GCN Circular 20507
Subject
LIGO/Virgo G268556/GW170104: MAXI/GSC observations
Date
2017-01-23T02:51:51Z (8 years ago)
From
Motoko Serino at RIKEN/MAXI <motoko@crab.riken.jp>
M. Serino (RIKEN), N. Kawai, S.Sugita (Tokyo Tech), H. Negoro (Nihon U.),
S. Ueno, H. Tomida, S. Nakahira, 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.Isobe, T. Yoshii, Y. Tachibana, Y. Ono, T. Fujiwara, S. Harita, Y. Muraki (Tokyo Tech),
A. Yoshida, T. Sakamoto, Y. Kawakubo, 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, S. Oda (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:
We examined the MAXI/GSC all-sky X-ray images (2-20 keV) obtained
in the orbit and the day after the LVC trigger
G268556/GW170104 at 2017-01-04 10:11:58.599 UTC (GCN 20364).
In the 92-min orbit, MAXI/GSC scanned more than 80%
of the whole sky, which includes 89.3% of the
90% regions in the bayestar skymap.
One day image covers 95.2% of the 90% regions
in the bayestar skymap.
No significant new source was found in these images.
The upper limits for the X-ray flux are different depending
on the part of the sky.
For instance, typical 2-20 keV 1-sigma (3-sigma) upper limits obtained
from the one-orbit and oneday images are
19 (56) mCrab and 5 (16) mCrab, respectively.
MAXI/GSC also observed the position of GRB 170105A
(GCN Circ. 20377, 20390, 20406). The first scan after the burst
was at 2017-01-05T06:47 (UT). No significant emission was observed
at the position at the scan. The 1-sigma (3-sigma) upper limits in 2-20 keV
are 18 (54) mCrab.