GRB 200313A
GCN Circular 27399
Subject
Konus-Wind observation of GRB 200313A
Date
2020-03-17T13:49:15Z (6 years ago)
From
Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>
A. Ridnaia, S. Golenetskii, R. Aptekar, D. Frederiks,
M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline
on behalf of the Konus-Wind team, report:
The long-duration GRB 200313A
(Fermi-GBM detection: The Fermi GBM team, GCN Circ. 27374;
Lesage and C. Meegan, GCN Circ. 27383;
BALROG localization: Biltzinger et al., GCN Circ. 27377;
IPN triangulation: Hurley et al., GCN Circ. 27385)
triggered Konus-Wind at T0=6098.088 s UT (01:41:38.088).
The burst light curve shows a multipeaked structure
which starts at ~T0-0.4 s and has a total duration of ~43 s.
The emission is seen up to ~6 MeV.
As observed by Konus-Wind, the burst
had a fluence of 1.46(-0.14,+0.15)x10^-4 erg/cm2,
and a 64-ms peak flux, measured from T0+2.528 s,
of 3.42(-0.52,+0.53)x10^-5 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the burst
(measured from T0 to T0+45.824 s)
is best fit in the 20 keV - 6 MeV range
by the GRB (Band) model with the following parameters:
the low-energy photon index alpha = -0.88(-0.10,+0.12),
the high energy photon index beta = -2.07(-0.17,+0.12),
the peak energy Ep = 442(-66,+77) keV
(chi2 = 70/75 dof).
The spectrum near the maximum count rate
(measured from T0+2.048 to T0+3.072 s)
is best fit in the 20 keV - 6 MeV range
by the GRB (Band) model with the following parameters:
the low-energy photon index alpha = -0.69(-0.13,+0.17),
the high energy photon index beta = -2.24(-0.21,+0.16),
the peak energy Ep = 424(-69,+70) keV
(chi2 = 61/58 dof).
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB200313_T06098/
All the quoted errors are at the 90% confidence level.
All the quoted values are preliminary.
GCN Circular 27385
Subject
IPN triangulation of GRB 200313A
Date
2020-03-15T16:56:10Z (6 years ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
K. Hurley, on behalf of the IPN,
I. G. Mitrofanov, D. V. Golovin, A. S. Kozyrev, M. L. Litvak,
and A. B. Sanin, on behalf of the HEND-Odyssey GRB team,
D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Ridnaia,
and T. Cline on behalf of the Konus-Wind team,
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
W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr,
on behalf of the GRS-Odyssey GRB team, report:
The long-duration GRB 200313A
(Fermi-GBM detection: The Fermi GBM team, GCN Circ. 27374;
Lesage and C. Meegan, GCN Circ. 27383;
BALROG localization: Biltzinger et al., GCN Circ. 27377)
has been detected by Fermi (GBM trigger 605756501), Konus-Wind,
INTEGRAL (SPI-ACS), and Mars-Odyssey (HEND), so far,
at about 6097 s UT (01:41:37).
We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
---------------------------------------------
RA(2000), deg Dec(2000), deg
---------------------------------------------
Center:
73.028 (04h 52m 06s) +24.623 (+24d 37' 24")
Corners:
73.480 (04h 53m 55s) +29.123 (+29d 07' 21")
73.078 (04h 52m 19s) +35.837 (+35d 50' 13")
72.077 (04h 48m 18s) +29.401 (+29d 24' 04")
72.972 (04h 51m 53s) +19.772 (+19d 46' 18")
74.907 (04h 59m 38s) +13.551 (+13d 33' 02")
74.212 (04h 56m 51s) +20.241 (+20d 14' 26")
---------------------------------------------
The error box area is 18.9 sq. deg, and its maximum
dimension is 22 deg (the minimum one is 1.2 deg).
The Sun distance was 81 deg.
This box may be improved.
The localization is consistent with, but reduces
the area of, the final Fermi-GBM (GCN Circ. 27374) and
BALROG (GCN Circ. 27377) localizations.
A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB200313_T06098/IPN/
The Konus-Wind time history and spectrum will be given in a forthcoming
GCN Circular.
GCN Circular 27383
Subject
GRB 200313A: Fermi GBM detection
Date
2020-03-13T19:20:45Z (6 years ago)
From
Stephen Lesage at Fermi-GBM Team <sjl0014@uah.edu>
S. Lesage (UAH) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 01:41:36.62 UT on 13 March 2020, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 200313A (trigger 605756501 / 200313071).
The location for this GRB was reported in the Fermi GBM Final Real-time
Localization GCN (GCN 27374).
The GBM light curve shows a single broad peak
with a duration (T90) of about 13.6 s (50-300 keV).
The time-averaged spectrum from T0 s to T0+22.5 s is
best fit by a Band function with Epeak = 279 +/- 10 keV,
alpha = -0.64 +/- 0.02, and beta = -1.84 +/- 0.02.
The event fluence (10-1000 keV) in this time interval is
(7.37 +/- 0.05)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+2.4 s in the 10-1000 keV band
is 57.0 +/- 0.7 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog:
https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
For Fermi GBM data and info, please visit the official Fermi GBM Support
Page:
https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
GCN Circular 27377
Subject
GRB 200313A: BALROG localization (Fermi Trigger 605756501 / GRB 200313071)
Date
2020-03-13T02:46:49Z (6 years ago)
From
Jochen Greiner at MPE,Garching <jcg@mpe.mpg.de>
B. Biltzinger, F. Kunzweiler, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
605756501 at 01:41:36 on 13 March 2020 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) = 76.4+/-0.4 deg
Decl.(2000.0) = 21.7+/-0.3 deg
We estimate an additional systematic error of 2 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB200313071/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB200313071/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB200313071/json
GCN Circular 27374
Subject
GRB 200313A: Fermi GBM Final Real-time Localization
Date
2020-03-13T01:51:55Z (6 years ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
The Fermi GBM team reports the detection of a likely LONG GRB
At 01:41:36 UT on 13 Mar 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200313A (trigger 605756501.620896 / 200313071).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 75.8, Dec = 20.9 (J2000 degrees, equivalent to J2000 05h 03m, 20d 53'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 103.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200313071/quicklook/glg_skymap_all_bn200313071.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200313071/quicklook/glg_healpix_all_bn200313071.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200313071/quicklook/glg_lc_medres34_bn200313071.gif