GRB 170522A: Global MASTER-Net job

MASTER Tunka robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Tunka was pointed to the GRB170522A 36 sec after notice time and 136 sec after trigger time at 2017-05-22 15:47:51 UT. On our first (30s exposure) set we do not OT within GBM FERMI error-box (ra=135.417 dec=27.0394 r=1.26 see Stanbro and Meegan GCN #21126 ) brighter then 16.2. Unfortunately this observation was outside of the future Fermi LAT (Arimoto and Racusin, GCN #21127) error box. Fortunatelly, we have MASTER Very Wide field cameras on all telescopes (5-10 sec exposure on 2x380 square degrees FOV) and we have images with future Fermi LAT (Arimoto and Racusin, GCN #21127) error box. There is no OT brighter ~12 mag inside the future Fermi LAT error box. The observations made on zenit distance = 66 degrees, galaxy latitude b = 40 degree. The moon (14 % bright part) below the horizon (The altitude of the Moon is -32 degree ). Observations started at twilight. The sun altitude is -15.9 degree. The area can be observed till sunrise at 2017-05-22 21:04:48 MASTER SAAO robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in SAAO was automaticaly starting survey on the FERMI GRB170522A error-box (ra=09 01 47 dec=+27 07 12 r=1 Fermi GBM error box Stanbro and Meegan GCN #21126 ) 3186 sec after notice time and 3740 sec after trigger time at 2017-05-22 16:47:55 UT. The 5-sigma upper limit on our first (60s exposure) set is about 18.7mag No OT brighter 19.5 detected in SAAO. The observations made on zenit distance = 62 degrees, galaxy latitude b = 40 degree. The moon (14 % bright part) below the horizon (The altitude of the Moon is -39 degree ). Observations started at twilight. The sun altitude is -13.9 degree. The object can be observed till sunrise at 2017-05-23 05:22:11 Unfortunately this observation was outside of the future Fermi LAT (Arimoto and Racusin, GCN #21127) error box. MASTER-OAFA robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in OAFA automaticaly was pointed to the GRB170522A 247 sec after FERMI LAT notice time (Arimoto and Racusin, GCN #21127) and 35103 sec after trigger time at 2017-05-23 01:30:38 UT . But zenit distance was very high and we received dark images. On our 4-th image (923 sec after FERMI LAT notice time (Arimoto and Racusin, GCN #21127) and 35779 sec after trigger time at 2017-05-23 01:41:54 UT.) we found 1 short optical transient within LAT error-box (ra=139.338 dec=25.67 r=0.19) brighter then 14.5 . T-Tmid Date Time Expt. Ra Dec Mag ---------|---------------------|-------|-----------------|-----------------|------- 35869 2017-05-23 01:41:54 180 ( 9h 16m 35.3s , +25d 41m 07.4s) 13.72 This object was found only on the one image. The 5-sigma upper limit has been about 14.5 mag We did not find OT brighter 18.5 on the next images. The observations made on zenit distance = 80 degrees, galaxy latitude b = 43 degree. The moon (11 % bright part) below the horizon (The altitude of the Moon is -63 degree ). The sun altitude is -50.3 degree. The object can be observed till 2017-05-23 02:44:45 . The message may be cited.