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

[vsnet-grb-info 34955] Fermi trigger No 744629911: Global MASTER-Net observations report
by GCN Circulars 06 Aug '24

06 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37082 SUBJECT: Fermi trigger No 744629911: Global MASTER-Net observations report DATE: 24/08/06 20:00:43 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 GRB240806.40 (trigger No 744629911,15h 07m 04.80s , +55d 55m 12.0s, R=1.09) errorbox 29824 sec after notice time and 29855 sec after trigger time at 2024-08-06 17:56:01 UT, with upper limit up to 19.4 mag. Observations started at twilight. The observations began at zenith distance = 25 deg. The sun altitude is -9.6 deg. The galactic latitude b = 52 deg., longitude l = 92 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2552751 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 29885 | 2024-08-06 17:56:01 | MASTER-Tavrida | (14h 54m 59.27s , +55d 34m 38.1s) | C | 60 | 16.8 | 29885 | 2024-08-06 17:56:01 | MASTER-Tavrida | (14h 55m 04.53s , +55d 30m 57.4s) | C | 60 | 17.3 | 29961 | 2024-08-06 17:57:17 | MASTER-Tavrida | (15h 09m 01.47s , +55d 33m 36.0s) | C | 60 | 16.7 | 29962 | 2024-08-06 17:57:17 | MASTER-Tavrida | (15h 09m 06.71s , +55d 29m 54.0s) | C | 60 | 16.9 | 30035 | 2024-08-06 17:58:31 | MASTER-Tavrida | (15h 02m 04.84s , +54d 17m 30.6s) | C | 60 | 17.0 | 30035 | 2024-08-06 17:58:31 | MASTER-Tavrida | (15h 02m 10.13s , +54d 13m 48.1s) | C | 60 | 17.2 | 30110 | 2024-08-06 17:59:46 | MASTER-Tavrida | (15h 15m 47.61s , +54d 16m 15.4s) | C | 60 | 16.7 | 30110 | 2024-08-06 17:59:46 | MASTER-Tavrida | (15h 15m 52.82s , +54d 12m 55.9s) | C | 60 | 16.7 | 30184 | 2024-08-06 18:01:00 | MASTER-Tavrida | (15h 06m 45.25s , +56d 52m 47.3s) | C | 60 | 17.0 | 30184 | 2024-08-06 18:01:00 | MASTER-Tavrida | (15h 06m 51.21s , +56d 49m 27.2s) | C | 60 | 17.1 | 30266 | 2024-08-06 18:02:22 | MASTER-Tavrida | (15h 21m 24.59s , +56d 53m 41.0s) | C | 60 | 17.4 | 30266 | 2024-08-06 18:02:22 | MASTER-Tavrida | (15h 21m 30.56s , +56d 50m 20.0s) | C | 60 | 17.4 | 30340 | 2024-08-06 18:03:36 | MASTER-Tavrida | (15h 13m 17.88s , +55d 33m 45.0s) | C | 60 | 17.3 | 30340 | 2024-08-06 18:03:36 | MASTER-Tavrida | (15h 13m 23.75s , +55d 30m 23.4s) | C | 60 | 17.5 | 30415 | 2024-08-06 18:04:50 | MASTER-Tavrida | (15h 27m 32.39s , +55d 34m 04.2s) | C | 60 | 17.5 | 30415 | 2024-08-06 18:04:51 | MASTER-Tavrida | (15h 27m 38.20s , +55d 30m 42.3s) | C | 60 | 17.5 | 30491 | 2024-08-06 18:06:07 | MASTER-Tavrida | (14h 47m 46.51s , +56d 52m 08.2s) | C | 60 | 17.2 | 30491 | 2024-08-06 18:06:07 | MASTER-Tavrida | (14h 47m 53.06s , +56d 48m 45.2s) | C | 60 | 17.5 | 30565 | 2024-08-06 18:07:21 | MASTER-Tavrida | (15h 02m 28.50s , +56d 53m 40.0s) | C | 60 | 16.3 | 30565 | 2024-08-06 18:07:21 | MASTER-Tavrida | (15h 02m 35.04s , +56d 50m 17.0s) | C | 60 | 16.2 | 30640 | 2024-08-06 18:08:35 | MASTER-Tavrida | (15h 00m 15.69s , +58d 11m 46.9s) | C | 60 | 17.4 | 30640 | 2024-08-06 18:08:35 | MASTER-Tavrida | (15h 00m 22.68s , +58d 08m 23.7s) | C | 60 | 17.5 | 30714 | 2024-08-06 18:09:50 | MASTER-Tavrida | (15h 15m 32.48s , +58d 10m 38.3s) | C | 60 | 17.9 | 30714 | 2024-08-06 18:09:50 | MASTER-Tavrida | (15h 15m 39.41s , +58d 07m 14.7s) | C | 60 | 18.1 | 30790 | 2024-08-06 18:11:06 | MASTER-Tavrida | (14h 54m 54.09s , +55d 33m 52.2s) | C | 60 | 17.9 | 30790 | 2024-08-06 18:11:06 | MASTER-Tavrida | (14h 55m 00.64s , +55d 30m 24.9s) | C | 60 | 17.9 | 30865 | 2024-08-06 18:12:20 | MASTER-Tavrida | (15h 09m 09.75s , +55d 34m 08.0s) | C | 60 | 17.8 | 30865 | 2024-08-06 18:12:20 | MASTER-Tavrida | (15h 09m 16.24s , +55d 30m 40.2s) | C | 60 | 17.9 | 30939 | 2024-08-06 18:13:35 | MASTER-Tavrida | (15h 02m 06.43s , +54d 17m 46.3s) | C | 60 | 18.1 | 30939 | 2024-08-06 18:13:35 | MASTER-Tavrida | (15h 02m 12.77s , +54d 14m 18.8s) | C | 60 | 18.2 | 31013 | 2024-08-06 18:14:49 | MASTER-Tavrida | (15h 15m 48.98s , +54d 15m 45.2s) | C | 60 | 17.8 | 31013 | 2024-08-06 18:14:49 | MASTER-Tavrida | (15h 15m 55.19s , +54d 12m 18.3s) | C | 60 | 17.8 | 31088 | 2024-08-06 18:16:04 | MASTER-Tavrida | (15h 06m 53.03s , +56d 53m 36.7s) | C | 60 | 18.0 | 31088 | 2024-08-06 18:16:04 | MASTER-Tavrida | (15h 06m 59.97s , +56d 50m 09.3s) | C | 60 | 18.1 | 31243 | 2024-08-06 18:18:39 | MASTER-Tavrida | (14h 58m 03.68s , +54d 16m 44.3s) | C | 60 | 18.1 | 31243 | 2024-08-06 18:18:39 | MASTER-Tavrida | (14h 58m 10.20s , +54d 13m 17.2s) | C | 60 | 18.0 | 31318 | 2024-08-06 18:19:54 | MASTER-Tavrida | (15h 21m 27.20s , +56d 51m 26.8s) | C | 60 | 16.0 | 31319 | 2024-08-06 18:19:54 | MASTER-Tavrida | (15h 21m 34.07s , +56d 47m 59.7s) | C | 60 | 15.9 | 31393 | 2024-08-06 18:21:09 | MASTER-Tavrida | (15h 13m 26.34s , +55d 33m 53.3s) | C | 60 | 17.8 | 31393 | 2024-08-06 18:21:09 | MASTER-Tavrida | (15h 13m 33.09s , +55d 30m 25.3s) | C | 60 | 17.8 | 31469 | 2024-08-06 18:22:24 | MASTER-Tavrida | (15h 27m 31.89s , +55d 35m 02.8s) | C | 60 | 18.3 | 31469 | 2024-08-06 18:22:25 | MASTER-Tavrida | (15h 27m 38.52s , +55d 31m 34.3s) | C | 60 | 18.6 | 31545 | 2024-08-06 18:23:41 | MASTER-Tavrida | (14h 47m 48.89s , +56d 51m 49.2s) | C | 60 | 15.2 | 31546 | 2024-08-06 18:23:41 | MASTER-Tavrida | (14h 47m 56.21s , +56d 48m 19.8s) | C | 60 | 15.1 | 31620 | 2024-08-06 18:24:56 | MASTER-Tavrida | (15h 02m 29.77s , +56d 53m 10.8s) | C | 60 | 17.7 | 31620 | 2024-08-06 18:24:56 | MASTER-Tavrida | (15h 02m 37.01s , +56d 49m 41.2s) | C | 60 | 17.7 | 31694 | 2024-08-06 18:26:10 | MASTER-Tavrida | (15h 00m 16.46s , +58d 10m 34.8s) | C | 60 | 18.4 | 31694 | 2024-08-06 18:26:10 | MASTER-Tavrida | (15h 00m 24.10s , +58d 07m 05.0s) | C | 60 | 18.4 | 31768 | 2024-08-06 18:27:24 | MASTER-Tavrida | (15h 15m 28.89s , +58d 11m 24.1s) | C | 60 | 18.8 | 31768 | 2024-08-06 18:27:24 | MASTER-Tavrida | (15h 15m 36.43s , +58d 07m 54.2s) | C | 60 | 18.8 | 31843 | 2024-08-06 18:28:39 | MASTER-Tavrida | (14h 55m 01.93s , +55d 34m 38.4s) | C | 60 | 17.4 | 31843 | 2024-08-06 18:28:39 | MASTER-Tavrida | (14h 55m 09.00s , +55d 31m 08.5s) | C | 60 | 17.5 | 31918 | 2024-08-06 18:29:54 | MASTER-Tavrida | (15h 09m 06.73s , +55d 33m 27.7s) | C | 60 | 18.2 | 31918 | 2024-08-06 18:29:54 | MASTER-Tavrida | (15h 09m 13.68s , +55d 29m 57.8s) | C | 60 | 18.2 | 31992 | 2024-08-06 18:31:07 | MASTER-Tavrida | (15h 02m 12.37s , +54d 15m 56.9s) | C | 60 | 18.9 | 31992 | 2024-08-06 18:31:07 | MASTER-Tavrida | (15h 02m 19.07s , +54d 12m 27.4s) | C | 60 | 18.9 | 32078 | 2024-08-06 18:32:34 | MASTER-Tavrida | (15h 