TITLE:   GCN CIRCULAR
NUMBER:  28275
SUBJECT: GRB 200815A: MASTER optical observations
DATE:    20/08/20 20:09:03 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

V. Lipunov,  E. Gorbovskoy, V.Kornilov, N.Tyurina, K.Zhirkov,P.Balanutsa,A.Kuznetsov,F.Balakin,
V.Vladimirov, A.Chasovnikov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Topolev, V.Senik, T.Pogrosheva,
D.Kuvshinov(Lomonosov Moscow State University, SAI, Physics Department),
D. Buckley(South African Astronomical Observatory),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
R. Podesta, C.Lopez, F. Podesta, C.Francile(Observatorio Astronomico Felix Aguilar OAFA),
H.Levato(Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE),
R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias),
O.A. Gres, N.M. Budnev (Irkutsk State University, API),
A. Gabovich, Yu. Sergienko, V.Yurkov (Blagoveschensk Educational State University)


MASTER Global Robotic Net  (Lipunov et al., 2010, Advances in Astronomy, vol. 2010, p.30L)
started  GRB 2008015A (IPN triangulation, Hurley et al. GCN 28274) errorbox observations
22881 sec after notice time (1 days 3261 sec after trigger time) at 
2020-08-16 21:57:09 UT in MASTER-Tavrida, with upper limit up to  19.0 mag.
The observations began at zenith distance = 76 deg. The sun  altitude  was -32.5 deg.

MASTER-IAC robotic telescope  located in Spain (IAC Teide Observatory) 
started inspect of the IPN GRB200815.88 errorbox  26435 sec after notice 
time and 1 days 6815 sec after trigger time at 2020-08-16 22:56:23 UT, 
with upper limit up to  17.4 mag. The observations began at zenith 
distance = 82 deg. The sun  altitude  is -37.9 deg.

The galactic latitude b = -60 deg., longitude l = 98 deg.
We didn't find OT.

Real time updated cover map is available here:
https://master.sai.msu.ru/site/master2/ligo_1.php?id=11510

We obtained the following upper limits.

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

    89752 | 2020-08-16 21:57:09 |      MASTER-Tavrida | (23h 39m 20.64s , -28d 07m 25.9s) |   C |   180 | 19.0 |
    89952 | 2020-08-16 22:00:30 |      MASTER-Tavrida | (23h 48m 25.29s , -28d 08m 52.4s) |   C |   180 | 18.8 |
    90803 | 2020-08-16 22:14:41 |      MASTER-Tavrida | (23h 48m 28.58s , -28d 07m 39.8s) |   C |   180 | 18.9 |
    93305 | 2020-08-16 22:56:23 |          MASTER-IAC | (23h 45m 32.32s , -28d 00m 54.2s) |   C |   180 | 17.1 |
    93915 | 2020-08-16 23:06:33 |          MASTER-IAC | (23h 45m 29.43s , -28d 00m 38.4s) |   C |   180 | 17.4 |
Filter C is a clear (unfiltred) band.

Cover map is available at
     http://master.sai.msu.ru/static/images/MASTERGRB200815Acmap.png

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