GRB 260417A
GCN Circular 44349
Subject
GRB 260417A: SVOM/GRM observation
Date
2026-04-19T16:33:14Z (12 days ago)
From
zhangjinpeng@ihep.ac.cn
Via
Web form
SVOM/GRM team: Jin-Peng Zhang, Chen-Wei Wang, Shi-Jie Zheng, Yue Huang, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP)
SVOM/ECLAIRs team: Sebastien Guillot (IRAP)
Report on behalf of the SVOM team:
SVOM/GRM detected GRB 260417A at 2026-04-17T00:10:11.500 (T0), which is also detected by Fermi/GBM (Fermi GBM Team, GCN #44317), AstroSat CZTI (S. Salunke et al., GCN #44330) and possibly by EP (K. R. Ni et al., GCN #44337).
With the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst mainly consists of a pulse with a T90 of 38 +15/-10 s in the 15-5000 keV band.
The SVOM/GRM light curve can be found here:
https://www.bursthub.cn//admin/static/svgrb260417A.png
In addition, the position of this burst, according to Fermi/GBM localization (RA = 252.0, Dec = -19.8, error(stat) = 3.4, Fermi GBM Team, GCN #44317), is located at about 90.3 degrees from the SVOM optical axis, which is outside the ECLAIRs field of view.
With this localization, the time-averaged spectrum from T0-20 to T0+20 s is fitted by a power law function. The power law index is -1.77 +0.09/-0.09. The event fluence (10-1000 keV) in this time interval is (9.1 +1.0/-1.1)E-06 erg/cm^2.
The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. GRM is developed by the Institute of High Energy Physics (IHEP) of CAS.
The SVOM/GRM point of contact for this burst is: Jin-Peng Zhang (IHEP) (zhangjinpeng@ihep.ac.cn)
GCN Circular 44333
Subject
Fermi GRB 260417A: Global MASTER-Net observations report
Date
2026-04-17T21:30:34Z (14 days ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
email
V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko,
G.Antipov, A.Sankovich, Yu.Tselik, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU),
O.Gress, N.Budnev (ISU),
C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A.Sosnovskij (CrAO),
A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity),
D.Buckley (SAAO),
R.Rebolo (The Instituto de Astrofisica de Canarias),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)
MASTER-OAFA robotic telescope [1] located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 260417A ( Fermi GBM team, GCN 44317) errorbox 14312 sec after notice time and 14368 sec after trigger time at 2026-04-17 04:09:33 UT, with upper limit up to 19.8 mag. The observations began at zenith distance = 45 deg. The sun altitude is -68.6 deg.
MASTER-OAGH robotic telescope located in Mexico (OAGH National Institute for Astrophysics, Optics and Electronics) started inspect of the Fermi GRB 260417A errorbox 29871 sec after notice time and 29926 sec after trigger time at 2026-04-17 08:28:52 UT, with upper limit up to 19.2 mag. The observations began at zenith distance = 57 deg. The sun altitude is -45.3 deg.
The galactic latitude b = 15 deg., longitude l = 0 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=3255373
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
740 | 2026-04-17 00:21:24 | MASTER- | (16h 47m 57.82s , -19d 41m 25.5s) | C | 120 | 18.4 |
870 | 2026-04-17 00:23:35 | MASTER- | (16h 47m 57.86s , -19d 41m 30.5s) | C | 120 | 17.7 |
982 | 2026-04-17 00:25:57 | MASTER- | (16h 41m 27.04s , -19d 45m 05.5s) | C | 60 | 16.7 |
1061 | 2026-04-17 00:27:16 | MASTER- | (16h 38m 52.56s , -21d 03m 50.4s) | C | 60 | 17.4 |
1135 | 2026-04-17 00:28:30 | MASTER- | (16h 52m 35.98s , -19d 46m 01.7s) | C | 60 | 18.1 |
1886 | 2026-04-17 00:41:00 | MASTER- | (16h 48m 15.35s , -17d 09m 21.3s) | C | 60 | 16.8 |
1966 | 2026-04-17 00:42:21 | MASTER- | (16h 37m 18.54s , -17d 09m 12.5s) | C | 60 | 17.6 |
