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

[vsnet-grb-info 35215] Fermi GRB 240828A: Global MASTER-Net observations report
by GCN Circulars 28 Aug '24

28 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37321 SUBJECT: Fermi GRB 240828A: Global MASTER-Net observations report DATE: 24/08/28 16:00:49 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, … [View More]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-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 240828A ( Fermi GBM team, GCN 37317) errorbox 140 sec after notice time and 176 sec after trigger time at 2024-08-28 14:58:02 UT, with upper limit up to 15.9 mag. The observations began at zenith distance = 74 deg. The sun altitude is -30.0 deg. The galactic latitude b = 66 deg., longitude l = 60 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2579196 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 196 | 2024-08-28 14:58:02 | MASTER-Amur | (14h 39m 23.80s , +35d 19m 54.3s) | P/ | 40 | 15.1 | 196 | 2024-08-28 14:58:03 | MASTER-Amur | (14h 39m 04.59s , +35d 42m 17.2s) | P\ | 40 | 15.0 | 257 | 2024-08-28 14:59:03 | MASTER-Amur | (14h 39m 23.90s , +35d 19m 55.4s) | P/ | 40 | 15.1 | 257 | 2024-08-28 14:59:03 | MASTER-Amur | (14h 39m 04.69s , +35d 42m 19.9s) | P\ | 40 | 15.3 | 329 | 2024-08-28 15:00:05 | MASTER-Amur | (14h 39m 24.07s , +35d 19m 57.8s) | P/ | 60 | 15.1 | 329 | 2024-08-28 15:00:05 | MASTER-Amur | (14h 39m 04.80s , +35d 42m 23.7s) | P\ | 60 | 15.2 | 417 | 2024-08-28 15:01:28 | MASTER-Amur | (14h 39m 24.26s , +35d 20m 00.2s) | P/ | 70 | 15.4 | 417 | 2024-08-28 15:01:28 | MASTER-Amur | (14h 39m 04.89s , +35d 42m 27.4s) | P\ | 70 | 14.5 | 519 | 2024-08-28 15:03:00 | MASTER-Amur | (14h 39m 04.99s , +35d 42m 33.0s) | P\ | 90 | 14.6 | 519 | 2024-08-28 15:03:00 | MASTER-Amur | (14h 39m 24.53s , +35d 20m 04.7s) | P/ | 90 | 14.5 | 640 | 2024-08-28 15:04:51 | MASTER-Amur | (14h 39m 24.82s , +35d 20m 08.4s) | P/ | 110 | 14.7 | 640 | 2024-08-28 15:04:51 | MASTER-Amur | (14h 39m 05.09s , +35d 42m 38.4s) | P\ | 110 | 14.9 | 787 | 2024-08-28 15:07:03 | MASTER-Amur | (14h 39m 25.20s , +35d 20m 15.8s) | P/ | 140 | 14.9 | 787 | 2024-08-28 15:07:03 | MASTER-Amur | (14h 39m 05.32s , +35d 42m 47.3s) | P\ | 140 | 15.0 | 962 | 2024-08-28 15:09:44 | MASTER-Amur | (14h 39m 25.71s , +35d 20m 24.5s) | P/ | 170 | 15.9 | 962 | 2024-08-28 15:09:44 | MASTER-Amur | (14h 39m 05.65s , +35d 42m 57.7s) | P\ | 170 | 15.7 | 1159 | 2024-08-28 15:12:56 | MASTER-Amur | (14h 39m 26.35s , +35d 20m 34.9s) | P/ | 180 | 15.5 | 1160 | 2024-08-28 15:12:56 | MASTER-Amur | (14h 39m 06.13s , +35d 43m 10.6s) | P\ | 180 | 15.6 | 1360 | 2024-08-28 15:16:16 | MASTER-Amur | (14h 39m 26.92s , +35d 20m 46.7s) | P/ | 180 | 15.5 | 1360 | 2024-08-28 15:16:16 | MASTER-Amur | (14h 39m 06.57s , +35d 43m 23.0s) | P\ | 180 | 15.6 | The observation and reduction will continue. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/37321. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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[vsnet-grb-info 35214] Fermi trigger No 746438824: Global MASTER-Net observations report
by GCN Circulars 28 Aug '24

