March 2024 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 33830] Fermi trigger No 733092476: Global MASTER-Net observations report
by GCN Circulars 26 Mar '24

26 Mar '24

TITLE: GCN CIRCULAR NUMBER: 35977 SUBJECT: Fermi trigger No 733092476: Global MASTER-Net observations report DATE: 24/03/25 23:31:02 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko, G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gress, N.M. Budnev, O.Ershova (Irkutsk State University, API), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich (Blagoveschensk Educational State University) MASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB240325.87 (trigger No 733092476,23h 52m 16.08s , +12d 55m 58.8s, R=26.23) errorbox 2625 sec after notice time and 2658 sec after trigger time at 2024-03-25 21:32:10 UT, with upper limit up to 15.0 mag. Observations started at twilight. The observations began at zenith distance = 64 deg. The sun altitude is -13.7 deg. The galactic latitude b = -47 deg., longitude l = 102 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2406760 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 2689 | 2024-03-25 21:32:10 | MASTER-Tunka | (22h 40m 57.63s , +34d 24m 37.9s) | C | 60 | 14.7 | 2782 | 2024-03-25 21:33:43 | MASTER-Tunka | (22h 53m 51.34s , +30d 36m 29.5s) | C | 60 | 13.9 | 2876 | 2024-03-25 21:35:17 | MASTER-Tunka | (22h 28m 39.00s , +32d 33m 13.4s) | C | 60 | 15.0 | 2972 | 2024-03-25 21:36:53 | MASTER-Tunka | (22h 55m 29.91s , +36d 18m 16.9s) | C | 60 | 14.8 | 3647 | 2024-03-25 21:48:09 | MASTER-Tunka | (22h 41m 06.08s , +34d 25m 20.8s) | C | 60 | 14.6 | 3903 | 2024-03-25 21:52:24 | MASTER-Tunka | (22h 28m 41.31s , +32d 32m 29.2s) | C | 60 | 13.1 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/35977. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33829] GRB 240320A: Glowbug gamma-ray detection
by GCN Circulars 25 Mar '24

25 Mar '24

TITLE: GCN CIRCULAR NUMBER: 35976 SUBJECT: GRB 240320A: Glowbug gamma-ray detection DATE: 24/03/25 15:16:54 GMT FROM: C.C. Cheung at Naval Research Lab <Teddy.Cheung(a)nrl.navy.mil> 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: The Glowbug gamma-ray telescope [1,2], operating on the International Space Station, reports the detection of GRB 240320A, which was also detected by Fermi GBM (GCN 35967). Using an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2024-03-20 17:29:44.176 with a duration of 5.1 s and a total significance of about 14.9 sigma. The light curve comprises two primary peaks at ~T0+1s and ~T0+3.5s. Using a standard power-law function with an exponential high-energy cutoff [3] to model the emission over this duration results in a poorly constrained power-law index and a cutoff energy ("Epeak") of 191 keV. The modeled 10-10000 keV fluence is 4.5e-07 erg/cm^2. The analysis results presented here are preliminary and use a response function that lacks a detailed characterization of the surrounding passive structure of the ISS. Glowbug 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 Program’s 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. [1] Grove, J.E. et al. 2020, Proc. Yamada Conf. LXXI, arXiv:2009.11959 [2] Woolf, R.S. et al. 2022, Proc. SPIE, 12181, id. 121811O [3] Goldstein, A. et al. 2020, ApJ 895, 40, arXiv :1909.03006 Distribution Statement A: Approved for public release. Distribution is unlimited. View this GCN Circular online at https://gcn.nasa.gov/circulars/35976. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33828] Fermi trigger No 732937833: Global MASTER-Net observations report
by GCN Circulars 24 Mar '24

