GRB 190415, GRB 190415A, GRB 190415.17
GCN Circular 24138
Subject
Konus-Wind observation of GRB 190415A
Date
2019-04-21T18:33:57Z (7 years ago)
From
Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>
D. Frederiks, S. Golenetskii, R.Aptekar, A. Kozlova,
A.Lysenko, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline,
on behalf of the Konus-Wind team, report:
The long GRB 190415A (Insight-HXMT/HE detection: Luo et al.,
GCN 24125; IPN triangulation: Svinkin et al., GCN 24128)
triggered Konus-Wind (KW) at T0=14986.024 s UT (04:09:46.024).
The light curve of the burst shows a bright, hard-spectrum,
multi-peaked pulse, which started at ~T0 s and had a duration of ~ 19s.
This pulse was followed by a weaker and softer emission tail
of the emission detectable until ~T0+57 s.
The emission is seen up to ~2 MeV.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB190415_T14986/
As observed by Konus-Wind, the burst had
a fluence of (8.8 �� 0.8)x10^-5 erg/cm2 and
a 64-ms peak energy flux, measured from T0+5.824,
of (2.33 �� 0.14)x10^-5 erg/cm2 (both in the 20 keV - 10 MeV
energy range).
The time-integrated spectrum (measured from T0 to T0+56.512 s)
is best fit in the 20 keV - 15 MeV range by a cutoff power-law
(CPL) function with the following model parameters:
the photon index alpha = -0.65(-0.10,+0.11),
and the peak energy Ep = 892(-99,+120) keV,
chi2 = 94/98 dof.
Fitting this spectrum with the GRB (Band) function yields
the same alpha and Ep, and an upper limit on beta (-3.1).
The spectrum near the peak count rate (measured from T0 to T0+7.360)
is best fit in the 20 keV - 15 MeV range by
the CPL function with the following model parameters:
the photon index alpha = -0.17(-0.09,+0.10),
and the peak energy Ep = 994(-62,+67) keV,
chi2 = 89/98 dof.
Fitting this spectrum with the GRB (Band) function yields
the same alpha and Ep, and an upper limit on beta (-3.8).
All the quoted errors are estimated at the 90% confidence level.
All the presented results are preliminary.
GCN Circular 24128
Subject
IPN Triangulation of GRB 190415A
Date
2019-04-18T16:25:31Z (7 years ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
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,
A. Goldstein, M. S. Briggs, and C. Wilson-Hodge
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,
and
S. Barthelmy, J. Cummings, H. Krimm, and D. Palmer,
on behalf of the Swift-BAT team, report:
The long-duration GRB 190415A
(Insight-HXMT/HE detection: Luo et al., GCN Circ. 24125)
was detected by Fermi (GBM trigger 576994194),
INTEGRAL (SPI-ACS), Konus-Wind, Swift (BAT), and Insight (HXMT/HE)
at about 14990 s UT (04:09:50).
The burst was outside the coded field of view of the BAT.
We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
---------------------------------------------
RA(2000), deg Dec(2000), deg
---------------------------------------------
Center:
28.053 (01h 52m 13s) +20.221 (+20d 13' 16")
Corners:
26.606 (01h 46m 25s) +21.774 (+21d 46' 27")
27.221 (01h 48m 53s) +22.093 (+22d 05' 34")
29.374 (01h 57m 30s) +18.606 (+18d 36' 22")
28.770 (01h 55m 05s) +18.296 (+18d 17' 44")
---------------------------------------------
The error box area is about 2.6 sq. deg, and its maximum
dimension is 4.1 deg (the minimum one is 39 arcmin).
The Sun distance was about 10 deg.
This box may be improved.
The box lies outside the 1 sigma of the alternative
localization of the Fermi-GBM detection BALROG
(Kunzweiler et al., GCN Circ. 24123; ~0.6 deg stat. + 1 deg sys.),
while being consistent with 1 sigma contours of the Fermi-GBM final
position.
A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB190415_T14986/IPN
The Konus-Wind time history and spectrum will be given in a forthcoming
GCN Circular.
GCN Circular 24125
Subject
GRB 190415A: Insight-HXMT/HE detection
Date
2019-04-16T03:18:40Z (7 years ago)
From
Qi Luo at IHEP <luoqi@ihep.ac.cn>
Q. Luo, C. Cai, S. Xiao, Q. B. Yi, C. K. Li,
X. B. Li, G. Li, J. Y. Liao, S. L. Xiong,
C. Z. Liu, X. F. Li, Z. W. Li, Z. Chang, X. F. Lu,
A. M. Zhang, Y. F. Zhang, C. L. Zou (IHEP), Y. J. Jin,
Z. Zhang (THU), T. P. Li (IHEP/THU), F. J. Lu, L. M. Song,
M. Wu, Y. P. Xu, S. N. Zhang (IHEP),
report on behalf of the Insight-HXMT team:
At 2019-04-15T04:09:49.900 (T0), the Insight-HXMT/HE detected
GRB 190415A(trigger ID: HEB190415173) in a routine search of the data,
which was also triggered by Fermi/GBM(F. Kunzweiler et al. ,GCN 24123)
and INTEGRAL.
