Аннотация:MASTER-OAFA robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located in Argentina was pointed to the GRB180404A (Gropp et al. GCN
22589) 21 sec after notice time and 43 sec after trigger time at
2018-04-04 00:46:18 UT.
On our first 10s exposure set we haven`t found optical transient with
17.4 5-sigma upper limit in
SWIFT XRT error-box (ra=83.549 dec=-37.17 r=4.2").
MASTER auto-detection system detected OT with RA,Dec=5h 34m 11s.66, -37d
10m 03s.5 with unfiltered m_OT=19.8
on the summary image with 660s exposition started 2018-04-04 00:46:18.938UT,
that was discovered by Swift (Gropp et al. GCN 22589) and confirmed by
VLT (Selsing et al. GCN 22591)
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The observations made on zenit distance = 42 degrees, galaxy latitude b =
-30 degree.
The moon (87 % bright part) below the horizon (The altitude of the Moon is
-1 degree ).
The sun altitude is -29.7 degree.
The message may be cited.