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"count": 257701,
"next": "https://hermes.lco.global/api/v0/messages/?format=api&limit=100&offset=2200&ordering=topic",
"previous": "https://hermes.lco.global/api/v0/messages/?format=api&limit=100&offset=2000&ordering=topic",
"results": [
{
"id": 6026,
"topic": "gcn.circular",
"uuid": "e91c8d4b-2539-451c-84c6-bd37d1f3a1f9",
"title": "GRB 240215A: Swift/BAT-GUANO localization of a burst",
"submitter": "Hop gcn.circular",
"authors": "Jimmy DeLaunay at Penn State <delauj2@gmail.com>",
"data": {
"date": "24/02/15 21:38:30 GMT",
"from": "Jimmy DeLaunay at Penn State <delauj2@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35733"
},
"title": "GCN CIRCULAR",
"number": "35733",
"subject": "GRB 240215A: Swift/BAT-GUANO localization of a burst"
},
"message_text": "James DeLaunay (PSU), Aaron Tohuvavohu (U Toronto), Samuele Ronchini (PSU), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:\n\nSwift/BAT did not localize GRB 240215A onboard (T0: 2024-02-15T15:33:00.41 UTC, Fermi/GBM trigger 729703985).\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\nIn ground analysis of the available TTE data, we find the position of\nthe burst with SNR 13.9 in the image domain.\n\nAt the time of the trigger, Swift did not have a lock on its star tracker so positions may be inaccurate by up to a few tenths of a degree.\n\nThe BAT position is\nRA, Dec = 132.237, -6.4058, which is:\n RA (J2000) 08h 48m 56.88s\n Dec (J2000) -06d 24' 20.88\"\nwith an estimated statistical uncertainty of 3 arcminutes plus ~15 arcminutes due to loss of star tracker loss\n\nXRT and UVOT follow-up has been requested.\nResults of follow-up observations will be reported in future circulars.\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/35733.",
"published": "2024-02-15T21:38:49.089817Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-15T21:38:49.089845Z",
"modified": "2024-02-15T21:38:49.099076Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6027,
"topic": "gcn.circular",
"uuid": "080751c8-185a-41dc-b936-6a0a7c8c8ddb",
"title": "GRB 240215A: Tiled Swift observations",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/02/16 03:52:48 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35734"
},
"title": "GCN CIRCULAR",
"number": "35734",
"subject": "GRB 240215A: Tiled Swift observations"
},
"message_text": "\nP. A. Evans (U. Leicester) reports on behalf of the Swift team:\n\nSwift has initiated a series of observations, tiled on the sky, of the\nSwift/BAT GRB 240215A. Automated analysis of the XRT data will\nbe presented online at http://www.swift.ac.uk/xrt_products/TILED_GRB00123\n\nAny uncatalogued X-ray sources detected in this analysis will be\nreported on this website and via GCN COUNTERPART notices. The probability of finding\nserendipitous sources, unrelated to the Swift/BAT event is high: any X-ray source\nconsidered to be a probable afterglow candidate will be reported via a GCN Circular\nafter manual consideration.\n\nDetails of the XRT automated analysis methods are detailed in Evans et\nal. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35734.",
"published": "2024-02-16T03:53:08.965589Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-16T03:53:08.965611Z",
"modified": "2024-02-16T03:53:08.975012Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6028,
"topic": "gcn.circular",
"uuid": "20d0c216-d278-47c4-b441-b87dd7dcefbd",
"title": "Fermi trigger No 729719508: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "24/02/16 10:00:52 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35735"
},
"title": "GCN CIRCULAR",
"number": "35735",
"subject": "Fermi trigger No 729719508: 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 GRB240215.83 (trigger No 729719508,19h 32m 16.08s , -19d 58m 58.8s, R\u0015.48) errorbox 18211 sec after notice time and 18776 sec after trigger time at 2024-02-16 01:04:40 UT, with upper limit up to 17.1 mag. The observations began at zenith distance = 79 deg. The sun altitude is -35.3 deg.\n\nThe galactic latitude b = -18 deg., longitude l = 19 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#79323\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 18806 | 2024-02-16 01:04:40 | MASTER-SAAO | (18h 29m 54.08s , -29d 10m 00.4s) | C | 60 | 17.1 |\n 18806 | 2024-02-16 01:04:40 | MASTER-SAAO | (18h 35m 54.74s , -29d 22m 02.4s) | C | 60 | 16.3 |\n 18886 | 2024-02-16 01:05:59 | MASTER-SAAO | (18h 33m 53.01s , -31d 04m 57.6s) | C | 60 | 17.0 |\n 18886 | 2024-02-16 01:05:59 | MASTER-SAAO | (18h 40m 00.68s , -31d 16m 59.2s) | C | 60 | 16.6 |\n 18966 | 2024-02-16 01:07:19 | MASTER-SAAO | (18h 45m 19.22s , -33d 11m 57.5s) | C | 60 | 17.1 |\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/35735.",
"published": "2024-02-16T10:01:12.192421Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-16T10:01:12.192464Z",
"modified": "2024-02-16T10:01:12.212163Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6029,
"topic": "gcn.circular",
"uuid": "23e0d433-aa96-4c34-bd40-be79117afc44",
"title": "GRB 240216A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "24/02/16 15:50:09 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35736"
},
"title": "GCN CIRCULAR",
"number": "35736",
"subject": "GRB 240216A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 10:57:02 UT on 16 Feb 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240216A (trigger 729773827.851682 / 240216456).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 34.1, Dec = -75.9 (J2000 degrees, equivalent to J2000 02h 16m, -75d 54'), with a statistical uncertainty of 5.1 degrees.\n\nThe angle from the Fermi LAT boresight is 43.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240216456/quicklook/glg_skymap_all_bn240216456.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240216456/quicklook/glg_healpix_all_bn240216456.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240216456/quicklook/glg_lc_medres34_bn240216456.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35736.",
"published": "2024-02-16T15:50:26.355491Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-16T15:50:26.355529Z",
"modified": "2024-02-16T15:50:26.373425Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6030,
"topic": "gcn.circular",
"uuid": "85abb704-5447-442e-a683-0c1ff0e035a1",
"title": "Swift Triggers 12156887-1215690 are not astrophysical events.",
"submitter": "Hop gcn.circular",
"authors": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"data": {
"date": "24/02/16 18:04:30 GMT",
"from": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35737"
},
"title": "GCN CIRCULAR",
"number": "35737",
"subject": "Swift Triggers 12156887-1215690 are not astrophysical events."
},
"message_text": "\nN. J. Klingler (GSFC/UMBC/CRESSTII) and K. L. Page (U Leicester)\nreport on behalf of the Neil Gehrels Swift Observatory Team:\n\nSwift BAT triggers 12156887, 1215688, 1215689 and 1215690 were caused\nby a star tracker loss-of-lock, and are not interesting events.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35737.",
"published": "2024-02-16T18:04:42.720954Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-16T18:04:42.720995Z",
"modified": "2024-02-16T18:04:42.728503Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6031,
"topic": "gcn.circular",
"uuid": "9e7eb312-b735-4307-9d71-20c58cbaad33",
"title": "Fermi GRB 240216A: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "24/02/16 18:31:24 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35738"
},
"title": "GCN CIRCULAR",
"number": "35738",
"subject": "Fermi GRB 240216A: 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 GRB 240216A ( Fermi GBM team, GCN 35736) errorbox 26194 sec after notice time and 26232 sec after trigger time at 2024-02-16 18:14:15 UT, with upper limit up to 17.9 mag. Observations started at twilight. The observations began at zenith distance = 50 deg. The sun altitude is -10.0 deg.\n\nThe galactic latitude b = -39 deg., longitude l = 293 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#79851\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 26262 | 2024-02-16 18:14:15 | MASTER-SAAO | (01h 54m 51.71s , -76d 40m 43.0s) | C | 60 | 17.9 |\n 26262 | 2024-02-16 18:14:15 | MASTER-SAAO | (02h 32m 14.86s , -76d 51m 24.5s) | C | 60 | 17.1 |\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/35738.",
"published": "2024-02-16T18:31:37.256250Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-16T18:31:37.256271Z",
"modified": "2024-02-16T18:31:37.263096Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6032,
"topic": "gcn.circular",
"uuid": "d7061640-b36b-46d5-95a1-6fe89f83ac13",
"title": "GRB 240215B: Swift/BAT-GUANO detection of a burst outside the coded FOV",
"submitter": "Hop gcn.circular",
"authors": "Jimmy DeLaunay at Penn State <delauj2@gmail.com>",
"data": {
"date": "24/02/16 18:36:56 GMT",
"from": "Jimmy DeLaunay at Penn State <delauj2@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35739"
},
"title": "GCN CIRCULAR",
"number": "35739",
"subject": "GRB 240215B: Swift/BAT-GUANO detection of a burst outside the coded FOV"
},
"message_text": "James DeLaunay (PSU), Samuele Ronchini (PSU), Gayathri Raman (PSU), Aaron Tohuvavohu (U Toronto), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:\n\nSwift/BAT did not localize GRB 240215B onboard (T0: 2024-02-15T19:51:43.85 UTC, Fermi trig 729719508)\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 28.8 in a 8.192 s analysis time bin, starting at T0.\n\nNITRATES results are consistent with a burst coming from outside the FOV, with DeltaLLHOut of -28.4.\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 commanding pipeline designed for targeted recovery of BAT event mode data around the times of compelling astrophysical events to enable more sensitive GRB searches.\n\nA live reporting of Swift/BAT event data recovered by GUANO can be found at: https://www.swift.psu.edu/guano/\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35739.",
"published": "2024-02-16T18:37:03.622844Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-16T18:37:03.622886Z",
"modified": "2024-02-16T18:37:03.630471Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6033,
"topic": "gcn.circular",
"uuid": "7d8e84a2-ab42-405a-a3cf-0cacef5899ca",
"title": "GRB 240215C: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "24/02/17 18:46:21 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35740"
},
"title": "GCN CIRCULAR",
"number": "35740",
"subject": "GRB 240215C: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 19:51:43 UT on 15 Feb 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240215C (trigger 729719508.8464 / 240215828).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 279.1, Dec = -44.5 (J2000 degrees, equivalent to J2000 18h 36m, -44d 30'), with a statistical uncertainty of 1.0 degrees.\n\nThe angle from the Fermi LAT boresight is 91.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240215828/quicklook/glg_skymap_all_bn240215828.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240215828/quicklook/glg_healpix_all_bn240215828.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240215828/quicklook/glg_lc_medres34_bn240215828.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35740.",
"published": "2024-02-17T18:46:39.286488Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-17T18:46:39.286509Z",
"modified": "2024-02-17T18:46:39.295168Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6034,
"topic": "gcn.circular",
"uuid": "b3d4fc5a-8f79-4972-a174-961845321455",
"title": "Swift GRB240218.08: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "24/02/18 02:09:20 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35741"
},
"title": "GCN CIRCULAR",
"number": "35741",
"subject": "Swift GRB240218.08: 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 GRB240218.08 (trigger No 1215912,10h 47m 07.44s , +01d 18m 14.4s, R=0.05) errorbox 31 sec after notice time and 55 sec after trigger time at 2024-02-18 02:00:55 UT, with upper limit up to 17.5 mag. The observations began at zenith distance = 47 deg. The sun altitude is -27.1 deg.\n\nThe galactic latitude b = 51 deg., longitude l = 250 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#80863\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 60 | MASTER-SAAO | P/ | 10 | 17.5 |\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/35741.",
"published": "2024-02-18T02:09:42.123561Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-18T02:09:42.123583Z",
"modified": "2024-02-18T02:09:42.134432Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6035,
"topic": "gcn.circular",
"uuid": "fa45cd4f-2245-414e-bf26-63679b74648a",
"title": "GRB 240218A: Swift detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"data": {
"date": "24/02/18 02:17:56 GMT",
"from": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35742"
},
"title": "GCN CIRCULAR",
"number": "35742",
"subject": "GRB 240218A: Swift detection of a burst"
},
"message_text": "\nK. L. Page (U Leicester), T. M. Parsotan (GSFC) and M. H. Siegel (PSU)\nreport on behalf of the Neil Gehrels Swift Observatory Team:\n\nAt 02:00:00 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 240218A (trigger\u001215912). Swift slewed immediately to the burst.\nThe BAT on-board calculated location is\nRA, Dec 161.781, +1.304 which is\n RA(J2000) = 10h 47m 07s\n Dec(J2000) = +01d 18' 14\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including\nsystematic uncertainty). The BAT light curve showed a broad single peak\nstructure after a period of noise with a duration of about 15 sec.\nThe peak count rate was ~1400 counts/sec (15-350 keV), at ~22 sec after the trigger.\n\nThe XRT began observing the field at 02:02:30.1 UT, 149.4 seconds after\nthe BAT trigger. XRT found a bright, uncatalogued X-ray source located\nat RA, Dec 161.7953, 1.2782 which is equivalent to:\n RA(J2000) = 10h 47m 10.87s\n Dec(J2000) = +01d 16' 41.5\"\nwith an uncertainty of 4.9 arcseconds (radius, 90% containment). This\nlocation is 106 arcseconds from the BAT onboard position, within the\nBAT error circle. No event data are yet available to determine the\ncolumn density using X-ray spectroscopy.\n\nUVOT took a finding chart exposure of 119 seconds with the White\nfilter starting 158 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 100% of the XRT error circle. The typical\n3-sigma upper limit has been about 19.6 mag. The 8'x8' region for\nthe list of sources generated on-board covers 100% of the XRT error\ncircle. The list of sources is typically complete to about 18 mag. No\ncorrection has been made for the expected extinction corresponding to\nE(B-V) of 0.045.\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/35742.",
"published": "2024-02-18T02:18:08.565509Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-18T02:18:08.565546Z",
"modified": "2024-02-18T02:18:08.573006Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6603,
"topic": "gcn.circular",
"uuid": "9af5a795-d462-469f-ad75-13ac489b8513",
"title": "EP240414a: EP-FXT follow-up observation",
"submitter": "Hop gcn.circular",
"authors": "EP Team at NAOC/CAS <ep_ta@bao.ac.cn>",
"data": {
"date": "24/04/16 04:05:44 GMT",
"from": "EP Team at NAOC/CAS <ep_ta@bao.ac.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36129"
},
"title": "GCN CIRCULAR",
"number": "36129",
"subject": "EP240414a: EP-FXT follow-up observation"
},
"message_text": "J. Guan, C. K. Li, Y. Chen, S.M. Jia, W. W. Cui, H. Feng, D. W. Han, W. Li, C. Z. Liu, F. J. Lu, L. M. Song, J. Wang, J. J. Xu, J. Zhang, S. N. Zhang, H. S. Zhao, X. F. Zhao (IHEP, CAS), E. Kuulkers, A. Santovincenzo (ESA), P. O'Brien (Univ. of Leicester), K. Nandra, A. Rau (MPE), B. Cordier (CEA), T. Y. Lian, X. Pan, Z. X. Ling, Y. Liu, H. Sun, D. Y. Li, H. Y. Liu, W. Yuan, C. Zhang (NAOC, CAS) on behalf of the Einstein Probe team\n\nFollowing the detection of the fast X-ray transient EP240414a (Lian et al., GCN 36091) by the Wide-field X-ray Telescope (WXT) of Einstein Probe (EP), we performed an observation with the Follow-up X-ray Telescope (FXT) on board EP. The observation started at 2024-04-14T11:50:01, about 2 hours after the WXT detection, with a net exposure time of 7.2 ks. \n\nAn X-ray source was clearly detected at R.A. = 191.509 deg, Dec. = -9.718 deg, which is R.A. = 12:46:02.16, Dec. = -09:43:04.8, with an uncertainty of 10 arcsec (radius, 90% C.L. statistical and systematic). We note that the source is ~8 arcsec away from the optical transient (OT) which is decaying slowly (Aryan et al., GCN 36094; Xu et al., GCN 36105; Jonker et al., GCN 36110). There is no cataloged X-ray source within the error circle. Considering this FXT detected source being within the error circle of the WXT source (1.5 arcmin away) and being likely associated with the OT, we tend to suggest it to be the late-time X-ray emission from EP240414a. The spectrum can be fitted with an absorbed power-law model with NH fixed at the Galactic value of 3.35e20 cm-2 and a photon index of 1.7(+/-0.3) (90% C.L.). The derived unabsorbed flux in 0.5-10 keV is 3.5(+/-0.8)e-13 erg/s/cm2 (90% C.L.). Assuming this source is indeed associated with EP240414a, its X-ray flux has faded by about 4 orders of magnitude in X-ray flux in about 2 hours since the WXT detection. \n \nPlease note that EP-FXT is currently undergoing in-flight calibration. The derived source parameters may be subject to larger uncertainties, so please use them with caution. Launched on January 9, 2024, EP is a space X-ray observatory to monitor the soft X-ray sky with X-ray follow-up capability (Yuan et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics). EP is a mission of the Chinese Academy of Sciences in collaboration with ESA, MPE and CNES.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36129.",
"published": "2024-04-16T04:05:59.537625Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-16T04:05:59.537636Z",
"modified": "2024-04-16T04:05:59.543691Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6037,
"topic": "gcn.circular",
"uuid": "1a3a7da9-cb44-4505-b3b2-ae7beb02fa15",
"title": "GRB 240218A : r-band upper limit from Observatoire de Haute-Provence",
"submitter": "Hop gcn.circular",
"authors": "Emeric Le Floc'h at CEA-Saclay <emeric.lefloch@cea.fr>",
"data": {
"date": "24/02/18 05:10:36 GMT",
"from": "Emeric Le Floc'h at CEA-Saclay <emeric.lefloch@cea.fr>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35744"
},
"title": "GCN CIRCULAR",
"number": "35744",
"subject": "GRB 240218A : r-band upper limit from Observatoire de Haute-Provence"
},
"message_text": "C. Adami (LAM) and E. Le Floc'h (CEA-Saclay) report on behalf of the MISTRAL GRB collaboration:\n\nWe observed the field of GRB 240218A (Page et al., GCN 35742) using the MISTRAL spectro-imager mounted on the T193 telescope at Observatoire de Haute-Provence (France). We obtained a sequence of 5 images (5min, 10min, 3x15min) for an observation mid-time corresponding to 67min after the GRB) and a total observing time of 1h. Similar to the non detection reported earlier by Malesani et al. (GCN 35743), we did not detect any afterglow candidate consistent with the XRT position, down to the following upper limit :\n\nr > 23 (AB)\n\nThe photometry was calibrated against the PanStarrs catalog within a circle of 2â (radius) around the GRB position.\n\n We acknowledge excellent support from Observatoire de Haute Provence, in particular Yoann Degot Longhi.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35744.",
"published": "2024-02-18T05:10:52.169558Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-18T05:10:52.169581Z",
"modified": "2024-02-18T05:10:52.176894Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6038,
"topic": "gcn.circular",
"uuid": "196ad312-3531-470f-839d-0689009a03fb",
"title": "GRB 240213A: GRBAlpha detection",
"submitter": "Hop gcn.circular",
"authors": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"data": {
"date": "24/02/18 08:52:14 GMT",
"from": "Marianna DafÄÃková at Masaryk University <500025@mail.muni.cz>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35745"
},
"title": "GCN CIRCULAR",
"number": "35745",
"subject": "GRB 240213A: 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 240213A (Fermi/GBM detection: GCN 35718; Glowbug detection: GCN 35728; INTEGRAL/SPI-ACS peak detection at 2024-02-13 ~20:11:35) 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 2024-02-13 20:11:48 UTC. The T90 duration measured by GRBAlpha is 44.5 s and the overall significance during T90 reaches 28 sigma.\n\nThe light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB240213A_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/35745.",
"published": "2024-02-18T08:52:31.036474Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-18T08:52:31.036495Z",
"modified": "2024-02-18T08:52:31.044851Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6039,
"topic": "gcn.circular",
"uuid": "dd35d34a-0ceb-447c-bdbf-5a53abe904b2",
"title": "Gamma-ray flaring activity from the blazar 1ES 1959+650 observed by the Fermi-LAT",
"submitter": "Hop gcn.circular",
"authors": "Sara Buson at DESY, Univ. of Wurzburg <sara.buson@gmail.com>",
"data": {
"date": "24/02/18 09:22:01 GMT",
"from": "Sara Buson at DESY, Univ. of Wurzburg <sara.buson@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35746"
},
"title": "GCN CIRCULAR",
"number": "35746",
"subject": "Gamma-ray flaring activity from the blazar 1ES 1959+650 observed by the Fermi-LAT"
},
"message_text": "S. Buson (DESY; Univ. of Wurzburg) on behalf of the Fermi Large Area Telescope Collaboration\n\nThe LHAASO collaboration has reported the detection of TeV activity from the blazar 1ES 1959+650 (ATel #16437) between MJD 60347.02 / 60348.33 (2024-02-08 00:28:48 / 07:55:12 UTC). Furthermore, enhanced emission has been observed also at X-rays (ATel #16449). The blazar is associated with the >100 MeV gamma-ray source 4FGL J2000.0+6508 (The Fourth Fermi-LAT catalog, Data Release 4; The Fermi-LAT collaboration 2022, ApJS, 260, 53). In the past it has been suggested as a candidate neutrino emitter, after two high-energy neutrinos were detected coincidentally with TeV flares observed by Whipple from the direction of 1ES 1959+650, as reported by the AMANDA collaboration (Halzen and Hooper, 2005).\n\nArchival observations at MeV-GeV energies are available from the Fermi-Large Area Telescope. The source was modelled adopting the LAT catalog shape, i.e. a logparabola model, allowing the flux and spectral parameter alpha to vary in the fit. Integrating the LAT data over the period from 04 August 2008 to 18 February 2024, the observed flux is (5.00 +/- 0.05) x 10^{-8} ph/cm^2/s, and alpha = 1.780 +/- 0.008. A preliminary inspection of the LAT data revels that the blazar displays strong variability at gamma rays, from short to long timescales (days to years timescales). The most prominent flare, occurred as a prolonged, intense activity commencing around 2015. A one-year binned light curve highlights that this enhanced state persisted from approximately MJD 57237 to 59062 (August 2015 to August 2020). The flux peak was observed between August 2015 and August 2016, with an average flux of (1.12 +/- 0.03) x 10^{-7} ph/cm^2/s (>100 MeV, statistical uncertainty only), which is approximately twice the full-mission average flux, and alpha = 1.74 +/- 0.02.\n\nPreliminary analysis integrating recent observations spanning from MJD 60338 to 60357 (January 29 â February 17, 2024), indicates that over the last month, the blazar has been experiencing a high state, with a monthly averaged flux (E>100 MeV) of flux= (1.8 +/- 0.2) x 10^{-7} ph/cm^2/s, and alpha = 1.67 +/- 0.05. This represents an increase of approximately four times the average flux reported in the fourth Fermi LAT source catalog and is comparable in brightness to the monthly-average flaring activity observed in 2015/2016. Upon integrating the LAT data over the time interval (~one day) corresponding to the detection of gamma rays by LHAASO, the LAT observed flux is (3.8 +/- 0.8) x 10^{-7} ph/cm^2/s and alpha = 1.72 +/- 0.12. No significant changes are observed in the spectral shape of the source at gamma rays.\n\nWe strongly encourage multiwavelength observations of this source. Since Fermi normally operates in an all-sky scanning mode, regular monitoring of this source will continue. For this source the Fermi-LAT contact person is Sara Buson (sara.buson at desy.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/35746.",
"published": "2024-02-18T09:22:15.611709Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-18T09:22:15.611746Z",
"modified": "2024-02-18T09:22:15.621867Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6040,
"topic": "gcn.circular",
"uuid": "e1daa745-8cd5-41d7-9642-07a21ccac356",
"title": "GRB 240218A: REM detection of a NIR afterglow candidate",
"submitter": "Hop gcn.circular",
"authors": "Paolo D'Avanzo at INAF-OAB <pda.davanzo@gmail.com>",
"data": {
"date": "24/02/18 11:08:05 GMT",
"from": "Paolo D'Avanzo at INAF-OAB <pda.davanzo@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35747"
},
"title": "GCN CIRCULAR",
"number": "35747",
"subject": "GRB 240218A: REM detection of a NIR afterglow candidate"
},
"message_text": "P. DâAvanzo, M. Ferro, R. Brivio, Y.-D. Hu, D. Fugazza, S. Covino (INAF-OAB) on behalf of the REM team, report:\n\n\nWe observed the field of GRB 240218A (Page et al., GCN 35742) with the REM 60cm robotic telescope located at the ESO Observatory of La Silla (Chile). \nThe observations were carried out in the g, r, i, z, H bands, starting on 2024 Feb 18 at 02:01:08 UT (i.e. 68 seconds after the burst T0) and lasted for about 3 hours.\n\nAn uncatalogued, fading source is detected in the initial H REM images. The source is not detected in the optical filters. \nFrom preliminary astrometry we obtain the following position:\nRA (J2000) = 10:47:11.50\nDec (J2000) = +01:16:38.0\n\n(+/- 0.5â). \n\nThis position is located at the South-East edge of the 3.8â radius XRT error circle (https://www.swift.ac.uk/xrt_unenh_positions/01215912/ <https://www.swift.ac.uk/xrt_unenh_positions/01215912/>)\n\nFrom preliminary analysis we derive:\nH = 14.7 +/- 0.2 mag, at a mid time of t-t0 ~ 103 s after the GRB T0.\nH = 15.8 +/ -0.2 mag, at a mid time of t-t0 ~ 511 s after the GRB T0.\n\nMagnitudes are in the Vega system and calibrated against the 2MASS catalogue. \n\nThe optical magnitude limits reported by Malesani et al. (GCN Circ. 35743), although obtained about 1 hour after the REM detection, may imply a significant red color \nfor the afterglow (r - H > 4 mag, assuming the same decay from ~ 100 s to 3600 s after the GRB T0). In light of the low Galactic extinction along the GRB line of sight \nand of the absence of evidence for intrinsic N(H) excess in the X-ray afterglow spectrum obtained by Swift/XRT (https://www.swift.ac.uk/xrt_spectra/01215912/ <https://www.swift.ac.uk/xrt_spectra/01215912/>), \nwe suggest that GRB 240218 can be a high-redshift event. \nFurther follow-up, especially in the NIR bands, is encouraged.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35747.",
