1. For the bayestar.multiorder.fits,1 sky map, the 90% credible region is 2106 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 2863 +/- 856 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/userguide/.\n\n [1] Klimenko et al. PRD 93, 042004 (2016)\n [2] Tsukada et al. PRD 108, 043004 (2023) and Ewing et al. arXiv:2305.05625 (2023)\n [3] Aubin et al. CQG 38, 095004 (2021)\n [4] Dal Canton et al. ApJ 923, 254 (2021)\n [5] Chu et al. PRD 105, 024023 (2022)\n [6] Rose et al. arXiv:2201.05263 (2022) and Pankow et al. PRD 92, 023002 (2015)\n [7] Chatterjee et al. ApJ 896, 54 (2020)\n [8] Singer & Price PRD 93, 024013 (2016)\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35330.",
"published": "2023-12-13T16:01:00.602415Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-13T16:01:00.602434Z",
"modified": "2023-12-13T16:01:00.665871Z",
"nonlocalizedevents": [
{
"event_id": "S231213a"
}
],
"targets": []
},
{
"id": 5264,
"topic": "gcn.circular",
"uuid": "87fabc9e-815b-4e96-8969-9f87831777d9",
"title": "Swift GRB231210.90: Global MASTER-Net OT detection",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/12/10 21:42:31 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35313"
},
"title": "GCN CIRCULAR",
"number": "35313",
"subject": "Swift GRB231210.90: Global MASTER-Net OT detection"
},
"message_text": "D. Buckley\n(South African Astronomical Observatory),\n\nV. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-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 GRB231210.90 92 sec after notice time and 124 sec after trigger time at 2023-12-10 21:31:08 UT. On our first (10s exposure) set we found 1 optical transient within Swift error-box (ra.7708 dec=-48.3583 r=0.05) brighter than 16.9.\n\n\n T-Tmid Date Time Expt. Ra Dec Mag\n---------|---------------------|-------|-----------------|-----------------|-------\n 129 2023-12-10 21:31:08 10 (06h 23m 11.01s , -48d 22m 20.5s) 16.3\n\nThe 5-sigma upper limit has been about 16.9mag\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35313.",
"published": "2023-12-10T21:42:39.557097Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-10T21:42:39.557111Z",
"modified": "2023-12-10T21:42:39.562016Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5265,
"topic": "gcn.circular",
"uuid": "ebb0fa38-c8aa-41e0-b2db-dd5a9afe74b0",
"title": "GRB 231210B: Swift detection of a burst with optical counterpart",
"submitter": "Hop gcn.circular",
"authors": "Jamie Kennea at Penn State <jak51@psu.edu>",
"data": {
"date": "23/12/10 21:49:47 GMT",
"from": "Jamie Kennea at Penn State <jak51@psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35314"
},
"title": "GCN CIRCULAR",
"number": "35314",
"subject": "GRB 231210B: Swift detection of a burst with optical counterpart"
},
"message_text": "\nK. L. Page (U Leicester), J.D. Gropp (PSU), J. A. Kennea (PSU),\nD. M. Palmer (LANL), T. M. Parsotan (GSFC/UMBC/CRESSTII) and\nM. A. Williams (PSU) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nAt 21:29:04 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 231210B (trigger\u001201696). Swift slewed immediately to the burst.\nThe BAT on-board calculated location is\nRA, Dec 95.772, -48.359 which is\n RA(J2000) = 06h 23m 05s\n Dec(J2000) = -48d 21' 32\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including\nsystematic uncertainty). The BAT light curve showed a complex\nstructure with a duration of about 15 sec. However, since this\nGRB occurred while the spacecraft was leaving the SAA, the rate\nlightcurve is hard to interpret. The peak count rate\nwas ~1500 counts/sec (15-350 keV), at ~T+0 sec after the trigger.\n\nThe XRT began observing the field at 21:31:07.8 UT, 123.4 seconds after\nthe BAT trigger. Using promptly downlinked data we find a bright,\nuncatalogued X-ray source with an enhanced position: RA, Dec 95.79386,\n-48.37201 which is equivalent to:\n RA(J2000) = 06h 23m 10.53s\n Dec(J2000) = -48d 22' 19.2\"\nwith an uncertainty of 1.9 arcseconds (radius, 90% containment). This\nlocation is 70 arcseconds from the BAT onboard position, within the BAT\nerror circle. This position may be improved as more data are received;\nthe latest position is available at https://www.swift.ac.uk/sper. No\nspectrum from the promptly downlinked event data is yet available to\ndetermine the column density.\n\nThe initial flux in the 2.5 s image was 4.31e-10 erg cm^-2 s^-1 (0.2-10\nkeV).\n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 462 seconds after the BAT trigger. Due to tracking issues, the\nUVOT image is blurred. However, comparison with DSS shows that there appears\nto be a new source coincident with the XRT localization. Further data and\nanalysis will be needed to report an accurate localization and magnitude\nof this object.\n\nBurst Advocate for this burst is K. L. Page (klp5 AT leicester.ac.uk).\nPlease contact the BA by email if you require additional information\nregarding Swift followup of this burst. In extremely urgent cases, after\ntrying the Burst Advocate, you can contact the Swift PI by phone (see\nSwift TOO web site for information: http://www.swift.psu.edu/)\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35314.",
"published": "2023-12-10T21:49:57.293263Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-10T21:49:57.293278Z",
"modified": "2023-12-10T21:49:57.299442Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5266,
"topic": "gcn.circular",
"uuid": "6c3a49b9-b822-489f-93f8-74bb2fe135ea",
"title": "Fermi trigger No 723906955: 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": "23/12/10 23:16:20 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35315"
},
"title": "GCN CIRCULAR",
"number": "35315",
"subject": "Fermi trigger No 723906955: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB231210.55 (trigger No 723906955,09h 11m 38.40s , +10d 20m 24.0s, R\u0014.38) errorbox 26943 sec after notice time and 27055 sec after trigger time at 2023-12-10 20:46:45 UT, with upper limit up to 19.6 mag. The observations began at zenith distance = 57 deg. The sun altitude is -69.6 deg.\n\nMASTER-SAAO robotic telescope located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB231210.55 errorbox 29290 sec after notice time and 29401 sec after trigger time at 2023-12-10 21:25:51 UT, with upper limit up to 19.2 mag. The observations began at zenith distance = 79 deg. The sun altitude is -32.9 deg.\n\nThe galactic latitude b = 36 deg., longitude l = 220 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#28937\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 27145 | 2023-12-10 20:46:45 | MASTER-Kislovodsk | (08h 59m 31.68s , +18d 04m 42.0s) | C | 180 | 19.2 |\n 27346 | 2023-12-10 20:50:06 | MASTER-Kislovodsk | (09h 07m 50.50s , +18d 03m 47.1s) | C | 180 | 19.5 |\n 28358 | 2023-12-10 21:06:58 | MASTER-Kislovodsk | (08h 59m 28.83s , +18d 05m 01.2s) | C | 180 | 19.6 |\n 28559 | 2023-12-10 21:10:19 | MASTER-Kislovodsk | (09h 07m 54.64s , +18d 03m 27.1s) | C | 180 | 19.3 |\n 29491 | 2023-12-10 21:25:51 | MASTER-SAAO | (09h 11m 03.56s , +00d 13m 21.3s) | C | 180 | 19.2 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35315.",
"published": "2023-12-10T23:16:30.904484Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-10T23:16:30.904499Z",
"modified": "2023-12-10T23:16:30.912710Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5268,
"topic": "gcn.circular",
"uuid": "075efd26-62f7-4217-9580-d9b68fc71dfe",
"title": "GRB 231210B: detection of the optical counterpart with the LCOGT 40cm telescope at Sutherland Observatory",
"submitter": "Hop gcn.circular",
"authors": "Ismael Perez-Fournon at Instituto de Astrofisica de Canarias <ipf@iac.es>",
"data": {
"date": "23/12/11 01:12:12 GMT",
"from": "Ismael Perez-Fournon at Instituto de Astrofisica de Canarias <ipf@iac.es>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35316"
},
"title": "GCN CIRCULAR",
"number": "35316",
"subject": "GRB 231210B: detection of the optical counterpart with the LCOGT 40cm telescope at Sutherland Observatory"
},
"message_text": "I. Pérez-Fournon, F. Poidevin (IAC and ULL), H. Akoudad-Ekajouan, C. Araujo-Ãlvarez, C. Arrizabalaga-DÃaz-Caneja, F. Barnes-Sánchez, P. Eguiguren-Arrizabalaga, A. Iglesias-López, G.A. Jaimes-Illanes, P. Jiménez-Sánchez, S. Lamolda-Mir, A. Mang-Román, G. Marrero-Ramallo, P.P. Meni-Gallardo, I. Ruiz-Cejudo (ULL), M. Sánchez-Andújar (ULL and IAC), V. Wienzek (ULL), E. Esparza-Borges, and F. Tinaut-Ruano (IAC and ULL)\n\nreport observations of GRB 231210B with the LCOGT 40cm telescope at Sutherland Observatory starting on 2023-12-10 22:22:25 UT in the SDSS g', r', and i' filters.\n\nWe detect a source in the three filters at the position RA (J2000) = 06h 23m 10.997s, Dec (J2000) = -48d 22m 19.87s, that is close to the Swift position reported by Page et al. (GCN 35314) and the optical transient reported by Buckley et al. (GCN 35313).\n\nWe measure the following magnitudes:\n\n Date Time Filter Exposure (sec) Mag Error\n---------------------|-----------|---------------------|------------|-------\n2023-12-10 22:22:25 g 180 20.72 0.18 \n2023-12-10 22:25:34 r 180 19.69 0.12\n2023-12-10 22:28:42 i 180 19.62 0.26\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35316.",
"published": "2023-12-11T01:12:24.590957Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-11T01:12:24.590974Z",
"modified": "2023-12-11T01:12:24.598876Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5269,
"topic": "gcn.circular",
"uuid": "09e85756-6486-42f1-8707-4d608f4327d3",
"title": "GRB 231210B: VLT/X-shooter redshift",
"submitter": "Hop gcn.circular",
"authors": "Andrea Saccardi at Observatoire de Paris <andrea.saccardi@obspm.fr>",
"data": {
"date": "23/12/11 04:42:22 GMT",
"from": "Andrea Saccardi at Observatoire de Paris <andrea.saccardi@obspm.fr>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35317"
},
"title": "GCN CIRCULAR",
"number": "35317",
"subject": "GRB 231210B: VLT/X-shooter redshift"
},
"message_text": "A. Saccardi (GEPI, Observatoire de Paris), B. Schneider (MIT), L. Izzo (INAF-Naples & DARK/NBI), D. B. Malesani (DAWN/NBI), C. Peña (Univ. of Utah) report on behalf of the Stargate collaboration:\n\nWe observed the field of the Swift GRB 231210B (Page et al., GCN 35314) using the ESO/VLT/UT3 (Melipal) equipped with the X-shooter spectrograph. Our spectra cover the wavelength range 3000-21000 AA, and consist of 4 exposures of 600s each. The observation starting-time is 01:32:26 UT on Dec 11 2023 (~4 hr after the Swift trigger).\n\nIn images taken with the acquisition camera, we clearly detect the optical afterglow consistent with the position reported by Buckley et al., GCN 35313 and Pérez-Fournon et al., GCN 35316. We measure the following AB magnitudes (calibrated against SkyMapper stars): g' = 21.82 +/- 0.05 mag, r' = 21.23 +/- 0.04 mag, z' = 21.03 +/- 0.07 mag.\n\nWe detect a continuum over the entire wavelength range. From the detection of a broad Lya absorption at ~5000 AA and multiple absorption features, which we interpret as being due to NV, SiII, SII, OI, CII, ZnII, FeII, AlII, CIV, SiIV, FeII*, OI*, SiII*, CII*, we infer a common redshift of z = 3.13. We conclude this is the redshift of the burst. We also note the presence of additional absorption features likely due to multiple intervening systems.\n\nWe acknowledge the excellent support from the ESO staff in Paranal, in particular Maria Jose Rain, Zahed Wahhaj and Thomas Seifert.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35317.",
"published": "2023-12-11T04:42:32.646925Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-11T04:42:32.646941Z",
"modified": "2023-12-11T04:42:32.654483Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5270,
"topic": "gcn.circular",
"uuid": "8e3332be-6eae-4dd5-8fe4-1705881bfe66",
"title": "GRB 231210B: Enhanced Swift-XRT position",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/12/11 07:16:25 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35318"
},
"title": "GCN CIRCULAR",
"number": "35318",
"subject": "GRB 231210B: 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 1563 s of XRT Photon Counting mode data and 1 UVOT\nimages for GRB 231210B, 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 = 95.79470, -48.37226 which is equivalent\nto:\n\nRA (J2000): 06h 23m 10.73s\nDec (J2000): -48d 22' 20.2\"\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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35318.",
"published": "2023-12-11T07:16:37.528774Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-11T07:16:37.528791Z",
"modified": "2023-12-11T07:16:37.536184Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5294,
"topic": "gcn.circular",
"uuid": "82f6d0f6-2911-4f13-9764-7ee5f37489ef",
"title": "GRB 231210B: REM optical/NIR upper limits",
"submitter": "Hop gcn.circular",
"authors": "Matteo Ferro <matteo.ferro@inaf.it>",
"data": {
"date": "23/12/14 12:04:18 GMT",
"from": "Matteo Ferro <matteo.ferro@inaf.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35333"
},
"title": "GCN CIRCULAR",
"number": "35333",
"subject": "GRB 231210B: REM optical/NIR upper limits"
},
"message_text": "M. Ferro, R. Brivio, P. D'Avanzo, S. Covino, D. Fugazza (INAF-OAB) on behalf of the REM team, report:\n\nWe observed the field of GRB 231210B (Page et al., GCN 35314) with the REM 60cm robotic telescope located at the ESO Observatory of La Silla (Chile). The observations were carried out in the g,r,i,z, J,H,K bands, starting on 2023 Dec 11 at 00:36:37 UT (i.e. about 3.13 hours after the Swift trigger) and lasted for about 1 hour.\nFrom preliminary analysis, we do not find any source at the enhanced XRT position (Beardmore et al., GCN 35318), down the the following 3 sigma upper limits:\n\nr > 21.0 (AB; calibrated against the SkyMapper catalogue)\nat a mid time of t-t0 ~ 3.80 h after the GRB trigger;\n\nH > 17.4 (Vega; calibrated against the 2MASS catalogue)\nat a mid time of t-t0 ~ 3.56 h after the GRB trigger.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35333.",
"published": "2023-12-14T12:04:30.881621Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-14T12:04:30.881637Z",
"modified": "2023-12-14T12:04:30.889137Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5271,
"topic": "gcn.circular",
"uuid": "9edb379d-6453-430b-8700-18b414672414",
"title": "GRB 231210B: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/12/11 10:23:58 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35319"
},
"title": "GCN CIRCULAR",
"number": "35319",
"subject": "GRB 231210B: Swift-XRT refined Analysis"
},
"message_text": "J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), M. Capalbi\n(INAF-IASFPA), M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC & INAF-OAR),\nJ.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), D.N. Burrows (PSU) and\nP.A. Evans report on behalf of the Swift-XRT team:\n\nWe have analysed 6.4 ks of XRT data for GRB 231210B, from 410 s to 35.6\nks after the BAT trigger. The data comprise 40 s in Windowed Timing\n(WT) mode with the remainder in Photon Counting (PC) mode.\n\nThe light curve can be modelled with a power-law decay with a decay\nindex of alpha=1.32 (+0.05, -0.04).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 1.65 (+0.11, -0.10). The\nbest-fitting absorption column is 5.3 (+7.7, -5.3) x 10^21 cm^-2, at a\nredshift of 3.13, in addition to the Galactic value of 4.1 x 10^20\ncm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed)\n0.3-10 keV flux conversion factor deduced from this spectrum is 4.0 x\n10^-11 (4.3 x 10^-11) erg cm^-2 count^-1.\n\nA summary of the PC-mode spectrum is thus:\nGalactic foreground: 4.1 x 10^20 cm^-2\nIntrinsic column: 5.3 (+7.7, -5.3) x 10^21 cm^-2 at z=3.13\nPhoton index:\t 1.65 (+0.11, -0.10)\n\nIf the light curve continues to decay with a power-law decay index of\n1.32, the count rate at T+24 hours will be 4.5 x 10^-3 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.8 x\n10^-13 (1.9 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/01201696.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35319.",
"published": "2023-12-11T10:24:09.814151Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-11T10:24:09.814168Z",
"modified": "2023-12-11T10:24:09.821745Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5272,
"topic": "gcn.circular",
"uuid": "6ab49609-8a04-4f8a-8e5c-1b399c07bc4c",
"title": "IceCube-231202A: No candidates from the Zwicky Transient Facility",
"submitter": "Hop gcn.circular",
"authors": "Sven Weimann <sweimann93@gmail.com>",
"data": {
"date": "23/12/11 15:36:21 GMT",
"from": "Sven Weimann <sweimann93@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35320"
},
"title": "GCN CIRCULAR",
"number": "35320",
"subject": "IceCube-231202A: No candidates from the Zwicky Transient Facility"
},
"message_text": "Sven Weimann (Ruhr University Bochum), Jannis Necker (DESY), Simeon Reusch (DESY), Robert Stein (Caltech), Anna Franckowiak (DESY/Ruhr University Bochum) report:\n\nOn behalf of the Zwicky Transient Facility (ZTF) and Global Relay of Observatories Watching Transients Happen (GROWTH) collaborations:\n\nAs part of the ZTF neutrino follow up program (Stein et al. 2023), we observed the localization region of the neutrino event IceCube-231202A (Sommani et. al, GCN 35255) with the Palomar 48-inch telescope, equipped with the 47 square degree ZTF camera (Bellm et al. 2019, Graham et al. 2019). We started observations in the g- and r-band beginning at 2023-12-08 08:37 UTC, approximately 135.5 hours after event time. We covered 79.8% (6.3 sq deg) of the reported localization region. This estimate accounts for chip gaps. Each exposure was 30s with a typical depth of 21.0 mag.\n\nThe images were processed in real-time through the ZTF reduction and image subtraction pipelines at IPAC to search for potential counterparts (Masci et al. 2019). AMPEL (Nordin et al. 2019, Stein et al. 2021) was used to search the alerts database for candidates. We reject stellar sources (Tachibana and Miller 2018) and moving objects, and apply machine learning algorithms (Mahabal et al. 2019).\n\nNo candidate counterparts were detected.\n\nZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC, USA; WIS, Israel; OKC, Sweden; JSI/UMd, USA; DESY, Germany; TANGO, Taiwan; UW Milwaukee, USA; LANL, USA; TCD, Ireland; IN2P3, France.\n\nGROWTH acknowledges generous support of the NSF under PIRE Grant No 1545949.\nAlert distribution service provided by DIRAC@UW (Patterson et al. 2019).\nAlert database searches are done by AMPEL (Nordin et al. 2019).\nAlert filtering is performed with the nuztf (Stein et al. 2021, https://github.com/desy-multimessenger/nuztf ).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35320.",
"published": "2023-12-11T15:36:37.562699Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-11T15:36:37.562715Z",
"modified": "2023-12-11T15:36:37.570350Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5273,
"topic": "gcn.circular",
"uuid": "aef28643-2cd7-458e-8c14-0243c82fed02",
"title": "IceCube Alert 231211.03: 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": "23/12/11 15:39:38 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35321"
},
"title": "GCN CIRCULAR",
"number": "35321",
"subject": "IceCube Alert 231211.03: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the IceCube Alert 231211.03 (trigger No 4054005,20h 50m 27.12s , +10d 03m 10.8s, R=0.51) errorbox 49886 sec after notice time and 49930 sec after trigger time at 2023-12-11 14:39:42 UT, with upper limit up to 16.8 mag. Observations started at twilight. The observations began at zenith distance = 41 deg. The sun altitude is -11.3 deg.\n\nThe galactic latitude b = -21 deg., longitude l = 57 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#29233\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 50021 | 2023-12-11 14:39:42 | MASTER-Kislovodsk | (20h 50m 45.88s , +10d 30m 00.6s) | C | 180 | 16.8 |\n 50162 | 2023-12-11 14:43:03 | MASTER-Kislovodsk | (20h 49m 14.40s , +11d 07m 58.1s) | C | 60 | 16.2 |\n 50242 | 2023-12-11 14:44:24 | MASTER-Kislovodsk | (20h 57m 18.96s , +11d 09m 47.1s) | C | 60 | 16.1 |\n 51196 | 2023-12-11 14:59:17 | MASTER-Kislovodsk | (20h 50m 45.01s , +10d 29m 41.5s) | C | 180 | 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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35321.",
"published": "2023-12-11T15:39:46.004008Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-11T15:39:46.004025Z",
"modified": "2023-12-11T15:39:46.018526Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5274,
"topic": "gcn.circular",
"uuid": "8f86599c-35f6-44a1-9db4-9337f822eafb",
"title": "GRB 231210B: Swift-BAT refined analysis",
"submitter": "Hop gcn.circular",
"authors": "Mike Moss at NASA GSFC <mikejmoss3@gmail.com>",
"data": {
"date": "23/12/11 21:10:59 GMT",
"from": "Mike Moss at NASA GSFC <mikejmoss3@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35322"
},
"title": "GCN CIRCULAR",
"number": "35322",
"subject": "GRB 231210B: Swift-BAT refined analysis"
},
"message_text": "T. Sakamoto (AGU), S. D. Barthelmy (GSFC),\nH. A. Krimm (NSF), S. Laha (GSFC/UMBC),\nA. Y. Lien (U Tampa), C. B. Markwardt (GSFC),\nD. M. Palmer (LANL), K. L. Page (U Leicester)\nT. Parsotan (GSFC/UMBC), M. Stamatikos (OSU)\n(i.e. the Swift-BAT team):\n\nUsing the data set from T-36 to T+963 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 231210B (trigger #1201696)\n(Page, et al., GCN Circ. 35314). The BAT ground-calculated position is\nRA, Dec = 95.803, -48.335 deg which is\n RA(J2000) = 06h 23m 12.7s\n Dec(J2000) = -48d 20' 04.6\"\nwith an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 17%.\n\nThe mask-weighted light curve shows a FRED pulse potentially followed by a dimmer spike.\nT90 (15-350 keV) is 7.47 +- 0.65 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-0.23 to T+7.82 sec is best fit by a simple\npower-law model. The power law index of the time-averaged spectrum is\n1.08 +- 0.19. The fluence in the 15-150 keV band is 1.4 +- 0.2 x 10^-06 erg/cm2.\nThe 1-sec peak photon flux measured from T-0.24 sec in the 15-150 keV band\nis 3.9 +- 0.7 ph/cm2/sec. All the quoted errors are at the 90% confidence\nlevel.\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/1201696/BA/\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35322.",
"published": "2023-12-11T21:11:09.385287Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-11T21:11:09.385305Z",
"modified": "2023-12-11T21:11:09.394163Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5275,
"topic": "gcn.circular",
"uuid": "d563c2a6-336c-4f0c-8960-cabbf959b3f9",
"title": "GRB 231210B: MeerLICHT afterglow observations",
"submitter": "Hop gcn.circular",
"authors": "Simon de Wet at University of Cape Town <simdewet@gmail.com>",
"data": {
"date": "23/12/11 21:11:37 GMT",
"from": "Simon de Wet at University of Cape Town <simdewet@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35323"
},
"title": "GCN CIRCULAR",
"number": "35323",
"subject": "GRB 231210B: MeerLICHT afterglow observations"
},
"message_text": "S. de Wet (UCT), P.M. Vreeswijk (Radboud) and P.J. Groot (Radboud/UCT/SAAO) report on behalf of the MeerLICHT consortium:\n\nThe 0.6 m wide-field MeerLICHT optical telescope located in Sutherland, South Africa, obtained a repeated series of 60 s exposures in the q,u,g,r,i,z bands of GRB 231210B following the Swift detection (Page et al., GCN 35314). Observations started at 21:32:26 UT on 2023 November 18 (202 seconds post-trigger) and continued for a further 1.79 hours, following the filter sequence quqgqrqiqz. \n\nWe detect the optical afterglow also detected by MASTER, UVOT, LCOGT, and the VLT (Buckley et al., GCN 35313; Page et al., GCN 35314; Pérez-Fournon et al., GCN 35316; Saccardi et al., GCN 35317) with the following AB magnitudes:\n\nq = 17.15 +/- 0.02 at 21:32:57 UT\nu = 19.67 +/- 0.19 at 21:34:20 UT\ng = 18.69 +/- 0.04 at 21:37:17 UT\nr = 18.11 +/- 0.03 at 21:40:11 UT\ni = 18.15 +/- 0.05 at 21:43:08 UT\nz = 18.30 +/- 0.11 at 21:46:05 UT\n\nAs a precaution, we note that the absolute photometric calibration may have been adversely affected by condensation in the cryostat window due to high humidity. Our high cadence q-band observations show a power-law decline with a temporal index of -1.2 throughout the observations. \n\nMeerLICHT is built and run by a consortium consisting of Radboud University, University of Cape Town, the South African Astronomical Observatory, the University of Oxford, the University of Manchester and the University of Amsterdam. \n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35323.",