15m 51.26s , +54d 16m 52.7s) | C | 60 | 18.7 | 32079 | 2024-08-06 18:32:34 | MASTER-Tavrida | (15h 15m 57.89s , +54d 13m 23.3s) | C | 60 | 18.6 | 32153 | 2024-08-06 18:33:48 | MASTER-Tavrida | (15h 06m 52.82s , +56d 51m 48.0s) | C | 60 | 19.0 | 32153 | 2024-08-06 18:33:49 | MASTER-Tavrida | (15h 07m 00.11s , +56d 48m 18.0s) | C | 60 | 18.9 | 32304 | 2024-08-06 18:36:19 | MASTER-Tavrida | (14h 57m 59.16s , +54d 16m 30.1s) | C | 60 | 19.2 | 32304 | 2024-08-06 18:36:19 | MASTER-Tavrida | (14h 58m 05.88s , +54d 13m 00.6s) | C | 60 | 19.2 | 32379 | 2024-08-06 18:37:35 | MASTER-Tavrida | (15h 21m 28.57s , +56d 53m 10.0s) | C | 60 | 18.8 | 32379 | 2024-08-06 18:37:35 | MASTER-Tavrida | (15h 21m 35.64s , +56d 49m 40.3s) | C | 60 | 19.0 | 32455 | 2024-08-06 18:38:50 | MASTER-Tavrida | (15h 13m 27.64s , +55d 34m 16.2s) | C | 60 | 18.8 | 32455 | 2024-08-06 18:38:50 | MASTER-Tavrida | (15h 13m 34.43s , +55d 30m 45.5s) | C | 60 | 18.8 | 32529 | 2024-08-06 18:40:05 | MASTER-Tavrida | (15h 27m 32.35s , +55d 33m 04.8s) | C | 60 | 19.0 | 32529 | 2024-08-06 18:40:05 | MASTER-Tavrida | (15h 27m 38.99s , +55d 29m 34.4s) | C | 60 | 18.9 | 32606 | 2024-08-06 18:41:22 | MASTER-Tavrida | (14h 47m 55.88s , +56d 51m 50.4s) | C | 60 | 19.0 | 32606 | 2024-08-06 18:41:22 | MASTER-Tavrida | (14h 48m 03.18s , +56d 48m 19.0s) | C | 60 | 19.0 | 32681 | 2024-08-06 18:42:37 | MASTER-Tavrida | (15h 02m 30.65s , +56d 53m 14.6s) | C | 60 | 19.1 | 32681 | 2024-08-06 18:42:37 | MASTER-Tavrida | (15h 02m 37.82s , +56d 49m 43.5s) | C | 60 | 19.1 | 32755 | 2024-08-06 18:43:51 | MASTER-Tavrida | (15h 00m 23.60s , +58d 09m 38.2s) | C | 60 | 19.0 | 32755 | 2024-08-06 18:43:51 | MASTER-Tavrida | (15h 00m 31.13s , +58d 06m 06.7s) | C | 60 | 19.0 | 32928 | 2024-08-06 18:46:44 | MASTER-Tavrida | (15h 05m 25.57s , +52d 58m 17.4s) | C | 60 | 18.8 | 32928 | 2024-08-06 18:46:44 | MASTER-Tavrida | (15h 05m 31.91s , +52d 54m 45.5s) | C | 60 | 19.0 | 33002 | 2024-08-06 18:47:58 | MASTER-Tavrida | (15h 09m 23.99s , +52d 57m 33.1s) | C | 60 | 18.8 | 33002 | 2024-08-06 18:47:58 | MASTER-Tavrida | (15h 09m 30.25s , +52d 54m 02.3s) | C | 60 | 18.8 | 33227 | 2024-08-06 18:51:43 | MASTER-Tavrida | (14h 58m 08.47s , +54d 17m 02.4s) | C | 60 | 19.3 | 33227 | 2024-08-06 18:51:43 | MASTER-Tavrida | (14h 58m 15.04s , +54d 13m 31.9s) | C | 60 | 19.3 | 33303 | 2024-08-06 18:52:58 | MASTER-Tavrida | (15h 19m 57.34s , +54d 16m 58.4s) | C | 60 | 18.7 | 33303 | 2024-08-06 18:52:58 | MASTER-Tavrida | (15h 20m 03.74s , +54d 13m 28.4s) | C | 60 | 18.8 | 33529 | 2024-08-06 18:56:45 | MASTER-Tavrida | (14h 50m 49.28s , +55d 35m 15.3s) | C | 60 | 19.4 | 33529 | 2024-08-06 18:56:45 | MASTER-Tavrida | (14h 50m 56.28s , +55d 31m 45.2s) | C | 60 | 19.4 | 33687 | 2024-08-06 18:59:23 | MASTER-Tavrida | (14h 55m 50.26s , +58d 10m 11.6s) | C | 60 | 18.8 | 33687 | 2024-08-06 18:59:23 | MASTER-Tavrida | (14h 55m 57.91s , +58d 06m 41.4s) | C | 60 | 19.0 | 33843 | 2024-08-06 19:01:59 | MASTER-Tavrida | (15h 05m 27.02s , +52d 58m 04.4s) | C | 60 | 17.1 | 33843 | 2024-08-06 19:01:59 | MASTER-Tavrida | (15h 05m 33.37s , +52d 54m 34.5s) | C | 60 | 17.1 | 33917 | 2024-08-06 19:03:13 | MASTER-Tavrida | (15h 09m 19.73s , +52d 56m 59.7s) | C | 60 | 17.6 | 33917 | 2024-08-06 