2807 | 2026-04-17 00:56:22 | MASTER- | (16h 41m 21.64s , -15d 53m 39.3s) | C | 60 | 17.0 |
2892 | 2026-04-17 00:57:46 | MASTER- | (16h 46m 18.69s , -23d 39m 40.4s) | C | 60 | 17.6 |
2970 | 2026-04-17 00:59:05 | MASTER- | (16h 52m 17.13s , -15d 52m 05.1s) | C | 60 | 18.4 |
4185 | 2026-04-17 01:19:20 | MASTER- | (16h 59m 10.68s , -17d 13m 44.6s) | C | 60 | 16.9 |
5170 | 2026-04-17 01:35:44 | MASTER- | (16h 46m 07.39s , -14d 39m 25.0s) | C | 60 | 17.8 |
5246 | 2026-04-17 01:37:01 | MASTER- | (16h 45m 26.27s , -25d 02m 33.4s) | C | 60 | 18.4 |
5924 | 2026-04-17 01:48:19 | MASTER- | (17h 06m 41.90s , -18d 34m 04.5s) | C | 60 | 18.1 |
14398 | 2026-04-17 04:09:33 | MASTER-OAFA | (16h 29m 03.49s , -19d 43m 08.6s) | C | 60 | 19.5 |
14458 | 2026-04-17 04:09:33 | MASTER-OAFA | (16h 29m 03.49s , -19d 43m 08.6s) | C | 180 | 19.8 | Coadd
14552 | 2026-04-17 04:12:06 | MASTER-OAFA | (16h 28m 56.24s , -19d 43m 02.7s) | C | 60 | 19.5 |
14779 | 2026-04-17 04:15:54 | MASTER-OAFA | (16h 38m 39.66s , -23d 31m 48.1s) | C | 60 | 19.5 |
14839 | 2026-04-17 04:15:54 | MASTER-OAFA | (16h 38m 39.65s , -23d 31m 48.1s) | C | 180 | 19.8 | Coadd
14933 | 2026-04-17 04:18:28 | MASTER-OAFA | (16h 38m 41.76s , -23d 32m 12.6s) | C | 60 | 19.5 |
15084 | 2026-04-17 04:20:58 | MASTER-OAFA | (16h 32m 49.20s , -21d 38m 08.4s) | C | 60 | 19.3 |
15144 | 2026-04-17 04:20:58 | MASTER-OAFA | (16h 32m 49.20s , -21d 38m 08.4s) | C | 180 | 19.8 | Coadd
15160 | 2026-04-17 04:22:14 | MASTER-OAFA | (16h 41m 19.99s , -21d 39m 40.4s) | C | 60 | 19.2 |
15220 | 2026-04-17 04:22:14 | MASTER-OAFA | (16h 41m 19.99s , -21d 39m 40.4s) | C | 180 | 19.6 | Coadd
15235 | 2026-04-17 04:23:29 | MASTER-OAFA | (16h 32m 50.94s , -21d 39m 03.8s) | C | 60 | 19.4 |
15310 | 2026-04-17 04:24:45 | MASTER-OAFA | (16h 41m 23.57s , -21d 37m 54.0s) | C | 60 | 19.3 |
15386 | 2026-04-17 04:26:00 | MASTER-OAFA | (16h 32m 46.94s , -21d 38m 37.5s) | C | 60 | 19.5 |
16850 | 2026-04-17 04:50:25 | MASTER-OAFA | (16h 28m 56.55s , -19d 42m 02.5s) | C | 60 | 19.3 |
16925 | 2026-04-17 04:51:40 | MASTER-OAFA | (16h 29m 02.98s , -19d 43m 01.7s) | C | 60 | 18.9 |
16985 | 2026-04-17 04:51:40 | MASTER-OAFA | (16h 29m 02.97s , -19d 43m 01.8s) | C | 180 | 18.1 | Coadd
16998 | 2026-04-17 04:52:53 | MASTER-OAFA | (16h 28m 57.16s , -19d 43m 59.2s) | C | 60 | 16.6 |
17301 | 2026-04-17 04:57:55 | MASTER-OAFA | (16h 38m 42.29s , -23d 30m 44.7s) | C | 60 | 19.3 |
17375 | 2026-04-17 04:59:10 | MASTER-OAFA | (16h 38m 36.15s , -23d 31m 34.8s) | C | 60 | 19.3 |
17435 | 2026-04-17 04:59:10 | MASTER-OAFA | (16h 38m 36.15s , -23d 31m 34.8s) | C | 180 | 19.7 | Coadd
17453 | 2026-04-17 05:00:27 | MASTER-OAFA | (16h 38m 35.44s , -23d 30m 32.8s) | C | 60 | 19.3 |
17754 | 2026-04-17 05:05:29 | MASTER-OAFA | (16h 41m 22.90s , -21d 36m 58.6s) | C | 60 | 19.2 |
17831 | 2026-04-17 05:06:46 | MASTER-OAFA | (16h 41m 22.86s , -21d 37m 58.9s) | C | 60 | 19.3 |
17891 | 2026-04-17 05:06:46 | MASTER-OAFA | (16h 41m 22.86s , -21d 37m 58.9s) | C | 180 | 19.2 | Coadd
17908 | 2026-04-17 05:08:03 | MASTER-OAFA | (16h 41m 25.06s , -21d 36m 28.2s) | C | 60 | 18.8 |
17984 | 2026-04-17 05:09:18 | MASTER-OAFA | (16h 32m 42.35s , -21d 36m 55.9s) | C | 60 | 18.8 |
18044 | 2026-04-17 05:09:18 | MASTER-OAFA | (16h 32m 42.34s , -21d 36m 55.9s) | C | 180 | 19.4 | Coadd
18060 | 2026-04-17 05:10:35 | MASTER-OAFA | (16h 32m 43.80s , -21d 35m 53.7s) | C | 60 | 18.6 |
18136 | 2026-04-17 05:11:50 | MASTER-OAFA | (16h 32m 49.52s , -21d 36m 53.1s) | C | 60 | 19.2 |
19599 | 2026-04-17 05:36:13 | MASTER-OAFA | (16h 28m 58.57s , -19d 41m 32.5s) | C | 60 | 14.5 |
19676 | 2026-04-17 05:37:31 | MASTER-OAFA | (16h 28m 58.56s , -19d 43m 06.6s) | C | 60 | 19.1 |