24 Mar '24

TITLE: GCN CIRCULAR NUMBER: 35975 SUBJECT: Fermi trigger No 732937833: Global MASTER-Net observations report DATE: 24/03/24 03:15:33 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko, G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gress, N.M. Budnev, O.Ershova (Irkutsk State University, API), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich (Blagoveschensk Educational State University) MASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB240324.08 (trigger No 732937833,02h 29m 16.08s , +14d 22m 58.8s, R=38.52) errorbox 831 sec after notice time and 866 sec after trigger time at 2024-03-24 02:04:54 UT, with upper limit up to 16.9 mag. The observations began at zenith distance = 79 deg. The sun altitude is -17.3 deg. The galactic latitude b = -42 deg., longitude l = 156 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2405607 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 896 | 2024-03-24 02:04:54 | MASTER-Tavrida | (01h 25m 47.74s , +48d 08m 11.3s) | C | 60 | 15.1 | 969 | 2024-03-24 02:06:07 | MASTER-Tavrida | (00h 58m 46.62s , +44d 22m 34.6s) | C | 60 | 16.0 | 1868 | 2024-03-24 02:21:06 | MASTER-Tavrida | (01h 25m 50.11s , +48d 10m 17.9s) | C | 60 | 16.2 | 1939 | 2024-03-24 02:22:17 | MASTER-Tavrida | (01h 37m 55.93s , +48d 08m 36.6s) | C | 60 | 15.3 | 2013 | 2024-03-24 02:23:31 | MASTER-Tavrida | (00h 58m 48.63s , +44d 22m 51.6s) | C | 60 | 16.3 | 2085 | 2024-03-24 02:24:43 | MASTER-Tavrida | (01h 09m 59.82s , +44d 21m 59.0s) | C | 60 | 16.2 | 2829 | 2024-03-24 02:37:07 | MASTER-Tavrida | (01h 25m 52.02s , +48d 10m 01.1s) | C | 60 | 16.4 | 2901 | 2024-03-24 02:38:19 | MASTER-Tavrida | (01h 37m 53.09s , +48d 08m 52.6s) | C | 60 | 16.0 | 2975 | 2024-03-24 02:39:33 | MASTER-Tavrida | (00h 58m 48.05s , +44d 22m 02.3s) | C | 60 | 16.9 | 3047 | 2024-03-24 02:40:45 | MASTER-Tavrida | (01h 10m 01.77s , +44d 23m 09.0s) | C | 60 | 16.0 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/35975. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33827] GRB 240318A: Fermi GBM Observation
by GCN Circulars 21 Mar '24

21 Mar '24

TITLE: GCN CIRCULAR NUMBER: 35974 SUBJECT: GRB 240318A: Fermi GBM Observation DATE: 24/03/21 21:31:30 GMT FROM: Lorenzo Scotton at UAH <lscottongcn(a)outlook.com> L. Scotton (UAH) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 02:51:01.82 UT on 18 March 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240318A (trigger 732423066/240318119), which was also detected by Glowbug (Cheung et al. 2024, GCN 35959) and Swift/BAT-GUANO (DeLaunay et al. 2024, GCN 35969). The Fermi GBM Final Real-time Localization was provided in GCN 35949. The angle from the Fermi LAT boresight is 53 degrees. The GBM light curve consists of a single emission episode with a duration (T90) of about 8 s (50-300 keV). The time-averaged spectrum from T0-2.0 to T0+11.0 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.5 +/- 0.2 and the cutoff energy, parameterized as Epeak, is 112 +/- 8 keV. The event fluence (10-1000 keV) in this time interval is (2.1 +/- 0.1)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+1.1 s in the 10-1000 keV band is 4.5 +/- 0.3 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/" View this GCN Circular online at https://gcn.nasa.gov/circulars/35974. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33826] Fermi GRB 240320A: Global MASTER-Net observations report
by GCN Circulars 21 Mar '24

