GCN Circular 30661
Subject
Swift GRB 210818A: Global MASTER-Net observations report
Date
2021-08-19T01:06:55Z (3 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@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-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) was pointed to the Swift GRB 210818A ( A. P. Beardmore et al., GCN 30652) errorbox 22995 sec after notice time and 23077 sec after trigger time at 2021-08-18 07:27:44 UT, with upper limit up to 18.9 mag. The observations began at zenith distance = 62 deg. The sun altitude is -47.3 deg.
The galactic latitude b = -25 deg., longitude l = 301 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=1693376
We obtain a following upper limits.
Tmid-T0 | Site |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________
23167 | MASTER-OAFA | C | 180 | 13.8 |
23347 | MASTER-OAFA | C | 540 | 14.9 | Coadd
23379 | MASTER-OAFA | C | 180 | 14.9 |
23559 | MASTER-OAFA | C | 540 | 15.3 | Coadd
23592 | MASTER-OAFA | C | 180 | 14.6 |
23812 | MASTER-OAFA | C | 180 | 14.3 |
24026 | MASTER-OAFA | C | 180 | 14.8 |
24242 | MASTER-OAFA | C | 180 | 15.8 |
24456 | MASTER-OAFA | C | 180 | 15.0 |
24636 | MASTER-OAFA | C | 540 | 17.0 | Coadd
24668 | MASTER-OAFA | C | 180 | 14.9 |
24883 | MASTER-OAFA | C | 180 | 16.4 |
25099 | MASTER-OAFA | C | 180 | 17.3 |
25279 | MASTER-OAFA | C | 540 | 18.0 | Coadd
25329 | MASTER-OAFA | C | 180 | 17.4 |
25546 | MASTER-OAFA | C | 180 | 17.4 |
25762 | MASTER-OAFA | C | 180 | 16.9 |
25942 | MASTER-OAFA | C | 540 | 18.0 | Coadd
25975 | MASTER-OAFA | C | 180 | 18.0 |
26190 | MASTER-OAFA | C | 180 | 17.3 |
26405 | MASTER-OAFA | C | 180 | 17.3 |
26585 | MASTER-OAFA | C | 540 | 17.6 | Coadd
26621 | MASTER-OAFA | C | 180 | 17.7 |
26833 | MASTER-OAFA | C | 180 | 17.5 |
27049 | MASTER-OAFA | C | 180 | 17.7 |
27229 | MASTER-OAFA | C | 540 | 18.3 | Coadd
27264 | MASTER-OAFA | C | 180 | 17.5 |
27479 | MASTER-OAFA | C | 180 | 17.7 |
27691 | MASTER-OAFA | C | 180 | 17.5 |
27871 | MASTER-OAFA | C | 540 | 18.5 | Coadd
27906 | MASTER-OAFA | C | 180 | 17.6 |
28123 | MASTER-OAFA | C | 180 | 18.2 |
28337 | MASTER-OAFA | C | 180 | 17.7 |
28517 | MASTER-OAFA | C | 540 | 18.1 | Coadd
28551 | MASTER-OAFA | C | 180 | 17.3 |
28765 | MASTER-OAFA | C | 180 | 18.0 |
28983 | MASTER-OAFA | C | 180 | 18.0 |
29199 | MASTER-OAFA | C | 180 | 17.9 |
29415 | MASTER-OAFA | C | 180 | 17.7 |
29595 | MASTER-OAFA | C | 540 | 18.0 | Coadd
29630 | MASTER-OAFA | C | 180 | 17.5 |
29810 | MASTER-OAFA | C | 540 | 18.6 | Coadd
29842 | MASTER-OAFA | C | 180 | 18.2 |
30058 | MASTER-OAFA | C | 180 | 18.4 |
30272 | MASTER-OAFA | C | 180 | 18.2 |
30488 | MASTER-OAFA | C | 180 | 17.8 |
30701 | MASTER-OAFA | C | 180 | 18.0 |
30881 | MASTER-OAFA | C | 540 | 18.9 | Coadd
30917 | MASTER-OAFA | C | 180 | 18.1 |
31130 | MASTER-OAFA | C | 180 | 18.3 |
31329 | MASTER-OAFA | C | 180 | 18.3 |
31729 | MASTER-OAFA | C | 180 | 18.4 |
31909 | MASTER-OAFA | C | 540 | 18.5 | Coadd
31928 | MASTER-OAFA | C | 180 | 18.4 |
32127 | MASTER-OAFA | C | 180 | 18.0 |
32327 | MASTER-OAFA | C | 180 | 17.4 |
32507 | MASTER-OAFA | C | 540 | 18.0 | Coadd
32527 | MASTER-OAFA | C | 180 | 17.3 |
32726 | MASTER-OAFA | C | 180 | 17.1 |
32926 | MASTER-OAFA | C | 180 | 17.3 |
33106 | MASTER-OAFA | C | 540 | 17.9 | Coadd
33125 | MASTER-OAFA | C | 180 | 17.5 |
33325 | MASTER-OAFA | C | 180 | 17.1 |
33524 | MASTER-OAFA | C | 180 | 16.7 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.