19736 | 2026-04-17 05:37:31 | MASTER-OAFA | (16h 28m 58.56s , -19d 43m 06.6s) | C | 180 | 19.5 | Coadd
19751 | 2026-04-17 05:38:46 | MASTER-OAFA | (16h 29m 01.46s , -19d 41m 18.4s) | C | 60 | 18.9 |
20056 | 2026-04-17 05:43:51 | MASTER-OAFA | (16h 38m 36.75s , -23d 31m 41.7s) | C | 60 | 18.9 |
20131 | 2026-04-17 05:45:06 | MASTER-OAFA | (16h 38m 41.80s , -23d 31m 32.2s) | C | 60 | 19.0 |
20191 | 2026-04-17 05:45:06 | MASTER-OAFA | (16h 38m 41.80s , -23d 31m 32.2s) | C | 180 | 19.3 | Coadd
20206 | 2026-04-17 05:46:21 | MASTER-OAFA | (16h 38m 38.94s , -23d 29m 52.9s) | C | 60 | 19.3 |
20509 | 2026-04-17 05:51:24 | MASTER-OAFA | (16h 41m 20.29s , -21d 35m 43.1s) | C | 60 | 14.1 |
20584 | 2026-04-17 05:52:39 | MASTER-OAFA | (16h 41m 24.57s , -21d 36m 41.8s) | C | 60 | 15.4 |
20659 | 2026-04-17 05:53:54 | MASTER-OAFA | (16h 41m 19.16s , -21d 37m 41.1s) | C | 60 | 18.4 |
20734 | 2026-04-17 05:55:09 | MASTER-OAFA | (16h 32m 48.78s , -21d 37m 05.4s) | C | 60 | 19.2 |
20794 | 2026-04-17 05:55:09 | MASTER-OAFA | (16h 32m 48.80s , -21d 37m 05.3s) | C | 180 | 18.4 | Coadd
20812 | 2026-04-17 05:56:27 | MASTER-OAFA | (16h 32m 45.89s , -21d 35m 38.2s) | C | 60 | 18.1 |
20888 | 2026-04-17 05:57:43 | MASTER-OAFA | (16h 32m 45.82s , -21d 37m 12.7s) | C | 60 | 16.2 |
22370 | 2026-04-17 06:22:25 | MASTER-OAFA | (16h 28m 53.83s , -19d 42m 20.8s) | C | 60 | 19.1 |
22445 | 2026-04-17 06:23:39 | MASTER-OAFA | (16h 28m 54.52s , -19d 41m 20.3s) | C | 60 | 18.6 |
22526 | 2026-04-17 06:25:01 | MASTER-OAFA | (16h 28m 59.87s , -19d 42m 20.3s) | C | 60 | 18.4 |
22604 | 2026-04-17 06:26:18 | MASTER-OAFA | (16h 38m 35.62s , -23d 31m 33.0s) | C | 60 | 17.6 |
22682 | 2026-04-17 06:27:36 | MASTER-OAFA | (16h 38m 43.18s , -23d 31m 05.7s) | C | 60 | 15.2 |
29957 | 2026-04-17 08:28:52 | MASTER-OAGH | (16h 36m 33.19s , -19d 47m 23.6s) | C | 60 | 18.9 |
29957 | 2026-04-17 08:28:52 | MASTER-OAGH | (16h 37m 50.69s , -20d 20m 45.0s) | C | 60 | 18.7 |
30029 | 2026-04-17 08:30:04 | MASTER-OAGH | (16h 44m 56.42s , -19d 48m 38.0s) | C | 60 | 18.8 |
30029 | 2026-04-17 08:30:04 | MASTER-OAGH | (16h 46m 13.73s , -20d 22m 00.2s) | C | 60 | 18.5 |
30167 | 2026-04-17 08:32:21 | MASTER-OAGH | (16h 52m 42.81s , -19d 47m 51.8s) | C | 60 | 18.7 |
30167 | 2026-04-17 08:32:21 | MASTER-OAGH | (16h 53m 59.94s , -20d 21m 15.2s) | C | 60 | 18.5 |
30238 | 2026-04-17 08:33:33 | MASTER-OAGH | (17h 01m 06.21s , -19d 49m 06.7s) | C | 60 | 18.6 |
30238 | 2026-04-17 08:33:33 | MASTER-OAGH | (17h 02m 23.12s , -20d 22m 30.8s) | C | 60 | 18.4 |
30368 | 2026-04-17 08:35:42 | MASTER-OAGH | (16h 41m 21.49s , -17d 53m 37.9s) | C | 60 | 19.2 |
30368 | 2026-04-17 08:35:42 | MASTER-OAGH | (16h 42m 38.31s , -18d 26m 58.0s) | C | 60 | 18.9 |
30439 | 2026-04-17 08:36:54 | MASTER-OAGH | (16h 49m 40.61s , -17d 54m 51.2s) | C | 60 | 19.0 |
30439 | 2026-04-17 08:36:54 | MASTER-OAGH | (16h 50m 57.29s , -18d 28m 12.0s) | C | 60 | 18.7 |
30579 | 2026-04-17 08:39:13 | MASTER-OAGH | (16h 36m 25.99s , -19d 46m 31.3s) | C | 60 | 19.0 |
30579 | 2026-04-17 08:39:13 | MASTER-OAGH | (16h 37m 43.64s , -20d 19m 50.6s) | C | 60 | 18.7 |
30651 | 2026-04-17 08:40:26 | MASTER-OAGH | (16h 45m 03.36s , -19d 47m 45.4s) | C | 60 | 18.9 |
30651 | 2026-04-17 08:40:26 | MASTER-OAGH | (16h 46m 20.86s , -20d 21m 05.7s) | C | 60 | 18.6 |
30789 | 2026-04-17 08:42:43 | MASTER-OAGH | (16h 52m 35.27s , -19d 46m 58.1s) | C | 60 | 18.6 |
30789 | 2026-04-17 08:42:43 | MASTER-OAGH | (16h 53m 52.67s , -20d 20m 19.7s) | C | 60 | 18.3 |
30860 | 2026-04-17 08:43:55 | MASTER-OAGH | (17h 01m 11.22s , -19d 48m 13.0s) | C | 60 | 18.6 |
30860 | 2026-04-17 08:43:55 | MASTER-OAGH | (17h 02m 28.42s , -20d 21m 35.4s) | C | 60 | 18.5 |