21 Mar '24

TITLE: GCN CIRCULAR NUMBER: 35973 SUBJECT: Fermi GRB 240320A: Global MASTER-Net observations report DATE: 24/03/21 17:46:02 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko, G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gress, N.M. Budnev, O.Ershova (Irkutsk State University, API), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich (Blagoveschensk Educational State University) MASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB 240320A ( Fermi GBM team, GCN 35967) errorbox 69145 sec after notice time and 69181 sec after trigger time at 2024-03-21 12:42:48 UT, with upper limit up to 18.2 mag. Observations started at twilight. The observations began at zenith distance = 15 deg. The sun altitude is -13.5 deg. MASTER-Amur robotic telescope located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the Fermi GRB 240320A errorbox 80725 sec after notice time and 80760 sec after trigger time at 2024-03-21 15:55:48 UT, with upper limit up to 17.3 mag. The observations began at zenith distance = 30 deg. The sun altitude is -39.4 deg. The galactic latitude b = 45 deg., longitude l = 148 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2403375 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 69211 | 2024-03-21 12:42:48 | MASTER-Tunka | (09h 10m 24.61s , +52d 39m 34.5s) | C | 60 | 14.4 | 69335 | 2024-03-21 12:44:52 | MASTER-Tunka | (09h 11m 55.93s , +50d 44m 36.9s) | C | 60 | 14.3 | Coadd 69600 | 2024-03-21 12:49:17 | MASTER-Tunka | (08h 45m 24.19s , +52d 40m 17.4s) | C | 60 | 15.9 | Coadd 69698 | 2024-03-21 12:50:55 | MASTER-Tunka | (09h 09m 31.06s , +54d 32m 15.0s) | C | 60 | 16.5 | Coadd 69797 | 2024-03-21 12:52:34 | MASTER-Tunka | (08h 45m 26.41s , +52d 40m 09.6s) | C | 60 | 16.9 | Coadd 70044 | 2024-03-21 12:56:41 | MASTER-Tunka | (09h 35m 38.76s , +54d 33m 26.0s) | C | 60 | 16.1 | Coadd 70162 | 2024-03-21 12:58:40 | MASTER-Tunka | (08h 43m 21.21s , +54d 33m 41.9s) | C | 60 | 15.6 | Coadd 70282 | 2024-03-21 13:00:39 | MASTER-Tunka | (09h 35m 39.14s , +54d 31m 37.8s) | C | 60 | 14.8 | Coadd 71463 | 2024-03-21 13:20:20 | MASTER-Tunka | (09h 13m 48.63s , +48d 52m 15.6s) | C | 60 | 13.9 | Coadd 71922 | 2024-03-21 13:28:19 | MASTER-Tunka | (08h 35m 26.53s , +60d 30m 49.8s) | C | 20 | 18.2 | 72059 | 2024-03-21 13:30:16 | MASTER-Tunka | (08h 49m 27.90s , +60d 06m 51.9s) | C | 60 | 12.8 | Coadd 72144 | 2024-03-21 13:31:41 | MASTER-Tunka | (09h 12m 34.32s , +60d 05m 50.6s) | C | 60 | 17.6 | Coadd 72230 | 2024-03-21 13:33:07 | MASTER-Tunka | (08h 44m 16.89s , +59d 00m 23.4s) | C | 60 | 14.7 | Coadd 72313 | 2024-03-21 13:34:30 | MASTER-Tunka | (08h 49m 20.66s , +58d 52m 02.7s) | C | 60 | 12.9 | Coadd 80766 | 2024-03-21 15:55:48 | MASTER-Amur | (09h 02m 06.67s , +67d 36m 52.7s) | C | 10 | 15.8 | 80766 | 2024-03-21 