November 2025 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 40672] Fermi GBM Sub-Threshold Detection of GRB 251106A
by GCN Circulars 07 Nov '25

07 Nov '25

TITLE: GCN CIRCULAR NUMBER: 42609 SUBJECT: Fermi GBM Sub-Threshold Detection of GRB 251106A DATE: 25/11/07 03:05:39 GMT FROM: Matt Godwin <msg0028(a)uah.edu> M. Godwin (UAH) and R. Hamburg (UAH) report on behalf of the Fermi-GBM Team: SVOM/ECLAIRs detected GRB 251106A on 2025-11-06 at 19:56:37 UTC (Antier et al. 2025, GCN 42605). There was no Fermi-GBM onboard trigger around this event time. An automated, blind search for gamma-ray bursts below the onboard triggering threshold in Fermi-GBM identified a roughly spatially-consistent candidate at 19:58:18.89 UTC. The GBM Targeted Search [1], the most sensitive coherent search for GRB-like signals in GBM, also identified a transient spatially consistent with GRB 251106A approximately 10 s before the SVOM trigger time. It is detected most significantly ~133 s after the SVOM trigger time on a 4.096 s timescale with a false alarm rate of 3.8e-5 Hz. The event was best-fit using a "normal" GRB spectrum (Band function with Epeak = 230 keV, alpha = -1.0, beta = -2.3). The Targeted Search localization is consistent with the SVOM/ECLAIRs location. [1] Goldstein et al. 2019 arXiv:1903.12597 View this GCN Circular online at https://gcn.nasa.gov/circulars/42609. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40671] GRB 251106A: Swift/BAT arcminute localization of a burst
by GCN Circulars 07 Nov '25

07 Nov '25

TITLE: GCN CIRCULAR NUMBER: 42608 SUBJECT: GRB 251106A: Swift/BAT arcminute localization of a burst DATE: 25/11/07 02:59:54 GMT FROM: Jimmy DeLaunay at Penn State <delauj2(a)gmail.com> James DeLaunay (PSU), Samuele Ronchini (GSSI), Aaron Tohuvavohu (Cosmic Frontier), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report: Swift/BAT did not localize GRB 251106A onboard (T0: 2025-11-06T19:56:37 UTC, SVOM/ECLAIRS GCN 42605). In a ground search of a 10 s event file, available due to a subthreshold trigger onboard. The GRB was detected at a S/N of 7.0 in a single 10 s, 15-150 keV image starting at ~T0 + 129 s. The BAT position is RA, Dec = 234.4744, +63.3387 deg which is RA(J2000) = 15h 37m 53.9s Dec(J2000) = +63d 20′ 19.3″ with an estimated uncertainty of 3 arcmin radius. View this GCN Circular online at https://gcn.nasa.gov/circulars/42608. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40670] GRB 251106A: SVOM/COLIBRÍ (FM-GFT) detection of a likely optical counterpart
by GCN Circulars 07 Nov '25

