TITLE: GCN CIRCULAR NUMBER: 30331 SUBJECT: Fermi GRB 210627A: Global MASTER-Net observations report DATE: 21/06/27 17:31:26 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (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. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich, Yu. Sergienko (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 GRB 210627A ( Fermi GBM team, GCN 30330) errorbox 34547 sec after notice time and 34584 sec after trigger time at 2021-06-27 17:05:39 UT, with upper limit up to 18.0 mag. Observations started at twilight. The observations began at zenith distance = 79 deg. The sun altitude is -16.9 deg. The galactic latitude b = 51 deg., longitude l = 175 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1646025 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 28421 | 2021-06-27 15:22:27 | MASTER- | (09h 55m 25.25s , +49d 43m 07.7s) | C | 60 | 12.0 | 28501 | 2021-06-27 15:23:46 | MASTER- | (10h 09m 19.79s , +50d 48m 46.6s) | C | 60 | 17.2 | 28603 | 2021-06-27 15:25:45 | MASTER- | (10h 06m 03.52s , +50d 14m 34.0s) | C | 25 | 14.7 | 28827 | 2021-06-27 15:29:25 | MASTER- | (09h 53m 35.33s , +48d 11m 37.7s) | C | 35 | 12.5 | 28827 | 2021-06-27 15:29:25 | MASTER- | (10h 04m 46.52s , +49d 27m 54.1s) | C | 35 | 13.9 | 28875 | 2021-06-27 15:30:10 | MASTER- | (09h 30m 40.50s , +48d 08m 49.0s) | C | 40 | 13.4 | 28875 | 2021-06-27 15:30:10 | MASTER- | (09h 41m 41.44s , +49d 25m 30.7s) | C | 40 | 14.0 | 28944 | 2021-06-27 15:31:17 | MASTER- | (10h 17m 30.32s , +44d 22m 18.9s) | C | 45 | 14.9 | 29003 | 2021-06-27 15:32:15 | MASTER- | (10h 18m 57.96s , +42d 28m 45.1s) | C | 45 | 14.5 | 29262 | 2021-06-27 15:36:32 | MASTER- | (10h 04m 50.70s , +51d 20m 03.3s) | C | 50 | 14.5 | 29334 | 2021-06-27 15:37:45 | MASTER- | (09h 56m 05.11s , +44d 21m 52.9s) | C | 50 | 15.3 | 29334 | 2021-06-27 15:37:45 | MASTER- | (10h 06m 17.17s , +45d 39m 07.3s) | C | 50 | 15.9 | 29397 | 2021-06-27 15:38:47 | MASTER- | (10h 08m 04.64s , +43d 44m 11.9s) | C | 50 | 13.9 | 29468 | 2021-06-27 15:39:58 | MASTER- | (10h 16m 39.58s , +48d 09m 00.2s) | C | 50 | 14.8 | 29468 | 2021-06-27 15:39:58 | MASTER- | (10h 27m 53.40s , +49d 26m 06.9s) | C | 50 | 14.6 | 29529 | 2021-06-27 15:40:59 | MASTER- | (09h 47m 14.85s , +43d 42m 24.6s) | C | 50 | 13.8 | 29604 | 2021-06-27 15:42:14 | MASTER- | (09h 54m 38.42s , +46d 15m 13.5s) | C | 50 | 14.6 | 29604 | 2021-06-27 15:42:14 | MASTER- | (10h 05m 11.29s , +47d 32m 26.3s) | C | 50 | 16.6 | 29676 | 2021-06-27 15:43:26 | MASTER- | (09h 34m 41.92s , +44d 18m 27.6s) | C | 50 | 