19:03:13 | MASTER-Tavrida | (15h 09m 25.99s , +52d 53m 29.9s) | C | 60 | 17.6 | 34067 | 2024-08-06 19:05:43 | MASTER-Tavrida | (15h 20m 11.32s , +58d 09m 06.9s) | C | 60 | 18.2 | 34067 | 2024-08-06 19:05:43 | MASTER-Tavrida | (15h 20m 18.50s , +58d 05m 37.0s) | C | 60 | 18.4 | 34216 | 2024-08-06 19:08:12 | MASTER-Tavrida | (15h 20m 01.28s , +54d 15m 46.5s) | C | 60 | 18.0 | 34217 | 2024-08-06 19:08:12 | MASTER-Tavrida | (15h 20m 07.46s , +54d 12m 16.3s) | C | 60 | 18.1 | 34443 | 2024-08-06 19:11:59 | MASTER-Tavrida | (14h 50m 49.61s , +55d 33m 09.8s) | C | 60 | 18.9 | 34443 | 2024-08-06 19:11:59 | MASTER-Tavrida | (14h 50m 56.29s , +55d 29m 40.3s) | C | 60 | 19.1 | 34592 | 2024-08-06 19:14:27 | MASTER-Tavrida | (14h 55m 56.31s , +58d 10m 32.2s) | C | 60 | 18.8 | 34592 | 2024-08-06 19:14:27 | MASTER-Tavrida | (14h 56m 03.54s , +58d 07m 02.1s) | C | 60 | 19.0 | 34742 | 2024-08-06 19:16:58 | MASTER-Tavrida | (15h 26m 00.22s , +56d 51m 31.3s) | C | 60 | 18.6 | 34742 | 2024-08-06 19:16:58 | MASTER-Tavrida | (15h 26m 06.80s , +56d 48m 01.3s) | C | 60 | 18.7 | 34892 | 2024-08-06 19:19:28 | MASTER-Tavrida | (15h 05m 31.29s , +52d 57m 53.7s) | C | 60 | 16.4 | 34893 | 2024-08-06 19:19:28 | MASTER-Tavrida | (15h 05m 37.04s , +52d 54m 22.9s) | C | 60 | 16.5 | 34966 | 2024-08-06 19:20:42 | MASTER-Tavrida | (15h 09m 24.32s , +52d 56m 48.4s) | C | 60 | 16.8 | 34967 | 2024-08-06 19:20:42 | MASTER-Tavrida | (15h 09m 29.96s , +52d 53m 18.4s) | C | 60 | 17.1 | 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/37082. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34954] EP240804a (GRB 240804B): NOT optical observations
by GCN Circulars 06 Aug '24

06 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37081 SUBJECT: EP240804a (GRB 240804B): NOT optical observations DATE: 24/08/06 19:49:32 GMT FROM: Daniele B. Malesani at IMAPP / Radboud University <d.malesani(a)astro.ru.nl> D. B. Malesani (DAWN/NBI and Radboud Univ.), J. P. U. Fynbo (DAWN/NBI), J. Verwohlt (DARK/NBI), K. Valeckas (DAWN/NBI), T. Bach Johannessen (Aarhus Univ.), J. K. Mogensen (Aarhus Univ.), D. Xu (NAOC), S. Grund (NOT) report on behalf of a larger collaboration: We observed the optical counterpart (An et al., GCN 37035; Poidevin et al., GCN 37038; Bochenek et al., GCN 37039; Li et al., GCN 37044) of the X-ray transient EP240804a (Wang et al., GCN 37034), identified with GRB 240804B (Frederiks et al., GCN 37071). using the Nordic Optical Telescope equipped with the ALFOSC imager. A set of three 300-s r-band observations were carried out at large airmass (average 2.75), with mid time Aug 6.081 UT (28.34 hr after the EP trigger). The optical counterpart is well detected in the stack of our data, for which we measure r = 21.72 +- 0.08 (AB), calibrated against nearby stars from the SkyMapper catalog. View this GCN Circular online at https://gcn.nasa.gov/circulars/37081. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34953] EP240806a: LCOGT optical counterpart detection
by GCN Circulars 06 Aug '24