28 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37320 SUBJECT: Fermi trigger No 746438824: Global MASTER-Net observations report DATE: 24/08/28 16:00:39 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 … [View More]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-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 GRB240827.34 (trigger No 746438824,13h 32m 24.00s , +27d 09m 00.0s, R=29.73) errorbox 14901 sec after notice time and 14932 sec after trigger time at 2024-08-27 12:15:52 UT, with upper limit up to 18.2 mag. Observations started at twilight. The observations began at zenith distance = 53 deg. The sun altitude is -16.4 deg. MASTER-Tavrida robotic telescope located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB240827.34 errorbox 43579 sec after notice time and 43610 sec after trigger time at 2024-08-27 20:13:50 UT, with upper limit up to 18.6 mag. The observations began at zenith distance = 67 deg. The sun altitude is -32.5 deg. The galactic latitude b = 80 deg., longitude l = 34 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2576511 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 14963 | 2024-08-27 12:15:52 | MASTER-Amur | (13h 00m 12.90s , +53d 54m 27.1s) | C | 60 | 17.8 | 14963 | 2024-08-27 12:15:52 | MASTER-Amur | (13h 12m 43.44s , +54d 20m 46.3s) | C | 60 | 18.1 | 15047 | 2024-08-27 12:17:16 | MASTER-Amur | (13h 07m 12.32s , +50d 07m 08.9s) | C | 60 | 18.0 | 15047 | 2024-08-27 12:17:16 | MASTER-Amur | (13h 18m 40.29s , +50d 33m 39.9s) | C | 60 | 17.8 | 15134 | 2024-08-27 12:18:43 | MASTER-Amur | (12h 51m 08.30s , +52d 00m 37.6s) | C | 60 | 17.8 | 15134 | 2024-08-27 12:18:43 | MASTER-Amur | (13h 03m 04.52s , +52d 27m 18.9s) | C | 60 | 18.1 | 15221 | 2024-08-27 12:20:10 | MASTER-Amur | (13h 15m 52.83s , +51d 58m 46.9s) | C | 60 | 17.8 | 15221 | 2024-08-27 12:20:10 | MASTER-Amur | (13h 27m 50.64s , +52d 25m 14.9s) | C | 60 | 18.0 | 15300 | 2024-08-27 12:21:30 | MASTER-Amur | (13h 00m 21.14s , +53d 53m 22.4s) | C | 60 | 17.9 | 15301 | 2024-08-27 12:21:30 | MASTER-Amur | (13h 12m 50.97s , +54d 19m 56.9s) | C | 60 | 18.1 | 15387 | 2024-08-27 12:22:57 | MASTER-Amur | (13h 07m 15.98s , +50d 06m 46.2s) | C | 60 | 18.0 | 15388 | 2024-08-27 12:22:57 | MASTER-Amur | (13h 18m 43.57s , +50d 33m 23.5s) | C | 60 | 18.0 | 15479 | 2024-08-27 12:24:29 | MASTER-Amur | (12h 51m 06.37s , +51d 59m 49.0s) | C | 60 | 18.0 | 15479 | 2024-08-27 12:24:29 | MASTER-Amur | (13h 03m 02.07s , +52d 26m 36.5s) | C | 60 | 18.1 | 15595 | 2024-08-27 12:26:24 | MASTER-Amur | (13h 15m 59.95s , +52d 00m 36.9s) | C | 60 | 18.0 | 15595 | 2024-08-27 12:26:24 | MASTER-Amur | (13h 27m 57.89s , +52d 27m 12.0s) | C | 60 | 18.2 | 15681 | 2024-08-27 12:27:50 | MASTER-Amur | (13h 00m 16.23s , +53d 54m 24.4s) | C | 60 | 18.0 | 15681 | 2024-08-27 12:27:50 | MASTER-Amur | (13h 12m 45.94s , +54d 21m 05.9s) | C | 60 | 18.2 | 16360 | 2024-08-27 12:39:09 | MASTER-Amur | (13h 07m 19.83s , +50d 06m 48.1s) | C | 60 | 18.0 | 