"published": "2023-12-11T21:11:44.443397Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-11T21:11:44.443418Z",
"modified": "2023-12-11T21:11:44.448654Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5276,
"topic": "gcn.circular",
"uuid": "fd063076-5ad1-4f3c-bc28-3a479326bd66",
"title": "Fermi trigger No 724035412: 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": "23/12/12 01:31:31 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35324"
},
"title": "GCN CIRCULAR",
"number": "35324",
"subject": "Fermi trigger No 724035412: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB231212.04 (trigger No 724035412,12h 22m 50.40s , -70d 00m 00.0s, R=2.62) errorbox 51 sec after notice time and 86 sec after trigger time at 2023-12-12 00:58:14 UT, with upper limit up to 16.4 mag. The observations began at zenith distance = 54 deg. The sun altitude is -24.8 deg.\n\nThe galactic latitude b = -8 deg., longitude l = 301 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#29859\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 97 | 2023-12-12 00:58:14 | MASTER-SAAO | (12h 32m 07.84s , -70d 01m 00.5s) | C | 20 | 16.0 |\n 137 | 2023-12-12 00:58:54 | MASTER-SAAO | (12h 32m 08.70s , -70d 01m 04.8s) | C | 20 | 16.2 |\n 181 | 2023-12-12 00:59:33 | MASTER-SAAO | (12h 32m 08.04s , -70d 01m 02.8s) | C | 30 | 16.3 |\n 311 | 2023-12-12 01:01:33 | MASTER-SAAO | (12h 05m 02.83s , -69d 49m 54.0s) | C | 50 | 11.9 |\n 397 | 2023-12-12 01:02:54 | MASTER-SAAO | (12h 32m 07.11s , -70d 01m 15.9s) | 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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35324.",
"published": "2023-12-12T01:31:42.959090Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-12T01:31:42.959111Z",
"modified": "2023-12-12T01:31:42.967224Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5277,
"topic": "gcn.circular",
"uuid": "3b5026b3-c866-4215-b390-a308235ba962",
"title": "GRB 231212A: GECAM-C detection of a likely short burst",
"submitter": "Hop gcn.circular",
"authors": "Yue Wang <m18509381757@163.com>",
"data": {
"date": "23/12/12 03:35:22 GMT",
"from": "Yue Wang <m18509381757@163.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35325"
},
"title": "GCN CIRCULAR",
"number": "35325",
"subject": "GRB 231212A: GECAM-C detection of a likely short burst"
},
"message_text": "Yue Wang, Shao-Lin Xiong report on behalf of the GECAM team:\n\nGECAM-C was triggered in-flight by a likely short burst, GRB 231212A, at 2023-12-12T00:56:48.850 UTC (T0), which was also triggered by Fermi/GBM (TrigNum724035412) .\n\nAccording to the realtime alert data, the GECAM-C light curve shows a short pulse with a duration of ~4 sec (15-1050 keV).\n\nThe time-averaged spectrum of GECAM-C realtime data from about T0-2 s to T0+2 s could be\nadequately fit by a cut-off power-law with a flux about 8.01E-7 erg/cm^2/s in 20-1000 keV.\n\nUsing the automatic on-ground localization pipeline with the realtime alert data,\nGECAM-C localized this burst to the following position (J2000):\nRa: 151.1 deg\nDec: -74.1 deg\nErr: 7.1 deg (1-sigma, statistical only)\n\nThe GECAM light curve and localization could be found here:\nhttp://twiki.ihep.ac.cn/pub/GECAM/GRBList/231212A_lc.jpg\nhttp://twiki.ihep.ac.cn/pub/GECAM/GRBList/231212A_loc.png\n\nWe note that these results are based on realtime alert data and thus very preliminary.\n\nGravitational wave high-energy Electromagnetic Counterpart All-sky Monitor(GECAM) mission originally consists of two microsatellites (GECAM-A and GECAM-B) launched in Dec. 2020. As the third member of GECAM constellation, GECAM-C was launched onboard SATech-01 experimental satellite in July 2022. GECAM mission is funded by the Chinese Academy of Sciences (CAS).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35325.",
"published": "2023-12-12T03:35:35.204509Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-12T03:35:35.204525Z",
"modified": "2023-12-12T03:35:35.213081Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5278,
"topic": "gcn.circular",
"uuid": "1038544f-23b2-43e6-8ac7-d8c4fa10640e",
"title": "LIGO/Virgo/KAGRA S231206ca: Upper limits from Swift/BAT-GUANO",
"submitter": "Hop gcn.circular",
"authors": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"data": {
"date": "23/12/12 03:36:12 GMT",
"from": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35326"
},
"title": "GCN CIRCULAR",
"number": "35326",
"subject": "LIGO/Virgo/KAGRA S231206ca: Upper limits from Swift/BAT-GUANO"
},
"message_text": "Samuele Ronchini (PSU), Aaron Tohuvavohu (U Toronto), Tyler Parsotan (NASA GSFC), Jamie A. Kennea (PSU), James DeLaunay (PSU), Gayathri Raman (PSU) report:\n\nSwift/BAT was observing 63.3% of the GW localization probability (bayestar.multiorder.fits) at merger time. A fraction 7% of the GW localization posterior is contained inside the BAT coded FoV.\n\nThe LVK notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1).\n\nUpon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground.\n\nUsing the NITRATES analysis (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), we searched for emission on 8 timescales from 0.128s to 16.384s in the interval [-20,+20] seconds around the merger time. We find no evidence for a signal, and derive the following upper limits.\n\nWe quote the 5-sigma flux upper limits in the 15-350 keV band, weighted over the GW localization, for four spectral templates (soft, normal, and hard GRB-like templates described in [arXiv:1612.02395], and spectral shape from GRB170817A [arXiv:1710.05446]) and for four time bins.\nIn units of 10^-7 erg/s/cm^2:\n\ntime_bin (s) soft normal hard GRB170817\n------------------------------------\n0.256 11.4 7.8 7.1 8.5\n1.024 5.8 4.0 3.6 4.3\n4.096 3.1 2.1 1.9 2.3\n16.38 1.9 1.3 1.2 1.4\n\n\nThe upper limits as function of sky position are plotted here, alongside the GW localization:\nhttps://doi.org/10.5281/zenodo.10344459\nThe solid and dashed lines indicate the 90% and 50% GW contour levels, respectively.\n\nThe corresponding fits file can be found here:\nhttps://doi.org/10.5281/zenodo.10344497\n\nGUANO is a fully autonomous, extremely low latency, spacecraft\ncommanding pipeline designed for targeted recovery of BAT event mode\ndata around the times of compelling astrophysical events to enable\nmore sensitive GRB searches.\n\nA live reporting of Swift/BAT event data recovered by GUANO can be\nfound at: https://www.swift.psu.edu/guano/\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35326.",
"published": "2023-12-12T03:36:19.467202Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-12T03:36:19.467219Z",
"modified": "2023-12-12T03:36:19.472402Z",
"nonlocalizedevents": [
{
"event_id": "S231206c"
}
],
"targets": []
},
{
"id": 5279,
"topic": "gcn.circular",
"uuid": "e041f8fb-b296-4b91-9b8d-7c54e77b2605",
"title": "LIGO/Virgo/KAGRA S231206cc: Upper limits from Swift/BAT-GUANO",
"submitter": "Hop gcn.circular",
"authors": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"data": {
"date": "23/12/12 03:36:14 GMT",
"from": "Samuele Ronchini at PSU <sjs8171@psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35327"
},
"title": "GCN CIRCULAR",
"number": "35327",
"subject": "LIGO/Virgo/KAGRA S231206cc: Upper limits from Swift/BAT-GUANO"
},
"message_text": "Samuele Ronchini (PSU), Gayathri Raman (PSU), Aaron Tohuvavohu (U Toronto), Tyler Parsotan (NASA GSFC), Jamie A. Kennea (PSU), James DeLaunay (PSU) report:\n\nSwift/BAT was observing 100% of the GW localization probability (Bilby.multiorder.fits) at merger time. A fraction <1% of the GW localization posterior is contained inside the BAT coded FoV.\n\nThe LVK notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1).\n\nUpon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground.\n\nUsing the NITRATES analysis (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), we searched for emission on 8 timescales from 0.128s to 16.384s in the interval [-20,+20] seconds around the merger time. We find no evidence for a signal, and derive the following upper limits.\n\nWe quote the 5-sigma flux upper limits in the 15-350 keV band, weighted over the GW localization, for four spectral templates (soft, normal, and hard GRB-like templates described in [arXiv:1612.02395], and spectral shape from GRB170817A [arXiv:1710.05446]) and for four time bins.\nIn units of 10^-7 erg/s/cm^2:\n\ntime_bin (s) soft normal hard GRB170817\n------------------------------------\n0.256 20.1 13.3 11.7 14.9\n1.024 10.2 6.8 6.0 7.6\n4.096 5.5 3.6 3.2 4.1\n16.38 3.4 2.2 2.0 2.5\n\n\nThe upper limits as function of sky position are plotted here, alongside the GW localization:\nhttps://doi.org/10.5281/zenodo.10344607\nThe solid and dashed lines indicate the 90% and 50% GW contour levels, respectively.\n\nThe corresponding fits file can be found here:\nhttps://doi.org/10.5281/zenodo.10344629\n\nGUANO is a fully autonomous, extremely low latency, spacecraft\ncommanding pipeline designed for targeted recovery of BAT event mode\ndata around the times of compelling astrophysical events to enable\nmore sensitive GRB searches.\n\nA live reporting of Swift/BAT event data recovered by GUANO can be\nfound at: https://www.swift.psu.edu/guano/\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35327.",
"published": "2023-12-12T03:36:24.498622Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-12T03:36:24.498638Z",
"modified": "2023-12-12T03:36:24.503790Z",
"nonlocalizedevents": [
{
"event_id": "S231206c"
}
],
"targets": []
},
{
"id": 5282,
"topic": "gcn.circular",
"uuid": "73ac0736-097a-4ac5-93ab-ed024eed6cfc",
"title": "IceCube-231211A - IceCube observation of a high-energy neutrino candidate track-like event",
"submitter": "Hop gcn.circular",
"authors": "Giacomo Sommani at Ruhr-Universität Bochum <gsommani@icecube.wisc.edu>",
"data": {
"date": "23/12/12 16:53:19 GMT",
"from": "Giacomo Sommani at Ruhr-Universität Bochum <gsommani@icecube.wisc.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35328"
},
"title": "GCN CIRCULAR",
"number": "35328",
"subject": "IceCube-231211A - IceCube observation of a high-energy neutrino candidate track-like event"
},
"message_text": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nOn 2023-12-11 at 00:47:31.79 UT IceCube detected a track-like event with a moderate probability of being of astrophysical origin. The event was selected by the ICECUBE_Astrotrack_Bronze alert stream. The average astrophysical neutrino purity \nfor Bronze alerts is 30%. This alert has an estimated false alarm rate of 3.30 events per year due to atmospheric backgrounds. The IceCube detector was in a normal operating state at the time of detection.\n\nAfter the initial automated alert (https://gcn.gsfc.nasa.gov/notices_amon_g_b/138669_4054005.amon) more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:\n\nDate: 2023-12-11\nTime: 00:47:31.79 UT\nRA: 311.48 (+1.15, -2.33 deg 90% PSF containment) J2000\nDec: +10.28 (+0.67, -0.68 deg 90% PSF containment) J2000\n\nWe encourage follow-up by ground and space-based instruments to help identify a possible astrophysical source for the candidate neutrino.\n\nThree gamma-ray sources listed in the 4FGL-DR4 Fermi-LAT catalog are located in the 90% uncertainty of the event. The sources are 4FGL J2044.0+1036, 4FGL J2047.3+1051 and 4FGL J2049.9+1002. The three objects are located 0.6, 0.7 and 1.0 deg away from the best-fit position, respectively. 4FGL J2049.9+1002 was observed in a high-emission state between September and November of this year by Fermi LAT: https://fermi.gsfc.nasa.gov/ssc/data/access/lat/LightCurveRepository/source.html?source_name=4FGL_J2049.9+1002. \nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35328.",
"published": "2023-12-12T16:53:40.127902Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-12T16:53:40.127921Z",
"modified": "2023-12-12T16:53:40.137703Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5284,
"topic": "gcn.circular",
"uuid": "055d30f4-11a4-4765-b2fb-4f90927c2a4d",
"title": "Fermi-LAT detection of increased gamma-ray activity of blazar PKS 2047+098, located inside the IceCube-231211A error region",
"submitter": "Hop gcn.circular",
"authors": "Sara Buson at Univ. of Wurzburg <sara.buson@gmail.com>",
"data": {
"date": "23/12/12 21:39:38 GMT",
"from": "Sara Buson at Univ. of Wurzburg <sara.buson@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35329"
},
"title": "GCN CIRCULAR",
"number": "35329",
"subject": "Fermi-LAT detection of increased gamma-ray activity of blazar PKS 2047+098, located inside the IceCube-231211A error region"
},
"message_text": "L. Pfeiffer (Univ. of Wuerzburg), S. Buson (Univ. of Wuerzburg), S. Garrappa (Weizmann Institute of Science), C. Bartolini (INFN Bari) and J. Sinapius (DESY) on behalf of the Fermi-LAT collaboration:\n\nWe report an analysis of observations of the vicinity of the IC231211A high-energy neutrino event (GCN 35328) with all-sky survey data from the Large Area Telescope (LAT), on board the Fermi Gamma-ray Space Telescope. The IceCube event was detected on 23-12-11 at 00:47:31.79 UT (T0) with J2000 position RA = 311.48 (+1.15, -2.33) deg, Decl. = +10.28 (+0.67, -0.68) deg (90% PSF containment). There are three gamma-ray sources (>100 MeV; 4FGL-DR4, The Fermi-LAT collaboration 2023, arXiv:2307.12546) located within the 90% IC231211A localization region. These are the blazar of uncertain type 4FGL J2044.0+1036 (a.k.a. NVSS J204351+103406) at a distance of roughly 0.57 degree from the best-fit localization and the pulsar 4FGL J2047.3+1051 at a distance of roughly 0.68 degree. Based on a preliminary analysis of the LAT data over the timescales of 1-day and 1-month prior to T0, these objects are not significantly detected (> 5 sigma).\n\nThe third gamma-ray catalogued source found within the 90% event localisation is the BL Lac object 4FGL J2049.9+1002 (a.k.a. PKS 2047+098, at unknown redshift) at a distance of roughly 1.01 degree. The preliminary analysis indicates that this gamma-ray source is undergoing a prolonged, enhanced activity state. The 3-month-binned gamma-ray light curve shows activity over multiple years. Its gamma-ray flux has increased in recent years and is currently higher than what was observed in the previous 15 years of LAT monitoring. The high state began about nine months ago. During the last 3 months, i.e. 3-month integration time before T0, the observed flux (E>100 MeV) of 4FGL J2049.9+1002 is (8.40 +/- 0.80) x 10^-8 photons cm^-2 s^-1 (statistical uncertainty only), more than 3 times greater than the average flux (2.3 +/- 0.2) x 10^-8 photons cm^-2 s^-1 reported in the 4FGL-DR4. Based on a preliminary analysis of the LAT data over the timescale of 1-day prior to T0, this object is not significantly detected in gamma rays. A preliminary light curve of the object is available at https://fermi.gsfc.nasa.gov/ssc/data/access/lat/LightCurveRepository/source.php?source_name=4FGL_J2049.9+1002 We encourage multiwavelength observations of this source. \n\nSince Fermi normally operates in an all-sky scanning mode, regular monitoring of this region will continue. For these observations the Fermi-LAT contact person is L. Pfeiffer (leonard.pfeiffer at stud-mail.uni-wuerzburg.de). \n\nThe Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35329.",
"published": "2023-12-12T21:39:49.116949Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-12T21:39:49.116982Z",
"modified": "2023-12-12T21:39:49.130155Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6467,
"topic": "gcn.circular",
"uuid": "b00be9a6-17ad-4f9b-92f7-e5ffb5178d2f",
"title": "GRB 240408B: GRBAlpha detection",
"submitter": "Hop gcn.circular",
"authors": "Jakub Ripa <ripa.jakub@gmail.com>",
"data": {
"date": "24/04/11 13:25:22 GMT",
"from": "Jakub Ripa <ripa.jakub@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36062"
},
"title": "GCN CIRCULAR",
"number": "36062",
"subject": "GRB 240408B: GRBAlpha detection"
},
"message_text": "J. Ripa, M. Dafcikova, M. Kolar (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, M. Duriskova, L. Szakszonova, J.-P. Breuer, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration.\n\nThe long-duration GRB 240408B (AstroSat detection: GCN 36051; Konus/Wind detection trigger at 2024-04-08 00:10:06.236 UT; INTEGRAL/SPI-ACS peak detection at 2024-04-08 ~00:10:03 UT) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023, A&A, 677, 40; https://ui.adsabs.harvard.edu/abs/2023A%26A...677A..40P/abstract).\n\nThe detection was confirmed at the peak time 2024-04-08 00:10:04.0 UTC. The T90 duration measured by GRBAlpha is 44.5 s and the overall significance during T90 reaches 8.4 sigma.\n\nThe light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB240408B_GCN.pdf\n\nAll GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/hea/GRBAlpha/\nGRBAlpha, launched on March 22 2021, is a demonstration mission for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~50 keV to ~1000 keV. To increase the duty cycle and the downlink rate, the upgrade of the on-board data acquisition software stack is in progress. The ground segment is also supported by the radio amateur community and it takes advantage of the SatNOGS network for increased data downlink volume.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36062.",
"published": "2024-04-11T13:25:37.501415Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-11T13:25:37.501430Z",
"modified": "2024-04-11T13:25:37.509265Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6468,
"topic": "gcn.circular",
"uuid": "58ac95a3-b016-4c14-b0a4-dab7916e0fac",
"title": "GRB 240411B: Swift detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"data": {
"date": "24/04/11 16:09:02 GMT",
"from": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36063"
},
"title": "GCN CIRCULAR",
"number": "36063",
"subject": "GRB 240411B: Swift detection of a burst"
},
"message_text": "\nT. M. Parsotan (GSFC), S. Dichiara (PSU),\nR. A. J. Eyles-Ferris (U Leicester), C. Gronwall (PSU),\nJ.D. Gropp (PSU), J. A. Kennea (PSU), K. L. Page (U Leicester),\nB. Sbarufatti (INAF-OAB), M. H. Siegel (PSU) and M. A. Williams (PSU)\nreport on behalf of the Neil Gehrels Swift Observatory Team:\n\nAt 15:32:54 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 240411B (trigger\u001221183). Swift slewed immediately to the burst.\nNo further BAT information is available at this time due to a\ntelemetry gap. Further information will be available after the\nnext telemetry pass over a ground station.\n\nThe XRT began observing the field at approximately 15:35:54 UT, around 180\nseconds after the BAT trigger. Using promptly downlinked data we find an\nuncatalogued X-ray source with an enhanced position: RA, Dec 231.54236,\n-2.14609 which is equivalent to:\n RA(J2000) = 15h 26m 10.17s\n Dec(J2000) = -02d 08' 45.9\"\nwith an uncertainty of 1.9 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 consistent with the Galactic value of 1.11\nx 10^21 cm^-2 (Willingale et al. 2013).\n\nUVOT took a finding chart exposure of 150 seconds with the White\nfilter starting 190 seconds after the BAT trigger. No credible\nafterglow candidate has been found in the initial data products. The\n2.7'x2.7' sub-image covers none of the XRT error circle. The 8'x8'\nregion for the list of sources generated on-board covers 100% of the\nXRT error circle. The list of sources is typically complete to about\n18 mag. No correction has been made for the expected extinction\ncorresponding to E(B-V) of 0.138.\n\nBurst Advocate for this burst is T. M. Parsotan (parsotat 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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36063.",
"published": "2024-04-11T16:09:18.315932Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-11T16:09:18.315950Z",
"modified": "2024-04-11T16:09:18.323952Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6469,
"topic": "gcn.circular",
"uuid": "46503553-0ba4-420e-8cc1-6d0ee653d09c",
"title": "GRB 240411B: LCO optical afterglow detection",
"submitter": "Hop gcn.circular",
"authors": "luca.izzo@inaf.it",
"data": {
"date": "24/04/11 18:43:10 GMT",
"from": "luca.izzo@inaf.it",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36064"
},
"title": "GCN CIRCULAR",
"number": "36064",
"subject": "GRB 240411B: LCO optical afterglow detection"
},
"message_text": "L. Izzo (INAF-OACn & DARK/NBI), D. B. Malesani (DAWN/NBI and Radboud Univ.), M. Della Valle and R. Martone (INAF-OACn) report:\n\nWe observed the field of GRB 240411B (Parsotan et al., GCN 36063) with the Sinistro instrument mounted on the 1-m telescope of the LCO network, located at Siding Spring Observatory, Australia. Observations started on April 11 at 17:02:54 UT (1.5 hours after the GRB trigger). We obtained a series of 3x180 s images in the r filter.\n\nIn the stacked image, we detect a new source within the XRT position, at the coordinates:\n\nRA(J2000) = 15:26:10.17\nDec(J2000) = -02:08:46.8\n\nWe measure a preliminary magnitude of r = 21.66 +- 0.22 (AB), calibrated against nearby stars from the Pan-STARRS catalog.\n\nThis source is not visible in the Pan-STARRS catalog and is thus very likely the optical afterglow of GRB 240411B.\n\nThis project has received funding from the European Union's Horizon 2020 research and innovation program under grant agreement No 730890.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36064.",
"published": "2024-04-11T18:43:27.130771Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-11T18:43:27.130783Z",
"modified": "2024-04-11T18:43:27.138862Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5292,
"topic": "gcn.circular",
"uuid": "629d15e7-43e3-4ab6-b380-cf6a558e56d8",
"title": "LIGO/Virgo/KAGRA S231213ap: Updated Sky localization",
"submitter": "Hop gcn.circular",
"authors": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"data": {
"date": "23/12/13 17:14:13 GMT",
"from": "Aditya Vijaykumar <aditya.vijaykumar@ligo.org>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35331"
},
"title": "GCN CIRCULAR",
"number": "35331",
"subject": "LIGO/Virgo/KAGRA S231213ap: Updated Sky localization"
},
"message_text": "The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report:\n\nWe have conducted further analysis of the LIGO Hanford Observatory (H1) and LIGO Livingston Observatory (L1) data around the time of the compact binary merger (CBC) candidate S231213ap (GCN Circular 35330). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.multiorder.fits,0, distributed via GCN Notice, is available for retrieval from the GraceDB event page:\n\nhttps://gracedb.ligo.org/superevents/S231213ap\n\nFor the Bilby.multiorder.fits,0 sky map, the 90% credible region is 1469 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 3861 +/- 1257 Mpc (a posteriori mean +/- standard deviation).\n\nFor further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/userguide/.\n\n [1] Ashton et al. ApJS 241, 27 (2019) and Morisaki et al. arXiv:2307.13380 (2023)\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35331.",
"published": "2023-12-13T17:14:27.119239Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-13T17:14:27.119254Z",
"modified": "2023-12-13T17:14:27.124757Z",
"nonlocalizedevents": [
{
"event_id": "S231213a"
}
],
"targets": []
},
{
"id": 5293,
"topic": "gcn.circular",
"uuid": "c7c24d3e-77ce-4288-bfb7-7da6828e637e",
"title": "IceCube-231211A: Upper limits from a search for additional neutrino events in IceCube",
"submitter": "Hop gcn.circular",
"authors": "Jessie Thwaites at IceCube/U Wisc-Madison <thwaites@wisc.edu>",
"data": {
"date": "23/12/13 22:08:40 GMT",
"from": "Jessie Thwaites at IceCube/U Wisc-Madison <thwaites@wisc.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35332"
},
"title": "GCN CIRCULAR",
"number": "35332",
"subject": "IceCube-231211A: Upper limits from a search for additional neutrino events in IceCube"
},