07 Nov '25

TITLE: GCN CIRCULAR NUMBER: 42607 SUBJECT: GRB 251106A: SVOM/COLIBRÍ (FM-GFT) detection of a likely optical counterpart DATE: 25/11/07 02:38:53 GMT FROM: Camila Angulo Valdez at UNAM <camiangulo(a)astro.unam.mx> Camila Angulo (UNAM), Francis Fortin (IRAP), Jean-Luc Atteia (IRAP), Alan M. Watson (UNAM), Stéphane Basa (UAR Pytheas), William H. Lee (UNAM), Dalya Akl (NYUAD), Sarah Antier (IJCLAB), Rosa L. Becerra (UNAM), Nathaniel R. Butler (ASU), Damien Dornic (CPPM), Jean-Grégoire Ducoin (CPPM), Leonardo García García (UNAM), Ramandeep Gill (UNAM), Noémie Globus (UNAM), Kin Ocelotl López (UNAM), Diego López-Cámara (UNAM), Francesco Magnani (CPPM), Enrique Moreno Méndez (UNAM), Margarita Pereyra (UNAM), Ny Avo Rakotondrainibe (LAM), Fredd Sánchez Álvarez (UNAM), Benjamin Schneider (LAM), and Antonio de Ugarte Postigo (LAM) report: We imaged the field of the SVOM GRB 251106A (Antier et al., GCN Circ. 42605) using the DDRAGO wide-field imager on the SVOM/COLIBRÍ (FM-GFT) telescope. We observed from 2025-11-07 01:46 to 01:52 UTC (from 5.82 to 5.93 hours after the trigger) and obtained 360 seconds of simultaneous exposure in the r and z filters. The data were analyzed with STDWeb/STDPipe (Karpov 2025). The photometry was calibrated using nearby stars from the PanSTARRS DR1 catalog, is in the AB system, and is not corrected for Galactic extinction. We detect an uncatalogued source (revealed by image subtraction using PanSTARRS as template) consistent with the XRT 2.6 arcsec error circle (https://www.swift.ac.uk/SVOM/SVOM_FIELD00048/) at RA, DEC = 234.462239, 63.367568 (J2000) and with preliminary magnitudes of: r = 21.49 +/- 0.10 z = 20.77 +/- 0.13 We suggest this is likely to be the optical counterpart of the GRB. Further observations are ongoing. We thank the staff of the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir and the COLIBRÍ and DDRAGO engineering teams. COLIBRÍ is an astronomical observatory developed and operated jointly by France (AMU, CNES and CNRS) and Mexico (UNAM and SECIHTI). It is located at the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir, Baja California, Mexico. View this GCN Circular online at https://gcn.nasa.gov/circulars/42607. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40669] GRB 251106A: MASTER optical observations
by GCN Circulars 06 Nov '25