15:55:48 | MASTER-Amur | (09h 01m 59.37s , +67d 58m 27.7s) | C | 10 | 16.1 | 80805 | 2024-03-21 15:56:27 | MASTER-Amur | (09h 02m 06.57s , +67d 35m 07.2s) | C | 10 | 15.8 | 80805 | 2024-03-21 15:56:27 | MASTER-Amur | (09h 01m 59.52s , +67d 56m 43.7s) | C | 10 | 16.0 | 80834 | 2024-03-21 15:56:56 | MASTER-Amur | (08h 41m 37.71s , +67d 35m 50.6s) | C | 10 | 15.8 | 80834 | 2024-03-21 15:56:56 | MASTER-Amur | (08h 41m 31.44s , +67d 57m 26.9s) | C | 10 | 16.0 | 80864 | 2024-03-21 15:57:26 | MASTER-Amur | (08h 41m 32.86s , +67d 34m 59.8s) | C | 10 | 15.7 | 80864 | 2024-03-21 15:57:26 | MASTER-Amur | (08h 41m 26.59s , +67d 56m 42.7s) | C | 10 | 15.9 | 80893 | 2024-03-21 15:57:55 | MASTER-Amur | (08h 41m 33.39s , +67d 35m 44.6s) | C | 10 | 15.8 | 80893 | 2024-03-21 15:57:55 | MASTER-Amur | (08h 41m 27.16s , +67d 57m 27.9s) | C | 10 | 15.9 | 80923 | 2024-03-21 15:58:25 | MASTER-Amur | (08h 41m 39.41s , +67d 34m 30.6s) | C | 10 | 15.8 | 80923 | 2024-03-21 15:58:25 | MASTER-Amur | (08h 41m 33.20s , +67d 56m 14.3s) | C | 10 | 16.1 | 80963 | 2024-03-21 15:58:55 | MASTER-Amur | (08h 41m 33.61s , +67d 33m 14.3s) | C | 30 | 16.3 | 80963 | 2024-03-21 15:58:55 | MASTER-Amur | (08h 41m 27.54s , +67d 54m 59.0s) | C | 30 | 16.6 | 81013 | 2024-03-21 15:59:45 | MASTER-Amur | (08h 41m 40.23s , +67d 35m 41.2s) | C | 30 | 15.4 | 81013 | 2024-03-21 15:59:45 | MASTER-Amur | (08h 41m 34.15s , +67d 57m 26.4s) | C | 30 | 15.7 | 81062 | 2024-03-21 16:00:34 | MASTER-Amur | (08h 41m 37.02s , +67d 36m 44.4s) | C | 30 | 15.8 | 81062 | 2024-03-21 16:00:34 | MASTER-Amur | (08h 41m 30.97s , +67d 58m 30.1s) | C | 30 | 16.3 | 81127 | 2024-03-21 16:01:24 | MASTER-Amur | (08h 41m 37.50s , +67d 34m 57.2s) | C | 60 | 15.5 | 81127 | 2024-03-21 16:01:24 | MASTER-Amur | (08h 41m 31.42s , +67d 56m 43.6s) | C | 60 | 16.0 | 81207 | 2024-03-21 16:02:44 | MASTER-Amur | (08h 41m 42.72s , +67d 35m 45.5s) | C | 60 | 15.5 | 81207 | 2024-03-21 16:02:44 | MASTER-Amur | (08h 41m 36.68s , +67d 57m 33.0s) | C | 60 | 16.0 | 81287 | 2024-03-21 16:04:05 | MASTER-Amur | (08h 41m 37.54s , +67d 34m 19.1s) | C | 60 | 15.5 | 81287 | 2024-03-21 16:04:05 | MASTER-Amur | (08h 41m 32.01s , +67d 56m 06.4s) | C | 60 | 15.8 | 82177 | 2024-03-21 16:18:54 | MASTER-Amur | (08h 41m 37.32s , +67d 59m 35.7s) | C | 60 | 17.3 | 82177 | 2024-03-21 16:18:54 | MASTER-Amur | (08h 41m 47.95s , +67d 37m 53.7s) | C | 60 | 16.6 | 82257 | 2024-03-21 16:20:14 | MASTER-Amur | (08h 41m 43.13s , +67d 58m 37.2s) | C | 60 | 17.2 | 82257 | 2024-03-21 16:20:14 | MASTER-Amur | (08h 41m 53.19s , +67d 36m 50.6s) | C | 60 | 16.6 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/35973. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33825] Konus-Wind detection of GRB 240315C (possible counterpart of EP240315a)
by GCN Circulars 21 Mar '24