13.8 | 29676 | 2021-06-27 15:43:26 | MASTER- | (09h 44m 49.37s , +45d 35m 40.9s) | C | 50 | 16.9 | 29739 | 2021-06-27 15:44:29 | MASTER- | (09h 40m 37.37s , +40d 37m 56.3s) | C | 50 | 16.2 | 29739 | 2021-06-27 15:44:29 | MASTER- | (09h 50m 07.45s , +41d 55m 21.0s) | C | 50 | 16.4 | 29810 | 2021-06-27 15:45:42 | MASTER- | (09h 32m 24.62s , +46d 13m 13.9s) | C | 45 | 17.7 | 29810 | 2021-06-27 15:45:42 | MASTER- | (09h 42m 53.79s , +47d 30m 25.5s) | C | 45 | 17.4 | 29873 | 2021-06-27 15:46:45 | MASTER- | (10h 00m 42.61s , +40d 33m 37.8s) | C | 45 | 18.1 | 29873 | 2021-06-27 15:46:45 | MASTER- | (10h 10m 13.63s , +41d 50m 51.9s) | C | 45 | 17.7 | 29944 | 2021-06-27 15:47:56 | MASTER- | (09h 53m 45.96s , +48d 08m 22.2s) | C | 45 | 17.9 | 29944 | 2021-06-27 15:47:56 | MASTER- | (10h 04m 42.88s , +49d 25m 30.2s) | C | 45 | 18.0 | 30000 | 2021-06-27 15:48:52 | MASTER- | (09h 30m 39.06s , +48d 06m 02.4s) | C | 45 | 17.4 | 30000 | 2021-06-27 15:48:52 | MASTER- | (09h 41m 32.68s , +49d 23m 12.9s) | C | 45 | 17.0 | 30069 | 2021-06-27 15:50:01 | MASTER- | (10h 17m 39.78s , +44d 20m 32.3s) | C | 45 | 17.1 | 30069 | 2021-06-27 15:50:01 | MASTER- | (10h 27m 51.52s , +45d 37m 40.6s) | C | 45 | 17.8 | 30130 | 2021-06-27 15:51:00 | MASTER- | (10h 18m 58.77s , +42d 28m 12.6s) | C | 50 | 12.3 | 30130 | 2021-06-27 15:51:00 | MASTER- | (10h 28m 50.13s , +43d 45m 24.6s) | C | 50 | 17.3 | 30205 | 2021-06-27 15:52:15 | MASTER- | (10h 16m 51.62s , +46d 14m 32.9s) | C | 50 | 17.2 | 30205 | 2021-06-27 15:52:15 | MASTER- | (10h 27m 25.78s , +47d 31m 40.4s) | C | 50 | 16.3 | 30285 | 2021-06-27 15:53:32 | MASTER- | (09h 44m 15.48s , +39d 01m 44.7s) | C | 55 | 17.3 | 30285 | 2021-06-27 15:53:32 | MASTER- | (09h 53m 29.24s , +40d 19m 40.2s) | C | 55 | 16.5 | 30354 | 2021-06-27 15:54:41 | MASTER- | (10h 03m 48.49s , +38d 37m 40.5s) | C | 55 | 17.6 | 30354 | 2021-06-27 15:54:41 | MASTER- | (10h 13m 00.33s , +39d 55m 30.8s) | C | 55 | 16.3 | 30432 | 2021-06-27 15:56:00 | MASTER- | (09h 53m 23.46s , +50d 02m 19.7s) | C | 55 | 16.1 | 30432 | 2021-06-27 15:56:00 | MASTER- | (10h 04m 45.88s , +51d 20m 04.7s) | C | 55 | 15.7 | 30509 | 2021-06-27 15:57:16 | MASTER- | (09h 56m 14.00s , +44d 19m 18.1s) | C | 55 | 17.9 | 30509 | 2021-06-27 15:57:16 | MASTER- | (10h 06m 20.82s , +45d 37m 03.8s) | C | 55 | 16.5 | 30576 | 2021-06-27 15:58:21 | MASTER- | (09h 58m 06.03s , +43d 20m 01.9s) | C | 60 | 16.9 | 30576 | 2021-06-27 15:58:21 | MASTER- | (10h 08m 02.14s , +44d 37m 53.0s) | C | 60 | 16.9 | 30661 | 2021-06-27 15:59:48 | MASTER- | (10h 16m 49.25s , +48d 07m 