06 Nov '25

TITLE: GCN CIRCULAR NUMBER: 42606 SUBJECT: GRB 251106A: MASTER optical observations DATE: 25/11/06 22:11:56 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.A. Senik, V.M. Lipunov, A.Kuznetsov, E.Gorbovskoy, G.Antipov, 1P.Balanutsa, I.Panchenko, N. Tiurina, K.Zhirkov, Ya.Kechin, A.Chasovnikov, V.Topolev, D.Vlasenko, Yu. Tselik(Lomonosov MSU, SAI, Moscow), R. Podesta, C.Francile, F. Podesta, E. Gonzalez (OAFA, San Juan Uni.,Argentina); D. Buckley (SAAO, South Africa), O. Gress, N.Budnev, O.Ershova (Irkutsk State University), A. Sosnovskij (CrAO RAS), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity), V.M.Pillet, R.Rebolo Lopez (The Instituto de Astrofisica de Canarias, Spain),L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez,J.Martinez,A.R.Corella,L.H.Rodriguez (INAOE, Guillermo Haro Astrophysic Observatory, Mexico) MASTER-Kislovodsk robotic telescope (Global MASTER-Net [1-4], http://observ.pereplet.ru) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of SVOM GRB 251106A (Antier et al. GCN 42605, Ttrigger= 2025-11-06T19:56:37, Tnotice=2025-11-06 20:21:29.84UT) error-box observations 1550 sec after trigger time at 2025-11-06 20:22:27 UT, with upper limit up to 17.9 mag. The observations began 17deg altitude. The sun altitude was -62.3 deg. The galactic latitude b = 45 deg., longitude l = 98 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=3034637 There is no optical counterpart withthe following MASTER upper limits upper limits: Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment 1610 | 2025-11-06 20:22:27 | MASTER-Kislovodsk | (15h 37m 28.85s,+63d 06m 03.4s) | P- | 120 | 15.6 | 1750 | 2025-11-06 20:24:47 | MASTER-Kislovodsk | (15h 37m 29.81s,+63d 05m 56.6s) | P- | 120 | 15.6 | 1750 | 2025-11-06 20:24:47 | MASTER-Kislovodsk | (15h 37m 42.69s,+63d 28m 24.2s) | P| | 120 | 17.2 | 1890 | 2025-11-06 20:27:07 | MASTER-Kislovodsk | (15h 37m 30.71s,+63d 05m 51.6s) | P- | 120 | 15.5 | 1890 | 2025-11-06 20:27:07 | MASTER-Kislovodsk | (15h 37m 43.57s,+63d 28m 18.7s) | P| | 120 | 17.3 | 2030 | 2025-11-06 20:29:27 | MASTER-Kislovodsk | (15h 37m 31.56s,+63d 05m 46.7s) | P- | 120 | 15.6 | 2030 | 2025-11-06 20:29:27 | MASTER-Kislovodsk | (15h 37m 44.37s,+63d 28m 13.8s) | P| | 120 | 17.2 | 2140 | 2025-11-06 20:31:47 | MASTER-Kislovodsk | (15h 37m 25.48s,+63d 04m 04.1s) | C | 60 | 17.0 | 2260 | 2025-11-06 20:31:47 | MASTER-Kislovodsk | (15h 37m 25.50s,+63d 04m 04.1s) | C | 300 | 17.5 | Coadd 2140 | 2025-11-06 20:31:47 | MASTER-Kislovodsk | (15h 37m 38.06s,+63d 26m 36.1s) | C | 60 | 17.4 | 2858 | 2025-11-06 20:43:45 | MASTER-Kislovodsk | (15h 36m 59.84s,+63d 06m 24.9s) | C | 60 | 17.0 | 2918 | 2025-11-06 20:43:45 | MASTER-Kislovodsk | (15h 36m 59.83s,+63d 06m 24.9s) | C | 180 | 17.8 | Coadd 2858 | 2025-11-06 20:43:45 | MASTER-Kislovodsk | (15h 37m 12.09s,+63d 29m 02.0s) | C | 60 | 17.4 | 2938 | 2025-11-06 20:45:05 | MASTER-Kislovodsk | (15h 37m 04.06s,+63d 05m 20.5s) | C | 60 | 17.1 | 2938 | 2025-11-06 20:45:05 | MASTER-Kislovodsk | (15h 37m 16.46s,+63d 27m 56.8s) | C | 60 | 17.5 | 3018 | 2025-11-06 20:46:25 | MASTER-Kislovodsk | (15h 36m 58.81s,+63d 04m 17.3s) | C | 60 | 17.0 | 3018 | 2025-11-06 20:46:25 | MASTER-Kislovodsk | (15h 37m 11.34s,+63d 26m 52.9s) | C | 60 | 17.4 | 3128 | 2025-11-06 20:47:45 | MASTER-Kislovodsk | (15h 37m 04.62s,+63d 04m 30.1s) | C | 120 | 17.3 | 3128 | 2025-11-06 20:47:45 | MASTER-Kislovodsk | (15h 37m 17.42s,+63d 27m 05.1s) | C | 120 | 17.4 | 3289 | 2025-11-06 20:50:26 | MASTER-Kislovodsk | (15h 37m 04.51s,+63d 05m 55.6s) | C | 120 | 17.3 | 3289 | 2025-11-06 20:50:26 | MASTER-Kislovodsk | (15h 37m 17.54s,+63d 28m 30.4s) | C | 120 | 17.5 | 3429 | 2025-11-06 20:52:46 | MASTER-Kislovodsk | (15h 37m 05.48s,+63d 04m 10.8s) | C | 120 | 17.2 | 3549 | 2025-11-06 20:52:46 | MASTER-Kislovodsk | (15h 37m 05.48s,+63d 04m 10.8s) | C | 360 | 17.9 | Coadd 3429 | 2025-11-06 20:52:46 | MASTER-Kislovodsk | (15h 37m 18.70s,+63d 26m 45.1s) | C | 120 | 17.5 | 3569 | 2025-11-06 20:55:05 | MASTER-Kislovodsk | (15h 37m 07.60s,+63d 05m 54.6s) | C | 120 | 17.2 | 3569 | 2025-11-06 20:55:05 | MASTER-Kislovodsk | (15h 37m 20.97s,+63d 28m 28.6s) | C | 120 | 17.4 | 3709 | 2025-11-06 20:57:25 | MASTER-Kislovodsk | (15h 37m 04.73s,+63d 05m 01.2s) | C | 120 | 17.2 | 3709 | 2025-11-06 20:57:26 | MASTER-Kislovodsk | (15h 37m 18.15s,+63d 27m 35.0s) | C | 120 | 17.4 | 3849 | 2025-11-06 20:59:45 | MASTER-Kislovodsk | (15h 37m 04.57s,+63d 05m 58.7s) | C | 120 | 17.1 | 3909 | 2025-11-06 20:59:45 | MASTER-Kislovodsk | (15h 37m 04.57s,+63d 05m 58.8s) | C | 240 | 17.5 | Coadd 3849 | 2025-11-06 20:59:45 | MASTER-Kislovodsk | (15h 37m 18.12s,+63d 28m 32.3s) | C | 120 | 17.4 | 3959 | 2025-11-06 21:02:05 | MASTER-Kislovodsk | (15h 37m 10.31s,+63d 04m 57.0s) | C | 60 | 16.8 | 3959 | 2025-11-06 21:02:05 | MASTER-Kislovodsk | (15h 37m 23.89s,+63d 27m 30.6s) | C | 60 | 17.2 | 4039 | 2025-11-06 21:03:25 | MASTER-Kislovodsk | (15h 37m 05.87s,+63d 03m 55.5s) | C | 60 | 16.8 | 4039 | 2025-11-06 21:03:25 | MASTER-Kislovodsk | (15h 37m 19.52s,+63d 26m 29.2s) | C | 60 | 17.2 | 4118 | 2025-11-06 21:04:45 | MASTER-Kislovodsk | (15h 37m 13.13s,+63d 04m 18.9s) | C | 60 | 16.8 | 4178 | 2025-11-06 21:04:45 | MASTER-Kislovodsk | (15h 37m 13.12s,+63d 04m 18.9s) | C | 180 | 17.3 | Coadd 4118 | 2025-11-06 21:04:45 | MASTER-Kislovodsk | (15h 37m 26.81s,+63d 26m 52.7s) | C | 60 | 17.1 | Observations and data analysis will be continued. [1] Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L [2] Lipunov et al. 2022, Universe, Vol. 8(5), id.271 [3] Lipunov et a. 2019, ARep, vol.63, 293 [4] Lipunov V., Kornilov V., Gorbovskoy E., Tiurina N., Kuznetsov A. 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics,Lomonosov MSU PRESS, 591pp. http://www.pereplet.ru/lipunov/625.html#625 View this GCN Circular online at https://gcn.nasa.gov/circulars/42606. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40668] GRB 251106A: SVOM detection of a burst
by GCN Circulars 06 Nov '25

