TITLE:   GCN CIRCULAR
NUMBER:  32000
SUBJECT: MAXI GRB220506.27: Global MASTER-Net observations report 
DATE:    22/05/06 10:51:21 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-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) started inspect of the MAXI GRB220506.27 (trigger No 705216502,15h 58m 04.80s , -27d 01m 58.8s, R=1) errorbox  17 sec after notice time and 14007 sec after trigger time at 2022-05-06 10:21:51 UT, with upper limit up to  14.5 mag. Observations started at twilight.  The observations began at zenith distance = 61 deg. The sun  altitude  is -10.4 deg. 

MASTER-OAGH robotic telescope  located in Mexico (OAGH National Institute for Astrophysics, Optics and Electronics) started inspect of the MAXI GRB220506.27 errorbox  65 sec after notice time and 14055 sec after trigger time at 2022-05-06 10:22:39 UT, with upper limit up to  19.0 mag. The observations began at zenith distance = 65 deg. The sun  altitude  is -24.6 deg. 

The galactic latitude b = 19 deg., longitude l = 347 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1964618

We obtain a following upper limits.  

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

   14098 | 2022-05-06 10:21:51 |         MASTER-OAFA | (15h 56m 20.10s , -27d 39m 30.9s) |   C |   180 | 14.2 |        
   14145 | 2022-05-06 10:22:39 |         MASTER-OAGH | (15h 58m 23.78s , -27d 01m 28.0s) |   C |   180 | 17.2 |        
   14145 | 2022-05-06 10:22:39 |         MASTER-OAGH | (15h 57m 44.41s , -26d 31m 55.4s) |  P- |   180 | 18.0 |        
   14309 | 2022-05-06 10:25:23 |         MASTER-OAFA | (15h 56m 19.20s , -27d 38m 28.7s) |   C |   180 | 14.5 |        
   14346 | 2022-05-06 10:26:00 |         MASTER-OAGH | (15h 58m 19.03s , -27d 02m 20.6s) |   C |   180 | 17.8 |        
   14346 | 2022-05-06 10:26:00 |         MASTER-OAGH | (15h 57m 39.36s , -26d 32m 47.2s) |  P- |   180 | 18.6 |        
   14548 | 2022-05-06 10:29:21 |         MASTER-OAGH | (15h 58m 18.27s , -27d 01m 28.1s) |   C |   180 | 17.8 |        
   14548 | 2022-05-06 10:29:21 |         MASTER-OAGH | (15h 57m 38.30s , -26d 31m 54.5s) |  P- |   180 | 19.0 |        
   14749 | 2022-05-06 10:32:43 |         MASTER-OAGH | (15h 58m 24.66s , -27d 02m 32.0s) |   C |   180 | 17.8 |        
   14749 | 2022-05-06 10:32:43 |         MASTER-OAGH | (15h 57m 44.41s , -26d 32m 58.0s) |  P- |   180 | 19.0 |        
   14890 | 2022-05-06 10:36:04 |         MASTER-OAGH | (15h 53m 44.48s , -27d 19m 10.1s) |   C |    60 | 17.5 |        
   14890 | 2022-05-06 10:36:04 |         MASTER-OAGH | (15h 53m 03.60s , -26d 49m 36.0s) |   C |    60 | 18.4 |        
Filter C is a clear (unfiltred) band. 


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