"message_text": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nIceCube has performed a search [1] for additional track-like muon neutrino events arriving from the direction of IceCube-231211A (https://gcn.nasa.gov/circulars/35328) in a time range of 1000 seconds centered on the alert event time (2023-12-11 00:39:11.790 UTC to 2023-12-11 00:55:51.790 UTC) during which IceCube was collecting good quality data. Excluding the event that prompted the alert, zero track-like events are found within the 90% containment region of IceCube-231211A. The IceCube sensitivity to neutrino point sources with an E^-2.5 spectrum (E^2 dN/dE at 1 TeV) within the locations spanned by the 90% spatial containment region of IceCube-231211A is 1.3e-01 GeV cm^-2 in a 1000 second time window. 90% of events IceCube would detect from a source at this declination with an E^-2.5 spectrum have energies in the approximate energy range between 2e+02 GeV and 1e+05 GeV.\n\nA subsequent search was performed including 2 days of data centered on the alert event time (2023-12-10 00:47:31.790 UTC to 2023-12-12 00:47:31.790 UTC). One track-like event is found to be within the 90% contour of the alert event. Its properties are shown in the table below. In this case, we report a p-value of 0.02, consistent with no significant excess of track events. The IceCube sensitivity to neutrino point sources with an E^-2.5 spectrum (E^2 dN/dE at 1 TeV) within the locations spanned by the 90% spatial containment region of IceCube-231211A is 1.5e-01 GeV cm^-2 in a 2 day time window.\n\ndt(s)\t\tRA(deg)\t\tDec(deg)\tAngular uncertainty(deg)\n-----------------------------------------------------------------------------------------------\n64664\t\t311.73\t\t10.06\t\t1.03\n\nwhere:\ndt = Time of track event minus time of alert event (sec)\nAngular uncertainty = Angular uncertainty of track event: the radius of a circle\n representing 90% CL containment by area\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu.\n\n[1] IceCube Collaboration, R. Abbasi et al., ApJ 910 4 (2021)\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35332.",
"published": "2023-12-13T22:08:51.181168Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-13T22:08:51.181184Z",
"modified": "2023-12-13T22:08:51.188282Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5301,
"topic": "gcn.circular",
"uuid": "450b15c9-32b7-4ad8-b657-0ebfbcc97f17",
"title": "GRB 231214A: 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": "23/12/14 20:34:47 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35334"
},
"title": "GCN CIRCULAR",
"number": "35334",
"subject": "GRB 231214A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 20:24:24 UT on 14 Dec 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231214A (trigger 724278269.684604 / 231214850).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 302.2, Dec = -72.1 (J2000 degrees, equivalent to J2000 20h 08m, -72d 05'), with a statistical uncertainty of 1.0 degrees.\n\nThe angle from the Fermi LAT boresight is 50.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231214850/quicklook/glg_skymap_all_bn231214850.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/bn231214850/quicklook/glg_healpix_all_bn231214850.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231214850/quicklook/glg_lc_medres34_bn231214850.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35334.",
"published": "2023-12-14T20:35:01.719223Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-14T20:35:01.719239Z",
"modified": "2023-12-14T20:35:01.728348Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5302,
"topic": "gcn.circular",
"uuid": "d5fcb7b9-c72e-4973-b247-c670ae976945",
"title": "GRB 231214A: Swift detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"data": {
"date": "23/12/14 20:38:57 GMT",
"from": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35335"
},
"title": "GCN CIRCULAR",
"number": "35335",
"subject": "GRB 231214A: Swift detection of a burst"
},
"message_text": "\nR. Brivio (INAF-OAB), P. D'Avanzo (INAF-OAB), S. Dichiara (PSU),\nM. Ferro (INAF-OAB), M. J. Moss (GSFC), K. L. Page (U Leicester),\nD. M. Palmer (LANL), C. Salvaggio (INAF-OAB) and M. A. Williams (PSU)\nreport on behalf of the Neil Gehrels Swift Observatory Team:\n\nAt 20:24:28 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 231214A (trigger\u001202386). Swift slewed immediately to the burst.\nThe BAT on-board calculated location is\nRA, Dec 305.736, -72.436 which is\n RA(J2000) = 20h 22m 57s\n Dec(J2000) = -72d 26' 09\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including\nsystematic uncertainty). The BAT light curve showed a double-peaked\nstructure with a duration of about 30 sec. The peak count rate\nwas ~8000 counts/sec (15-350 keV), at ~13 sec after the trigger.\n\nThe XRT began observing the field at 20:26:14.5 UT, 106.2 seconds after\nthe BAT trigger. Using promptly downlinked data we find an uncatalogued\nX-ray source with an enhanced position: RA, Dec 305.68573, -72.43256\nwhich is equivalent to:\n RA(J2000) = 20h 22m 44.58s\n Dec(J2000) = -72d 25' 57.2\"\nwith an uncertainty of 1.9 arcseconds (radius, 90% containment). This\nlocation is 56 arcseconds from the BAT onboard position, within the BAT\nerror circle. This position may be improved as more data are received;\nthe latest position is available at https://www.swift.ac.uk/sper. We\ncannot determine whether the source is fading at the present time. No\nspectrum from the promptly downlinked event data is yet available to\ndetermine the column density.\n\nUVOT took a finding chart exposure of 39 seconds with the White filter\nstarting 442 seconds after the BAT trigger. No credible afterglow candidate has\nbeen found in the initial data products. The 2.7'x2.7' sub-image covers 100% of\nthe XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag.\nThe 8'x8' region for the list of sources generated on-board covers 100% of the\nXRT error circle. The list of sources is typically complete to about 18 mag. No\ncorrection has been made for the expected extinction corresponding to E(B-V) of\n0.060.\n\nBurst Advocate for this burst is R. Brivio (riccardo.brivio AT inaf.it).\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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35335.",
"published": "2023-12-14T20:39:05.175410Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-14T20:39:05.175425Z",
"modified": "2023-12-14T20:39:05.180753Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5303,
"topic": "gcn.circular",
"uuid": "b77d27ec-572f-4863-849a-a69978d7e555",
"title": "Swift GRB231214.85: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/12/14 20:41:31 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35336"
},
"title": "GCN CIRCULAR",
"number": "35336",
"subject": "Swift GRB231214.85: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-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 GRB231214.85 (trigger No 1202386,20h 22m 56.64s , -72d 26m 09.6s, R=0.05) errorbox 81 sec after notice time and 103 sec after trigger time at 2023-12-14 20:26:11 UT, with upper limit up to 18.5 mag. The observations began at zenith distance = 65 deg. The sun altitude is -27.0 deg.\n\nThe galactic latitude b = -33 deg., longitude l = 322 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#32686\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 108 | MASTER-SAAO | P\\\\ | 10 | 16.9 |\n 133 | MASTER-SAAO | P\\\\ | 60 | 18.3 | Coadd\n 108 | MASTER-SAAO | P/ | 10 | 16.8 |\n 133 | MASTER-SAAO | P/ | 60 | 18.0 | Coadd\n 131 | MASTER-SAAO | P\\\\ | 20 | 17.6 |\n 131 | MASTER-SAAO | P/ | 20 | 17.4 |\n 176 | MASTER-SAAO | P\\\\ | 30 | 18.0 |\n 176 | MASTER-SAAO | P/ | 30 | 17.8 |\n 219 | MASTER-SAAO | P\\\\ | 40 | 18.2 |\n 219 | MASTER-SAAO | P/ | 40 | 17.9 |\n 274 | MASTER-SAAO | P/ | 150 | 18.5 | Coadd\n 271 | MASTER-SAAO | P\\\\ | 50 | 18.2 |\n 271 | MASTER-SAAO | P/ | 50 | 18.1 |\n 346 | MASTER-SAAO | P\\\\ | 60 | 17.5 |\n 346 | MASTER-SAAO | P/ | 60 | 17.5 |\n 425 | MASTER-SAAO | P\\\\ | 60 | 17.3 |\n 425 | MASTER-SAAO | P/ | 60 | 17.4 |\n 516 | MASTER-SAAO | P\\\\ | 60 | 17.3 |\n 516 | MASTER-SAAO | P/ | 60 | 17.4 |\n 596 | MASTER-SAAO | P\\\\ | 60 | 17.3 |\n 596 | MASTER-SAAO | P/ | 60 | 17.4 |\n 686 | MASTER-SAAO | P\\\\ | 60 | 17.4 |\n 686 | MASTER-SAAO | P/ | 60 | 17.4 |\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35336.",
"published": "2023-12-14T20:41:38.423343Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-14T20:41:38.423356Z",
"modified": "2023-12-14T20:41:38.428706Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5304,
"topic": "gcn.circular",
"uuid": "10179469-c3c1-4954-92f3-c6f214845139",
"title": "Fermi trigger No 724233240: 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": "23/12/14 20:45:26 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35337"
},
"title": "GCN CIRCULAR",
"number": "35337",
"subject": "Fermi trigger No 724233240: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB231214.33 (trigger No 724233240,09h 11m 43.20s , -13d 25m 12.0s, R=6.25) errorbox 31345 sec after notice time and 44890 sec after trigger time at 2023-12-14 20:22:05 UT, with upper limit up to 14.5 mag. The observations began at zenith distance = 75 deg. The sun altitude is -68.3 deg.\n\nThe galactic latitude b = 23 deg., longitude l = 244 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#32310\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 44920 | 2023-12-14 20:22:05 | MASTER-Kislovodsk | (08h 45m 02.87s , -08d 34m 48.1s) | C | 60 | 13.2 |\n 45328 | 2023-12-14 20:28:53 | MASTER-Kislovodsk | (08h 47m 46.33s , -10d 26m 27.1s) | C | 60 | 14.1 |\n 45408 | 2023-12-14 20:30:13 | MASTER-Kislovodsk | (09h 13m 24.34s , -06d 40m 15.1s) | C | 60 | 13.6 |\n 45892 | 2023-12-14 20:38:17 | MASTER-Kislovodsk | (08h 44m 58.67s , -08d 32m 54.9s) | C | 60 | 14.5 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35337.",
"published": "2023-12-14T20:45:33.861120Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-14T20:45:33.861136Z",
"modified": "2023-12-14T20:45:33.866595Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5305,
"topic": "gcn.circular",
"uuid": "6f141854-0d9e-4178-91b2-7b8485882a3e",
"title": "Fermi trigger No 724278269: 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": "23/12/14 20:45:55 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35338"
},
"title": "GCN CIRCULAR",
"number": "35338",
"subject": "Fermi trigger No 724278269: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB231214.85 (trigger No 724278269,20h 08m 55.20s , -72d 07m 12.0s, R=1.01) errorbox 69 sec after notice time and 106 sec after trigger time at 2023-12-14 20:26:11 UT, with upper limit up to 18.5 mag. The observations began at zenith distance = 65 deg. The sun altitude is -27.0 deg.\n\nThe galactic latitude b = -32 deg., longitude l = 323 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#32732\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 112 | 2023-12-14 20:26:11 | MASTER-SAAO | (20h 06m 32.45s , -72d 15m 27.8s) | P\\\\ | 10 | 16.9 |\n 137 | 2023-12-14 20:26:11 | MASTER-SAAO | (20h 06m 32.48s , -72d 15m 27.8s) | P\\\\ | 60 | 18.3 | Coadd\n 112 | 2023-12-14 20:26:11 | MASTER-SAAO | (20h 36m 58.62s , -72d 27m 31.6s) | P/ | 10 | 16.8 |\n 137 | 2023-12-14 20:26:11 | MASTER-SAAO | (20h 36m 58.66s , -72d 27m 31.5s) | P/ | 60 | 18.0 | Coadd\n 135 | 2023-12-14 20:26:29 | MASTER-SAAO | (20h 06m 32.75s , -72d 15m 27.5s) | P\\\\ | 20 | 17.6 |\n 135 | 2023-12-14 20:26:29 | MASTER-SAAO | (20h 36m 58.90s , -72d 27m 31.0s) | P/ | 20 | 17.4 |\n 180 | 2023-12-14 20:27:09 | MASTER-SAAO | (20h 06m 33.16s , -72d 15m 27.1s) | P\\\\ | 30 | 18.0 |\n 180 | 2023-12-14 20:27:09 | MASTER-SAAO | (20h 36m 59.25s , -72d 27m 30.3s) | P/ | 30 | 17.8 |\n 222 | 2023-12-14 20:27:47 | MASTER-SAAO | (20h 06m 33.30s , -72d 15m 26.0s) | P\\\\ | 40 | 18.2 |\n 222 | 2023-12-14 20:27:47 | MASTER-SAAO | (20h 36m 59.67s , -72d 27m 30.6s) | P/ | 40 | 17.9 |\n 277 | 2023-12-14 20:27:47 | MASTER-SAAO | (20h 36m 59.66s , -72d 27m 30.6s) | P/ | 150 | 18.5 | Coadd\n 275 | 2023-12-14 20:28:34 | MASTER-SAAO | (20h 06m 33.78s , -72d 15m 25.0s) | P\\\\ | 50 | 18.2 |\n 275 | 2023-12-14 20:28:34 | MASTER-SAAO | (20h 37m 00.01s , -72d 27m 29.6s) | P/ | 50 | 18.1 |\n 349 | 2023-12-14 20:29:43 | MASTER-SAAO | (20h 06m 35.12s , -72d 15m 26.7s) | P\\\\ | 60 | 17.5 |\n 349 | 2023-12-14 20:29:43 | MASTER-SAAO | (20h 36m 59.62s , -72d 27m 32.2s) | P/ | 60 | 17.5 |\n 429 | 2023-12-14 20:31:03 | MASTER-SAAO | (20h 06m 35.82s , -72d 15m 25.2s) | P\\\\ | 60 | 17.3 |\n 489 | 2023-12-14 20:31:03 | MASTER-SAAO | (20h 06m 35.82s , -72d 15m 25.2s) | P\\\\ | 180 | 17.8 | Coadd\n 429 | 2023-12-14 20:31:03 | MASTER-SAAO | (20h 37m 00.34s , -72d 27m 31.0s) | P/ | 60 | 17.4 |\n 489 | 2023-12-14 20:31:03 | MASTER-SAAO | (20h 37m 00.37s , -72d 27m 31.1s) | P/ | 180 | 18.0 | Coadd\n 520 | 2023-12-14 20:32:34 | MASTER-SAAO | (20h 06m 36.31s , -72d 15m 22.9s) | P\\\\ | 60 | 17.3 |\n 520 | 2023-12-14 20:32:34 | MASTER-SAAO | (20h 37m 01.11s , -72d 27m 30.4s) | P/ | 60 | 17.4 |\n 599 | 2023-12-14 20:33:53 | MASTER-SAAO | (20h 06m 36.99s , -72d 15m 21.8s) | P\\\\ | 60 | 17.3 |\n 599 | 2023-12-14 20:33:53 | MASTER-SAAO | (20h 37m 01.84s , -72d 27m 29.5s) | P/ | 60 | 17.4 |\n 689 | 2023-12-14 20:35:23 | MASTER-SAAO | (20h 06m 37.85s , -72d 15m 20.6s) | P\\\\ | 60 | 17.4 |\n 689 | 2023-12-14 20:35:23 | MASTER-SAAO | (20h 37m 02.81s , -72d 27m 28.6s) | P/ | 60 | 17.4 |\n 769 | 2023-12-14 20:36:43 | MASTER-SAAO | (20h 06m 38.51s , -72d 15m 18.9s) | P\\\\ | 60 | 17.3 |\n 769 | 2023-12-14 20:36:43 | MASTER-SAAO | (20h 37m 03.55s , -72d 27m 27.9s) | P/ | 60 | 17.4 |\n 860 | 2023-12-14 20:38:14 | MASTER-SAAO | (20h 06m 39.32s , -72d 15m 17.5s) | P\\\\ | 60 | 17.3 |\n 860 | 2023-12-14 20:38:14 | MASTER-SAAO | (20h 37m 04.57s , -72d 27m 27.2s) | P/ | 60 | 17.4 |\n 951 | 2023-12-14 20:39:45 | MASTER-SAAO | (20h 06m 40.13s , -72d 15m 16.4s) | P\\\\ | 60 | 17.3 |\n 951 | 2023-12-14 20:39:45 | MASTER-SAAO | (20h 37m 05.44s , -72d 27m 26.6s) | P/ | 60 | 17.4 |\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35338.",
"published": "2023-12-14T20:46:24.930205Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-14T20:46:24.930221Z",
"modified": "2023-12-14T20:46:24.935402Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6470,
"topic": "gcn.circular",
"uuid": "6e98eea7-15a5-4f0d-b21d-9514a267daf2",
"title": "GRB 240411B: Enhanced Swift-XRT position",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/04/11 19:09:04 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36065"
},
"title": "GCN CIRCULAR",
"number": "36065",
"subject": "GRB 240411B: Enhanced Swift-XRT position"
},
"message_text": "M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester)\nreport on behalf of the Swift-XRT team.\n\nUsing 373 s of XRT Photon Counting mode data and 1 UVOT\nimages for GRB 240411B, 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 = 231.54213, -2.14640 which is equivalent\nto:\n\nRA (J2000): 15h 26m 10.11s\nDec (J2000): -02d 08' 47.0\"\n\nwith an uncertainty of 2.6 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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36065.",
"published": "2024-04-11T19:09:23.711920Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-11T19:09:23.711933Z",
"modified": "2024-04-11T19:09:23.717999Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5306,
"topic": "gcn.circular",
"uuid": "81d8b214-55bf-4295-94f3-dec5d21dc41a",
"title": "GRB231214A: BOOTES-6/DPRT optical upper limit",
"submitter": "Hop gcn.circular",
"authors": "Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>",
"data": {
"date": "23/12/14 21:35:30 GMT",
"from": "Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35339"
},
"title": "GCN CIRCULAR",
"number": "35339",
"subject": "GRB231214A: BOOTES-6/DPRT optical upper limit"
},
"message_text": "Y.-D. Hu, E. Fernandez-Garcia, I. Perez-Garcia, M.D. Caballero-Garcia, R. Sanchez-Ramirez, S. Guziy, S.-Y. Wu and A. J. Castro-Tirado (IAA-CSIC, Granada), P. J. Meintjes and H. J. van Heerden (UFS, South Africa), 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 231214A by Swift (Brivio et al. GCNC 35335) and Fermi (Fermi GBM team GCNC 35334), the BOOTES-6/DPRT 0.6m robotic telescope at Boyden Observatory in Maselspoort (South Africa) automatically observed the GRB location starting on Dec. 14, 20:42 UT (~ 18 min after trigger). No new optical source is detected on the co-added images (11 x 10 s, clear-filter) within the Swift/XRT error region down to 19.1 mag, which is consistent with both reports from UVOT (Brivio et al. GCNC 35335) and MASTER (Lipunov et al. GCNC 35336).\n\nWe thank the staff at Boyden Observatory for their excellent support.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35339.",
"published": "2023-12-14T21:35:41.255558Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-14T21:35:41.255576Z",
"modified": "2023-12-14T21:35:41.265102Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5307,
"topic": "gcn.circular",
"uuid": "7abacb69-7171-4982-b07d-554aa9b0afaa",
"title": "GRB 231214B: Swift/BAT-GUANO detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "Jimmy DeLaunay at Penn State <delauj2@gmail.com>",
"data": {
"date": "23/12/14 22:38:11 GMT",
"from": "Jimmy DeLaunay at Penn State <delauj2@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35340"
},
"title": "GCN CIRCULAR",
"number": "35340",
"subject": "GRB 231214B: Swift/BAT-GUANO detection of a burst"
},
"message_text": "James DeLaunay (PSU), Gayathri Raman (PSU), Samuele Ronchini (PSU), Aaron Tohuvavohu (U Toronto), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:\n\nSwift/BAT did not localize GRB 231214B onboard (T0: 2023-12-14T07:53:55.52 UTC, Fermi GBM Trig 724233240).\n\nThe Fermi notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1).\n\nUpon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground.\n\nThe BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), performed on the temporal window [T0-20 s, T0+20 s], detects the burst with a sqrt(TS) of 8.6 in a 16.384 s analysis time bin, starting at T0 - 8.192 s.\n\nNITRATES results, independently, are ambiguous with respect to whether this burst originates from in or outside the BAT coded FOV, with a DeltaLLHOut of 8.2.\n\nSee Section 9.1 and Figures 10 and 17 in the NITRATES paper for brief descriptions and interpretation of sqrt(TS), DeltaLLHPeak, and DeltaLLHOut.\n\nGUANO is a fully autonomous, extremely low latency, spacecraft\ncommanding pipeline designed for targeted recovery of BAT event mode\ndata around the times of compelling astrophysical events to enable\nmore sensitive GRB searches.\n\nA live reporting of Swift/BAT event data recovered by GUANO can be\nfound at: https://www.swift.psu.edu/guano/\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35340.",
"published": "2023-12-14T22:38:22.050428Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-14T22:38:22.050445Z",
"modified": "2023-12-14T22:38:22.058199Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5310,
"topic": "gcn.circular",
"uuid": "db072b38-eba5-4e81-a44b-c2ec3d60c6e6",
"title": "GRB 231214A: Enhanced Swift-XRT position",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/12/15 00:45:23 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35341"
},
"title": "GCN CIRCULAR",
"number": "35341",
"subject": "GRB 231214A: 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 842 s of XRT Photon Counting mode data and 4 UVOT\nimages for GRB 231214A, 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 = 305.68530, -72.43283 which is equivalent\nto:\n\nRA (J2000): 20h 22m 44.47s\nDec (J2000): -72d 25' 58.2\"\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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35341.",
"published": "2023-12-15T00:45:33.865899Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T00:45:33.865921Z",
"modified": "2023-12-15T00:45:33.872626Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6471,
"topic": "gcn.circular",
"uuid": "105c77e5-7500-4abd-b60b-9b3c626671a7",
"title": "GRB 240405A: Glowbug gamma-ray detection",
"submitter": "Hop gcn.circular",
"authors": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"data": {
"date": "24/04/11 22:51:00 GMT",
"from": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36066"
},
"title": "GCN CIRCULAR",
"number": "36066",
"subject": "GRB 240405A: Glowbug gamma-ray detection"
},
"message_text": "C.C. Cheung, R. Woolf, M. Kerr, J.E. Grove (NRL), A. Goldstein (USRA), C.A. Wilson-Hodge, D. Kocevski (MSFC), and M.S. Briggs (UAH) report:\n \nThe Glowbug gamma-ray telescope [1,2], operating on the International Space Station, reports the detection of GRB 240405A, which was also detected by Fermi/GBM (GCN 36037) and GRBAlpha (GCN 36054). \n \nUsing an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2024-04-05 15:06:44.536 with a duration of 56.3 s and a total significance of about 21.2 sigma. The light curve comprises two main emission episodes from T0 to T0+1.0s and T0+48.1s to T0+56.3s.\n \nThe analysis results presented here are preliminary and use a response function that lacks a detailed characterization of the surrounding passive structure of the ISS.\n \nGlowbug is a NASA-funded technology demonstrator for sensitive, low-cost gamma-ray transient telescopes developed, built, and operated by the U.S. Naval Research Laboratory (NRL) with support from the University of Alabama in Huntsville, USRA, and NASA MSFC. It was launched on 2023 March 15 aboard the Department of Defense Space Test Programâs STP-H9 to the ISS. The detector comprises 12 large-area (15 cm x 15 cm) CsI:Tl panels covering the surface of a half cube, and two hexagonal (5-cm diameter, 10-cm length) CLLB scintillators, giving it a large field of view (instantaneous FoV ~2/3 sky) over a wide energy band of 50 keV to >2 MeV.\n \n[1] Grove, J.E. et al. 2020, Proc. Yamada Conf. LXXI, arXiv:2009.11959\n[2] Woolf, R.S. et al. 2022, Proc. SPIE, 12181, id. 121811O\n[3] Goldstein, A. et al. 2020, ApJ 895, 40, arXiv :1909.03006\n \nDistribution Statement A: Approved for public release. Distribution is unlimited.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36066.",
"published": "2024-04-11T22:51:15.664709Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-11T22:51:15.664725Z",
"modified": "2024-04-11T22:51:15.673305Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5313,
"topic": "gcn.circular",
"uuid": "f5566dc8-8751-4b59-ba91-0d81c9fbb2cb",
"title": "GRB 231214A: Fermi-LAT detection",
"submitter": "Hop gcn.circular",
"authors": "Makoto Arimoto at Tokyo Inst of Tech <arimoto@hp.phys.titech.ac.jp>",
"data": {
"date": "23/12/15 06:25:50 GMT",
"from": "Makoto Arimoto at Tokyo Inst of Tech <arimoto@hp.phys.titech.ac.jp>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35342"
},
"title": "GCN CIRCULAR",
"number": "35342",
"subject": "GRB 231214A: Fermi-LAT detection"
},
"message_text": "D. Kocevski (NASA/MSFC), N. Di Lalla (Stanford University), M. Arimoto\n(Kanazawa University), and T. Khalil (Johannesburg University) report\non behalf of the Fermi-LAT Collaboration:\n\nOn December 14, 2023 Fermi-LAT detected high-energy emission from GRB\n231214A, which was also detected by Fermi-GBM (trigger\n724278269.684604 / 231214850, GCN 35334), Swift-BAT and Swift-XRT (GCN\n35335, 35341).\n\nThe best LAT on-ground location is found to be\nRA, Dec = 306.1, -72.4 (degrees, J2000)\nwith an error radius of 0.2 deg (90% containment, statistical error\nonly). This was 51 deg from the LAT boresight at the time of the GBM\ntrigger: T0 = 20:24:24.69 UT.\n\nThe data from the Fermi-LAT show a significant increase in the event\nrate after the GBM trigger that is spatially correlated with the GBM\nemission with high significance. The photon flux above 100 MeV in the\ntime interval 0-3000 s after the GBM trigger is (3.9 +/- 0.8)E-6\nph/cm2/s.\nThe estimated photon index above 100 MeV is -1.9 +/- 0.2. The\nhighest-energy photon is a 2.9 GeV event which is observed 414 seconds\nafter the GBM trigger.\nThe Fermi-LAT point of contact for this burst is Tamador Khalil\n(tamtam2030@gmail.com)\n\nThe Fermi-LAT is a pair conversion telescope designed to cover the\nenergy band from 20 MeV to greater than 300 GeV. It is the product of\nan international collaboration between NASA and DOE in the U.S. and\nmany scientific institutions across France, Italy, Japan and Sweden.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35342.",