06 Nov '25

TITLE: GCN CIRCULAR NUMBER: 42605 SUBJECT: GRB 251106A: SVOM detection of a burst DATE: 25/11/06 20:37:09 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> S. Antier (IJCLAB), M. Dennefeld (IAP), S. Schanne (CEA/Irfu), F. Lacreu (IAP) report on behalf of the SVOM mission team: At 2025-11-06T19:56:37 UTC (T0), SVOM/ECLAIRs triggered and located the gamma-ray burst GRB 251106A (SVOM burst-id sb25110604). The following trigger information was received on the ground with low latency by the SVOM VHF Alert Network. The burst was detected both by the Count-Rate Trigger (CRT) and the Image Trigger (IMT), which produced a sequence of 16 alerts. IMT provided the alert with the best signal-to-noise-ratio in the image (SNR) of 11.02 in the [8-120] keV energy band over a time window of 163.84 seconds starting at 2025-11-06T19:55:40. The localization of the best alert is R.A., Dec. 234.6169, 63.3716 degrees: R.A. (J2000) = 15h38m28.05s Dec. (J2000) = 63d22m17.83s with a 90% confidence level (C.L.) radius of 7.27 arcmin (including systematic error of 2 arcmin added in quadrature). Due to sun constraints, no immediate slew was performed on this burst. No X-ray observation could be performed by SVOM/MXT for the time being. No optical observation could be performed by SVOM/VT for the time being. The Space-based multi-band astronomical Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA), French Space Agency (CNES), and the Chinese Academy of Sciences (CAS), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. SVOM/ECLAIRs was developed jointly by CNES, CEA-IRFU, CNRS-IRAP, CNRS-APC. SVOM/GRM was developed by the Institute of High Energy Physics (IHEP) of CAS. SVOM/MXT was developed jointly by CNES, CEA-IRFU, CNRS-IJCLab, University of Leicester, MPE. The Burst Advocate (BA) on shift for this alert is Sarah Antier: sarah.antier(a)ijclab.in2p3.fr. Please contact the BA by email if you require additional information. View this GCN Circular online at https://gcn.nasa.gov/circulars/42605. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40667] GRB 251103B: AstroSat CZTI detection
by GCN Circulars 06 Nov '25