31050 | 2026-04-17 08:47:05 | MASTER-OAGH | (16h 41m 16.84s , -17d 52m 41.9s) | C | 60 | 19.1 |
31050 | 2026-04-17 08:47:05 | MASTER-OAGH | (16h 42m 34.04s , -18d 26m 00.5s) | C | 60 | 18.9 |
31122 | 2026-04-17 08:48:17 | MASTER-OAGH | (16h 49m 47.00s , -17d 53m 56.4s) | C | 60 | 19.1 |
31122 | 2026-04-17 08:48:17 | MASTER-OAGH | (16h 51m 04.07s , -18d 27m 15.7s) | C | 60 | 18.6 |
31260 | 2026-04-17 08:50:34 | MASTER-OAGH | (16h 36m 26.98s , -19d 46m 35.0s) | C | 60 | 19.0 |
31260 | 2026-04-17 08:50:34 | MASTER-OAGH | (16h 37m 44.96s , -20d 19m 52.8s) | C | 60 | 18.7 |
31331 | 2026-04-17 08:51:45 | MASTER-OAGH | (16h 45m 02.69s , -19d 47m 50.4s) | C | 60 | 18.8 |
31331 | 2026-04-17 08:51:46 | MASTER-OAGH | (16h 46m 20.56s , -20d 21m 09.2s) | C | 60 | 18.7 |
31468 | 2026-04-17 08:54:03 | MASTER-OAGH | (16h 52m 35.52s , -19d 47m 03.7s) | C | 60 | 18.9 |
31468 | 2026-04-17 08:54:03 | MASTER-OAGH | (16h 53m 53.26s , -20d 20m 23.4s) | C | 60 | 18.6 |
31539 | 2026-04-17 08:55:14 | MASTER-OAGH | (17h 01m 10.49s , -19d 48m 19.4s) | C | 60 | 18.5 |
31539 | 2026-04-17 08:55:14 | MASTER-OAGH | (17h 02m 28.05s , -20d 21m 39.9s) | C | 60 | 18.3 |
31730 | 2026-04-17 08:58:25 | MASTER-OAGH | (16h 41m 15.86s , -17d 52m 46.1s) | C | 60 | 19.1 |
31730 | 2026-04-17 08:58:25 | MASTER-OAGH | (16h 42m 33.35s , -18d 26m 03.0s) | C | 60 | 18.8 |
31802 | 2026-04-17 08:59:37 | MASTER-OAGH | (16h 49m 46.34s , -17d 54m 01.2s) | C | 60 | 19.1 |
31802 | 2026-04-17 08:59:37 | MASTER-OAGH | (16h 51m 03.72s , -18d 27m 18.9s) | C | 60 | 18.7 |
31941 | 2026-04-17 09:01:56 | MASTER-OAGH | (16h 36m 25.67s , -19d 46m 37.8s) | C | 60 | 19.1 |
31942 | 2026-04-17 09:01:56 | MASTER-OAGH | (16h 37m 44.02s , -20d 19m 54.4s) | C | 60 | 18.7 |
32013 | 2026-04-17 09:03:08 | MASTER-OAGH | (16h 45m 01.71s , -19d 47m 54.4s) | C | 60 | 18.9 |
32013 | 2026-04-17 09:03:08 | MASTER-OAGH | (16h 46m 19.93s , -20d 21m 11.7s) | C | 60 | 18.6 |
32203 | 2026-04-17 09:06:18 | MASTER-OAGH | (16h 52m 34.62s , -19d 47m 08.4s) | C | 60 | 18.8 |
32203 | 2026-04-17 09:06:18 | MASTER-OAGH | (16h 53m 52.79s , -20d 20m 26.6s) | C | 60 | 18.5 |
32275 | 2026-04-17 09:07:29 | MASTER-OAGH | (17h 01m 10.22s , -19d 48m 25.0s) | C | 60 | 18.6 |
32275 | 2026-04-17 09:07:30 | MASTER-OAGH | (17h 02m 28.23s , -20d 21m 43.8s) | C | 60 | 18.5 |
32413 | 2026-04-17 09:09:48 | MASTER-OAGH | (16h 41m 15.97s , -17d 52m 49.5s) | C | 60 | 19.1 |
32413 | 2026-04-17 09:09:48 | MASTER-OAGH | (16h 42m 33.77s , -18d 26m 05.1s) | C | 60 | 18.9 |
32485 | 2026-04-17 09:11:00 | MASTER-OAGH | (16h 49m 46.18s , -17d 54m 05.0s) | C | 60 | 18.8 |
32485 | 2026-04-17 09:11:00 | MASTER-OAGH | (16h 51m 03.92s , -18d 27m 21.4s) | C | 60 | 18.5 |
32556 | 2026-04-17 09:12:11 | MASTER-OAGH | (16h 36m 25.00s , -19d 48m 39.6s) | C | 60 | 18.7 |
32556 | 2026-04-17 09:12:11 | MASTER-OAGH | (16h 37m 43.65s , -20d 21m 55.1s) | C | 60 | 18.6 |
32628 | 2026-04-17 09:13:23 | MASTER-OAGH | (16h 45m 01.47s , -19d 48m 46.4s) | C | 60 | 18.6 |
32628 | 2026-04-17 09:13:23 | MASTER-OAGH | (16h 46m 20.00s , -20d 22m 02.6s) | C | 60 | 18.4 |
32700 | 2026-04-17 09:14:35 | MASTER-OAGH | (16h 48m 58.70s , -21d 42m 47.7s) | C | 60 | 18.8 |
32700 | 2026-04-17 09:14:35 | MASTER-OAGH | (16h 50m 17.92s , -22d 16m 05.3s) | C | 60 | 18.4 |
32771 | 2026-04-17 09:15:46 | MASTER-OAGH | (16h 57m 38.81s , -21d 41m 35.9s) | C | 60 | 18.5 |
32771 | 2026-04-17 09:15:46 | MASTER-OAGH | (16h 58m 57.88s , -22d 14m 54.5s) | C | 60 | 18.4 |
32844 | 2026-04-17 09:16:58 | MASTER-OAGH | (16h 52m 34.06s , -19d 48m 12.2s) | C | 60 | 18.9 |
32844 | 2026-04-17 09:16:58 | MASTER-OAGH | (16h 53m 52.48s , -20d 21m 29.1s) | C | 60 | 18.5 |