06 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37080 SUBJECT: EP240806a: LCOGT optical counterpart detection DATE: 24/08/06 19:14:23 GMT FROM: Ismael Perez-Fournon at Instituto de Astrofisica de Canarias <ipf(a)iac.es> I. Pérez-Fournon, F. Poidevin, D. S. Aguado, J. A. Acosta-Pulido, A. López-Oramas, D. Nespral (IAC and ULL), and F. Acero (CEA Saclay and IAC) We report on optical follow-up observations of the Einstein Probe (EP) fast X-ray transient EP240806a, detected by the EP Wide-field X-ray Telescope (WXT, Wu et al., GCN 3763) and by the EP Follow-up X-ray Telescope (FXT, Wang et al., GCN 37069), using one of the Las Cumbres Observatory Global Telescope Network (LCOGT) 1-m telescopes located at the McDonald Observatory (Texas) LCOGT node, with a single 300 sec exposure in the SDSS r filter. The observation started at 10:40:19 UT on 2024-08-06, i.e. 5.87 hr after the EP trigger. An uncatalogued source is detected at about 1.2 arcsec from the FXT position at the coordinates RA (J2000) = 00:45:56.679 Dec (J2000)= +05:05:39.64 with an uncertainty of ~ 0.4 arcsec, after astrometric calibration using Gaia DR3 stars, at r = 21.89 +/- 0.15 mag (AB), calibrated with Pan-STARRS stars in the field and not corrected for Galactic extinction. The position and r-band magnitude are consistent with the reports of Li et al. (GCN 37064) and Izzo and Malesani (GCN 37065), respectively. This work makes use of observations from the Las Cumbres Observatory global telescope network (program IAC2024B-004). View this GCN Circular online at https://gcn.nasa.gov/circulars/37080. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34952] Konus-Wind detection of GRB 240802A (EP240802a)
by GCN Circulars 06 Aug '24

06 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37079 SUBJECT: Konus-Wind detection of GRB 240802A (EP240802a) DATE: 24/08/06 17:04:23 GMT FROM: Dmitry Frederiks at Ioffe Institute <fred(a)mail.ioffe.ru> D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The long GRB 240802A (AstroSat CZTI detection: Waratkar et al., GCN 37018; SVOM/GRM observation: Wang et al., GCN 37022; IPN triangulation: Svinkin et al., GCN 37026; Kozyrev et al., GCN 37078), associated with the fast X-ray transient EP240802a (Wang et al., GCN 37019; Aryan et al., GCN 37021; Svinkin et al., GCN 37026; Kozyrev et al., GCN 37078), triggered Konus-Wind (KW) at T0=38048.482 s UT (10:34:08.482). The burst light curve shows a multi-peaked emission pulse, which starts at ~T0-13 s and has the total duration of ~47 s. Two main peaks in the light curve are located around ~T0 and ~T0+29 s, respectively. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB240802_T38048/ As observed by Konus-Wind, the burst had the total fluence of 1.63(-0.14,+0.15)x10^-5 erg/cm^2 and a 2.944-s peak energy flux, measured from T0+0.032 s, of 8.21(-2.63,+3.09)x10^-6 erg/cm^2/s (both in the 20 keV - 10 MeV energy range). Due to telemetry errors in the KW triggered-mode spectra, the spectral analysis was performed using the 3-channel waiting-mode count rates. Modeling the time-integrated spectrum (measured from T0-13.161 s to T0+33.943 s) by a power law with exponential cutoff (CPL) function dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) yields alpha = -1.38(-0.11, + 0.12) and Ep = 226(-36,+51) keV. A CPL fit to the spectrum near the peak count rate (measured from T0-1.385 s to T0+1.559 s) results in alpha = -1.02(-0.15,+0.17) and Ep = 273(-42,+55) keV. All the quoted errors are estimated at the 68% confidence level. All the presented results are preliminary. View this GCN Circular online at https://gcn.nasa.gov/circulars/37079. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34951] Improved IPN triangulation of GRB 240802A / EP 240802a