"published": "2023-12-15T06:26:05.541788Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T06:26:05.541803Z",
"modified": "2023-12-15T06:26:05.552310Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5314,
"topic": "gcn.circular",
"uuid": "56dacc40-9f01-43f9-8167-e2e8d39ce466",
"title": "GRB 231215A: Swift detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "David Palmer at LANL <palmer@lanl.gov>",
"data": {
"date": "23/12/15 09:55:59 GMT",
"from": "David Palmer at LANL <palmer@lanl.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35343"
},
"title": "GCN CIRCULAR",
"number": "35343",
"subject": "GRB 231215A: Swift detection of a burst"
},
"message_text": "\nP. D'Avanzo (INAF-OAB), R. Brivio (INAF-OAB), M. Ferro (INAF-OAB),\nJ.D. Gropp (PSU), K. L. Page (U Leicester), D. M. Palmer (LANL),\nT. Sakamoto (AGU), C. Salvaggio (INAF-OAB), T. Sbarrato (INAF-OAB),\nB. Sbarufatti (INAF-OAB) and M. H. Siegel (PSU) report on behalf of\nthe Neil Gehrels Swift Observatory Team:\n\nAt 09:47:25 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 231215A (trigger\u001202522). Swift could not immediately slew\ndue to an Earth limb observing constraint.\nThe BAT on-board calculated location is\nRA, Dec 9.750, +57.642 which is\n RA(J2000) = 00h 39m 00s\n Dec(J2000) = +57d 38' 32\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including\nsystematic uncertainty). The BAT light curve showed a complex\nstructure with a duration of about 30 sec. The peak count rate\nwas ~6000 counts/sec (15-350 keV), at ~1 sec after the trigger.\n\nDue to an observing constraint, Swift will not slew until T0+42.6\nminutes. There will be no XRT or UVOT data until this time.\n\nBurst Advocate for this burst is P. D'Avanzo (paolo.davanzo AT inaf.it).\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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35343.",
"published": "2023-12-15T09:56:09.106761Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T09:56:09.106778Z",
"modified": "2023-12-15T09:56:09.116011Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5315,
"topic": "gcn.circular",
"uuid": "af122cd3-fc73-4b12-927f-dd1fd818ea66",
"title": "GRB 231215B: 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": "23/12/15 09:57:45 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35344"
},
"title": "GCN CIRCULAR",
"number": "35344",
"subject": "GRB 231215B: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 09:47:17 UT on 15 Dec 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231215B (trigger 724326442.811262 / 231215408).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 11.1, Dec = 61.2 (J2000 degrees, equivalent to J2000 00h 44m, 61d 12'), with a statistical uncertainty of 1.0 degrees.\n\nThe angle from the Fermi LAT boresight is 114.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231215408/quicklook/glg_skymap_all_bn231215408.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/bn231215408/quicklook/glg_healpix_all_bn231215408.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231215408/quicklook/glg_lc_medres34_bn231215408.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35344.",
"published": "2023-12-15T09:57:52.251237Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T09:57:52.251252Z",
"modified": "2023-12-15T09:57:52.258219Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5316,
"topic": "gcn.circular",
"uuid": "ed006a24-9de6-4956-ad06-027bc45afe0e",
"title": "GRB 231215A: Swift-XRT observations",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/12/15 11:15:35 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35345"
},
"title": "GCN CIRCULAR",
"number": "35345",
"subject": "GRB 231215A: Swift-XRT observations"
},
"message_text": "P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), D.N. Burrows\n(PSU), J.A. Kennea (PSU), S. Campana (INAF-OAB) and G. Cusumano\n(INAF-IASF PA) report on behalf of the Swift-XRT team:\n\nThe XRT began observing the field of GRB 231215A at 10:32:51.0 UT,\n2725.7 seconds after the BAT trigger. Using promptly downlinked data we\nfind a bright, fading, uncatalogued X-ray source located at RA, Dec\n9.74175, 57.64645 which is equivalent to:\n RA(J2000) = 00h 38m 58.02s\n Dec(J2000) = +57d 38' 47.2\"\nwith an uncertainty of 3.6 arcseconds (radius, 90% containment). This\nlocation is 22 arcseconds from the BAT onboard position, within the BAT\nerror circle. This position may be improved as more data are received;\nthe latest position is available at https://www.swift.ac.uk/sper.\n\nA power-law fit to a spectrum formed from promptly downlinked event\ndata gives a column density in excess of the Galactic value (4.25 x\n10^21 cm^-2, Willingale et al. 2013), with an excess column of 4.7\n(+2.34/-2.12) x 10^21 cm^-2 (90% confidence).\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35345.",
"published": "2023-12-15T11:15:45.523903Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T11:15:45.523918Z",
"modified": "2023-12-15T11:15:45.533056Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5317,
"topic": "gcn.circular",
"uuid": "2e38ce92-3f1a-40f1-8b50-4b48dc8a3181",
"title": "Swift GRB231215.41: 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": "23/12/15 11:41:18 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35346"
},
"title": "GCN CIRCULAR",
"number": "35346",
"subject": "Swift GRB231215.41: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the Swift GRB231215.41 (trigger No 1202522,00h 39m 00.00s , +57d 38m 31.2s, R=0.05) errorbox 2511 sec after notice time and 2545 sec after trigger time at 2023-12-15 10:29:50 UT, with upper limit up to 19.6 mag. Observations started at twilight. The observations began at zenith distance = 16 deg. The sun altitude is -13.1 deg.\n\nThe galactic latitude b = -5 deg., longitude l = 122 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#33312\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 2590 | MASTER-Tunka | C | 90 | 19.2 |\n 2625 | MASTER-Tunka | C | 160 | 19.3 | Coadd\n 2769 | MASTER-Tunka | C | 10 | 19.0 |\n 2779 | MASTER-Tunka | C | 30 | 19.4 | Coadd\n 2874 | MASTER-Tunka | C | 220 | 19.5 | Coadd\n 2783 | MASTER-Tunka | C | 10 | 19.1 |\n 2797 | MASTER-Tunka | C | 10 | 19.1 |\n 2816 | MASTER-Tunka | C | 20 | 19.4 |\n 2841 | MASTER-Tunka | C | 70 | 19.6 | Coadd\n 2840 | MASTER-Tunka | C | 20 | 19.3 |\n 2869 | MASTER-Tunka | C | 30 | 19.4 |\n 2903 | MASTER-Tunka | C | 30 | 19.4 |\n 2942 | MASTER-Tunka | C | 40 | 18.7 |\n 2991 | MASTER-Tunka | C | 50 | 18.9 |\n 3051 | MASTER-Tunka | C | 170 | 19.5 | Coadd\n 3050 | MASTER-Tunka | C | 60 | 19.6 |\n 3114 | MASTER-Tunka | C | 60 | 19.6 |\n 3178 | MASTER-Tunka | C | 60 | 19.6 |\n 3242 | MASTER-Tunka | C | 60 | 19.6 |\n 3306 | MASTER-Tunka | C | 60 | 19.5 |\n 3369 | MASTER-Tunka | C | 60 | 19.5 |\n 3433 | MASTER-Tunka | C | 60 | 19.6 |\n 3497 | MASTER-Tunka | C | 60 | 19.6 |\n 3561 | MASTER-Tunka | C | 60 | 19.6 |\n 3625 | MASTER-Tunka | C | 60 | 19.5 |\n 3688 | MASTER-Tunka | C | 60 | 19.5 |\n 3752 | MASTER-Tunka | C | 60 | 19.5 |\n 3816 | MASTER-Tunka | C | 60 | 19.5 |\n 3880 | MASTER-Tunka | C | 60 | 19.5 |\n 3944 | MASTER-Tunka | C | 60 | 19.6 |\n 4008 | MASTER-Tunka | C | 60 | 19.6 |\n 4071 | MASTER-Tunka | C | 60 | 19.6 |\n 4135 | MASTER-Tunka | C | 60 | 19.6 |\n 4200 | MASTER-Tunka | C | 60 | 19.6 |\n 4264 | MASTER-Tunka | C | 60 | 19.6 |\n 4328 | MASTER-Tunka | C | 60 | 19.1 |\n 4392 | MASTER-Tunka | C | 60 | 19.1 |\n 4455 | MASTER-Tunka | C | 60 | 19.1 |\n 4520 | MASTER-Tunka | C | 60 | 19.1 |\n 4583 | MASTER-Tunka | C | 60 | 19.1 |\n 4647 | MASTER-Tunka | C | 60 | 19.1 |\n 4711 | MASTER-Tunka | C | 60 | 19.1 |\n 4775 | MASTER-Tunka | C | 60 | 19.1 |\n 4839 | MASTER-Tunka | C | 60 | 19.1 |\n 4902 | MASTER-Tunka | C | 60 | 19.1 |\n 4966 | MASTER-Tunka | C | 60 | 19.1 |\n 5030 | MASTER-Tunka | C | 60 | 19.1 |\n 5094 | MASTER-Tunka | C | 60 | 19.1 |\n 5157 | MASTER-Tunka | C | 60 | 19.1 |\n 5221 | MASTER-Tunka | C | 60 | 19.1 |\n 5285 | MASTER-Tunka | C | 60 | 19.1 |\n 5349 | MASTER-Tunka | C | 60 | 19.1 |\n 5412 | MASTER-Tunka | C | 60 | 19.1 |\n 5476 | MASTER-Tunka | C | 60 | 19.1 |\n 5541 | MASTER-Tunka | C | 60 | 19.1 |\n 5605 | MASTER-Tunka | C | 60 | 19.1 |\n 5669 | MASTER-Tunka | C | 60 | 19.1 |\n 5732 | MASTER-Tunka | C | 60 | 19.1 |\n 5796 | MASTER-Tunka | C | 60 | 19.1 |\n 5860 | MASTER-Tunka | C | 60 | 19.1 |\n 5924 | MASTER-Tunka | C | 60 | 19.1 |\n 5987 | MASTER-Tunka | C | 60 | 19.1 |\n 6051 | MASTER-Tunka | C | 60 | 19.1 |\n 6115 | MASTER-Tunka | C | 60 | 19.1 |\n 6179 | MASTER-Tunka | C | 60 | 19.1 |\n 6243 | MASTER-Tunka | C | 60 | 19.1 |\n 6307 | MASTER-Tunka | C | 60 | 19.1 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35346.",
"published": "2023-12-15T11:41:29.195190Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T11:41:29.195206Z",
"modified": "2023-12-15T11:41:29.204309Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5318,
"topic": "gcn.circular",
"uuid": "7140ebff-2906-448b-8a5d-a555b62ab0a0",
"title": "GRB 231215C: MASTER OT detection",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "23/12/15 11:42:53 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35347"
},
"title": "GCN CIRCULAR",
"number": "35347",
"subject": "GRB 231215C: MASTER OT detection"
},
"message_text": "V.Lipunov, P.Balanutsa (Lomonosov MSU), O.Gress, N.Budnev (ISU),\nE.Gorbovskoy, D.Svinkin (Ioffe Institute, Konus-Wind),\nYa.Kechin, K.Zhirkov, A.Kuznetsov, D.Vlasenko, P.Balanutsa, Yu.Tselik, N.Tiurina, I.Gorbunov, V.Vladimirov,D.Zimnukhov, V.Senik, A.Yudin,A.Chasovnikov, D.Cheryasov, A.Sosnovskij (Lomonosov MSU,SAI,PhysicsDepartment),\nO.A. Gres, N.M. Budnev (Irkutsk State University, API),\nC.Francile. F. Podesta, R.Podesta (Observatorio Astronomico Felix Aguilar OAFA),\nR. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias),\nA. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),\nA. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity)\n\nMASTER Global robotic net (http://observ.pereplet.ru Lipunov et al.,2010,Advances in Astronomy,2010,30L)\nstarted Swift GRB 231215C ( D'Avanzo et al GCN 35343, Evans et al. GCN35345)\nat 2023-12-15 10:33:29UT (Lipunov et al. GCN 35346)\n\nThere is MASTER OT J003857.44+573850 since first image with mOT\u0016.5 at one of first image, with classical GRB light curve\nObservations and reduction will be continued\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35347.",
"published": "2023-12-15T11:43:00.368590Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T11:43:00.368605Z",
"modified": "2023-12-15T11:43:00.391205Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5319,
"topic": "gcn.circular",
"uuid": "513f07c7-567a-4b95-af6a-cf2a133223bc",
"title": "GRB 231214A: AstroSat CZTI detection",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "23/12/15 12:16:26 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35348"
},
"title": "GCN CIRCULAR",
"number": "35348",
"subject": "GRB 231214A: AstroSat CZTI detection"
},
"message_text": "P. K. Navaneeth (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:\n\nAnalysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long-duration GRB 231214A which was also detected by Fermi-GBM (Fermi GBM Team, GCN Circ. 35334), Swift-BAT (Brivio et al., GCN Circ. 35335), and Fermi-LAT (Kocevski et al., GCN Circ. 35342).\n\nThe source was clearly detected in three of four quadrants of CZT detectors in the 20-200 keV energy range. AstroSat was approaching the South Atlantic Anomaly (SAA) region and hence the background rates were higher. The light curve showed multiple peaks of emission with the strongest peak at 2023-12-14 20:24:41.50 UTC. We limit our analysis to a single quadrant with a relatively stable background. The measured peak count rate associated with the burst is 99 (+28, -12) counts/s above the background in the data of one quadrant (out of four), with a total of 691 (+127, -135) counts. The local mean background count rate was 99 (+2, -2) counts/s. Using cumulative rates, we measure a T90 of 20 (+1, -1) s.\n\nThe source was also 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 2023-12-14 20:24:29.95 UTC. The measured peak count rate associated with the burst is 245 (+84, -30) counts/s above the background in the combined data of all quadrants, with a total of 2761 (+591, -655) counts. The local mean background count rate was 1761 (+8, -9) counts/s. We measure a T90 of 22 (+3, -2) 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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35348.",
"published": "2023-12-15T12:16:37.944210Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T12:16:37.944227Z",
"modified": "2023-12-15T12:16:37.952039Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6687,
"topic": "gcn.circular",
"uuid": "cf519e8a-8a81-409d-88d4-c9c7ef49632b",
"title": "GRB 240418A: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/04/19 15:17:47 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36181"
},
"title": "GCN CIRCULAR",
"number": "36181",
"subject": "GRB 240418A: Swift-XRT refined Analysis"
},
"message_text": "A. Tohuvavohu (U. Toronto), K.L. Page (U. Leicester), A.P. Beardmore\n(U. Leicester), M. Capalbi (INAF-IASFPA), M. Perri (SSDC & INAF-OAR),\nV. D'Elia (SSDC & INAF-OAR), D.N. Burrows (PSU), J. D. Gropp (PSU) and\nP.A. Evans report on behalf of the Swift-XRT team:\n\nWe have analysed 6.1 ks of XRT data for GRB 240418A, from 107 s to 44.9\nks after the BAT trigger. The data comprise 7 s in Windowed Timing\n(WT) mode (taken while Swift was slewing), with the remainder in Photon\nCounting (PC) mode.\n\nThe light curve can be modelled with a power-law decay with a decay\nindex of alpha=2.9 (+0.3, -0.4).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 2.0 (+0.6, -0.4). The\nbest-fitting absorption column is consistent with the Galactic value\nof 5.3 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed\n(unabsorbed) 0.3-10 keV flux conversion factor deduced from this\nspectrum is 3.2 x 10^-11 (3.5 x 10^-11) erg cm^-2 count^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 5 (+/-12) x 10^20 cm^-2\nGalactic foreground: 5.3 x 10^20 cm^-2\nExcess significance: <1.6 sigma\nPhoton index:\t 2.0 (+0.6, -0.4)\n\nIf the light curve continues to decay with a power-law decay index of\n2.9, the count rate at T+24 hours will be 1.2 x 10^-8 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.8 x\n10^-19 (4.1 x 10^-19) erg cm^-2 s^-1.\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/01222885.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36181.",
"published": "2024-04-19T15:18:01.563008Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-19T15:18:01.563020Z",
"modified": "2024-04-19T15:18:01.569177Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5320,
"topic": "gcn.circular",
"uuid": "e1f3523f-669b-4918-a5dc-23812f8ae8c7",
"title": "GRB 231215A: Mondy optical bright afterglow detection",
"submitter": "Hop gcn.circular",
"authors": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"data": {
"date": "23/12/15 12:55:34 GMT",
"from": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35349"
},
"title": "GCN CIRCULAR",
"number": "35349",
"subject": "GRB 231215A: Mondy optical bright afterglow detection"
},
"message_text": "N. Pankov (HSE, IKI), A. Pozanenko (IKI), E. Klunko (ISTP), S. Belkin (IKI) report on behalf of GRB IKI FuN:\n\nWe observed the field of Swift GRB 231215A (D'Avanzo et al., GCN 35343; Evans et al., GCN 35345) with AZT-33IK telescope of Mondy observatory in R-filter starting on 2023-12-15 (UT) 11:17:39. Preliminary photometry of the fist immaes reveals a new bright source within XRT error circle (Evans et al., GCN 35345)\n\nDate UT start t-T0 Exp. Filter OT Err.\n (mid, days) (s)\n2023-12-15 11:17:39 0.063363 1x120 R 17.42 0.07\n\nThe photometry is based on nearby USNO-B1.0 R2 stars.\n\nWe also may suggest that GCN 35347 (Lipunov et al.) refer to the afterglow of GRB 231215A.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35349.",
"published": "2023-12-15T12:55:46.170535Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T12:55:46.170552Z",
"modified": "2023-12-15T12:55:46.179746Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5321,
"topic": "gcn.circular",
"uuid": "0deb8f97-6d77-4778-ac77-4e552c6e6bc5",
"title": "GRB 231214A: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/12/15 13:27:53 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35350"
},
"title": "GCN CIRCULAR",
"number": "35350",
"subject": "GRB 231214A: Swift-XRT refined Analysis"
},
"message_text": "J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), M. Perri (SSDC &\nINAF-OAR), V. D'Elia (SSDC & INAF-OAR), B. Sbarufatti (INAF-OAB), A.\nTohuvavohu (U. Toronto), D.N. Burrows (PSU), J. D. Gropp (PSU), A.P.\nBeardmore (U. Leicester) and P.A. Evans report on behalf of the\nSwift-XRT team:\n\nWe have analysed 6.2 ks of XRT data for GRB 231214A, from 407 s to 45.5\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=1.48 (+/-0.08).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 2.4 (+/-0.4). The\nbest-fitting absorption column is 1.2 (+0.4, -0.3) x 10^22 cm^-2, in\nexcess of the Galactic value of 5.5 x 10^20 cm^-2 (Willingale et al.\n2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion\nfactor deduced from this spectrum is 4.2 x 10^-11 (1.2 x 10^-10) erg\ncm^-2 count^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 1.2 (+0.4, -0.3) x 10^22 cm^-2\nGalactic foreground: 5.5 x 10^20 cm^-2\nExcess significance: 5.4 sigma\nPhoton index:\t 2.4 (+/-0.4)\n\nIf the light curve continues to decay with a power-law decay index of\n1.48, the count rate at T+24 hours will be 1.6 x 10^-3 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 6.9 x\n10^-14 (1.9 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/01202386.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35350.",
"published": "2023-12-15T13:28:03.465728Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T13:28:03.465743Z",
"modified": "2023-12-15T13:28:03.473965Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5322,
"topic": "gcn.circular",
"uuid": "facde2e0-8999-4300-9e48-8b60d15d0129",
"title": "GRB 231215A : MITSuME Akeno optical afterglow candidate detection",
"submitter": "Hop gcn.circular",
"authors": "Mahito Sasada at Tokyo Institute of Technology <sasada@hp.phys.titech.ac.jp>",
"data": {
"date": "23/12/15 13:31:43 GMT",
"from": "Mahito Sasada at Tokyo Institute of Technology <sasada@hp.phys.titech.ac.jp>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35351"
},
"title": "GCN CIRCULAR",
"number": "35351",
"subject": "GRB 231215A : MITSuME Akeno optical afterglow candidate detection"
},
"message_text": "M. Sasada, N. Higuchi, I. Takahashi, M. Niwano, S. Sato, S. Hayatsu, H. Takei, H. Seki, Y. Yatsu and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:\n\nWe observed the field of GRB 231215A (D'Avanzo et al., GCN 35343) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope Akeno. \n\nThe observation with a series of 10 sec exposures started at 2023-12-15 09:50:27 UT (182 seconds after the Swift/BAT trigger). We stacked the first six images. An optical candidate of the afterglow can be found at the location of (RA, Dec) = (9.7393, 57.6472) near the Swift/XRT error position (Evans et al., GCN 35345). Here we report magnitudes by the aperture photometry at the position.\n\nT0+[sec] | MID-UT | T-EXP[sec] | magnitudes of aperture photometry\n----------------------------------------------------------------------------------------------------------------\n238 | 2023-12-15 09:51:23 | 60 | gâ=17.54+/-0.06, Rc=17.86+/-0.05, Ic=17.40+/-0.05\n----------------------------------------------------------------------------------------------------------------\nT0+ : Elapsed time after the trigger\nT-EXP: Total Exposure time\n\nThe magnitudes are consistent with Lipunov et al., GCN 35347 and Pankov et al., GCN 35349. We are continuing to observe the candidate.\n\nWe used the PS1 catalog for flux calibration. The catalog magnitudes in PS1 g, r and i bands were converted to our g'-, Rc- and Ic-band magnitudes following Tonry et al. (2012), Table 6. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al. 2021, PASJ, Vol.73, Issue 1, Pages 4-24; https://github.com/MNiwano/Eclaire).\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35351.",
"published": "2023-12-15T13:31:49.941976Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T13:31:49.941990Z",
"modified": "2023-12-15T13:31:49.947258Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5328,
"topic": "gcn.circular",
"uuid": "e0698451-462f-4d6e-8dbd-f7a48a73a7fa",
"title": "GRB 231215A: Enhanced Swift-XRT position",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/12/15 16:29:06 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35357"
},
"title": "GCN CIRCULAR",
"number": "35357",
"subject": "GRB 231215A: Enhanced Swift-XRT position"
},
"message_text": "M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester)\nreport on behalf of the Swift-XRT team.\n\nUsing 1725 s of XRT Photon Counting mode data and 4 UVOT\nimages for GRB 231215A, 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 = 9.73958, +57.64793 which is equivalent\nto:\n\nRA (J2000): 00h 38m 57.50s\nDec (J2000): +57d 38' 52.6\"\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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35357.",
"published": "2023-12-15T16:29:18.866532Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T16:29:18.866547Z",
"modified": "2023-12-15T16:29:18.871564Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5323,
"topic": "gcn.circular",
"uuid": "dc012275-eefd-4049-9293-4bcadd112f64",
"title": "GRB 231215A: AstroSat CZTI detection",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"data": {
"date": "23/12/15 14:11:50 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35352"
},
"title": "GCN CIRCULAR",
"number": "35352",
"subject": "GRB 231215A: AstroSat CZTI detection"
},
"message_text": "P. K. Navaneeth (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:\n\nAnalysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a bright long-duration GRB 231215A which was also detected by Swift-BAT (D'Avanzo et al., GCN Circ. 35343), and Fermi-GBM (Fermi GBM Team, GCN Circ. 35344).\n\nThe source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve showed two peaks of emission with the strongest peak at 2023-12-15 09:47:26.50 UTC. The measured peak count rate associated with the burst is 775 (+59, -30) counts/s above the background in the combined data of three quadrants (out of four), with a total of 8196 (+334, -292) counts. The local mean background count rate was 267 (+3, -3) counts/s. Using cumulative rates, we measure a T90 of 15 (+1, -1) s. In the preliminary analysis, we find 1372 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 two peaks of emission with the strongest peak at 2023-12-15 09:47:25.92 UTC. The measured peak count rate associated with the burst is 2162 (+110, -46) counts/s above the background in the combined data of all quadrants, with a total of 22784 (+686, -737) counts. The local mean background count rate was 1465 (+6, -7) counts/s. We measure a T90 of 14 (+1, -2) 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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35352.",
"published": "2023-12-15T14:12:01.526333Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T14:12:01.526351Z",
"modified": "2023-12-15T14:12:01.535030Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5324,
"topic": "gcn.circular",
"uuid": "1ea1c1ab-7726-4f38-a1e0-d5018b0fef9d",
"title": "GRB 231215A : Nanshan/HMT optical observations",
"submitter": "Hop gcn.circular",
"authors": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
"data": {
"date": "23/12/15 14:32:20 GMT",
"from": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35353"
},
"title": "GCN CIRCULAR",
"number": "35353",
"subject": "GRB 231215A : Nanshan/HMT optical observations"