27.6s) | C | 55 | 17.9 | 30661 | 2021-06-27 15:59:48 | MASTER- | (10h 27m 46.28s , +49d 25m 08.8s) | C | 55 | 17.5 | 30730 | 2021-06-27 16:00:57 | MASTER- | (09h 37m 28.35s , +42d 24m 40.7s) | C | 55 | 17.0 | 30730 | 2021-06-27 16:00:57 | MASTER- | (09h 47m 11.82s , +43d 42m 26.9s) | C | 55 | 16.8 | 30819 | 2021-06-27 16:02:24 | MASTER- | (09h 54m 42.62s , +46d 12m 13.3s) | C | 60 | 17.3 | 30819 | 2021-06-27 16:02:24 | MASTER- | (10h 05m 10.12s , +47d 29m 55.0s) | C | 60 | 15.0 | 30902 | 2021-06-27 16:03:47 | MASTER- | (09h 34m 49.11s , +44d 18m 31.9s) | C | 60 | 17.9 | 30902 | 2021-06-27 16:03:47 | MASTER- | (09h 44m 52.23s , +45d 36m 14.9s) | C | 60 | 17.3 | 30969 | 2021-06-27 16:04:57 | MASTER- | (09h 40m 19.67s , +43d 54m 24.8s) | C | 55 | 17.6 | 30969 | 2021-06-27 16:04:57 | MASTER- | (09h 50m 18.84s , +45d 12m 13.4s) | C | 55 | 17.2 | 31047 | 2021-06-27 16:06:14 | MASTER- | (09h 32m 29.57s , +46d 12m 40.9s) | C | 55 | 17.9 | 31047 | 2021-06-27 16:06:14 | MASTER- | (09h 42m 54.50s , +47d 30m 22.0s) | C | 55 | 17.4 | 31129 | 2021-06-27 16:07:36 | MASTER- | (10h 00m 39.50s , +43d 03m 28.8s) | C | 55 | 17.7 | 31129 | 2021-06-27 16:07:36 | MASTER- | (10h 10m 31.21s , +44d 21m 14.7s) | C | 55 | 18.0 | 31197 | 2021-06-27 16:08:45 | MASTER- | (09h 53m 45.48s , +48d 05m 44.4s) | C | 55 | 17.9 | 31197 | 2021-06-27 16:08:45 | MASTER- | (10h 04m 36.83s , +49d 23m 22.5s) | C | 55 | 17.5 | 31274 | 2021-06-27 16:10:01 | MASTER- | (09h 30m 51.08s , +48d 04m 41.0s) | C | 55 | 18.0 | 31274 | 2021-06-27 16:10:01 | MASTER- | (09h 41m 39.87s , +49d 22m 19.9s) | C | 55 | 17.6 | 31354 | 2021-06-27 16:11:21 | MASTER- | (10h 17m 40.58s , +44d 20m 28.4s) | C | 55 | 18.4 | 31354 | 2021-06-27 16:11:21 | MASTER- | (10h 27m 47.59s , +45d 38m 07.3s) | C | 55 | 18.0 | 31421 | 2021-06-27 16:12:28 | MASTER- | (10h 18m 59.84s , +42d 58m 04.5s) | C | 55 | 17.3 | 31421 | 2021-06-27 16:12:28 | MASTER- | (10h 28m 52.14s , +44d 15m 49.9s) | C | 55 | 17.3 | 31505 | 2021-06-27 16:13:50 | MASTER- | (10h 16m 59.01s , +46d 14m 26.1s) | C | 60 | 18.4 | 31505 | 2021-06-27 16:13:50 | MASTER- | (10h 27m 28.16s , +47d 32m 04.2s) | C | 60 | 17.5 | 31587 | 2021-06-27 16:15:12 | MASTER- | (09h 43m 50.24s , +43d 50m 05.3s) | C | 60 | 16.6 | 31587 | 2021-06-27 16:15:12 | MASTER- | (09h 53m 48.25s , +45d 07m 56.9s) | C | 60 | 16.0 | 33913 | 2021-06-27 16:53:59 | MASTER- | (10h 05m 22.58s , +51d 16m 29.5s) | C | 60 | 17.0 | 33913 | 2021-06-27 16:53:59 | MASTER- | (09h 53m 39.52s , +49d 59m 36.6s) | C | 60 | 17.0 | 33994 | 2021-06-27 16:55:20 | MASTER- | (10h 