16360 | 2024-08-27 12:39:09 | MASTER-Amur | (13h 18m 44.28s , +50d 33m 45.7s) | C | 60 | 18.0 | 16456 | 2024-08-27 12:40:45 | MASTER-Amur | (12h 51m 11.02s , +52d 02m 20.9s) | C | 60 | 17.9 | 16456 | 2024-08-27 12:40:45 | MASTER-Amur | (13h 03m 03.99s , +52d 29m 28.1s) | C | 60 | 18.2 | 16593 | 2024-08-27 12:43:03 | MASTER-Amur | (13h 16m 06.37s , +52d 00m 20.0s) | C | 60 | 18.0 | 16593 | 2024-08-27 12:43:03 | MASTER-Amur | (13h 28m 00.56s , +52d 27m 15.3s) | C | 60 | 18.1 | 43640 | 2024-08-27 20:13:50 | MASTER-Tavrida | (12h 54m 28.59s , +56d 56m 09.6s) | C | 60 | 18.1 | 43640 | 2024-08-27 20:13:50 | MASTER-Tavrida | (12h 54m 32.41s , +56d 51m 36.7s) | C | 60 | 18.4 | 43715 | 2024-08-27 20:15:04 | MASTER-Tavrida | (13h 09m 06.00s , +56d 56m 37.9s) | C | 60 | 18.1 | 43715 | 2024-08-27 20:15:04 | MASTER-Tavrida | (13h 09m 09.86s , +56d 52m 04.1s) | C | 60 | 18.5 | 43866 | 2024-08-27 20:17:35 | MASTER-Tavrida | (12h 58m 27.63s , +58d 13m 07.0s) | C | 60 | 18.0 | 43866 | 2024-08-27 20:17:35 | MASTER-Tavrida | (12h 58m 31.49s , +58d 08m 33.3s) | C | 60 | 18.5 | 43940 | 2024-08-27 20:18:49 | MASTER-Tavrida | (12h 54m 34.37s , +56d 56m 44.1s) | C | 60 | 18.1 | 43940 | 2024-08-27 20:18:49 | MASTER-Tavrida | (12h 54m 38.16s , +56d 52m 10.4s) | C | 60 | 18.4 | 45797 | 2024-08-27 20:49:46 | MASTER-Tavrida | (13h 09m 20.82s , +56d 57m 10.1s) | C | 60 | 17.9 | 45797 | 2024-08-27 20:49:46 | MASTER-Tavrida | (13h 09m 25.15s , +56d 52m 53.9s) | C | 60 | 18.6 | 45947 | 2024-08-27 20:52:17 | MASTER-Tavrida | (12h 58m 38.44s , +58d 15m 23.2s) | C | 60 | 17.7 | 45947 | 2024-08-27 20:52:17 | MASTER-Tavrida | (12h 58m 43.13s , +58d 11m 17.0s) | C | 60 | 18.6 | 46021 | 2024-08-27 20:53:31 | MASTER-Tavrida | (12h 54m 41.53s , +56d 56m 38.7s) | C | 60 | 17.9 | 46021 | 2024-08-27 20:53:31 | MASTER-Tavrida | (12h 54m 46.07s , +56d 52m 31.9s) | C | 60 | 18.5 | 47882 | 2024-08-27 21:24:31 | MASTER-Tavrida | (13h 09m 38.68s , +56d 58m 09.2s) | C | 60 | 17.7 | 47882 | 2024-08-27 21:24:31 | MASTER-Tavrida | (13h 09m 41.53s , +56d 53m 56.4s) | C | 60 | 18.5 | 48032 | 2024-08-27 21:27:01 | MASTER-Tavrida | (12h 58m 45.15s , +58d 16m 22.4s) | C | 60 | 17.5 | 48032 | 2024-08-27 21:27:01 | MASTER-Tavrida | (12h 58m 49.92s , +58d 12m 25.6s) | C | 60 | 18.5 | 98333 | 2024-08-28 11:25:22 | MASTER-Amur | (13h 46m 08.02s , +35d 17m 21.8s) | C | 60 | 15.8 | 98333 | 2024-08-28 11:25:23 | MASTER-Amur | (13h 37m 01.61s , +34d 49m 11.7s) | C | 60 | 15.2 | 98414 | 2024-08-28 11:26:43 | MASTER-Amur | (13h 47m 38.98s , +37d 11m 36.2s) | C | 60 | 16.5 | 98414 | 2024-08-28 11:26:43 | MASTER-Amur | (13h 38m 18.75s , +36d 43m 28.4s) | C | 60 | 16.2 | 98526 | 2024-08-28 11:28:35 | MASTER-Amur | (14h 03m 54.93s , +33d 25m 02.7s) | C | 60 | 17.0 | 98526 | 2024-08-28 11:28:35 | MASTER-Amur | (13h 54m 59.99s , +32d 56m 54.2s) | C | 60 | 16.6 | 98616 | 2024-08-28 11:30:05 | MASTER-Amur | (14h 06m 38.42s , +37d 11m 08.4s) | C | 60 | 17.1 | 98616 | 2024-08-28 11:30:06 | MASTER-Amur | (13h 57m 17.03s , +36d 43m 08.9s) | C | 60 | 16.7 | 98698 | 2024-08-28 11:31:27 | MASTER-Amur | (13h 46m 14.25s , +35d 19m 15.9s) | C | 60 | 16.8 | 98698 | 2024-08-28 11:31:27 | MASTER-Amur | (13h 37m 08.12s , +34d 51m 00.9s) | C | 60 | 16.9 | 98777 | 2024-08-28 11:32:47 | MASTER-Amur | (13h 47m 34.31s , +37d 12m 22.0s) | C | 60 | 16.0 | 98778 | 2024-08-28 11:32:47 | MASTER-Amur | (13h 38m 14.49s , +36d 44m 10.5s) | C | 60 | 15.2 | 98859 | 2024-08-28 11:34:08 | MASTER-Amur | (14h 03m 52.98s , +33d 25m 11.9s) | C | 60 | 16.4 | 98859 | 2024-08-28 11:34:08 | MASTER-Amur | (13h 54m 58.40s , +32d 57m 00.2s) | C | 60 | 15.8 | 98939 | 2024-08-28 11:35:28 | MASTER-Amur | (13h 57m 23.59s , +36d 43m 58.0s) | C | 60 | 14.5 | 111083 | 2024-08-28 14:58:02 | MASTER-Amur | (14h 39m 23.80s , +35d 19m 54.3s) | P/ | 40 | 15.1 | 111083 | 2024-08-28 14:58:03 | MASTER-Amur | (14h 39m 04.59s , +35d 42m 17.2s) | P\ | 40 | 15.0 | 111144 | 2024-08-28 14:59:03 | MASTER-Amur | (14h 39m 23.90s , +35d 19m 55.4s) | P/ | 40 | 15.1 | 111144 | 2024-08-28 14:59:03 | MASTER-Amur | (14h 39m 04.69s , +35d 42m 19.9s) | P\ | 40 | 15.3 | 111216 | 2024-08-28 15:00:05 | MASTER-Amur | (14h 39m 24.07s , +35d 19m 57.8s) | P/ | 60 | 15.1 | 111216 | 2024-08-28 15:00:05 | MASTER-Amur | (14h 39m 04.80s , +35d 42m 23.7s) | P\ | 60 | 15.2 | 111304 | 2024-08-28 15:01:28 | MASTER-Amur | (14h 39m 24.26s , +35d 20m 00.2s) | P/ | 70 | 15.4 | 111304 | 2024-08-28 15:01:28 | MASTER-Amur | (14h 39m 04.89s , +35d 42m 27.4s) | P\ | 70 | 14.5 | 111406 | 2024-08-28 15:03:00 | MASTER-Amur | (14h 39m 04.99s , +35d 42m 33.0s) | P\ | 90 | 14.6 | 111406 | 2024-08-28 15:03:00 | MASTER-Amur | (14h 39m 24.53s , +35d 20m 04.7s) | P/ | 90 | 14.5 | 111527 | 2024-08-28 15:04:51 | MASTER-Amur | (14h 39m 24.82s , +35d 20m 08.4s) | P/ | 110 | 14.7 | 111527 | 2024-08-28 15:04:51 | MASTER-Amur | (14h 39m 05.09s , +35d 42m 38.4s) | P\ | 110 | 14.9 | 111674 | 2024-08-28 15:07:03 | MASTER-Amur | (14h 39m 25.20s , +35d 20m 15.8s) | P/ | 140 | 14.9 | 111674 | 2024-08-28 15:07:03 | MASTER-Amur | (14h 39m 05.32s , +35d 42m 47.3s) | P\ | 140 | 15.0 | 111849 | 2024-08-28 15:09:44 | MASTER-Amur | (14h 39m 25.71s , +35d 20m 24.5s) | P/ | 170 | 15.9 | 111849 | 2024-08-28 15:09:44 | MASTER-Amur | (14h 39m 05.65s , +35d 42m 57.7s) | P\ | 170 | 15.7 | 112047 | 2024-08-28 15:12:56 | MASTER-Amur | (14h 39m 26.35s , +35d 20m 34.9s) | P/ | 180 | 15.5 | 112047 | 2024-08-28 15:12:56 | MASTER-Amur | (14h 39m 06.13s , +35d 43m 10.6s) | P\ | 180 | 15.6 | 112247 | 2024-08-28 15:16:16 | MASTER-Amur | (14h 39m 26.92s , +35d 20m 46.7s) | P/ | 180 | 15.5 | 112247 | 2024-08-28 15:16:16 | MASTER-Amur | (14h 39m 06.57s , +35d 43m 23.0s) | P\ | 180 | 15.6 | 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/37320. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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[vsnet-grb-info 35213] SVOM GRB 240821A: optical afterglow discovery
by GCN Circulars 28 Aug '24