21 Mar '24

TITLE: GCN CIRCULAR NUMBER: 35972 SUBJECT: Konus-Wind detection of GRB 240315C (possible counterpart of EP240315a) DATE: 24/03/21 16:05:26 GMT FROM: Dmitry Svinkin at Ioffe Institute <svinkin(a)mail.ioffe.ru> D. Svinkin, D. Frederiks, A.Lysenko, A. Ridnaia, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The long-duration GRB 240315C (IPN triangulation: Svinkin et al., GCN 35966; Swift-BAT detection: DeLaunay et al., GCN 35971) was detected by Konus-Wind (KW) in the waiting mode at T0=73018 s UT (20:16:58). The burst was observed over the high and variable background due to a solar particle event. A Bayesian block analysis of the KW waiting mode data in the 20-1600 keV band reveals a >20 sigma count rate increase in the interval from T0 to T0+47 s. The burst light curve shows a multi-peaked structure with the brightest peak around ~T0+24 s (we note a 6 s gap in the data starting from ~T0+47 s). The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB240315_T73000/ The spectrum of the burst, measured from T0 to T0+47 s, can be described by a power law with exponential cutoff (CPL) model dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -1.09(-0.25,+0.36) and Ep = 410(-159,+388) keV. The spectrum near the peak count rate, measured from T0+15 s to T0+29 s, can be described by a CPL model with alpha = -0.80(-0.30,+0.38) and Ep = 459(-155,+304) keV. The total burst fluence is 1.63(-0.40,+0.64)x10^-5 erg/cm^2, and the 2.944 s peak energy flux, measured from T0+23 s, is 9.13(-2.84,+3.65)x10^-7 erg/cm^2. (both in the 20 keV - 10 MeV energy range). The burst was detected ~374 s after the start time of the fast X-ray transient EP240315a (T0(EP)=20:10:44 UT; Zhang et al., GCN 35931) and during the ~1600 s interval of the transient activity. The positional (GCN 35966) and temporal coincidence of this burst with the transient supports the conclusion that the EP240315a is the GRB counterpart. Dimmer emission episodes of GRB 240315C may be missed by Konus-Wind due to the high and variable background. Assuming GRB 240315C is indeed connected with EP240315a at redshift z=4.859 (Saccardi et al., GCN 35936; Quirola-Vásquez et al., GCN 35960) and a standard cosmology model with H_0 = 67.3 km/s/Mpc, Omega_M = 0.315, and Omega_Lambda = 0.685 (Planck Collaboration, 2014), we estimate the following rest-frame parameters: the isotropic energy release E_iso is 7.1(-1.7,+2.8)x10^53 erg, the peak luminosity L_iso is 2.3(-0.7,+0.9)x10^53 erg/s, and the rest-frame peak energies of the time-integrated and peak spectra, Ep,i,z = 2402(-932,+2273) keV and Ep,p,z = 2689(-902,+1781) keV, respectively. With the obtained estimates, GRB 240315C is inside 90% prediction band for the 'Amati' relation and inside 90% prediction band for the 'Yonetoku' relation derived for the sample of >300 long KW GRBs with known redshifts (Tsvetkova et al., 2017; Tsvetkova et al., 2021), see http://www.ioffe.ru/LEA/GRBs/GRB240315_T73000/GRB240315C_rest_frame.pdf View this GCN Circular online at https://gcn.nasa.gov/circulars/35972. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33824] GRB 240315C / X-ray transient EP240315a: Swift/BAT detection
by GCN Circulars 21 Mar '24

21 Mar '24

TITLE: GCN CIRCULAR NUMBER: 35971 SUBJECT: GRB 240315C / X-ray transient EP240315a: Swift/BAT detection DATE: 24/03/21 15:47:43 GMT FROM: Jimmy DeLaunay at Penn State <delauj2(a)gmail.com> James DeLaunay (PSU), Aaron Tohuvavohu (U Toronto), Dmitry Svinkin (Ioffe Institute), Samuele Ronchini (PSU), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report: Swift/BAT did not localize GRB 240315C onboard (T0: 2024-03-15T20:10:44 UTC, EP240315a GCN 35931, GRB 240315C GCN 35966). Swift/BAT detects the emission starting at ~T0 + 350 s and lasts for ~70 s. The rates data shows the emission through all energy bins, ranging from 15 keV to 350 keV. No formal spectral analysis has been performed, but the hardness seems to be in the typical range for GRBs. No event mode or survey mode data was available at the time due to being in a slew, so no imaging localization is possible. View this GCN Circular online at https://gcn.nasa.gov/circulars/35971. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33823] Fermi trigger No 732657380: Global MASTER-Net observations report
by GCN Circulars 21 Mar '24