},
"message_text": "J. An, X. Liu, S.Q. Jiang, S.Y. Fu, 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 231215A detected by Swift (D'Avanzo et al., GCN 35343) using the HMT-0.5m telescope located at Nanshan, Xinjiang, China. Observations started at 11:51:08 UT on 2023-12-15, i.e., 2.06 hr after the BAT trigger. A series of 90, 120, 200 s frames without any filter have been obtained and observations are ongoing.\n\nPreliminary analysis of the initial frames shows that the previously reported optical afterglow (e.g., Pankov et al., GCN 35349; Sasada et al., GCN 35351) has decayed to m(r) = 18.3 +/- 0.1 mag at 2.19 hr post-burst, calibrated with the nearby PanSTAR field in the Sloan r-filter and the magnitude is not corrected for Galactic extinction.\n\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35353.",
"published": "2023-12-15T14:32:30.855705Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T14:32:30.855722Z",
"modified": "2023-12-15T14:32:30.863523Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5329,
"topic": "gcn.circular",
"uuid": "94f2027b-e116-407c-9521-573de2ce7d10",
"title": "ATCA observations of GRB 231210B",
"submitter": "Hop gcn.circular",
"authors": "Lauren Rhodes at Oxford <lauren.rhodes@physics.ox.ac.uk>",
"data": {
"date": "23/12/15 16:40:25 GMT",
"from": "Lauren Rhodes at Oxford <lauren.rhodes@physics.ox.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35358"
},
"title": "GCN CIRCULAR",
"number": "35358",
"subject": "ATCA observations of GRB 231210B"
},
"message_text": "L. Rhodes (Oxford), G. E. Anderson (Curtin), A. J. van der Horst (GWU), J. K. Leung (UofT/HUJI), O. Sharan Salafia (INAF), S. D. Ryder (Macquarie), A. Gulati (USyd), S. Chastain (UNM) on behalf of the PanRadio GRB collaboration\n\nWe observed short GRB 231210B (Page et al., GCN 35314) starting at 2023-12-14 10:56UT for 9 hours with the Australia Telescope Compact Array (ATCA), as part of the \"PanRadio GRB\" Large ATCA follow-up programme C3542 (PI. Anderson).\n\nWe do not detect any clear radio counterpart. The rms noise in our observations is 17 and 12 uJy/beam at 5.5 and 9GHz, respectively. At a redshift of 3.13 (Saccardi et al GCN 35317), our measurements correspond to 3-sigma upper limits of 6.6e30 and 4.7e30 erg/s/Hz at 5.5 and 9GHz, respectively (assuming H0 = 70km/s/Mpc and OmegaM = 0.3)\n\nWe thank the CSIRO Space and Astronomy staff for supporting these observations.\nWe acknowledge the Gomeroi people as the traditional owners of the Observatory site. The Australia Telescope Compact Array is part of the Australia Telescope National Facility (https://ror.org/05qajvd42) which is funded by the Australian Government for operation as a National Facility managed by CSIRO.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35358.",
"published": "2023-12-15T16:40:36.161060Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T16:40:36.161075Z",
"modified": "2023-12-15T16:40:36.167952Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5330,
"topic": "gcn.circular",
"uuid": "91841c15-e9d6-49cd-9f1d-1e24cd7b1d6c",
"title": "Konus-Wind detection of GRB 231210B",
"submitter": "Hop gcn.circular",
"authors": "Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>",
"data": {
"date": "23/12/15 16:58:32 GMT",
"from": "Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35359"
},
"title": "GCN CIRCULAR",
"number": "35359",
"subject": "Konus-Wind detection of GRB 231210B"
},
"message_text": "D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin,\nA. Tsvetkova, M. Ulanov, and T. Cline,\non behalf of the Konus-Wind team, report:\n\nThe long GRB 231210B (Swift detection: Page et al., GCN 35314)\ntriggered Konus-Wind (KW) at T0=77347.988 s UT (21:29:07.988).\n\nThe burst light curve shows a multi-peaked structure\nwith a total duration of of ~9 s.\nThe emission is seen up to ~0.5 MeV.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB231210_T77347/\n\nAs observed by Konus-Wind, the burst had\na total fluence of (4.02 ± 0.56)x10^-6 erg/cm^2 and\na 64-ms peak energy flux, measured from T0+2.944 s,\nof (2.19 ± 0.32)x10^-6 erg/cm^2/s (both in the 20 keV - 10 MeV energy range).\n\nThe time-integrated spectrum of the burst (measured from T0 to T0+8.448 s)\nis best fit in the 20 keV - 15 MeV range by a power law with exponential\ncutoff (CPL) model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)\nwith alpha = -0.62(-0.37,+0.44) and Ep = 174(-27,+40) keV (chi2 = 65/87 dof).\nFitting this spectrum by a Band function yields the same values of alpha and Ep,\nand an upper limit on the high energy photon index beta of -2.5 (chi2 = 65/86 dof).\n\nAssuming the redshift z=3.13 (Saccardi et al., GCN 35317)\nand a standard cosmology with H_0 = 67.3 km/s/Mpc, Omega_M = 0.315,\nand Omega_Lambda = 0.685 (Planck Collaboration, 2014),\nwe estimate the burst isotropic energy release E_iso to (8.8 ± 1.3)x10^52 erg,\nthe isotropic peak luminosity L_iso to (2.0 ± 0.3)x10^53 erg/s,\nthe rest-frame peak energy of the spectrum Ep,z to ~720 keV.\nWith the obtained estimates, GRB 231210B is inside 90% prediction band for\nthe 'Amati' relation and inside 68% prediction band for the 'Yonetoku' relation\nderived for the sample of >300 long KW GRBs with known redshifts\n(Tsvetkova et al., 2017; Tsvetkova et al., 2021), see\nhttp://www.ioffe.ru/LEA/GRBs/GRB231210_T77347/GRB231210B_rest_frame.pdf\n\nAll the quoted errors are estimated at the 68% confidence level.\nAll the presented results are preliminary.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35359.",
"published": "2023-12-15T16:58:43.106004Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T16:58:43.106020Z",
"modified": "2023-12-15T16:58:43.114924Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5325,
"topic": "gcn.circular",
"uuid": "c0ddc87b-4dc3-44f2-9d9c-fb96c5491c1e",
"title": "GRB 231215A: GROWTH-India optical follow-up",
"submitter": "Hop gcn.circular",
"authors": "Vishwajeet Swain at IIT Bombay <vishwajeet.s@iitb.ac.in>",
"data": {
"date": "23/12/15 15:35:12 GMT",
"from": "Vishwajeet Swain at IIT Bombay <vishwajeet.s@iitb.ac.in>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35354"
},
"title": "GCN CIRCULAR",
"number": "35354",
"subject": "GRB 231215A: GROWTH-India optical follow-up"
},
"message_text": "Y. Wagh, R. Kumar, V. Swain, A. Salgundi, V. Bhalerao (IIT Bombay), G. C. Anupama, S. Barway (IIA), K. Angail (IAO)\n\nWe observed the field of GRB 231215A detected by Swift (D'Avanzo et al., GCN Circ. 35343) with 0.7m GROWTH-India Telescope (GIT). We started the observation at 2023-12-15 13:48:10.312 UT, i.e., 4.01 hours after the Swift trigger. We obtained multiple images in the r' and g' filters. We clearly detected the afterglow near the uncertainty radius of Swift-XRT position reported by P.A. Evans et al., GCN Circ. 35345 and are consistent with the coordinate reported by M. Sasada at al., GCN Circ. 35351. The photometry results follow as:\n\n------------------------------------------------------------------------\n\n| JD (mid) | t-t0 (hours) | Filter | Exposure (s) | Magnitude (AB) |\n\n------------------------------------------------------------------------\n\n| 2460294.07510789 | 4.008 | r' | 380 | 19.65 +/- 0.08 |\n| 2460294.08452486 | 4.248 | g' | 380 | 20.44 +/- 0.11 |\n\n------------------------------------------------------------------------\n\nThe results are consistent to the values reported by V.Lipunov et al., GCN Circ. 35347; N. Pankov et al., GCN Circ. 35349; M. Sasada et al., GCN Circ. 35351; J. An et al., GCN Circ. 35353. 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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35354.",
"published": "2023-12-15T15:35:29.900792Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T15:35:29.900809Z",
"modified": "2023-12-15T15:35:29.915329Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5326,
"topic": "gcn.circular",
"uuid": "ee1f953f-6e2e-40cb-b052-7a690f656024",
"title": "GRB 231214A: REM optical/NIR upper limits",
"submitter": "Hop gcn.circular",
"authors": "Matteo Ferro <matteo.ferro@inaf.it>",
"data": {
"date": "23/12/15 16:02:09 GMT",
"from": "Matteo Ferro <matteo.ferro@inaf.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35355"
},
"title": "GCN CIRCULAR",
"number": "35355",
"subject": "GRB 231214A: REM optical/NIR upper limits"
},
"message_text": "M. Ferro, R. Brivio, P. D'Avanzo, S. Covino, D. Fugazza (INAF-OAB) on behalf of the REM team, report:\n\nWe observed the field of GRB 231214A (Brivio et al., GCN 35335) with the REM 60cm robotic telescope located at the ESO Observatory of La Silla (Chile). The observations were carried out in the g,r,i,z, J,H,K bands, starting on 2023 Dec 15 at 00:39:27 UT (i.e. about 4.25 hours after the Swift trigger) and lasted for about 1 hour.\nFrom preliminary analysis, we do not find any source at the enhanced XRT position (Evans et al., GCN 35341), down the the following 3 sigma upper limits:\n\nr > 20.1 (AB; calibrated against the SkyMapper catalogue)\nat a mid time of t-t0 ~ 4.92 h after the GRB trigger;\n\nH > 17.7 (Vega; calibrated against the 2MASS catalogue)\nat a mid time of t-t0 ~ 4.68 h after the GRB trigger.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35355.",
"published": "2023-12-15T16:02:21.786782Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T16:02:21.786797Z",
"modified": "2023-12-15T16:02:21.794032Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5327,
"topic": "gcn.circular",
"uuid": "9995f17f-cf80-46f1-82d0-e94cb863215f",
"title": "Fermi trigger No 724326442: 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": "23/12/15 16:16:07 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35356"
},
"title": "GCN CIRCULAR",
"number": "35356",
"subject": "Fermi trigger No 724326442: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB231215.41 (trigger No 724326442,00h 44m 14.40s , +61d 13m 48.0s, R=1) errorbox 22709 sec after notice time and 22743 sec after trigger time at 2023-12-15 16:06:21 UT, with upper limit up to 18.3 mag. The observations began at zenith distance = 19 deg. The sun altitude is -26.4 deg.\n\nThe galactic latitude b = -1 deg., longitude l = 122 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#33321\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 22774 | 2023-12-15 16:06:21 | MASTER-Kislovodsk | (00h 34m 57.11s , +61d 52m 12.8s) | C | 60 | 18.1 |\n 22854 | 2023-12-15 16:07:41 | MASTER-Kislovodsk | (00h 22m 23.77s , +60d 33m 26.0s) | C | 60 | 18.3 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35356.",
"published": "2023-12-15T16:16:18.475923Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T16:16:18.475939Z",
"modified": "2023-12-15T16:16:18.485283Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6480,
"topic": "gcn.circular",
"uuid": "5109016e-8115-44a6-93db-6d20b0d18902",
"title": "GRB 240411B: OHP/T193 optical observations",
"submitter": "Hop gcn.circular",
"authors": "Benjamin Schneider at MIT <bschn@mit.edu>",
"data": {
"date": "24/04/12 05:38:40 GMT",
"from": "Benjamin Schneider at MIT <bschn@mit.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36067"
},
"title": "GCN CIRCULAR",
"number": "36067",
"subject": "GRB 240411B: OHP/T193 optical observations"
},
"message_text": "B. Schneider (MIT), C. Adami (LAM/Pytheas/AMU), E. Le Flocâh (CEA Paris-Saclay), A. Saccardi (GEPI/Obs. de Paris) report on behalf of a larger collaboration:\n\nWe observed the field of the GRB 240411B (Parsotan et al., GCN 36063; Goad et al., GCN 36065) and its afterglow candidate (Izzo et al., GCN 36064) using the T193cm telescope at Observatoire de Haute-Provence (France) equipped with the MISTRAL spectro-imager. A total of 10 exposures (8x600s + 2x720s) were obtained in the r-band at 00:44:01.5 UT on 2024-04-12 (~9.2h after the trigger). In the combined frame, we detect a source consistent with the optical afterglow reported by Izzo et al. (GCN 36064).\n\nThe preliminary magnitude derived for that source is\n\nr = 23.1 +/- 0.3 mag (AB)\n\nThe photometric calibration was performed using nearby stars from the PanSTARRS catalog and the magnitude is not corrected for Galactic extinction.\n\nWe acknowledge the excellent support from Observatoire de Haute-Provence and in particular Jean-Pierre Troncin for the MISTRAL observations.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36067.",
"published": "2024-04-12T05:39:00.331163Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-12T05:39:00.331178Z",
"modified": "2024-04-12T05:39:00.345407Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5335,
"topic": "gcn.circular",
"uuid": "2fcd3c39-df3a-43e3-a4ec-9e773e030c41",
"title": "GRB 231214A: Fermi GBM observation",
"submitter": "Hop gcn.circular",
"authors": "sumanbala2210@gmail.com",
"data": {
"date": "23/12/15 18:56:47 GMT",
"from": "sumanbala2210@gmail.com",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35360"
},
"title": "GCN CIRCULAR",
"number": "35360",
"subject": "GRB 231214A: Fermi GBM observation"
},
"message_text": "S. Bala (USRA) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 20:24:24.68 UT on 14 December 2023, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 231214A (trigger 724278269 / 231214850),\nwhich was also detected by the Swift/BAT (Brivio et al. 2023, GCN 35335),\nFermi-LAT (Kocevski et al. 2023, GCN 35342) and AstroSat CZTI (Navaneeth et al.\nGCN 35348). The Fermi GBM Final Real-time Localization (GCN 35334) is consistent\nwith the Swift position.\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 50.0 degrees.\n\nThe GBM light curve consists of two distinct peaks\nwith a duration (T90) of about 21 s (50-300 keV).\nThe time-averaged spectrum from T0-0.5 s to T0+26.1 s is\nbest fit by a Band function with Epeak = 142.5 +/- 5 keV,\nalpha = -0.46 +/- 0.05, and beta = -2.5 +/- 0.1.\n\nThe event fluence (10-1000 keV) in this time interval is\n(2.25 +/- 0.05)E-5 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+16.12 s in the 10-1000 keV band\nis 22.24 +/- 1.77 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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35360.",
"published": "2023-12-15T18:56:59.102775Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T18:56:59.102790Z",
"modified": "2023-12-15T18:56:59.108112Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5336,
"topic": "gcn.circular",
"uuid": "81dfb409-5685-45e7-bae7-80be6b3b24d7",
"title": "GRB 231215A: AGILE detection",
"submitter": "Hop gcn.circular",
"authors": "Francesco Verrecchia at SSDC,INAF-OAR <francesco.verrecchia@ssdc.asi.it>",
"data": {
"date": "23/12/15 20:12:46 GMT",
"from": "Francesco Verrecchia at SSDC,INAF-OAR <francesco.verrecchia@ssdc.asi.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35361"
},
"title": "GCN CIRCULAR",
"number": "35361",
"subject": "GRB 231215A: AGILE detection"
},
"message_text": "F. Verrecchia (SSDC, and INAF/OAR), C. Casentini (INAF/IAPS), C.\nPittori (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma\nTor Vergata), A. Argan, M. Cardillo, Y. Evangelista, L. Foffano,\nG. Piano (INAF/IAPS), L. Baroncelli, A. Bulgarelli, A. Ciabattoni,\nA. Di Piano, V. Fioretti (INAF/OAS-Bologna), G. Panebianco (Univ.\nBologna - INAF/OAS Bologna), N. Parmiggiani (INAF/OAS-Bologna),\nF. Lucarelli (SSDC, and INAF/OAR), P.W. Cattaneo (INFN Pavia), F.\nLongo (Univ. Trieste, and INFN Trieste), M. Marisaldi\n(INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois\n(INAF/OA-Cagliari), A. Ursi (ASI and INAF/IAPS), I. Donnarumma,\nE. Menegoni (ASI), A. Giuliani (INAF/IASF-Mi), F. Cutrona (Univ.\nMilano Bicocca) and P. Tempesta (TeleSpazio) report on behalf of\nthe AGILE Team:\n\nThe AGILE satellite detected the GRB 231215A at T0 = 2023-12-15\n09:47:17.8 s (UTC), reported by Swift (GCNs #35343, #35345, #35357),\nMondy (GCN #35349), MITSuME (GCN #35351), Astrosat (GCN #35352),\nHMT (GCN #35353), GROWTH (GCN #35354).\n\nThe event lasted about 12 s and it released a total number of 10990\ncounts in the MCAL detector RM (above a background rate of 548 Hz)\nand 49280 counts in the AC-Top detector RM (above a background\nrate of 2741 Hz). The AGILE ratemeters light curves can be\nfound at\n\nhttp://www.agilescienceapp.it/notices/GRB231215A_AGILE_RM_ND.png .\n\nThe event also triggered a high time resolution MCAL data acquisition,\nfrom T0-22 s s to T0+10 s (UTC), and released 8436 counts in the\ndetector, above a background rate of 510 Hz.\nThe MCAL light curve can be found at\n\nhttp://www.agilescienceapp.it/notices/GRB231215A_086695_629718437.810000.png .\n\nAt the T0, the event was 148 deg off-axis.\nAdditional analysis of AGILE data is in progress. Automatic MCAL GRB\nalert Notices can be found at: https://gcn.gsfc.nasa.gov/agile_mcal.html\n\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35361.",
"published": "2023-12-15T20:12:58.411089Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T20:12:58.411105Z",
"modified": "2023-12-15T20:12:58.417578Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5337,
"topic": "gcn.circular",
"uuid": "fce4125a-eae3-44af-be63-a9bdf63aaafd",
"title": "GRB 231215A: AKO Optical Upper Limit",
"submitter": "Hop gcn.circular",
"authors": "Mohammad Odeh at Al Khatim Observatory M44 <mshodeh@gmail.com>",
"data": {
"date": "23/12/15 21:33:00 GMT",
"from": "Mohammad Odeh at Al Khatim Observatory M44 <mshodeh@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35362"
},
"title": "GCN CIRCULAR",
"number": "35362",
"subject": "GRB 231215A: AKO Optical Upper Limit"
},
"message_text": "Mohammad Odeh (Al-Khatim Observatory, AKO, operated by the International\nAstronomical Center in Abu Dhabi, UAE), and Dalya Akl (American University\nof Sharjah, UAE), report:\n\nWe used our 0.36m f/7.7 robotic telescope to observe the field of GRB\n231215A, which was detected by Swift (D'Avanzo et al., GCN 35343), and its\noptical counterpart was detected by (Pankov et al., GCN 35349; Sasada et\nal., GCN 35351; An et al., GCN 35353; Wagh et al., GCN 35354).\n\nThe observation was done on 15 December starting at 20:07:36 UT, which\ncorresponds to 10.34 hours after the GRB trigger time, using an (Ic)\nfilter. We obtained 17x180s images, and we didn't detect a credible source\nwithin the uncertainty radius of the Swift-XRT position (Goad et al., GCN.\n35357).\n\nThe following 5-sigma upper limit is calculated using the ATLAS catalog as\na reference:\nIc = 18.8\nThe magnitude is not corrected for Galactic extinction.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35362.",
"published": "2023-12-15T21:33:13.041565Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T21:33:13.041584Z",
"modified": "2023-12-15T21:33:13.048871Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5338,
"topic": "gcn.circular",
"uuid": "215f5af3-9745-4b6f-97fa-3c8840961668",
"title": "GRB 231215A: BOOTES-4/MET optical detection",
"submitter": "Hop gcn.circular",
"authors": "Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>",
"data": {
"date": "23/12/15 21:36:53 GMT",
"from": "Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35363"
},
"title": "GCN CIRCULAR",
"number": "35363",
"subject": "GRB 231215A: BOOTES-4/MET optical detection"
},
"message_text": "Y.-D. Hu, E. Fernandez-Garcia, I. Perez-Garcia, M.D. Caballero-Garcia, R. Sanchez-Ramirez, S. Guziy, S.-Y. Wu and A. J. Castro-Tirado (IAA-CSIC, Granada), C. Perez del Pulgar, A. Castellon, I. Carrasco (Univ. de Malaga) and D. R. Xiong, Y. F. Fan, J. M. Bai, C. J. Wang, Y. X. Xin, X. H. Zhao (Yunnan Observatories of CAS) on behalf of a larger collaboration, report:\n\nFollowing the detection of GRB 231215A by Swift (D'Avanzo et al. GCNC 35343) and AGILE (Verrecchia et al. GCNC 35361), the 0.6m BOOTES-4/MET robotic telescope at Lijiang Astronomical Observatory (China) automatically responded to this burst starting on Dec. 15 at 14:11 UT (~4.4 hrs after trigger). A series of images in clear filter were gathered and the optical afterglow was detected within the enhanced Swift/XRT position (Goad et al. GCNC 35357) for which we measure a magnitude of 19.91 +- 0.14 on the co-added 60 s x 15 image, which is consistent with the detections of MASTER (Lipunov et al. GCNC 35347), Mondy (Pankov et al. GCNC 34349), MITSuME (Sasada et al. GCNC 35351), Nanshan/HMT (An et al. GCNC 35353) and GROWTH-India (Wagh et al. GCNC 35354). Further imaging is ongoing.\n\nWe thank the staff at Lijiang observatory for their excellent support.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35363.",
"published": "2023-12-15T21:37:01.596226Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T21:37:01.596241Z",
"modified": "2023-12-15T21:37:01.606781Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5339,
"topic": "gcn.circular",
"uuid": "02df701d-0562-4f4e-847b-0a90e19a0cbb",
"title": "GRB 231215A: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/12/15 22:14:28 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35364"
},
"title": "GCN CIRCULAR",
"number": "35364",
"subject": "GRB 231215A: Swift-XRT refined Analysis"
},
"message_text": "K.L. Page (U. Leicester), V. D'Elia (SSDC & INAF-OAR), B. Sbarufatti\n(INAF-OAB), C. Salvaggio (INAF-OAB), D.N. Burrows (PSU), J. D. Gropp\n(PSU), S. Dichiara (PSU), A.P. Beardmore (U. Leicester) and P.A. Evans\nreport on behalf of the Swift-XRT team:\n\nWe have analysed 6.7 ks of XRT data for GRB 231215A, from 2.7 ks to\n33.0 ks after the BAT trigger. The data are entirely in Photon\nCounting (PC) mode.\n\nThe light curve can be modelled with a power-law decay with a decay\nindex of alpha=1.95 (+0.10, -0.09).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 1.89 (+0.20, -0.13). The\nbest-fitting absorption column is 4.40 (+1.19, -0.15) x 10^21 cm^-2,\nconsistent with the Galactic value of 4.2 x 10^21 cm^-2 (Willingale et\nal. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux\nconversion factor deduced from this spectrum is 4.2 x 10^-11 (6.3 x\n10^-11) erg cm^-2 count^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 4.40 (+1.19, -0.15) x 10^21 cm^-2\nGalactic foreground: 4.2 x 10^21 cm^-2\nExcess significance: <1.6 sigma\nPhoton index:\t 1.89 (+0.20, -0.13)\n\nIf the light curve continues to decay with a power-law decay index of\n1.95, the count rate at T+24 hours will be 1.9 x 10^-3 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 8.1 x\n10^-14 (1.2 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/01202522.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35364.",
"published": "2023-12-15T22:14:40.106477Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T22:14:40.106495Z",
"modified": "2023-12-15T22:14:40.114639Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5340,
"topic": "gcn.circular",
"uuid": "f5f9bbd0-9e90-486b-8969-a9511d08da61",
"title": "LIGO/Virgo/KAGRA S231215i: 3 counterpart neutrino candidate events from an IceCube neutrino search",
"submitter": "Hop gcn.circular",
"authors": "acz2122@columbia.edu",
"data": {
"date": "23/12/15 22:31:26 GMT",
"from": "acz2122@columbia.edu",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35365"
},
"title": "GCN CIRCULAR",
"number": "35365",
"subject": "LIGO/Virgo/KAGRA S231215i: 3 counterpart neutrino candidate events from an IceCube neutrino search"
},