"published": "2024-02-18T11:08:22.342078Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-18T11:08:22.342108Z",
"modified": "2024-02-18T11:08:22.350753Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6041,
"topic": "gcn.circular",
"uuid": "8dccfd3d-8d88-4615-8e27-a3ce07103945",
"title": "GRB 240218A: Enhanced Swift-XRT position",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/02/18 12:09:38 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35748"
},
"title": "GCN CIRCULAR",
"number": "35748",
"subject": "GRB 240218A: 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 75 s of XRT Photon Counting mode data and 1 UVOT\nimages for GRB 240218A, 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 = 161.79682, +1.27634 which is equivalent\nto:\n\nRA (J2000): 10h 47m 11.24s\nDec (J2000): +01d 16' 34.8\"\n\nwith an uncertainty of 4.2 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/35748.",
"published": "2024-02-18T12:09:52.792436Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-18T12:09:52.792459Z",
"modified": "2024-02-18T12:09:52.801603Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6042,
"topic": "gcn.circular",
"uuid": "1fb6ccf6-3466-4f72-8820-91171114947e",
"title": "GRB 240218A: VLT/FORS2 z-band detection",
"submitter": "Hop gcn.circular",
"authors": "Daniele B. Malesani at IMAPP / Radboud University <d.malesani@astro.ru.nl>",
"data": {
"date": "24/02/18 15:18:26 GMT",
"from": "Daniele B. Malesani at IMAPP / Radboud University <d.malesani@astro.ru.nl>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35749"
},
"title": "GCN CIRCULAR",
"number": "35749",
"subject": "GRB 240218A: VLT/FORS2 z-band detection"
},
"message_text": "We observed the near-infrared counterpart of GRB 240218A (Page et al., GCN 35742; D'Avanzo et al., GCN 35747) using the ESO VLT UT1 (Kueyen) equipped with the FORS2 imager. Observations were carried out in the Gunn z filter.\n\nThe GRB counterpart discovered by REM (D'Avanzo et al., GCN 35747) is well detected in the coaddition of our images (1080 s exposure time), at a mean epoch Feb 18.205 UT (2.925 hr after the GRB). Calibrated against nearby stars from the Pan-STARRS catalog, we preliminarily measure a magnitude z = 23.8 +- 0.15 (AB).\n\nWe acknowledge expert support from the VLT observing staff in Paranal, in particular Thomas Szeifert, Jonathan Smoker, Martina Baratella, and Juan Carlos Olivares.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35749.",
"published": "2024-02-18T15:18:41.321364Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-18T15:18:41.321394Z",
"modified": "2024-02-18T15:18:41.331373Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6043,
"topic": "gcn.circular",
"uuid": "ef40978e-41b2-4abc-8415-58a42d931f80",
"title": "Fermi trigger No 729914426: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "24/02/18 16:32:52 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35750"
},
"title": "GCN CIRCULAR",
"number": "35750",
"subject": "Fermi trigger No 729914426: 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 GRB240218.08 (trigger No 729914426,10h 51m 48.00s , +06d 32m 24.0s, R=3.89) errorbox 34 sec after trigger time at 2024-02-18 02:00:55 UT, with upper limit up to 19.0 mag. The observations began at zenith distance = 47 deg. The sun altitude is -27.1 deg.\n\nMASTER-Tunka robotic telescope located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB240218.08 errorbox 37684 sec after notice time and 37722 sec after trigger time at 2024-02-18 12:29:04 UT, with upper limit up to 19.0 mag. The observations began at zenith distance = 85 deg. The sun altitude is -19.9 deg.\n\nMASTER-Amur robotic telescope located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the Fermi GRB240218.08 errorbox 49246 sec after notice time and 49285 sec after trigger time at 2024-02-18 15:41:47 UT, with upper limit up to 17.7 mag. The observations began at zenith distance = 45 deg. The sun altitude is -51.8 deg.\n\nThe galactic latitude b = 55 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#80908\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 39 | 2024-02-18 02:00:55 | MASTER-SAAO | (10h 50m 07.13s , +01d 17m 55.9s) | P/ | 10 | 17.5 |\n 183 | 2024-02-18 02:03:04 | MASTER-SAAO | (10h 50m 06.48s , +01d 18m 09.8s) | P/ | 40 | 18.7 |\n 298 | 2024-02-18 02:04:50 | MASTER-SAAO | (10h 41m 35.81s , +01d 29m 58.1s) | P\\\\ | 60 | 18.2 |\n 358 | 2024-02-18 02:04:50 | MASTER-SAAO | (10h 41m 35.81s , +01d 29m 58.0s) | P\\\\ | 180 | 18.9 | Coadd\n 298 | 2024-02-18 02:04:50 | MASTER-SAAO | (10h 50m 05.62s , +01d 18m 14.5s) | P/ | 60 | 18.1 |\n 378 | 2024-02-18 02:06:09 | MASTER-SAAO | (10h 41m 35.48s , +01d 30m 03.7s) | P\\\\ | 60 | 18.2 |\n 378 | 2024-02-18 02:06:09 | MASTER-SAAO | (10h 50m 05.23s , +01d 18m 20.0s) | P/ | 60 | 18.1 |\n 438 | 2024-02-18 02:06:09 | MASTER-SAAO | (10h 50m 05.23s , +01d 18m 19.9s) | P/ | 180 | 19.0 | Coadd\n 457 | 2024-02-18 02:07:29 | MASTER-SAAO | (10h 41m 35.13s , +01d 30m 08.3s) | P\\\\ | 60 | 18.4 |\n 457 | 2024-02-18 02:07:29 | MASTER-SAAO | (10h 50m 04.84s , +01d 18m 24.6s) | P/ | 60 | 18.1 |\n 537 | 2024-02-18 02:08:48 | MASTER-SAAO | (10h 41m 34.80s , +01d 30m 12.7s) | P\\\\ | 60 | 18.3 |\n 597 | 2024-02-18 02:08:48 | MASTER-SAAO | (10h 41m 34.80s , +01d 30m 12.7s) | P\\\\ | 180 | 19.0 | Coadd\n 537 | 2024-02-18 02:08:48 | MASTER-SAAO | (10h 50m 04.48s , +01d 18m 29.0s) | P/ | 60 | 18.3 |\n 616 | 2024-02-18 02:10:07 | MASTER-SAAO | (10h 41m 34.48s , +01d 30m 16.5s) | P\\\\ | 60 | 18.3 |\n 616 | 2024-02-18 02:10:08 | MASTER-SAAO | (10h 50m 04.15s , +01d 18m 32.9s) | P/ | 60 | 18.1 |\n 676 | 2024-02-18 02:10:08 | MASTER-SAAO | (10h 50m 04.14s , +01d 18m 32.7s) | P/ | 180 | 19.0 | Coadd\n 696 | 2024-02-18 02:11:27 | MASTER-SAAO | (10h 41m 34.17s , +01d 30m 20.3s) | P\\\\ | 60 | 18.3 |\n 696 | 2024-02-18 02:11:27 | MASTER-SAAO | (10h 50m 03.80s , +01d 18m 36.4s) | P/ | 60 | 18.2 |\n 775 | 2024-02-18 02:12:46 | MASTER-SAAO | (10h 41m 33.85s , +01d 30m 23.8s) | P\\\\ | 60 | 18.3 |\n 835 | 2024-02-18 02:12:46 | MASTER-SAAO | (10h 41m 33.85s , +01d 30m 23.8s) | P\\\\ | 180 | 18.9 | Coadd\n 775 | 2024-02-18 02:12:47 | MASTER-SAAO | (10h 50m 03.47s , +01d 18m 39.9s) | P/ | 60 | 18.1 |\n 855 | 2024-02-18 02:14:06 | MASTER-SAAO | (10h 41m 33.52s , +01d 30m 27.1s) | P\\\\ | 60 | 18.3 |\n 855 | 2024-02-18 02:14:06 | MASTER-SAAO | (10h 50m 03.11s , +01d 18m 43.1s) | P/ | 60 | 18.2 |\n 915 | 2024-02-18 02:14:06 | MASTER-SAAO | (10h 50m 03.12s , +01d 18m 43.1s) | P/ | 180 | 18.9 | Coadd\n 934 | 2024-02-18 02:15:25 | MASTER-SAAO | (10h 41m 33.18s , +01d 30m 30.5s) | P\\\\ | 60 | 18.3 |\n 934 | 2024-02-18 02:15:25 | MASTER-SAAO | (10h 50m 02.77s , +01d 18m 46.5s) | P/ | 60 | 18.3 |\n 1014 | 2024-02-18 02:16:45 | MASTER-SAAO | (10h 41m 32.86s , +01d 30m 33.8s) | P\\\\ | 60 | 18.3 |\n 1074 | 2024-02-18 02:16:45 | MASTER-SAAO | (10h 41m 32.86s , +01d 30m 33.9s) | P\\\\ | 180 | 18.9 | Coadd\n 1014 | 2024-02-18 02:16:45 | MASTER-SAAO | (10h 50m 02.40s , +01d 18m 49.9s) | P/ | 60 | 18.1 |\n 1093 | 2024-02-18 02:18:04 | MASTER-SAAO | (10h 41m 32.53s , +01d 30m 37.1s) | P\\\\ | 60 | 18.3 |\n 1093 | 2024-02-18 02:18:05 | MASTER-SAAO | (10h 50m 02.05s , +01d 18m 52.9s) | P/ | 60 | 18.3 |\n 1153 | 2024-02-18 02:18:05 | MASTER-SAAO | (10h 50m 02.05s , +01d 18m 52.9s) | P/ | 180 | 18.9 | Coadd\n 1173 | 2024-02-18 02:19:24 | MASTER-SAAO | (10h 41m 32.20s , +01d 30m 40.3s) | P\\\\ | 60 | 18.2 |\n 1173 | 2024-02-18 02:19:24 | MASTER-SAAO | (10h 50m 01.70s , +01d 18m 55.8s) | P/ | 60 | 18.3 |\n 1252 | 2024-02-18 02:20:43 | MASTER-SAAO | (10h 41m 31.88s , +01d 30m 43.8s) | P\\\\ | 60 | 18.3 |\n 1312 | 2024-02-18 02:20:43 | MASTER-SAAO | (10h 41m 31.89s , +01d 30m 43.8s) | P\\\\ | 180 | 18.9 | Coadd\n 1252 | 2024-02-18 02:20:43 | MASTER-SAAO | (10h 50m 01.34s , +01d 18m 59.1s) | P/ | 60 | 18.3 |\n 1331 | 2024-02-18 02:22:03 | MASTER-SAAO | (10h 41m 31.56s , +01d 30m 46.8s) | P\\\\ | 60 | 18.3 |\n 1331 | 2024-02-18 02:22:03 | MASTER-SAAO | (10h 50m 01.00s , +01d 19m 02.2s) | P/ | 60 | 18.3 |\n 1391 | 2024-02-18 02:22:03 | MASTER-SAAO | (10h 50m 01.01s , +01d 19m 02.2s) | P/ | 180 | 18.8 | Coadd\n 1411 | 2024-02-18 02:23:22 | MASTER-SAAO | (10h 41m 31.24s , +01d 30m 49.8s) | P\\\\ | 60 | 18.3 |\n 1411 | 2024-02-18 02:23:22 | MASTER-SAAO | (10h 50m 00.65s , +01d 19m 05.3s) | P/ | 60 | 18.1 |\n 1510 | 2024-02-18 02:25:02 | MASTER-SAAO | (10h 41m 30.85s , +01d 30m 53.4s) | P\\\\ | 60 | 18.2 |\n 1570 | 2024-02-18 02:25:02 | MASTER-SAAO | (10h 41m 30.85s , +01d 30m 53.5s) | P\\\\ | 180 | 19.0 | Coadd\n 1510 | 2024-02-18 02:25:02 | MASTER-SAAO | (10h 50m 00.22s , +01d 19m 09.3s) | P/ | 60 | 18.1 |\n 1590 | 2024-02-18 02:26:21 | MASTER-SAAO | (10h 41m 30.53s , +01d 30m 56.7s) | P\\\\ | 60 | 18.3 |\n 1590 | 2024-02-18 02:26:21 | MASTER-SAAO | (10h 49m 59.88s , +01d 19m 12.3s) | P/ | 60 | 18.2 |\n 1650 | 2024-02-18 02:26:21 | MASTER-SAAO | (10h 49m 59.89s , +01d 19m 12.2s) | P/ | 180 | 18.8 | Coadd\n 1670 | 2024-02-18 02:27:41 | MASTER-SAAO | (10h 41m 30.22s , +01d 30m 59.8s) | P\\\\ | 60 | 18.3 |\n 1670 | 2024-02-18 02:27:41 | MASTER-SAAO | (10h 49m 59.53s , +01d 19m 15.4s) | P/ | 60 | 18.1 |\n 1749 | 2024-02-18 02:29:00 | MASTER-SAAO | (10h 41m 29.89s , +01d 31m 03.1s) | P\\\\ | 60 | 18.3 |\n 1809 | 2024-02-18 02:29:00 | MASTER-SAAO | (10h 41m 29.90s , +01d 31m 03.0s) | P\\\\ | 180 | 18.9 | Coadd\n 1749 | 2024-02-18 02:29:01 | MASTER-SAAO | (10h 49m 59.21s , +01d 19m 18.5s) | P/ | 60 | 18.3 |\n 1829 | 2024-02-18 02:30:21 | MASTER-SAAO | (10h 41m 29.60s , +01d 31m 06.2s) | P\\\\ | 60 | 18.3 |\n 1829 | 2024-02-18 02:30:21 | MASTER-SAAO | (10h 49m 58.88s , +01d 19m 21.4s) | P/ | 60 | 18.3 |\n 1889 | 2024-02-18 02:30:21 | MASTER-SAAO | (10h 49m 58.88s , +01d 19m 21.4s) | P/ | 180 | 18.9 | Coadd\n 1909 | 2024-02-18 02:31:40 | MASTER-SAAO | (10h 41m 29.30s , +01d 31m 09.3s) | P\\\\ | 60 | 18.3 |\n 1909 | 2024-02-18 02:31:40 | MASTER-SAAO | (10h 49m 58.55s , +01d 19m 24.5s) | P/ | 60 | 18.3 |\n 1988 | 2024-02-18 02:33:00 | MASTER-SAAO | (10h 41m 29.01s , +01d 31m 12.8s) | P\\\\ | 60 | 18.3 |\n 2048 | 2024-02-18 02:33:00 | MASTER-SAAO | (10h 41m 29.01s , +01d 31m 12.7s) | P\\\\ | 180 | 19.0 | Coadd\n 1988 | 2024-02-18 02:33:00 | MASTER-SAAO | (10h 49m 58.23s , +01d 19m 27.9s) | P/ | 60 | 18.2 |\n 2068 | 2024-02-18 02:34:19 | MASTER-SAAO | (10h 41m 28.72s , +01d 31m 15.6s) | P\\\\ | 60 | 18.2 |\n 2068 | 2024-02-18 02:34:19 | MASTER-SAAO | (10h 49m 57.92s , +01d 19m 30.6s) | P/ | 60 | 18.2 |\n 2128 | 2024-02-18 02:34:19 | MASTER-SAAO | (10h 49m 57.92s , +01d 19m 30.6s) | P/ | 180 | 19.0 | Coadd\n 2147 | 2024-02-18 02:35:38 | MASTER-SAAO | (10h 41m 28.44s , +01d 31m 18.8s) | P\\\\ | 60 | 18.2 |\n 2147 | 2024-02-18 02:35:38 | MASTER-SAAO | (10h 49m 57.61s , +01d 19m 33.7s) | P/ | 60 | 18.2 |\n 2226 | 2024-02-18 02:36:58 | MASTER-SAAO | (10h 41m 28.18s , +01d 31m 21.9s) | P\\\\ | 60 | 18.2 |\n 2286 | 2024-02-18 02:36:58 | MASTER-SAAO | (10h 41m 28.18s , +01d 31m 21.8s) | P\\\\ | 180 | 18.9 | Coadd\n 2226 | 2024-02-18 02:36:58 | MASTER-SAAO | (10h 49m 57.29s , +01d 19m 36.9s) | P/ | 60 | 18.2 |\n 2306 | 2024-02-18 02:38:17 | MASTER-SAAO | (10h 49m 57.00s , +01d 19m 39.8s) | P/ | 60 | 18.3 |\n 2366 | 2024-02-18 02:38:17 | MASTER-SAAO | (10h 49m 57.00s , +01d 19m 39.7s) | P/ | 180 | 19.0 | Coadd\n 2306 | 2024-02-18 02:38:17 | MASTER-SAAO | (10h 41m 27.91s , +01d 31m 25.0s) | P\\\\ | 60 | 18.3 |\n 2386 | 2024-02-18 02:39:37 | MASTER-SAAO | (10h 49m 56.70s , +01d 19m 43.2s) | P/ | 60 | 18.1 |\n 2386 | 2024-02-18 02:39:37 | MASTER-SAAO | (10h 41m 27.67s , +01d 31m 28.5s) | P\\\\ | 60 | 18.3 |\n 2465 | 2024-02-18 02:40:56 | MASTER-SAAO | (10h 49m 56.39s , +01d 19m 46.4s) | P/ | 60 | 18.3 |\n 2465 | 2024-02-18 02:40:56 | MASTER-SAAO | (10h 41m 27.41s , +01d 31m 31.7s) | P\\\\ | 60 | 18.3 |\n 2525 | 2024-02-18 02:40:56 | MASTER-SAAO | (10h 41m 27.41s , +01d 31m 31.7s) | P\\\\ | 180 | 19.0 | Coadd\n 2544 | 2024-02-18 02:42:16 | MASTER-SAAO | (10h 49m 56.13s , +01d 19m 49.3s) | P/ | 60 | 18.2 |\n 2604 | 2024-02-18 02:42:16 | MASTER-SAAO | (10h 49m 56.13s , +01d 19m 49.2s) | P/ | 180 | 18.8 | Coadd\n 2544 | 2024-02-18 02:42:16 | MASTER-SAAO | (10h 41m 27.17s , +01d 31m 34.6s) | P\\\\ | 60 | 18.3 |\n 2624 | 2024-02-18 02:43:36 | MASTER-SAAO | (10h 49m 55.86s , +01d 19m 52.3s) | P/ | 60 | 18.1 |\n 2624 | 2024-02-18 02:43:36 | MASTER-SAAO | (10h 41m 26.93s , +01d 31m 37.5s) | P\\\\ | 60 | 18.0 |\n 2704 | 2024-02-18 02:44:55 | MASTER-SAAO | (10h 49m 55.61s , +01d 19m 55.9s) | P/ | 60 | 18.5 |\n 2704 | 2024-02-18 02:44:55 | MASTER-SAAO | (10h 41m 26.73s , +01d 31m 41.2s) | P\\\\ | 60 | 18.5 |\n 2764 | 2024-02-18 02:44:55 | MASTER-SAAO | (10h 41m 26.74s , +01d 31m 41.1s) | P\\\\ | 180 | 18.9 | Coadd\n 2783 | 2024-02-18 02:46:14 | MASTER-SAAO | (10h 49m 55.32s , +01d 19m 58.9s) | P/ | 60 | 18.3 |\n 2843 | 2024-02-18 02:46:14 | MASTER-SAAO | (10h 49m 55.32s , +01d 19m 58.9s) | P/ | 180 | 18.8 | Coadd\n 2783 | 2024-02-18 02:46:14 | MASTER-SAAO | (10h 41m 26.52s , +01d 31m 44.2s) | P\\\\ | 60 | 18.2 |\n 2863 | 2024-02-18 02:47:34 | MASTER-SAAO | (10h 49m 55.09s , +01d 20m 01.9s) | P/ | 60 | 18.2 |\n 2863 | 2024-02-18 02:47:34 | MASTER-SAAO | (10h 41m 26.32s , +01d 31m 47.3s) | P\\\\ | 60 | 18.3 |\n 2942 | 2024-02-18 02:48:53 | MASTER-SAAO | (10h 49m 54.85s , +01d 20m 05.1s) | P/ | 60 | 18.1 |\n 2942 | 2024-02-18 02:48:53 | MASTER-SAAO | (10h 41m 26.12s , +01d 31m 50.6s) | P\\\\ | 60 | 18.2 |\n 3002 | 2024-02-18 02:48:53 | MASTER-SAAO | (10h 41m 26.12s , +01d 31m 50.6s) | P\\\\ | 180 | 18.9 | Coadd\n 3022 | 2024-02-18 02:50:13 | MASTER-SAAO | (10h 49m 54.66s , +01d 20m 07.8s) | P/ | 60 | 18.1 |\n 3082 | 2024-02-18 02:50:13 | MASTER-SAAO | (10h 49m 54.67s , +01d 20m 07.7s) | P/ | 180 | 19.0 | Coadd\n 3022 | 2024-02-18 02:50:13 | MASTER-SAAO | (10h 41m 25.93s , +01d 31m 53.8s) | P\\\\ | 60 | 18.2 |\n 3101 | 2024-02-18 02:51:32 | MASTER-SAAO | (10h 49m 54.46s , +01d 20m 11.0s) | P/ | 60 | 18.1 |\n 3101 | 2024-02-18 02:51:32 | MASTER-SAAO | (10h 41m 25.77s , +01d 31m 57.1s) | P\\\\ | 60 | 18.2 |\n 3180 | 2024-02-18 02:52:52 | MASTER-SAAO | (10h 49m 54.26s , +01d 20m 13.8s) | P/ | 60 | 18.3 |\n 3180 | 2024-02-18 02:52:52 | MASTER-SAAO | (10h 41m 25.61s , +01d 32m 00.1s) | P\\\\ | 60 | 18.2 |\n 3240 | 2024-02-18 02:52:52 | MASTER-SAAO | (10h 41m 25.61s , +01d 32m 00.1s) | P\\\\ | 180 | 18.9 | Coadd\n 3260 | 2024-02-18 02:54:11 | MASTER-SAAO | (10h 41m 25.46s , +01d 32m 03.6s) | P\\\\ | 60 | 18.2 |\n 3260 | 2024-02-18 02:54:11 | MASTER-SAAO | (10h 49m 54.06s , +01d 20m 17.2s) | P/ | 60 | 18.1 |\n 3320 | 2024-02-18 02:54:11 | MASTER-SAAO | (10h 49m 54.07s , +01d 20m 17.1s) | P/ | 180 | 18.8 | Coadd\n 3340 | 2024-02-18 02:55:31 | MASTER-SAAO | (10h 49m 53.91s , +01d 20m 19.7s) | P/ | 60 | 18.0 |\n 3340 | 2024-02-18 02:55:31 | MASTER-SAAO | (10h 41m 25.31s , +01d 32m 06.5s) | P\\\\ | 60 | 18.3 |\n 3419 | 2024-02-18 02:56:50 | MASTER-SAAO | (10h 49m 53.73s , +01d 20m 23.0s) | P/ | 60 | 18.1 |\n 3419 | 2024-02-18 02:56:50 | MASTER-SAAO | (10h 41m 25.19s , +01d 32m 09.9s) | P\\\\ | 60 | 18.2 |\n 3479 | 2024-02-18 02:56:50 | MASTER-SAAO | (10h 41m 25.18s , +01d 32m 09.9s) | P\\\\ | 180 | 18.9 | Coadd\n 3499 | 2024-02-18 02:58:10 | MASTER-SAAO | (10h 49m 53.60s , +01d 20m 26.1s) | P/ | 60 | 18.0 |\n 3559 | 2024-02-18 02:58:10 | MASTER-SAAO | (10h 49m 53.59s , +01d 20m 26.1s) | P/ | 180 | 18.8 | Coadd\n 3499 | 2024-02-18 02:58:10 | MASTER-SAAO | (10h 41m 25.07s , +01d 32m 13.0s) | P\\\\ | 60 | 18.0 |\n 3578 | 2024-02-18 02:59:29 | MASTER-SAAO | (10h 41m 24.96s , +01d 32m 15.9s) | P\\\\ | 60 | 18.0 |\n 3578 | 2024-02-18 02:59:29 | MASTER-SAAO | (10h 49m 53.48s , +01d 20m 28.7s) | P/ | 60 | 18.1 |\n 3657 | 2024-02-18 03:00:49 | MASTER-SAAO | (10h 49m 53.33s , +01d 20m 32.1s) | P/ | 60 | 18.0 |\n 3657 | 2024-02-18 03:00:49 | MASTER-SAAO | (10h 41m 24.88s , +01d 32m 19.3s) | P\\\\ | 60 | 18.0 |\n 3717 | 2024-02-18 03:00:49 | MASTER-SAAO | (10h 41m 24.88s , +01d 32m 19.3s) | P\\\\ | 180 | 18.8 | Coadd\n 3737 | 2024-02-18 03:02:08 | MASTER-SAAO | (10h 49m 53.19s , +01d 20m 35.2s) | P/ | 60 | 18.1 |\n 3797 | 2024-02-18 03:02:08 | MASTER-SAAO | (10h 49m 53.20s , +01d 20m 35.2s) | P/ | 180 | 18.9 | Coadd\n 3737 | 2024-02-18 03:02:08 | MASTER-SAAO | (10h 41m 24.79s , +01d 32m 22.4s) | P\\\\ | 60 | 17.7 |\n 3816 | 2024-02-18 03:03:27 | MASTER-SAAO | (10h 41m 24.73s , +01d 32m 25.6s) | P\\\\ | 60 | 18.1 |\n 3816 | 2024-02-18 03:03:27 | MASTER-SAAO | (10h 49m 53.12s , +01d 20m 38.3s) | P/ | 60 | 17.9 |\n 3895 | 2024-02-18 03:04:47 | MASTER-SAAO | (10h 49m 53.03s , +01d 20m 41.4s) | P/ | 60 | 17.9 |\n 3895 | 2024-02-18 03:04:47 | MASTER-SAAO | (10h 41m 24.68s , +01d 32m 28.7s) | P\\\\ | 60 | 17.7 |\n 3955 | 2024-02-18 03:04:47 | MASTER-SAAO | (10h 41m 24.68s , +01d 32m 28.7s) | P\\\\ | 180 | 18.6 | Coadd\n 3975 | 2024-02-18 03:06:06 | MASTER-SAAO | (10h 49m 52.97s , +01d 20m 44.5s) | P/ | 60 | 17.9 |\n 4035 | 2024-02-18 03:06:06 | MASTER-SAAO | (10h 49m 52.97s , +01d 20m 44.6s) | P/ | 180 | 18.8 | Coadd\n 3975 | 2024-02-18 03:06:06 | MASTER-SAAO | (10h 41m 24.64s , +01d 32m 31.8s) | P\\\\ | 60 | 17.6 |\n 4055 | 2024-02-18 03:07:26 | MASTER-SAAO | (10h 49m 52.90s , +01d 20m 47.7s) | P/ | 60 | 17.8 |\n 4055 | 2024-02-18 03:07:26 | MASTER-SAAO | (10h 41m 24.62s , +01d 32m 35.0s) | P\\\\ | 60 | 17.7 |\n 4134 | 2024-02-18 03:08:45 | MASTER-SAAO | (10h 41m 24.63s , +01d 32m 38.2s) | P\\\\ | 60 | 17.6 |\n 4194 | 2024-02-18 03:08:45 | MASTER-SAAO | (10h 41m 24.63s , +01d 32m 38.0s) | P\\\\ | 180 | 18.5 | Coadd\n 4134 | 2024-02-18 03:08:45 | MASTER-SAAO | (10h 49m 52.86s , +01d 20m 50.5s) | P/ | 60 | 17.8 |\n 4213 | 2024-02-18 03:10:05 | MASTER-SAAO | (10h 49m 52.84s , +01d 20m 53.4s) | P/ | 60 | 17.8 |\n 4273 | 2024-02-18 03:10:05 | MASTER-SAAO | (10h 49m 52.84s , +01d 20m 53.5s) | P/ | 180 | 18.8 | Coadd\n 4213 | 2024-02-18 03:10:05 | MASTER-SAAO | (10h 41m 24.64s , +01d 32m 41.4s) | P\\\\ | 60 | 17.6 |\n 4293 | 2024-02-18 03:11:24 | MASTER-SAAO | (10h 49m 52.81s , +01d 20m 56.5s) | P/ | 60 | 17.8 |\n 4293 | 2024-02-18 03:11:24 | MASTER-SAAO | (10h 41m 24.66s , +01d 32m 44.5s) | P\\\\ | 60 | 17.6 |\n 4372 | 2024-02-18 03:12:44 | MASTER-SAAO | (10h 49m 52.82s , +01d 20m 59.4s) | P/ | 60 | 17.8 |\n 4372 | 2024-02-18 03:12:44 | MASTER-SAAO | (10h 41m 24.69s , +01d 32m 47.8s) | P\\\\ | 60 | 17.6 |\n 4432 | 2024-02-18 03:12:44 | MASTER-SAAO | (10h 41m 24.69s , +01d 32m 47.8s) | P\\\\ | 180 | 18.3 | Coadd\n 4452 | 2024-02-18 03:14:03 | MASTER-SAAO | (10h 41m 24.75s , +01d 32m 50.8s) | P\\\\ | 60 | 17.5 |\n 4452 | 2024-02-18 03:14:03 | MASTER-SAAO | (10h 49m 52.89s , +01d 21m 02.1s) | P/ | 60 | 17.7 |\n 4512 | 2024-02-18 03:14:03 | MASTER-SAAO | (10h 49m 52.89s , +01d 21m 02.1s) | P/ | 180 | 18.1 | Coadd\n 4531 | 2024-02-18 03:15:23 | MASTER-SAAO | (10h 49m 52.94s , +01d 21m 05.1s) | P/ | 60 | 17.7 |\n 4531 | 2024-02-18 03:15:23 | MASTER-SAAO | (10h 41m 24.82s , +01d 32m 53.7s) | P\\\\ | 60 | 17.4 |\n 4611 | 2024-02-18 03:16:42 | MASTER-SAAO | (10h 49m 53.00s , +01d 21m 08.0s) | P/ | 60 | 17.3 |\n 4611 | 2024-02-18 03:16:42 | MASTER-SAAO | (10h 41m 24.93s , +01d 32m 57.0s) | P\\\\ | 60 | 17.3 |\n 4671 | 2024-02-18 03:16:42 | MASTER-SAAO | (10h 41m 24.93s , +01d 32m 56.9s) | P\\\\ | 180 | 17.7 | Coadd\n 4690 | 2024-02-18 03:18:01 | MASTER-SAAO | (10h 49m 53.07s , +01d 21m 11.2s) | P/ | 60 | 17.3 |\n 4750 | 2024-02-18 03:18:01 | MASTER-SAAO | (10h 49m 53.07s , +01d 21m 11.2s) | P/ | 180 | 17.8 | Coadd\n 4690 | 2024-02-18 03:18:01 | MASTER-SAAO | (10h 41m 25.04s , +01d 32m 60.0s) | P\\\\ | 60 | 17.3 |\n 4770 | 2024-02-18 03:19:21 | MASTER-SAAO | (10h 49m 53.20s , +01d 21m 13.8s) | P/ | 60 | 17.0 |\n 4770 | 2024-02-18 03:19:21 | MASTER-SAAO | (10h 41m 25.18s , +01d 33m 03.1s) | P\\\\ | 60 | 16.8 |\n 4849 | 2024-02-18 03:20:40 | MASTER-SAAO | (10h 41m 25.32s , +01d 33m 06.3s) | P\\\\ | 60 | 16.8 |\n 4909 | 2024-02-18 03:20:40 | MASTER-SAAO | (10h 41m 25.32s , +01d 33m 06.2s) | P\\\\ | 180 | 17.3 | Coadd\n 4849 | 2024-02-18 03:20:40 | MASTER-SAAO | (10h 49m 53.32s , +01d 21m 16.8s) | P/ | 60 | 16.9 |\n 4929 | 2024-02-18 03:22:00 | MASTER-SAAO | (10h 49m 53.43s , +01d 21m 19.8s) | P/ | 60 | 16.9 |\n 4989 | 2024-02-18 03:22:00 | MASTER-SAAO | (10h 49m 53.44s , +01d 21m 19.8s) | P/ | 180 | 16.9 | Coadd\n 4929 | 2024-02-18 03:22:00 | MASTER-SAAO | (10h 41m 25.50s , +01d 33m 09.5s) | P\\\\ | 60 | 16.6 |\n 5008 | 2024-02-18 03:23:19 | MASTER-SAAO | (10h 49m 53.63s , +01d 21m 22.8s) | P/ | 60 | 16.6 |\n 5008 | 2024-02-18 03:23:19 | MASTER-SAAO | (10h 41m 25.72s , +01d 33m 12.6s) | P\\\\ | 60 | 16.5 |\n 5088 | 2024-02-18 03:24:39 | MASTER-SAAO | (10h 49m 53.80s , +01d 21m 25.5s) | P/ | 60 | 16.6 |\n 5088 | 2024-02-18 03:24:39 | MASTER-SAAO | (10h 41m 25.94s , +01d 33m 15.5s) | P\\\\ | 60 | 16.2 |\n 5148 | 2024-02-18 03:24:39 | MASTER-SAAO | (10h 41m 25.94s , +01d 33m 15.5s) | P\\\\ | 180 | 16.5 | Coadd\n 5167 | 2024-02-18 03:25:59 | MASTER-SAAO | (10h 49m 54.01s , +01d 21m 28.7s) | P/ | 60 | 16.3 |\n 5227 | 2024-02-18 03:25:59 | MASTER-SAAO | (10h 49m 54.01s , +01d 21m 28.9s) | P/ | 180 | 16.5 | Coadd\n 5167 | 2024-02-18 03:25:59 | MASTER-SAAO | (10h 41m 26.19s , +01d 33m 18.8s) | P\\\\ | 60 | 16.1 |\n 5247 | 2024-02-18 03:27:18 | MASTER-SAAO | (10h 49m 54.25s , +01d 21m 31.4s) | P/ | 60 | 16.1 |\n 5247 | 2024-02-18 03:27:18 | MASTER-SAAO | (10h 41m 26.43s , +01d 33m 21.6s) | P\\\\ | 60 | 16.1 |\n 5327 | 2024-02-18 03:28:38 | MASTER-SAAO | (10h 49m 54.49s , +01d 21m 34.1s) | P/ | 60 | 15.7 |\n 5327 | 2024-02-18 03:28:38 | MASTER-SAAO | (10h 41m 26.70s , +01d 33m 24.5s) | P\\\\ | 60 | 15.5 |\n 5387 | 2024-02-18 03:28:38 | MASTER-SAAO | (10h 41m 26.66s , +01d 33m 23.4s) | P\\\\ | 180 | 15.3 | Coadd\n 5407 | 2024-02-18 03:29:58 | MASTER-SAAO | (10h 41m 26.99s , +01d 33m 27.6s) | P\\\\ | 60 | 15.2 |\n 5407 | 2024-02-18 03:29:58 | MASTER-SAAO | (10h 49m 54.77s , +01d 21m 37.0s) | P/ | 60 | 15.6 |\n 5486 | 2024-02-18 03:31:17 | MASTER-SAAO | (10h 41m 27.30s , +01d 33m 30.9s) | P\\\\ | 60 | 15.2 |\n 5565 | 2024-02-18 03:32:36 | MASTER-SAAO | (10h 41m 27.64s , +01d 33m 34.0s) | P\\\\ | 60 | 14.9 |\n 5644 | 2024-02-18 03:33:56 | MASTER-SAAO | (10h 41m 28.01s , +01d 33m 36.9s) | P\\\\ | 60 | 14.7 |\n 37731 | 2024-02-18 12:29:04 | MASTER-Tunka | (10h 47m 38.33s , +01d 18m 35.3s) | C | 15 | 14.5 |\n 38096 | 2024-02-18 12:35:12 | MASTER-Tunka | (10h 47m 37.18s , +01d 19m 14.4s) | C | 10 | 15.1 |\n 38216 | 2024-02-18 12:37:13 | MASTER-Tunka | (10h 47m 40.38s , +01d 19m 19.4s) | C | 10 | 15.5 |\n 38710 | 2024-02-18 12:45:24 | MASTER-Tunka | (10h 47m 36.30s , +01d 18m 28.0s) | C | 15 | 16.3 |\n 38995 | 2024-02-18 12:49:46 | MASTER-Tunka | (10h 38m 48.85s , +10d 44m 59.8s) | C | 60 | 17.3 | Coadd\n 39507 | 2024-02-18 12:58:18 | MASTER-Tunka | (10h 35m 15.86s , +08d 51m 16.2s) | C | 60 | 17.2 | Coadd\n 39944 | 2024-02-18 13:05:35 | MASTER-Tunka | (10h 47m 42.04s , +01d 18m 36.8s) | C | 60 | 16.5 | Coadd\n 40056 | 2024-02-18 13:07:27 | MASTER-Tunka | (10h 47m 41.29s , +01d 20m 03.4s) | C | 60 | 16.6 | Coadd\n 40156 | 2024-02-18 13:09:07 | MASTER-Tunka | (10h 47m 38.71s , +01d 20m 49.0s) | C | 60 | 16.3 | Coadd\n 40250 | 2024-02-18 13:10:41 | MASTER-Tunka | (10h 54m 53.00s , +06d 55m 56.6s) | C | 60 | 16.5 | Coadd\n 40343 | 2024-02-18 13:12:15 | MASTER-Tunka | (10h 52m 38.26s , +05d 03m 24.3s) | C | 60 | 16.9 | Coadd\n 40439 | 2024-02-18 13:13:50 | MASTER-Tunka | (10h 39m 35.82s , +06d 57m 09.6s) | C | 60 | 16.9 | Coadd\n 40624 | 2024-02-18 13:16:55 | MASTER-Tunka | (10h 37m 18.95s , +05d 04m 17.4s) | C | 60 | 16.6 | Coadd\n 40702 | 2024-02-18 13:18:14 | MASTER-Tunka | (10h 45m 21.06s , +05d 02m 35.5s) | C | 60 | 16.6 | Coadd\n 40787 | 2024-02-18 13:19:38 | MASTER-Tunka | (10h 42m 26.14s , +08d 51m 18.9s) | C | 60 | 17.0 | Coadd\n 40869 | 2024-02-18 13:21:01 | MASTER-Tunka | (10h 50m 32.88s , +08d 52m 05.4s) | C | 60 | 16.9 | Coadd\n 40952 | 2024-02-18 13:22:24 | MASTER-Tunka | (10h 57m 49.23s , +08d 49m 53.1s) | C | 60 | 16.8 | Coadd\n 41168 | 2024-02-18 13:25:59 | MASTER-Tunka | (11h 06m 01.14s , +08d 51m 12.8s) | C | 60 | 16.8 | Coadd\n 41286 | 2024-02-18 13:27:57 | MASTER-Tunka | (10h 54m 48.26s , +06d 56m 16.0s) | C | 60 | 17.1 | Coadd\n 41368 | 2024-02-18 13:29:19 | MASTER-Tunka | (11h 02m 57.84s , +06d 56m 28.3s) | C | 60 | 17.0 | Coadd\n 41456 | 2024-02-18 13:30:47 | MASTER-Tunka | (10h 52m 34.50s , +05d 04m 06.5s) | C | 60 | 17.3 | Coadd\n 41539 | 2024-02-18 13:32:10 | MASTER-Tunka | (11h 00m 36.51s , +05d 02m 29.9s) | C | 60 | 17.3 | Coadd\n 41626 | 2024-02-18 13:33:37 | MASTER-Tunka | (10h 39m 36.37s , +06d 59m 06.5s) | C | 60 | 17.2 | Coadd\n 41711 | 2024-02-18 13:35:02 | MASTER-Tunka | (10h 47m 32.98s , +06d 57m 53.6s) | C | 60 | 17.3 | Coadd\n 41795 | 2024-02-18 13:36:26 | MASTER-Tunka | (10h 37m 15.72s , +05d 05m 21.7s) | C | 60 | 17.1 | Coadd\n 41962 | 2024-02-18 13:39:13 | MASTER-Tunka | (10h 42m 27.24s , +08d 51m 17.0s) | C | 60 | 17.1 | Coadd\n 42045 | 2024-02-18 13:40:36 | MASTER-Tunka | (10h 50m 38.75s , +08d 51m 29.5s) | C | 60 | 16.8 | Coadd\n 42128 | 2024-02-18 13:41:59 | MASTER-Tunka | (10h 57m 52.65s , +08d 52m 25.6s) | C | 60 | 16.9 | Coadd\n 42202 | 2024-02-18 13:43:14 | MASTER-Tunka | (11h 05m 58.34s , +08d 50m 44.7s) | C | 60 | 16.8 | Coadd\n 42283 | 2024-02-18 13:44:34 | MASTER-Tunka | (10h 47m 37.23s , +01d 23m 21.6s) | C | 60 | 16.9 | Coadd\n 42364 | 2024-02-18 13:45:55 | MASTER-Tunka | (10h 54m 47.76s , +06d 58m 11.6s) | C | 60 | 17.1 | Coadd\n 42458 | 2024-02-18 13:47:51 | MASTER-Tunka | (10h 47m 37.98s , +01d 22m 50.6s) | C | 15 | 17.2 |\n 42564 | 2024-02-18 13:49:16 | MASTER-Tunka | (10h 52m 32.50s , +05d 03m 26.2s) | C | 60 | 17.1 | Coadd\n 42647 | 2024-02-18 13:50:38 | MASTER-Tunka | (11h 00m 38.89s , +05d 03m 13.4s) | C | 60 | 17.3 | Coadd\n 42734 | 2024-02-18 13:52:05 | MASTER-Tunka | (10h 39m 33.09s , +06d 59m 44.7s) | C | 60 | 17.2 | Coadd\n 42901 | 2024-02-18 13:54:52 | MASTER-Tunka | (10h 37m 22.06s , +05d 06m 16.7s) | C | 60 | 17.4 | Coadd\n 42976 | 2024-02-18 13:56:07 | MASTER-Tunka | (10h 45m 18.62s , +05d 05m 05.1s) | C | 60 | 17.5 | Coadd\n 43056 | 2024-02-18 13:57:27 | MASTER-Tunka | (10h 42m 26.11s , +08d 54m 13.1s) | C | 60 | 17.7 | Coadd\n 43136 | 2024-02-18 13:58:47 | MASTER-Tunka | (10h 50m 38.49s , +08d 52m 59.4s) | C | 60 | 17.4 | Coadd\n 43215 | 2024-02-18 14:00:06 | MASTER-Tunka | (10h 57m 49.10s , +08d 51m 46.8s) | C | 60 | 17.7 | Coadd\n 43228 | 2024-02-18 14:00:39 | MASTER-Tunka | (10h 47m 40.22s , +01d 20m 59.8s) | C | 20 | 18.0 |\n 43267 | 2024-02-18 14:01:18 | MASTER-Tunka | (10h 47m 37.73s , +01d 22m 59.7s) | C | 20 | 18.2 |\n 43299 | 2024-02-18 14:01:51 | MASTER-Tunka | (10h 47m 37.71s , +01d 21m 11.4s) | C | 20 | 18.1 |\n 43401 | 2024-02-18 14:03:13 | MASTER-Tunka | (11h 06m 01.33s , +08d 53m 22.5s) | C | 60 | 17.5 | Coadd\n 43417 | 2024-02-18 14:03:48 | MASTER-Tunka | (10h 47m 34.17s , +01d 22m 08.1s) | C | 20 | 18.0 |\n 43518 | 2024-02-18 14:05:09 | MASTER-Tunka | (10h 51m 03.90s , +03d 11m 21.3s) | C | 60 | 17.6 | Coadd\n 43530 | 2024-02-18 14:05:42 | MASTER-Tunka | (10h 47m 34.57s , +01d 21m 12.9s) | C | 20 | 18.0 |\n 43550 | 2024-02-18 14:05:42 | MASTER-Tunka | (10h 47m 34.56s , +01d 21m 12.8s) | C | 60 | 18.7 | Coadd\n 43630 | 2024-02-18 14:07:02 | MASTER-Tunka | (10h 59m 05.19s , +03d 10m 32.9s) | C | 60 | 17.8 | Coadd\n 43644 | 2024-02-18 14:07:35 | MASTER-Tunka | (10h 47m 37.76s , +01d 23m 18.4s) | C | 20 | 17.8 |\n 43674 | 2024-02-18 14:08:05 | MASTER-Tunka | (10h 47m 34.41s , +01d 23m 20.3s) | C | 20 | 17.9 |\n 43704 | 2024-02-18 14:08:35 | MASTER-Tunka | (10h 47m 41.66s , +01d 23m 15.8s) | C | 20 | 17.9 |\n 43724 | 2024-02-18 14:08:35 | MASTER-Tunka | (10h 47m 41.66s , +01d 23m 15.7s) | C | 60 | 18.8 | Coadd\n 43807 | 2024-02-18 14:09:58 | MASTER-Tunka | (10h 46m 08.59s , +10d 48m 41.2s) | C | 60 | 17.7 | Coadd\n 43824 | 2024-02-18 14:10:35 | MASTER-Tunka | (10h 47m 41.97s , +01d 22m 33.2s) | C | 20 | 18.1 |\n 43853 | 2024-02-18 14:11:05 | MASTER-Tunka | (10h 47m 34.36s , +01d 21m 35.6s) | C | 20 | 18.2 |\n 43882 | 2024-02-18 14:11:34 | MASTER-Tunka | (10h 47m 40.80s , +01d 21m 56.6s) | C | 20 | 18.1 |\n 43983 | 2024-02-18 14:12:55 | MASTER-Tunka | (10h 54m 20.01s , +10d 48m 30.6s) | C | 60 | 17.7 | Coadd\n 43997 | 2024-02-18 14:13:29 | MASTER-Tunka | (10h 47m 38.29s , +01d 21m 56.4s) | C | 20 | 18.1 |\n 44097 | 2024-02-18 14:14:48 | MASTER-Tunka | (10h 35m 44.62s , +03d 12m 26.8s) | C | 60 | 17.6 | Coadd\n 44108 | 2024-02-18 14:15:20 | MASTER-Tunka | (10h 47m 35.70s , +01d 23m 49.7s) | C | 20 | 18.3 |\n 44208 | 2024-02-18 14:16:39 | MASTER-Tunka | (10h 43m 51.68s , +03d 12m 14.6s) | C | 60 | 17.7 | Coadd\n 44219 | 2024-02-18 14:17:10 | MASTER-Tunka | (10h 47m 35.66s , +01d 21m 55.0s) | C | 20 | 18.1 |\n 44321 | 2024-02-18 14:18:33 | MASTER-Tunka | (11h 01m 39.55s , +10d 48m 20.3s) | C | 60 | 17.8 | Coadd\n 44335 | 2024-02-18 14:19:06 | MASTER-Tunka | (10h 47m 38.10s , +01d 22m 01.8s) | C | 20 | 18.3 |\n 44538 | 2024-02-18 14:22:29 | MASTER-Tunka | (10h 47m 34.88s , +01d 24m 07.9s) | C | 20 | 18.4 |\n 44638 | 2024-02-18 14:23:49 | MASTER-Tunka | (10h 59m 04.16s , +03d 12m 01.4s) | C | 60 | 18.0 | Coadd\n 44719 | 2024-02-18 14:25:10 | MASTER-Tunka | (10h 46m 07.62s , +10d 47m 27.7s) | C | 60 | 17.9 | Coadd\n 44801 | 2024-02-18 14:26:32 | MASTER-Tunka | (11h 07m 49.79s , +05d 06m 35.5s) | C | 60 | 17.9 | Coadd\n 44939 | 2024-02-18 14:29:10 | MASTER-Tunka | (10h 47m 36.97s , +01d 25m 32.5s) | C | 20 | 18.2 |\n 45041 | 2024-02-18 14:30:33 | MASTER-Tunka | (10h 54m 18.03s , +10d 48m 24.4s) | C | 60 | 17.9 | Coadd\n 45123 | 2024-02-18 14:31:54 | MASTER-Tunka | (10h 35m 43.99s , +03d 14m 19.2s) | C | 60 | 17.6 | Coadd\n 45138 | 2024-02-18 14:32:27 | MASTER-Tunka | (10h 47m 41.18s , +01d 23m 41.2s) | C | 26 | 18.6 |\n 45241 | 2024-02-18 14:33:53 | MASTER-Tunka | (10h 43m 44.90s , +03d 12m 07.2s) | C | 60 | 17.8 | Coadd\n 45308 | 2024-02-18 14:35:00 | MASTER-Tunka | (11h 01m 41.55s , +10d 47m 25.6s) | C | 60 | 18.2 | Coadd\n 45461 | 2024-02-18 14:37:33 | MASTER-Tunka | (10h 51m 01.14s , +03d 12m 08.8s) | C | 60 | 18.2 | Coadd\n 45615 | 2024-02-18 14:40:06 | MASTER-Tunka | (10h 46m 07.79s , +10d 49m 11.4s) | C | 60 | 18.2 | Coadd\n 45694 | 2024-02-18 14:41:25 | MASTER-Tunka | (11h 07m 47.37s , +05d 07m 30.9s) | C | 60 | 18.3 | Coadd\n 45793 | 2024-02-18 14:43:21 | MASTER-Tunka | (10h 47m 40.67s , +01d 23m 13.5s) | C | 26 | 18.6 |\n 45882 | 2024-02-18 14:44:33 | MASTER-Tunka | (10h 58m 10.94s , +01d 19m 44.4s) | C | 60 | 18.0 | Coadd\n 46035 | 2024-02-18 14:47:07 | MASTER-Tunka | (10h 54m 22.19s , +10d 50m 10.7s) | C | 60 | 18.0 | Coadd\n 46115 | 2024-02-18 14:48:26 | MASTER-Tunka | (10h 35m 44.19s , +03d 14m 09.0s) | C | 60 | 18.0 | Coadd\n 46191 | 2024-02-18 14:49:42 | MASTER-Tunka | (10h 43m 45.11s , +03d 14m 55.2s) | C | 60 | 17.9 | Coadd\n 46215 | 2024-02-18 14:50:23 | MASTER-Tunka | (10h 47m 36.32s , +01d 26m 05.3s) | C | 26 | 18.5 |\n 46306 | 2024-02-18 14:51:37 | MASTER-Tunka | (11h 01m 36.42s , +10d 48m 08.6s) | C | 60 | 17.9 | Coadd\n 46409 | 2024-02-18 14:53:37 | MASTER-Tunka | (10h 47m 37.82s , +01d 25m 14.8s) | C | 26 | 18.3 |\n 46727 | 2024-02-18 14:58:38 | MASTER-Tunka | (10h 50m 14.70s , +01d 20m 08.7s) | C | 60 | 17.9 | Coadd\n 46802 | 2024-02-18 14:59:54 | MASTER-Tunka | (10h 58m 06.89s , +01d 18m 53.8s) | C | 60 | 17.7 | Coadd\n 46960 | 2024-02-18 15:02:31 | MASTER-Tunka | (11h 06m 14.03s , +03d 13m 07.3s) | C | 60 | 18.2 | Coadd\n 47229 | 2024-02-18 15:07:01 | MASTER-Tunka | (10h 32m 13.67s , +07d 02m 08.0s) | C | 60 | 18.1 | Coadd\n 47382 | 2024-02-18 15:09:33 | MASTER-Tunka | (10h 42m 58.69s , +01d 20m 00.6s) | C | 60 | 17.9 | Coadd\n 47459 | 2024-02-18 15:10:50 | MASTER-Tunka | (11h 10m 12.18s , +07d 02m 22.6s) | C | 60 | 18.4 | Coadd\n 47487 | 2024-02-18 15:11:33 | MASTER-Tunka | (10h 47m 30.27s , +01d 27m 10.1s) | C | 30 | 18.7 |\n 47610 | 2024-02-18 15:13:36 | MASTER-Tunka | (10h 47m 41.08s , +01d 25m 46.8s) | C | 30 | 18.8 |\n 47703 | 2024-02-18 15:14:54 | MASTER-Tunka | (10h 50m 08.60s , +01d 19m 60.0s) | C | 60 | 18.2 | Coadd\n 47778 | 2024-02-18 15:16:09 | MASTER-Tunka | (10h 58m 13.88s , +01d 19m 45.5s) | C | 60 | 18.1 | Coadd\n 47932 | 2024-02-18 15:18:43 | MASTER-Tunka | (10h 30m 07.73s , +05d 10m 30.8s) | C | 60 | 18.4 | Coadd\n 48009 | 2024-02-18 15:20:00 | MASTER-Tunka | (11h 06m 11.54s , +03d 14m 34.6s) | C | 60 | 18.2 | Coadd\n 48238 | 2024-02-18 15:23:49 | MASTER-Tunka | (10h 32m 13.16s , +07d 03m 00.9s) | C | 60 | 18.1 | Coadd\n 48265 | 2024-02-18 15:24:31 | MASTER-Tunka | (10h 47m 40.23s , +01d 25m 42.7s) | C | 30 | 18.8 |\n 48509 | 2024-02-18 15:28:20 | MASTER-Tunka | (11h 10m 12.52s , +07d 03m 42.2s) | C | 60 | 18.4 | Coadd\n 48662 | 2024-02-18 15:30:53 | MASTER-Tunka | (11h 13m 17.70s , +08d 56m 44.0s) | C | 60 | 18.4 | Coadd\n 48690 | 2024-02-18 15:31:36 | MASTER-Tunka | (10h 47m 29.76s , +01d 27m 14.6s) | C | 30 | 19.0 |\n 48813 | 2024-02-18 15:33:39 | MASTER-Tunka | (10h 47m 37.67s , +01d 27m 38.4s) | C | 30 | 19.0 |\n 48980 | 2024-02-18 15:36:11 | MASTER-Tunka | (10h 30m 08.14s , +05d 11m 26.6s) | C | 60 | 18.3 | Coadd\n 49057 | 2024-02-18 15:37:28 | MASTER-Tunka | (11h 06m 10.68s , +03d 15m 29.4s) | C | 60 | 18.4 | Coadd\n 49315 | 2024-02-18 15:41:47 | MASTER-Amur | (10h 57m 19.34s , +06d 42m 16.7s) | C | 60 | 15.3 |\n 49398 | 2024-02-18 15:43:09 | MASTER-Amur | (11h 05m 16.16s , +06d 41m 37.4s) | C | 60 | 15.6 |\n 49463 | 2024-02-18 15:44:14 | MASTER-Tunka | (10h 42m 58.47s , +01d 23m 47.6s) | C | 60 | 18.2 | Coadd\n 49478 | 2024-02-18 15:44:29 | MASTER-Amur | (10h 55m 08.09s , +04d 48m 25.4s) | C | 60 | 16.2 |\n 49492 | 2024-02-18 15:44:58 | MASTER-Tunka | (10h 47m 36.78s , +01d 26m 27.4s) | C | 30 | 19.0 |\n 49557 | 2024-02-18 15:45:49 | MASTER-Amur | (11h 03m 10.16s , +04d 47m 23.1s) | C | 60 | 16.2 |\n 49584 | 2024-02-18 15:46:16 | MASTER-Tunka | (11h 13m 19.03s , +08d 58m 06.2s) | C | 60 | 18.4 | Coadd\n 49638 | 2024-02-18 15:47:10 | MASTER-Amur | (10h 41m 53.94s , +06d 40m 38.4s) | C | 60 | 15.9 |\n 49720 | 2024-02-18 15:48:31 | MASTER-Amur | (10h 49m 57.92s , +06d 42m 02.7s) | C | 60 | 16.0 |\n 49799 | 2024-02-18 15:49:50 | MASTER-Amur | (10h 44m 39.89s , +08d 33m 31.4s) | C | 60 | 16.6 |\n 49879 | 2024-02-18 15:51:10 | MASTER-Amur | (10h 52m 51.81s , +08d 34m 07.9s) | C | 60 | 17.0 |\n 49926 | 2024-02-18 15:52:12 | MASTER-Tunka | (10h 47m 33.46s , +01d 29m 53.8s) | C | 30 | 19.0 |\n 49958 | 2024-02-18 15:52:29 | MASTER-Amur | (10h 39m 53.13s , +04d 45m 32.2s) | C | 60 | 17.4 |\n 50022 | 2024-02-18 15:53:34 | MASTER-Tunka | (10h 30m 04.25s , +05d 10m 48.5s) | C | 60 | 18.3 | Coadd\n 50038 | 2024-02-18 15:53:49 | MASTER-Amur | (10h 47m 57.13s , +04d 47m 12.3s) | C | 60 | 17.7 |\n 50049 | 2024-02-18 15:54:16 | MASTER-Tunka | (10h 47m 40.29s , +01d 28m 29.1s) | C | 30 | 19.0 |\n 50122 | 2024-02-18 15:55:13 | MASTER-Amur | (11h 00m 03.71s , +08d 36m 06.4s) | C | 60 | 17.1 |\n 50201 | 2024-02-18 15:56:32 | MASTER-Amur | (11h 08m 13.72s , +08d 35m 33.7s) | C | 60 | 17.4 |\n 50329 | 2024-02-18 15:58:40 | MASTER-Amur | (10h 57m 12.00s , +06d 39m 47.6s) | C | 60 | 17.6 |\n 50408 | 2024-02-18 16:00:00 | MASTER-Amur | (11h 05m 21.82s , +06d 40m 38.9s) | C | 60 | 17.5 |\n 50720 | 2024-02-18 16:05:11 | MASTER-Amur | (10h 55m 09.03s , +04d 45m 58.8s) | C | 60 | 17.1 |\n 50724 | 2024-02-18 16:05:27 | MASTER-Tunka | (10h 47m 32.55s , +01d 27m 23.0s) | C | 36 | 18.8 |\n 50800 | 2024-02-18 16:06:31 | MASTER-Amur | (11h 03m 14.63s , +04d 47m 52.5s) | C | 60 | 17.6 |\n 51166 | 2024-02-18 16:12:49 | MASTER-Tunka | (10h 47m 35.36s , +01d 30m 19.8s) | C | 36 | 18.9 |\n 51297 | 2024-02-18 16:15:01 | MASTER-Tunka | (10h 47m 39.96s , +01d 28m 24.2s) | C | 36 | 19.0 |\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/35750.",
"published": "2024-02-18T16:33:09.144548Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-18T16:33:09.144601Z",
"modified": "2024-02-18T16:33:09.157070Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6052,
"topic": "gcn.circular",
"uuid": "3145853a-561c-4150-b8b6-c57029f7e74d",
"title": "GRB 240220A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "24/02/20 11:25:52 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35759"
},
"title": "GCN CIRCULAR",
"number": "35759",
"subject": "GRB 240220A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 11:15:23 UT on 20 Feb 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240220A (trigger 730120528.966366 / 240220469).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 55.2, Dec = 26.4 (J2000 degrees, equivalent to J2000 03h 40m, 26d 23'), with a statistical uncertainty of 2.2 degrees.\n\nThe angle from the Fermi LAT boresight is 77.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240220469/quicklook/glg_skymap_all_bn240220469.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240220469/quicklook/glg_healpix_all_bn240220469.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240220469/quicklook/glg_lc_medres34_bn240220469.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35759.",
"published": "2024-02-20T11:26:13.479499Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-20T11:26:13.479579Z",
"modified": "2024-02-20T11:26:13.509351Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6053,
"topic": "gcn.circular",
"uuid": "3cf91327-8449-4806-8e0e-18177bbe5828",
"title": "Fermi GRB 240220A: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "24/02/20 11:30:34 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35760"
},
"title": "GCN CIRCULAR",
"number": "35760",
"subject": "Fermi GRB 240220A: 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-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the Fermi GRB 240220A ( Fermi GBM team, GCN 35759) errorbox 308 sec after notice time and 342 sec after trigger time at 2024-02-20 11:21:06 UT, with upper limit up to 17.5 mag. The observations began at zenith distance = 37 deg. The sun altitude is -24.0 deg.\n\nThe galactic latitude b = -22 deg., longitude l = 164 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#82619\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 372 | 2024-02-20 11:21:06 | MASTER-Amur | (03h 32m 28.27s , +23d 57m 23.1s) | C | 60 | 17.4 |\n 452 | 2024-02-20 11:22:25 | MASTER-Amur | (03h 41m 17.33s , +23d 56m 30.1s) | C | 60 | 17.5 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35760.",
"published": "2024-02-20T11:30:42.421962Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-20T11:30:42.422047Z",
"modified": "2024-02-20T11:30:42.437502Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6044,
"topic": "gcn.circular",
"uuid": "58cb4956-8994-4e57-98cd-4c7c88d7f837",
"title": "IPN triangulation of GRB 240209A",
"submitter": "Hop gcn.circular",
"authors": "Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>",
"data": {
"date": "24/02/18 17:22:41 GMT",
"from": "Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35751"
},
"title": "GCN CIRCULAR",
"number": "35751",
"subject": "IPN triangulation of GRB 240209A"
},
"message_text": "D. Svinkin, D. Frederiks, A. Lysenko, A. Ridnaia,\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\nand\n\nS. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu\non behalf of the Swift-BAT team,\n\nreport:\n\nThe long-duration GRB 240209A\n(Fermi-GBM detection: The Fermi GBM team, GCN 35712;\nMalacaria et al., GCN 35729)\nwas detected by Fermi (GBM trigger 729152364) and\nKonus-Wind, in the waiting mode, at about 22760 s UT (06:19:20).\n\nWe have triangulated it to a Konus-GBM annulus centered at\nRA(2000)\u00119.672 deg (07h 58m 41s) Dec(2000)=+19.090 deg (+19d 05' 25\"),\nwhose radius is 66.074 +/- 14.729 deg (3 sigma).\n\nThe annulus combined with the Fermi-GBM final position (GCN 35712;\nglg_healpix_all_bn240209263_v01) gives ~2019 sq. deg (3 sigma) localization region.\n\nThe reported optical counterpart candidate GOTO24pw/AT2024cew\n(Belkin et al., GCN 35715) is outside the Konus-GBM annulus,\nimplying that the optical transient is unrelated to the GRB.\n\nA triangulation map and HEALPix FITS file are posted at\nhttp://www.ioffe.ru/LEA/GRBs/GRB240209_T22759/IPN\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35751.",
"published": "2024-02-18T17:22:56.355742Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-18T17:22:56.355797Z",
"modified": "2024-02-18T17:22:56.366285Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6045,
"topic": "gcn.circular",
"uuid": "4f6ac9d5-10a1-43e9-9319-0a6ac2050d4a",
"title": "GRB 240215B: GRBAlpha detection",
"submitter": "Hop gcn.circular",
"authors": "Andras Pal at Konkoly Observatory <apal@szofi.net>",
"data": {
"date": "24/02/18 21:35:25 GMT",
"from": "Andras Pal at Konkoly Observatory <apal@szofi.net>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35752"
},
"title": "GCN CIRCULAR",
"number": "35752",
"subject": "GRB 240215B: GRBAlpha detection"
},
"message_text": "A. Pal (Konkoly Observatory), M. Dafcikova, J. Ripa, M. Kolar, N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, 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 240215B (Swift/BAT detection: GCN 35739; Fermi/GBM detection: GCN 35740; INTEGRAL/SPI-ACS peak detection at 2024-02-15 ~19:51:47) 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 2024-02-15 19:51:49 UTC. The T90 duration measured by GRBAlpha is 16.5 s and the overall significance during T90 reaches 23 sigma.\n\nThe light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB240215B_GCN.pdf\n\nAll GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/hea/GRBAlpha/ GRBAlpha, 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/35752.",
"published": "2024-02-18T21:35:42.298746Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-18T21:35:42.298784Z",
"modified": "2024-02-18T21:35:42.313669Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6046,
"topic": "gcn.circular",
"uuid": "abcd373e-7a4d-4b55-bedc-8863ded8f679",
"title": "GRB 240216A: GRBAlpha detection",
"submitter": "Hop gcn.circular",
"authors": "Andras Pal at Konkoly Observatory <apal@szofi.net>",
"data": {
"date": "24/02/18 21:45:38 GMT",
"from": "Andras Pal at Konkoly Observatory <apal@szofi.net>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35753"
},
"title": "GCN CIRCULAR",
"number": "35753",
"subject": "GRB 240216A: GRBAlpha detection"
},
"message_text": "A. Pal (Konkoly Observatory), M. Dafcikova, J. Ripa, M. Kolar, N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, 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 240216A (Fermi/GBM detection: GCN 35736; Konus/Wind trigger detection at 2024-02-16 10:57:01.022 UT; INTEGRAL/SPI-ACS peak detection at 2024-02-16 ~10:57:04 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 2024-02-16 10:57:03 UTC. The T90 duration measured by GRBAlpha is 1.0 s and the overall significance during T90 reaches 8.8 sigma.\n\nThe light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB240216A_GCN.pdf\n\nAll GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/hea/GRBAlpha/ GRBAlpha, 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\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35753.",
"published": "2024-02-18T21:45:49.060965Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-18T21:45:49.061099Z",
"modified": "2024-02-18T21:45:49.068534Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6606,
"topic": "gcn.circular",
"uuid": "59168230-1a58-4184-9168-63969b00991a",
"title": "EP 240414a: BOOTES-4/MET Optical Upper Limits",
"submitter": "Hop gcn.circular",
"authors": "Dingrong Xiong at Yunnan Observatories of CAS, China <xiongdingrong@ynao.ac.cn>",
"data": {
"date": "24/04/16 06:23:58 GMT",
"from": "Dingrong Xiong at Yunnan Observatories of CAS, China <xiongdingrong@ynao.ac.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36130"
},
"title": "GCN CIRCULAR",
"number": "36130",
"subject": "EP 240414a: BOOTES-4/MET Optical Upper Limits"
},
"message_text": "D. R. Xiong, J. M. Bai, J. R. Mao, Y. F. Fan, K. Ye, C. J. Wang, Y. X. Xin, B. L. Lun, J. J. Zhang, X. H. Zhao, L. Xu, K. X. Lu, X. Ding, D. Q. Wang (Yunnan Observatories), A. J. Castro-Tirado, E. Fernandez-Garcia, Y. D. Hu (IAA-CSIC) and C. J. Perez del Pulgar (UMA) on behalf of the BOOTES team report:\n\nWe observed the X-ray transient with R.A. = 191.498 deg, DEC = -9.695 deg, and did not found any optical counterpart within an uncertainty of 3 arcmin in radius compared to the PanSTARRS DR1 image. The upper limits of magnitudes (without being corrected for Galactic extinction) are given as follows.\n\nTmid-T0 (day) | UT (start) | Upper Limit (error) | Exposure Time | Filter\n\n--------------------------------------------------------------------------------------------------------------\n\n0.23 | 24-04-14 15:24:00 | 17.446 (0.06) | 60*20s | Clear\n\n-------------------------------------------------------------------------------------------------------------\n\nThe Burst Optical Observer and Transient Exploring System (BOOTES, bootes.iaa.es) is a completed world-wide network of robotic telescopes led at IAA-CSIC (Spain) which aims at following-up transients and other astrophysical sources in the sky for which the first station was installed in 1998 (Castro-Tirado et al. 1999). The fourth station of the BOOTES Network, BOOTES-4/MET, is located at the Lijiang Observatory of the Yunnan Observatories of China (Xiong et al. 2020). See also Hu et al. (2021). We acknowledge the support of BOOTES-4 technical staffs.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36130.",
"published": "2024-04-16T06:24:14.051069Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-16T06:24:14.051084Z",
"modified": "2024-04-16T06:24:14.063913Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6060,
"topic": "gcn.circular",
"uuid": "420d11f8-32fa-4c55-9c4b-ba1bd8a89413",
"title": "Swift-BAT triggers 1216743-1216748 are not astrophysical",
"submitter": "Hop gcn.circular",
"authors": "Simone Dichiara at Pennsylvania State University <sbd5667@psu.edu>",
"data": {
"date": "24/02/21 22:58:24 GMT",
"from": "Simone Dichiara at Pennsylvania State University <sbd5667@psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35767"
},
"title": "GCN CIRCULAR",
"number": "35767",
"subject": "Swift-BAT triggers 1216743-1216748 are not astrophysical"
},
"message_text": "S. Dichiara (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:\n\nSwift triggers 1216743, 1216745, 1216746, 1216747 and 1216748 were caused by a star track loss-of-lock event, and are not interesting astrophysical events.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35767.",
"published": "2024-02-21T22:58:31.645693Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-21T22:58:31.645733Z",
"modified": "2024-02-21T22:58:31.652220Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6061,
"topic": "gcn.circular",
"uuid": "d7a23955-aa90-4b7a-9504-980b96c28761",
"title": "Swift-BAT triggers 1216751 and 1216753 are not astrophysical events",
"submitter": "Hop gcn.circular",
"authors": "Simone Dichiara at Pennsylvania State University <sbd5667@psu.edu>",
"data": {
"date": "24/02/22 01:12:13 GMT",
"from": "Simone Dichiara at Pennsylvania State University <sbd5667@psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35768"
},
"title": "GCN CIRCULAR",
"number": "35768",
"subject": "Swift-BAT triggers 1216751 and 1216753 are not astrophysical events"
},
"message_text": "S. Dichiara (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:\n\nSwift-BAT triggers 1216751 and 1216753 are also related to the ongoing star tracker loss-of-lock event, and and they not of astrophysical interest.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35768.",
"published": "2024-02-22T01:12:31.379155Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-22T01:12:31.379197Z",
"modified": "2024-02-22T01:12:31.394161Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6062,
"topic": "gcn.circular",
"uuid": "4348335d-23a3-41cf-8234-3a52df5410ab",
"title": "GRB 240222A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "24/02/22 09:02:21 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35769"
},
"title": "GCN CIRCULAR",
"number": "35769",
"subject": "GRB 240222A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 08:51:31 UT on 22 Feb 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240222A (trigger 730284696.466782 / 240222369).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 143.3, Dec = -60.4 (J2000 degrees, equivalent to J2000 09h 33m, -60d 23'), with a statistical uncertainty of 9.1 degrees.\n\nThe angle from the Fermi LAT boresight is 109.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240222369/quicklook/glg_skymap_all_bn240222369.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240222369/quicklook/glg_healpix_all_bn240222369.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240222369/quicklook/glg_lc_medres34_bn240222369.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35769.",
"published": "2024-02-22T09:02:38.921027Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-22T09:02:38.921103Z",
"modified": "2024-02-22T09:02:38.929491Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6047,
"topic": "gcn.circular",
"uuid": "9bb1a998-bf61-440f-beac-30fbae0fa030",
"title": "GRB 240215A: Fermi GBM Observation",
"submitter": "Hop gcn.circular",
"authors": "Lorenzo Scotton at UAH <lscottongcn@outlook.com>",
"data": {
"date": "24/02/18 23:32:17 GMT",
"from": "Lorenzo Scotton at UAH <lscottongcn@outlook.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35754"
},
"title": "GCN CIRCULAR",
"number": "35754",
"subject": "GRB 240215A: Fermi GBM Observation"
},
"message_text": "L. Scotton (UAH) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 15:33:00.41 UT on 15 February 2024, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 240215A (trigger 729703985/240215648),\nwhich was also detected by Swift/BAT-GUANO (J. DeLaunay et al. 2024, GCN 35733).\nThe Fermi GBM on-ground location is consistent with the Swift/BAT-GUANO position.\n\nThe angle from the Fermi LAT boresight is 67 degrees.\n\nThe GBM light curve consists of a pulse followed by weak emission with a duration (T90)\nof about 57 s (50-300 keV). The time-averaged spectrum\nfrom T0-4.1 to T0+60.4 s is best fit by\na simple power law function with index -1.77 +/- 0.06.\n\nThe event fluence (10-1000 keV) in this time interval is\n(3.6 +/- 0.3)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0-0.064 s in the 10-1000 keV band is 1.9 +/- 0.2 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog:\nhttps://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html\n\nFor Fermi GBM data and info, please visit the official Fermi GBM Support Page:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35754.",
"published": "2024-02-18T23:32:34.807121Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-18T23:32:34.807166Z",
"modified": "2024-02-18T23:32:34.815788Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6048,
"topic": "gcn.circular",
"uuid": "fd3d62ad-947d-4477-b348-835694add487",
"title": "GRB 240218A: Fermi GBM Detection",
"submitter": "Hop gcn.circular",
"authors": "Peter Veres at University of Alabama in Huntsville <veresp@gmail.com>",
"data": {
"date": "24/02/19 01:21:14 GMT",
"from": "Peter Veres at University of Alabama in Huntsville <veresp@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35755"
},
"title": "GCN CIRCULAR",
"number": "35755",
"subject": "GRB 240218A: Fermi GBM Detection"
},
"message_text": "P. Veres and C. Meegan (both UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 02:00:21.72 UT on 18 February 2024, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 240218A (trigger 729914426/240218084),\nwhich was also detected by Swift/BAT (Page et al. 2024, GCN 35742).\nThe Fermi GBM on-ground localization is consistent with the Swift BAT position.\n\n\nThe angle from the Fermi LAT boresight is 93 degrees.\n\nThe GBM light curve consists of a single pulse followed by weaker emission with a duration (T90)\nof about 38 s (50-300 keV). The time-averaged spectrum\nfrom T0-2.6 to T0+30.2 s is best fit by\na Band function with Epeak = 100 +/- 20 keV,\nalpha = -0.3 +/- 0.3, and beta = -1.9 +/- 0.1.\n\nThe event fluence (10-1000 keV) in this time interval is\n(5.2 +/- 0.4)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+1.5 s in the 10-1000 keV band is 3.1 +/- 0.2 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog:\nhttps://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html\n\nFor Fermi GBM data and info, please visit the official Fermi GBM Support Page:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35755.",
"published": "2024-02-19T01:21:30.436930Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-19T01:21:30.436958Z",
"modified": "2024-02-19T01:21:30.445461Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6063,
"topic": "gcn.circular",
"uuid": "59d5bf4b-4c48-49f3-9486-4efc8c59b1dc",
"title": "GRB 240222A: Swift detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "Paolo D'Avanzo at INAF - OAB <paolo.davanzo@inaf.it>",
"data": {
"date": "24/02/22 09:04:46 GMT",
"from": "Paolo D'Avanzo at INAF - OAB <paolo.davanzo@inaf.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35770"
},
"title": "GCN CIRCULAR",
"number": "35770",
"subject": "GRB 240222A: Swift detection of a burst"
},
"message_text": "\nP. D'Avanzo (INAF-OAB), R. Brivio (INAF-OAB), S. Dichiara (PSU),\nA. Y. Lien (U Tampa), K. L. Page (U Leicester),\nC. Salvaggio (INAF-OAB), T. Sbarrato (INAF-OAB) and\nB. Sbarufatti (INAF-OAB) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nAt 08:51:31 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 240222A (trigger\u001216804). Swift slewed immediately to the burst.\nThe BAT on-board calculated location is\nRA, Dec 143.248, -68.029 which is\n RA(J2000) = 09h 32m 59s\n Dec(J2000) = -68d 01' 43\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including\nsystematic uncertainty). The BAT light curve showed a multi-peaked\nstructure with a duration of about 20 sec. The peak count rate\nwas ~3000 counts/sec (15-350 keV), at ~0 sec after the trigger.\n\nThe XRT began observing the field at 08:53:05.3 UT, 94.0 seconds after\nthe BAT trigger. Using promptly downlinked data we find a fading,\nuncatalogued X-ray source located at RA, Dec 143.22556, -68.03102 which\nis equivalent to:\n RA(J2000) = 09h 32m 54.13s\n Dec(J2000) = -68d 01' 51.7\"\nwith an uncertainty of 3.5 arcseconds (radius, 90% containment). This\nlocation is 31 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 (1.72 x\n10^21 cm^-2, Willingale et al. 2013), with an excess column of 4.6\n(+3.44/-2.96) x 10^21 cm^-2 (90% confidence).\n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 98 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\n0.166.\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/35770.",