32915 | 2026-04-17 09:18:10 | MASTER-OAGH | (17h 01m 04.38s , -19d 47m 28.3s) | C | 60 | 18.6 |
32915 | 2026-04-17 09:18:10 | MASTER-OAGH | (17h 02m 22.65s , -20d 20m 46.1s) | C | 60 | 18.5 |
32987 | 2026-04-17 09:19:22 | MASTER-OAGH | (16h 32m 33.11s , -21d 42m 33.0s) | C | 60 | 18.7 |
32987 | 2026-04-17 09:19:22 | MASTER-OAGH | (16h 33m 52.63s , -22d 15m 48.3s) | C | 60 | 18.5 |
33060 | 2026-04-17 09:20:35 | MASTER-OAGH | (16h 41m 17.47s , -21d 42m 27.3s) | C | 60 | 18.9 |
33060 | 2026-04-17 09:20:35 | MASTER-OAGH | (16h 42m 36.89s , -22d 15m 43.2s) | C | 60 | 18.7 |
33131 | 2026-04-17 09:21:46 | MASTER-OAGH | (16h 41m 17.42s , -17d 53m 13.2s) | C | 60 | 18.9 |
33132 | 2026-04-17 09:21:46 | MASTER-OAGH | (16h 42m 35.50s , -18d 26m 27.3s) | C | 60 | 18.9 |
33203 | 2026-04-17 09:22:58 | MASTER-OAGH | (16h 49m 41.56s , -17d 54m 40.7s) | C | 60 | 19.0 |
33203 | 2026-04-17 09:22:58 | MASTER-OAGH | (16h 50m 59.53s , -18d 27m 55.6s) | C | 60 | 18.6 |
33275 | 2026-04-17 09:24:10 | MASTER-OAGH | (16h 36m 29.72s , -19d 46m 57.4s) | C | 60 | 18.9 |
33275 | 2026-04-17 09:24:10 | MASTER-OAGH | (16h 37m 48.54s , -20d 20m 11.6s) | C | 60 | 18.6 |
33411 | 2026-04-17 09:26:25 | MASTER-OAGH | (16h 44m 54.82s , -19d 46m 58.7s) | C | 60 | 18.8 |
33411 | 2026-04-17 09:26:25 | MASTER-OAGH | (16h 46m 13.61s , -20d 20m 13.5s) | C | 60 | 18.5 |
33482 | 2026-04-17 09:27:37 | MASTER-OAGH | (16h 49m 01.73s , -21d 42m 06.9s) | C | 60 | 18.6 |
33482 | 2026-04-17 09:27:37 | MASTER-OAGH | (16h 50m 21.20s , -22d 15m 23.1s) | C | 60 | 18.5 |
33623 | 2026-04-17 09:29:57 | MASTER-OAGH | (16h 57m 31.70s , -21d 41m 24.1s) | C | 60 | 18.4 |
33623 | 2026-04-17 09:29:57 | MASTER-OAGH | (16h 58m 51.05s , -22d 14m 41.2s) | C | 60 | 18.4 |
33707 | 2026-04-17 09:31:22 | MASTER-OAGH | (16h 52m 40.16s , -19d 48m 15.7s) | C | 60 | 18.3 |
33707 | 2026-04-17 09:31:22 | MASTER-OAGH | (16h 53m 58.91s , -20d 21m 31.2s) | C | 60 | 18.2 |
33829 | 2026-04-17 09:33:24 | MASTER-OAGH | (17h 01m 02.95s , -19d 47m 31.7s) | C | 60 | 18.3 |
33829 | 2026-04-17 09:33:24 | MASTER-OAGH | (17h 02m 21.63s , -20d 20m 48.3s) | C | 60 | 18.2 |
33903 | 2026-04-17 09:34:38 | MASTER-OAGH | (16h 32m 37.41s , -21d 41m 32.3s) | C | 60 | 18.8 |
33903 | 2026-04-17 09:34:38 | MASTER-OAGH | (16h 33m 57.28s , -22d 14m 46.5s) | C | 60 | 18.4 |
34040 | 2026-04-17 09:36:54 | MASTER-OAGH | (16h 41m 08.87s , -21d 40m 50.5s) | C | 60 | 18.8 |
34040 | 2026-04-17 09:36:54 | MASTER-OAGH | (16h 42m 28.69s , -22d 14m 05.1s) | C | 60 | 18.5 |
34111 | 2026-04-17 09:38:06 | MASTER-OAGH | (16h 41m 19.27s , -17d 53m 52.1s) | C | 60 | 19.0 |
34111 | 2026-04-17 09:38:06 | MASTER-OAGH | (16h 42m 37.77s , -18d 27m 05.1s) | C | 60 | 18.8 |
34250 | 2026-04-17 09:40:25 | MASTER-OAGH | (16h 49m 38.03s , -17d 53m 08.4s) | C | 60 | 19.0 |
34250 | 2026-04-17 09:40:25 | MASTER-OAGH | (16h 50m 56.55s , -18d 26m 22.3s) | C | 60 | 18.7 |
34323 | 2026-04-17 09:41:37 | MASTER-OAGH | (16h 48m 59.07s , -21d 42m 07.0s) | C | 60 | 18.8 |
34323 | 2026-04-17 09:41:37 | MASTER-OAGH | (16h 50m 18.95s , -22d 15m 22.2s) | C | 60 | 18.5 |
34452 | 2026-04-17 09:43:47 | MASTER-OAGH | (16h 57m 30.68s , -21d 41m 25.0s) | C | 60 | 18.4 |
34452 | 2026-04-17 09:43:47 | MASTER-OAGH | (16h 58m 50.48s , -22d 14m 40.9s) | C | 60 | 18.3 |
34525 | 2026-04-17 09:45:00 | MASTER-OAGH | (16h 32m 37.27s , -21d 41m 30.9s) | C | 60 | 18.5 |
34525 | 2026-04-17 09:45:00 | MASTER-OAGH | (16h 33m 57.36s , -22d 14m 44.6s) | C | 60 | 18.4 |
34669 | 2026-04-17 09:47:23 | MASTER-OAGH | (16h 41m 07.06s , -21d 40m 49.7s) | C | 60 | 18.9 |
34669 | 2026-04-17 09:47:23 | MASTER-OAGH | (16h 42m 27.11s , -22d 14m 03.8s) | C | 60 | 18.3 |
34743 | 2026-04-17 09:48:38 | MASTER-OAGH | (16h 57m 12.13s , -17d 55m 25.8s) | C | 60 | 18.5 |