The Insight-HXMT/HE light curve mainly consists of multiple
pulses with a duration (T90) of 24.74 s measured from T0+0.89 s.
The 1-ms peak rate, measured from T0+4.001 s, is 17011 cnts/sec.
The total counts from this burst is 100520 counts.
URL_LC: http://www.hxmt.org/images/GRB/HEB190415173_lc.jpg
All measurements above are made with the CsI detectors operating in the
regular mode with the energy range of about 80-800 keV (record energy).
Only gamma-rays with energy greater than about 200 keV can penetrate
the spacecraft and leave signals in the CsI detectors installed inside
of the telescope.
Insight-HXMT is the first Chinese space X-ray telescope, which was
fundedjointly by the China National Space Administration (CNSA) and
the Chinese Academy of Sciences (CAS).
More information about it could be found at:
http://www.hxmt.org.
GCN Circular 24123
Subject
Fermi Trigger 576994194 / GRB 190415173 / : BALROG localization
Date
2019-04-15T07:31:20Z (7 years ago)
From
Jochen Greiner at MPE,Garching <jcg@mpe.mpg.de>
F. Kunzweiler, B. Biltzinger, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
576994194 at 04:09:49 on 15 April 2019 were automatically fitted for spectrum
and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427;
Berlato et al. 2019, ApJ 873, 60).
The best-fit position (1 sigma statistical errors) is:
RA(2000.0) = 24.9+/-0.7 deg
Decl.(2000.0) = 17.2+/-0.6 deg
We estimate an additional systematic error of 1 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB190415173/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB190415173/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB190415173/json
GCN Circular 24122
Subject
Fermi GRB190415.17 Global MASTER-Net observations report
Date
2019-04-15T07:01:31Z (7 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa,
A.Kuznetsov, V.V.Chazov, D. Vlasenko
Lomonosov Moscow State University,
Sternberg Astronomical Institute, Moscow State University
A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov
Kislovodsk Solar Station of the Pulkovo Observatory
K. Ivanov, O. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, V. Poleshchuk
Irkutsk State University
V. Yurkov, A. Gabovich, Yu. Sergienko
Blagoveschensk Educational State University, Blagoveschensk
R. Podesta, Carlos Lopez and F. Podesta
Observatorio Astronomico Felix Aguilar (OAFA)
Hugo Levato and Carlos Saffe
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres
The Instituto de Astrofisica de Canarias
D. Buckley, S. Potter, A. Kniazev, M. Kotze
South African Astronomical Observatory
MASTER-IAC robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Spain (IAC Teide Observatory) was pointed to the Fermi GRB190415.17 ( 21h 13m 31.99s , +71d 46m 59.88s, R=3.7) 61 sec after trigger time at 2019-04-15 04:10:51 UT, with upper limit up to 17.2 mag. The observations began at zenit distance = 57 deg. The sun altitude is -31.1 deg.
The galactic latitude b = -60 deg., longitude l = 98 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=999257
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|___________________________________|_____|_______|_______|________
67 | 2019-04-15 04:10:51 | MASTER-IAC | ( 21h 12m 18.38s , +71d 47m 07.16s) | P- | 10 | 15.5 |
97 | 2019-04-15 04:10:51 | MASTER-IAC | ( 21h 12m 18.40s , +71d 47m 07.18s) | P- | 70 | 16.6 | Coadd