by GCN Circulars 06 Aug '24

06 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37078 SUBJECT: Improved IPN triangulation of GRB 240802A / EP 240802a DATE: 24/08/06 16:49:43 GMT FROM: Anna Ridnaia at Ioffe Institute <ridnaia(a)mail.ioffe.ru> A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin on behalf of the HEND/Mars Odyssey team, D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, E. Burns, on behalf of the IPN, E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, G. Waratkar, V. Jethwani, J.Joshi, V. Bhalerao, D. Bhattacharya, and S. Vadawale, on behalf of the Astrosat-CZTI team, and W. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr, and A.S. Gardner on on behalf of the GRS-Odyssey GRB team, report: Using the Mars-Odyssey (HEND) data we have improved the previous IPN error box (Svinkin et al., GCN 37026). The coordinates of the updated 3 sigma error box are: --------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 287.477 (19h 09m 54s) -1.718 ( -1d 43' 05") Corners: 285.131 (19h 00m 31s) +2.050 ( +2d 03' 01") 285.257 (19h 01m 02s) +2.088 ( +2d 05' 15") 289.523 (19h 18m 05s) -5.648 ( -5d 38' 51") 289.393 (19h 17m 34s) -5.668 ( -5d 40' 03") --------------------------------------------- The error box area is 1.11 sq. deg, and its maximum dimension is 8.9 deg (the minimum one is 7.6 arcmin). The Sun distance was 146 deg. The IPN localization may be further improved. The EP240802a localization is inside the improved box. Updated triangulation map and HEALPix FITS files are posted at http://www.ioffe.ru/LEA/GRBs/GRB240802_T38048/IPN/ The HEALPix triangulation map is the multi-order HEALPix in units of probability density. The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular. View this GCN Circular online at https://gcn.nasa.gov/circulars/37078. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34950] Konus-Wind detection of GRB 240805A
by GCN Circulars 06 Aug '24

06 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37077 SUBJECT: Konus-Wind detection of GRB 240805A DATE: 24/08/06 15:53:16 GMT FROM: Anna Ridnaia at Ioffe Institute <ridnaia(a)mail.ioffe.ru> A. Ridnaia, D. Frederiks, A. Lysenko, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The long-duration GRB 240805A (Fermi-GBM observation: The Fermi GBM team, GCN 27031; Godwin et al., GCN 37075; Swift-BAT detection: Dichiara et al., GCN 37032; INTEGRAL IBIS/ISGRI detection: Mereghetti et al., GCN 37037; Götz et al., GCN 37041; Fermi-LAT detection: Gupta et al., GCN 37042; SVOM/GRM observation: Wang et al., GCN 37054) triggered Konus-Wind at T0=7342.029 s UT (02:02:22.029). The burst light curve shows a multipeaked structure which starts at ~T0-2.3 s and has a total duration of ~15.6 s. The emission is seen up to ~4 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB240805_T07342/ As observed by Konus-Wind, the burst had a fluence of 3.43(-0.31,+0.35)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+3.680 