06 Nov '25

TITLE: GCN CIRCULAR NUMBER: 42604 SUBJECT: GRB 251103B: AstroSat CZTI detection DATE: 25/11/06 19:18:43 GMT FROM: Anuraag Arya at IIT Bombay <aryaanuraag910(a)gmail.com> A. Goyal (IITB), A. Arya (IITB), S. Salunke (IUCAA), M. Tembhurnikar (IUCAA), Harsha K. H. (IUCAA), G. Waratkar (Caltech/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: Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long GRB 251103B which was also detected by Fermi GBM (Fermi GBM Team, GCN Circ. 42555), and Swift BAT (Lanava et. al., GCN Circ. 42556). The source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2025-11-03 16:46:36.50 UTC. The measured peak count rate associated with the burst is 87 (+31, -16) counts/s above the background in the combined data of three quadrants (out of four), with a total of 307 (+118, -98) counts. We caution that there is a 0.3 s readout dead time in CZT data during the burst which affects the calculated total counts. The local mean background count rate was 215 (+2, -4) counts/s. Using cumulative rates, we measure a T90 of 5.86 (+0.85, -2.24) s. The source was also faintly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2025-11-03 16:46:41.66 UTC. The measured peak count rate associated with the burst is 148 (+74, -23) counts/s above the background in the combined data of all quadrants, with a total of 677 (+244, -247) counts. The local mean background count rate was 1281 (+6, -7) counts/s. Due to poor statistics, we cannot reliably estimate the T90 from it. CZTI 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. CZTI GRB detections are reported regularly on the payload site at: http://astrosat.iucaa.in/czti/?q=grb View this GCN Circular online at https://gcn.nasa.gov/circulars/42604. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40666] GRB 251025C: TERI Gamma-ray detection
by GCN Circulars 06 Nov '25

06 Nov '25

TITLE: GCN CIRCULAR NUMBER: 42603 SUBJECT: GRB 251025C: TERI Gamma-ray detection DATE: 25/11/06 17:23:20 GMT FROM: Daniel Shy <danielshy(a)danielshy.com> Daniel Shy (a), C.C. Cheung (a), Bernard Phlips (a), Michael Streicher (b), James Mason (b), Douglas M. Groves (b), Feng Zhang (b), and Willy Kaye (b) (a) U.S. Naval Research Laboratory, 4555 Overlook Ave SW, Washington, DC 20375 (b) H3D, Inc., 812 Avis Dr., Ann Arbor, MI 48108, USA The cadmium zinc TElluride Radiation Imager (TERI) gamma-ray telescope [1], operating on the International Space Station, reports the detection of GRB 251025C, which was also detected by Fermi/GBM (GCN 42449), CALET (GCN 42467), AstroSat CZTI (GCN 42469), and Glowbug (GCN 42490). Using 1 Hz binning, we observe a single peak at 2025-10-25T23:08:40.79 with an excess of 27 counts per second (cps) above the 39 cps baseline rate observed in nearby off-source intervals. The analysis results presented here are preliminary and currently lack a detailed response function. TERI is an Office of Naval Research funded technology demonstrator for large-volume pixelated CdZnTe detectors developed, built, and operated by the U.S. Naval Research Laboratory (NRL) in conjunction with H3D, Inc. The pixelated CdZnTe detectors have an energy range of 40 keV to 3 MeV per pixel. It was launched on 2025 April 21 aboard the Department of Defense Space Test Program’s STP-H10 to the ISS. On the ISS, it is located on the SOX external payload facility on the Columbus module. Analysis of TERI data at NRL is supported under contract with NASA as correlative science for the Fermi Gamma-ray Space Telescope. [1] Shy, Daniel, et al. "Development of the cadmium zinc TElluride Radiation Imager." Journal of Astronomical Telescopes, Instruments, and Systems 10.4 (2024): 044009-044009 (arXiv:2408.04559). Distribution Statement A: Approved for public release. Distribution is unlimited. View this GCN Circular online at https://gcn.nasa.gov/circulars/42603. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40665] GRB 251016B: TERI Gamma-ray detection
by GCN Circulars 06 Nov '25