34743 | 2026-04-17 09:48:38 | MASTER-OAGH | (16h 58m 30.72s , -18d 28m 39.2s) | C | 60 | 18.4 |
34814 | 2026-04-17 09:49:49 | MASTER-OAGH | (17h 05m 40.56s , -17d 55m 27.6s) | C | 60 | 18.4 |
34814 | 2026-04-17 09:49:49 | MASTER-OAGH | (17h 06m 59.07s , -18d 28m 41.9s) | C | 60 | 18.2 |
34890 | 2026-04-17 09:51:05 | MASTER-OAGH | (16h 47m 08.33s , -16d 00m 04.5s) | C | 60 | 18.8 |
34890 | 2026-04-17 09:51:05 | MASTER-OAGH | (16h 48m 26.55s , -16d 33m 16.5s) | C | 60 | 18.4 |
34962 | 2026-04-17 09:52:16 | MASTER-OAGH | (16h 55m 21.65s , -16d 01m 22.1s) | C | 60 | 18.8 |
34962 | 2026-04-17 09:52:16 | MASTER-OAGH | (16h 56m 39.82s , -16d 34m 34.4s) | C | 60 | 18.4 |
35100 | 2026-04-17 09:54:35 | MASTER-OAGH | (16h 48m 51.47s , -21d 41m 06.9s) | C | 60 | 18.7 |
35100 | 2026-04-17 09:54:35 | MASTER-OAGH | (16h 50m 11.53s , -22d 14m 21.4s) | C | 60 | 18.2 |
35172 | 2026-04-17 09:55:47 | MASTER-OAGH | (16h 57m 36.62s , -21d 42m 25.9s) | C | 60 | 18.3 |
35172 | 2026-04-17 09:55:47 | MASTER-OAGH | (16h 58m 56.66s , -22d 15m 40.8s) | C | 60 | 18.1 |
35365 | 2026-04-17 09:59:00 | MASTER-OAGH | (16h 32m 28.88s , -21d 40m 27.7s) | C | 60 | 18.6 |
35365 | 2026-04-17 09:59:00 | MASTER-OAGH | (16h 33m 49.14s , -22d 13m 40.8s) | C | 60 | 18.5 |
35437 | 2026-04-17 10:00:12 | MASTER-OAGH | (16h 41m 11.93s , -21d 41m 48.2s) | C | 60 | 18.8 |
35437 | 2026-04-17 10:00:12 | MASTER-OAGH | (16h 42m 32.17s , -22d 15m 01.2s) | C | 60 | 18.5 |
35572 | 2026-04-17 10:02:26 | MASTER-OAGH | (16h 57m 09.74s , -17d 53m 25.2s) | C | 60 | 18.3 |
35572 | 2026-04-17 10:02:26 | MASTER-OAGH | (16h 58m 28.54s , -18d 26m 37.5s) | C | 60 | 18.2 |
35645 | 2026-04-17 10:03:39 | MASTER-OAGH | (17h 05m 40.51s , -17d 54m 44.2s) | C | 60 | 18.5 |
35645 | 2026-04-17 10:03:39 | MASTER-OAGH | (17h 06m 59.29s , -18d 27m 57.1s) | C | 60 | 18.3 |
35783 | 2026-04-17 10:05:58 | MASTER-OAGH | (16h 47m 01.28s , -15d 59m 01.9s) | C | 60 | 18.6 |
35783 | 2026-04-17 10:05:58 | MASTER-OAGH | (16h 48m 19.78s , -16d 32m 13.0s) | C | 60 | 18.5 |
35855 | 2026-04-17 10:07:09 | MASTER-OAGH | (16h 55m 27.36s , -16d 00m 20.8s) | C | 60 | 18.7 |
35855 | 2026-04-17 10:07:10 | MASTER-OAGH | (16h 56m 45.83s , -16d 33m 32.1s) | C | 60 | 18.3 |
35994 | 2026-04-17 10:09:29 | MASTER-OAGH | (16h 48m 51.27s , -21d 41m 03.9s) | C | 60 | 18.2 |
35994 | 2026-04-17 10:09:29 | MASTER-OAGH | (16h 50m 11.66s , -22d 14m 17.1s) | C | 60 | 18.0 |
36066 | 2026-04-17 10:10:40 | MASTER-OAGH | (16h 57m 33.67s , -21d 42m 23.9s) | C | 60 | 18.3 |
36066 | 2026-04-17 10:10:40 | MASTER-OAGH | (16h 58m 54.02s , -22d 15m 37.6s) | C | 60 | 18.2 |
36205 | 2026-04-17 10:13:00 | MASTER-OAGH | (16h 32m 27.34s , -21d 40m 22.7s) | C | 60 | 18.7 |
36205 | 2026-04-17 10:13:00 | MASTER-OAGH | (16h 33m 47.73s , -22d 13m 35.0s) | C | 60 | 18.5 |
36277 | 2026-04-17 10:14:12 | MASTER-OAGH | (16h 41m 10.39s , -21d 41m 43.7s) | C | 60 | 18.6 |
36277 | 2026-04-17 10:14:12 | MASTER-OAGH | (16h 42m 30.81s , -22d 14m 56.0s) | C | 60 | 18.3 |
36415 | 2026-04-17 10:16:30 | MASTER-OAGH | (16h 57m 09.16s , -17d 53m 23.0s) | C | 60 | 18.4 |
36415 | 2026-04-17 10:16:30 | MASTER-OAGH | (16h 58m 28.16s , -18d 26m 34.5s) | C | 60 | 18.3 |
36487 | 2026-04-17 10:17:42 | MASTER-OAGH | (17h 05m 39.73s , -17d 54m 43.0s) | C | 60 | 18.4 |
36487 | 2026-04-17 10:17:42 | MASTER-OAGH | (17h 06m 58.72s , -18d 27m 55.2s) | C | 60 | 18.3 |
36629 | 2026-04-17 10:20:03 | MASTER-OAGH | (16h 46m 59.46s , -15d 58m 58.3s) | C | 60 | 18.8 |
36629 | 2026-04-17 10:20:03 | MASTER-OAGH | (16h 48m 18.03s , -16d 32m 09.1s) | C | 60 | 18.5 |
36703 | 2026-04-17 10:21:18 | MASTER-OAGH | (16h 55m 25.86s , -16d 00m 18.3s) | C | 60 | 18.7 |
