GRB 200120A
GCN Circular 27025
Subject
GRB 200120A: Fermi GBM observation
Date
2020-02-09T02:01:37Z (6 years ago)
From
Rachel Hamburg at UAH <rkh0007@uah.edu>
R. Hamburg (UAH) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 23:04:55.34 UT on 20 January 2020, the Fermi Gamma-Ray Burst Monitor
(GBM)
triggered and located GRB 200120A (trigger 601254300 / 200120962).
GRB 200120A was also detected by Insight/HMXT (GCN 26840) and AstroSat/CZTI
(GCN 26851), and localized by the IPN (GCN 26856).
Approximately 820 s after the GBM trigger, SRG/eRosita detected and
localized
an X-ray transient consistent with being the afterglow of GRB 200120A
(Weber et al. 2019, GCN 26988). The Fermi GBM Final Real-time
Localization (GCN 26831) is consistent with the SRG/eRosita position.
The angle from the Fermi LAT boresight at the GBM trigger time is 148
degrees.
The GBM light curve shows a broad, single-peaked structure
with a duration (T90) of about 13 s (50-300 keV).
The time-averaged spectrum from T0-6. to T0+10. s is
best fit by a power law function with an exponential
high-energy cutoff. The power law index is -0.92 +/- 0.10 and
the cutoff energy, parameterized as Epeak, is 239 +/- 22 keV.
The event fluence (10-1000 keV) in this time interval is
(9.4 +/- 0.4)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+3.0 s in the 10-1000 keV band
is 13 +/- 1 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 26988
Subject
GRB200120A: SRG/eROSITA discovery of X-ray afterglow
Date
2020-02-05T15:50:25Z (6 years ago)
From
Arne Rau at MPE <arau@mpe.mpg.de>
P. Weber (FAU), A. Rau (MPE), Th. Dauser (FAU), I. Kreykenbohm (FAU), J.
Wilms (FAU) report:
The location of the Fermi/GBM long duration GRB 200120A (#26831, #26840,
#26851, #26856, #26857, #26974) was observed by SRG/eROSITA as part of
its all-sky survey between UTC 2020 Jan 16th and Jan 24th.�� Throughout
this period, the instrument scanned over the position with a cadence of 4hr.
On UTC Jan 20th 23:18:15 (820 seconds after the Fermi/GBM trigger) we
detected a bright and quickly fading X-ray source localized to
RA(J2000) =���� 09:08:32.1 (137.13364 deg)
Dec(J2000) = -70:25:11���� (-70.43628 deg)
with an uncertainty of ~4" arcsec radius. This position is consistent
with the Fermi/GBM (#26831) and IPN (#26856) localizations, suggesting
the source to be the X-ray afterglow of GRB200120A.
At the time of discovery, the source was detected with a count rate of
44+/-2 cnt/s in the 0.2-10keV band, corresponding to a flux of approx.
1x10E-10 erg/cm^2/s. The source was also found during the next scan 4hr
later. By then, it had faded to 2.8+/-0.5 cnt/s (approx. 6x10E-12
erg/cm^2/s). Further detections were obtained in the following three
scans with count rates of ~1+/-0.3 cnt/s. Nothing was seen in the scans
prior to the Fermi/GBM detection.
GCN Circular 26974
Subject
GRB200120A: SRG/ART-XC Upper Limit
Date
2020-02-03T16:06:32Z (6 years ago)
From
Sergey Molkov at Space Research Inst., Moscow <molkov@iki.rssi.ru>
S.Molkov, A.Lutovinov, M.Pavlinsky, I.Lapshov,
A.Tkachenko and A.Semena (IKI RAN)
report on behalf of SRG/ART-XC team:
The SRG/ART-XC telescope crossed the GBM localization region of
GRB200120A (GCN26831) and its IPN triangulation (GCN26856)
several times after the event. The first pass was approximately
800 seconds after the event time and covered the sky region between
lines defined by two pairs of the RA, DEC (J2000) coordinates:
1st (142.420, -69.397) , (130.997, -70.584);
2nd (147.762, -69.996) , (130.734, -71.192).
This region has approximately 60% cross section area with the IPN
triangulation. We do not detect with ART-XC any source around
the GRB200120A position with the upper limit, averaged over FoV,
of ~2e-11 ergs/s/cm2 in the 4-12 keV energy band neither in this
pass nor in subsequent ones ��followed every 4 hours during next
few days.
The history of observations is available at
http://hea.iki.rssi.ru/molkov/GRB200120A/
GCN Circular 26857
Subject
Konus-Wind observation of GRB 200120A
Date
2020-01-22T18:18:59Z (6 years ago)
From
Dmitry Frederiks at Ioffe Institute <fred@mail.ioffe.ru>
D. Frederiks, S. Golenetskii, R. Aptekar, A. Lysenko,
A. Ridnaia, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline
on behalf of the Konus-Wind team, report:
The long GRB 200120A (Fermi GBM localization: GCN 26831;
IPN triangulation: Hurley et al., GCN 26856;
Insight-HXMT/HE detection: Zheng et al., GCN 26840)
triggered Konus-Wind at T0=83096.553 s UT (23:04:56.553).
The burst light curve shows a mult-peaked pulse
which starts at ~T0-5 s and has a total duration of ~12 s.
The emission is seen up to ~2 MeV.