28 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37319 SUBJECT: SVOM GRB 240821A: optical afterglow discovery DATE: 24/08/28 15:57:55 GMT FROM: Daniele B. Malesani at IMAPP / Radboud University <d.malesani(a)astro.ru.nl> J. Quirola-Vasquez (Radboud Univ.), D. B. Malesani (DAWN/NBI and Radboud Univ.), A. J. Levan (Radboud Univ. & Warwick Univ.), P. G. Jonker (Radboud Univ), F. E. Bauer (PUC), J. van Dalen (Radboud Univ.), M. E. Ravasio (Radboud Univ.), D. Mata Sanchez (IAC), M. A. P. Torres (IAC),… [View More]

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[vsnet-grb-info 35212] GRB 240828B : Detection of a possible very soft X-ray transient by SVOM/ECLAIRs
by GCN Circulars 28 Aug '24

28 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37318 SUBJECT: GRB 240828B : Detection of a possible very soft X-ray transient by SVOM/ECLAIRs DATE: 24/08/28 15:26:06 GMT FROM: s.schanne(a)cea.fr SVOM/ECLAIRs commissioning team: Hervé Le Provost, Stéphane Schanne, Frédéric Chateau, Nicolas Dagoneau (CEA), Olivier Godet, Laurent Bouchet, Sebastien Guillot, Juliette Alaux (IRAP), Frédéric Piron (LUPM), Karine Mercier, Marie-Claire Charmeau, Stefano Crepaldi (CNES), Alexis Coleiro (APC) SVOM JSWG: Jian-… [View More]

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[vsnet-grb-info 35211] GRB 240828A: Fermi GBM Final Real-time Localization
by GCN Circulars 28 Aug '24

28 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37317 SUBJECT: GRB 240828A: Fermi GBM Final Real-time Localization DATE: 24/08/28 15:05:42 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply(a)GIOC.nsstc.nasa.gov> The Fermi GBM team reports the detection of a likely LONG GRB At 14:55:06 UT on 28 Aug 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240828A (trigger 746549711.829992 / 240828622). The on-ground calculated location, using the Fermi GBM trigger data, is RA =… [View More]