"published": "2024-02-22T09:04:57.618132Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-22T09:04:57.618175Z",
"modified": "2024-02-22T09:04:57.625355Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6064,
"topic": "gcn.circular",
"uuid": "fbb32c61-db6f-4a48-a674-f298bdbd47ff",
"title": "GRB 240222A: REM optical and NIR early-time observations",
"submitter": "Hop gcn.circular",
"authors": "Riccardo Brivio <riccardo.brivio@inaf.it>",
"data": {
"date": "24/02/22 14:35:20 GMT",
"from": "Riccardo Brivio <riccardo.brivio@inaf.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35771"
},
"title": "GCN CIRCULAR",
"number": "35771",
"subject": "GRB 240222A: REM optical and NIR early-time observations"
},
"message_text": "R. Brivio, Y.-D. Hu, P. DâAvanzo, M. Ferro, S. Covino, D. Fugazza (INAF-OAB) on behalf of the REM team, report:\n\nWe observed the field of GRB 240222A (D'Avanzo et al., GCN 35770) with the REM 60cm robotic telescope located at the ESO observatory of La Silla (Chile). The observations were carried in the g, r, i, z, H bands, starting on 2024 February 22 at 08:52:40 UT (i.e. 69 seconds after the burst), and lasting for about 2 hours.\n\nFrom a preliminary analysis, we find no source at the XRT position down to the following 3sigma magnitude upper limits:\n\nH > 16.7 (Vega; calibrated against the 2MASS catalogue)\nat a mid-time of t - t0 = 342 s after the GRB trigger,\n\nr > 18.7 (AB; calibrated against the APASS catalogue)\nat a mid-time of t - t0 = 485 s after the GRB trigger.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35771.",
"published": "2024-02-22T14:35:36.393766Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-22T14:35:36.393787Z",
"modified": "2024-02-22T14:35:36.403339Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6065,
"topic": "gcn.circular",
"uuid": "4b8afc56-c0cc-4212-ac5f-f641fea2f567",
"title": "Swift Trigger 1216864 is not an astrophysical event",
"submitter": "Hop gcn.circular",
"authors": "Simone Dichiara at Pennsylvania State University <sbd5667@psu.edu>",
"data": {
"date": "24/02/22 16:19:11 GMT",
"from": "Simone Dichiara at Pennsylvania State University <sbd5667@psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35772"
},
"title": "GCN CIRCULAR",
"number": "35772",
"subject": "Swift Trigger 1216864 is not an astrophysical event"
},
"message_text": "S. Dichiara (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:\n\nSwift-BAT trigger 1216864 is also related to the ongoing star tracker loss-of-lock event, and is not of astrophysical interest.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35772.",
"published": "2024-02-22T16:19:26.938479Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-22T16:19:26.938522Z",
"modified": "2024-02-22T16:19:26.946814Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6049,
"topic": "gcn.circular",
"uuid": "744bd148-340c-44e0-972a-bd75c1208122",
"title": "GRB 240218A: VLT/X-shooter redshift of z = 6.782",
"submitter": "Hop gcn.circular",
"authors": "Andrea Saccardi at Observatoire de Paris <andrea.saccardi@obspm.fr>",
"data": {
"date": "24/02/19 11:21:15 GMT",
"from": "Andrea Saccardi at Observatoire de Paris <andrea.saccardi@obspm.fr>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35756"
},
"title": "GCN CIRCULAR",
"number": "35756",
"subject": "GRB 240218A: VLT/X-shooter redshift of z = 6.782"
},
"message_text": "A. Saccardi (GEPI/Obs. de Paris), D. B. Malesani (DAWN/NBI & Radboud Univ.), J. T. Palmerio (GEPI/Obs. de Paris & IAP), S. D. Vergani (GEPI/Obs. de Paris & IAP & INAF/OABr), E. Le Flocâh (CEA), L. Izzo (INAF/OACn & DARK/NBI), A. J. Levan (Radboud Univ. & Warwick Univ.), J. P. U. Fynbo (DAWN/NBI), P. DâAvanzo (INAF/OABr), A. Rossi (INAF/OAS), A. de Ugarte Postigo (OCA), report on behalf of the Stargate collaboration:\n\nWe observed the field of the Swift and Fermi GRB 240218A (Page et al., GCN 35742; DâAvanzo et al., GCN 35747; Malesani et al., GCN 35749; Veres et al., GCN 35755) using the ESO/VLT UT3 (Melipal) equipped with the X-shooter spectrograph.\nOur spectra cover the wavelength range 3000-21000 AA, and consist of 4 exposures of 1200 s each. The observation starting-time was 2024 Feb 19.179 UT (~26 hr after the trigger). We detect a clear continuum across the whole NIR arm. From the detection of multiple absorption features, which we interpret as due to SiII, FeII, AlII, CrII, ZnII, MgI, SiII*, FeII*, CIV and SiIV, we infer a redshift of z = 6.782.\n\nWe note that this is the highest GRB redshift measured accurately from metal absorption lines in a good S/N spectrum.\nWe encourage follow-up at all wavelengths.\n\nWe acknowledge the excellent support from the ESO staff in Paranal, in particular Jonathan Smoker, Rodrigo Romero and Pascale Hibon.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35756.",
"published": "2024-02-19T11:21:31.303263Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-19T11:21:31.303329Z",
"modified": "2024-02-19T11:21:31.317202Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6050,
"topic": "gcn.circular",
"uuid": "54277a68-0a82-47e0-a75b-237970657bb8",
"title": "GRB 240218A: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/02/19 23:02:31 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35757"
},
"title": "GCN CIRCULAR",
"number": "35757",
"subject": "GRB 240218A: Swift-XRT refined Analysis"
},
"message_text": "K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), M. Ferro\n(INAF-OAB), R. Brivio (INAF-OAB), A. D'Ai (INAF-IASFPA), J. D. Gropp\n(PSU), S. Dichiara (PSU), J.A. Kennea (PSU) and P.A. Evans report on\nbehalf of the Swift-XRT team:\n\nWe have analysed 5.7 ks of XRT data for GRB 240218A, from 137 s to\n149.4 ks after the BAT trigger. The data comprise 118 s in Windowed\nTiming (WT) mode (the first 10 s were taken while Swift was slewing)\nwith the remainder in Photon Counting (PC) mode.\n\nThe light curve can be modelled with an initial power-law decay with an\nindex of alpha=2.12 (+0.11, -0.05), followed by a break at T+1538 s to\nan alpha of 0.70 (+0.06, -0.05).\n\nA spectrum formed from the WT mode data can be fitted with an absorbed\npower-law with a photon spectral index\tof 1.39 (+/-0.04). The\nbest-fitting absorption column is 1.39 (+0.29, -0.27) x 10^23 cm^-2,\nat a redshift of 6.782, in addition to the Galactic value of 4.2 x\n10^20 cm^-2 (Willingale et al. 2013). The counts to observed\n(unabsorbed) 0.3-10 keV flux conversion factor deduced from this\nspectrum is 4.8 x 10^-11 (5.3 x 10^-11) erg cm^-2 count^-1.\n\nA summary of the WT-mode spectrum is thus:\nGalactic foreground: 4.2 x 10^20 cm^-2\nIntrinsic column: 1.39 (+0.29, -0.27) x 10^23 cm^-2 at z=6.782\nPhoton index:\t 1.39 (+/-0.04)\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/01215912.\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/35757.",
"published": "2024-02-19T23:02:47.110248Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-19T23:02:47.110270Z",
"modified": "2024-02-19T23:02:47.120147Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6051,
"topic": "gcn.circular",
"uuid": "d7049e0c-6f1f-4367-ae43-2e0ddabae654",
"title": "Konus-Wind detection of GRB 240218A",
"submitter": "Hop gcn.circular",
"authors": "Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>",
"data": {
"date": "24/02/20 02:33:53 GMT",
"from": "Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35758"
},
"title": "GCN CIRCULAR",
"number": "35758",
"subject": "Konus-Wind detection of GRB 240218A"
},
"message_text": "D. Svinkin, D. Frederiks, A.Lysenko, A. Ridnaia,\nA. Tsvetkova, M. Ulanov, and T. Cline,\non behalf of the Konus-Wind team, report:\n\nThe long-duration GRB 240218A\n(Swift-BAT detection: Page et al., GCN 35742;\nFermi-GBM detection: Veres and Meegan, GCN 35755)\nwas detected by Konus-Wind (KW) in the waiting mode.\n\nA Bayesian block analysis of the KW waiting mode data\nin the 20-400 keV band reveals a >10 sigma count rate increase\nin the interval from T0-12.646 s to T0+25.626 s,\nwhere T0 = T0(BAT) = 02:00:00 UT.\nThe burst light curve shows a multi-peaked structure\nwith the brightest peak around ~T0(BAT)+20 s.\n\nThe Konus-Wind light curve of this GRB is available at\nhttp://www.ioffe.ru/LEA/GRBs/GRB240218_T07200/\n\nAs observed by Konus-Wind, the burst had\na total fluence of 7.62(-2.22,+1.72)x10^-6 erg/cm^2 and\na 2.944-s peak energy flux, measured from T0+19.738 s,\nof 5.29(-1.49,+2.21)x10^-7 erg/cm^2/s\n(both in the 20 keV - 10 MeV energy range).\n\nModelling the 3-channel time-integrated spectrum of the burst\n(measured from T0-12.646 s to T0+25.626 s)\nby a power law with exponential cutoff (CPL) model\ndN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)\nyields alpha > -0.56 and Ep = 180(-74,+77) keV.\n\nModelling the 3-channel spectrum near the peak count rate\n(measured from T0+19.738 to T0+25.626 s) by the CPL model\nyields alpha = -1.33(-0.29,+0.53) and Ep = 293(-120,+207) keV.\n\nAssuming the redshift z=6.782 (Saccardi et al., GCN 35756)\nand a standard cosmology with H_0 = 67.3 km/s/Mpc, Omega_M = 0.315,\nand Omega_Lambda = 0.685 (Planck Collaboration, 2014),we estimate\nthe burst isotropic energy release E_iso to 5.4(-1.6,+1.2)x10^53 erg,\nthe isotropic peak luminosity L_iso to 2.9(-0.8,+1.2)x10^53 erg/s,\nthe rest-frame peak energy of the time-integrated spectrum\nEp,i,z to 1401(-576,+599) keV, and the rest-frame peak energy at\nthe peak of the emission Ep,p,z to 2280(-934,+1611) keV.\n\nWith the obtained estimates, GRB 240218A is inside 68% prediction band\nfor both 'Amati' and 'Yonetoku' relations derived for the sample of\n>300 long KW GRBs with known redshifts (Tsvetkova et al., 2017;\nTsvetkova et al., 2021), see http://www.ioffe.ru/LEA/GRBs/GRB240218_T07200/GRB240218A_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/35758.",
"published": "2024-02-20T02:34:08.636164Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-20T02:34:08.636203Z",
"modified": "2024-02-20T02:34:08.645317Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6066,
"topic": "gcn.circular",
"uuid": "27f7de91-3708-4b67-94ee-4e60ed8f0ad2",
"title": "EPW20240219aa is Likely a GRB Event",
"submitter": "Hop gcn.circular",
"authors": "Binbin Zhang at Nanjing U <bbzhang@nju.edu.cn>",
"data": {
"date": "24/02/22 16:29:47 GMT",
"from": "Binbin Zhang at Nanjing U <bbzhang@nju.edu.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35773"
},
"title": "GCN CIRCULAR",
"number": "35773",
"subject": "EPW20240219aa is Likely a GRB Event"
},
"message_text": "Binbin Zhang (NJU), Hui Sun (NAOC), Yi-Han Iris Yin (NJU), Jun Yang (NJU), Bing Zhang (NJU), Xuefeng Wu (PMO) report on behalf of large collaboration:\n\nOur team has followed up on EP's initial X-ray flare detection (EPW20240219aa; ATel 16463; ATel 16472) and discovered a weak, untriggered gamma-ray transient in the Fermi/GBM data at 2024-02-19T06:21:42 UTC. This transient lasted approximately 50 seconds and its location aligns with that of EPW20240219aa.\n\nConsidering the factors that the gamma-ray transient is consistent with EPW20240219aa in terms of event time, duration, and location, we are inclined to believe that this is a GRB event. A preliminary spectral analysis indicates that its peak energy reaches a few hundred keV, which further supports its classification as a GRB.\n\nWe strongly recommend further follow-up on EPW20240219aa to confirm its physical nature and to detect any afterglows.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35773.",
"published": "2024-02-22T16:30:18.513313Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-22T16:30:18.513348Z",
"modified": "2024-02-22T16:30:18.524842Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6067,
"topic": "gcn.circular",
"uuid": "4b22860b-b053-4e74-b04e-0384f7d62b4f",
"title": "Fermi GRB 240222A: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "24/02/22 18:31:17 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35774"
},
"title": "GCN CIRCULAR",
"number": "35774",
"subject": "Fermi GRB 240222A: 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 GRB 240222A ( Fermi GBM team, GCN 35769) errorbox 33348 sec after notice time and 33382 sec after trigger time at 2024-02-22 18:07:54 UT, with upper limit up to 18.3 mag. Observations started at twilight. The observations began at zenith distance = 50 deg. The sun altitude is -10.1 deg.\n\nThe galactic latitude b = -6 deg., longitude l = 281 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#83850\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 33473 | 2024-02-22 18:07:54 | MASTER-SAAO | (09h 40m 49.96s , -68d 03m 28.5s) | C | 180 | 17.9 |\n 33473 | 2024-02-22 18:07:54 | MASTER-SAAO | (09h 18m 15.91s , -67d 52m 27.6s) | C | 180 | 17.4 |\n 33672 | 2024-02-22 18:11:13 | MASTER-SAAO | (09h 40m 56.74s , -68d 04m 32.3s) | C | 180 | 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/35774.",
"published": "2024-02-22T18:31:38.173411Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-22T18:31:38.173442Z",
"modified": "2024-02-22T18:31:38.182412Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6068,
"topic": "gcn.circular",
"uuid": "a16e2ce7-5913-4757-ae9b-ab3eddc6835d",
"title": "Swift GRB 240222A: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "24/02/22 18:32:47 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35775"
},
"title": "GCN CIRCULAR",
"number": "35775",
"subject": "Swift GRB 240222A: 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 GRB 240222A ( P. D'Avanzo et al., GCN 35770) errorbox 33361 sec after notice time and 33382 sec after trigger time at 2024-02-22 18:07:54 UT, with upper limit up to 18.3 mag. Observations started at twilight. The observations began at zenith distance = 50 deg. The sun altitude is -10.1 deg.\n\nThe galactic latitude b = -12 deg., longitude l = 286 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#83830\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 33473 | MASTER-SAAO | C | 180 | 17.9 |\n 33473 | MASTER-SAAO | C | 180 | 17.4 |\n 33672 | MASTER-SAAO | C | 180 | 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/35775.",
"published": "2024-02-22T18:32:55.390412Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-22T18:32:55.390445Z",
"modified": "2024-02-22T18:32:55.397529Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6054,
"topic": "gcn.circular",
"uuid": "e9b2fc10-f478-4b40-8be0-497acf002128",
"title": "GRB 240218A: Swift-BAT refined analysis",
"submitter": "Hop gcn.circular",
"authors": "Tyler Parsotan at NASA GSFC <tyler.parsotan@nasa.gov>",
"data": {
"date": "24/02/20 16:00:46 GMT",
"from": "Tyler Parsotan at NASA GSFC <tyler.parsotan@nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35761"
},
"title": "GCN CIRCULAR",
"number": "35761",
"subject": "GRB 240218A: Swift-BAT refined analysis"
},
"message_text": "S. D. Barthelmy (GSFC), H. A. Krimm (NSF),\n\nS. Laha (GSFC/UMBC), A. Y. Lien (U Tampa),\n\nC. B. Markwardt (GSFC), M. J. Moss (GSFC),\n\nD. M. Palmer (LANL), T. Parsotan (GSFC),\n\nT. Sakamoto (AGU), (i.e. the Swift-BAT team):\n\n\n\nUsing the data set from T-240 to T+200 sec from the recent telemetry downlink,\n\nwe report further analysis of BAT GRB 240218A (trigger #1215912)\n\n(Page, et al., GCN Circ. 35742). The BAT ground-calculated position is\n\nRA, Dec = 161.810, 1.295 deg which is\n\n RA(J2000) = 10h 47m 14.4s\n\n Dec(J2000) = +01d 17' 40.2\"\n\nwith an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment).\n\nThe partial coding was 36%.\n\n\n\nThe mask weighted light curve shows two major pulses, one that is broad and the other\n\nwhich is narrow.\n\nT90 (15-350 keV) is 66.93 +- 11.28 sec (estimated error including systematics).\n\n\n\nThe time-averaged spectrum from T-38.93 to T+63.55 sec is best fit by a power law\n\nwith an exponential cutoff. This fit gives a photon index 1.00 +- 0.32,\n\nand Epeak of 103.1 +- 45.5 keV (chi squared 62.59 for 56 d.o.f.). For this\n\nmodel the total fluence in the 15-150 keV band is 5.2 +- 0.3 x 10^-06 erg/cm2\n\nand the 1-sec peak flux measured from T+21.62 sec in the 15-150 keV band is\n\n3.0 +- 0.3 ph/cm2/sec. A fit to a simple power law gives a photon index\n\nof 1.51 +- 0.07 (chi squared 71.30 for 57 d.o.f.). All the quoted errors\n\nare at the 90% confidence level.\n\n\n\nThe results of the batgrbproduct analysis are available at\nhttps://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1215912/\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35761.",
"published": "2024-02-20T16:01:05.927341Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-20T16:01:05.927365Z",
"modified": "2024-02-20T16:01:05.934503Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6055,
"topic": "gcn.circular",
"uuid": "7c1b8b09-de9f-4ad2-9822-e44d64b43286",
"title": "GRB 240218A: LBT H-band detection",
"submitter": "Hop gcn.circular",
"authors": "Elisabetta Maiorano at INAF <elisabetta.maiorano@inaf.it>",
"data": {
"date": "24/02/20 16:04:34 GMT",
"from": "Elisabetta Maiorano at INAF <elisabetta.maiorano@inaf.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35762"
},
"title": "GCN CIRCULAR",
"number": "35762",
"subject": "GRB 240218A: LBT H-band detection"
},
"message_text": "A. Rossi, E. Maiorano, G. Stratta (INAF-OAS), P. D'Avanzo (INAF-OAB) report on behalf of the CIBO collaboration:\n\nWe observed the field of the long GRB 240218A, detected by Swift-BAT (Page et al., GCN 35742), Fermi-GBM (Veres and Meegan, GCN 35755) and Konus-Wind (Svinkin et al., GCN 35758), and with spectroscopic redshift of z=6.782 (Saccardi et al., GCN 35756).\n\nWe obtained 40 min of J-, 1 hr of H- and 1.2 hr of Ks-band imaging with the LUCI cameras mounted on LBT (Mt. Graham, AZ, USA) on 2024-02-19 (mid-time 08:20:00 UT), 1.3 days after the burst trigger.\n\nWe clearly detect the NIR afterglow (D'Avanzo et al., GCN 35747, Malesani et al., GCN 35749) and measure a preliminary H-band magnitude of H ~ 20.2 AB, calibrated against 2MASS field stars, and not corrected for the foreground Galactic extinction.\n\nWe acknowledge the excellent support of A. Cardwell e J. Williams from the LBTO staff and E. Marini from LBT-INAF staff, in obtaining these observations.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35762.",
"published": "2024-02-20T16:04:44.609880Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-20T16:04:44.609921Z",
"modified": "2024-02-20T16:04:44.621864Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6076,
"topic": "gcn.circular",
"uuid": "6a00d084-7bc3-4e09-aea5-c2ddc6586377",
"title": "Transient EPW20240219aa: Liverpool Telescope non-detection and limiting magnitude",
"submitter": "Hop gcn.circular",
"authors": "A. Bochenek at Liverpool John Moores University <a.m.bochenek@2023.ljmu.ac.uk>",
"data": {
"date": "24/02/23 17:19:29 GMT",
"from": "A. Bochenek at Liverpool John Moores University <a.m.bochenek@2023.ljmu.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35783"
},
"title": "GCN CIRCULAR",
"number": "35783",
"subject": "Transient EPW20240219aa: Liverpool Telescope non-detection and limiting magnitude"
},
"message_text": "A. Bochenek, K-R. Hinds, D. A. Perley (LJMU) report:\n\nWe observed the field of the X-ray transient and possible gamma-ray burst EPW20240219aa (Zhang et al., ATel 16463; Zhang, ATel 16472; Zhang et al., GCN 35773) using the IO:O optical camera on the 2m robotic Liverpool Telescope. We obtained 3x120s exposures with the SDSS-I filter between 2024-02-21 20:05:42 UT and 2024-02-21 20:13:20 UT, approximately 2.5 days after the transient.\n\nThe limiting magnitude of the image is 22.12 mag (AB). Image subtraction was performed relative to Pan-STARRS reference imaging using PSF matching, with the help of PSFEx. No new sources were identified within the 90% confidence error circle.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35783.",
"published": "2024-02-23T17:19:47.432064Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-23T17:19:47.432091Z",
"modified": "2024-02-23T17:19:47.440833Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6077,
"topic": "gcn.circular",
"uuid": "1b67c749-7351-408f-b629-21c060514def",
"title": "Swift BAT Sub-Threshold Detection of EPW20240219aa",
"submitter": "Hop gcn.circular",
"authors": "Jimmy DeLaunay at Penn State <delauj2@gmail.com>",
"data": {
"date": "24/02/23 19:20:28 GMT",
"from": "Jimmy DeLaunay at Penn State <delauj2@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35784"
},
"title": "GCN CIRCULAR",
"number": "35784",
"subject": "Swift BAT Sub-Threshold Detection of EPW20240219aa"
},
"message_text": "James DeLaunay (PSU), Aaron Tohuvavohu (U Toronto), Samuele Ronchini (PSU), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:\n\nSwift/BAT did not localize EPW20240219aa onboard (ATel 16463; ATel 16472).\n\nIn a ground analysis of a 300 s BAT survey exposure starting at 2024-02-19T06:18:06 we find a source matching the position of EPW20240219aa at a SNR of 5.4. \n\nThe BAT position is \nRA, Dec = 80.046, +25.500 deg which is\n RA(J2000) = 05h 20m 11.04s\n Dec(J2000) = +25d 30â² 00.0â³\nwith an estimated uncertainty of 4 arcmin radius.\n\nAn inspection of the BAT rates data shows this burst starting at ~2024-02-19T06:21:44 and lasting ~55 s, matching the observation by Fermi GBM (GCN 35773, GCN 35776). \n\nWith the observation by BAT that matches spatially and temporally we conclude that EPW20240219aa is most likely a GRB. \n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35784.",
"published": "2024-02-23T19:20:46.823367Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-23T19:20:46.823403Z",
"modified": "2024-02-23T19:20:46.833719Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6056,
"topic": "gcn.circular",
"uuid": "f1fb4dc3-466d-43bd-804c-f9733736b05c",
"title": "GRB 240215B: Fermi GBM Observation",
"submitter": "Hop gcn.circular",
"authors": "Lorenzo Scotton at UAH <lscottongcn@outlook.com>",
"data": {
"date": "24/02/20 16:45:45 GMT",
"from": "Lorenzo Scotton at UAH <lscottongcn@outlook.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35763"
},
"title": "GCN CIRCULAR",
"number": "35763",
"subject": "GRB 240215B: Fermi GBM Observation"
},
"message_text": "L. Scotton (UAH) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 19:51:43.85 UT on 15 February 2024, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 240215B (trigger 729719508/240215828),\nwhich was also detected by Swift/BAT-GUANO (J. DeLaunay et al. 2024, GCN 35739),\nand GRBAlpha (A. Pal et al. 2024, GCN 35752).\nThe Fermi GBM Final Real-time Localization was reported in GCN 35740,\nbut was mislabelled as GRB 240215C.\nAfter manual inspection, a more accurate on-ground location was found to be\nRA = 309.52, Dec = -48.74, with a statistical uncertainty of 2.54 degrees.\n\nThe angle from the Fermi LAT boresight is 94 degrees.\n\nThe GBM light curve consists of a single emission episode with a duration (T90)\nof about 21 s (50-300 keV). The time-averaged spectrum\nfrom T0-5.5 to T0+21.5 s is best fit by\na power law function with an exponential high-energy cutoff.\nThe power law index is -1.16 +/- 0.04 and the cutoff energy,\nparameterized as Epeak, is 210 +/- 10 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.12 +/- 0.04)E-05 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+4.9 s in the 10-1000 keV band is 10.8 +/- 0.4 ph/s/cm^2.\n\nA Band function fits the spectrum equally well\nwith Epeak= 190 +/- 20 keV, alpha = -1.13 +/- 0.05 and beta = -2.5 +/- 0.3.\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/35763.",
"published": "2024-02-20T16:45:59.890251Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-20T16:45:59.890290Z",
"modified": "2024-02-20T16:45:59.897716Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6057,
"topic": "gcn.circular",
"uuid": "1235e186-5baf-4a41-ae25-0cbad251d5ed",
"title": "GRB 240216A: Glowbug gamma-ray detection",
"submitter": "Hop gcn.circular",
"authors": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"data": {
"date": "24/02/20 17:23:14 GMT",
"from": "C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35764"
},
"title": "GCN CIRCULAR",
"number": "35764",
"subject": "GRB 240216A: 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 240216A, which was also detected by Fermi/GBM (GCN 35736), GRBAlpha (GCN 35753), Konus/Wind (Trigger Time 10:57:01.022), and INTEGRAL/SPI-ACS (Trigger 10579).\n\nUsing an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2024-02-16 10:57:01.696 with a duration of 1.02 s and a total significance of about 15.4 sigma. The light curve comprises a single peak.\n\nUsing a standard power-law function with an exponential high-energy cutoff [3] to model the emission over this duration results in a photon index dN/dE~E^x of x=0.3 and a cutoff energy (\"Epeak\") of 1230 keV. The modeled 10-10000 keV fluence is 1.1e-06 erg/cm^2.\n\nThe analysis results presented here are preliminary and use a response function that lacks a detailed characterization of the surrounding passive structure of the ISS.\n\nGlowbug is a NASA-funded technology demonstrator for sensitive, low-cost gamma-ray transient telescopes developed, built, and operated by the U.S. Naval Research Laboratory (NRL) with support from the University of Alabama in Huntsville, USRA, and NASA MSFC. It was launched on 2023 March 15 aboard the Department of Defense Space Test Programâs STP-H9 to the ISS. The detector comprises 12 large-area (15 cm x 15 cm) CsI:Tl panels covering the surface of a half cube, and two hexagonal (5-cm diameter, 10-cm length) CLLB scintillators, giving it a large field of view (instantaneous FoV ~2/3 sky) over a wide energy band of 50 keV to >2 MeV.\n\n[1] Grove, J.E. et al. 2020, Proc. Yamada Conf. LXXI, arXiv:2009.11959\n[2] Woolf, R.S. et al. 2022, Proc. SPIE, 12181, id. 121811O\n[3] Goldstein, A. et al. 2020, ApJ 895, 40, arXiv :1909.03006\n\nDistribution Statement A: Approved for public release. Distribution is unlimited.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35764.",
"published": "2024-02-20T17:23:31.418129Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-20T17:23:31.418171Z",
"modified": "2024-02-20T17:23:31.427241Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6058,
"topic": "gcn.circular",
"uuid": "1dc61b30-4a6d-451e-993b-4d6fc81d8e86",