As observed by Konus-Wind, the burst
had a fluence of 8.2(-0.7,+0.8)x10^-6 erg/cm2,
and a 64-ms peak flux, measured from T0+3.368 s,
of 4.0(-0.5,+0.4)x10^-6 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum of the burst
(measured from T0 to T0+8.448 s)
is best fit in the 20 keV - 15 MeV range
by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
with alpha = -1.12(-0.15,+0.17)
and Ep = 221(-32,+47) keV (chi2 = 105/98 dof).
Fitting by a GRB (Band) model yields the same alpha and Ep,
and an upper limit on the high energy photon index: beta < -2.3
(chi2 =105/97 dof).
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB200120_T83096/
All the quoted errors are at the 90% confidence level.
All the quoted values are preliminary.
GCN Circular 26856
Subject
IPN Triangulation of GRB 200120A
Date
2020-01-22T18:11:06Z (6 years ago)
From
Anna Ridnaia at Ioffe Institute <ridnaia@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,
A. Ridnaia, S. Golenetskii, R. Aptekar, D. Frederiks, D. Svinkin,
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 200120A (The Fermi GBM team, GCN Circ. 26831;
Insight-HXMT/HE detection: Zheng et al., GCN Circ. 26840;
AstroSat CZTI detection: Gaikwad et al., GCN Circ. 26851)
was detected by Konus-Wind, Fermi (GBM trigger 601254300),
INTEGRAL (SPI-ACS), Mars-Odyssey (HEND), Insight (HXMT/HE),
AstroSat (CZTI), and Swift (BAT) at about 83095 s UT (23:04:55).
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:
137.180 (09h 08m 43s) -70.389 (-70d 23' 22")
Corners:
136.684 (09h 06m 44s) -70.872 (-70d 52' 19")
136.099 (09h 04m 24s) -70.854 (-70d 51' 15")
137.657 (09h 10m 38s) -69.906 (-69d 54' 21")
138.218 (09h 12m 52s) -69.919 (-69d 55' 08")
---------------------------------------------
The error box area is 686 sq. arcmin, and its maximum
dimension is 1.2 deg (the minimum one is 10.6 arcmin).
The Sun distance was 88 deg.
This box may be improved.
The IPN localization is consistent with, but reduces
the area of, the Fermi-GBM (GCN Circ. 26831) and
BALROG (https://grb.mpe.mpg.de/grb/GRB200120962) one.
This event is spatially and temporally inconsistent
with the IceCube 200120A neutrino candidate event (GCN Circ. 26832).
A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB200120_T83096/IPN/
The Konus-Wind time history and spectrum will be given in a forthcoming
GCN Circular.
GCN Circular 26851
Subject
GRB 200120A: AstroSat CZTI detection
Date
2020-01-22T12:06:37Z (6 years ago)
From
Ramkrishna Gaikwad at IUCAA/AstroSat <ramkrishna@iucaa.in>
R. Gaikwad, S. Gupta, V. Sharma and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data showed a weak detection of a long GRB 200120A, which was also detected by Fermi GBM Final Real-time Localization (GCN #26831) and IceCube (Lagunas C. et al., GCN #26832).
The source was clearly detected in the 40-200 keV energy range. The light curve showed a single peak of emission peaking at 2020-01-20 23:04:55.0 UT. The measured peak count rate associated with the burst is 156 cts/s above the background in the combined data of four quadrants, with a total of 805 cts. The local mean background count rate was 678 cts/s. Using cumulative rates, we measure a T90 of 9.8 s.
It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range.
CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated the project.
GCN Circular 26840
Subject
GRB 200120A: Insight-HXMT/HE detection
Date
2020-01-21T16:05:04Z (6 years ago)
From
YaoGuang Zheng at IHEP <zhengyg@ihep.ac.cn>
Y. G. Zheng, C. Cai, Y. F. Du, W. C. Xue,
Q. Luo, S. Xiao, Q. B. Yi, Y. Huang, C. K. Li, G. Li,
X. B. Li, J. Y. Liao, S. L. Xiong,C. Z. Liu,
X. F. Li, Z. W. Li, Z. Chang, A. M. Zhang, Y. F. Zhang,
X. F. Lu, 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 2020-01-20T23:04:58.60 (T0), Insight-HXMT/HE detected
GRB 200120A (trigger ID: HEB200120961) in a routine search of the data,
which also triggered Fermi/GBM (GCN #26831).
The Insight-HXMT/HE light curve mainly consists of a single
pulse with a duration (T90) of 5.66 s measured from T0-2.86 s.
The 1-ms peak rate, measured from T0-0.08 s, is 890 cnts/sec.
The total counts from this burst is 2641 counts.
URL_LC: http://www.hxmt.org/images/GRB/HEB200120961_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 (deposited 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
funded jointly 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 26831
Subject
GRB 200120A: Fermi GBM Final Real-time Localization
Date
2020-01-20T23:15:17Z (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 23:04:55 UT on 20 Jan 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200120A (trigger 601254300.33796 / 200120962).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 139.4, Dec = -70.7 (J2000 degrees, equivalent to J2000 09h 17m, -70d 42'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 148.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200120962/quicklook/glg_skymap_all_bn200120962.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/bn200120962/quicklook/glg_healpix_all_bn200120962.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200120962/quicklook/glg_lc_medres34_bn200120962.gif