67 | 2019-04-15 04:10:51 | MASTER-IAC | ( 21h 14m 50.78s , +71d 44m 35.57s) | P| | 10 | 15.6 |
97 | 2019-04-15 04:10:51 | MASTER-IAC | ( 21h 14m 50.79s , +71d 44m 35.58s) | P| | 70 | 16.8 | Coadd
123 | 2019-04-15 04:10:51 | MASTER-IAC | ( 21h 12m 18.90s , +71d 47m 06.96s) | P- | 20 | 16.1 |
123 | 2019-04-15 04:10:51 | MASTER-IAC | ( 21h 14m 51.38s , +71d 44m 35.78s) | P| | 20 | 16.2 |
197 | 2019-04-15 04:10:51 | MASTER-IAC | ( 21h 14m 51.70s , +71d 44m 36.31s) | P| | 40 | 16.2 |
197 | 2019-04-15 04:10:51 | MASTER-IAC | ( 21h 12m 19.26s , +71d 47m 06.90s) | P- | 40 | 16.1 |
285 | 2019-04-15 04:10:51 | MASTER-IAC | ( 21h 12m 19.57s , +71d 47m 06.89s) | P- | 50 | 15.9 |
288 | 2019-04-15 04:10:51 | MASTER-IAC | ( 21h 14m 51.87s , +71d 44m 36.65s) | P| | 50 | 15.9 |
381 | 2019-04-15 04:10:51 | MASTER-IAC | ( 21h 12m 19.70s , +71d 47m 06.81s) | P- | 70 | 16.1 |
381 | 2019-04-15 04:10:51 | MASTER-IAC | ( 21h 14m 51.95s , +71d 44m 36.87s) | P| | 70 | 16.2 |
1090 | 2019-04-15 04:10:51 | MASTER-IAC | ( 20h 50m 47.19s , +69d 59m 58.53s) | C | 60 | 17.2 |
1090 | 2019-04-15 04:10:51 | MASTER-IAC | ( 21h 14m 41.45s , +69d 55m 43.47s) | C | 60 | 17.1 |
1504 | 2019-04-15 04:10:51 | MASTER-IAC | ( 21h 14m 41.16s , +69d 55m 43.01s) | C | 60 | 16.7 |
1504 | 2019-04-15 04:10:51 | MASTER-IAC | ( 20h 50m 46.50s , +70d 0m 00.80s) | C | 60 | 17.2 |
5462 | 2019-04-15 04:10:51 | MASTER-IAC | ( 21h 2m 05.56s , +73d 59m 24.36s) | C | 60 | 14.6 |
5462 | 2019-04-15 04:10:51 | MASTER-IAC | ( 21h 31m 32.07s , +73d 54m 50.58s) | C | 60 | 14.5 |
5565 | 2019-04-15 04:10:51 | MASTER-IAC | ( 22h 1m 11.43s , +69d 55m 11.50s) | C | 60 | 14.6 |
5565 | 2019-04-15 04:10:51 | MASTER-IAC | ( 21h 37m 26.32s , +69d 59m 27.86s) | C | 60 | 15.1 |
5667 | 2019-04-15 04:10:51 | MASTER-IAC | ( 21h 31m 37.37s , +67d 55m 46.96s) | C | 60 | 16.0 |
5805 | 2019-04-15 04:10:51 | MASTER-IAC | ( 21h 9m 55.23s , +67d 59m 40.96s) | C | 60 | 16.2 |
5805 | 2019-04-15 04:10:51 | MASTER-IAC | ( 21h 31m 37.52s , +67d 55m 26.22s) | C | 60 | 15.7 |
5906 | 2019-04-15 04:10:51 | MASTER-IAC | ( 21h 2m 07.12s , +73d 59m 22.27s) | C | 60 | 15.7 |
5906 | 2019-04-15 04:10:51 | MASTER-IAC | ( 21h 31m 34.30s , +73d 54m 45.03s) | C | 60 | 15.6 |
6031 | 2019-04-15 04:10:51 | MASTER-IAC | ( 22h 1m 12.40s , +69d 55m 09.83s) | C | 60 | 14.9 |
6172 | 2019-04-15 04:10:51 | MASTER-IAC | ( 21h 37m 26.38s , +69d 59m 25.91s) | C | 60 | 15.6 |
6172 | 2019-04-15 04:10:51 | MASTER-IAC | ( 22h 1m 11.32s , +69d 55m 09.10s) | C | 60 | 15.5 |
6279 | 2019-04-15 04:10:51 | MASTER-IAC | ( 21h 9m 56.03s , +67d 59m 40.54s) | C | 60 | 15.7 |
6279 | 2019-04-15 04:10:51 | MASTER-IAC | ( 21h 31m 37.61s , +67d 55m 26.25s) | C | 60 | 15.8 |
6385 | 2019-04-15 04:10:51 | MASTER-IAC | ( 20h 4m 13.68s , +74d 0m 30.87s) | C | 60 | 15.4 |
6385 | 2019-04-15 04:10:51 | MASTER-IAC | ( 20h 33m 41.53s , +73d 55m 47.01s) | C | 60 | 15.4 |
6489 | 2019-04-15 04:10:51 | MASTER-IAC | ( 20h 27m 19.45s , +68d 0m 51.65s) | C | 60 | 15.9 |
6489 | 2019-04-15 04:10:51 | MASTER-IAC | ( 20h 49m 01.81s , +67d 56m 32.15s) | C | 60 | 16.0 |
6597 | 2019-04-15 04:10:51 | MASTER-IAC | ( 20h 27m 51.21s , +69d 56m 46.05s) | C | 60 | 15.9 |
6711 | 2019-04-15 04:10:51 | MASTER-IAC | ( 20h 4m 12.05s , +74d 0m 31.90s) | C | 60 | 14.7 |
6852 | 2019-04-15 04:10:51 | MASTER-IAC | ( 20h 27m 19.35s , +68d 0m 31.75s) | C | 60 | 14.1 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.