Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 14359

GRB 130407A: MAXI/GSC detection
2013-04-08T03:30:03Z (11 years ago)
Motoko Suzuki at RIKEN <>
K. Fukushima, M. Nakajima, H. Negoro (Nihon U.), M. Serino (RIKEN), 
S. Ueno, H. Tomida, S. Nakahira, M. Kimura, M. Ishikawa (JAXA), 
T. Mihara, M. Sugizaki, M. Morii, T. Yamamoto, J. Sugimoto, T. Takagi, M. Matsuoka (RIKEN), 
N. Kawai, R. Usui, K. Ishikawa, T. Yoshii (Tokyo Tech), 
A. Yoshida, T. Sakamoto, Y. Nakano (AGU), 
H. Tsunemi, M. Sasaki (Osaka U.), 
T. Onodera, K. Suzuki (Nihon U.), 
Y. Ueda, M. Shidatsu, T. Kawamuro (Kyoto U.), 
Y. Tsuboi, M. Higa (Chuo U.), 
M. Yamauchi, K. Yoshidome, Y. Ogawa, H. Yamada (Miyazaki U.), 
K. Yamaoka (Nagoya U.) report on behalf of the MAXI team

At 2013-04-07T23:37:01 UT, the MAXI/GSC nova alert system triggered on 
a bright uncatalogued X-ray transient source.
The transient emission started at and lasted at least 25 seconds
within the 41 second long triangular transit response of
MAXI/GSC. We identify this event as GRB 130407A.

Assuming that the source flux was constant over the transit,
we obtain the source position at

 (R.A., Dec) = (248.10 deg, 10.51 deg) = (16 32 23, +10 30 39) (J2000)

with a 90% C.L. statistical error of 0.2 deg and an additional systematic 
uncertainty of 0.1 deg (90% containment radius). The 4-10 keV flux was 
170 +- 30 mCrab.

There was no significant excess flux in the previous transit at 22:04UT 
and in the next transit at 4/8 01:10 UT with an upper limit of 20 mCrab for each.
Looking for U.S. government information and services? Visit