Gamma-ray Burst 170219A
(All information courtesy of the instrument teams.)
Previous IAU Circulars
Results of Observations
- GCN Circular #20702
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,
V. Connaughton, M. S. Briggs, C. Meegan, V. Pelassa,
and A. Goldstein, 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, report:
The short-duration, hard-spectrum GRB 170219A has been detected by Fermi
(GBM trigger 509155392), Konus-Wind, and INTEGRAL (SPI-ACS), so far, at
about 187 s UT (00:03:07).
We have triangulated it to a preliminary, 3 sigma error box whose
RA(2000), deg Dec(2000), deg
54.843 (03h 39m 22s) +50.072 (+50d 04' 20")
55.105 (03h 40m 25s) +49.403 (+49d 24' 11")
55.314 (03h 41m 15s) +49.435 (+49d 26' 04")
54.571 (03h 38m 17s) +50.741 (+50d 44' 27")
54.356 (03h 37m 25s) +50.708 (+50d 42' 28")
The error box area is 696 sq. arcmin, and its maximum
dimension is 1.41 deg (the minimum one is 8.4 arcmin).
The Sun distance was 94 deg.
This box may be improved.
A triangulation map is posted at
The time history and spectrum will be given in forthcoming GCN Circulars.
- GCN Circular #20703
D. Frederiks, S. Golenetskii, R.Aptekar, P. Oleynik, M. Ulanov,
D. Svinkin, A. Tsvetkova, A.Lysenko, A. Kozlova, and T. Cline,
on behalf of the Konus-Wind team, report:
The short/hard GRB 170219A (IPN triangulation: Svinkin et al.,
GCN 20702) triggered Konus-Wind at T0=3D186.125 s UT (00:03:06.125).
The light curve shows a single, bright pulse with a
duration of ~0.25s. The emission is seen up to ~5 MeV.
As observed by Konus-Wind, the burst had a fluence of
(1.6 =B1 0.6)x10^-6 erg/cm2 and a 16-ms peak energy flux,
measured from T0, of (2.8 =B1 0.9)x10^-5 erg/cm2
(both in the 20 keV - 10 MeV energy range).
The spectrum, measured from T0 to T0+0.064 s,
is best fit in the 20 keV - 15 MeV range
by a power law with exponential cutoff (CPL) model
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
with alpha =3D -1.24 (-0.15,+0.17), Ep =3D 1620 (-660,+1920) keV,
The Konus-Wind light curve of this GRB is available at
All the quoted errors are estimated at the 1 sigma confidence level.
All the presented results are preliminary.
- GCN Circular #20706
O.J. Roberts (USRA/NASA), M. Stanbro and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 00:03:07.12 UT on February 19th 2017, the Fermi
Gamma-Ray Burst Monitor triggered and located
GRB 170219A (trigger 509155392 / 170219002), which
was also detected by Konus-Wind
(Frederiks et al. 2017, GCN 20703) and for which a
triangulated position was reported by IPN
(Svinkin et al. 2017, GCN 20702). The GBM localisation
is within about 2.5-sigma of the triangulated IPN position.
The initial angle from the Fermi-LAT boresight to the GBM
ground-location using the centre of the IPN triangulated
position is 133 degrees.
The GBM light curve shows a bright, short burst a duration
(T90) of about 0.08 s (50-300 keV). The time-averaged spectrum
from T0-0.03 s to T0+0.05 s is best fit by a power law function
with an exponential high-energy cutoff. The power law index is
-0.59 +/- 0.10 and the cutoff energy, parameterized as Epeak
is 1165 +/- 182 keV
A Band function fits the spectrum equally well with
alpha= -0.56 +/- 0.11, beta= -3.25 +/- 1.19 and Epeak
is 1093 +/- 202 keV.
The event fluence (10-1000 keV) in this time interval is
(9.52 +/- 0.49)E-07 erg/cm^2. The 64 ms peak photon flux
measured starting from T0+0 s in the 10-1000 keV band is
29.4 +/- 1.9 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
- GCN Circular #20710
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 short-duration GRB 170219A (Roberts et al., GCN Circ. 20706; Frederiks et al.,
GCN Circ. 20703; INTEGRAL-SPI/ACS trigger #7701) triggered the CALET Gamma-ray
Burst Monitor (CGBM) at 00:03:06.76 on 19 February 2017. The burst signal was seen
by all CGBM instruments. Because of a problem in one of the ground alert processing
script, the GCN notice was not distributed automatically for this event.
The light curve of the SGM shows a single peak. The peak starts and peaks
at T0-0.2 sec and ends at T+0.5 sec. The T90 duration measured by
the SGM data is 0.25 +- 0.18 sec (40-1000 keV).
The light curve is available at
The CALET data used in this analysis are provided by the Waseda
CALET Operation Center located at the Waseda University.
- GCN Circular #20719
Minzi Feng (IHEP), Yi Zhao (IHEP), Yuanhao Wang (IHEP)
report on behalf of the POLAR collaboration:
At 2017-02-19T00:03:07.00 UT (T0), during a routine on-ground
search of data, POLAR detected the GRB 170219A,
which was also detected by the
Fermi/GBM (trigger 509155392/170219002, Circ 20706),
CALET/GBM (Cherry et al. 2017, GCN 20710)
INTEGRAL/SPIACS (trigger 7701), Konus-Wind
(Frederiks et al. 2017, GCN 20703) and for which a triangulated
position was reported by IPN (Svinkin et al. 2017, GCN 20702).
The POLAR light curve consists of a single peak,
with a duration (T90) of 0.15 s measured from T0+0.08 s.
The 10-ms peak rate measured from T0+0.12 s is 16148.3 cnts/s.
The total counts is about 964 cnts.
The above results are not dead time corrected. The above
measurements are in the energy range of about 20-500 keV.
Using the best location from the Fermi/GBM, which is (J2000):
RA: 72.730 [deg]
Dec: +49.980 [deg]
Err: 2.88 [deg]
the incident angle in POLAR coordinate at T0 is:
theta: 59.8 [deg]
phi: -90.2 [deg]
All analysis results presented above are preliminary.
POLAR is a dedicated Gamma-Ray Burst polarimeter (50-500 keV)
on-board the Chinese space laboratory Tiangong-2 launched on
Sep 15,2016. More information about POLAR can be found at
http://polar.ihep.ac.cn/en/ , http://isdc.unige.ch/polar/
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Jochen Greiner, last update: 22-Feb-2017