[vsnet-grb-info 28371] Fermi trigger No 648602917: Global MASTER-Net observations report

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  30474
SUBJECT: Fermi  trigger No 648602917: Global MASTER-Net observations report 
DATE:    21/07/22 18:16:35 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

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 GRB210721.98 (trigger No 648602917,02h 06m 07.92s , -75d 13m 01.2s, R=18.57) errorbox  61639 sec after notice time and 61781 sec after trigger time at 2021-07-22 16:38:14 UT, with upper limit up to  18.4 mag. Observations started at twilight.  The observations began at zenith distance = 73 deg. The sun  altitude  is -9.1 deg. 

The galactic latitude b = -41 deg., longitude l = 297 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1667070

We obtain a following upper limits.  

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

   61812 | 2021-07-22 16:38:14 |         MASTER-SAAO | (01h 42m 48.04s , -74d 50m 50.8s) |   C |    60 | 17.4 |        
   61892 | 2021-07-22 16:39:34 |         MASTER-SAAO | (02h 13m 12.51s , -74d 50m 41.5s) |   C |    60 | 17.6 |        
   61971 | 2021-07-22 16:40:54 |         MASTER-SAAO | (01h 57m 04.63s , -76d 43m 32.7s) |   C |    60 | 17.8 |        
   62051 | 2021-07-22 16:42:13 |         MASTER-SAAO | (02h 31m 50.17s , -76d 43m 45.9s) |   C |    60 | 17.4 |        
   62132 | 2021-07-22 16:43:34 |         MASTER-SAAO | (01h 31m 20.90s , -72d 57m 06.7s) |   C |    60 | 17.5 |        
   62211 | 2021-07-22 16:44:54 |         MASTER-SAAO | (01h 58m 36.40s , -72d 55m 09.2s) |   C |    60 | 17.8 |        
   62291 | 2021-07-22 16:46:13 |         MASTER-SAAO | (02h 23m 09.94s , -72d 56m 15.5s) |   C |    60 | 17.7 |        
   62371 | 2021-07-22 16:47:33 |         MASTER-SAAO | (02h 50m 23.17s , -72d 55m 03.1s) |   C |    60 | 17.2 |        
   62450 | 2021-07-22 16:48:53 |         MASTER-SAAO | (02h 40m 33.52s , -74d 49m 38.9s) |   C |    60 | 17.7 |        
   62530 | 2021-07-22 16:50:12 |         MASTER-SAAO | (03h 07m 20.38s , -74d 46m 40.8s) |   C |    60 | 17.7 |        
   62610 | 2021-07-22 16:51:32 |         MASTER-SAAO | (02h 10m 57.04s , -78d 36m 56.7s) |   C |    60 | 17.9 |        
   62690 | 2021-07-22 16:52:52 |         MASTER-SAAO | (02h 51m 38.22s , -78d 36m 26.9s) |   C |    60 | 18.1 |        
   62770 | 2021-07-22 16:54:12 |         MASTER-SAAO | (01h 38m 55.20s , -74d 52m 06.5s) |   C |    60 | 18.2 |        
   62849 | 2021-07-22 16:55:31 |         MASTER-SAAO | (02h 09m 39.16s , -74d 50m 45.2s) |   C |    60 | 18.3 |        
   62929 | 2021-07-22 16:56:51 |         MASTER-SAAO | (01h 52m 54.37s , -76d 43m 44.8s) |   C |    60 | 18.3 |        
   63009 | 2021-07-22 16:58:11 |         MASTER-SAAO | (02h 27m 47.77s , -76d 44m 02.5s) |   C |    60 | 18.3 |        
   63089 | 2021-07-22 16:59:31 |         MASTER-SAAO | (01h 31m 16.04s , -72d 56m 56.4s) |   C |    60 | 18.0 |        
   63169 | 2021-07-22 17:00:51 |         MASTER-SAAO | (01h 58m 30.13s , -72d 56m 30.3s) |   C |    60 | 18.1 |        
   63248 | 2021-07-22 17:02:11 |         MASTER-SAAO | (02h 23m 02.52s , -72d 54m 34.5s) |   C |    60 | 18.1 |        
   63328 | 2021-07-22 17:03:30 |         MASTER-SAAO | (02h 50m 24.10s , -72d 54m 29.9s) |   C |    60 | 17.6 |        
   63408 | 2021-07-22 17:04:50 |         MASTER-SAAO | (02h 40m 28.90s , -74d 50m 00.2s) |   C |    60 | 17.8 |        
   63488 | 2021-07-22 17:06:10 |         MASTER-SAAO | (03h 11m 07.70s , -74d 48m 32.7s) |   C |    60 | 18.0 |        
