MASTER OT J080207.73+352847.7 discovery - optical afterglow of very bright GRB190530A

ATel #12824; D. Vlasenko, V. Lipunov (Lomonosov MSU), D. Svinkin (Ioffe Institute), J. Greiner (MPG, Germany), O. Gress, I. Gorbunov, A. Kuznetsov, E. Gorbovskoy, P. Balanutsa, N. Tiurina, V. Kornilov, V. Vladimirov, D. Zimnukhov, F. Balakin, A. Chasovnikov, V. Topolev, V. Senik, V. Grinshpun, T. Pogrosheva, D. Kuvshinov (Lomonosov MSU), V. Yurkov, A. Gabovich, Yu. Sergienko, D. Kobcev (BSPU), N. M. Budnev, O. Ershova (API ISU), A. Tlatov, D. Dormidontov, A. V. Parhomenko (KSS of the Pulkovo Observatory), R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres (The Instituto de Astrofisica de Canarias), D. Buckley (SAAO), R. Podesta, C. Lopez, C. Francile, F. Podesta (OOAFA, SJNU), H. Levato (ICATE, SJNU), V. Shumkov
on 31 May 2019; 12:42 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER Global Robotic Net (Lipunov et al., 2010, Advances in Astronomy,vol.2010, 30L)
observed extremaly bright (3.7062e-04 erg/cm^2, Ttrig=2019-05-30 10:19:08.9UT, Bissaldi et al. GCN #24692)
Fermi GRB 190530A (GBM team GCN #24676, BALROG Biltzinger et al.GCN #24677, LAT Longo et al. GCN #24679 and IPN localization; gamma-ray transient also detected by AGILE 8s later Lecarelli et al. GCN #24678, Verrecchia et al. GCN #24683)
by MASTER-Amur, MASTER-Tunka, MASTER-SAAO, MASTER-Kislovodsk, MASTER-Tavrida, MASTER-IAC (Lipunov et al. GCN #24680, GCN #24693).

MASTER auto-detection system discovered GRB optical counterpart
MASTER OT J080207.73+352847.7 = AT 2019gdw
at (RA,Dec2000)=08h 02m 07.73s +35d 28m 47.7s ( Lipunov et al. GCN #24680)
with m_OT=16.7 ( W=0.2B+0.8R calibrated by thousands USNO-B1 stars) at 2019-05-30 18:12:10UT.

MASTER-Amur robotic telescope automatically was pointed to the Fermi GRB190530A BALROG localization at 2019-05-30 14:34:09 (error-box altitude = 13 deg., sun_alt=-17deg. very cloudy weather at sunset) with automatic photometry m_OT ~ 14.8
MASTER-Tunka robotic telescope automatically was pointed to the GRB190530A at 2019-05-30 14:43:13UT (error_box_alt=26deg., sun_alt=-10deg.), automatic photometry m_OT ~ 16.5
MASTER-SAAO robotic telescope automatically was pointed to the GRB190530A at 2019-05-30 16:34:41UT (very cloudy all horizont, error-box_alt=13.5 and go down, sun_alt=-11) mlim=14.5
MASTER-Kislovodsk robotic telescope automatically was pointed to the GRB190530A at 2019-05-30 18:12:10 (sun altitute= -16deg., alert_altitute=23deg.) automatic photometry m_OT~16.7
MASTER-Tavrida robotic telescope automatically was pointed to the GRB190530A at 2019-05-30 2019-05-30 18:12:17 (sun altitute= -8deg., alert_altitute=34deg.) automatic photometry m_OT~16.7
MASTER-IAC robotic telescope automatically was pointed to the GRB190530A at 2019-05-30 20:50:32UT (sun altitute=-11 deg., alert_altitute=36 deg.) automatic photometry m_OT~17.4

The covered map by MASTER and OT position are available at https://master.sai.msu.ru/site/master2/event.php?id=1034468

The optical counterpart was also detected by OSN (Kann et al. GCN #24684), NOT (Heintz et al. GCN #24686), OAJ (Izzo et al. GCN #24687), GWAC-F30 (Xin et al. GCN #24688), COATLI (Watson et al. GCN #24690).

The X-ray counterpart was detected by Swift (Melandri et al. GCN #24689).

Specroscopy: NOT (Heintz et al. GCN #24686) infered an upper limit on the redshift of z < 2.2

Deep

MASTER Global Robotic Net