GRB 200130B
GCN Circular 26944
Subject
GRB 200130B: Fermi GBM Final Real-time Localization
Date
2020-01-30T10:10:17Z (5 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 09:59:56 UT on 30 Jan 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200130B (trigger 602071201.67246 / 200130417).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 137.5, Dec = -51.3 (J2000 degrees, equivalent to J2000 09h 09m, -51d 17'), with a statistical uncertainty of 3.5 degrees.
The angle from the Fermi LAT boresight is 34.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200130417/quicklook/glg_skymap_all_bn200130417.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/bn200130417/quicklook/glg_healpix_all_bn200130417.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200130417/quicklook/glg_lc_medres34_bn200130417.gif
GCN Circular 26945
Subject
GRB 200130B: BALROG localization (Fermi Trigger 602071201 / GRB 200130417)
Date
2020-01-30T10:35:00Z (5 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
602071201 at 09:59:56 on 30 Jan. 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) = 138.5+/-1.4 deg
Decl.(2000.0) = -56.9+/-0.9 deg
We estimate an additional systematic error of 2 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB200130417/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB200130417/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB200130417/json
GCN Circular 26949
Subject
IPN triangulation of GRB 200130B
Date
2020-01-31T12:15:53Z (5 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,
S. Barthelmy, J. Cummings, H. Krimm, and D. Palmer,
on behalf of the Swift-BAT 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 200130B
(Fermi-GBM detection: The Fermi GBM team, GCN Circ. 26944;
BALROG localization: Kunzweiler et al., GCN Circ. 26945)
was detected by Fermi (GBM trigger 602071201), Konus-Wind,
INTEGRAL (SPI-ACS), Mars-Odyssey (HEND), and Swift (BAT),
at about 35997 s UT (09:59:57).
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:
134.742 (08h 58m 58s) -49.627 (-49d 37' 38")
Corners:
133.618 (08h 54m 28s) -50.349 (-50d 20' 55")
134.000 (08h 56m 00s) -50.392 (-50d 23' 31")
135.836 (09h 03m 21s) -48.893 (-48d 53' 34")
135.462 (09h 01m 51s) -48.857 (-48d 51' 26")
---------------------------------------------
The error box area is 1487 sq. arcmin, and its maximum
dimension is 2.0 deg (the minimum one is 13 arcmin).
The Sun distance was 112 deg.
This box may be improved.
The IPN localization is consistent with, but reduces the area of, the
Fermi-GBM final position (GCN Circ. 26944).
A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB200130_T35999/IPN
The Konus-Wind time history and spectrum will be given in a forthcoming
GCN Circular.
GCN Circular 26950
Subject
Konus-Wind observation of GRB 200130B
Date
2020-01-31T16:08:04Z (5 years ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks,
M. Ulanov, A. Tsvetkova, A. Lysenko, A. Ridnaia, and T. Cline
on behalf of the Konus-Wind team, report:
The long-duration GRB 200130B
(Fermi-GBM detection: The Fermi GBM team, GCN Circ. 26944;
BALROG localization: Kunzweiler et al., GCN Circ. 26945;
IPN triangulation: Hurley et al., GCN Circ. 26949)
triggered Konus-Wind at T0=35999.282 s UT (09:59:59.282).
The burst light curve shows an initial intense pulse
which starts at ~T0-0.3 s followed by a weaker emission up to ~12 s.
The emission is seen up to ~1 MeV.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB200130_T35999/
As observed by Konus-Wind, the burst
had a fluence of 1.10(-0.09,+0.11)x10^-5 erg/cm2,
and a 64-ms peak flux, measured from T0+0.284 s,
of 6.59(-1.21,+1.34)x10^-6 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the burst
(measured from T0 to T0+16.640 s)
is best fit in the 20 keV - 1 MeV range
by the GRB (Band) model with the following parameters:
the low-energy photon index alpha = -0.88(-0.19,+0.24),
the high energy photon index beta = -3.58(-6.42,+0.64),
the peak energy Ep = 90(-6,+6) keV
(chi2 = 55/44 dof).
The spectrum near the maximum count rate
(measured from T0+0.256 to T0+8.448 s)
is best fit in the 20 keV - 1 MeV range
by the GRB (Band) model with the following parameters:
the low-energy photon index alpha = -0.85(-0.20,+0.26),
the high energy photon index beta = -4.01(-5.99,+0.98),
the peak energy Ep = 91(-6,+6) keV
(chi2 = 44/44 dof).
All the quoted errors are at the 90% confidence level.
All the quoted values are preliminary.