16m 41.76s , +49d 46m 04.9s) | C | 60 | 17.7 | 33994 | 2021-06-27 16:55:20 | MASTER- | (10h 28m 23.88s , +51d 03m 00.3s) | C | 60 | 18.0 | 34051 | 2021-06-27 16:56:36 | MASTER- | (09h 41m 22.92s , +51d 14m 09.2s) | C | 20 | 17.1 | 34051 | 2021-06-27 16:56:36 | MASTER- | (09h 29m 46.00s , +49d 56m 18.4s) | C | 20 | 17.4 | 34095 | 2021-06-27 16:57:20 | MASTER- | (10h 17m 33.94s , +49d 59m 43.6s) | C | 20 | 17.7 | 34095 | 2021-06-27 16:57:20 | MASTER- | (10h 29m 17.47s , +51d 17m 32.9s) | C | 20 | 17.1 | 34126 | 2021-06-27 16:57:51 | MASTER- | (10h 06m 15.72s , +53d 09m 16.6s) | C | 20 | 17.1 | 34126 | 2021-06-27 16:57:51 | MASTER- | (09h 54m 03.44s , +51d 51m 31.4s) | C | 20 | 17.5 | 34330 | 2021-06-27 17:01:16 | MASTER- | (10h 49m 55.35s , +47d 41m 02.4s) | C | 20 | 17.1 | 34330 | 2021-06-27 17:01:16 | MASTER- | (10h 39m 16.57s , +46d 23m 05.8s) | C | 20 | 17.3 | 34362 | 2021-06-27 17:01:47 | MASTER- | (10h 31m 03.06s , +53d 10m 56.9s) | C | 20 | 15.6 | 34362 | 2021-06-27 17:01:47 | MASTER- | (10h 19m 04.04s , +51d 53m 07.1s) | C | 20 | 16.6 | 34394 | 2021-06-27 17:02:19 | MASTER- | (10h 49m 44.61s , +43d 40m 57.2s) | C | 20 | 17.0 | 34394 | 2021-06-27 17:02:19 | MASTER- | (10h 39m 56.90s , +42d 22m 55.7s) | C | 20 | 17.6 | 34426 | 2021-06-27 17:02:51 | MASTER- | (10h 51m 03.09s , +49d 23m 10.6s) | C | 20 | 16.5 | 34426 | 2021-06-27 17:02:51 | MASTER- | (10h 40m 07.06s , +48d 05m 16.3s) | C | 20 | 16.7 | 34470 | 2021-06-27 17:03:36 | MASTER- | (09h 55m 07.00s , +53d 46m 55.0s) | C | 20 | 16.4 | 34470 | 2021-06-27 17:03:36 | MASTER- | (10h 07m 31.69s , +55d 04m 45.3s) | C | 20 | 16.0 | 34501 | 2021-06-27 17:04:06 | MASTER- | (09h 41m 23.84s , +55d 01m 36.9s) | C | 20 | 16.4 | 34501 | 2021-06-27 17:04:06 | MASTER- | (09h 29m 03.00s , +53d 43m 48.9s) | C | 20 | 17.1 | 34533 | 2021-06-27 17:04:38 | MASTER- | (09h 15m 57.59s , +53d 07m 35.3s) | C | 20 | 16.6 | 34533 | 2021-06-27 17:04:38 | MASTER- | (09h 04m 16.17s , +51d 49m 34.3s) | C | 20 | 16.6 | 34581 | 2021-06-27 17:05:27 | MASTER- | (10h 41m 34.47s , +49d 59m 32.7s) | C | 20 | 16.6 | 34581 | 2021-06-27 17:05:27 | MASTER- | (10h 52m 56.01s , +51d 17m 35.1s) | C | 20 | 15.0 | 34614 | 2021-06-27 17:05:39 | MASTER-SAAO | (10h 06m 44.41s , +37d 24m 14.8s) | C | 60 | 17.6 | 34612 | 2021-06-27 17:05:57 | MASTER- | (10h 33m 37.20s , +55d 05m 34.0s) | C | 20 | 13.8 | 34612 | 2021-06-27 17:05:57 | MASTER- | (10h 21m 11.80s , +53d 47m 38.3s) | C | 20 | 14.7 | 34643 | 2021-06-27 17:06:28 | MASTER- | (09h 57m 02.54s , +55d 39m 28.2s) | C | 20 | 16.5 | 34676 | 2021-06-27 