21 Mar '24

TITLE: GCN CIRCULAR NUMBER: 35970 SUBJECT: Fermi trigger No 732657380: Global MASTER-Net observations report DATE: 24/03/21 15:45:44 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko, G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gress, N.M. Budnev, O.Ershova (Irkutsk State University, API), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich (Blagoveschensk Educational State University) MASTER-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 GRB240320.83 (trigger No 732657380,18h 20m 40.80s , -34d 13m 12.0s, R=3.14) errorbox 9088 sec after trigger time at 2024-03-20 22:27:43 UT, with upper limit up to 17.0 mag. The observations began at zenith distance = 78 deg. The sun altitude is -57.9 deg. The galactic latitude b = -10 deg., longitude l = 359 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2403918 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 9119 | 2024-03-20 22:27:43 | MASTER-SAAO | (18h 28m 13.21s , -38d 52m 59.6s) | C | 60 | 16.6 | 9119 | 2024-03-20 22:27:43 | MASTER-SAAO | (18h 25m 58.91s , -38d 40m 19.5s) | C | 60 | 17.0 | 9199 | 2024-03-20 22:29:03 | MASTER-SAAO | (18h 19m 02.96s , -37d 00m 13.3s) | C | 60 | 16.3 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/35970. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33822] GRB 240318A: Swift/BAT-GUANO detection of a burst outside the coded FOV
by GCN Circulars 21 Mar '24

21 Mar '24

TITLE: GCN CIRCULAR NUMBER: 35969 SUBJECT: GRB 240318A: Swift/BAT-GUANO detection of a burst outside the coded FOV DATE: 24/03/21 14:50:33 GMT FROM: Jimmy DeLaunay at Penn State <delauj2(a)gmail.com> James DeLaunay (PSU), Samuele Ronchini (PSU), Gayathri Raman (PSU), Aaron Tohuvavohu (U Toronto), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report: Swift/BAT did not localize GRB 240318A onboard (T0: 2024-03-18T02:51:01.82 UTC, Fermi trig 732423066) The 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). Upon 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. The 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 69.4 in a 4.096 s analysis time bin, starting at T0. NITRATES results are consistent with a burst coming from outside the FOV, with DeltaLLHOut of -292. See Section 9.1 and Figures 10 and 17 in the NITRATES paper for brief descriptions and interpretation of sqrt(TS), DeltaLLHPeak, and DeltaLLHOut. GUANO 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. A live reporting of Swift/BAT event data recovered by GUANO can be found at: https://www.swift.psu.edu/guano/ View this GCN Circular online at https://gcn.nasa.gov/circulars/35969. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 33821] X-ray transient EP240315a: ATCA detection of radio counterpart
by GCN Circulars 20 Mar '24

20 Mar '24

TITLE: GCN CIRCULAR NUMBER: 35968 SUBJECT: X-ray transient EP240315a: ATCA detection of radio counterpart DATE: 24/03/20 22:45:33 GMT FROM: James Leung at U. Toronto / HUJI <jamesk.leung(a)utoronto.ca> J. K. Leung (U. Toronto/HUJI), R. Ricci (INAF-IRA), D. Dobie (Swinburne/OzGrav), E. Troja (U. Rome) We observed the field of AT2024eju (Srivastav et al., GCN35932), the likely optical counterpart to the fast X-ray transient EP240315a (Zhang et al., GCN35931), with the Australia Telescope Compact Array (ATCA) under project code CX564. The observations were taken on two consecutive days, from 2024-03-19 06:30 UT to 2024-03-19 09:00 UT and from 2024-03-20 06:30 UT to 2024-03-20 09:30 UT, both at 5.5 and 9 GHz. In our preliminary analysis, we detect a radio source at both 5.5 and 9 GHz, with a flux density of ~0.1mJy. The position of the source is consistent with that of EP240315a (Zhang et al., GCN35931), AT2024eju (Srivastav et al., GCN35932), and the radio counterpart detected at 3 GHz by MeerKAT (Carotenuto et al., GCN35961). Further ATCA observations are planned. We thank the CSIRO Space and Astronomy staff, in particular Jamie Stevens, for supporting these observations in a timely manner. We acknowledge the Gomeroi people as the traditional owners of the Observatory site. The Australia Telescope Compact Array is part of the Australia Telescope National Facility (https://ror.org/05qajvd42) which is funded by the Australian Government for operation as a National Facility managed by CSIRO. View this GCN Circular online at https://gcn.nasa.gov/circulars/35968. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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