"title": "GRB 240218A: MeerLICHT upper limits",
"submitter": "Hop gcn.circular",
"authors": "Simon de Wet at University of Cape Town <simdewet@gmail.com>",
"data": {
"date": "24/02/20 20:32:37 GMT",
"from": "Simon de Wet at University of Cape Town <simdewet@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35765"
},
"title": "GCN CIRCULAR",
"number": "35765",
"subject": "GRB 240218A: MeerLICHT upper limits"
},
"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 0.6m wide-field MeerLICHT optical telescope located in Sutherland, South Africa, obtained a repeating series of 60s exposures in the q,u,g,r,i,z filters following the detection of GRB 240218A by Swift (Page et al., GCN 35742). Our observations began 96 seconds after the Swift trigger and continued for approximately 1 hour following the filter sequence quqgqrqiqz.\n\nWe do not detect an optical source at a position consistent with the high-redshift counterpart detected by REM and the VLT (D'Avanzo et al., GCN 35747; Malesani, GCN 35749; Saccardi et al., GCN 35756) in any individual exposure. Our earliest 3-sigma AB limiting magnitudes in each filter are:\n\nu > 19.29 at 3.6 minutes post-trigger\ng > 20.58 at 6.5 minutes post-trigger\nq > 21.10 at 2.1 minutes post-trigger\nr > 20.29 at 9.4 minutes post-trigger\ni > 19.81 at 13.4 minutes post-trigger\nz > 18.87 at 15.3 minutes post-trigger.\n\nWe additionally co-added all of the images in each filter and obtain the following 3-sigma AB limiting magnitudes at an average time of 36 minutes post-trigger:\n\nu > 20.33\ng > 21.61\nq > 22.67\nr > 21.21\ni > 20.54\nz > 19.54.\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/35765.",
"published": "2024-02-20T20:32:55.293142Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-20T20:32:55.293165Z",
"modified": "2024-02-20T20:32:55.302455Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6059,
"topic": "gcn.circular",
"uuid": "7f21db31-2dbd-4971-a9be-bf8fd0b72a02",
"title": "Swift GRB240221.92: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "24/02/21 22:56:27 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35766"
},
"title": "GCN CIRCULAR",
"number": "35766",
"subject": "Swift GRB240221.92: 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 GRB240221.92 (trigger No 1216743,16h 21m 22.32s , -15d 40m 33.6s, R=0.00130556) errorbox 2112 sec after notice time and 2135 sec after trigger time at 2024-02-21 22:44:39 UT, with upper limit up to 17.9 mag. Observations started at twilight. The observations began at zenith distance = 67 deg. The sun altitude is -13.8 deg.\n\nThe galactic latitude b = 23 deg., longitude l = 360 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#83502\n\nWe obtain a following upper limits.\n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 2146 | MASTER-Tunka | C | 20 | 17.4 |\n 2166 | MASTER-Tunka | C | 60 | 17.9 | Coadd\n 2176 | MASTER-Tunka | C | 20 | 17.2 |\n 2208 | MASTER-Tunka | C | 20 | 17.2 |\n 2239 | MASTER-Tunka | C | 20 | 17.4 |\n 2268 | MASTER-Tunka | C | 15 | 17.2 |\n 2292 | MASTER-Tunka | C | 15 | 16.9 |\n 2319 | MASTER-Tunka | C | 15 | 17.2 |\n 2343 | MASTER-Tunka | C | 15 | 17.1 |\n 2461 | MASTER-Tunka | C | 15 | 17.2 |\n 2485 | MASTER-Tunka | C | 15 | 17.0 |\n 2596 | MASTER-Tunka | C | 15 | 17.2 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35766.",
"published": "2024-02-21T22:56:44.107790Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-21T22:56:44.107836Z",
"modified": "2024-02-21T22:56:44.117419Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6609,
"topic": "gcn.circular",
"uuid": "ef7991db-eb9f-442e-b603-f686ab654da9",
"title": "GRB 240414A: GMG observation",
"submitter": "Hop gcn.circular",
"authors": "wangbaiting@ynao.ac.cn",
"data": {
"date": "24/04/16 06:54:24 GMT",
"from": "wangbaiting@ynao.ac.cn",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36131"
},
"title": "GCN CIRCULAR",
"number": "36131",
"subject": "GRB 240414A: GMG observation"
},
"message_text": "B.-T. Wang, R.-Z. Li, J. Mao, X.-L. Zhang, J.-M. Bai (YNAO) report:\n\nWe observed the field of GRB 240414A (Caputo et al. GCN 36083) by the GMG telescope in Yunnan observatories. The observation time began from UT 14:25:26.531\t April 14, 2024, about 12 hours from the trigger. The preliminary results are shown as\n\n----------------------------------------------------\nUT\t\t\t\tfilter\tmag\n----------------------------------------------------\n2024-04-14T14:25:26.531\t\tsdssr\t20.6 ± 0.3\n----------------------------------------------------\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36131.",
"published": "2024-04-16T06:54:42.063762Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-16T06:54:42.063773Z",
"modified": "2024-04-16T06:54:42.070720Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6069,
"topic": "gcn.circular",
"uuid": "f6100cb6-f2cc-49cd-b8d7-0757ed5d7027",
"title": "Fermi GBM Sub-Threshold Detection of EPW20240219aa as a likely GRB",
"submitter": "Hop gcn.circular",
"authors": "Cori Fletcher at USRA <cfletcher@usra.edu>",
"data": {
"date": "24/02/22 22:31:42 GMT",
"from": "Cori Fletcher at USRA <cfletcher@usra.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35776"
},
"title": "GCN CIRCULAR",
"number": "35776",
"subject": "Fermi GBM Sub-Threshold Detection of EPW20240219aa as a likely GRB"
},
"message_text": "C. Fletcher (USRA), S. Lesage (UAH) and P. Jenke (UAH) report on behalf of the Fermi-GBM Team:\n\nEinstein Probe detected a bright X-ray flare (EPW20240219aa; ATel 16463; ATel 16472) at 06:21:42 UT on February 19, 2024. There was no Fermi-GBM onboard trigger around the event. Zhang et al. 2024 (GCN 35773) found a possible GRB event in Fermi-GBM data at that time.\n\nAn automated, blind search developed for short gamma-ray bursts below the onboard triggering threshold in Fermi-GBM identified EPW20240219aa with a low chance of being a short gamma-ray burst. The rate of GBM signals that meet the low reliability threshold (including onboard triggers) is 200/year. An initial estimate of the chance coincidence, including only temporal information, is ~4.1 sigma.\n\nThe GBM targeted search [1], the most sensitive, coherent search for\nGRB-like signals identified a transient most significantly on the 8.192 s\ntimescale, with a false alarm rate of 7.7e-05 Hz and a location consistent with\nthe Einstein Probe event, using the standard search protocol with a S/N of 9.2.\nThe GBM targeted search event was found with the highest\nsignificance with a \"normal\" spectrum (Band function with Epeak = 230 keV, alpha = -1.0, beta = -2.3) for a GRB.\n\n\n[1] Goldstein et al. 2019 arXiv:1903.12597\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35776.",
"published": "2024-02-22T22:31:59.194497Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-22T22:31:59.194535Z",
"modified": "2024-02-22T22:31:59.204773Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6070,
"topic": "gcn.circular",
"uuid": "15bbb216-12a0-40b2-8f55-aad61c1e8f60",
"title": "GRB 240222A: Swift/UVOT Upper Limits",
"submitter": "Hop gcn.circular",
"authors": "Samantha Oates at University of Birmingham <samantha.oates@alumni.ucl.ac.uk>",
"data": {
"date": "24/02/22 22:34:59 GMT",
"from": "Samantha Oates at University of Birmingham <samantha.oates@alumni.ucl.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35777"
},
"title": "GCN CIRCULAR",
"number": "35777",
"subject": "GRB 240222A: Swift/UVOT Upper Limits"
},
"message_text": "S. R. Oates (Lancaster. U) and P. D'Avanzo (INAF-OAB) report on behalf of the\nSwift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 240222A\n98s after the BAT trigger (D'Avanzo et al., GCN Circ 35770). No optical\nafterglow consistent with X-ray (D'Avanzo et al., GCN Circ. 35770) position is\ndetected in 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 initial exposures are:\n\nFilter T_start(s) T_stop(s) Exp(s) Mag\n\nwhite 98 1192 205 >20.9\nv 642 1068 58 >18.5\nb 567 1168 58 >19.5\nu 311 1142 285 >20.0\nuvw1 691 1118 39 >18.3\nuvm2 666 861 39 >18.0\nuvw2 617 1044 58 >18.6\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.16 in the direction of the burst\n(Schlegel et al. 1998).\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35777.",
"published": "2024-02-22T22:35:07.127793Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-22T22:35:07.127845Z",
"modified": "2024-02-22T22:35:07.138084Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6610,
"topic": "gcn.circular",
"uuid": "2ba9bac7-e9ee-4bc1-a8c7-fa8ed60fa512",
"title": "GRB 240415A: Earliest optical followup with the Kinder observations",
"submitter": "Hop gcn.circular",
"authors": "Amar Aryan <amararyan941@gmail.com>",
"data": {
"date": "24/04/16 10:16:20 GMT",
"from": "Amar Aryan <amararyan941@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36132"
},
"title": "GCN CIRCULAR",
"number": "36132",
"subject": "GRB 240415A: Earliest optical followup with the Kinder observations"
},
"message_text": "A. Aryan, T.-W. Chen, W.-J. Hou, H.-Y. Hsiao, C.-H. Lai, Y.-C. Pan (all NCUIA), S. Yang (HNAS), A. Sankar.K, M.-H. Lee, C.-S. Lin, C.-C. Ngeow, H.-C. Lin, J.-K. Guo (all NCUIA), H. F. Stevance, S. J. Smartt (Oxford/QUB), S. Srivastav (Oxford), M. Fulton, T. Moore, C. Angus, and A. Aamer (all QUB) report:\n\nWe observed the field of GRB 240415A (Fermi GBM team, GCN 36107; Moss et al., GCN 36108; Evans et al., GCN 36109) using the Lulin One-meter Telescope (LOT) at Lulin Observatory in Taiwan as part of the Kinder collaboration (Chen et al., AstroNote 2021-92). The optical afterglow candidate of GRB 240415A was identified (Pankov et al., GCN 36118, GCN 36121) and followed with several instruments (Lipunov et al., GCN 36119; Moskvitin et al., GCN 36122; Reguitti et al., GCN 36123, Schneider et al, GCN 36124).\n\nThe first LOT epoch of observations started at 13:17 UT on the 15th of April 2024. We followed the standard IRAF (Tody D., 1993, ASPC, 52, 173) procedure to reduce the images. Additionally, PSF photometry was performed using DAOPHOT II (Stetson P. B., 1987, PASP, 99, 191). The optical afterglow was clearly visible in the combined frame and was within the error box reported by Evans et al. (GCN 36128). The details of the observations and the preliminary magnitude (in the AB system) of the afterglow are as follows:\n\nTelescope | Filter | MJD | t-t0 | Exposure | Magnitude | avg. Seeing | med. Airmass\nLOT | r | 60415.554 | 6.86 hrs | 300 sec * 6 | 21.32 +/- 0.25 | 1\".92 | 1.67\n\nThe reported magnitude is calibrated using 10 nearby stars from the PanSTARRS catalog and is not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V) = 0.02 mag in the direction of the burst (Schlafly & Finkbeiner 2011).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36132.",
"published": "2024-04-16T10:16:37.947525Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-16T10:16:37.947539Z",
"modified": "2024-04-16T10:16:37.956310Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6744,
"topic": "gcn.circular",
"uuid": "0835525d-2031-489b-b968-8d5d0d6e1e98",
"title": "GRB 240419B: optical afterglow from the NOT",
"submitter": "Hop gcn.circular",
"authors": "Daniele B. Malesani at IMAPP / Radboud University <d.malesani@astro.ru.nl>",
"data": {
"date": "24/04/20 06:40:47 GMT",
"from": "Daniele B. Malesani at IMAPP / Radboud University <d.malesani@astro.ru.nl>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36191"
},
"title": "GCN CIRCULAR",
"number": "36191",
"subject": "GRB 240419B: optical afterglow from the NOT"
},
"message_text": "Daniele B. Malesani (DAWN/NBI and Radboud Univ.) and David Jones (NOT) report on behalf of a larger collaboration.\n\nWe observed the field of GRB 240419B (Dichiara et al., GCN 36180) with the Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observations were carried out straddling the morning twilight, at airmass ~2, and the seeing was about 1.7\".\n\nAn object consistent with the X-ray localization error circle (Osborne et al., GCN 36186) is detected in our images. Its coordinates are (J2000):\n\nRA = 21:43:35.289\nDec = +04:14:05.30\n\nCalibrating against nearby point-like sources from the Pan-STARRS catalog, we measure the following AB magnitudes:\n\nr = 22.01 +- 0.10 (Apr 20.214 UT, or 0.698 days after the trigger);\nz = 20.81 +- 0.19 (Apr 20.222 UT, or 0.701 days after the trigger).\n\nThis object is not visible in the Legacy Survey images, which are deeper than ours, and we thus conclude that it is the optical afterglow of GRB 240419B. We note however the presence of a fainter (r ~ 23.2), distinct source visible in the Legacy Survey, approximately 2.5\" to the west of the afterglow. Given the relatively large offset, the relation of this object with the GRB is unclear.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36191.",
"published": "2024-04-20T06:41:02.580668Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-20T06:41:02.580688Z",
"modified": "2024-04-20T06:41:02.589900Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6071,
"topic": "gcn.circular",
"uuid": "334b25f0-962c-40ae-a35a-628601a6a135",
"title": "GRB 240222A: Fermi GBM Observation",
"submitter": "Hop gcn.circular",
"authors": "Joe Mangan at IJCLab <joseph.mangan@ijclab.in2p3.fr>",
"data": {
"date": "24/02/22 23:39:37 GMT",
"from": "Joe Mangan at IJCLab <joseph.mangan@ijclab.in2p3.fr>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35778"
},
"title": "GCN CIRCULAR",
"number": "35778",
"subject": "GRB 240222A: Fermi GBM Observation"
},
"message_text": "J. Mangan (CNRS/IJCLab) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 08:51:31.47 UT on 22 February 2024, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 240222A (trigger 730284696/240222369).\nwhich was also detected by Swift BAT (P. D'Avanzo et al. 2024, GCN 35770).\nThe Fermi GBM on-ground location is consistent with the Swift BAT position.\n\nThe angle from the Fermi LAT boresight is 109 degrees.\n\nThe GBM light curve consists of a single emission episode with a duration (T90)\nof about 3.8 s (50-300 keV). The time-averaged spectrum\nfrom T0-5.9 to T0+3.3 s is best fit by\na simple power law function with index -1.4 +/- 0.1.\n\nThe event fluence (10-1000 keV) in this time interval is\n(9.2 +/- 1.9)E-07 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0-0.19 s in the 10-1000 keV band is 4 +/- 0.7 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/35778.",
"published": "2024-02-22T23:39:50.323006Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-22T23:39:50.323042Z",
"modified": "2024-02-22T23:39:50.334060Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6072,
"topic": "gcn.circular",
"uuid": "11bcd929-b8f4-4a71-8016-7c6b92ee3302",
"title": "Swift-BAT triggers 1216907-1216911 are not astrophysical",
"submitter": "Hop gcn.circular",
"authors": "Simone Dichiara at Pennsylvania State University <sbd5667@psu.edu>",
"data": {
"date": "24/02/23 00:55:09 GMT",
"from": "Simone Dichiara at Pennsylvania State University <sbd5667@psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35779"
},
"title": "GCN CIRCULAR",
"number": "35779",
"subject": "Swift-BAT triggers 1216907-1216911 are not astrophysical"
},
"message_text": "S. Dichiara (PSU) reports on behalf of the Neil Gehrels Swift Observatory Team:\n\nSwift triggers 1216907, 1216909, 1216910, 1216911 and 1216748 were caused by a star track loss-of-lock event, and are not interesting astrophysical events.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35779.",
"published": "2024-02-23T00:55:23.752990Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-23T00:55:23.753076Z",
"modified": "2024-02-23T00:55:23.764931Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6611,
"topic": "gcn.circular",
"uuid": "a9620b66-d0d8-4a12-b84a-5752ad9f1ee0",
"title": "GRB 240414A: GAD Observatory, La Spezia, Italy ,upper limit",
"submitter": "Hop gcn.circular",
"authors": "Claudio Lopresti <cl3lop@gmail.com>",
"data": {
"date": "24/04/16 10:25:27 GMT",
"from": "Claudio Lopresti <cl3lop@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36133"
},
"title": "GCN CIRCULAR",
"number": "36133",
"subject": "GRB 240414A: GAD Observatory, La Spezia, Italy ,upper limit"
},
"message_text": "Claudio Lopresti (Gruppo Astronomia Digitale - GAD Observatory, La Spezia, Italy)\nMember of:\nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili, GRB section.\nGAD - Gruppo Astronomia Digitale.\n\nin a large 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)\n\nreport:\nWe imaged the field of GRB 240414Adetected by SWIFT(trigger 1221714)\nwith the telescope LX200 12â of GAD Observatory, La Spezia, Italy\n\nThe observations started 1026 min after the GRB trigger,\nwith a Shmidt-Cassegrain telescope D=304 mm with reducer F/D=4.75.\nat the following position (+/- 2 arcsec):\n\nRA (J2000): 12h 19m 8.07s\nDec (J2000): +56d 44' 26.0\"\n\nscope D=300 mm F/D=4.8.\n\nWeather conditions were medium.\n\nThe observation with a series of exposures started at 024-04-14 19:28:17 UT\nand ended at 2024-04-14 22:27:10 UT\n\nWe co-added 88 exposures of 90 sec each.\n\nStart T0+ End T0+ R lim\n1026 min 1205 min 19,9\n\nWe did not found any optical counterpart in 12h 19m 8.07s +56d 44' 26.0\" position and in the error box of the XRT candidate.\nref.: K.L. Page at U Leicester GCN 36083\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\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36133.",
"published": "2024-04-16T10:25:43.853547Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-16T10:25:43.853569Z",
"modified": "2024-04-16T10:25:43.859277Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6073,
"topic": "gcn.circular",
"uuid": "162ff67d-9dec-4ebf-a192-395ae5d74add",
"title": "GRB 240222A: Swift-XRT refined Analysis",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/02/23 01:05:15 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35780"
},
"title": "GCN CIRCULAR",
"number": "35780",
"subject": "GRB 240222A: Swift-XRT refined Analysis"
},
"message_text": "A.P. Beardmore (U. Leicester), R. Brivio (INAF-OAB), A. D'Ai\n(INAF-IASFPA), A. Melandri (INAF-OAR), S. Dichiara (PSU), J.A. Kennea\n(PSU), A. Tohuvavohu (U. Toronto), J.P. Osborne (U. Leicester) and P.A.\nEvans report on behalf of the Swift-XRT team:\n\nWe have analysed 6.6 ks of XRT data for GRB 240222A, from 106 s to 41.2\nks after the BAT trigger. The data comprise 9 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 = 143.2254,\n-68.0305 which is equivalent to:\n\nRA (J2000): 09 32 54.10\nDec(J2000): -68 01 49.7\n\nwith an uncertainty of 3.5 arcsec (radius, 90% confidence).\n\nThe light curve can be modelled with a power-law decay with a decay\nindex of alpha=2.02 (+0.12, -0.11).\n\nA spectrum formed from the PC mode data can be fitted with an absorbed\npower-law with a photon spectral index of 1.52 (+0.24, -0.12). The\nbest-fitting absorption column is consistent with the Galactic value\nof 1.7 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed\n(unabsorbed) 0.3-10 keV flux conversion factor deduced from this\nspectrum is 4.6 x 10^-11 (5.3 x 10^-11) erg cm^-2 count^-1.\n\nA summary of the PC-mode spectrum is thus:\nTotal column:\t 1.7 (+/-0.9) x 10^21 cm^-2\nGalactic foreground: 1.7 x 10^21 cm^-2\nExcess significance: <1.6 sigma\nPhoton index:\t 1.52 (+0.24, -0.12)\n\nIf the light curve continues to decay with a power-law decay index of\n2.02, the count rate at T+24 hours will be 1.3 x 10^-5 count s^-1,\ncorresponding to an observed (unabsorbed) 0.3-10 keV flux of 5.8 x\n10^-16 (6.7 x 10^-16) erg cm^-2 s^-1.\n\nThe results of the XRT-team automatic analysis are available at\nhttp://www.swift.ac.uk/xrt_products/01216804.\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/35780.",
"published": "2024-02-23T01:05:27.162229Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-23T01:05:27.162261Z",
"modified": "2024-02-23T01:05:27.169107Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6074,
"topic": "gcn.circular",
"uuid": "fde2bb8b-b93b-4101-bdcb-a45ad4f161f6",
"title": "GRB 240222A: Swift-BAT refined analysis",
"submitter": "Hop gcn.circular",
"authors": "Amy <yarleen@gmail.com>",
"data": {
"date": "24/02/23 03:51:30 GMT",
"from": "Amy <yarleen@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35781"
},
"title": "GCN CIRCULAR",
"number": "35781",
"subject": "GRB 240222A: Swift-BAT refined analysis"
},
"message_text": "H. A. Krimm (NSF), S. D. Barthelmy (GSFC),\nP. D'Avanzo (INAF-OAB), S. Laha (GSFC/UMBC),\nA. Y. Lien (U Tampa), C. B. Markwardt (GSFC),\nM. J. Moss (GSFC), D. M. Palmer (LANL),\nT. Parsotan (GSFC), T. Sakamoto (AGU)\n(i.e. the Swift-BAT team):\n\nUsing the data set from T-60 to T+243 sec from the recent telemetry\ndownlink, we report further analysis of BAT GRB 240222A (trigger #1216804)\n(D'Avanzo et al., GCN Circ. 35770). The BAT ground-calculated position is\nRA, Dec = 143.209, -68.034 deg which is\n RA(J2000) = 09h 32m 50.2s\n Dec(J2000) = -68d 02' 03.7\"\nwith an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 94%.\n\nThe mask-weighted light curve shows a main pulse that starts\nat ~T-0.4 s, peaks at ~T0, and ends at ~T+1.4 s. In addition,\nthere is a small precursor pulse at ~T-2.7 s. T90 (15-350 keV)\nis 3.94 +- 2.35 sec (estimated error including systematics).\n\nThe time-averaged spectrum from T-2.70 to T+1.37 sec is best fit\nby a simple power-law model. The power law index of the time-averaged\nspectrum is 0.75 +- 0.23. The fluence in the 15-150 keV band\nis 2.5 +- 0.3 x 10^-7 erg/cm2. The 1-sec peak photon flux measured\nfrom T-0.20 sec in the 15-150 keV band is 1.3 +- 0.2 ph/cm2/sec.\nAll the quoted errors are at the 90% confidence level.\n\nThe results of the batgrbproduct analysis are available at\nhttps://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1216804/\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35781.",
"published": "2024-02-23T03:51:48.777648Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-23T03:51:48.777669Z",
"modified": "2024-02-23T03:51:48.786072Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6075,
"topic": "gcn.circular",
"uuid": "2509fcb2-2281-49e1-a90a-1f2781c47785",
"title": "GRB 240222A: GECAM detection of a burst",
"submitter": "Hop gcn.circular",
"authors": "wenlongzhang2018@163.com",
"data": {
"date": "24/02/23 06:22:36 GMT",
"from": "wenlongzhang2018@163.com",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35782"
},
"title": "GCN CIRCULAR",
"number": "35782",
"subject": "GRB 240222A: GECAM detection of a burst"
},
"message_text": "Sheng-Lun Xie, Shao-Lin Xiong, Wen-Long Zhang report on behalf of the GECAM team:\n\nGECAM-B was triggered in-flight and on-ground by a short burst, GRB 240222A, at 2024-02-22T08:51:31.500 UTC (T0), which was also observed by Fermi/GBM (GCN #35769 and GCN #35778) and Swift/BAT (GCN #35770 and GCN #35781).\n\nAccording to the GECAM-B light curve, this burst consists of roughly a pulse with a total duration of ~3 sec.\n\nThe GECAM-B ground calculated location (J2000) is:\nRa: 169.76 deg\nDec: -71.58 deg\nErr: 14.01 deg (1-sigma, statistical only)\nThis GECAM-B localization is consistent with that of Swift/BAT within the error.\n\nWe note that these results are very preliminary. Refined analysis will be reported later.\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/35782.",
"published": "2024-02-23T06:22:52.081507Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-23T06:22:52.081548Z",
"modified": "2024-02-23T06:22:52.100016Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6078,
"topic": "gcn.circular",
"uuid": "ba4441f8-d58f-4350-8757-8dfaebb3a03f",
"title": "Insight-HXMT/HE Sub-Threshold Detection of Transient EPW20240219aa",
"submitter": "Hop gcn.circular",
"authors": "yqzhang_cl@163.com",
"data": {
"date": "24/02/24 07:20:16 GMT",
"from": "yqzhang_cl@163.com",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35785"
},
"title": "GCN CIRCULAR",
"number": "35785",
"subject": "Insight-HXMT/HE Sub-Threshold Detection of Transient EPW20240219aa"
},
"message_text": "Ce Cai (HEBNU), Shao-Lin Xiong, Li-Ming Song, Shuang-Nan Zhang (IHEP)\nreport on behalf of the Insight-HXMT team:\n\nEinstein Probe detected a bright X-ray flare EPW20240219aa, which started\nfrom 2024-02-19T06:21:42 UTC (denoted as T0) with a duration about 200 s\n(ATel 16463; ATel 16472). There is no Insight-HXMT/HE on-ground automated\nblind search trigger around this event. Thus we implemented a targeted search\nfor sub-threshold burst signals within T0+/-100 s, using an improved coherent\nsearch algorithm [1].\n\nFrom the targeted search, we identified a gamma-ray transient most significant\non the 4 s timescale, with the peak time of about T0+40 s and duration of about 50 s,\nmatching the observation by Fermi GBM (GCN 35773, GCN 35776) and Swift/BAT\n(GCN 35784). Its location is also consistent with the EP (ATel 16463) and Swift/BAT\npositions (GCN #35784). The spectrum is relatively hard (Band function with\nEpeak = 1 MeV, alpha = 0, beta = -1.5).\n\nWe note that these results are very preliminary. Refined analysis will be reported later.\n\nAll measurements above are made with the CsI detectors operating in the\nregular mode with the energy range of about 80-800 keV (deposited energy).\nOnly gamma-rays with energy greater than about 200 keV can penetrate\nthe spacecraft and leave signals in the CsI detectors installed inside\nthe telescope.\n\nInsight-HXMT is the first Chinese space X-ray telescope, which was\nfunded jointly by the China National Space Administration (CNSA) and\nthe Chinese Academy of Sciences (CAS).\nMore information about it could be found at:\nhttp://www.hxmt.org.\n\n[1] Cai, C., Xiong, S. L., Li, C. K., et al. 2021, MNRAS, 508, 3910S\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35785.",
"published": "2024-02-24T07:20:35.148854Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-24T07:20:35.148884Z",
"modified": "2024-02-24T07:20:35.157928Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6079,
"topic": "gcn.circular",
"uuid": "d446e64c-a9af-4139-92c3-07286e5251d1",
"title": "Transient EPW20240219aa: upper limit in gamma-ray range from SPI-ACS/INTEGRAL observations",
"submitter": "Hop gcn.circular",
"authors": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"data": {
"date": "24/02/24 10:25:23 GMT",
"from": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35786"
},
"title": "GCN CIRCULAR",
"number": "35786",
"subject": "Transient EPW20240219aa: upper limit in gamma-ray range from SPI-ACS/INTEGRAL observations"
},