"message_text": "IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nWe have performed a search for track-like muon neutrino events detected by IceCube consistent with the sky localization of the low-significance gravitational-wave candidate event S231215i in a time range of 1000 seconds centered on the alert event time (2023-12-15T02:22:01 UTC to 2023-12-15T02:38:41 UTC) [1,2]. During this time period IceCube was collecting good quality data. A single hypothesis test was conducted using a Bayesian approach to quantify the joint GW + neutrino event significance, which assumes a binary merger scenario and accounts for known astrophysical priors, such as GW source distance, in the statistical significance estimation [3].\n\nThree track-like events are found in spatial and temporal coincidence with the gravitational-wave candidate S231215i calculated from the map circulated in the S231215i-2-Preliminary notice, although not in coincidence with each other. This represents an overall p-value of 0.0039 for the Bayesian search. The p-value measures the consistency of the observed track-like events with the known atmospheric backgrounds for this single map (not accounting for statistical trials from multiple GW events).\n\nFurther details are available at https://gcn.nasa.gov/missions/icecube and at https://roc.icecube.wisc.edu/public/LvkNuTrackSearch.\n\nProperties of the coincident events are shown below:\n\n dt(s) RA(deg) Dec(deg) Angular uncertainty(deg) p-value(Bayesian)\n-------------------------------------------------------------------------------------\n-199.53 311.05 +33.46 2.774 0.0063\n-153.98 223.68 +7.51 1.723 0.0304\n-322.42 220.21 +25.97 1.374 0.0398\n\nwhere:\ndt = Time of track event minus time of GW trigger (sec)\nAngular uncertainty = Angular uncertainty of track event: the radius of a circle\n representing 90% CL containment by area.\np-value = the p-value for this specific track event from this search.\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the\ngeographic South Pole, Antarctica. The IceCube realtime alert point of contact can be\nreached at roc@icecube.wisc.edu\n\n[1] M. G. Aartsen et al 2020 ApJL 898 L10\n[2] Abbasi et al. Astrophys.J. 944 (2023) 1, 80\n[3] I. Bartos et al. 2019 Phys. Rev. D 100, 083017\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35365.",
"published": "2023-12-15T22:31:37.968620Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T22:31:37.968635Z",
"modified": "2023-12-15T22:31:37.975571Z",
"nonlocalizedevents": [
{
"event_id": "S231215i"
}
],
"targets": []
},
{
"id": 5341,
"topic": "gcn.circular",
"uuid": "89765e08-78d9-428a-ba43-bb55e2c91440",
"title": "GRB 231215A: Swift/UVOT Detection",
"submitter": "Hop gcn.circular",
"authors": "Paul Kuin at MSSL <npkuin@gmail.com>",
"data": {
"date": "23/12/15 22:38:34 GMT",
"from": "Paul Kuin at MSSL <npkuin@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35366"
},
"title": "GCN CIRCULAR",
"number": "35366",
"subject": "GRB 231215A: Swift/UVOT Detection"
},
"message_text": "N. P. M. Kuin (UCL-MSSL) and P. D'Avanzo (INAF-OAB)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 231215A\n2733 s after the BAT trigger (D'Avanzo et al., GCN Circ. 35343).\nA source consistent with the XRT position (Goad et al., GCN Circ. 35357)\nis detected in the initial UVOT exposures. The burst was also detected\nby Fermi GBM (GCN Circ. 35344),Astrosat CZTI (Navaneeth et al., GCN\nCirc. 35352), and in the optical by Master (Lipunov et al., 35347),\nMONDY (Pankov et al. GCN Circ. 35349), MITSume Akeno (Sasada et al.,\nGCN Circ. 35351), GROWTH-India (Wagh et al., GCN Circ 35354), BOOTES-4/MET\n(Hu et al., GCN Circ 35363), HMT-Nanshang (An et al. GCN Circ. 35353) and\nan upper limit from AKO (Odeh, GCN Circ. 36362).\n\nThe preliminary UVOT position is:\n RA (J2000) = 00:38:57.52 = 9.73967 (deg.)\n Dec (J2000) = +57:38:50.5 = 57.64735 (deg.)\nwith an estimated uncertainty of 0.45 arc sec. (radius, 90% confidence).\n\nPreliminary detections and 3-sigma upper limits using the UVOT photometric\nsystem\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures\nare:\n\nFilter T_start(s) T_stop(s) Exp(s) Mag\n\nwhite 2733 2883 147 18.10 +/- 0.05\nv 3713 3912 197 17.48 +/- 0.08\nb 3096 3296 197 18.63 +/- 0.09\nu 2891 3091 197 18.17 +/- 0.10\nw1 4124 4323 197 19.57 +/- 0.31\nm2 3918 4117 197 >19.4\nw2 3507 3707 197 >19.5\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.506 in the direction of the burst\n(Schlegel et al. 1998).\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35366.",
"published": "2023-12-15T22:38:45.688834Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T22:38:45.688850Z",
"modified": "2023-12-15T22:38:45.694104Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5342,
"topic": "gcn.circular",
"uuid": "1453605a-ce93-479d-8681-2279a018724f",
"title": "GRB 231215A : OHP/T193 optical afterglow detection",
"submitter": "Hop gcn.circular",
"authors": "Damien Turpin at CEA-Saclay <dturpin-astro@hotmail.com>",
"data": {
"date": "23/12/15 22:40:38 GMT",
"from": "Damien Turpin at CEA-Saclay <dturpin-astro@hotmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35367"
},
"title": "GCN CIRCULAR",
"number": "35367",
"subject": "GRB 231215A : OHP/T193 optical afterglow detection"
},
"message_text": "D. Turpin (CEA Paris-Saclay), C. Adami (LAM), E. Le Floc'h, D. Götz, F. Schüssler (CEA Paris-Saclay), B. Schneider (MIT), S. Basa (Pytheas/OHP/LAM), A. Saccardi, S. D. Vergani (GEPI, Obs. de Paris), report on behalf of a larger collaboration:\n\nWe observed the field of the long GRB 231215A (D'Avanzo et al., GCN 35343) and its afterglow candidate (Evans et al. GCN 35345) using the T193cm telescope at Observatoire de Haute-Provence (France) equipped with the MISTRAL instrument. A total of 5 images were taken in r-band (total exposure = 3000s) and 3 others in the g-band (total exposure = 2100s) starting at 17:13:33.32 UT on 2023-12-15, ~7.43h after the trigger.\n\nIn the combined frames, we clearly detect the optical afterglow reported by Lipunov et al. GCN 35347, Pankov et al. GCN 35349, Sasada et al. GCN 35351, An et al. GCN 35353, Wagh et al. GCN 35354, Hu et al. GCN 35363. The preliminary magnitude derived are the following:\n\n-----------------------------------------------\nT-T0 (in days, midtime) | mag | filter\n-----------------------------------------------\n0.3302 | 21.32 ± 0.10 mag (AB) | r'\n0.3795 | 21.76 ± 0.07 mag (AB) | g'\n-----------------------------------------------\n\nThe photometric calibration was performed using nearby stars from the PanSTARRS catalog and magnitudes are not corrected for Galactic extinction.\n\nOur results are compatibe with the fading behavior observed in previous GCN (Lipunov et al. GCN 35347, Pankov et al. GCN 35349, Sasada et al. GCN 35351, An et al. GCN 35353, Wagh et al. GCN 35354, Ferro et al. GCN 35355, Hu et al. GCN 35363). We note that the afterglow flux decay is steep with a temporal index alpha ~ 1.9. We encourage further follow-up observation with large telescopes to better characterize the flux and spectral evolution of this afterglow.\n\nWe acknowledge the excellent support from Observatoire de Haute-Provence, in particular Jean Balcaen for the MISTRAL observations and the SOPHIE observer Clément Ranc.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35367.",
"published": "2023-12-15T22:40:48.843769Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-15T22:40:48.843786Z",
"modified": "2023-12-15T22:40:48.849122Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5345,
"topic": "gcn.circular",
"uuid": "f5a8fc82-678e-4db5-8cad-01bfbcd1159e",
"title": "GRB 231215A: CALET Gamma-Ray Burst Monitor detection",
"submitter": "Hop gcn.circular",
"authors": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"data": {
"date": "23/12/16 03:33:37 GMT",
"from": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35368"
},
"title": "GCN CIRCULAR",
"number": "35368",
"subject": "GRB 231215A: CALET Gamma-Ray Burst Monitor detection"
},
"message_text": "N. Cannady (GSFC/UMBC), A. Yoshida, T. Sakamoto,\nS. Sugita (AGU), Y. Kawakubo (LSU), K. Yamaoka (Nagoya U),\nS. Nakahira (JAXA), Y. Asaoka (ICRR), S. Torii, Y. Akaike,\nK. Kobayashi (Waseda U), T. Tamura, Y. Shimizu (Kanagawa U),\nM. L. Cherry (LSU), S. Ricciarini (U of Florence),\nP. S. Marrocchesi (U of Siena),\nand the CALET collaboration:\n\nThe long GRB 231215A (Swift detection of a burst: D'Avanzo et al.,\nGCN Circ. 35343; AstroSat CZTI detection: Navaneeth et al.,\nGCN Circ. 35352; AGILE detection: Verrecchia et al., GCN Circ.\n35361) triggered the CALET Gamma-ray Burst Monitor\n(CGBM) at 09:47:15.26 UTC on 15 December 2023\n(http://cgbm.calet.jp/cgbm_trigger/flight/1386668712/).\nThe burst signal was seen by all CGBM detectors.\n\nThe burst light curve shows a multi-peaked structure that starts\nat T+1.5 sec, peaks at T+10.4 sec, and ends at T+20.4 sec.\nThe T90 and T50 durations measured by the SGM data are\n15.2 +/- 1.3 sec and 5.6 +/- 0.2 sec (40-1000 keV), respectively.\n\nThe ground-processed light curve is available at\n\nhttp://cgbm.calet.jp/cgbm_trigger/ground/1386668712/index.html\n\nThe CALET data used in this analysis are provided by\nthe Waseda CALET Operation Center located at Waseda University.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35368.",
"published": "2023-12-16T03:33:52.096569Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-16T03:33:52.096585Z",
"modified": "2023-12-16T03:33:52.104991Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6486,
"topic": "gcn.circular",
"uuid": "7831c4cf-74b7-45af-a856-d8a0827e82d4",
"title": "GRB 240411A: GRBAlpha detection",
"submitter": "Hop gcn.circular",
"authors": "Andras Pal at Konkoly Observatory <apal@szofi.net>",
"data": {
"date": "24/04/12 10:39:32 GMT",
"from": "Andras Pal at Konkoly Observatory <apal@szofi.net>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36068"
},
"title": "GCN CIRCULAR",
"number": "36068",
"subject": "GRB 240411A: GRBAlpha detection"
},
"message_text": "A. Pal (Konkoly Observatory), J. Ripa, M. Dafcikova, M. Kolar, N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, M. Duriskova, L. Szakszonova, J.-P. Breuer, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration.\n\nThe short-duration GRB 240411A (Fermi/GBM detection: GCN 36061; INTEGRAL/SPI-ACS peak detection at 2024-04-11 ~01:45:00 UT) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023, A&A, 677, 40; https://ui.adsabs.harvard.edu/abs/2023A%26A...677A..40P/abstract).\n\nThe sub-threshold detection was confirmed at the peak time 2024-04-11 01:45:00.0 UTC. The T90 duration measured by GRBAlpha is 1.0 s and the significance at the peak time reaches 4 sigma in the ~120-400 keV band.\n\nThe light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB240411A_GCN.pdf\n\nAll GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/hea/GRBAlpha/\n\nGRBAlpha, launched on 2021 March 22, is a demonstration mission for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~50 keV to ~1000 keV. To increase the duty cycle and the downlink rate, the upgrade of the on-board data acquisition software stack is in progress. The ground segment is also supported by the radio amateur community and it takes advantage of the SatNOGS network for increased data downlink volume. \n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36068.",
"published": "2024-04-12T10:39:50.249939Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-12T10:39:50.249955Z",
"modified": "2024-04-12T10:39:50.260041Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5350,
"topic": "gcn.circular",
"uuid": "b96c68aa-8850-4319-be94-f991f7414469",
"title": "GRB 231215A: Fermi GBM observation",
"submitter": "Hop gcn.circular",
"authors": "Elisabetta Bissaldi at Politecnico and INFN Bari <elisabetta.bissaldi@ba.infn.it>",
"data": {
"date": "23/12/16 07:57:56 GMT",
"from": "Elisabetta Bissaldi at Politecnico and INFN Bari <elisabetta.bissaldi@ba.infn.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35369"
},
"title": "GCN CIRCULAR",
"number": "35369",
"subject": "GRB 231215A: Fermi GBM observation"
},
"message_text": "E. Bissaldi (Politecnico and INFN Bari), P. Veres (UAH) and C. Meegan (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\n\"At 09:47:17.81 UT on 15 December 2023, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 231215A (trigger 724326442 / 231215408),\nwhich was also detected by the Swift/BAT (D'Avanzo et al. 2023, GCN 35343).\nThe GBM on-ground location is consistent with the Swift position.\nWe note that the burst was automatically named incorrectly (GRB 231215B, GCN 35344),\nlikely because the GBM trigger differs from the BAT trigger by 8 s.\n\nThe angle from the Fermi LAT boresight\nat the GBM trigger time is 111 degrees.\n\nThe GBM light curve consists of a single bright pulse\nwith a duration (T90) of about 16 s (50-300 keV).\nThe time-averaged spectrum from T0-1.8 s to T0+32 s is\nbest fit by a power law function with an exponential\nhigh-energy cutoff. The power law index is 0.73 +/- 0.02 and\nthe cutoff energy, parameterized as Epeak, is 761 +/- 22 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(7.15 +/- 0.05)E-5 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+7.5 s in the 10-1000 keV band\nis 20.3 +/- 0.4 ph/s/cm^2.\n\nA Band function fits the spectrum equally well\nwith Epeak= 759 +/- 23 keV, alpha = -0.73 +/- 0.02\nand beta = 4.7 +/- 1.4.\n\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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35369.",
"published": "2023-12-16T07:58:11.934769Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-16T07:58:11.934788Z",
"modified": "2023-12-16T07:58:11.942944Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5351,
"topic": "gcn.circular",
"uuid": "43d562e5-dfb1-4abd-958a-cd53ac222999",
"title": "GRB 231215A: GAD Observatory, La Spezia, Italy upper limit;",
"submitter": "Hop gcn.circular",
"authors": "Claudio Lopresti <cl3lop@gmail.com>",
"data": {
"date": "23/12/16 11:12:34 GMT",
"from": "Claudio Lopresti <cl3lop@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35370"
},
"title": "GCN CIRCULAR",
"number": "35370",
"subject": "GRB 231215A: GAD Observatory, La Spezia, Italy upper limit;"
},
"message_text": "Claudio Lopresti (Gruppo Astronomia Digitale - GAD Observatory, La Spezia, Italy) in collaboration with:\nM.G. Dainotti (National Astronomical Observatory of Japan), Y. Niino (Tokyo University, Institute of Astronomy), K. Kalinowski (Aarhus University, Department of Physics and Astronomy), B. De Simone (Universita' degli Studi Di Salerno), Unione Astrofili Italiani (UAI)\nreport:\n\nWe imaged the field of GRB 231215A (trigger=1202522) with the telescope LX200 12â of GAD Observatory, La Spezia, Italy\nMember of:\nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili, GRB section.\nGAD - Gruppo Astronomia Digitale.\n\nThe observations started 551 min after the GRB trigger, with a Shmidt-Cassegrain telescope D=304 mm with reducer F/D=4.75.\n\nWeather conditions were medium.\nThe observation with a series of 60 sec exposures started at 2023-12-15 18:58:47 UT \n\nWe co-added 230 exposures of 60 sec each.\n\nStart T0+ End T0+ R lim\n551 min 815 min 17,99\n\nWe did not found any optical counterpart in 00:38:58.02 +57:38:47.2 position and in the error box of the XRT candidate.\nref.: P. D'Avanzo et al. GCN 35343, P.A. Evans et al. GCN 35345\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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35370.",
"published": "2023-12-16T11:12:48.162899Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-16T11:12:48.162915Z",
"modified": "2023-12-16T11:12:48.171382Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5352,
"topic": "gcn.circular",
"uuid": "6fbebd40-b3de-424d-bccc-fe94ffa10e0f",
"title": "GRB 231204A: VZLUSAT-2 detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "23/12/16 11:17:21 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35371"
},
"title": "GCN CIRCULAR",
"number": "35371",
"subject": "GRB 231204A: VZLUSAT-2 detection"
},
"message_text": "M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), H. Takahashi (Hiroshima U.), F. Munz , M. Topinka, F. Hroch, N. Husarikova, J.-P. Breuer (Masaryk U.), J. Hudec, J. Kapus, M. Frajt, M. Rezenov (Spacemanic s.r.o), R. Laszlo (Needronix), G. Galgoczi (Wigner Research Center/Eotvos U.), N. Uchida (ISAS/JAXA), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), Y. Fukazawa, K. Hirose, H. Matake (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), K. Torigoe (Hiroshima U.), P. Svoboda, V. Daniel, J. Dudas, M. Junas, J. Gromes (VZLU), I. Vertat (FEL ZCU) -- the VZLUSAT-2/GRB payload collaboration.\n\nThe long duration GRB 231204A (Fermi/GBM detection: GCN 35258; AstroSat detection: GCN 35267; CALET/CGBM detection: GCN 35272; Glowbug detection: GCN 35274; Konus/WIND detection at 2023-12-04 20:00:04.344 UT; INTEGRAL/SPI-ACS peak detection at 2023-12-04 ~20:00:05 UT) was detected by the GRB detectors on board of the VZLUSAT-2 3U CubeSat (https://www.vzlusat2.cz/en/).\n\nThe data acquisition was performed by the GRB detector units no. 0 and no. 1. The detection was confirmed at the peak time 2023-12-04 20:00:07 UTC. The T90 duration is 5 s and the significance during T90 reaches 6 sigma (10 sigma) for detector unit no. 0 (no. 1).\n\nThe light curve obtained by VZLUSAT-2 is available here:\nhttps://vzlusat2.konkoly.hu/static/share/GRB231204A_GCN_VZLUSAT2.pdf\n\nAll VZLUSAT-2 detections are listed at: https://monoceros.physics.muni.cz/hea/VZLUSAT-2/\nThe GRB detectors on VZLUSAT-2 are a demonstration payload for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). Two GRB modules of VZLUSAT-2 are placed in a perpendicular manner and each consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~30 keV to ~1000 keV. VZLUSAT-2 was launched on 2022 January 13 from Cape Canaveral.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35371.",
"published": "2023-12-16T11:17:29.620452Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-16T11:17:29.620468Z",
"modified": "2023-12-16T11:17:29.625730Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5353,
"topic": "gcn.circular",
"uuid": "64739c68-1259-489a-88fa-587d527125ce",
"title": "GRB 231205B: VZLUSAT-2 detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "23/12/16 11:18:20 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35372"
},
"title": "GCN CIRCULAR",
"number": "35372",
"subject": "GRB 231205B: VZLUSAT-2 detection"
},
"message_text": "M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), H. Takahashi (Hiroshima U.), F. Munz , M. Topinka, F. Hroch, N. Husarikova, J.-P. Breuer (Masaryk U.), J. Hudec, J. Kapus, M. Frajt, M. Rezenov (Spacemanic s.r.o), R. Laszlo (Needronix), G. Galgoczi (Wigner Research Center/Eotvos U.), N. Uchida (ISAS/JAXA), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), Y. Fukazawa, K. Hirose, H. Matake (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), K. Torigoe (Hiroshima U.), P. Svoboda, V. Daniel, J. Dudas, M. Junas, J. Gromes (VZLU), I. Vertat (FEL ZCU) -- the VZLUSAT-2/GRB payload collaboration.\n\nThe long duration GRB 231205B (Swift/BAT detection: GCN 35269; GECAM-B detection: GCN 35279; AGILE detection: GCN 35295; Konus/WIND detection at 2023-12-05 16:43:58.336 UT) was detected by the GRB detectors on board of the VZLUSAT-2 3U CubeSat (https://www.vzlusat2.cz/en/).\n\nThe data acquisition was performed by the GRB detector units no. 0 and no. 1. The detection was confirmed at the peak time 2023-12-05 16:43:57 UTC. The T90 duration is 31 s (29 s) and the significance during T90 reaches 14 sigma (12 sigma) for detector unit no. 0 (no. 1).\n\nThe light curve obtained by VZLUSAT-2 is available here:\nhttps://vzlusat2.konkoly.hu/static/share/GRB231205B_GCN_VZLUSAT2.pdf\n\nAll VZLUSAT-2 detections are listed at: https://monoceros.physics.muni.cz/hea/VZLUSAT-2/\nThe GRB detectors on VZLUSAT-2 are a demonstration payload for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). Two GRB modules of VZLUSAT-2 are placed in a perpendicular manner and each consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~30 keV to ~1000 keV. VZLUSAT-2 was launched on 2022 January 13 from Cape Canaveral.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35372.",
"published": "2023-12-16T11:18:27.698301Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-16T11:18:27.698317Z",
"modified": "2023-12-16T11:18:27.705289Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5354,
"topic": "gcn.circular",
"uuid": "1805cc1f-9ca7-40c6-9242-a91f142c5e82",
"title": "GRB 231215A: Redshift from OSIRIS+ / GTC",
"submitter": "Hop gcn.circular",
"authors": "Christina Thöne at ASU-CAS <christina.thoene@gmail.com>",
"data": {
"date": "23/12/16 12:43:06 GMT",
"from": "Christina Thöne at ASU-CAS <christina.thoene@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35373"
},
"title": "GCN CIRCULAR",
"number": "35373",
"subject": "GRB 231215A: Redshift from OSIRIS+ / GTC"
},
"message_text": "C. C. Thoene (ASU-CAS), A. de Ugarte Postigo (CNRS/OCA and LAM), J. F. Agui Fernandez (CAHA), L. Izzo (INAF/Capodimonte), J. P. U. Fynbo (DAWN/NBI), N. R. Tanvir (U. Leicester), M. Blazek (CAHA), S. Geier, A. Cabrera-Lavers, Fabricio Perez Toledo and Miguel Rivero (all GTC) report:\n \nWe obtained spectroscopy of the afterglow of GRB 231215A (DâAvanzo et al. GCN 35343, Evans et al. GCN 35345, Pankov et al. GCN 35349) with OSIRIS+ at the 10.4m GTC at a mean epoch of 0.4958 days after the GRB. The observation consisted of 3x900s exposures with grism R1000B, covering the range between 3700 and 7780 AA at a resolving power of about 600.\n\nThe spectrum shows a strong but reddened continuum with multiple absorption features. The highest redshift features include Lyman alpha, SII 1250,53,59, SiII1260, 1304, OI1302, CII 1334, SiIV1393, 1402, CIV 1548, 1550, AlII1670, FeII 1608, 1611 at a common redshift of z=2.305. We also identify fine structure lines of SiII* 1264 and 1309 at the same redshift, which we hence assume as the redshift of the GRB. Additionally, we detect two intervening systems, at z=2.076 showing CIV and SiIV absorption and at z=0.574 showing the MgII 2796, 2803 doublet.\n\nWe thank the GTC staff for excellent support. This GRB reached Earth on the name's day of the first author. \n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35373.",
"published": "2023-12-16T12:43:19.714953Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-16T12:43:19.714970Z",
"modified": "2023-12-16T12:43:19.722415Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6487,
"topic": "gcn.circular",
"uuid": "d4d75689-68cf-4427-864a-d923fcb0947b",
"title": "GRB 240411B: 1.3m DFOT Optical observations",
"submitter": "Hop gcn.circular",
"authors": "Amit Kumar Ror at ARIES <mitturor77894@gmail.com>",
"data": {
"date": "24/04/12 10:52:24 GMT",
"from": "Amit Kumar Ror at ARIES <mitturor77894@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36069"
},
"title": "GCN CIRCULAR",
"number": "36069",
"subject": "GRB 240411B: 1.3m DFOT Optical observations"
},
"message_text": "Amit K. Ror, Anshika Gupta, Rahul Gupta, Amar Aryan, Saurabh, and Shashi B.\nPandey (ARIES) report:\n\n\nWe observed the field of GRB 240411B detected by Swift (Parsotan et al.,\n2024 GCN 36063) with the 1.3m Devasthal Fast Optical Telescope (DFOT),\nlocated at the Devasthal Observatory of the Aryabhatta Research Institute\nof Observational Sciences (ARIES), India. The observations were started on\n2024-04-11 at 19:06:28 UT, i.e., ~ 3.56 hours after the BAT trigger. We\nhave taken multiple frames with an exposure time of 300 s in the R filter.\nWe stacked the images after the alignment. We clearly detected an optical\nafterglow (Izzo et al., 2024, GCN 36064; Schneider et al., 2024, GCN 36067)\nin our final stacked image within the error box of enhanced Swift-XRT\nobservation (Goad et al., 2024, GCN 36065). The estimated preliminary\nmagnitude is as follows:\n\n\nDate Start_UT T_start-T0 (hours) Filter Exp time (s) Limiting magnitude\n\n======================================================\n2024-04-11 19:06:28 UT 3.56 R 300*15 22.34 +/- 0.11\n\n\nThe detection of the afterglow is consistent with the observations of Izzo\net al. 2024, GCN 36064, and Schneider et al. 2024, GCN 36067.\n\n\nThe given magnitude value is not corrected for the Galactic and host\nextinctions in the direction of the GRB afterglow. Photometric calibration\nis performed using the standard stars from the USNO-B1.0 catalog. This\ncircular may be cited.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36069.",
"published": "2024-04-12T10:52:41.428840Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-12T10:52:41.428854Z",
"modified": "2024-04-12T10:52:41.434663Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5357,
"topic": "gcn.circular",
"uuid": "92e5b232-1431-4acc-957b-9496dd401635",
"title": "GRB 231214A: Swift/UVOT Upper Limits",
"submitter": "Hop gcn.circular",
"authors": "Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>",
"data": {
"date": "23/12/16 13:23:14 GMT",
"from": "Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35374"
},
"title": "GCN CIRCULAR",
"number": "35374",