36703 | 2026-04-17 10:21:18 | MASTER-OAGH | (16h 56m 44.47s , -16d 33m 29.4s) | C | 60 | 18.4 |
36837 | 2026-04-17 10:23:31 | MASTER-OAGH | (16h 48m 49.03s , -21d 41m 00.1s) | C | 60 | 18.6 |
36837 | 2026-04-17 10:23:31 | MASTER-OAGH | (16h 50m 09.50s , -22d 14m 13.3s) | C | 60 | 18.3 |
36908 | 2026-04-17 10:24:43 | MASTER-OAGH | (16h 57m 32.40s , -21d 42m 21.3s) | C | 60 | 18.5 |
36908 | 2026-04-17 10:24:43 | MASTER-OAGH | (16h 58m 52.86s , -22d 15m 34.6s) | C | 60 | 18.4 |
37066 | 2026-04-17 10:27:21 | MASTER-OAGH | (16h 32m 33.54s , -21d 38m 42.0s) | C | 60 | 18.5 |
37066 | 2026-04-17 10:27:21 | MASTER-OAGH | (16h 31m 24.17s , -21d 05m 13.0s) | C | 60 | 18.2 |
37142 | 2026-04-17 10:28:37 | MASTER-OAGH | (16h 41m 16.30s , -21d 40m 15.8s) | C | 60 | 18.6 |
37142 | 2026-04-17 10:28:37 | MASTER-OAGH | (16h 40m 07.03s , -21d 06m 46.5s) | C | 60 | 18.3 |
39314 | 2026-04-17 11:04:49 | MASTER-OAGH | (16h 57m 11.67s , -17d 51m 44.4s) | C | 60 | 18.1 |
39314 | 2026-04-17 11:04:49 | MASTER-OAGH | (16h 56m 03.06s , -17d 18m 22.3s) | C | 60 | 18.0 |
39387 | 2026-04-17 11:06:01 | MASTER-OAGH | (17h 05m 42.07s , -17d 53m 17.1s) | C | 60 | 18.4 |
39387 | 2026-04-17 11:06:01 | MASTER-OAGH | (17h 04m 33.48s , -17d 19m 55.0s) | C | 60 | 18.1 |
39525 | 2026-04-17 11:08:20 | MASTER-OAGH | (16h 47m 04.61s , -15d 57m 26.8s) | C | 60 | 18.8 |
39525 | 2026-04-17 11:08:20 | MASTER-OAGH | (16h 45m 56.53s , -15d 24m 06.0s) | C | 60 | 18.5 |
39607 | 2026-04-17 11:09:42 | MASTER-OAGH | (16h 55m 29.68s , -15d 58m 54.6s) | C | 60 | 18.8 |
39607 | 2026-04-17 11:09:42 | MASTER-OAGH | (16h 54m 21.53s , -15d 25m 33.9s) | C | 60 | 18.6 |
39730 | 2026-04-17 11:11:44 | MASTER-OAGH | (16h 46m 23.07s , -23d 33m 54.5s) | C | 60 | 19.1 |
39730 | 2026-04-17 11:11:44 | MASTER-OAGH | (16h 45m 14.38s , -23d 00m 36.8s) | C | 60 | 18.6 |
39806 | 2026-04-17 11:13:01 | MASTER-OAGH | (16h 54m 59.24s , -23d 35m 22.5s) | C | 60 | 18.7 |
39806 | 2026-04-17 11:13:01 | MASTER-OAGH | (16h 53m 50.49s , -23d 02m 04.7s) | C | 60 | 18.3 |
39939 | 2026-04-17 11:15:14 | MASTER-OAGH | (16h 57m 12.00s , -17d 51m 51.3s) | C | 60 | 18.4 |
39939 | 2026-04-17 11:15:14 | MASTER-OAGH | (16h 56m 04.23s , -17d 18m 33.2s) | C | 60 | 18.1 |
40010 | 2026-04-17 11:16:25 | MASTER-OAGH | (17h 05m 41.32s , -17d 53m 18.8s) | C | 60 | 18.5 |
40010 | 2026-04-17 11:16:25 | MASTER-OAGH | (17h 04m 33.46s , -17d 20m 00.4s) | C | 60 | 18.3 |
40764 | 2026-04-17 11:28:58 | MASTER-OAGH | (16h 47m 07.63s , -15d 58m 21.3s) | C | 60 | 19.0 |
40764 | 2026-04-17 11:28:59 | MASTER-OAGH | (16h 46m 00.12s , -15d 24m 52.6s) | C | 60 | 18.6 |
40836 | 2026-04-17 11:30:11 | MASTER-OAGH | (16h 55m 24.77s , -15d 57m 26.6s) | C | 60 | 19.0 |
40836 | 2026-04-17 11:30:11 | MASTER-OAGH | (16h 54m 17.25s , -15d 23m 58.6s) | C | 60 | 18.8 |
40975 | 2026-04-17 11:32:30 | MASTER-OAGH | (16h 46m 14.22s , -23d 32m 25.7s) | C | 60 | 19.2 |
40975 | 2026-04-17 11:32:30 | MASTER-OAGH | (16h 45m 06.50s , -22d 58m 59.6s) | C | 60 | 18.6 |
41047 | 2026-04-17 11:33:42 | MASTER-OAGH | (16h 55m 05.07s , -23d 33m 56.5s) | C | 60 | 18.8 |
41047 | 2026-04-17 11:33:42 | MASTER-OAGH | (16h 53m 57.29s , -23d 00m 30.7s) | C | 60 | 18.4 |
41777 | 2026-04-17 11:45:52 | MASTER-OAGH | (17h 05m 34.84s , -17d 51m 28.6s) | C | 60 | 18.4 |
41777 | 2026-04-17 11:45:52 | MASTER-OAGH | (17h 04m 27.36s , -17d 18m 01.6s) | C | 60 | 18.0 |
41849 | 2026-04-17 11:47:03 | MASTER-OAGH | (16h 47m 07.80s , -15d 57m 31.8s) | C | 60 | 18.5 |
41849 | 2026-04-17 11:47:03 | MASTER-OAGH | (16h 46m 00.89s , -15d 24m 06.5s) | C | 60 | 18.1 |
41978 | 2026-04-17 11:49:13 | MASTER-OAGH | (16h 55m 21.03s , -15d 57m 01.0s) | C | 60 | 18.0 |