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[vsnet-grb-info 35210] GRB 240821A: the second and third EP-FXT follow-up observations and afterglow candidates
by GCN Circulars 28 Aug '24

28 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37316 SUBJECT: GRB 240821A: the second and third EP-FXT follow-up observations and afterglow candidates DATE: 24/08/28 10:49:36 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> D. Turpin (CEA), H. Q. Cheng, H. Sun, W. Xie (NAOC, CAS), Y. F. Liang (PMO, CAS), J. Q. Peng (IHEP, CAS), W. Yuan (NAOC, CAS), S. Guillot (IRAP), J. Guan, C. K. Li, Y. Chen, S. M. Jia, W. W. Cui, D. W. Han, W. Li, C. Z. Liu, F. J. Lu, L. M. Song, J. Wang, J. J. Xu, J. Zhang, S. N. … [View More]Zhang, H. S. Zhao, X. F. Zhao (IHEP, CAS), Y. Liu, C. C. Jin, C. Zhang, Z. X. Ling, J. Wang, L. P. Xin (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 SVOM and Einstein Probe teams We performed two additional epochs of follow-up observation of GRB 240821A (Cangemi et al, GCN 37220; He et al. GCN 37226; Fermi/GBM GCN 37219) with the Follow-up X-ray Telescope (FXT) on board the Einstein Probe (EP) mission. The observation started at epoch 2: 2024-08-22T09:46:59 and epoch3 2024-08-26T10:00:08 (T-TGRB ~ 0.63 and 4.64d, respectively ) each for about 8 ks of exposure in total. In addition, we reprocessed the data of the first epoch (Turpin et al., GCN 37230) with 5 ks of total exposure. In total, considering the 3 epochs of observation, we detected 25 uncatalogued individual X-ray sources within a radius of 13 arcmin centered at RA, DEC = 354.23 deg, -10.18 deg (Cangemi et al, GCN 37220). - 9 sources have only one detection in either epoch 2 or 3 and are not consistent with the Swift/XRT source positions. We do not consider these sources as credible afterglow candidates. - 14 sources are detected in at least two epochs but are consistent, within errors, with no flux variability as function of time. 3 of them are consistent in position and flux measurement with the Swift/XRT source #1, #2 and #4 (Evans et al., GCN 37249). We do not consider these sources as credible afterglow candidates. - 2 sources are detected in the epochs 1 and 2, but were not detected in the third epoch (even if an excess is marginally detected for one of them), showing a clear sign of fading behavior across the three epochs. Therefore, they are considered as credible afterglow candidates. The following table lists the detailed information of these two X-ray candidates detected by EP-FXT. The positions are given with an uncertainty of 10 arcsec (radius, 90% C.L. statistical and systematic). The fluxes are given based on the observations of FXT-B. The measured fluxes of the epoch 1 and epoch 2 are calculated in the 0.5 - 10 keV energy range and the uncertainties are at the 90% confidence level. The upper limits of the epoch 3 are calculated using the best-fitting parameter obtained by fitting the X-ray spectra of epoch 2 and given in the 0.5 - 10 keV at the 90% confidence level. EP-FXT source #1 RA, DEC (J2000) = 354.2701 deg, -10.1911 deg ----------------------------------------------------------- | epoch # | TGRB-Tstart | exposure | Estimated Flux | | | hr | ks | (erg/s/cm^2) | ----------------------------------------------------------- | 1 | 8.8 | 5.0 | 1.1(+/-0.2) x 10^-13 | | 2 | 15.2 | 8.0 | 5.9(+/-1.3) x 10^-14 | | 3 | 111.4 | 8.4 | < 1.5 x 10^-14 | ----------------------------------------------------------- EP-FXT source #2 RA, DEC(J2000) = 354.1516 deg, -10.0504 deg ----------------------------------------------------------- | epoch # | TGRB-Tstart | exposure | Estimated Flux | | | hr | ks | (erg/s/cm^2) | ----------------------------------------------------------- | 1 | 8.8 | 5.0 | 6.0(+/-1.3) x 10^-14 | | 2 | 15.2 | 8.0 | 3.5(+/-1.0) x 10^-14 | | 3 | 111.4 | 8.4 | < 3.4 x 10^-14 | ----------------------------------------------------------- The EP-FXT source #1 is spatially consistent with the Swift/XRT #3 source (Evans et al., GCN 37249). It is the brightest X-ray counterpart found in the first epoch and the decreasing of the flux is compatible with the reported XRT flux within errors. The EP-FXT source #2 is actually marginally detected in the third epoch thus the upper limit presented in the above table is not significantly lower than the flux measured in the second epoch. We suggest that the EP-FXT source #1 is the most promising X-ray afterglow candidate of GRB 240821A. We strongly encourage further optical and NIR follow-up of this sky position RA, DEC (J2000) = 354.2701 deg, -10.1911 deg (10” error radius) with large telescopes to potentially detect late time kilonova/supernova emission associated with this short GRB+extended emission. The above observation was made with the EP-FXT instrument. 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. View this GCN Circular online at https://gcn.nasa.gov/circulars/37316. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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[vsnet-grb-info 35209] GRB 240825A: GECAM detection
by GCN Circulars 28 Aug '24

