GRB 181008B

D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Kozlova,
and T. Cline on behalf of the Konus-Wind team,

K. Hurley, on behalf of the IPN,

A. Goldstein, M. S. Briggs, and C. Wilson-Hodge
on behalf of the Fermi GBM team,

A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo,
and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,

and

S. Barthelmy, J. Cummings, H. Krimm, and D. Palmer,
on behalf of the Swift-BAT team, report:

The long-duration GRB 181008B was detected by
Fermi (GBM; trigger 560725347), Konus-Wind, Swift (BAT)
and INTEGRAL (SPI-ACS), at about 75743 s UT (21:02:23).
The burst was outside the coded field of view of the BAT.

We have triangulated this GRB to a Konus-GBM annulus centered at 
RA(2000)=173.995 deg (11h 35m 59s)  Dec(2000)=+4.777 deg (+4d 46' 38"), 
whose radius is 70.040 +/- 2.099 deg (3 sigma).

The annulus combined with the Fermi-GBM final position
3 sigma error circle gives the following error box:
---------------------------------
  RA(2000), deg   Dec(2000), deg
---------------------------------
  Center:
    112.6582      -35.4039
  Corners:
    110.7043      -23.9434
    105.1913      -20.9537
    119.7336      -50.4173
    121.7709      -44.6724
--------------------------------
The error box area is 116 sq. deg, and its maximum
dimension is 31.6 deg (the minimum one is 4.2 deg).
The Sun distance was about 62 deg.

This box may be improved.

A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB180728_T76197/IPN

This box was submitted for observation by the MASTER-Net robotic
telescope network (http://observ.pereplet.ru; Lipunov et al., 2010,
Advances in Astronomy, vol. 2010, 30L).

The time history and spectrum will be given in forthcoming
GCN Circulars.

V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, 
N.Tyurina, P.Balanutsa,A.Kuznetsov, V.V.Chazov, D. Vlasenko
Lomonosov Moscow State University, Sternberg Astronomical Institute

D.Svinkin (Ioffe Institute, Russia)

R. Podesta, F. Podesta, C. Lopez, C.Francile
Observatorio Astronomico Felix Aguilar (OAFA)

Hugo Levato Instituto de Ciencias Astronomicas, de la Tierra y del Espacio 
(ICATE)

R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres
The Instituto de Astrofisica de Canarias

D. Buckley,
South African Astronomical Observatory

A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov
Kislovodsk Solar Station of the Pulkovo Observatory

O. Gres, N.M. Budnev, Yu.Ishmuhametova
Applied Physics Institute of Irkutsk State University

V. Yurkov, A. Gabovich, Yu. Sergienko
Blagoveschensk Educational State University, Blagoveschensk


MASTER-SAAO robotic telescope (MASTER-Net: http://observ.pereplet.ru, 
Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in 
South Africa (South African Astronomical Observatory) was starting survey 
on the IPN  GRB181008.88  error-box (Svinkin et al., GCN 23318
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 ) 
26827 sec after notice time and 1 days 8072 sec after trigger time at 
2018-10-09 23:19:04 UT. The 5-sigma upper limit on our first (180s 
exposure)  set is about 19.0 mag
Link to GRB181008.88 page: 
https://master.sai.msu.ru/site/master2/ligo.php?af=1&wh=tabs(grbtime-'2018-10-08+21:04:32')%3C'1+minutes'::interval
The message may be cited.


The galactic latitude b = -60 deg., longitude l = 98 deg.
The observations made on zenit distance = 42 deg.The moon ( 1 % bright 
part) below the horizon (The altitude of the Moon is -52 deg. ).
The sun  altitude  is -49.0 deg.
The object can be observed till 2018-10-10 03:24:40



MASTER-Kislovodsk robotic telescope (MASTER-Net: 
http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, 
vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station 
of Pulkovo observatory) was starting survey on the IPN  GRB181008.88 
error-box   28923 sec after notice time 
and 1 days 10168 sec after trigger time at 2018-10-09 23:54:00 UT. The 
5-sigma upper limit on our first (180s exposure)  set is about 17.4 mag
Link to GRB181008.88 page: 
https://master.sai.msu.ru/site/master2/ligo.php?af=1&wh=tabs(grbtime-'2018-10-08+21:04:32')%3C'1+minutes'::interval
The message may be cited.

The observations made on zenit distance = 69 deg.The moon ( 1 % bright 
part) below the horizon (The altitude of the Moon is -43 deg. ).
The sun  altitude  is -36.1 deg.
The object can be observed till 2018-10-10 01:57:56

MASTER-Tavrida robotic telescope (MASTER-Net: http://observ.pereplet.ru, 
Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in 
Russia (Lomonosov MSU, SAI Crimea astronomical station) was starting 
survey on the IPN  GRB181008.88 error-box   32631 sec after notice time and 1 days 13876 sec after trigger 
time at 2018-10-10 00:55:48 UT. The 5-sigma upper limit on our first (180s 
exposure)  set is about 17.9 mag

The galactic latitude b = -60 deg., longitude l = 98 deg.
The observations made on zenit distance = 74 deg.The moon ( 1 % bright 
part) below the horizon (The altitude of the Moon is -39 deg. ).
The sun  altitude  is -31.3 deg.
The object can be observed till 2018-10-10 02:32:31


MASTER-OAFA robotic telescope (MASTER-Net: http://observ.pereplet.ru, 
Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in 
Argentina (OAFA observatory of San Juan National University) was starting 
survey on the IPN  GRB181008.88 error-box   1 days 33629 sec after trigger time at 2018-10-10 03:35:27 UT. 
The 5-sigma upper limit on our 3-th (180s exposure)  set is about 17.6 mag
Link to GRB181008.88 page: 
https://master.sai.msu.ru/site/master2/ligo.php?af=1&wh=tabs(grbtime-'2018-10-08+21:04:32')%3C'1+minutes'::interval
The message may be cited.


The galactic latitude b = -60 deg., longitude l = 98 deg.
The observations made on zenit distance = 32 deg.The moon ( 1 % bright 
part) below the horizon (The altitude of the Moon is -44 deg. ).
The sun  altitude  is -50.0 deg.
The object can be observed till 2018-10-10 09:24:14

The total MASTER cover map is available at 
http://master.sai.msu.ru/static//IPN/db/GRB181008.88/img/ligo_master_2018-10-10-08-31-15.eb.zoom.1.png

MASTER OT J075512.66-414512.0 detection - long variable star

MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic 
Net", Advances in Astronomy, 2010, 30L )
  discovered OT source at (RA, Dec) = 07h 55m 12.66s -41d 45m 12.0s on 
2018-10-09.99672 UT.
The OT unfiltered magnitude is 12.2m (mlim=19.0).
The OT is seen in 4 images.
This OT was observed at MASTER-OAFA on 2017-09-23 08:08:47 with unfiltered 
m_OT=12.4.
We have reference image on  on 2015-01-11 21:25:04.129 UT with  unfiltered 
m_OT=14.9m (MASTER-SAAO).

The discovery and reference images are available at
http://master.sai.msu.ru/static/OT/075512.66-414512.0.png

This message can be cited.