"subject": "GRB 231214A: Swift/UVOT Upper Limits"
},
"message_text": "A. A. Breeveld (UCL-MSSL) and Brivio (INAF-OAB) report on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 231214A (Fermi GBM Team, GCN Circ. 35334; Kocevski et al., GCN Circ. 35342; Navaneeth et al., GCN Circ. 35348), 442 s after the BAT trigger (Brivio et al., GCN Circ. 35335).\nNo optical afterglow consistent with the XRT position (Evans et al., GCN Circ. 35341) 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 initial exposures are:\n\nFilter     T_start(s)  T_stop(s)    Exp(s)     Mag\n\nwhite        442     4733      382     >20.7\nv         4944     4998      54     >18.1\nb         4329     4528      197     >19.6\nu         4123     4322      197     >19.3\nw2         4739     4939      197     >19.5\n\nThe magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.060 in the direction of the burst (Schlegel et al. 1998).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35374.",
"published": "2023-12-16T13:23:24.874743Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-16T13:23:24.874767Z",
"modified": "2023-12-16T13:23:24.883399Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6792,
"topic": "gcn.circular",
"uuid": "b71a31f6-6616-4733-86b5-9d213eb2f129",
"title": "EP240420a: TNT upper limit to its optical counterpart",
"submitter": "Hop gcn.circular",
"authors": "Wenxiong Li <liwenxiong1992@gmail.com>",
"data": {
"date": "24/04/21 14:20:00 GMT",
"from": "Wenxiong Li <liwenxiong1992@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36210"
},
"title": "GCN CIRCULAR",
"number": "36210",
"subject": "EP240420a: TNT upper limit to its optical counterpart"
},
"message_text": "J. Mo, X. F. Wang, H. W. Peng (THU), X. Li (BJP), Y. G. Sun, W. X. Li (NAOC) report the optical follow-up observations of EP240420a (Zhang et al., GCN 36194, Han et al., GCN 36203). These observations were conducted on 2024 April 20.75 UT in g and r bands, at ~4 hours after the EP-WXT detection, using the 80-cm Tsinghua-NAOC Telescope (TNT) located at Xinglong Observatory, Hebei Province, China. No optical counterpart candidates were detected.\nThe 3-sigma upper limits are reported as below:\ng ~ 21.6 mag\nr ~ 21.9 mag\nFurther followup observations are encouraged.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36210.",
"published": "2024-04-21T14:20:14.758755Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-21T14:20:14.758771Z",
"modified": "2024-04-21T14:20:14.766424Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6492,
"topic": "gcn.circular",
"uuid": "507db646-f49c-48ba-905f-ccf0f847280c",
"title": "IceCube-240412A - IceCube observation of a high-energy neutrino candidate track-like event",
"submitter": "Hop gcn.circular",
"authors": "A. Zegarelli at Ruhr University Bochum <azegarelli@icecube.wisc.edu>",
"data": {
"date": "24/04/12 13:28:22 GMT",
"from": "A. Zegarelli at Ruhr University Bochum <azegarelli@icecube.wisc.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36070"
},
"title": "GCN CIRCULAR",
"number": "36070",
"subject": "IceCube-240412A - IceCube observation of a high-energy neutrino candidate track-like event"
},
"message_text": "The IceCube Collaboration (http://icecube.wisc.edu/) reports:\n\nOn 2024-04-12 05:33:46.89 UT IceCube detected a track-like event with a moderate probability of being of astrophysical origin. The event was selected by the ICECUBE_Astrotrack_Bronze alert stream. The average astrophysical neutrino purity for Gold alerts is 30%. This alert has an estimated false alarm rate of 3.4096 events per year due to atmospheric backgrounds. The IceCube detector was in a normal operating state at the time of detection.\n\nAfter the initial automated alert (https://gcn.gsfc.nasa.gov/notices_amon_g_b/139279_10803235.amon) more sophisticated reconstruction algorithms have been applied offline, with the direction refined to:\n\nDate: 2024-04-12\nTime: 05:33:46.89 UT\nRA: 102.44 (+1.09, -0.67 deg 90% PSF containment) J2000\nDec: 6.35 (+0.60, -0.46 deg 90% PSF containment) J2000\n\nWe encourage follow-up by ground and space-based instruments to help identify a possible astrophysical source for the candidate neutrino.\n\nThere are no Fermi 4FGL or 3FHL catalog sources in the 90% uncertainty region. The nearest gamma-ray source in either catalog is 4FGL J0658.6+0636 at RA: 104.66 deg and Dec: 6.61 deg (2.2 deg away from the best-fit position).\n\nThe IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36070.",
"published": "2024-04-12T13:28:38.208708Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-12T13:28:38.208722Z",
"modified": "2024-04-12T13:28:38.214741Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5363,
"topic": "gcn.circular",
"uuid": "a6601482-c6fb-4eb5-b9ee-ea0430d3d821",
"title": "GRB 231215A: NOT optical observations",
"submitter": "Hop gcn.circular",
"authors": "Zipei Zhu at NAOC <zpzhu@nao.cas.cn>",
"data": {
"date": "23/12/16 16:50:36 GMT",
"from": "Zipei Zhu at NAOC <zpzhu@nao.cas.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35375"
},
"title": "GCN CIRCULAR",
"number": "35375",
"subject": "GRB 231215A: NOT optical observations"
},
"message_text": "Z. Zhu, J. An, D. Xu (NAOC), D. B. Malesani (DAWN/NBI), L. Izzo (INAF/Capodimonte), A. de Ugarte Postigo (CNRS/OCA and LAM), Z. Gray (NOT) report on behalf a large collaboration:\n\nWe observed the optical afterglow of GRB 231215A detected by Swift/BAT (DâAvanzo et al., GCN 35343, Evans et al., GCN 35345, Pankov et al., GCN 35349), using the 2.56-m Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observations started at 20:23:33 UT on 2023-12-15, i.e., 10.6 hr after the BAT trigger. We obtained 2x120 s in the Sloan r-band and then 2x1800 s spectroscopy.\n\nThe previously reported optical counterpart (e.g., Lipunov et al., GCN 35347, Pankov et al., GCN 35349, Sasada et al., GCN 35351, An et al., GCN 35353, Wagh et al., GCN 35354, Hu et al., GCN 35363, Turpin et al., GCN 35367) was clearly detected in our stacked image with m(r) = 21.21 +/- 0.03 at 10.64 hr post-burst, calibrated with nearby Pan-STARRS stars.\n\nHowever, the S/N of the spectrum is quite low. The spectrum shows a rather flat and featureless continuum. No unambiguous absorption feature can be identified at the reported GTC redshift (Thoene et al., GCN 35373).\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35375.",
"published": "2023-12-16T16:50:48.802903Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-16T16:50:48.802918Z",
"modified": "2023-12-16T16:50:48.808283Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5365,
"topic": "gcn.circular",
"uuid": "92fcf0f8-f048-4a96-9fcc-e471178ce229",
"title": "GRB 231215A: optical afterglow detection from the INAF Asiago Observatory",
"submitter": "Hop gcn.circular",
"authors": "Paolo D'Avanzo at INAF-OAB <pda.davanzo@gmail.com>",
"data": {
"date": "23/12/16 18:18:47 GMT",
"from": "Paolo D'Avanzo at INAF-OAB <pda.davanzo@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35376"
},
"title": "GCN CIRCULAR",
"number": "35376",
"subject": "GRB 231215A: optical afterglow detection from the INAF Asiago Observatory"
},
"message_text": "A. Reguitti (INAF-OAB / INAF-OAPd), P. D'Avanzo (INAF-OAB), L. Tomasella (INAF -OAPd), E. Cappellaro (INAF -OAPd),\nreport on behalf of the CIBO and of the GRAWITA collaborations:\n\nWe carried out follow-up optical observations of GRB 231215A (D'Avanzo et al., GCN Circ. 35343; Navaneeth et al. GCN Circ. 35352;\nVerrecchia et al. GCN Circ. 35361; Cannady et al., GCN Circ. 35368; Bissaldi et al., GCN Circ. 35369) from the INAF - Padova Astronomical\nObservatory located in Asiago (Italy) with the 67/92 Schmidt telescope starting on 2023-12-15 at 16:45:00 UT (~ 7.0 hours after the burst)\nwith the clear filter.\n\nIn our stacked image the optical afterglow (Lipunov et al., GCN Circ. 35347, Pankov et al., GCN Circ. 35349, Sasada et al., GCN Circ. 35351,\nAn et al., GCN Circ. 35353, Wagh et al., GCN Circ. 35354, Hu et al., GCN Circ. 35363; Kuin et al., GCN Circ. 35366; Turpin et al., GCN Circ.\n35367; Zhu et al., GCN Circ. 35375) is detected.\nFrom preliminary analysis we estimate a magnitude of 21.2 +/- 0.2 (AB; calibrated against r band of the PanSTARRS catalog).\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35376.",
"published": "2023-12-16T18:18:58.418884Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-16T18:18:58.418899Z",
"modified": "2023-12-16T18:18:58.425267Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5366,
"topic": "gcn.circular",
"uuid": "07e54a7b-b5e9-4208-81b9-85d1bd64a7e0",
"title": "Konus-Wind detection of GRB 231215A",
"submitter": "Hop gcn.circular",
"authors": "Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>",
"data": {
"date": "23/12/16 18:27:11 GMT",
"from": "Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35377"
},
"title": "GCN CIRCULAR",
"number": "35377",
"subject": "Konus-Wind detection of GRB 231215A"
},
"message_text": "D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin,\nA. Tsvetkova, M. Ulanov, and T. Cline,\non behalf of the Konus-Wind team, report:\n\nThe long, bright GRB 231215A (Swift detection: D'Avanzo et al., GCN 35343;\nAstroSat CZTI detection: Navaneeth et al., GCN 35352;\nCALET Gamma-Ray Burst Monitor detection: Cannady et al., GCN 35368;\nAGILE detection: Verrecchia et al., GCN 35361;\nFermi GBM detection: Lesage et al., GCN 35369)\ntriggered Konus-Wind (KW) at T0=35239.795 s UT (09:47:19.795).\n\nThe burst light curve shows a single multi-peaked pulse,\nwhich starts at ~T0-1 s, peaks at ~T0+9.5 s,\nand has a total duration of ~25 s.\nThe emission is seen up to ~10 MeV.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB231215_T35239/\n\nAs observed by Konus-Wind, the burst had\na fluence of (1.02 ± 0.09)x10^-4 erg/cm^2 and\na 64-ms peak energy flux, measured from T0 + 28.352 s,\nof (1.14 ± 0.12)x10^-5 erg/cm^2/s (both in the 20 keV - 10 MeV energy range).\n\nThe time-integrated spectrum (measured from T0 to T0+24.320 s)\nis best fit in the 20 keV - 15 MeV range\nby a GRB (Band) function with the following model parameters:\nthe low-energy photon index alpha = -0.67 (-0.07,+0.08),\nthe high energy photon index beta = -2.49 (-0.43,+0.22),\nthe peak energy Ep = 612 (-63,+74) keV,\nchi2 = 80/97 dof.\n\nThe spectrum near the peak count rate (measured from T0+6.400s to T0+9.984s)\nis best fit in the 20 keV - 15 MeV range\nby a GRB (Band) function with the following model parameters:\nthe low-energy photon index alpha = -0.49 (-0.09,+0.09),\nthe high energy photon index beta = -3.07 (-2.04,+0.44),\nthe peak energy Ep = 582 (-54,+58) keV,\nchi2 = 69/80 dof.\n\nAssuming the redshift z=2.305 (Thoene et al., GCN 35373)\nand a standard cosmology with H_0 = 67.3 km/s/Mpc, Omega_M = 0.315,\nand Omega_Lambda = 0.685 (Planck Collaboration, 2014),\nwe estimate the burst isotropic energy release E_iso to (1.35 ± 0.12)x10^54 erg,\nthe isotropic peak luminosity L_iso to (4.93 ± 0.49)x10^53 erg/s,\nthe rest-frame peak energy of the time-integrated spectrum Ep,i,z to ~2023 keV,\nand the rest-frame peak energy at the peak of the emission Ep,p,z to ~1924 keV.\nWith the obtained estimates, GRB 230818A is inside 68% prediction band for\nboth 'Amati' and 'Yonetoku' relations derived for the sample of >300 long\nKW GRBs with known redshifts (Tsvetkova et al., 2017; Tsvetkova et al., 2021),\nsee http://www.ioffe.ru/LEA/GRBs/GRB231215_T35239/GRB231215A_rest_frame.pdf\n\nAll the quoted errors are estimated at the 68% confidence level.\nAll the presented results are preliminary.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35377.",
"published": "2023-12-16T18:27:23.186757Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-16T18:27:23.186771Z",
"modified": "2023-12-16T18:27:23.191999Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5367,
"topic": "gcn.circular",
"uuid": "21ff047a-1c65-4694-a1df-f3024b9aad8e",
"title": "GRB 231216A: Swift detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "Tullia Sbarrato at INAF-OAB <tullia.sbarrato@inaf.it>",
"data": {
"date": "23/12/16 18:56:07 GMT",
"from": "Tullia Sbarrato at INAF-OAB <tullia.sbarrato@inaf.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35378"
},
"title": "GCN CIRCULAR",
"number": "35378",
"subject": "GRB 231216A: Swift detection of a burst"
},
"message_text": "\nT. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB), S. Dichiara (PSU),\nM. Ferro (INAF-OAB), J.D. Gropp (PSU), S. Laha (GSFC/UMBC),\nM. J. Moss (GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL),\nB. Sbarufatti (INAF-OAB) and M. H. Siegel (PSU) report on behalf of\nthe Neil Gehrels Swift Observatory Team:\n\nAt 18:35:42 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 231216A (trigger\u001202749). Swift slewed immediately to the burst.\nThe BAT on-board calculated location is\nRA, Dec 39.759, +33.596 which is\n RA(J2000) = 02h 39m 02s\n Dec(J2000) = +33d 35' 45\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including\nsystematic uncertainty). The BAT light curve showed a complex\nstructure with a duration of about 70 sec. The peak count rate\nwas ~2000 counts/sec (15-350 keV), at ~0 sec after the trigger.\n\nThe XRT began observing the field at 18:37:53.1 UT, 131.1 seconds after\nthe BAT trigger. Using promptly downlinked data we find a fading,\nuncatalogued X-ray source located at RA, Dec 39.77287, 33.57671 which\nis equivalent to:\n RA(J2000) = 02h 39m 05.49s\n Dec(J2000) = +33d 34' 36.2\"\nwith an uncertainty of 3.9 arcseconds (radius, 90% containment). This\nlocation is 80 arcseconds from the BAT onboard position, within the BAT\nerror circle. This position may be improved as more data are received;\nthe latest position is available at https://www.swift.ac.uk/sper.\n\nA power-law fit to a spectrum formed from promptly downlinked event\ndata gives a column density consistent with the Galactic value of 8.36\nx 10^20 cm^-2 (Willingale et al. 2013).\n\nUVOT took a finding chart exposure of 250 seconds with the U filter starting\n191 seconds after the BAT trigger. No credible afterglow candidate has been\nfound in the initial data products. The 2.7'x2.7' sub-image covers 33% of the\nXRT error circle. The typical 3-sigma upper limit has been about 19.2 mag.\nResults from the list of sources generated on-board are not available at this\ntime. No correction has been made for the expected extinction corresponding to\nE(B-V) of 0.081.\n\nBurst Advocate for this burst is T. Sbarrato (tullia.sbarrato AT inaf.it).\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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35378.",
"published": "2023-12-16T18:56:17.391648Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-16T18:56:17.391663Z",
"modified": "2023-12-16T18:56:17.396999Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5368,
"topic": "gcn.circular",
"uuid": "04d1c51e-ae11-45d6-b36c-3b44e7016669",
"title": "Swift GRB231216.77: 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": "23/12/16 18:57:11 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35379"
},
"title": "GCN CIRCULAR",
"number": "35379",
"subject": "Swift GRB231216.77: Global MASTER-Net observations report"
},
"message_text": "V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,\nG.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile\n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley\n(South African Astronomical Observatory),\n\nO.A. Gress, N.M. Budnev, O.Ershova\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,\nA.R.Corella, L.H.Rodriguez\n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich\n(Blagoveschensk Educational State University)\n\nMASTER-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 GRB231216.77 (trigger No 1202749,02h 39m 02.16s , +33d 35m 45.6s, R=0.05) errorbox 47 sec after notice time and 382 sec after trigger time at 2023-12-16 18:42:04 UT, with upper limit up to 17.6 mag. Observations started at twilight. The observations began at zenith distance = 66 deg. The sun altitude is -11.7 deg.\n\nThe galactic latitude b = -24 deg., longitude l = 148 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#34628\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 413 | MASTER-SAAO | P\\\\ | 60 | 15.6 |\n 473 | MASTER-SAAO | P\\\\ | 180 | 16.2 | Coadd\n 413 | MASTER-SAAO | P/ | 60 | 16.8 |\n 492 | MASTER-SAAO | P\\\\ | 60 | 15.8 |\n 492 | MASTER-SAAO | P/ | 60 | 16.9 |\n 572 | MASTER-SAAO | P\\\\ | 60 | 16.1 |\n 572 | MASTER-SAAO | P/ | 60 | 17.1 |\n 661 | MASTER-SAAO | P\\\\ | 60 | 16.2 |\n 661 | MASTER-SAAO | P/ | 60 | 17.2 |\n 741 | MASTER-SAAO | P\\\\ | 60 | 16.4 |\n 741 | MASTER-SAAO | P/ | 60 | 17.4 |\n 832 | MASTER-SAAO | P\\\\ | 60 | 16.5 |\n 832 | MASTER-SAAO | P/ | 60 | 17.5 |\n 911 | MASTER-SAAO | P\\\\ | 60 | 16.5 |\n 911 | MASTER-SAAO | P/ | 60 | 17.5 |\n 1000 | MASTER-SAAO | P\\\\ | 60 | 16.4 |\n 1000 | MASTER-SAAO | P/ | 60 | 17.6 |\n 1080 | MASTER-SAAO | P\\\\ | 60 | 16.6 |\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35379.",
"published": "2023-12-16T18:57:18.474710Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-16T18:57:18.474726Z",
"modified": "2023-12-16T18:57:18.480074Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5369,
"topic": "gcn.circular",
"uuid": "f5226766-8d94-496a-97cf-76a9158f6f4d",
"title": "GRB 231215A: GRBAlpha detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "23/12/16 19:56:14 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35380"
},
"title": "GCN CIRCULAR",
"number": "35380",
"subject": "GRB 231215A: GRBAlpha detection"
},
"message_text": "M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, M. Kolar, L. Szakszonova, J.-P. Breuer, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration.\n\nThe long-duration GRB 231215A (Swift/BAT detection: GCN 35343; Fermi/GBM detection: GCN 35344; AstroSat detection: GCN 35352; AGILE detection: GCN 35361; CALET/CGBM detection: GCN 35368; Konus/Wind detection: GCN 35377; INTEGRAL/SPI-ACS peak detection at 2023-12-15 ~09:47:26 UT) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023, A&A, 677, 40; arXiv:2302.10048).\n\nThe detection was confirmed at the peak time 2023-12-15 09:47:27 UTC. The T90 duration measured by GRBAlpha is 16 s and the overall significance during T90 reaches 42 sigma.\n\nThe light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB231215A_GCN.pdf\n\nAll GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/hea/GRBAlpha/ \nGRBAlpha, launched on 2021 March 22, is a demonstration mission for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~50 keV to ~1000 keV. To increase the duty cycle and the downlink rate, the upgrade of the on-board data acquisition software stack is in progress. The ground segment is also supported by the radio amateur community and it takes advantage of the SatNOGS network for increased data downlink volume. \n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35380.",
"published": "2023-12-16T19:56:26.519446Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-16T19:56:26.519462Z",
"modified": "2023-12-16T19:56:26.524807Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5370,
"topic": "gcn.circular",
"uuid": "edae3656-f9b7-4e42-aa52-140efc408236",
"title": "GRB 231216A: BOOTES-2/TELMA optical upper limit",
"submitter": "Hop gcn.circular",
"authors": "Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>",
"data": {
"date": "23/12/16 20:47:29 GMT",
"from": "Youdong HU at IAA-CSIC <huyoudong072@hotmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35381"
},
"title": "GCN CIRCULAR",
"number": "35381",
"subject": "GRB 231216A: BOOTES-2/TELMA optical upper limit"
},
"message_text": "Y.-D. Hu, E. Fernandez-Garcia, A. J. Castro-Tirado, M.D. Caballero-Garcia, R. Sanchez-Ramirez, I. Perez-Garcia, S.-Y. Wu, S. Guziy (IAA-CSIC), C. Perez del Pulgar, A. Castellon, I. Carrasco, A. Reina (Univ. de Malaga), R. Fernandez-Munoz (IHSM/UMA-CSIC) and M. Jelinek (ASU-CAS), on behalf of a larger collaboration, report:\n\nFollowing the detection of GRB 231216A by Swift (Sbarrato et al., GCNC 35378), the 0.6m BOOTES-2/TELMA robotic telescope at IHSM La Mayora (UMA-CSIC) in Algarrobo Costa (Malaga, Spain) automatically pointed to the burst position on Dec. 16 at 18:41:57 UT (i.e. ~51 s after notice, 5.3 min after trigger). In the co-added image (28 x 10 s, clear filter), no optical afterglow is detected within the XRT position down to 20.0 mag, which is consistent with both reports from UVOT (Sbarrato et al., GCNC 35378) and MASTER (Lipunov et al. GCNC 35379).\n\nWe thank the staff at IHSM/UMA-CSIC La Mayora for their excellent support.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35381.",
"published": "2023-12-16T20:47:39.684916Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-16T20:47:39.684932Z",
"modified": "2023-12-16T20:47:39.694130Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5373,
"topic": "gcn.circular",
"uuid": "f1a4dd32-82b3-48c8-a80a-60b42318a8bf",
"title": "GRB 231216A: NOT optical upper limits",
"submitter": "Hop gcn.circular",
"authors": "Daniele B. Malesani at IMAPP / Radboud University <d.malesani@astro.ru.nl>",
"data": {
"date": "23/12/16 22:12:21 GMT",
"from": "Daniele B. Malesani at IMAPP / Radboud University <d.malesani@astro.ru.nl>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35382"
},
"title": "GCN CIRCULAR",
"number": "35382",
"subject": "GRB 231216A: NOT optical upper limits"
},
"message_text": "Daniele B. Malesani (DAWN/NBI and Radboud Univ.), Jacco H. Terwel (TCD and NOT), Benjamin N. Hauptmann (DTU Space and NOT) report on behalf of a larger collaboration:\n\nWe observed the position of GRB 231216A (Sbarrato et al., GCN 35378) using the Nordic Optical Telescope equipped with the ALFOSC images. Observations were carried out in the SDSS r and z filters, with an exposure time of 4x200 s in each filter. The delivered seeing in the combined images was around 1.5\", and some calima affected the sky transparency.\n\nWithin (or near) the current XRT error circle, we detect no new objects down to magnitudes r > 23.5 and z > 21.5 (both AB), with mean times 2.25 and 2.44 hr after the trigger, respectively.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35382.",
"published": "2023-12-16T22:12:31.524370Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-16T22:12:31.524386Z",
"modified": "2023-12-16T22:12:31.532819Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5374,
"topic": "gcn.circular",
"uuid": "28fd4dbc-6370-47f3-9ddd-b229c68db758",
"title": "GRB 231216A: GIT optical upper limit",
"submitter": "Hop gcn.circular",
"authors": "Vishwajeet Swain at IIT Bombay <vishwajeet.s@iitb.ac.in>",
"data": {
"date": "23/12/16 22:30:41 GMT",
"from": "Vishwajeet Swain at IIT Bombay <vishwajeet.s@iitb.ac.in>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35383"
},
"title": "GCN CIRCULAR",
"number": "35383",
"subject": "GRB 231216A: GIT optical upper limit"
},
"message_text": "R. Sharma, V. Swain, V. Bhalerao (IIT Bombay), S. Barway, G. C. Anupama (IIA), K. Angail (IAO)\n\nWe observed the field of GRB 231216A detected by Swift (Sbarrato et al., GCN Circ. 35378) with 0.7m GROWTH-India Telescope (GIT). The observations started at 18:59:01.9 UT on 2023-12-16, i.e., 23 minutes after the BAT trigger. We obtained the multiple exposures of 100 and 300 sec in the g' and r' filters. In our stacked images, we did not detect the afterglow within the Swift-XRT position. The obtained upper limits follow as:\n\nJD (mid) | t_mid-t0 (hours)| Filter | Exposure (s) | Limiting Magnitude (5 sigma) |\n\n2460295.3278711 | 1.27 | r' | 5100 (stacked) | 22.0 |\n2460295.3648310 | 2.16 | g' | 1500 (stacked) | 21.0 |\n\nOur results are consistent with the upper limits reported by Global MASTER-Net (Lipunov et al., GCN Circ. 35379), BOOTES-2/TELMA (Hu et al., GCN Circ. 35381) and NOT (Malesani et al., GCN Circ. 35382). The magnitudes are calibrated against PanSTARRS DR1 (Chambers et al., 2016) and not corrected for Galactic extinction.\n\nThe GROWTH India Telescope (GIT; Kumar et al. 2022) is a 70-cm telescope with a 0.7-degree field of view, set up by the Indian Institute of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB) with funding from DST-SERB and IUSSTF. It is located at the Indian Astronomical Observatory (Hanle), operated by IIA. We acknowledge funding by the IITB alumni batch of 1994, which partially supports the operations of the telescope. Telescope technical details are available at https://sites.google.com/view/growthindia/.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35383.",