28 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37315 SUBJECT: GRB 240825A: GECAM detection DATE: 24/08/28 09:07:31 GMT FROM: Chenwei Wang at IHEP <cwwang(a)ihep.ac.cn> Chen-Wei Wang (IHEP), Shao-Lin Xiong (IHEP) report on behalf of the GECAM team: GECAM-B was triggered in-flight by a long burst, GRB 240825A at 2024-08-25T15:53:00 UTC (denoted as T0), which was also detected by many missions, including Swift (R. Gupta et al., GCN 37274), Fermi/LAT (N. Di Lalla et al., GCN 37288), AstroSat (J. … [View More]

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[vsnet-grb-info 35208] GRB 240825A: ALMA detection
by GCN Circulars 28 Aug '24

28 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37314 SUBJECT: GRB 240825A: ALMA detection DATE: 24/08/28 01:28:11 GMT FROM: Tanmoy Laskar at U of Utah <tanmoylaskar(a)gmail.com> T. Laskar (University of Utah), K. D. Alexander (University of Arizona), C. Christy (University of Arizona), C. Peña (University of Utah), G. Schroeder (Northwestern University), E. Berger (Harvard University), R. Chornock (UC Berkeley), W. Fong (Northwestern University), R. Margutti (UC Berkeley), and P. Schady (… [View More]

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[vsnet-grb-info 35207] GRB 240825A: SAO RAS optical observations
by GCN Circulars 28 Aug '24

28 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37313 SUBJECT: GRB 240825A: SAO RAS optical observations DATE: 24/08/28 00:51:15 GMT FROM: Moskvitin Alexander at SAO RAS <mosk(a)sao.ru> A. S. Moskvitin and O. I. Spiridonova (SAO RAS) report on behalf of the GRB follow-up team. We observed the field of the GRB 240825A (The Fermi GBM team, GCN 37273; Gupta et al., GCN 37274; Lalla et al., GCN 37288; Evans et al., 37290; Gropp et al., GCN 37294; Joshi et al., GCN 37298; Sharma et al., GCN 37301; … [View More]

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[vsnet-grb-info 35206] GRB 240824A: GIT optical upper limit
by GCN Circulars 27 Aug '24

27 Aug '24

TITLE: GCN CIRCULAR NUMBER: 37312 SUBJECT: GRB 240824A: GIT optical upper limit DATE: 24/08/27 16:58:54 GMT FROM: vishwajeet.s(a)iitb.ac.in T. Mohan, R. Kumar, V. Swain, V. Bhalerao (IITB), G.C. Anupama, S. Barway (IIA) and K. Angail (IAO) report on behalf of the GIT team: We observed the field of the Swift GRB 240824A (Cenko et al., GCN 37254) with the 0.7m GROWTH-India Telescope (GIT). The observations started at 2024-08-24 16:57:29 UT, about 16 hours after the Swift BAT trigger. … [View More]

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