TITLE: GCN CIRCULAR NUMBER: 40463 SUBJECT: MAXI GRB250515.65: Global MASTER-Net observations report DATE: 25/05/16 02:52:05 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs lipunov@xray.sai.msu.ru
V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, G.Antipov, A.Sankovich, Yu.Tselik, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A.Sosnovskij (CrAO), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity), D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)
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 MAXI GRB250515.65 (trigger No 10849998,21h 14m 24.00s , -80d 30m 00.0s, R=1) errorbox 10 sec after notice time and 40345 sec after trigger time at 2025-05-16 02:41:33 UT, with upper limit up to 19.0 mag. The observations began at zenith distance = 50 deg. The sun altitude is -33.6 deg.
MASTER-OAFA robotic telescope located in Argentina (OAFA observatory of San Juan National University) started inspect of the MAXI GRB250515.65 errorbox 79 sec after notice time and 40414 sec after trigger time at 2025-05-16 02:42:42 UT, with upper limit up to 18.6 mag. The observations began at zenith distance = 61 deg. The sun altitude is -62.8 deg.
The galactic latitude b = -33 deg., longitude l = 312 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2871800
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________
40376 | 2025-05-16 02:41:33 | MASTER-SAAO | (21h 16m 32.15s , -80d 50m 43.5s) | C | 60 | 18.1 | 40436 | 2025-05-16 02:41:33 | MASTER-SAAO | (21h 16m 32.15s , -80d 50m 43.5s) | C | 180 | 19.0 | Coadd 40495 | 2025-05-16 02:42:42 | MASTER-OAFA | (20h 13m 48.68s , -81d 25m 05.7s) | C | 160 | 17.6 | 40505 | 2025-05-16 02:42:43 | MASTER-OAFA | (21h 11m 07.77s , -80d 47m 38.7s) | C | 180 | 18.6 | 40454 | 2025-05-16 02:42:52 | MASTER-SAAO | (21h 16m 31.94s , -80d 50m 47.8s) | C | 60 | 18.3 | 40534 | 2025-05-16 02:44:11 | MASTER-SAAO | (21h 16m 31.62s , -80d 50m 49.7s) | C | 60 | 18.2 | 40613 | 2025-05-16 02:45:30 | MASTER-SAAO | (21h 16m 31.26s , -80d 50m 50.6s) | C | 60 | 18.2 | Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
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