s, of 6.61(-1.44,+1.48)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum of the burst (measured from T0 to T0+15.360 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.46(-0.11,+0.13), the high energy photon index beta = -2.76(-0.43,+0.26), the peak energy Ep = 272(-22,+22) keV (chi2 = 81/80 dof). The spectrum near the maximum count rate (measured from T0+0.256 to T0+7.168 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.51(-0.12,+0.14), the high energy photon index beta = -2.78(-0.61,+0.29), the peak energy Ep = 279(-26,+27) keV (chi2 = 70/71 dof). All the quoted errors are at the 90% confidence level. All the quoted values are preliminary. View this GCN Circular online at https://gcn.nasa.gov/circulars/37077. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34949] GRB 240805B Bassano Bresciano Observatory upper limit
by GCN Circulars 06 Aug '24

06 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37076 SUBJECT: GRB 240805B Bassano Bresciano Observatory upper limit DATE: 24/08/06 15:20:26 GMT FROM: Ulisse Quadri at Bassano Bresciano Observatory <osservatoriobassano(a)gmail.com> U.Quadri, L.Strabla and P.Madurini (Bassano Bresciano Astronomical Observatory), Members of: AAVSO - American Association of Variable Star Observers. UAI - Unione Astrofili Italiani/GRB section. GAC - Gruppo Astrofili Cremonesi. In a large collaboration with: M.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) report: We imaged the field of GRB 240805B detected by SWIFT (trigger num. 1246989) with the robotic telescope of (IAU station 565) Bassano Bresciano Observatory, Italy. The observations started 6.72 hour after the GRB trigger, At the end of twilight with our Newton telescope D=450 mm F/D=4.5. Weather conditions were good. We co-added 2 series of 50 exposures of 20 sec each. Start T0+ End T0+ Vlim 6.72 hour 7.02 hour 21.2 7.02 hour 7.35 hour 21.2 We did not found any optical counterpart in the error box of the XRTcandidate: M. A. Williams et al., GCN 37043; Z.P. Zhu et al., GCN 37050; V. Lipunov et al., GCN 37051; R. Strausbaugh et al., GCN 37052; A. Moskvitin et al., GCN 37055; Z. Maksut et al., GCN 37060; Guowang Du et al., GCN 37062; N. Pankov et al., GCN 37072. Magnitudes were estimated with the pan-STARRS cat. and are derived using Lupton (2005) equations. Not corrected for galactic dust extinction. Reference: http://www.osservatoriobassano.org/GRB.asp The View this GCN Circular online at https://gcn.nasa.gov/circulars/37076. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34948] GRB240805A: Fermi GBM Observation
by GCN Circulars 06 Aug '24

06 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37075 SUBJECT: GRB240805A: Fermi GBM Observation DATE: 24/08/06 15:04:23 GMT FROM: Jacob Smith at Fermi-GBM Team <jrs0118(a)uah.edu> M. Godwin (UAH), J. Smith (UAH), and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: At 02:02:20.31 UT on 05 August 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240805A (trigger 744516145/240805085),which was also detected by SVOM/GRM (SVOM/GRM team, 2024, GCN 37054), Fermi-LAT (R. Gupta et al. 2024, GCN 37042), INTEGRAL IBAS (S.Mereghetti et al. 2024, GCN 37037), and Swift-BAT (S. Dichiara et al. 2024, GCN 