41978 | 2026-04-17 11:49:13 | MASTER-OAGH | (16h 54m 13.96s , -15d 23m 37.2s) | C | 60 | 17.9 |
42051 | 2026-04-17 11:50:26 | MASTER-OAGH | (16h 46m 19.67s , -23d 33m 05.3s) | C | 60 | 18.7 |
42051 | 2026-04-17 11:50:26 | MASTER-OAGH | (16h 45m 12.17s , -22d 59m 44.3s) | C | 60 | 18.1 |
42239 | 2026-04-17 11:53:34 | MASTER-OAGH | (16h 54m 57.43s , -23d 32m 33.4s) | C | 60 | 18.3 |
42239 | 2026-04-17 11:53:34 | MASTER-OAGH | (16h 53m 49.94s , -22d 59m 13.4s) | C | 60 | 17.9 |
42464 | 2026-04-17 11:57:19 | MASTER-OAGH | (17h 05m 18.40s , -21d 40m 12.2s) | C | 60 | 17.9 |
42464 | 2026-04-17 11:57:19 | MASTER-OAGH | (17h 04m 11.01s , -21d 06m 52.2s) | C | 60 | 17.5 |
42673 | 2026-04-17 12:00:48 | MASTER-OAGH | (16h 46m 14.08s , -23d 31m 54.8s) | C | 60 | 17.4 |
42673 | 2026-04-17 12:00:48 | MASTER-OAGH | (16h 45m 06.83s , -22d 58m 35.4s) | C | 60 | 16.9 |
42747 | 2026-04-17 12:02:02 | MASTER-OAGH | (17h 08m 38.03s , -19d 47m 26.3s) | C | 60 | 17.6 |
42747 | 2026-04-17 12:02:02 | MASTER-OAGH | (17h 07m 31.18s , -19d 14m 06.8s) | C | 60 | 17.3 |
42892 | 2026-04-17 12:04:27 | MASTER-OAGH | (16h 54m 57.84s , -23d 32m 21.8s) | C | 60 | 17.3 |
42892 | 2026-04-17 12:04:27 | MASTER-OAGH | (16h 53m 50.53s , -22d 59m 02.3s) | C | 60 | 16.8 |
43102 | 2026-04-17 12:07:57 | MASTER-OAGH | (16h 39m 31.20s , -15d 55m 41.1s) | C | 60 | 16.8 |
43102 | 2026-04-17 12:07:57 | MASTER-OAGH | (16h 38m 25.45s , -15d 22m 21.9s) | C | 60 | 16.5 |
43180 | 2026-04-17 12:09:14 | MASTER-OAGH | (17h 05m 18.13s , -21d 39m 56.8s) | C | 60 | 17.0 |
43180 | 2026-04-17 12:09:14 | MASTER-OAGH | (17h 04m 11.09s , -21d 06m 38.0s) | C | 60 | 16.5 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
[1] - V.M. Lipunov, V.G. Kornilov, E.S. Gorbovskoy, N.A. Tiurina & A.S.Kuznetsov, 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics, Lomonosov MSU PRESS, 591pp.
http : // www.pereplet.ru/lipunov/625.html
GCN Circular 44330
Subject
GRB 260417A: AstroSat CZTI detection
Date
2026-04-17T15:23:26Z (14 days ago)
From
Anuraag Arya at IIT Bombay <aryaanuraag910@gmail.com>
Via
Web form
S. Salunke (IUCAA), M. Tembhurnikar (IUCAA), Harsha K. H. (IUCAA), A. Goyal (IITB), A. Arya (IITB), 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 260417A which was also detected by Fermi GBM (Fermi GBM Team, GCN Circ. 44317).
The source was clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2026-04-17 00:10:09.33 UTC. The measured peak count rate associated with the burst is 117 (+25, -18) counts/s above the background in the combined data of all quadrants, with a total of 1532 (+379, -412) counts. The local mean background count rate was 744 (+3, -3) counts/s. We measure a T90 of 29 (+3, -15) s from the cumulative Veto light curve.
The source was also faintly detected in the 20-200 keV energy range.
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
GCN Circular 44317
Subject
GRB 260417A: Fermi GBM Final Real-time Localization
Date
2026-04-17T00:21:39Z (15 days ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely LONG GRB
At 00:10:05 UT on 17 Apr 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260417A (trigger 798077410.198084 / 260417007).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 252.0, Dec = -19.8 (J2000 degrees, equivalent to J2000 16h 48m, -19d 48'), with a statistical uncertainty of 3.4 degrees.
The angle from the Fermi LAT boresight is 81.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260417007/quicklook/glg_skymap_all_bn260417007.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260417007/quicklook/glg_healpix_all_bn260417007.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260417007/quicklook/glg_lc_medres34_bn260417007.gif