17:07:01 | MASTER- | (09h 15m 17.18s , +54d 59m 44.6s) | C | 20 | 15.8 | 34676 | 2021-06-27 17:07:01 | MASTER- | (09h 02m 58.08s , +53d 41m 49.2s) | C | 20 | 16.4 | 34711 | 2021-06-27 17:07:16 | MASTER-SAAO | (10h 16m 40.91s , +37d 23m 07.3s) | C | 60 | 17.6 | 34710 | 2021-06-27 17:07:35 | MASTER- | (10h 44m 03.90s , +51d 52m 39.0s) | C | 20 | 12.9 | 34746 | 2021-06-27 17:08:11 | MASTER- | (09h 29m 39.46s , +55d 38m 42.3s) | C | 20 | 16.0 | 34746 | 2021-06-27 17:08:11 | MASTER- | (09h 42m 41.91s , +56d 56m 34.6s) | C | 20 | 14.8 | 34780 | 2021-06-27 17:08:45 | MASTER- | (11h 00m 48.78s , +44d 17m 13.9s) | C | 20 | 14.9 | 34832 | 2021-06-27 17:09:17 | MASTER-SAAO | (10h 22m 45.64s , +39d 18m 54.7s) | C | 60 | 17.6 | 34822 | 2021-06-27 17:09:27 | MASTER- | (11h 01m 36.55s , +46d 13m 10.3s) | C | 20 | 12.9 | 34857 | 2021-06-27 17:10:02 | MASTER- | (11h 00m 46.67s , +42d 24m 05.4s) | C | 20 | 16.0 | 34916 | 2021-06-27 17:10:41 | MASTER-SAAO | (10h 33m 04.24s , +39d 17m 15.0s) | C | 60 | 17.5 | 34971 | 2021-06-27 17:11:56 | MASTER- | (09h 40m 59.30s , +51d 12m 54.0s) | C | 20 | 16.4 | 34971 | 2021-06-27 17:11:56 | MASTER- | (09h 29m 47.69s , +49d 54m 45.1s) | C | 20 | 17.0 | 35003 | 2021-06-27 17:12:28 | MASTER- | (10h 17m 45.16s , +49d 57m 16.8s) | C | 20 | 13.5 | 35040 | 2021-06-27 17:12:45 | MASTER-SAAO | (09h 52m 06.09s , +35d 30m 51.0s) | C | 60 | 15.9 | 35034 | 2021-06-27 17:12:59 | MASTER- | (09h 54m 07.05s , +51d 51m 43.1s) | C | 20 | 14.6 | 35075 | 2021-06-27 17:13:40 | MASTER- | (09h 29m 11.24s , +51d 48m 52.4s) | C | 20 | 15.5 | 35075 | 2021-06-27 17:13:41 | MASTER- | (09h 40m 53.08s , +53d 06m 59.4s) | C | 20 | 12.3 | 35158 | 2021-06-27 17:14:43 | MASTER-SAAO | (10h 01m 50.59s , +35d 31m 43.0s) | C | 60 | 17.0 | 35143 | 2021-06-27 17:14:48 | MASTER- | (10h 49m 24.08s , +45d 35m 03.0s) | C | 20 | 14.7 | 35143 | 2021-06-27 17:14:48 | MASTER- | (10h 39m 20.29s , +44d 16m 54.0s) | C | 20 | 14.8 | 35267 | 2021-06-27 17:16:32 | MASTER-SAAO | (10h 25m 43.54s , +37d 23m 18.7s) | C | 60 | 17.5 | 35380 | 2021-06-27 17:18:25 | MASTER-SAAO | (10h 35m 51.09s , +37d 23m 18.8s) | C | 60 | 17.8 | 35475 | 2021-06-27 17:20:00 | MASTER-SAAO | (10h 10m 43.61s , +35d 29m 47.4s) | C | 60 | 17.4 | 35568 | 2021-06-27 17:21:33 | MASTER-SAAO | (10h 20m 34.10s , +35d 31m 14.3s) | C | 60 | 17.7 | 35683 | 2021-06-27 17:23:29 | MASTER-SAAO | (10h 42m 18.60s , +39d 17m 14.6s) | C | 60 | 17.7 | 35783 | 2021-06-27 17:25:08 | MASTER-SAAO | (10h 52m 43.74s , +39d 17m 13.2s) | C | 60 | 18.0 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.