37032). The Final Real-time Localization (Fermi GBM Team 2024, GCN 37031) is consistent with the Fermi-LAT, Integral, and Swift positions. The angle from the Fermi LAT boresight is 59 degrees. The GBM light curve has many short peaks with a duration (T90) of about 10.8 s (50-300 keV). The time-averaged spectrum from T0-3.6 to T0+16.9 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.67 +/- 0.02 and the cutoff energy, parameterized as Epeak, is 330 +/- 8 keV. The event fluence (10-1000 keV) in this time interval is (2.91 +/- 0.04)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+5.8 s in the 10-1000 keV band is 14.3 +/- 0.3 ph/s/cm^2. A Band function fits the spectrum equally well with Epeak= 310 +/- 10 keV, alpha = -0.65 +/- 0.02 and beta = -2.9 +/- 0.3. 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/37075. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34947] GRB 240805B: JinShan optical afterglow detection
by GCN Circulars 06 Aug '24

06 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37074 SUBJECT: GRB 240805B: JinShan optical afterglow detection DATE: 24/08/06 15:03:47 GMT FROM: Dong Xu at NAOC/CAS <dxu(a)nao.cas.cn> Z.P. Zhu, X. Liu, J. An, S.Y. Fu, S.Q. Jiang, L.B. He, D. Xu (NAOC), J.Z. Liu (XAO) report on behalf of a large collaboration: We reported JinShan optical upper limits (GCN 37050) at the Swift/XRT position of GRB 240805B (Williams et al., GCN 37043). Later on, the Enhanced Swift-XRT position was available (Goad et al., GCN 37053), which has a quite positional shift compared to the early position (Williams et al., GCN 37043). Checking the Enhanced Swift-XRT position in the JinShan images, we find the optical afterglow (e.g., Moskvitin et al., GCN 37055; Du et al., GCN 37062) is detected in the r-/i-/z- bands. Thus, the updated preliminary results are as follows: Telescope Tmid-T0/hr Filter Exptime Mag(AB) MagErr 50D 1.683 g 20x180s >21.5 - 100C 0.582 r 5x200s 20.03 0.06 100C 0.868 i 5x200s 18.79 0.02 100C 1.318 z 7x300s 18.79 0.02 We acknowledge the excellent support from S.W. Luo, M.M. Yang, Z.K. Feng, Q.C. Zhao and L.F. Huo for enabling these observations. View this GCN Circular online at https://gcn.nasa.gov/circulars/37074. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 34946] GRB 240804B/EP240804a: Correction to the GRB name in GCN 37071
by GCN Circulars 06 Aug '24

06 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37073 SUBJECT: GRB 240804B/EP240804a: Correction to the GRB name in GCN 37071 DATE: 24/08/06 14:30:48 GMT FROM: Dmitry Frederiks at Ioffe Institute <fred(a)mail.ioffe.ru> Dmitry Frederiks report on behalf of the Konus-Wind team: "The Konus-Wind GRB at 21:36:48 UT on 8 August 2024 (a counterpart of EP240804a) was incorrectly named GRB 240804A (GCN 37071). This burst should be named GRB 240804B. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB240804B/ and the plot the rest-frame hardness-intensity correlations can be found at http://www.ioffe.ru/LEA/GRBs/GRB240804B/GRB240804B_rest_frame.pdf We apologize for any confusion caused." View this GCN Circular online at https://gcn.nasa.gov/circulars/37073. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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