"message_text": "P. Minaev (IKI), A. Pozanenko (IKI), I. Chelovekov (IKI), S. Grebenev (IKI) report on behalf of GRB IKI FuN:\n\nWe analyzed publicly available SPI-ACS/INTEGRAL data to search for possible counterpart of the X-ray flare EPW20240219aa detected by Einstein Probe (ATel 16463; ATel 16472), which is also found in Fermi/ GBM (GCN 35773, GCN 35776), /SwiftBAT (DeLaunay et al., GCN 35784 and Insight-HXMT/HE\n (Cai et al., GCN 35785). We did not find any statistically significant event in time interval of (-1000, 1000) s since 2024-02-19 06:21:42 (UTC). The non-detection of the X-ray flare EPW20240219aa could be result from low sensitivity of SPI-ACS in the direction of the source of EPW20240219aa (the angle between an the angle between axis of ACS is 159 degrees). Using cross-calibration model of SPI-ACS effective area obtained in [1], we estimated the 3 sigma fluence upper limit for the EPW20240219aa with the duration of 50 s and E_peak = 230 keV (GBM candidate, GCN 35773, GCN 35776) to be F = 5.2*E-6 erg/cm**2 in the 10-1000 keV energy band.\n [1] â Minaev et al., MNRAS, 525, 2411, 2023\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35786.",
"published": "2024-02-24T10:25:38.934700Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-24T10:25:38.934732Z",
"modified": "2024-02-24T10:25:38.943165Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6612,
"topic": "gcn.circular",
"uuid": "54ed940e-a8c9-4a92-aef2-7b4188d60d10",
"title": "GRB 240415A: Fermi GBM Observation",
"submitter": "Hop gcn.circular",
"authors": "Cuán de Barra at UCD <cuan.debarra@ucdconnect.ie>",
"data": {
"date": "24/04/16 10:26:05 GMT",
"from": "Cuán de Barra at UCD <cuan.debarra@ucdconnect.ie>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36134"
},
"title": "GCN CIRCULAR",
"number": "36134",
"subject": "GRB 240415A: Fermi GBM Observation"
},
"message_text": "C. de Barra (UCD) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team:\n\nAt 06:26:57.60 UT on 15 April 2024, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 240415A (trigger 734855222/240415269) which was also detected by Swift BAT (M.J. Moss et al. 2024, GCN 36108).\n\nThe Fermi GBM on-ground location (Fermi GBM Team, GCN 36107) is consistent with the Swift BAT position. The angle from the Fermi LAT boresight is 125.0 degrees\n\nThe GBM light curve contains a single emission episode with a duration (T90)\nof about 10 s (50-300 keV). The time-averaged spectrum\nfrom T0-4.1 to T0+6.1 s is best fit by is best fit by a Comptonized Epeak function with Epeak = 42.10 +/- 5.26 keV, and alpha = -1.58 +/- 0.14\n\nThe event fluence (10-1000 keV) in this time interval is (1.8 +/- 0.1)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+0.58 s in the 10-1000 keV band is 7.7 +/- 0.3 ph/s/cm^2. \n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog:\nhttps://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html\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/36134.",
"published": "2024-04-16T10:26:11.914186Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-16T10:26:11.914198Z",
"modified": "2024-04-16T10:26:11.919738Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6080,
"topic": "gcn.circular",
"uuid": "5c4c0c24-28d3-4aec-ad01-f4f8b12bd046",
"title": "Transient EPW20240219aa: Mondy optical observations",
"submitter": "Hop gcn.circular",
"authors": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"data": {
"date": "24/02/24 13:32:36 GMT",
"from": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35787"
},
"title": "GCN CIRCULAR",
"number": "35787",
"subject": "Transient EPW20240219aa: Mondy optical observations"
},
"message_text": "N. Pankov (HSE, IKI), A. Pozanenko (IKI), E. Klunko (ISTP), S. Belkin (IKI, HSE) report on behalf of IKI-GRB-FuN:\n\nWe observed the field of a likely GRB event EPW20240219aa (Zhang et al., GCN 35773) which was also detected by Fermi GBM (Fletcher et al., GCN 35776; Mangan & Meegan, GCN 35778), Swift BAT (DeLaunay et al., GCN 35784), and and Insight-HXMT/HE (Cai et al., GCN 35785) with AZT-33IK telescope of Sayan observatory (Mondy). The observations started on 2024-02-23 (UT) 12:31:49, i.e. t-T0 = 4.276478 days after trigger. We took 30x120 sec frames in R-filter. After human vetting we list the two potential galaxies candidates, which show brightness excess more than 3sigma in comparison with USNO-B1.0 catalog.\n\n\n RA Dec Mag Err USNO_B10 R2 Class* Sigma excess\n -- --- --- --- -------- -- ----- -----\n05 19 56.874 +25 29 43.69 18.00 0.13 1154-0071628 19.15 G 4.07\n05 20 17.951 +25 33 08.34 18.63 0.12 1155-0072251 19.47 G 3.03\n\n\n*\nG -- Galaxy\n\nAccording to our classifier based on PS1 colours, source FWHM, and SIMBAD query.\n\nThe photometry performed against nearby USNO-B1.0 stars (R2 magnitude).\nThe limiting magnitude (3sigma) is R!.5.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35787.",
"published": "2024-02-24T13:32:53.295066Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-24T13:32:53.295107Z",
"modified": "2024-02-24T13:32:53.302791Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6081,
"topic": "gcn.circular",
"uuid": "24fde682-1a83-4d8e-959f-3acb37694c51",
"title": "VLA X-band observation of EPW20240219aa",
"submitter": "Hop gcn.circular",
"authors": "Anna Y Q Ho at Cornell University <ayh24@cornell.edu>",
"data": {
"date": "24/02/24 18:01:51 GMT",
"from": "Anna Y Q Ho at Cornell University <ayh24@cornell.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35788"
},
"title": "GCN CIRCULAR",
"number": "35788",
"subject": "VLA X-band observation of EPW20240219aa"
},
"message_text": "Anna Y. Q. Ho (Cornell), Antonio Rodriguez, Mansi Kasliwal, Shri Kulkarni (Caltech), Daniel Perley (LJMU) report:\n\nStarting at UT 2024 Feb 24 00:26 the Very Large Array (VLA) observed the position of EPW20240219aa, a fast X-ray transient discovered by Einstein Probe (ATel #16463; Yuan et al. 2018, Proc. SPIE, 10699, 1069925) subsequently recognized to have a GRB counterpart (ATel #16473, GCN #35773, 35776, 35784, 35785). The X-band (10 GHz) image RMS was 4 uJy in 34.5 minutes of on-source time.\n\nSeveral point sources were detected in the 3 arcmin radius localization region of EPW20240219aa, listed in the table below. Two (Source #6 and Source #7) have matches in ZTF deep reference r-band imaging. However, Source #7 has a match in Epoch 1.2 of the VLA Sky Survey (Lacy et al. 2020, PASP, 132, 035001) so is unlikely to be associated with EPW20240219aa.\n\nSource # | RA | Dec | Peak Flux Density (mJy)\n1 | 05:20:11.071 | 25:33:35.26 | 0.169\n2 | 05:20:11.950 | 25:32:05.73 | 0.082\n3 | 05:20:04.908 | 25:31:49.33 | 0.157\n4 | 05:20:05.888 | 25:31:20.67 | 0.038\n5 | 05:19:59.654 | 25:32:44.65 | 0.049\n6 | 05:20:04.705 | 25:33:27.30 | 0.030\n7 | 05:19:52.543 | 25:31:48.13 | 0.300\n\nA link to the ZTF r-band image with a VLA contour overlay can be found here: https://www.dropbox.com/scl/fi/0wk5pqm4nteyiarha6fme/overlayztf.pdf?rlkey=7o4dkhl0ml7ct8d16je67id88&dl=0\n\nA second VLA observation is planned to search for variability and identify any radio counterpart.\n\nData were obtained under DDT program VLA 24A-439 (PI Ho). We thank the VLA staff for rapidly approving and scheduling these observations.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35788.",
"published": "2024-02-24T18:02:09.399672Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-24T18:02:09.399698Z",
"modified": "2024-02-24T18:02:09.407258Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6082,
"topic": "gcn.circular",
"uuid": "6b6f1da5-24cc-430d-93b2-85db9d934133",
"title": "Swift-BAT triggers 1217218-1217222 are not astrophysical",
"submitter": "Hop gcn.circular",
"authors": "Simone Dichiara at Pennsylvania State University <sbd5667@psu.edu>",
"data": {
"date": "24/02/24 22:11:21 GMT",
"from": "Simone Dichiara at Pennsylvania State University <sbd5667@psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35789"
},
"title": "GCN CIRCULAR",
"number": "35789",
"subject": "Swift-BAT triggers 1217218-1217222 are not astrophysical"
},
"message_text": "S. Dichiara (PSU) reports on behalf of the Neil Gehrels Swift Observatory Team:\n\nSwift triggers 1217218, 1217221 and 1217222 were caused by a star track loss-of-lock event, and are not interesting astrophysical events.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35789.",
"published": "2024-02-24T22:11:38.660402Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-24T22:11:38.660423Z",
"modified": "2024-02-24T22:11:38.667294Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6083,
"topic": "gcn.circular",
"uuid": "cde62926-10ac-42ab-b857-7abb38029844",
"title": "Transient EPW20240219aa: 7DT Optical Upper Limits",
"submitter": "Hop gcn.circular",
"authors": "Gregory Paek at Seoul National University <gregorypaek94@gmail.com>",
"data": {
"date": "24/02/25 16:06:42 GMT",
"from": "Gregory Paek at Seoul National University <gregorypaek94@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35790"
},
"title": "GCN CIRCULAR",
"number": "35790",
"subject": "Transient EPW20240219aa: 7DT Optical Upper Limits"
},
"message_text": "Gregory S.H. Paek (SNU ARC/SNU), Myungshin Im (SNU ARC/SNU), Hyeonho Choi (SNU ARC/SNU), Seo-Won Chang (SNU ARC/SNU), and Ji Hoon Kim (SNU ARC/SNU) report on behalf of the 7-Dimensional Telescope collaboration\n\nWe searched for the optical counterpart of the bright X-ray flare, EPW20240219aa (Zhang et al., ATel #16463; Zhang et al., GCN #35773) using the 7-Dimensional Telescopes (7DT). Approximately 3.8 days following the initial detection (2024-02-19T06:23:27 UTC), we targeted the localization center provided by the Wide-field X-ray Telescope (WXT) modules aboard the Einstein Probe (EP) mission at RA, Dec = 80.016 deg, 25.541 deg with an uncertainty of 3 arcmin. Observations were made with nine 7DT units in medium-band filters, denoted as m400, m425, then through m825, in which the numeric values indicate their central wavelengths in nanometers. Each filter has a bandwidth of 25nm. In the preliminary result, no significant transient event was identified. Photometric flux calibration was performed using synthetic photometries derived from the Gaia DR3 XP catalog (Gaia Collaboration et al. 2022) within the AB magnitude system. Observations at low altitudes resulted in suboptimal conditions, potentially limiting our search sensitivity.\n------\nFilter Date-obs[UT] Exp.time[s] Depth(5sigma)\nm400 2024-02-23T01:42:11.629 900 18.166\nm425 2024-02-23T02:00:22.606 900 18.338\nm450 2024-02-23T01:42:53.577 900 18.330\nm475 2024-02-23T02:00:47.055 900 18.447\nm500 2024-02-23T01:42:28.304 900 18.597\nm525 2024-02-23T01:59:53.492 900 18.678\nm550 2024-02-23T01:48:38.922 900 18.379\nm575 2024-02-23T02:05:57.204 900 18.486\nm600 2024-02-23T01:44:36.663 900 17.712\nm625 2024-02-23T02:01:47.678 900 18.365\nm650 2024-02-23T01:43:27.232 900 18.110\nm675 2024-02-23T02:00:54.580 900 18.425\nm700 2024-02-23T01:43:15.587 900 17.894\nm725 2024-02-23T02:00:44.848 900 18.029\nm750 2024-02-23T01:43:56.489 900 17.154\nm775 2024-02-23T02:01:45.824 900 17.641\nm800 2024-02-23T01:47:43.573 900 17.177\nm825 2024-02-23T02:05:38.685 900 17.014\n\nThe 7-Dimensional Telescope (7DT), comprising 20 wide-field telescopes equipped with 40 medium-bandwidth (~25nm) filters located in Chile, aims to detect optical counterparts of GW sources and conduct the 7-Dimensional Sky Survey (7DS) of the Southern Hemisphere. Further information about the 7DT is available at http://gwuniverse.snu.ac.kr/.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35790.",
"published": "2024-02-25T16:07:01.548004Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-25T16:07:01.548030Z",
"modified": "2024-02-25T16:07:01.556436Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6084,
"topic": "gcn.circular",
"uuid": "2861a19e-246a-4b75-9e60-5eb47ece9433",
"title": "Transient EPW20240219aa: GECKO: LOAO Optical Upper Limits",
"submitter": "Hop gcn.circular",
"authors": "Gregory Paek at Seoul National University <gregorypaek94@gmail.com>",
"data": {
"date": "24/02/25 16:11:06 GMT",
"from": "Gregory Paek at Seoul National University <gregorypaek94@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35791"
},
"title": "GCN CIRCULAR",
"number": "35791",
"subject": "Transient EPW20240219aa: GECKO: LOAO Optical Upper Limits"
},
"message_text": "Gregory S.H. Paek (SNU ARC/SNU), Myungshin Im (SNU ARC/SNU), Chung-Uk Lee (KASI), Seung-Lee Kim (KASI), Hyun-Il Sung (KASI) on behalf of a larger collaboration\n\nWe searched for the optical counterpart of the bright X-ray flare, EPW20240219aa (Zhang et al., ATel #16463; Zhang et al., GCN #35773) with the 1-m class telescope in Lemonsan Optical Astronomy Observatory (LOAO), one of the facilities of the GW EM-Counterpart Korean Observatory (GECKO).\n\nWe observed the localization center provided by the Wide-field X-ray Telescope (WXT) modules aboard the Einstein Probe (EP) mission at RA, Dec = 80.016 deg, 25.541 deg, but could not find any transient within the field of view of LOAO (28.1'x28.1'). We calibrated flux with the PS1 catalog and used an AB magnitude system.\n\n------\nFilter Date-obs[UT] Exp.time[s] Depth(5sigma)\nR 2024-02-23T02:46:34 60*30 20.562\n\nWe thank the LOAO operator for performing the observation. Gravitational-wave Electromagnetic-wave Counterpart Korean Observatory (GECKO) is a network of 10+ 0.5m to 1m class telescopes over the world.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35791.",
"published": "2024-02-25T16:11:14.386695Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-25T16:11:14.386730Z",
"modified": "2024-02-25T16:11:14.393225Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6085,
"topic": "gcn.circular",
"uuid": "de7edaae-6ad7-4d6a-a12a-85576a19f9e7",
"title": "GRB 240222A: GRBAlpha detection",
"submitter": "Hop gcn.circular",
"authors": "Andras Pal at Konkoly Observatory <apal@szofi.net>",
"data": {
"date": "24/02/25 20:00:12 GMT",
"from": "Andras Pal at Konkoly Observatory <apal@szofi.net>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35792"
},
"title": "GCN CIRCULAR",
"number": "35792",
"subject": "GRB 240222A: GRBAlpha detection"
},
"message_text": "A. Pal (Konkoly Observatory), M. Dafcikova, J. Ripa, M. Kolar, N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, 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 240222A (Fermi/GBM detection: GCN 35769; Swift/BAT detection: GCN 35770; GECAM-B detection: GCN 35782; INTEGRAL/SPI-ACS peak detection at 2024-02-22 ~08:51:32 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 2024-02-22 08:51:31 UTC. The T90 duration measured by GRBAlpha is 1.5 s and the overall significance during T90 reaches 6.3 sigma.\n\nThe light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB240222A_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/35792.",
"published": "2024-02-25T20:00:25.512570Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-25T20:00:25.512621Z",
"modified": "2024-02-25T20:00:25.525020Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6086,
"topic": "gcn.circular",
"uuid": "95388370-f932-435e-ba0d-9cfbaa99fbd9",
"title": "GRB 240225A: Swift/BAT-GUANO detection of a short burst",
"submitter": "Hop gcn.circular",
"authors": "Jimmy DeLaunay at Penn State <delauj2@gmail.com>",
"data": {
"date": "24/02/25 23:15:07 GMT",
"from": "Jimmy DeLaunay at Penn State <delauj2@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35793"
},
"title": "GCN CIRCULAR",
"number": "35793",
"subject": "GRB 240225A: Swift/BAT-GUANO detection of a short 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 240225A onboard (T0: 2024-02-25T04:20:16.59 UTC, INTEGRAL SPI-ACS trigger 10589).\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 9.0 in a 1.024 s analysis time bin, starting at T0 + 1.28 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 6.5.\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/35793.",
"published": "2024-02-25T23:15:22.561526Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-25T23:15:22.561568Z",
"modified": "2024-02-25T23:15:22.570711Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6087,
"topic": "gcn.circular",
"uuid": "3d19a751-88ba-40c6-afc1-18b8e9889262",
"title": "GRB 240218A: VLA detection",
"submitter": "Hop gcn.circular",
"authors": "Genevieve Schroeder at Northwestern University <genevieveschroeder@u.northwestern.edu>",
"data": {
"date": "24/02/26 01:13:49 GMT",
"from": "Genevieve Schroeder at Northwestern University <genevieveschroeder@u.northwestern.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35794"
},
"title": "GCN CIRCULAR",
"number": "35794",
"subject": "GRB 240218A: VLA detection"
},
"message_text": "G. Schroeder (Northwestern), C. Peña, T. Laskar (Utah), K. D. Alexander (Arizona) report:\n\n\"We observed GRB 240218A (Page et al., GCN 35742; Veres et al., GCN 35755; Svinkin et al., GCN 35758) with the Karl G. Jansky Very Large Array (VLA) under program 24A-299 (PI: Laskar) beginning on 2024 Feb 23 at 09:38:35 UT (5.32 days post-burst) for 2.5 hours at multiple frequencies.\n\nIn preliminary analysis, we clearly detect a radio source at a mean frequency of 9.8 GHz with a flux density of ~280 microJy at the position:\n\nRA(J2000) = 10:47:11.480\nDec(J2000) = +01:16:35.29\n\nwith an uncertainty of ~0.2\" in each coordinate. This position is consistent with the X-ray position (Evans et al. GCN 35748) but offset (~2.7\") from the preliminary NIR afterglow position reported by D'Avanzo et al. (GCN 35747). Further observations are planned.\n\nWe thank the VLA staff for scheduling and executing these observations.\"\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35794.",
"published": "2024-02-26T01:14:07.029819Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-26T01:14:07.029840Z",
"modified": "2024-02-26T01:14:07.037767Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6088,
"topic": "gcn.circular",
"uuid": "c04d92f3-475e-4c4e-8eeb-936a793a702a",
"title": "Transient EPW20240219aa: Xinglong-2.16m optical upper limit",
"submitter": "Hop gcn.circular",
"authors": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
"data": {
"date": "24/02/26 01:26:37 GMT",
"from": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35795"
},
"title": "GCN CIRCULAR",
"number": "35795",
"subject": "Transient EPW20240219aa: Xinglong-2.16m optical upper limit"
},
"message_text": "Dong Xu, Junjie Jin, Min He, Zhou Fan, Zipei Zhu, Shuaiqing Jiang, Shaoyu Fu, Xing Liu, Jie An, Tianhua Lu, Feng Xiao, Yinan Zhu, Jie Zheng (NAOC) report on behalf of a large collaboration:\n\nWe observed the field of the X-ray transient and likely gamma-ray burst EPW20240219aa detected by EP (Zhang et al., ATel 16463; Zhang, ATel 16472), Fermi (Zhang et al., GCN 35773; Fletcher et al., GCN 35776), Swift (DeLaunay et al., GCN 35784), and Insight-HXMT (Cai et al., GCN 35785), using the 2.16-m telescope located at Xinglong, Hebei, China. We obtained 9 x 200 s frames in R-band, starting at 13:59:48 UT on 2024-02-22, i.e., 3.33 days after the EP trigger.\n\nNo new optical transient is identified within the EP/WXT error circle (Zhang et al., ATel 16463) down to a limiting magnitude of R ~ 21.3 mag (AB), using either cross-math or image subtraction against the PanSTAR survey of this field.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35795.",
"published": "2024-02-26T01:26:51.928436Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-26T01:26:51.928455Z",
"modified": "2024-02-26T01:26:51.934641Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6089,
"topic": "gcn.circular",
"uuid": "fbe9bb2e-4a1c-4981-bf25-7a34c45cb289",
"title": "GRB 240225B: MAXI/GSC detection",
"submitter": "Hop gcn.circular",
"authors": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"data": {
"date": "24/02/26 03:37:58 GMT",
"from": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35796"
},
"title": "GCN CIRCULAR",
"number": "35796",
"subject": "GRB 240225B: MAXI/GSC detection"
},
"message_text": "M. Nakajima, H. Negoro (Nihon U.), Y. Kawakubo (LSU),\nK. Kobayashi, M. Tanaka, Y. Soejima, Y. Kudo (Nihon U.),\nT. Mihara, T. Kawamuro, S. Yamada, S. Wang, T. Tamagawa, N. Kawai, M. Matsuoka (RIKEN),\nT. Sakamoto, M. Serino, S. Sugita, H. Hiramatsu, H. Nishikawa, A. Yoshida (AGU),\nY. Tsuboi, S. Urabe, S. Nawa, N. Nemoto, E.Goto (Chuo U.),\nM. Shidatsu (Ehime U.),\nI. Takahashi, M. Niwano, S. Sato, N. Higuchi, Y. Yatsu (Tokyo Tech),\nS. Nakahira, S. Ueno, H. Tomida, M. Ishikawa, S. Ogawa, T. Kurihara (JAXA),\nY. Ueda, K. Setoguchi, T. Yoshitake, Y. Nakatani, Y. Okada (Kyoto U.),\nM. Yamauchi, Y. Hagiwara, Y. Umeki, Y. Otsuki (Miyazaki U.),\nK. Yamaoka (Nagoya U.),\nM. Sugizaki (NAOC),\nW. Iwakiri (Chiba U.)\nreport on behalf of the MAXI team:\n\nThe MAXI/GSC nova alert system triggered a bright uncatalogued X-ray transient source\nat 20:15:46 UT on February 25, 2024.\nAssuming that the source flux was constant over the transit,\nwe obtain the source position at\n(R.A., Dec) = (128.458 deg, 27.487 deg) = (08 33 49, +27 29 13) (J2000)\nwith a statistical 90% C.L. elliptical error region\nwith long and short radii of 0.13 deg and 0.11 deg, respectively.\nThe roll angle of long axis from the north direction is 67.0 deg counterclockwise.\nThere is an additional systematic uncertainty of 0.1 deg (90% containment radius).\nThe X-ray flux averaged over the scan was 874 +- 86 mCrab\n(4.0-10.0keV, 1 sigma error).\nWithout assumptions on the source constancy, we obtain a rectangular error\nbox for the transient source with the following corners:\n(R.A., Dec) = (127.906, 26.756) deg = (08 31 37, +26 45 21) (J2000)\n(R.A., Dec) = (128.157, 26.654) deg = (08 32 37, +26 39 14) (J2000)\n(R.A., Dec) = (128.895, 28.075) deg = (08 35 34, +28 04 29) (J2000)\n(R.A., Dec) = (128.642, 28.179) deg = (08 34 34, +28 10 44) (J2000)\nThere was no significant excess flux in the previous transit at 18:43 UT\nand in the next transit at 21:48 UT with an upper limit of 20 mCrab for each.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35796.",
"published": "2024-02-26T03:38:17.039396Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-26T03:38:17.039418Z",
"modified": "2024-02-26T03:38:17.047142Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6090,
"topic": "gcn.circular",
"uuid": "d3c987be-589a-4aeb-a35f-a060e29b934d",
"title": "GRB 240225B: Tiled Swift observations",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/02/26 04:13:59 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35797"
},
"title": "GCN CIRCULAR",
"number": "35797",
"subject": "GRB 240225B: Tiled Swift observations"
},
"message_text": "\nP. A. Evans (U. Leicester) reports on behalf of the Swift team:\n\nSwift has initiated a series of observations, tiled on the sky, of the\nMAXI GRB 240225B. Automated analysis of the XRT data will\nbe presented online at http://www.swift.ac.uk/xrt_products/TILED_GRB00124\n\nAny uncatalogued X-ray sources detected in this analysis will be\nreported on this website and via GCN COUNTERPART notices. The probability of finding\nserendipitous sources, unrelated to the MAXI event is high: any X-ray source\nconsidered to be a probable afterglow candidate will be reported via a GCN Circular\nafter manual consideration.\n\nDetails of the XRT automated analysis methods are detailed in Evans et\nal. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).\n\nThis circular is an official product of the Swift-XRT team.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35797.",
"published": "2024-02-26T04:14:13.974685Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-26T04:14:13.974707Z",
"modified": "2024-02-26T04:14:13.982384Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6617,
"topic": "gcn.circular",
"uuid": "f939af14-4563-4f91-a35b-2155f0e61647",
"title": "EP240413a: BOOTES-2/TELMA Optical Upper Limit",
"submitter": "Hop gcn.circular",
"authors": "Dingrong Xiong at Yunnan Observatories of CAS, China <xiongdingrong@ynao.ac.cn>",
"data": {
"date": "24/04/16 13:10:33 GMT",
"from": "Dingrong Xiong at Yunnan Observatories of CAS, China <xiongdingrong@ynao.ac.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36135"
},
"title": "GCN CIRCULAR",
"number": "36135",
"subject": "EP240413a: BOOTES-2/TELMA Optical Upper Limit"
},
"message_text": "D. R. Xiong, J. M. Bai, J. R. Mao, Y. F. Fan, K. Ye, C. J. Wang, Y. X. Xin, B. L. Lun, J. J. Zhang, X. H. Zhao, L. Xu, K. X. Lu, X. Ding, D. Q. Wang, S. S. He(Yunnan Observatories/CAS), A. J. Castro-Tirado, E. Fernandez-Garcia, Y. D. Hu (IAA-CSIC) and C. J. Perez del Pulgar (UMA) on behalf of the BOOTES team report:\n\nWe observed the fast X-ray transient EP240413a (R.A. = 228.815 deg, DEC = -18.503 deg; Lian et al., GCN 36086, Li et al., GCN 36092) with BOOTES-2/TELMA robotic telescope, and did not found any optical counterpart within an uncertainty of 30 arcsec in radius.\n\nThe upper limits of magnitudes (without being corrected for Galactic extinction) are given as follows.\n\nFXT T0 | Tmid-T0 (day) | UT (start) | Upper Limit (error) | Exposure Time | Filter\n\n--------------------------------------------------------------------------------------------------------------\n\n24-04-14T04:40:26| 0.86 | 04-15T01:21:09 | 17.623 (0.13) | 10*60s (co-added) | Clear\n\n---------------------------------------------------------------------------------------------------------------\n\nThe Burst Optical Observer and Transient Exploring System (BOOTES) is a world-wide automatic telescope network which aims to repaid follow-up of transient and astrophysical sources in the sky for which the first station was installed in 1998 (Castro-Tirado et al. 1999; Hu et al. 2021). The BOOTES-2/TELMA robotic telescope at IHSM La Mayora (UMA-CSIC) in Algarrobo Costa (Malaga, Spain). We acknowledge the support of these staffs from the BOOTES telescope networks.\n\n=================================================================\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36135.",
"published": "2024-04-16T13:10:50.016946Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-16T13:10:50.016962Z",
"modified": "2024-04-16T13:10:50.024678Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6091,
"topic": "gcn.circular",
"uuid": "b3146f0e-ab1a-4b65-b753-1b9b4db95e5f",
"title": "GRB 240225B: AstroSat CZTI detection",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar24@gmail.com>",
"data": {
"date": "24/02/26 09:04:31 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar24@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35798"
},
"title": "GCN CIRCULAR",
"number": "35798",
"subject": "GRB 240225B: AstroSat CZTI detection"
},
"message_text": "J. Joshi (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 240225B which was also detected by MAXI/GSC (M. Nakajima et al., GCN Circ. 35796). Inspection of INTEGRAL/SPI-ACS data also showed the detection of the burst. We note that the INTEGRAL/SPI-ACS detection time is consistent with our time which is about 3 min offset from the time reported in the MAXI/GSC detection (GCN 35796).\n\nThe source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2024-02-25 20:12:08.50 UTC. The measured peak count rate associated with the burst is 185 (+40, -22) counts/s above the background in the combined data of all quadrants, with a total of 1617 (+331, -224) counts. The local mean background count rate was 346 (+1, -5) counts/s. Using cumulative rates, we measure a T90 of 19 (+10, -5) s.\n\nThe source was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2024-02-25 20:12:01.80 UTC. The measured peak count rate associated with the burst is 570 (+72, -69) counts/s above the background in the combined data of all quadrants, with a total of 5119 (+490, -666) counts. The local mean background count rate was 1539 (+7, -6) counts/s. We measure a T90 of 23 (+3, -4) 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/35798.",
