MASTER short OT discovery during Fermi trigger 576054086/GRB190404.29 (bright hard) inspection
ATel #12637; T. Pogrosheva, V. Lipunov, E. Gorbovskoy, N. Tyurina, V. Kornilov, D. Vlasenko, V. Vladimirov, D. Zimnukhov, A. Kuznetsov, P. Balanutsa, I. Gorbunov, A. Chasovnikov, V. Topolev, K. Zhirkov, A. Pozdnyakov, V. Grinshpun, D. Kuvshinov (Lomonosov MSU), R. Podesta, C. Lopez, C. Francile, F. Podesta (OAFA, SJNU), H. Levato (ICATE, SJNU), R. Rebolo, M. Serra, N. Lodieu(IAC), D. Buckley (SAAO), O. Gress, N. M. Budnev, O. Ershova (API ISU), V. Yurkov, A. Gabovich, Yu. Sergienko, D. Kobcev (BSPU), A. Tlatov, V. Senik, D. Dormidontov (KSS of Pulkovo observatory)
on 7 Apr 2019; 19:24 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)
Subjects: Optical, Gamma Ray, Request for Observations, Gamma-Ray Burst, Transient
MASTER OT J071404.52+550304.2 discovery in PGC020455 - short variable OT, preliminary optical counterpart of GRB190404.29
During FERMI trigger 576054086/GRB190404.29 inspection (07h 09m 04.08s,+55d 16m 01.20s, R=11.45deg. Ttrig=2019-04-04 07:01:21.93 UT)
MASTER-Tavrida auto-detection system (Global MASTER-Net http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy,vol. 2010, 30L)
discovered OT source
at (RA, Dec) = 07h 14m 04.52s +55d 03m 04.2s on 2019-04-04.78094 UT (Lipunov et al. GCN #24058).
The OT unfiltered magnitude is 18.5 (limit 19.8m). There are only 2 images (MASTER inspect mode of large error-fields observations)at this night:
Date_UT, unfiltered_mag (W=0.2B+0.8R by USNO-B1 thousands field stars)
2019-04-04 18:36:58.335 18.5 +-0.2
2019-04-04 18:44:33.528 18.3 +-0.2
There is no OT in 24h: at 2019-04-05 19:02:36UT with mlim=19.8 (MASTER-Tavrida)
This OT is in 21.2W,55.1N from the center of bright (Btc=15mag) galaxy PGC020455.
We have also reference image (without OT) on 2017-08-03.00720 UT with unfiltered magnitude limit 19.6m.
Deep photometry and spectroscopy are required.
The discovery and reference images are available at http://observ.pereplet.ru/images/MASTEROTJ071404.52+550304.2.jpg
MASTER cover map of Fermi trigger inspection is
http://observ.pereplet.ru/images/MASTERGRB180404.29map.jpg
List of Optical Transients discovered by MASTER
MASTER Global Robotic Net