06 Nov '25

TITLE: GCN CIRCULAR NUMBER: 42602 SUBJECT: GRB 251016B: TERI Gamma-ray detection DATE: 25/11/06 17:21:27 GMT FROM: Daniel Shy <danielshy(a)danielshy.com> Daniel Shy (a), C.C. Cheung (a), Bernard Phlips (a), Michael Streicher (b), James Mason (b), Douglas M. Groves (b), Feng Zhang (b), and Willy Kaye (b) (a) U.S. Naval Research Laboratory, 4555 Overlook Ave SW, Washington, DC 20375 (b) H3D, Inc., 812 Avis Dr., Ann Arbor, MI 48108, USA The cadmium zinc TElluride Radiation Imager (TERI) gamma-ray telescope [1], operating on the International Space Station, reports the detection of GRB 251016B, which was also detected by Fermi/GBM (GCN 42316, 42383), CALET (GCN 42320), AstroSat/CZTI (GCN 42324), IPN triangulation (GCN 42403), Konus-Wind (GCN 42448) Using 1 Hz binning, and adopting T0 = 2025-10-16T23:59:00.72, we observe a single peak at T0+2.5s with an excess of 83 counts per second (cps) above the 39 cps baseline rate observed in nearby off-source intervals. The analysis results presented here are preliminary and currently lack a detailed response function. TERI is an Office of Naval Research funded technology demonstrator for large-volume pixelated CdZnTe detectors developed, built, and operated by the U.S. Naval Research Laboratory (NRL) in conjunction with H3D, Inc. The pixelated CdZnTe detectors have an energy range of 40 keV to 3 MeV per pixel. It was launched on 2025 April 21 aboard the Department of Defense Space Test Program’s STP-H10 to the ISS. On the ISS, it is located on the SOX external payload facility on the Columbus module. Analysis of TERI data at NRL is supported under contract with NASA as correlative science for the Fermi Gamma-ray Space Telescope. [1] Shy, Daniel, et al. "Development of the cadmium zinc TElluride Radiation Imager." Journal of Astronomical Telescopes, Instruments, and Systems 10.4 (2024): 044009-044009 (arXiv:2408.04559). Distribution Statement A: Approved for public release. Distribution is unlimited. View this GCN Circular online at https://gcn.nasa.gov/circulars/42602. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40664] GRB 251016A: TERI Gamma-ray detection of a short burst
by GCN Circulars 06 Nov '25