"published": "2024-02-26T09:04:49.228290Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-26T09:04:49.228335Z",
"modified": "2024-02-26T09:04:49.239097Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6092,
"topic": "gcn.circular",
"uuid": "0e8a7a3a-6be3-43a4-b31c-28a448827792",
"title": "GRB 240225C: AstroSat CZTI detection",
"submitter": "Hop gcn.circular",
"authors": "Gaurav Waratkar at IIT Bombay <gauravwaratkar24@gmail.com>",
"data": {
"date": "24/02/26 09:10:37 GMT",
"from": "Gaurav Waratkar at IIT Bombay <gauravwaratkar24@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35799"
},
"title": "GCN CIRCULAR",
"number": "35799",
"subject": "GRB 240225C: AstroSat CZTI detection"
},
"message_text": "J. Joshi (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 240225C which was also detected by Calet (Trigger Num. 1392873321), INTEGRAL/SPI-ACS (Trigger Num. 10590), and Konus-WIND (IPN RAW notices).\n\nThe source was detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2024-02-25 05:19:38.80 UTC. The measured peak count rate associated with the burst is 289 (+71, -45) counts/s above the background in the combined data of all quadrants, with a total of 1297 (+320, -349) counts. The local mean background count rate was 1387 (+7, -7) counts/s. We measure a T90 of 6.7 (+2.6, -1.6) s from the cumulative Veto light curve.\n\nCZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.\n\nCZTI GRB detections are reported regularly on the payload site at:\nhttp://astrosat.iucaa.in/czti/?q=grb\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35799.",
"published": "2024-02-26T09:10:48.207806Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-26T09:10:48.207826Z",
"modified": "2024-02-26T09:10:48.214187Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6093,
"topic": "gcn.circular",
"uuid": "8339418a-9169-4100-afed-162d090713e8",
"title": "Fermi trigger No 730618809: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "24/02/26 16:15:44 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35800"
},
"title": "GCN CIRCULAR",
"number": "35800",
"subject": "Fermi trigger No 730618809: 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 GRB240226.24 (trigger No 730618809,02h 52m 02.40s , -31d 12m 36.0s, R=7.65) errorbox 36154 sec after notice time and 36188 sec after trigger time at 2024-02-26 15:43:12 UT, with upper limit up to 17.5 mag. Observations started at twilight. The observations began at zenith distance = 79 deg. The sun altitude is -9.6 deg.\n\nThe galactic latitude b = -63 deg., longitude l = 229 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#86378\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 36218 | 2024-02-26 15:43:12 | MASTER-Kislovodsk | (02h 58m 26.68s , -31d 01m 44.4s) | C | 60 | 13.9 |\n 36218 | 2024-02-26 15:43:12 | MASTER-Kislovodsk | (02h 54m 06.89s , -30d 41m 25.8s) | C | 60 | 14.8 |\n 36298 | 2024-02-26 15:44:32 | MASTER-Kislovodsk | (02h 55m 07.43s , -29d 08m 44.3s) | C | 60 | 14.7 |\n 36298 | 2024-02-26 15:44:32 | MASTER-Kislovodsk | (02h 50m 52.02s , -28d 48m 23.5s) | C | 60 | 15.1 |\n 36378 | 2024-02-26 15:45:53 | MASTER-Kislovodsk | (02h 37m 39.69s , -29d 10m 12.7s) | C | 60 | 14.4 |\n 36378 | 2024-02-26 15:45:53 | MASTER-Kislovodsk | (02h 33m 24.60s , -28d 49m 54.8s) | C | 60 | 14.7 |\n 36459 | 2024-02-26 15:47:13 | MASTER-Kislovodsk | (02h 52m 01.56s , -27d 15m 24.6s) | C | 60 | 14.7 |\n 36459 | 2024-02-26 15:47:13 | MASTER-Kislovodsk | (02h 47m 48.96s , -26d 55m 02.6s) | C | 60 | 14.8 |\n 36539 | 2024-02-26 15:48:33 | MASTER-Kislovodsk | (03h 12m 28.66s , -29d 07m 38.0s) | C | 60 | 14.8 |\n 36539 | 2024-02-26 15:48:33 | MASTER-Kislovodsk | (03h 08m 11.71s , -28d 47m 15.0s) | C | 60 | 14.4 |\n 36620 | 2024-02-26 15:49:54 | MASTER-Kislovodsk | (03h 16m 14.04s , -31d 03m 27.6s) | C | 60 | 14.7 |\n 36620 | 2024-02-26 15:49:54 | MASTER-Kislovodsk | (03h 11m 52.95s , -30d 43m 05.0s) | C | 60 | 14.6 |\n 36700 | 2024-02-26 15:51:14 | MASTER-Kislovodsk | (02h 34m 58.36s , -27d 14m 41.8s) | C | 60 | 13.8 |\n 36700 | 2024-02-26 15:51:14 | MASTER-Kislovodsk | (02h 30m 46.46s , -26d 54m 23.0s) | C | 60 | 14.0 |\n 36780 | 2024-02-26 15:52:34 | MASTER-Kislovodsk | (03h 09m 02.22s , -27d 14m 39.7s) | C | 60 | 14.6 |\n 36780 | 2024-02-26 15:52:34 | MASTER-Kislovodsk | (03h 04m 49.01s , -26d 54m 16.6s) | C | 60 | 14.4 |\n 36860 | 2024-02-26 15:53:54 | MASTER-Kislovodsk | (02h 49m 13.08s , -25d 21m 04.1s) | C | 60 | 15.1 |\n 36860 | 2024-02-26 15:53:54 | MASTER-Kislovodsk | (02h 45m 03.73s , -25d 00m 41.9s) | C | 60 | 15.1 |\n 36940 | 2024-02-26 15:55:14 | MASTER-Kislovodsk | (03h 05m 55.68s , -25d 21m 45.8s) | C | 60 | 15.5 |\n 36940 | 2024-02-26 15:55:14 | MASTER-Kislovodsk | (03h 01m 45.70s , -25d 01m 21.9s) | C | 60 | 15.7 |\n 37020 | 2024-02-26 15:56:35 | MASTER-Kislovodsk | (02h 32m 25.83s , -25d 22m 03.6s) | C | 60 | 16.1 |\n 37021 | 2024-02-26 15:56:35 | MASTER-Kislovodsk | (02h 28m 17.38s , -25d 01m 44.2s) | C | 60 | 16.3 |\n 37101 | 2024-02-26 15:57:55 | MASTER-Kislovodsk | (02h 46m 37.54s , -23d 26m 36.0s) | C | 60 | 15.5 |\n 37101 | 2024-02-26 15:57:55 | MASTER-Kislovodsk | (02h 42m 31.16s , -23d 06m 12.6s) | C | 60 | 15.1 |\n 37181 | 2024-02-26 15:59:15 | MASTER-Kislovodsk | (03h 26m 09.15s , -27d 15m 27.4s) | C | 60 | 17.1 |\n 37181 | 2024-02-26 15:59:15 | MASTER-Kislovodsk | (03h 21m 55.52s , -26d 55m 02.1s) | C | 60 | 17.5 |\nFilter C is a clear (unfiltred) band.\n\n\nThe observation and reduction will continue.\nThe message may be cited.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35800.",
"published": "2024-02-26T16:16:00.806179Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-26T16:16:00.806206Z",
"modified": "2024-02-26T16:16:00.814302Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6105,
"topic": "gcn.circular",
"uuid": "4efc45c8-1789-4ea5-adba-07e9d185bb59",
"title": "GRB 240225B: Nanshan/HMT optical afterglow detection",
"submitter": "Hop gcn.circular",
"authors": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
"data": {
"date": "24/02/26 23:18:55 GMT",
"from": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35812"
},
"title": "GCN CIRCULAR",
"number": "35812",
"subject": "GRB 240225B: Nanshan/HMT optical afterglow detection"
},
"message_text": "X. Liu,, J. An, S.Y. Fu, S.Q. Jiang, 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 240225B detected by MAXI (Nakajima et al., GCN 35796) and AstroSat (Joshi et al., GCN 35798) using the HMT-0.5m telescope with big FOV (~1 deg^2) located at Nanshan, Xinjiang, China. Photometry was carried out twice in the same night without any filter..\n\nA slowly decaying uncatalogued optical transient is detected at coordinates\n\nR.A. = 08:33:26.80 (J2000)\nDec. = +27:04:32.77 (J2000)\n\nwith an uncertainty of radius ~ 0.3 arcsec, with r ~ 18.9 +/- 0.1 mag (AB) at a median time of 18.90 hr post-burst, calibrated with the nearby PanSTAR field. This OT is positionally at the border of the error circle of Swift/XRT \"Source 1\" (D'Ai et al., GCN 35810), and is also consistent with and thus confirming the GOTO candidate (Gompertz et al., GCN 35805).\n\nWe thus think the OT is the optical afterglow of GRB 240225B.\n\n\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35812.",
"published": "2024-02-26T23:19:13.531829Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-26T23:19:13.531865Z",
"modified": "2024-02-26T23:19:13.539453Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6094,
"topic": "gcn.circular",
"uuid": "43235965-2e86-42fd-a33b-a42254340964",
"title": "GRB 240222A: ATCA radio observations",
"submitter": "Hop gcn.circular",
"authors": "jamesk.leung@utoronto.ca",
"data": {
"date": "24/02/26 17:22:04 GMT",
"from": "jamesk.leung@utoronto.ca",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35801"
},
"title": "GCN CIRCULAR",
"number": "35801",
"subject": "GRB 240222A: ATCA radio observations"
},
"message_text": "J. K. Leung (U. Toronto/HUJI), G. E. Anderson (Curtin University),\nS. Chastain (UNM), A. Gulati (U. Sydney), L. Rhodes (U. Oxford),\nA. J. van der Horst (GWU) on behalf of the PanRadio GRB collaboration\n\nThe Australia Telescope Compact Array (ATCA) performed observations\nof GRB 240222A (Fermi GBM Team, GCN 35769; D'Avanzo et al., GCN 35770)\nat 5.5, 9, 16.7 and 21.2 GHz as part of the Large ATCA \"PanRadio GRB\"\nfollow-up programme C3542 (PI. Anderson). ATCA observed from\n2024-02-24 12:00 UT to 22:00 UT. In our preliminary analysis, we find\nno radio source coincident with the refined XRT position (Beardmore\net al., GCN 35780) with 3 sigma upper limits of 75, 54, 69 and 159\nmicroJy/beam at 5.5, 9.0, 16.7 and 21.2 GHz, respectively.\n\nWe thank the CSIRO Space and Astronomy staff for supporting these\nobservations. We acknowledge the Gomeroi people as the traditional\nowners of the Observatory site. The Australia Telescope Compact Array is\npart of the Australia Telescope National Facility\n(https://ror.org/05qajvd42) which is funded by the Australian Government\nfor operation as a National Facility managed by CSIRO.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35801.",
"published": "2024-02-26T17:22:21.027001Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-26T17:22:21.027022Z",
"modified": "2024-02-26T17:22:21.034184Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6095,
"topic": "gcn.circular",
"uuid": "c289b1c3-bb7d-4326-a673-b082e3dae7b6",
"title": "GRB 240225C: GRBAlpha detection",
"submitter": "Hop gcn.circular",
"authors": "Jakub Ripa <ripa.jakub@gmail.com>",
"data": {
"date": "24/02/26 18:27:13 GMT",
"from": "Jakub Ripa <ripa.jakub@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35802"
},
"title": "GCN CIRCULAR",
"number": "35802",
"subject": "GRB 240225C: 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, 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 240225C (AstroSat detection: GCN 35799; CALET/CGBM detection: trigger no. 1392873321; INTEGRAL/SPI-ACS detection: trigger no. 10590) 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 2024-02-25 05:19:36.5 UTC. The T90 duration measured by GRBAlpha is 8.5 s and the overall significance during T90 reaches 5.5 sigma.\n\nThe light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB240225C_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/35802.",
"published": "2024-02-26T18:27:31.296672Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-26T18:27:31.296695Z",
"modified": "2024-02-26T18:27:31.305588Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6096,
"topic": "gcn.circular",
"uuid": "85d9d408-929e-42ad-8ef6-510d5b45d1a5",
"title": "Transient EPW20240219aa: REM optical/NIR upper limits",
"submitter": "Hop gcn.circular",
"authors": "Matteo Ferro <matteo.ferro@inaf.it>",
"data": {
"date": "24/02/26 19:27:31 GMT",
"from": "Matteo Ferro <matteo.ferro@inaf.it>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35803"
},
"title": "GCN CIRCULAR",
"number": "35803",
"subject": "Transient EPW20240219aa: REM optical/NIR upper limits"
},
"message_text": "M. Ferro, R. Brivio, Y.-D. Hu, P. DâAvanzo, S. Covino, D. Fugazza (INAF-OAB) on behalf of the REM team, report:\n\nWe observed the field of the transient EPW20240219aa (Zhang et al., ATel 16463; Zhang et al., ATel 16472; Zhang et al., GCN 35773) with the REM 60cm robotic telescope located at the ESO observatory of La Silla (Chile). The observations were carried in the g, r, i, z, H bands, starting on 2024 February 25 at 00:16:54 UT (i.e. 5.75 days after the event), and lasting for about 20 minutes. \nWe find no clear afterglow candidate within the Einstein Probe error circle, nor at the positions of the radio sources reported by Ho et al. (GCN 35788), down to the following 3sigma magnitude upper limits:\n\nH > 17.3 (Vega; calibrated against the 2MASS catalogue)\n\nr > 19.9 (AB; calibrated against the Pan-STARRS catalogue)\n\nat the common mid-time of t - t0 = 5.75 days after the EP trigger.\n\nWe report a detection of VLA sources #6 and #7 in the co-added REM H-band image with magnitudes H ~ 16.7 and H ~ 16.5, respectively (AB). We note however that both sources are reported in the UKIDSS survey with similar magnitudes.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35803.",
"published": "2024-02-26T19:27:49.602225Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-26T19:27:49.602248Z",
"modified": "2024-02-26T19:27:49.609477Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6097,
"topic": "gcn.circular",
"uuid": "e15e626b-e7b1-4e54-b7c5-36f4a6455753",
"title": "GRB 240226A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "24/02/26 19:43:46 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35804"
},
"title": "GCN CIRCULAR",
"number": "35804",
"subject": "GRB 240226A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 19:33:07 UT on 26 Feb 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240226A (trigger 730668792.323378 / 240226815).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 289.1, Dec = -43.1 (J2000 degrees, equivalent to J2000 19h 16m, -43d 06'), with a statistical uncertainty of 9.0 degrees.\n\nThe angle from the Fermi LAT boresight is 30.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240226815/quicklook/glg_skymap_all_bn240226815.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240226815/quicklook/glg_healpix_all_bn240226815.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240226815/quicklook/glg_lc_medres34_bn240226815.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35804.",
"published": "2024-02-26T19:44:03.039807Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-26T19:44:03.039845Z",
"modified": "2024-02-26T19:44:03.046529Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6098,
"topic": "gcn.circular",
"uuid": "a155ed9d-e691-4bce-a6c3-9a2a8fac0b33",
"title": "GRB 240225B: GOTO detection of a candidate optical afterglow",
"submitter": "Hop gcn.circular",
"authors": "Ben Gompertz at U of Birmingham <b.gompertz@bham.ac.uk>",
"data": {
"date": "24/02/26 20:45:40 GMT",
"from": "Ben Gompertz at U of Birmingham <b.gompertz@bham.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35805"
},
"title": "GCN CIRCULAR",
"number": "35805",
"subject": "GRB 240225B: GOTO detection of a candidate optical afterglow"
},
"message_text": "B. P. Gompertz, R. L. C. Starling, M. Kennedy, G. Ramsay, D. B. Malesani, B. Godson, K. Ackley, M. J. Dyer, J. Lyman, K. Ulaczyk, F. Jimenez-Ibarra, A. Kumar, D. O'Neill, D. Steeghs, D. K. Galloway, V. Dhillon, P. O'Brien, K. Noysena, R. Kotak, R. P. Breton, L. K. Nuttall, E. Pall'e and D. Pollacco report on behalf of the GOTO collaboration:\n\nWe report on observations of the MAXI-discovered GRB 240225B (Nakajima et al, GCN 35796) with the Gravitational-wave Optical Transient Observer (GOTO, Steeghs et al. 2022). GOTO-North serendipitously tiled the MAXI localisation at 21:45:51 UT on 2024-02-25, 1.5 hours after trigger. The observation consisted of 4x45 s exposures in the GOTO L-band (400-700 nm).\n\nImages were processed immediately after acquisition using the GOTO pipeline. Difference imaging was performed using recent survey observations of the same pointings. Source candidates were initially filtered using a classifier (Killestein et al. 2021) and cross-matched against a variety of contextual and minor planet catalogues. Human vetting was carried out in real time on any candidates that passed the above checks.\n\nWe identify a new optical source (GOTO24tz/AT2024dgu) with a magnitude of L = 17.12 +/- 0.04 at RA 08:33:26.67, Dec +27:04:32.71 (J2000). The optical source is close to the probable X-ray afterglow identified in tiled Swift observations (Evans, GCN 35797), offset by 7.2â, whilst formally outside the 4.4â 90% confidence contour of the X-ray localisation. This source was not present in the previous GOTO epoch, taken one day prior at 22:05:36 UT on 2024-02-24, to a limiting magnitude of L > 18.7. Given the tight pre-burst limit and close proximity with a new X-ray source, we propose this as a strong candidate afterglow of GRB 240225B.\n\nMagnitudes were calibrated using ATLAS-REFCAT2 (Tonry et al. 2018) and are not corrected for Galactic extinction.\n\nGOTO (https://goto-observatory.org) is a network of telescopes that is principally funded by the STFC and operated at the Roque de los Muchachos Observatory on La Palma, Spain, and Siding Spring Observatory in NSW, Australia, on behalf of a consortium including the University of Warwick, Monash University, Armagh Observatory & Planetarium, the University of Leicester, the University of Sheffield, the National Astronomical Research Institute of Thailand (NARIT), the University of Turku, the University of Portsmouth, the University of Manchester and the Instituto de Astrofisica de Canarias (IAC).\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35805.",
"published": "2024-02-26T20:46:03.398358Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-26T20:46:03.398399Z",
"modified": "2024-02-26T20:46:03.405459Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6106,
"topic": "gcn.circular",
"uuid": "3d1d9890-e972-41d7-9f23-e8bae7d31692",
"title": "Fermi Gamma-ray Burst Monitor trigger 730618809/240226236 is not a GRB",
"submitter": "Hop gcn.circular",
"authors": "Lorenzo Scotton at UAH <lscottongcn@outlook.com>",
"data": {
"date": "24/02/27 00:17:45 GMT",
"from": "Lorenzo Scotton at UAH <lscottongcn@outlook.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35813"
},
"title": "GCN CIRCULAR",
"number": "35813",
"subject": "Fermi Gamma-ray Burst Monitor trigger 730618809/240226236 is not a GRB"
},
"message_text": "L. Scotton (UAH) reports on behalf of the Fermi Gamma-ray Burst Monitor Team:\n\n\"The Fermi Gamma-ray Burst Monitor (GBM) trigger 730618809/240226236 at 05:40:04.58 UT\non 26 February 2024 was initially classified as a GRB, and named GRB 240226B (GCN 35809).\nThis trigger is in fact not due to a GRB, but to a solar flare.\"\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35813.",
"published": "2024-02-27T00:18:01.091472Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-27T00:18:01.091506Z",
"modified": "2024-02-27T00:18:01.100793Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6099,
"topic": "gcn.circular",
"uuid": "e0f3288d-9d62-4961-8270-2de230f35ec1",
"title": "GRB 240225C: CALET Gamma-Ray Burst Monitor detection",
"submitter": "Hop gcn.circular",
"authors": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"data": {
"date": "24/02/26 20:51:06 GMT",
"from": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35806"
},
"title": "GCN CIRCULAR",
"number": "35806",
"subject": "GRB 240225C: CALET Gamma-Ray Burst Monitor detection"
},
"message_text": "S. Sugita , A. Yoshida, T. Sakamoto (AGU), Y. Kawakubo (LSU),\nK. Yamaoka (Nagoya U), S. Nakahira (JAXA),\nY. Asaoka (ICRR), S. Torii, Y. Akaike, K. Kobayashi (Waseda U),\nY. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC),\nM. L. Cherry (LSU), S. Ricciarini (U of Florence),\nP. S. Marrocchesi (U of Siena),\nand the CALET collaboration:\n\nThe long GRB 240225C (INTEGRAL SPI ACS Trigger: Trigger Num. 10590;\nIPN RAW NOTICE (KONUS/Wind); AstroSat CZTI detection: Joshi et al.,\nGCN Circ. 35799; GRBAlpha detection: Ripa et al., GCN Circ. 35802)\ntriggered the CALET Gamma-ray Burst Monitor (CGBM) at 05:19:32.73\nUTC on 25 February 2024\n(http://cgbm.calet.jp/cgbm_trigger/flight/1392873321/index.html).\nThe burst signal was seen by all CGBM detectors.\n\nThe burst light curve shows a single pulse that starts\nat T+2.6 sec, peaks at T+4.2 sec, and ends at T+22.6 sec.\nThe T90 and T50 durations measured by the SGM data are 13.1 +/- 3.4 sec\nand 4.6 +/- 0.4 sec (40-1000 keV), respectively.\n\nThe ground-processed light curve is available at\n\nhttp://cgbm.calet.jp/cgbm_trigger/ground/1392873321/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/35806.",
"published": "2024-02-26T20:51:21.203158Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-26T20:51:21.203179Z",
"modified": "2024-02-26T20:51:21.210541Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6100,
"topic": "gcn.circular",
"uuid": "d87e8318-efea-4302-8063-ee58cb0e9853",
"title": "Transient EPW20240219aa: J-band upper limits from WINTER",
"submitter": "Hop gcn.circular",
"authors": "Viraj Karambelkar at Indian Inst of Tech,Bombay <karambelkarvraj21197@gmail.com>",
"data": {
"date": "24/02/26 21:05:09 GMT",
"from": "Viraj Karambelkar at Indian Inst of Tech,Bombay <karambelkarvraj21197@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35807"
},
"title": "GCN CIRCULAR",
"number": "35807",
"subject": "Transient EPW20240219aa: J-band upper limits from WINTER"
},
"message_text": "Viraj Karambelkar (Caltech), Danielle Frostig (MIT), Robert Stein\n(Caltech), Nathan Lourie (MIT), Geoffrey Mo (MIT), Tomas Ahumada (Caltech),\nRobert Simcoe (MIT), Mansi Kasliwal (Caltech)\n\nWe observed the location of the X-ray flare EPW20240219aa (Zhang et al.,\nATel #16463; Zhang et al., GCN #35773) in the near-infrared J-band with the\nPalomar 1-m telescope, equipped with the 1 square degree WINTER camera\n(Lourie et al. 2020).\n\nOur observations started at UTC 2024-02-25T03:24:23, and covered the 3\narcmin localization region of the X-ray flare. The images were processed\nthrough the WINTER data reduction pipeline implemented using mirar (\nhttps://github.com/winter-telescope/mirar), with image subtraction\nperformed relative to reference images built from the UKIRT Galactic Plane\nSurvey (Lucas et al. 2008).\n\n\nNo new sources are detected to a depth of J = 18.5 mag (AB). Of the 7 radio\nsources detected by the VLA in this region (Ho et al. GCN #35788), source 6\nis detected in both the WINTER and archival UKIRT images, but does not show\nsignificant variability between the two epochs (consistent with that\nreported in Ferro et al. GCN #35803).\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35807.",
"published": "2024-02-26T21:05:22.170174Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-26T21:05:22.170195Z",
"modified": "2024-02-26T21:05:22.176979Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6115,
"topic": "gcn.circular",
"uuid": "f47ba3a2-540d-493e-9c32-677738157161",
"title": "Swift Trigger 1217799 is not a GRB",
"submitter": "Hop gcn.circular",
"authors": "Jamie Kennea at Penn State <jak51@psu.edu>",
"data": {
"date": "24/02/27 18:09:28 GMT",
"from": "Jamie Kennea at Penn State <jak51@psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35822"
},
"title": "GCN CIRCULAR",
"number": "35822",
"subject": "Swift Trigger 1217799 is not a GRB"
},
"message_text": "\nJ. A. Kennea (PSU) report on behalf of the Neil Gehrels Swift\nObservatory Team:\n\nSwift BAT Trigger 1217799 which occurred as 16:08:47UT on February 27, 2024\nis due to a star tracker loss-of-lock, and is not an astrophysical event.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35822.",
"published": "2024-02-27T18:09:47.317879Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-27T18:09:47.317905Z",
"modified": "2024-02-27T18:09:47.327032Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6116,
"topic": "gcn.circular",
"uuid": "27acbc7c-4bad-414e-ad2b-95116466c813",
"title": "Swift J1727.8-1613 (GRB 230824A): Madrona Peak Observatory - optical follow-up",
"submitter": "Hop gcn.circular",
"authors": "Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy - MPC Code C82 <osservatorionastroverde@gmail.com>",
"data": {
"date": "24/02/27 19:08:13 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/35823"
},
"title": "GCN CIRCULAR",
"number": "35823",
"subject": "Swift J1727.8-1613 (GRB 230824A): Madrona Peak Observatory - optical follow-up"
},
"message_text": "TITOLO: Swift J1727.8-1613 (GRB 230824A): Madrona Peak Observatory - optical follow-up\n\nNello 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)\nAAVSO - American Association of Variable Star Observers.\nUAI/SSV - Unione Astrofili Italiani/sezione stelle variabili.\nAstroCampania Associazione.\nreport:\n\nFollowing the Swift trigger no. 1186959 (GCN 34537), using the 24 Inch RC Optical Ritchey-Chretien Reflector telescope and the Apogee Aspen CG16M camera of the Madrona Peak Observatory connected to the AAVSONet network,\nwe obtained a series of B,V,R images of the transient approximately 6 months after the first detection.\nThe images were measured with the VPhot AAVSO software, using the APASS catalogue. The photometry obtained on 19/23/25 February 2024 are as follows:\n\nwith the following photometry:\n\n JD\t Mag\t Filter\n2460363.97895\t15.830 V\n2460363.97781\t15.987 V\n2460359.99249\t15.864 V\n2460359.99139\t15.837 V\n\n\n\n\nJD\t Mag\t Filter\n2460365.97083\t15.713 R\n2460363.98126\t15.552 R\n2460363.98014\t15.535 R\n2460359.99473\t15.530 R\n2460359.99362\t15.512 R\n\n\n\nJD\t Mag\t Filter\n2460363.97611\t15.230 B\n2460363.97427\t16.275 B\n2460359.98979\t16.096 B\n2460359.98799\t16.131 B\n\n\n\n\nThe magnitudes are calibrated with stars of the APASS catalog are not corrected for the expected Galactic extinction.\n\nThe message may be cited.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35823.",
"published": "2024-02-27T19:08:36.429858Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-27T19:08:36.429879Z",
"modified": "2024-02-27T19:08:36.437389Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6618,
"topic": "gcn.circular",
"uuid": "959c0056-4443-4fca-8f24-6f365a152e07",
"title": "GRB 240415A: Swift/UVOT Detection",
"submitter": "Hop gcn.circular",
"authors": "Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>",
"data": {
"date": "24/04/16 13:38:30 GMT",
"from": "Mike Siegel at PSU/Swift MOC <mhs18@psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36136"
},
"title": "GCN CIRCULAR",
"number": "36136",
"subject": "GRB 240415A: Swift/UVOT Detection"
},
"message_text": "M. H. Siegel (PSU) and M. J. Moss (GSFC)\nreport on behalf of the Swift/UVOT team:\n\nThe Swift/UVOT began settled observations of the field of GRB 240415A\n3309 s after the BAT trigger (Moss et al., GCN Circ. 36108). A source consistent\nwith the XRT position (Beardmore et al., GCN Circ. 36128) and the reported\noptical transient (Pankov et al., GCN Circ. 36118, Moskvitin et al., GCN Circ. 36122,\nReguitti et al., GCN Circ. 36123, Schneider et al., GCN Circ. 36124, Aryan et al.,\nGCN Circ. 36132) is detected in the initial UVOT exposures.\n\nPreliminary detections and 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:\n\nFilter T_start(s) T_stop(s) Exp(s) Mag\n\nwhite 3877 4077 197 19.92 +/- 0.19\nv 4287 4487 197 18.95 +/- 0.28\nb 3672 3872 197 >19.2\nu 3467 5040 332 18.96 +/- 0.18\nw1 4698 4897 197 >19.3\nm2 4492 4692 197 >19.1\nw2 4083 4282 197 >19.5\n\nThe magnitudes in the table are not corrected for the Galactic extinction\ndue to the reddening of E(B-V) = 0.022 in the direction of the burst\n(Schlegel et al. 1998).\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36136.",
