GRB 190129A
GCN Circular 23815
Subject
GRB 190129A: CALET Gamma-Ray Burst Monitor detection
Date
2019-01-30T12:12:35Z (7 years ago)
From
Valentin Pal'shin at AGU <val@phys.aoyama.ac.jp>
H. Onozawa, A. Yoshida, T. Sakamoto, V. Pal'shin, S. Sugita (AGU),
Y. Kawakubo (LSU), A. Tezuka, S. Matsukawa, T. Ito, H. Morita, Y. Sone
(AGU),
K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), I. Takahashi (IPMU),
Y. Asaoka, S. Ozawa, S. Torii (Waseda U),
Y. Shimizu, T. Tamura (Kanagawa U),
W. Ishizaki (ICRR), M. L. Cherry (LSU),
S. Ricciarini (U of Florence),
A. V. Penacchioni, P. S. Marrocchesi (U of Siena),
and the CALET collaboration:
The long GRB 190129A (MAXI/GSC detection: Nakahira et al., GCN Circ. 23806;
Fermi GBM detection: Bissaldi, Mailyan & Meegan, GCN Circ. 23810)
triggered the CALET Gamma-ray Burst Monitor (CGBM) at 12:55:43.519 UTC
on 29 January 2019. The burst signal was seen by the HXM2 and SGM
detectors.
The burst light curve shows a weak pulse which starts at T-2.2 sec and
ends at T+4.8 sec. The T90 and T50 durations measured by the SGM data
are 6.0 +- 2.2 sec and 3.0 +- 2.2 sec (40-1000 keV), respectively.
The ground processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1232801614/
The CALET data used in this analysis are provided by
the Waseda CALET Operation Center located at the Waseda University.
GCN Circular 23810
Subject
GRB 190129A: Fermi GBM detection
Date
2019-01-29T21:36:58Z (7 years ago)
From
Bagrat Mailyan at UAH <bm0054@uah.edu>
E. Bissaldi (Politecnico & INFN Bari), B. Mailyan (UAH) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 12:21:41.87 UT on 29 January 2019, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 190129A (trigger 570457306 / 190129515),
which was also detected by MAXI/GSC (Nakahira et al. 2019, GCN 23806).
The GBM on-ground location is consistent with the MAXI/GSC position.
The angle from the Fermi LAT boresight at the GBM trigger time is 118
degrees.
The GBM light curve shows/consists of a single peak
with a duration (T90) of about 8.7 s (50-300 keV).
The time-averaged spectrum from T0-1 s to T0+4 s is
adequately fit by
a power law function with an exponential
high-energy cutoff. The power law index is -1.37 +/- 0.23 and
the cutoff energy, parameterized as Epeak, is 78 +/- 19 keV.
The event fluence (10-1000 keV) in this time interval is
(9 +/- 1)E-07 erg/cm^2. The 1-sec peak photon flux measured
starting from T0-0.38 s in the 10-1000 keV band
is 3.7 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
GCN Circular 23806
Subject
GRB 190129A: MAXI/GSC detection
Date
2019-01-29T13:21:11Z (7 years ago)
From
Satoshi Sugita at Aoyama Gakuin U. <sugita@phys.aoyama.ac.jp>
S. Nakahira (RIKEN), S. Sugita (AGU),
H. Negoro, M. Nakajima, A. Sakamaki, W. Maruyama, M. Aoki, K.
Kobayashi (Nihon U.),
T. Mihara, F. Yatabe, Y. Takao, M. Matsuoka (RIKEN),
T. Sakamoto, M. Serino, Y. Kawakubo, T. Hashimoto, A. Yoshida (AGU),
N. Kawai, M. Sugizaki, Y. Tachibana, K. Morita (Tokyo Tech),
S. Ueno, H. Tomida, M. Ishikawa, Y. Sugawara, N. Isobe, R. Shimomukai,
T. Midooka (JAXA),
Y. Ueda, A. Tanimoto, T. Morita, S. Yamada, S. Ogawa (Kyoto U.),
Y. Tsuboi, W. Iwakiri, R. Sasaki, H. Kawai, T. Sato (Chuo U.),
H. Tsunemi, T. Yoneyama, K. Asakura, S. Ide (Osaka U.),
M. Yamauchi, K. Hidaka, S. Iwahori (Miyazaki U.),
T. Kawamuro (NAOJ),
K. Yamaoka (Nagoya U.),
M. Shidatsu (Ehime U.),
Y. Kawakubo (LSU)
report on behalf of the MAXI team:
The MAXI/GSC nova alert system triggered a bright uncatalogued X-ray
transient source at 12:21:40 UT on January 29, 2019.
Assuming that the source flux was constant over the transit,
we obtain the source position at
(R.A., Dec) = (11.459 deg, -31.887 deg) = (00 45 50, -31 53 13) (J2000)
with a statistical 90% C.L. elliptical error region
with long and short radii of 0.16 deg and 0.15 deg, respectively.
The roll angle of long axis from the north direction is 40.0 deg
counterclockwise.
There is an additional systematic uncertainty of 0.1 deg (90%
containment radius).
The X-ray flux averaged over the scan was 306 +- 37 mCrab
(4.0-10.0keV, 1 sigma error).
Without assumptions on the source constancy,we obtain a rectangular error
box for the transient source with the following corners:
(R.A., Dec) = (10.934, -32.736) deg = (00 43 44, -32 44 09) (J2000)
(R.A., Dec) = (11.230, -32.814) deg = (00 44 55, -32 48 50) (J2000)
(R.A., Dec) = (11.935, -30.870) deg = (00 47 44, -30 52 12) (J2000)
(R.A., Dec) = (11.645, -30.793) deg = (00 46 34, -30 47 34) (J2000)
There was no significant excess flux in the previous transit at UT 10:49
with an upper limit of 20 mCrab.