TITLE:   GCN CIRCULAR
NUMBER:  33632
SUBJECT: Fermi  trigger No 703284533: Global MASTER-Net observations report 
DATE:    23/04/15 21:45:34 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, 
G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov,  D.Cheryasov, Ya.Kechin
(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
(Irkutsk State University, API),

L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez 
(INAOE, Guillermo Haro Astrophysics Observatory),

A. Tlatov, D. Dormidontov 
(Kislovodsk Solar Station of the Pulkovo Observatory),

A. Gabovich, V.Yurkov 
(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 GRB230415.87 (trigger No 703284533,09h 58m 14.40s , -10d 45m 36.0s, R=3.64) errorbox  2748 sec after notice time and 2779 sec after trigger time at 2023-04-15 21:35:08 UT, with upper limit up to  19.5 mag. The observations began at zenith distance = 41 deg. The sun  altitude  is -63.4 deg. 

MASTER-Kislovodsk robotic telescope  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB230415.87 errorbox  2762 sec after notice time and 2794 sec after trigger time at 2023-04-15 21:35:22 UT, with upper limit up to  18.2 mag. The observations began at zenith distance = 76 deg. The sun  altitude  is -36.9 deg. 

The galactic latitude b = 34 deg., longitude l = 250 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2210411

We obtain a following upper limits.  

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

    2870 | 2023-04-15 21:35:08 |         MASTER-SAAO | (10h 00m 26.11s , -10d 38m 01.2s) |   C |   180 | 19.4 |        
    2870 | 2023-04-15 21:35:08 |         MASTER-SAAO | (09h 54m 36.09s , -10d 38m 55.3s) |   C |   180 | 19.4 |        
    2884 | 2023-04-15 21:35:22 |   MASTER-Kislovodsk | (09h 59m 06.22s , -10d 45m 54.8s) |   C |   180 | 17.9 |        
    2884 | 2023-04-15 21:35:22 |   MASTER-Kislovodsk | (09h 55m 14.29s , -10d 25m 38.5s) |   C |   180 | 18.2 |        
    3069 | 2023-04-15 21:38:27 |         MASTER-SAAO | (10h 00m 17.42s , -10d 38m 51.8s) |   C |   180 | 19.5 |        
    3069 | 2023-04-15 21:38:27 |         MASTER-SAAO | (09h 54m 27.98s , -10d 39m 46.2s) |   C |   180 | 19.5 |        
Filter C is a clear (unfiltred) band. 


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