"published": "2024-04-16T13:38:46.455701Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-16T13:38:46.455714Z",
"modified": "2024-04-16T13:38:46.461555Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6101,
"topic": "gcn.circular",
"uuid": "71ed6042-c480-4c90-be9d-d036fbd0aefa",
"title": "Transient EPW20240219aa: Kp-band imaging observations with NIRES",
"submitter": "Hop gcn.circular",
"authors": "Viraj Karambelkar at Indian Inst of Tech,Bombay <karambelkarvraj21197@gmail.com>",
"data": {
"date": "24/02/26 21:05:11 GMT",
"from": "Viraj Karambelkar at Indian Inst of Tech,Bombay <karambelkarvraj21197@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35808"
},
"title": "GCN CIRCULAR",
"number": "35808",
"subject": "Transient EPW20240219aa: Kp-band imaging observations with NIRES"
},
"message_text": "Viraj Karambelkar (Caltech), Tomas Ahumada (Caltech), Mansi Kasliwal\n(Caltech)\n\nWe observed the location of the X-ray flare EPW20240219aa (Zhang et al.,\nATel #16463; Zhang et al., GCN #35773) in the near-infrared K prime-band\n(Kp) with the NIRES acquisition camera on the Keck II telescope starting\nUTC 2024-02-25T05:12:12.45.\n\nWe obtained four 300 second exposures that covered the locations of the VLA\nradio sources # 1-6 reported in GCN #35788. The Kp-band observations\nreached a depth of ~19.5 mag (Vega). We use an archival Ks-band image of\nthe field from the UKIRT Galactic Plane Survey (Lucas et al. 2008) to\ncalibrate the NIRES images. The depth of the UKIRT image is ~19 mag (Vega).\n\nWe detect sources at the locations of the VLA sources #1, 2, 3 and 6 in the\nNIRES image.\n\nVLA-1 : We detect a source with m_Kp ~ 19 mag (Vega) that is ~0.8 arcsec\noffset from the VLA position reported in GCN #35788. The source is also\nmarginally visible in the archival UKIRT image (which is shallower than the\nnew NIRES image.)\n\nVLA-2 has m_Kp ~ 17 mag (Vega) and appears as an extended source in the\nNIRES as well as archival UKIRT image. There is no substantial variation\nbetween the two epochs.\n\nVLA-3 has m_Kp ~ 19 mag (Vega) and is not detected in the archival image\n(limit ~19 mag).\n\nVLA-4 and VLA-5 are not detected in our images.\n\nVLA-6 is clearly detected as an extended source in both the NIRES and\narchival images. As reported in GCN #35803, this source does not show any\nvariations, and is likely a galaxy unrelated to the transient.\n\nVLA-7 was not covered by our observations.\n\nIn addition to these, we do not detect any new sources in the NIRES\nobservations.\n\nVLA-3 is the most promising source in terms of association with the X-ray\ntransient. We encourage further follow-up.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35808.",
"published": "2024-02-26T21:05:22.184354Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-26T21:05:22.184373Z",
"modified": "2024-02-26T21:05:22.190344Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6102,
"topic": "gcn.circular",
"uuid": "0d7f08e2-d8e7-441c-b26c-483ea298a610",
"title": "GRB 240226B: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "24/02/26 21:41:00 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35809"
},
"title": "GCN CIRCULAR",
"number": "35809",
"subject": "GRB 240226B: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely LONG GRB\n\nAt 05:40:04 UT on 26 Feb 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240226B (trigger 730618809.579832 / 240226236).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 353.7, Dec = -24.4 (J2000 degrees, equivalent to J2000 23h 34m, -24d 23'), with a statistical uncertainty of 5.4 degrees.\n\nThe angle from the Fermi LAT boresight is 100.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240226236/quicklook/glg_skymap_all_bn240226236.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240226236/quicklook/glg_healpix_all_bn240226236.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240226236/quicklook/glg_lc_medres34_bn240226236.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35809.",
"published": "2024-02-26T21:41:14.985270Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-26T21:41:14.985297Z",
"modified": "2024-02-26T21:41:14.993231Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6619,
"topic": "gcn.circular",
"uuid": "0cc6b817-9f90-4df5-8199-cd405733e519",
"title": "GRB 240414A: AbAO optical upprer limit",
"submitter": "Hop gcn.circular",
"authors": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"data": {
"date": "24/04/16 14:12:25 GMT",
"from": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36137"
},
"title": "GCN CIRCULAR",
"number": "36137",
"subject": "GRB 240414A: AbAO optical upprer limit"
},
"message_text": "N. Pankov (HSE, IKI), R. Ya. Inasaridze (AbAO), A. Pozanenko (IKI),\nS. Belkin (IKI) report on behalf of GRB-IKI-FuN:\n\nWe observed the field of GRB 240414A (Caputo et. al., GCN 36083) at\nredshift z=1.833 (Adami et al., GCN 36085; de Ugarte Postigo et al., GCN 36087) with 70-cm AS-32 telescope of Abastumani Observatory (AbAO). The observations were started on 2024-04-14 (UT) 22:06:33, i.e. ~20 hr since the Swift trigger. We took 117 frames 60 sec each in the R-filter. The optical counterpart (Schneider et al., GCN 36084; Adami et al., GCN 36085; de Ugarte Postigo et al., GCN 36087; Niwano et al., GCN 36088; Lipunov et al., GCN 36095; Dutton et al., GCN 36097; Peretto, GCN 36100; Turpin et al., GCN 36101; Karambelkar et al., GCN 36103; Odeh et al., GCN 36111; Pankov et al., GCN 36113; Siegel & Caputo, GCN 36115; de Ugarte Postigo et al., GCN 36117; Xiong et al., GCN 36130; Wang et al., GCN 36131; Lopresti et al., GCN 36133) is not detected in the stacked image of 113x60 sec. Preliminary photometry is following:\n\nDate UT_start t-T0 Filter Exp. OT err UL(3sigma)\n (mid, days) (s)\n2024-04-14 22:06:33 0.86281 R 113*60 n/d n.d 21.4\n\nThe magnitudes were calibrated with nearby USNO-B1.0 stars.\n\nThe result is in agreement with observations carried out by other groups, in particular, with (de Ugarte Postigo et al., GCN 36117) at the similar epoch.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36137.",
"published": "2024-04-16T14:12:41.272955Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-16T14:12:41.272970Z",
"modified": "2024-04-16T14:12:41.280924Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6620,
"topic": "gcn.circular",
"uuid": "73ccc9e8-c224-4945-aea8-018ffc3b858f",
"title": "EP240416a: EP-WXT detection of a fast X-ray transient",
"submitter": "Hop gcn.circular",
"authors": "EP Team at NAOC/CAS <ep_ta@bao.ac.cn>",
"data": {
"date": "24/04/16 16:41:11 GMT",
"from": "EP Team at NAOC/CAS <ep_ta@bao.ac.cn>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36138"
},
"title": "GCN CIRCULAR",
"number": "36138",
"subject": "EP240416a: EP-WXT detection of a fast X-ray transient"
},
"message_text": "H. Q. Cheng, W. X. Wang, W. Yuan, Y. Liu, Z. X. Ling, C. Zhang, C. C. Jin, W. Chen, C. Z. Cui, D. W. Fan, H. B. Hu, J. W. Hu, M. H. Huang, D. Y. Li, T. Y. Lian, H. Y. Liu, M. J. Liu, Z. Z. Lv, X. Mao, H. W. Pan, X. Pan, H. Sun, Y. L. Wang, Q. Y. Wu, X. P. Xu, Y. F. Xu, H. N. Yang, M. Zhang, W. D. Zhang, W. J. Zhang, Z. Zhang, D. H. Zhao (NAOC, CAS), E. Kuulkers, A. Santovincenzo (ESA), P. O'Brien (Univ. of Leicester), K. Nandra, A. Rau (MPE), B. Cordier (CEA), on behalf of the Einstein Probe team\n\nWe report on the detection of a fast X-ray transient EP240416a at 2024-04-16T02:42:13 (UTC) by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission during a calibration observation. The position of the source is R.A. = 203.150 deg, DEC = -13.612 deg (J2000) with an uncertainty of 3 arcmin (radius, 90% C.L. statistical and systematic). The flare lasted for at least 200 seconds, with the tail of the fading light curve undetected due to the interruption of the observation. The peak flux reached ~1.3 x 10^-9 erg/s/cm^2 in the 0.5-4.0 keV band. The averaged 0.5-4.0 keV spectrum can be fitted with an absorbed power law (with the column density fixed at the Galactic value of 4.0 x 10^20 cm^-2) with a photon index of 1.5(-0.6/+0.6). The derived average unabsorbed 0.5-4.0 keV flux is 5.0(-1.6/+2.6) x 10^-10 erg/s/cm^2. The uncertainties are at the 90% confidence level for the above parameters.\n \nNo previously known bright X-ray sources are found within the error circle around the source position. The derived source parameters may be subject to larger uncertainties than those quoted here since the in-orbit calibration of the instrument is still in progress.\n\nFurther follow-up observations are encouraged to identify the nature of this X-ray transient.\n\nThe above observation was made with EP-WXT during the commissioning phase. Launched on January 9, 2024, EP is a space X-ray observatory to monitor the soft X-ray sky with X-ray follow-up capability (Yuan et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics). EP is a mission of the Chinese Academy of Sciences in collaboration with ESA, MPE and CNES.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36138.",
"published": "2024-04-16T16:41:27.276152Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-16T16:41:27.276165Z",
"modified": "2024-04-16T16:41:27.285627Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6622,
"topic": "gcn.circular",
"uuid": "bafbc285-8c6d-49b8-8a81-4a9468f3526f",
"title": "EP240416a: Kinder optical counterpart candidate",
"submitter": "Hop gcn.circular",
"authors": "Janet Chen at National Central University <janetstars@gmail.com>",
"data": {
"date": "24/04/16 19:39:25 GMT",
"from": "Janet Chen at National Central University <janetstars@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36139"
},
"title": "GCN CIRCULAR",
"number": "36139",
"subject": "EP240416a: Kinder optical counterpart candidate"
},
"message_text": "T.-W. Chen, A. Aryan (both NCUIA), S. Yang (HNAS), S. J. Smartt (Oxford/QUB), M. Fulton (QUB), W.-J. Hou, H.-Y. Hsiao, C.-H. Lai, Y.-C. Pan, A. Sankar.K, M.-H. Lee, C.-C. Ngeow, C.-S. Lin, H.-C. Lin, J.-K. Guo (all NCUIA), J. Gillanders, L. Rhodes, S. Srivastav, H. F. Stevance (all Oxford), T. Moore and K. W. Smith (both QUB) report:\n\nWe observed the field of EP240416a (Cheng et al., GCN 36138) using the Lulin One-meter Telescope (LOT) at Lulin Observatory in Taiwan as part of the Kinder collaboration (Chen et al., AstroNote 2021-92). The first LOT epoch of observations started at 16:51 UT on 16 of April 2024 (MJD = 60416.702), 14.15 hours after the EP trigger.\n\nWe used the Kinder pipeline (Yang et al. A&A 646, A22) to stack the images and subtract the stacked images with the PanSTARRS1 template images. We detected an optical transient in the difference image, at RA = 13:32:34.514, Dec = -13:37:49.05 (which is 69.6 arcsec away from the reported coordinate of EP240416a by Cheng et al. GCN 36138).\n\nThe details of the observations and measured PSF magnitudes (in the AB system) of the possible counterpart of EP240416a are as follows:\n\nTelescope | Filter | MJD | t-t0 | Exposure | Magnitude | avg. Seeing | med. Airmass\nLOT | g | 60416.702 | 14.15 hrs | 300 sec * 7 | 22.39 +/- 0.12 | 1\".4 | 1.86\nLOT | r | 60416.707 | 14.27 hrs | 300 sec * 7 | 22.08 +/- 0.12 | 1\".3 | 1.40\nLOT | i | 60416.711 | 14.36 hrs | 300 sec * 7 | 22.02 +/- 0.16 | 1\".3 | 1.54\n\nThe MJD reported is the start time of the first observation in each band. We observed in a sequence of 300 sec in g,r and i, then 6x300 in r, i, g. All measurements were made on the 7-frame co-adds. The presented magnitudes are calibrated using the field stars from the PanSTARRS1 catalog and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V) = 0.05 mag in the direction of the burst (Schlafly & Finkbeiner 2011).\n\nFurther follow-up observations are encouraged to identify the nature of this X-ray transient.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36139.",
"published": "2024-04-16T19:39:45.629115Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-16T19:39:45.629128Z",
"modified": "2024-04-16T19:39:45.639691Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6103,
"topic": "gcn.circular",
"uuid": "3cd4802a-fc2b-4456-92ad-ee769f3e8630",
"title": "GRB 240225B: Swift-XRT observations",
"submitter": "Hop gcn.circular",
"authors": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"data": {
"date": "24/02/26 22:22:37 GMT",
"from": "Phil Evans at U of Leicester <pae9@star.le.ac.uk>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35810"
},
"title": "GCN CIRCULAR",
"number": "35810",
"subject": "GRB 240225B: Swift-XRT observations"
},
"message_text": "A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAR), T. Sbarrato (INAF-OAB),\nJ.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), D.N. Burrows (PSU), J.P.\nOsborne (U. Leicester), K.L. Page (U. Leicester) and P.A. Evans (U.\nLeicester) and A. A. Breeveld (UCL-MSSL) reports on behalf of the\nSwift-XRT and the Swift-UVOT team:\n\nSwift-XRT has performed follow-up observations of the MAXI-detected\nburst GRB 240225B in a series of observations tiled on the sky. The\ntotal exposure time is 1.8 ks, distributed over 7 tiles; the maximum\nexposure at a single sky location was 693 s. The data were collected\nbetween T0+29.1 ks and T0+30.9 ks, and are entirely in Photon Counting\n(PC) mode.\n\nTwo uncatalogued X-ray sources are detected, of which one (\"Source 1\")\nis above the RASS 3-sigma upper limit at this position. The position of\nthis source is RA, Dec\u00128.3629, +27.0746 which is equivalent to:\n\nRA (J2000): 08:33:27.11\nDec(J2000): +27:04:28.5\n\nwith an uncertainty of 4.4 arcsec (radius, 90% confidence). This\nposition is 25.3 arcmin from the MAXI position. At the present time the\nlight curve of Source 1 shows no signs of fading and we can not\nconfirm this source as the GRB afterglow.\n\nThe results of the full analysis of the tiled XRT observations are\navailable at https://www.swift.ac.uk/xrt_products/TILED_GRB00124.\n\nSource 1 was out of the field of view for UVOT so we can't say anything\nabout optical properties.\n\nThis circular is an official product of the Swift team.\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35810.",
"published": "2024-02-26T22:22:58.539891Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-26T22:22:58.539918Z",
"modified": "2024-02-26T22:22:58.547918Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6104,
"topic": "gcn.circular",
"uuid": "6af2bee2-4eed-48d0-97b2-ad358b8c385e",
"title": "GRB 240225B: CALET Gamma-Ray Burst Monitor detection",
"submitter": "Hop gcn.circular",
"authors": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"data": {
"date": "24/02/26 22:35:56 GMT",
"from": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35811"
},
"title": "GCN CIRCULAR",
"number": "35811",
"subject": "GRB 240225B: CALET Gamma-Ray Burst Monitor detection"
},
"message_text": "Y. Kawakubo (LSU), A. Yoshida, T. Sakamoto, S. Sugita (AGU),\nK. Yamaoka (Nagoya U), S. Nakahira (JAXA),\nY. Asaoka (ICRR), S. Torii, Y. Akaike, K. Kobayashi (Waseda U),\nY. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC),\nM. L. Cherry (LSU), S. Ricciarini (U of Florence),\nP. S. Marrocchesi (U of Siena),\nand the CALET collaboration:\n\nThe long GRB 240225B (MAXI/GSC detection: Nakajima et al.,\nGCN Circ. 35796; AstroSat CZTI detection: Joshi et al., 35798)\nwas detected in the ground analysis of the CALET Gamma-ray\nBurst Monitor (CGBM) data around 20:12:08.50 on 25 February\n2024 (referenced to the AstroSat detection: GCN Circ. 35798)\n(http://cgbm.calet.jp/cgbm_trigger/flight/1392926875/index.html).\nThe main episode that AstroSat CZTI detected was seen by all CGBM\ndetectors. Also, a hint of emission that MAXI/GSC detected was seen\nin the HXM data around T+230 s.\n\nThe burst light curve of the main episode shows a multi-peaked\nstructure that starts at T-7.6 sec, and ends at T+31.1 sec. The T90\nand T50 durations measured by the SGM data are 33.0 +/- 0.9 sec\nand 17.1 +/- 1.3 sec (40-1000 keV), respectively.\n\nThe ground-processed light curve is available at\n\nhttp://cgbm.calet.jp/cgbm_trigger/ground/1392926875/index.html\n\nThe CALET data used in this analysis are provided by\nthe Waseda CALET Operation Center located at Waseda University.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35811.",
"published": "2024-02-26T22:36:16.502226Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-26T22:36:16.502250Z",
"modified": "2024-02-26T22:36:16.508480Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6107,
"topic": "gcn.circular",
"uuid": "e7c84401-b237-476e-a2f6-bfd7b98d6103",
"title": "GRB 240227A: Fermi GBM Final Real-time Localization",
"submitter": "Hop gcn.circular",
"authors": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"data": {
"date": "24/02/27 04:48:09 GMT",
"from": "Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35814"
},
"title": "GCN CIRCULAR",
"number": "35814",
"subject": "GRB 240227A: Fermi GBM Final Real-time Localization"
},
"message_text": "The Fermi GBM team reports the detection of a likely SHORT GRB\n\nAt 04:40:15 UT on 27 Feb 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240227A (trigger 730701620.164308 / 240227195).\n\nThe on-ground calculated location, using the Fermi GBM trigger data, is RA = 69.6, Dec = -61.2 (J2000 degrees, equivalent to J2000 04h 38m, -61d 12'), with a statistical uncertainty of 3.6 degrees.\n\nThe angle from the Fermi LAT boresight is 13.0 degrees.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240227195/quicklook/glg_skymap_all_bn240227195.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240227195/quicklook/glg_healpix_all_bn240227195.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240227195/quicklook/glg_lc_medres34_bn240227195.gif\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35814.",
"published": "2024-02-27T04:48:28.412569Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-27T04:48:28.412596Z",
"modified": "2024-02-27T04:48:28.422038Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6108,
"topic": "gcn.circular",
"uuid": "701ccfa0-5dc4-40d9-8918-d2b411b854cf",
"title": "Swift-BAT triggers 1217729-1217732 are not astrophysical",
"submitter": "Hop gcn.circular",
"authors": "Simone Dichiara at Pennsylvania State University <sbd5667@psu.edu>",
"data": {
"date": "24/02/27 05:36:15 GMT",
"from": "Simone Dichiara at Pennsylvania State University <sbd5667@psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35815"
},
"title": "GCN CIRCULAR",
"number": "35815",
"subject": "Swift-BAT triggers 1217729-1217732 are not astrophysical"
},
"message_text": "S. Dichiara (PSU) reports on behalf of the Neil Gehrels Swift Observatory Team:\n\nSwift triggers 1217729, 1217731 and 1217732 were caused by a star track loss-of-lock event, and are not interesting astrophysical events.\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35815.",
"published": "2024-02-27T05:36:38.907199Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-27T05:36:38.907235Z",
"modified": "2024-02-27T05:36:38.915763Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6109,
"topic": "gcn.circular",
"uuid": "3d28f3a3-3984-4a1b-8c1c-6e7183d8eb36",
"title": "Swift-BAT triggers 1217733 - 1217736 are not astrophysical events",
"submitter": "Hop gcn.circular",
"authors": "Simone Dichiara at Pennsylvania State University <sbd5667@psu.edu>",
"data": {
"date": "24/02/27 06:29:34 GMT",
"from": "Simone Dichiara at Pennsylvania State University <sbd5667@psu.edu>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35816"
},
"title": "GCN CIRCULAR",
"number": "35816",
"subject": "Swift-BAT triggers 1217733 - 1217736 are not astrophysical events"
},
"message_text": "S. Dichiara (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:\n\nSwift-BAT triggers 1217733, 1217734 and 1217736 are also related to the ongoing star tracker loss-of-lock event, and they are not of astrophysical interest.\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35816.",
"published": "2024-02-27T06:29:50.811493Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-27T06:29:50.811521Z",
"modified": "2024-02-27T06:29:50.819531Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6110,
"topic": "gcn.circular",
"uuid": "ccd059b1-2336-4c41-8cc5-2b7bafec323f",
"title": "Fermi GRB 240226A: Global MASTER-Net observations report",
"submitter": "Hop gcn.circular",
"authors": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"data": {
"date": "24/02/27 11:30:55 GMT",
"from": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35817"
},
"title": "GCN CIRCULAR",
"number": "35817",
"subject": "Fermi GRB 240226A: 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 GRB 240226A ( Fermi GBM team, GCN 35804) errorbox 16246 sec after notice time and 16283 sec after trigger time at 2024-02-27 00:04:30 UT, with upper limit up to 16.8 mag. The observations began at zenith distance = 79 deg. The sun altitude is -45.7 deg.\n\nThe galactic latitude b = -23 deg., longitude l = 355 deg.\n\n\nReal time updated cover map and OT discovered available here:\nhttps://master.sai.msu.ru/site/master2/observ.php?id#86845\n\nWe obtain a following upper limits.\n\nTmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n 16314 | 2024-02-27 00:04:30 | MASTER-SAAO | (19h 06m 29.14s , -46d 29m 24.3s) | C | 60 | 16.3 |\n 16314 | 2024-02-27 00:04:30 | MASTER-SAAO | (18h 59m 24.88s , -46d 17m 34.7s) | C | 60 | 16.5 |\n 16393 | 2024-02-27 00:05:50 | MASTER-SAAO | (18h 56m 09.53s , -42d 41m 16.4s) | C | 60 | 16.0 |\n 16393 | 2024-02-27 00:05:50 | MASTER-SAAO | (18h 49m 32.02s , -42d 29m 23.5s) | C | 60 | 16.4 |\n 16473 | 2024-02-27 00:07:10 | MASTER-SAAO | (18h 49m 52.02s , -44d 33m 18.5s) | C | 60 | 16.5 |\n 16473 | 2024-02-27 00:07:10 | MASTER-SAAO | (18h 43m 01.98s , -44d 21m 24.2s) | C | 60 | 16.8 |\n 16633 | 2024-02-27 00:09:50 | MASTER-SAAO | (19h 04m 23.32s , -44d 22m 12.6s) | C | 60 | 16.7 |\n 16713 | 2024-02-27 00:11:09 | MASTER-SAAO | (19h 02m 49.54s , -48d 22m 23.9s) | C | 60 | 16.4 |\n 16713 | 2024-02-27 00:11:09 | MASTER-SAAO | (18h 55m 29.79s , -48d 10m 32.0s) | C | 60 | 16.8 |\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/35817.",
"published": "2024-02-27T11:31:13.525288Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-27T11:31:13.525310Z",
"modified": "2024-02-27T11:31:13.533366Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6623,
"topic": "gcn.circular",
"uuid": "0925e458-c331-4b92-ab03-42fc9bb9a358",
"title": "GRB 240414A: Swift-BAT refined analysis",
"submitter": "Hop gcn.circular",
"authors": "Mike Moss at NASA GSFC <mikejmoss3@gmail.com>",
"data": {
"date": "24/04/16 19:56:23 GMT",
"from": "Mike Moss at NASA GSFC <mikejmoss3@gmail.com>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/36140"
},
"title": "GCN CIRCULAR",
"number": "36140",
"subject": "GRB 240414A: Swift-BAT refined analysis"
},
"message_text": "C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC),\nR. Caputo (GSFC), H. A. Krimm (NSF),\nS. Laha (GSFC/UMBC), A. Y. Lien (U Tampa),\nM. J. Moss (GSFC), D. M. Palmer (LANL),\nT. Parsotan (GSFC), T. Sakamoto (AGU)\n(i.e. the Swift-BAT team):\n\nUsing the data set from T-61 to T+199 sec from the recent telemetry downlink,\nwe report further analysis of BAT GRB 240414A (trigger #1221714)\n(Caputo, et al., GCN Circ. 36083). The BAT ground-calculated position is\nRA, Dec = 184.781, 56.734 deg which is\n RA(J2000) = 12h 19m 07.5s\n Dec(J2000) = +56d 44' 03.0\"\nwith an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 91%.\n\nThe mask-weighted light curve shows multiple pulses starting at T0-35 s through\nT0+40 s, with another pulse at T0+110 s. There may be additional emission prior\nto the currently available data starting from ~T0-61 s.\nT90 (15-350 keV) is 88.28 +- 50.41 sec (estimated error including systematics).\n\nThe time-averaged spectrum from TTBD to TTBD sec is best fit by a power law\nwith an exponential cutoff. This fit gives a photon index 0.99 +- 0.36,\nand Epeak of 97.0 +- 62.5 keV (chi squared 46.83 for 56 d.o.f.). For this\nmodel the total fluence in the 15-150 keV band is 3.5 +- 0.2 x 10^-06 erg/cm2\nand the 1-sec peak flux measured from T+2.04 sec in the 15-150 keV band is\n1.5 +- 0.2 ph/cm2/sec. A fit to a simple power law gives a photon index\nof 1.49 +- 0.08 (chi squared 53.19 for 57 d.o.f.). All the quoted errors\nare at the 90% confidence level.\n\nThe results of the batgrbproduct analysis are available at\nhttps://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1221714\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/36140.",
"published": "2024-04-16T19:56:40.176402Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-04-16T19:56:40.176418Z",
"modified": "2024-04-16T19:56:40.191367Z",
"nonlocalizedevents": [],
"targets": []
},
{
"id": 6111,
"topic": "gcn.circular",
"uuid": "dbea854c-9aee-482c-9655-710be3c6a36b",
"title": "GRB 240218A: CMO SAI NIR upper limit",
"submitter": "Hop gcn.circular",
"authors": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"data": {
"date": "24/02/27 12:04:54 GMT",
"from": "Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>",
"urls": {
"gcn_circular": "https://gcn.nasa.gov/circulars/35818"
},
"title": "GCN CIRCULAR",
"number": "35818",
"subject": "GRB 240218A: CMO SAI NIR upper limit"
},
"message_text": "A. Volnova (IKI), A. Pozanenko (IKI), B. Safonov (SAI MSU), A. Tatarnikov (SAI MSU), N. Pankov (HSE, IKI), S. Belkin (IKI, HSE) report on behalf of IKI-GRB-FuN:\n\nWe observed the field of GRB 240218A (Page et al., GCN 35742; Veres et al., GCN 35755; Svinkin et al., GCN 35758) with the Astronomical Near-Infrared Camera-spectrograph (ANC) of the 2.5-meter telescope (SAI-2.5) of the Caucasian Mountain Observatory (CMO SAI) on Feb.23, 2024 starting on 22:16:46 UT, taking 47 frames of 1-minute exposure in the H-band under moderate conditions with seeing of 1.4\". We do not detect the NIR counterpart (D'Avanzo et al., GCN 35747; Saccardi et al., 35756; Schroeder et al., GCN 35794; Rossi et al., GCN 35762; de Wet et al., GCN 35765) within the enhanced XRT error box (Evans et al., GCN 35748).\nPreliminary photometry of the stacked image is following\n\nDate UT start t-T0 Filter Exp. OT UL(3sigma)\n (mid, days) (s)\n2024-02-23 22:16:46 5.86743 H 47*59 n/d 20.8\n\nThe photometry is based on nearby 2MASS stars:\n\n2MASS_ID RA Dec H errH\n10471145+0118146 10:47:11.45808 +01:18:14.6268 15.422 0.098\n10471594+0117439 10:47:15.94200 +01:17:43.9836 14.562 0.062\n10471583+0116464 10:47:15.83136 +01:16:46.4844 14.243 0.045\n\n\n\n\nView this GCN Circular online at https://gcn.nasa.gov/circulars/35818.",
"published": "2024-02-27T12:05:10.078697Z",
"message_parser": "GCN Circular Parser v1",
"retracted": false,
"created": "2024-02-27T12:05:10.078722Z",
"modified": "2024-02-27T12:05:10.087190Z",
"nonlocalizedevents": [],
"targets": []
}
]
}