   63568 | 2021-07-22 17:07:30 |         MASTER-SAAO | (02h 16m 03.02s , -78d 37m 07.4s) |   C |    60 | 18.0 |        
   63647 | 2021-07-22 17:08:49 |         MASTER-SAAO | (02h 56m 39.19s , -78d 37m 05.5s) |   C |    60 | 18.1 |        
   63727 | 2021-07-22 17:10:09 |         MASTER-SAAO | (01h 42m 29.00s , -74d 50m 49.1s) |   C |    60 | 18.1 |        
   63807 | 2021-07-22 17:11:29 |         MASTER-SAAO | (02h 12m 58.96s , -74d 50m 15.5s) |   C |    60 | 18.4 |        
   63886 | 2021-07-22 17:12:48 |         MASTER-SAAO | (01h 56m 47.09s , -76d 43m 55.7s) |   C |    60 | 18.3 |        
   63966 | 2021-07-22 17:14:08 |         MASTER-SAAO | (02h 31m 47.02s , -76d 43m 36.0s) |   C |    60 | 18.1 |        
   64046 | 2021-07-22 17:15:28 |         MASTER-SAAO | (01h 31m 16.56s , -72d 58m 53.0s) |   C |    60 | 18.0 |        
   64125 | 2021-07-22 17:16:48 |         MASTER-SAAO | (01h 58m 41.51s , -72d 57m 34.5s) |   C |    60 | 18.0 |        
   64205 | 2021-07-22 17:18:07 |         MASTER-SAAO | (02h 23m 11.67s , -72d 55m 13.2s) |   C |    60 | 18.0 |        
   64285 | 2021-07-22 17:19:27 |         MASTER-SAAO | (02h 50m 27.40s , -72d 55m 24.9s) |   C |    60 | 17.6 |        
   64365 | 2021-07-22 17:20:47 |         MASTER-SAAO | (02h 40m 43.13s , -74d 48m 29.6s) |   C |    60 | 17.8 |        
   64444 | 2021-07-22 17:22:06 |         MASTER-SAAO | (03h 11m 11.29s , -74d 48m 05.3s) |   C |    60 | 17.8 |        
   64524 | 2021-07-22 17:23:26 |         MASTER-SAAO | (02h 16m 09.54s , -78d 37m 26.3s) |   C |    60 | 18.0 |        
   64604 | 2021-07-22 17:24:46 |         MASTER-SAAO | (02h 56m 53.86s , -78d 36m 50.5s) |   C |    60 | 18.0 |        
   64683 | 2021-07-22 17:26:06 |         MASTER-SAAO | (00h 51m 00.70s , -76d 48m 08.0s) |   C |    60 | 18.0 |        
   64763 | 2021-07-22 17:27:25 |         MASTER-SAAO | (01h 25m 59.30s , -76d 45m 34.7s) |   C |    60 | 18.2 |        
   64843 | 2021-07-22 17:28:45 |         MASTER-SAAO | (00h 59m 29.74s , -78d 40m 48.4s) |   C |    60 | 17.8 |        
   64922 | 2021-07-22 17:30:05 |         MASTER-SAAO | (01h 40m 11.58s , -78d 40m 01.6s) |   C |    60 | 17.9 |        
   65002 | 2021-07-22 17:31:24 |         MASTER-SAAO | (00h 44m 45.66s , -74d 53m 56.0s) |   C |    60 | 17.8 |        
   65082 | 2021-07-22 17:32:44 |         MASTER-SAAO | (01h 15m 22.70s , -74d 53m 58.4s) |   C |    60 | 18.1 |        
   65162 | 2021-07-22 17:34:04 |         MASTER-SAAO | (02h 09m 42.03s , -71d 01m 53.6s) |   C |    60 | 17.3 |        
   65241 | 2021-07-22 17:35:23 |         MASTER-SAAO | (02h 34m 19.09s , -71d 02m 40.4s) |   C |    60 | 17.3 |        
   65321 | 2021-07-22 17:36:43 |         MASTER-SAAO | (03h 03m 33.97s , -76d 42m 45.5s) |   C |    60 | 17.9 |        
   65401 | 2021-07-22 17:38:03 |         MASTER-SAAO | (03h 38m 05.59s , -76d 40m 16.7s) |   C |    60 | 17.8 |        
   65481 | 2021-07-22 17:39:23 |         MASTER-SAAO | (01h 22m 39.00s , -71d 05m 46.1s) |   C |    60 | 17.2 |        
   65561 | 2021-07-22 17:40:43 |         MASTER-SAAO | (01h 47m 24.77s , -71d 04m 41.5s) |   C |    60 | 17.3 |        
   65640 | 2021-07-22 17:42:02 |         MASTER-SAAO | (00h 51m 04.02s , -76d 47m 23.5s) |   C |    60 | 18.0 |        
   65720 | 2021-07-22 17:43:22 |         MASTER-SAAO | (01h 26m 06.81s , -76d 47m 27.0s) |   C |    60 | 18.1 |        
   65800 | 2021-07-22 17:44:42 |         MASTER-SAAO | (00h 59m 35.94s , -78d 40m 53.9s) |   C |    60 | 17.6 |        
Filter C is a clear (unfiltred) band. 


The observation and reduction will continue. 
The message may be cited.