GRB 160814A

Y. Kawakubo (AGU), M. Serino (RIKEN), T. Sakamoto (AGU), S. Nakahira (JAXA),
H. Negoro (Nihon U.), S. Ueno, H. Tomida, M. Ishikawa, Y. Sugawara (JAXA),
Y. E. Nakagawa (JAMSTEC), T. Mihara, M. Sugizaki, W. Iwakiri, M. Shidatsu,
J. Sugimoto, T. Takagi, M. Matsuoka (RIKEN), N. Kawai, N. Isobe, S. Sugita,
T. Yoshii, Y. Tachibana, Y. Ono, T. Fujiwara, S. Harita, Y. Muraki (Tokyo Tech),
A. Yoshida, Y. Kitaoka (AGU), H. Tsunemi, R. Shomura (Osaka U.), M. Nakajima,
K. Tanaka, T. Masumitsu, T. Kawase (Nihon U.), Y. Ueda, T. Kawamuro, T. Hori,
A. Tanimoto (Kyoto U.), Y. Tsuboi, Y. Nakamura, R. Sasaki (Chuo U.), M. Yamauchi,
K. Furuya (Miyazaki U.), K. Yamaoka (Nagoya U.)
report on behalf of the MAXI team:
  
The MAXI/GSC nova-alert system triggered a bright uncatalogued X-ray transient
source at 21:12:55 UT on 2016 August 14.  We obtain a rectangular error box for
the transient source at the center position of

  (R.A., Dec) = (136.074 deg, -20.960 deg) = (09 04 17, -20 57 36) (J2000)

with the following corners:

  (136.030, -21.250) deg = (09 04 07, -21 14 59) (J2000)
  (135.790, -21.121) deg = (09 03 09, -21 07 16) (J2000)
  (136.304, -20.423) deg = (09 05 12, -20 25 23) (J2000)
  (136.542, -20.552) deg = (09 06 10, -20 33 08) (J2000)

There is an additional systematic uncertainty of 0.1 deg (90% containment radius).
  
The X-ray flux averaged over the scan was 413 +- 40 mCrab (4.0-10.0keV, 1 sigma error).
There was no significant excess flux in the previous transit at 19:40 and in the next
transit at 22:45 UT with an upper limit of 20 mCrab for each.

A.Kozlova, S. Golenetskii, R.Aptekar, D. Frederiks, P. Oleynik,
M. Ulanov, D. Svinkin, A. Tsvetkova, A.Lysenko,
and T. Cline on behalf of the Konus-Wind team, report:

GRB 160814A, localized by MAXI/GSC (Kawakubo et al., GCN 19793
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 )
was detected by Konus-Wind in the waiting mode.

The burst light curve shows a double-peaked structure,
started at ~T0(MAXI)-70.3 s with a total duration of ~ 71 s.

The K-W light curve of this burst is available at
http://www.ioffe.rssi.ru/LEA/GRBs/GRB160814A/

As observed by Konus-Wind, the burst had a fluence of
5.5(-0.3,+0.7)x10^-6 erg/cm2 and a 2.944-s peak flux,
measured from ~T0(MAXI)-11.4 s, of 4.3(-0.6,+0.8)x10^-7 erg/cm2/s
(both in the 20 - 1000 keV energy range).

Modeling the K-W 3-channel time-integrated spectrum
(from ~T0(MAXI)-70.3 s to ~T0(MAXI)+0.4 s)
by a simple power-law model yields a power law
index of -2.2(-0.1,+0.1), chi2=1.3/1 dof.

All the quoted errors are estimated at the 1 sigma confidence level.
All the presented results are preliminary.

M. L. Cherry (LSU), A. Yoshida, T. Sakamoto, Y. Kawakubo, M. Moriyama,
Y. Yamada (AGU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA), I. Takahashi (IPMU),
Y. Asaoka, S. Ozawa, S. Torii (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U),
W. Ishizaki (ICRR), S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena)
and the CALET collaboration:

The long-duration GRB 160814A (Kawakubo et al., GCN Circ. 19793
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 ;
Kozlova et al., GCN Circ. 19800
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 ) triggered the CALET Gamma-ray Burst Monitor
(CGBM) at 21:12:42.39 on 14 August 2016.  The burst signal was seen by
all CGBM instruments.  Because of a problem in one of the ground alert processing
computer, the GCN notice was not distributed automatically for this event.

The light curve of the SGM shows two episodes.  The first weak episode
starts from T-60 sec, peaks at T-55 sec and ends at T-50 sec.  The
second episode starts from T+1 sec, peaks at T+3 sec and ends at T+12 sec.
The T90 duration measured by the SGM data is 10 +- 1 sec (40-230 keV).

The light curve is available at

http://cgbm.calet.jp/cgbm_trigger/flight/1155244227/

The CALET data used in this analysis are provided by the Waseda
CALET Operation Center located at the Waseda University.

N.L.Dzhioeva, V.V.Bogomolov, S.I.Svertilov,
A.M.Amelushkin, V.O.Barinova, M.I.Panasyuk, A.V.Bogomolov, A.F.Iyudin,
V.V.Kalegaev, D.Nguen,  V.L. Petrov, I.V.Yashin, P.S.Kazarian
Physics Department, Skobel`tsyn Institute of Nuclear Physics, Lomonosov Moscow
State University

V. Lipunov, E.S. Gorbovskoy, N.Tyurina, D.Kuvshinov
Lomonosov Moscow State University, Sternberg Astronomical Institute

I. Park, J. Lee, S. Jeong
Department of Physics, Sungkyunkwan University, Seobu-ro, Jangangu, Suwonsi,
Korea

A. J. Castro-Tirado
Instituto de Astrofisica de Andalucia (IAA-CSIC) and Universidad de Malaga, 
Spain


As a result of reprocessing, GRB160814A was found.
At 21:12:42 UT on 14 Aug 2016, the Lomonosov BDRG Gamma-ray Burst
Monitor (http://lomonosov.sinp.msu.ru/en/scientific-equipment-2/bdrg
[1]),
detected GRB160814A (Y. Kawakubo (AGU), GCN 19793
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 ):
total duration ~25s,the energy range 20-170 keV.

LC is available at:

https://downloader.sinp.msu.ru/static/grb_catalog/lc/grb_20160814_211242.png
[2]

More information is available at:
https://downloader.sinp.msu.ru/grb_catalog/ [3]
This Notice was ground-generated.



The message may be cited.