06 Nov '25

TITLE: GCN CIRCULAR NUMBER: 42601 SUBJECT: GRB 251016A: TERI Gamma-ray detection of a short burst DATE: 25/11/06 15:50:38 GMT FROM: Daniel Shy <danielshy(a)danielshy.com> Daniel Shy (a), C.C. Cheung (a), Bernard Phlips (a), Michael Streicher (b), James Mason (b), Douglas M. Groves (b), Feng Zhang (b), and Willy Kaye (b) (a) U.S. Naval Research Laboratory, 4555 Overlook Ave SW, Washington, DC 20375 (b) H3D, Inc., 812 Avis Dr., Ann Arbor, MI 48108, USA The cadmium zinc TElluride Radiation Imager (TERI) gamma-ray telescope [1], operating on the International Space Station, reports the detection of GRB 251016A, which was also detected by SVOM/ECLAIRs (GCN 42308, 42374), Fermi/GBM (GCN 42309, 42365), Glowbug (GCN 42313), CALET (GCN 42321), AstroSat/CZTI (GCN 42327), Insight-HXMT/HE (GCN 42359), and Konus-Wind (GCN 42473). Using 1 Hz binning, at 2025-10-16T14:59:20.0 we observe a single peak with an excess count rate of roughly 34 counts per second (cps) above the 32 cps baseline rate observed in nearby off-source intervals. The analysis results presented here are preliminary and currently lack a detailed response function. TERI is an Office of Naval Research funded technology demonstrator for large-volume pixelated CdZnTe detectors developed, built, and operated by the U.S. Naval Research Laboratory (NRL) in conjunction with H3D, Inc. The pixelated CdZnTe detectors have an energy range of 40 keV to 3 MeV per pixel. It was launched on 2025 April 21 aboard the Department of Defense Space Test Program’s STP-H10 to the ISS. On the ISS, it is located on the SOX external payload facility on the Columbus module. Analysis of TERI data at NRL is supported under contract with NASA as correlative science for the Fermi Gamma-ray Space Telescope. [1] Shy, Daniel, et al. "Development of the cadmium zinc TElluride Radiation Imager." Journal of Astronomical Telescopes, Instruments, and Systems 10.4 (2024): 044009-044009 (arXiv:2408.04559). Distribution Statement A: Approved for public release. Distribution is unlimited. View this GCN Circular online at https://gcn.nasa.gov/circulars/42601. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 40663] GRB 250920C: TERI Gamma-ray detection
by GCN Circulars 06 Nov '25

06 Nov '25

TITLE: GCN CIRCULAR NUMBER: 42600 SUBJECT: GRB 250920C: TERI Gamma-ray detection DATE: 25/11/06 15:48:20 GMT FROM: Daniel Shy <danielshy(a)danielshy.com> Daniel Shy (a), C.C. Cheung (a), Bernard Phlips (a), Michael Streicher (b), James Mason (b), Douglas M. Groves (b), Feng Zhang (b), Willy Kaye (b) (a) U.S. Naval Research Laboratory, 4555 Overlook Ave SW, Washington, DC 20375 (b) H3D, Inc., 812 Avis Dr., Ann Arbor, MI 48108, USA The cadmium zinc TElluride Radiation Imager (TERI) gamma-ray telescope [1], operating on the International Space Station, reports the detection of GRB 250920C, which was also detected by Fermi/GBM (GCN 41903, 41917), Swift/BAT (GCN 41904, 41924), SVOM (GCN 41929), and Konus-Wind (GCN 41957). Using 1 Hz binning and adopting T0 = 2025-09-20T15:25:17.06, we observe the three main peaks as seen in the Fermi/GBM lightcurve (GCN 41903) at ~T0+0.5s, ~T0+26.5, and ~T0+36.5s with respective peak excess count rates of roughly 35, 57, and 44 counts per second (cps) above the baseline rate observed in nearby off-source intervals. The analysis results presented here are preliminary and currently lack a detailed response function. TERI is an Office of Naval Research funded technology demonstrator for large-volume pixelated CdZnTe detectors developed, built, and operated by the U.S. Naval Research Laboratory (NRL) in conjunction with H3D, Inc. The pixelated CdZnTe detectors have an energy range of 40 keV to 3 MeV per pixel. It was launched on 2025 April 21 aboard the Department of Defense Space Test Program’s STP-H10 to the ISS. On the ISS, it is located on the SOX external payload facility on the Columbus module. Analysis of TERI data at NRL is supported under contract with NASA as correlative science for the Fermi Gamma-ray Space Telescope. [1] Shy, Daniel, et al. "Development of the cadmium zinc TElluride Radiation Imager." Journal of Astronomical Telescopes, Instruments, and Systems 10.4 (2024): 044009-044009 (arXiv:2408.04559). Distribution Statement A: Approved for public release. Distribution is unlimited. View this GCN Circular online at https://gcn.nasa.gov/circulars/42600. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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