TITLE: GCN CIRCULAR NUMBER: 15871 SUBJECT: GRB 140219A: MASTER before and after GRB observational arguments of the exceptionally Dark GRB DATE: 14/02/21 15:42:34 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs E. Gorbovskoy, V. Lipunov, D.Denisenko, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D.Kuvshinov Lomonosov Moscow State University, Sternberg Astronomical Institute K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory V.Krushinski, I.Zalozhnih, A. Popov Ural Federal University, Kourovka Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA) MASTER VWF robotic very wide field cameras (FOV=2x384 square degrees, D=72mm, f/1.2, 1 pix = 22 arcsec) installed on MASTER-II robotic telescope in Tunka covered full IPN error box (Hurley et. al. GCN15864) for very short time before and after the trigger. Fortunatelly we have set of 26 continous 5 seconds exposure images since 19:43:16 to 19:45:21 UT i.e. since 196 s to 71 s before the trigger and set of continous 5 seconds exposure images since 19:47:01 to 19:58:31 UT i.e. 3 sec after Notice Time and 29 s after the trigger. We haven`t found credible optical transient with 3-sigma upper limit 10.5m on single and about 12.0 m on coadd (20 x 5 sec = 100 sec) images. The Very Wide Field Cameras observation schedule with respect to GRB light curve (S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin et al., GCN 15870) is available at http://master.sai.msu.ru/static/GRB/GRB140219A_schedule.png The first images movie available here http://master.sai.msu.ru/static/GRB/GRB140219A_IPN_single.gif The coadd images move available here http://master.sai.msu.ru/static/GRB/GRB140219A_IPN_coadd1.gif http://master.sai.msu.ru/static/GRB/GRB140219A_IPN_coadd2.gif The same MASTER VWF robotic very wide field cameras installed on MASTER-II robotic telescope in Blagoveschensk also made the observations of IPN error box after the trigger. However the upper limit on them on 1.5m worse than in Tunka due to adverse weather conditions. MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Tunka was pointed to the GRB140219A 78 sec after trigger time at 2014-02-19 19:47:50.943 UT by FERMI GBM trigger N414531995 in two polarizations. On our first (10s exposure) set we haven`t found optical transient within 4 sq. degree center part of FERMI-GBM first error-box (ra=10 11 55 dec=+12 14 00 radius = 32, Zhang et. al. GCN 15866) . The 5-sigma upper limit has been about 15.1 mag. MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Blagoveschensk was pointed to the GRB140219A 30 sec after notice time and 57 sec after trigger time at 2014-02-19 19:47:29.9 UT by FERMI GBM trigger .414531995 in two polarizations. On our first (10s exposure) set we haven`t found optical transient within 4 sq. degree center part of FERMI-GBM first error-box (ra=10 11 55 dec=+12 14 00 radius = 32 ). The 5-sigma upper limit has been about 14.9 mag. After IPN notice (Hurley et. al. GCN15864) we cover full IPN and LAT (Guiriec et. al GCN 15867) error boxes in survey mode using 3 fields on two MASTER II telescope in Tunka and Blagoveschensk. The first images was obtained 18h 22m after trigger time at 2014-02-20 14:08:49 with upper limit 19.5 m in Tunka and 18.0 m in Blagoveschensk. We also haven`t found credible optical transient up to 20.5 m here. The obseravtions argue that GRB 140219A is extremely dark GRB with low Optical to Gamma Emission Ratio: F_opt/F_gamma <~ 1 : 130 000 On the figure ( http://master.sai.msu.ru/static/GRB/GRB140219A_schedule.png ) you can find the Gamma-Optic diagramm for the prompt fluence of GRBs observed by MASTER (Gorbovskoy et. al Astronomy Reports, Volume 57, Issue 4, pp.233-286). The message may be cited.