"published": "2023-12-16T22:30:52.461330Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-16T22:30:52.461345Z",
"modified": "2023-12-16T22:30:52.466373Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5375,
"topic": "gcn.circular",
"uuid": "aba9d412-6244-466f-9c66-52c2f0f95cec",
"title": "GRB 231216A: R-band observations from T120 at Observatoire de Haute-Provence",
"submitter": "Hop gcn.circular",
"authors": "Christophe Adami at LAM <christophe.adami@lam.fr>",
"data": {
"date": "23/12/16 23:40:34 GMT",
"from": "Christophe Adami at LAM <christophe.adami@lam.fr>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35384"
},
"title": "GCN CIRCULAR",
"number": "35384",
"subject": "GRB 231216A: R-band observations from T120 at Observatoire de Haute-Provence"
},
"message_text": "S. Basa (OHP/Pythéas/LAM), C. Adami (Pythéas/LAM), Y. Degot-Longhi (OHP/Pythéas), A. Saccardi (GEPI, Obs. de Paris), D. Adrien, E. Le Floc'h, F. Schüssler,\nD. Turpin (CEA Paris-Saclay), report on behalf of a larger collaboration:\n\nWe observed the field of GRB231216A (GCN 35378; Sbarrato et al.) using the T120cm camera at Observatoire de Haute-Provence (France).\nWe began our observations on 2023 16 December 21:37:24 UT (~3h after the trigger time) with a series of R-band (10x300s) images. \nLast image was taken at 22:37:51 UT. \n\nConsistently with Lipunov et al. (GCN 35379), Hu et al. (GCN 35381), Malesani et al. (GCN 35382), and Sharma et al. (GCN 35383), we did not \ndetect any credible optical counterpart to GRB231216A within the GCN 35378 Swift XRT error box.\n\nUsing the r-band PanStarr public image, the faintest detected object in our R-band image with a measured PanStarr magnitude is at rMeanPSFMag=22.2.\n\n\nWe acknowledge the excellent support from Observatoire de Haute-Provence, in particular Jean Balcaen.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35384.",
"published": "2023-12-16T23:40:47.812171Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-16T23:40:47.812185Z",
"modified": "2023-12-16T23:40:47.819534Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5380,
"topic": "gcn.circular",
"uuid": "5e725797-17ff-4a35-873e-1b75bb79dce8",
"title": "GRB 231214A: Swift-BAT refined analysis",
"submitter": "Hop gcn.circular",
"authors": "Takanori Sakamoto at AGU <tsakamoto@phys.aoyama.ac.jp>",
"data": {
"date": "23/12/17 04:55:15 GMT",
"from": "Takanori Sakamoto at AGU <tsakamoto@phys.aoyama.ac.jp>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35385"
},
"title": "GCN CIRCULAR",
"number": "35385",
"subject": "GRB 231214A: Swift-BAT refined analysis"
},
"message_text": "M. Stamatikos (OSU), S. D. Barthelmy (GSFC), R. Brivio (INAF-OAB),\nH. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa),\nC. B. Markwardt (GSFC), M. Moss (GSFC), D. M. Palmer (LANL),\nT. Parsotan (GSFC/UMBC), T. Sakamoto (AGU)\n(i.e. the Swift-BAT team):\n Using the data set from T-35 to T+962 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 231214A (trigger #1202386)\n(Brivio, et al., GCN Circ. 35335). The BAT ground-calculated position is\nRA, Dec = 305.666, -72.432 deg which is\n RA(J2000) = 20h 22m 39.7s\n Dec(J2000) = -72d 25' 54.3\"\nwith an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 39%.\n The mask-weighted light curve shows two bright overlapping peaks. The first\npeak starts from T-5 s, peaks at T+1 s and ends at T+10 s. The second peak\nstarts from T+10 s, peaks at T+12 s and ends at T+25 s.\nT90 (15-350 keV) is 27.8 +- 7.3 sec (estimated error including systematics).\n The time-averaged spectrum from T-5.37 to T+49.42 sec is best fit by a power law\nwith an exponential cutoff. This fit gives a photon index 0.87 +- 0.23,\nand Epeak of 167 +- 94 keV (chi squared 60.53 for 56 d.o.f.). For this\nmodel the total fluence in the 15-150 keV band is 9.6 +- 0.3 x 10^-6 erg/cm2\nand the 1-sec peak flux measured from T+12.57 sec in the 15-150 keV band is\n11.3 +- 0.6 ph/cm2/sec. A fit to a simple power law gives a photon index\nof 1.25 +- 0.05 (chi squared 69.34 for 57 d.o.f.). All the quoted errors\nare at the 90% confidence level.\n The results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/1202386/BA/\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35385.",
"published": "2023-12-17T04:55:28.375761Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-17T04:55:28.375783Z",
"modified": "2023-12-17T04:55:28.383072Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5381,
"topic": "gcn.circular",
"uuid": "c5634c16-e363-49c7-a0fe-23c335f1c726",
"title": "GRB 231215A: Swift-BAT refined analysis",
"submitter": "Hop gcn.circular",
"authors": "Takanori Sakamoto at AGU <tsakamoto@phys.aoyama.ac.jp>",
"data": {
"date": "23/12/17 04:59:08 GMT",
"from": "Takanori Sakamoto at AGU <tsakamoto@phys.aoyama.ac.jp>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35386"
},
"title": "GCN CIRCULAR",
"number": "35386",
"subject": "GRB 231215A: Swift-BAT refined analysis"
},
"message_text": "S. D. Barthelmy (GSFC), P. D'Avanzo (INAF-OAB), H. A. Krimm (NSF),\nS. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC),\nM. Moss (GSFC), D. M. Palmer (LANL), T. Parsotan (GSFC/UMBC),\nT. Sakamoto (AGU), M. Stamatikos (OSU)\n(i.e. the Swift-BAT team):\n\nUsing the data set from T-240 to T+962 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 231215A (trigger #1202522)\n(D'Avanzo, et al., GCN Circ. 35343). The BAT ground-calculated position is\nRA, Dec = 9.730, 57.634 deg which is\n RA(J2000) = 00h 38m 55.1s\n Dec(J2000) = +57d 38' 00.8\"\nwith an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 6%.\n The mask-weighted light curve shows a structure of several overlapping pulses.\nThe emission starts from T-10 s, peaks at T0 and ends at T+20 s.\nT90 (15-350 keV) is 20.75 +- 3.69 sec (estimated error including systematics).\n The time-averaged spectrum from T-7.04 to T+19.79 sec is best fit by a simple\npower-law model. The power law index of the time-averaged spectrum is\n1.01 +- 0.09. The fluence in the 15-150 keV band is 1.0 +- 0.1 x 10^-5 erg/cm2.\nThe 1-sec peak photon flux measured from T+0.18 sec in the 15-150 keV band\nis 9.6 +- 1.4 ph/cm2/sec. All the quoted errors are at the 90% confidence\nlevel.\n The results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/1202522/BA/\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35386.",
"published": "2023-12-17T04:59:15.776082Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-17T04:59:15.776097Z",
"modified": "2023-12-17T04:59:15.781091Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5382,
"topic": "gcn.circular",
"uuid": "80916ad9-6d2f-40d9-8a5c-62168c9ee715",
"title": "GRB 231216A: Swift-BAT refined analysis",
"submitter": "Hop gcn.circular",
"authors": "Takanori Sakamoto at AGU <tsakamoto@phys.aoyama.ac.jp>",
"data": {
"date": "23/12/17 05:01:41 GMT",
"from": "Takanori Sakamoto at AGU <tsakamoto@phys.aoyama.ac.jp>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35387"
},
"title": "GCN CIRCULAR",
"number": "35387",
"subject": "GRB 231216A: Swift-BAT refined analysis"
},
"message_text": "H. A. Krimm (NSF), S. D. Barthelmy (GSFC), S. Laha (GSFC/UMBC),\nA. Y. Lien (U Tampa), C. B. Markwardt (GSFC), M. Moss (GSFC),\nD. M. Palmer (LANL), T. Parsotan (GSFC/UMBC), T. Sakamoto (AGU),\nT. Sbarrato (INAF-OAB), M. Stamatikos (OSU)\n(i.e. the Swift-BAT team):\n\nUsing the data set from T-240 to T+963 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 231216A (trigger #1202749)\n(Sbarrato, et al., GCN Circ. 35378). The BAT ground-calculated position is\nRA, Dec = 39.778, 33.614 deg which is\n RA(J2000) = 02h 39m 06.6s\n Dec(J2000) = +33d 36' 48.9\"\nwith an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 59%.\n\nThe mask-weighted light curve shows a structure of multiple pulses.\nThe emission starts from T-5 s, peaks at T0 and ends at T+60 s.\nT90 (15-350 keV) is 51.2 +- 3.1 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-1.12 to T+51.39 sec is best fit by a simple\npower-law model. The power law index of the time-averaged spectrum is\n1.63 +- 0.20. The fluence in the 15-150 keV band is 1.0 +- 0.1 x 10^-6 erg/cm2.\nThe 1-sec peak photon flux measured from T-0.51 sec in the 15-150 keV band\nis 1.8 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence\nlevel.\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/1202749/BA/\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35387.",
"published": "2023-12-17T05:01:48.979517Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-17T05:01:48.979541Z",
"modified": "2023-12-17T05:01:48.988515Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5385,
"topic": "gcn.circular",
"uuid": "f8a55952-1190-4d79-ae24-07d421be50df",
"title": "GRB 231216A: Swift/UVOT Upper Limits",
"submitter": "Hop gcn.circular",
"authors": "Paul Kuin at MSSL <npkuin@gmail.com>",
"data": {
"date": "23/12/17 10:03:34 GMT",
"from": "Paul Kuin at MSSL <npkuin@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35388"
},
"title": "GCN CIRCULAR",
"number": "35388",
"subject": "GRB 231216A: Swift/UVOT Upper Limits"
},
"message_text": "N. P. M. Kuin (UCL-MSSL) and Sbarrato (INAF-OAB)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 231216A\n191 s after the BAT trigger (Sbarrato et al., GCN Circ. 35378).\nNo optical afterglow consistent with the XRT position was detected\nin the initial UVOT exposures.\n\nPreliminary 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first\nfinding chart (FC) exposure and subsequent exposures are:\n\nFilter T_start(s) T_stop(s) Exp(s) Mag\n\nu_FC 191 441 246 >20.2\nv 497 814 58 >18.5\nb 447 1028 63 >20.0\nu 191 1018 432 >20.8\nw1 546 864 58 >19.5\nm2 819 839 19 >18.3\nw2 473 790 58 >19.6\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.082 in the direction of the burst\n(Schlegel et al. 1998).\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35388.",
"published": "2023-12-17T10:03:45.289131Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-17T10:03:45.289158Z",
"modified": "2023-12-17T10:03:45.298473Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5386,
"topic": "gcn.circular",
"uuid": "afe34f57-8fbc-4c8f-a02d-d58c5c403bbc",
"title": "GRB 231216A: REM NIR upper limits",
"submitter": "Hop gcn.circular",
"authors": "Matteo Ferro <matteo.ferro@inaf.it>",
"data": {
"date": "23/12/17 13:53:14 GMT",
"from": "Matteo Ferro <matteo.ferro@inaf.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35389"
},
"title": "GCN CIRCULAR",
"number": "35389",
"subject": "GRB 231216A: REM NIR upper limits"
},
"message_text": "M. Ferro, R. Brivio, P. D'Avanzo, S. Covino, D. Fugazza (INAF-OAB) on behalf of the REM team, report:\n\nWe observed the field of GRB 231216A (Sbarrato et al., GCN 35378) with the REM 60cm robotic telescope located at the ESO Observatory of La Silla (Chile). The observations were carried out in the g,r,i,z, J,H,K bands, starting on 2023 Dec 17 at 00:40:48 UT (i.e. about 6.09 hours after the Swift trigger) and lasted for about 1 hour.\nFrom preliminary analysis, we do not find any source at the XRT position (Sbarrato et al., GCN 35378), down the the following 3 sigma upper limits:\n\nH > 16.7 (Vega; calibrated against the 2MASS catalogue)\nat a mid time of t-t0 ~ 6.52 h after the GRB trigger;\n\nK > 16.3 (Vega; calibrated against the 2MASS catalogue)\nat a mid time of t-t0 ~ 6.61 h after the GRB trigger.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35389.",
"published": "2023-12-17T13:53:24.897717Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-17T13:53:24.897739Z",
"modified": "2023-12-17T13:53:24.905770Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5387,
"topic": "gcn.circular",
"uuid": "ce85f9f4-ea36-481c-a5bd-dfec6d607e55",
"title": "GRB 231216A: AST3-3 YaoAn Optical Upper Limit",
"submitter": "Hop gcn.circular",
"authors": "Tianrui Sun at Purple Mountain Obs,CAS <trsun@pmo.ac.cn>",
"data": {
"date": "23/12/17 15:05:33 GMT",
"from": "Tianrui Sun at Purple Mountain Obs,CAS <trsun@pmo.ac.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35390"
},
"title": "GCN CIRCULAR",
"number": "35390",
"subject": "GRB 231216A: AST3-3 YaoAn Optical Upper Limit"
},
"message_text": "Tian-Rui Sun (Purple Mountain Observatory), Yan-Long Hua, Mao-Kai Hu, Xue-Feng Wu, Lei Liu, Ke-Lai Meng, Xiao-Yan Li (Nanjing Institute of Astronomical Observation Technology),\nXiang-Yan Yuan, Lifan Wang (TAMU), Xiao-Feng Wang (Tsinghua University), Lei Hu (CMU) report on behalf the AST3 Team:\n\nFollowing the detection of GRB 231216A by Swift (Sbarrato et al., GCNC 35378),\nwe use Antarctic Survey Telescope 3-3 at YaoAn Astronomy Observation Station (China, Yunnan) for follow-up.\nOur observation started on 2023-12-16T18:44:08 (about 506 seconds after the trigger of BAT (Sbarrato et al., GCNC 35378)).\nNo optical source was detected within the XRT error box down to 20.7 mag in the coadded image (total 600s, g-band).\n\n\nOur non-detection is consistent with the results from the UVOT (Sbarrato et al., GCN 35378), MASTER (Lipunov et al. GCN 35379),\nthe BOOTES-2/TELMA (Hu et al. GCN 35381), NOT (Daniele B. Malesani et al., GCN 35382) and the T120 at Observatoire de Haute-Provence (Basa et al., GCN 35384)limits.\n\nWe thank the staff at YaoAn Astronomy Observation Station for their excellent support.\n\n\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35390.",
"published": "2023-12-17T15:05:48.359092Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-17T15:05:48.359108Z",
"modified": "2023-12-17T15:05:48.366790Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5392,
"topic": "gcn.circular",
"uuid": "450435c4-24f5-4269-b177-ea4a5b6c101a",
"title": "GRB 231216A: Swift-XRT refined analysis correction",
"submitter": "Hop gcn.circular",
"authors": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"data": {
"date": "23/12/17 19:53:03 GMT",
"from": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35393"
},
"title": "GCN CIRCULAR",
"number": "35393",
"subject": "GRB 231216A: Swift-XRT refined analysis correction"
},
"message_text": "K.L. Page (U. Leicester) reports on behalf of the Swift-XRT team:\n\nGCN Circular 35391 omitted the uncertainties on the light curve power-law\ndecay for the Swift-XRT data. The correct value is a decay index of\nalpha=0.72 (+0.11, -0.09).\n\nIf the light curve continues to decay with a power-law decay index of\n0.72, the count rate at T+24 hours will be 4.8 x 10^-3 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.8 x 10^-13\n(2.8 x 10^-13) erg cm^-2 s^-1.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35393.",
"published": "2023-12-17T19:53:10.794142Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-17T19:53:10.794158Z",
"modified": "2023-12-17T19:53:10.799450Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5388,
"topic": "gcn.circular",
"uuid": "e85a8832-c7a9-491f-8fbe-019b861dfee3",
"title": "GRB 231216A: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "23/12/17 19:18:04 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35391"
},
"title": "GCN CIRCULAR",
"number": "35391",
"subject": "GRB 231216A: Swift-XRT refined Analysis"
},
"message_text": "B. Sbarufatti (INAF-OAB), C. Salvaggio (INAF-OAB), M. Ferro (INAF-OAB),\nJ. D. Gropp (PSU), S. Dichiara (PSU), J.A. Kennea (PSU), A.P. Beardmore\n(U. Leicester), J.P. Osborne (U. Leicester) and P.A. Evans report on\nbehalf of the Swift-XRT team:\n\nWe have analysed 6.1 ks of XRT data for GRB 231216A, from 115 s to 68.0\nks after the BAT trigger. The data comprise 8 s in Windowed Timing\n(WT) mode (taken while Swift was slewing), with the remainder in Photon\nCounting (PC) mode. The refined XRT position is RA, Dec = 39.7727,\n+33.5764 which is equivalent to:\n\nRA (J2000): 02 39 05.45\nDec(J2000): +33 34 35.0\n\nwith an uncertainty of 3.9 arcsec (radius, 90% confidence).\n\nThe light curve can be modelled with a power-law decay with a decay\nindex of alpha=0.7 (+nan, -nan).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 2.1 (+0.4, -0.3). The\nbest-fitting absorption column is 3.2 (+1.7, -1.4) x 10^21 cm^-2, in\nexcess of the Galactic value of 8.4 x 10^20 cm^-2 (Willingale et al.\n2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion\nfactor deduced from this spectrum is 3.7 x 10^-11 (5.7 x 10^-11) erg\ncm^-2 count^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 3.2 (+1.7, -1.4) x 10^21 cm^-2\nGalactic foreground: 8.4 x 10^20 cm^-2\nExcess significance: 2.8 sigma\nPhoton index:\t 2.1 (+0.4, -0.3)\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/01202749.\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35391.",
"published": "2023-12-17T19:18:15.925174Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-17T19:18:15.925189Z",
"modified": "2023-12-17T19:18:15.934248Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5391,
"topic": "gcn.circular",
"uuid": "be214d05-b850-4d9c-a69e-63498c506fb4",
"title": "GRB 231215A: Osservatorio Astronomico Nastro Verde upper limit",
"submitter": "Hop gcn.circular",
"authors": "Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy - MPC Code C82 <osservatorionastroverde@gmail.com>",
"data": {
"date": "23/12/17 19:52:34 GMT",
"from": "Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy - MPC Code C82 <osservatorionastroverde@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35392"
},
"title": "GCN CIRCULAR",
"number": "35392",
"subject": "GRB 231215A: Osservatorio Astronomico Nastro Verde upper limit"
},
"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 image the field of GRB 231215A detected by Swift Burst Alert Telescope (BAT)(trigger 1202522)\nwith telescope of Nastro Verde Observatory - Sorrento (Naples), Italy. Member of:\nAAVSO - American Association of Variable Star Observers.\nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili.\nAstroCampania Associazione\n\nThe observations started at 16:28 UT of 2023/12/15, after 6,40 hours after the GRB trigger, at the end of twilight\nwith principal telescope SC 0.35 f/10 with focal reduced + CCD Sbig ST10 XME\nI took 20 image of 60 sec each. All images are unfiltered, calibrated with masterdark and masterflat,stacked with Tycho Tracker software\nWe have not detected any clearly visible sources, up to 20th magnitude with clear skies.\nStart T0+ End T0+ Rlim\n16:28:50 UT 17:08:29 UT 20\n\nWe did not found any optical counterpart in the error box of the XRTcandidate.\nP. D'Avanzo et al. GCN 35343\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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35392.",
"published": "2023-12-17T19:52:44.753097Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-17T19:52:44.753111Z",
"modified": "2023-12-17T19:52:44.758187Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5393,
"topic": "gcn.circular",
"uuid": "3e3dc733-3e03-408b-b1fd-a2075ebc1c1e",
"title": "GRB 231216A: Osservatorio Astronomico Nastro Verde upper limit",
"submitter": "Hop gcn.circular",
"authors": "Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy - MPC Code C82 <osservatorionastroverde@gmail.com>",
"data": {
"date": "23/12/17 20:06:20 GMT",
"from": "Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy - MPC Code C82 <osservatorionastroverde@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35394"
},
"title": "GCN CIRCULAR",
"number": "35394",
"subject": "GRB 231216A: Osservatorio Astronomico Nastro Verde upper limit"
},
"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 image the field of GRB 231216A detected by Swift Burst Alert Telescope (BAT)(trigger 1202749)\nwith telescope of Nastro Verde Observatory - Sorrento (Naples), Italy. Member of:\nAAVSO - American Association of Variable Star Observers.\nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili.\nAstroCampania Associazione\n\nThe observations started at 20:15 UT of 2023/12/16, after 1,40 hours after the GRB trigger, with principal telescope SC 0.35 f/10 with focal reduced + CCD Sbig ST10 XME\nI took 20 image of 60 sec each. All images are unfiltered, calibrated with masterdark and masterflat,stacked with Tycho Tracker software\nWe have not detected any clearly visible sources, up to 19.5th magnitude in a sky with light clouds and gusts of wind.\nStart T0+ End T0+ Rlim\n20:15:25 UT 20:36:38 UT 19.5\n\nWe did not found any optical counterpart in the error box of the XRTcandidate.\nT. Sbarrato et al. GCN 35378\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\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35394.",
"published": "2023-12-17T20:06:30.431111Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-17T20:06:30.431126Z",
"modified": "2023-12-17T20:06:30.437286Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5394,
"topic": "gcn.circular",
"uuid": "58df01a3-6fda-4a7d-afd3-74ba80da7748",
"title": "GRB 231216A: LCOGT Optical Upper Limits",
"submitter": "Hop gcn.circular",
"authors": "Robert Strausbaugh at Eastern Illinois University <rstrausbaugh@eiu.edu>",
"data": {
"date": "23/12/18 14:33:54 GMT",
"from": "Robert Strausbaugh at Eastern Illinois University <rstrausbaugh@eiu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35395"
},
"title": "GCN CIRCULAR",
"number": "35395",
"subject": "GRB 231216A: LCOGT Optical Upper Limits"
},
"message_text": "R. Strausbaugh (Eastern Illinois University), A. Cucchiara (NASA) report on behalf of a larger collaboration:\n\nWe observed the Swift GRB 231216A (Sbarrato et al., GCN 35378) field with the LCOGT 1-meter Sinistro instrument at the Teide Observatory, Tenerife site, on December 16, from 19:08 to 19:41 UT (corresponding to 0.55 to 1.10 hours after the GRB trigger time) with the sdss r and i filters.\n\nWe performed a series of 3x300s exposures in each band. We do not detect an uncataloged source within the XRT error region in either band. This result is consistent with other optcal upper limits (Hu et al., GCN 35381; Malesani et al., GCN 35382; Sharma et al., GCN 35383; Basa et al., GCN 35384; Kuin et al., GCN 35388; Sun et al., GCN 35390; Ruocco et al., 35394).\n\nThe following 5-sigma upper limits are calculated using the PanSTARRS catalog as reference:\n\nr > 22.7\ni > 22.1\n\nThese magnitudes are not corrected for galactic extinction.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35395.",
"published": "2023-12-18T14:34:11.465538Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-18T14:34:11.465567Z",
"modified": "2023-12-18T14:34:11.475549Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 5395,
"topic": "gcn.circular",
"uuid": "f56ac04a-a9ef-48cc-8bb3-0d2744e5b5f8",
"title": "GRB 231216A: Nanshan/HMT optical upper limit",
"submitter": "Hop gcn.circular",
"authors": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
"data": {
"date": "23/12/18 14:59:03 GMT",
"from": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35396"
},
"title": "GCN CIRCULAR",
"number": "35396",
"subject": "GRB 231216A: Nanshan/HMT optical upper limit"
},
"message_text": "J. An, S.Y. Fu, S.Q. Jiang, X. Liu, Z.P. Zhu, T.H. Lu, D. Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:\n\nWe observed the field of GRB 231216A detected by Swift (Sbarrato et al., GCN 35378) using the HMT-0.5m telescope located at Nanshan, Xinjiang, China. Observations started at 18:42:32 UT on 2023-12-16, i.e., 6.83 mins after the Swift/BAT trigger, and a series of 20, 40, 60, 90, 120, 200 s frames were obtained without any filter.\n\nNo optical source is detected in our stacked image at the XRT position (Sbarrato et al., GCN 35378), down to the 3-sigma limiting magnitude of m(r) > 20.2 mag (AB) @ 26.03 mins post-burst, calibrated with the nearby PanSTAR field in the Sloan r-filter. The magnitude is not corrected for Galactic extinction.\n\n\n\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35396.",
"published": "2023-12-18T14:59:18.034262Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2023-12-18T14:59:18.034278Z",
"modified": "2023-12-18T14:59:18.042670Z",
"nonlocalizedevents": [],
"targets": []
}
]
}
