GRB 201109A
GCN Circular 28868
Subject
GRB 201109A: Fermi GBM Final Real-time Localization
Date
2020-11-09T02:41:28Z (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 SHORT GRB
At 02:31:05 UT on 9 Nov 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 201109A (trigger 626581870.79309 / 201109105).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 136.1, Dec = -5.1 (J2000 degrees, equivalent to J2000 09h 04m, -5d 05'), with a statistical uncertainty of 3.3 degrees.
The angle from the Fermi LAT boresight is 66.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201109105/quicklook/glg_skymap_all_bn201109105.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/bn201109105/quicklook/glg_healpix_all_bn201109105.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201109105/quicklook/glg_lc_medres34_bn201109105.gif
GCN Circular 28869
Subject
Fermi GRB 201109A: Global MASTER-Net observations report
Date
2020-11-09T03:00:09Z (5 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin,
V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva,
D.Kuvshinov, D. Cheryasov
(Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile
(Observatorio Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra
(The Instituto de Astrofisica de Canarias),
D. Buckley
(South African Astronomical Observatory),
O.A. Gres, N.M. Budnev, O.Ershova
(Irkutsk State University, API),
A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich, Yu. Sergienko
(Blagoveschensk Educational State University)
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) started inspect of the Fermi GRB 201109A ( Fermi GBM team, GCN 28868) errorbox 533 sec after notice time and 585 sec after trigger time at 2020-11-09 02:40:50 UT, with upper limit up to 18.2 mag. The observations began at zenith distance = 69 deg. The sun altitude is -61.5 deg.
The galactic latitude b = 27 deg., longitude l = 235 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=1478104
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
645 | 2020-11-09 02:40:50 | MASTER-IAC | (09h 03m 30.97s , -05d 02m 21.6s) | C | 120 | 17.3 |
805 | 2020-11-09 02:40:50 | MASTER-IAC | (09h 03m 30.96s , -05d 02m 21.6s) | C | 440 | 18.2 | Coadd
795 | 2020-11-09 02:43:10 | MASTER-IAC | (09h 03m 28.96s , -05d 01m 05.9s) | C | 140 | 17.6 |
974 | 2020-11-09 02:45:50 | MASTER-IAC | (09h 03m 29.14s , -05d 02m 40.8s) | C | 180 | 17.9 |
1174 | 2020-11-09 02:49:09 | MASTER-IAC | (09h 03m 33.03s , -05d 00m 53.6s) | C | 180 | 17.9 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 28874
Subject
GRB 201109A: Fermi GBM detection
Date
2020-11-09T20:47:49Z (5 years ago)
From
Christian Malacaria at NASA-MSFC/USRA <cmalacaria@usra.edu>
C. Malacaria (NASA-MSFC/USRA) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 02:31:05.79 UT on 9 November 2020, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 201109A (trigger 626581870 / 201109105).
The Fermi GBM Final Real-time Localization was reported in GCN 28868.
The angle from the Fermi LAT boresight at the GBM trigger time is 66 degrees.
The GBM light curve consists of a bright peak
with a duration (T90) of about 0.45 s (50-300 keV).
The time-averaged spectrum from T0-0.128 s to T0+0.384 s is
best fit by a power law function with an exponential
high-energy cutoff. The power law index is -0.61 +/- 0.11 and
the cutoff energy, parameterized as Epeak, is 318 +/- 41 keV.
The event fluence (10-1000 keV) in this time interval is
(9.55 +/- 0.72)E-07 erg/cm^2. The 64-msec peak photon flux measured
starting from T0+64 ms in the 10-1000 keV band
is 18.4 +/- 1.2 ph/s/cm^2.
A Band function fits the spectrum equally well
with Epeak= 304 +/- 56 keV, alpha = -0.59 +/- 0.14 and beta = -2.93 +/- 1.42 .
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 28877
Subject
IPN triangulation of GRB 201109A (short)
Date
2020-11-10T23:38:09Z (5 years ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Ridnaia,
and T. Cline on behalf of the Konus-Wind team,
K. Hurley, on behalf of the IPN,
A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo,
and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,
and
A. Goldstein, M. S. Briggs, and C. Wilson-Hodge
on behalf of the Fermi GBM team, report:
The short-duration GRB 201109A
(Fermi-GBM detection: The Fermi GBM team, GCN Circ. 28868;
Malacaria et al., GCN Circ. 28874)
was detected by Fermi (GBM trigger 626581870),
INTEGRAL (SPI-ACS), and Konus-Wind
at about 9066 s UT (02:31:06).
We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
---------------------------------------------
RA(2000), deg Dec(2000), deg
---------------------------------------------
Center:
138.382 (09h 13m 32s) -9.192 ( -9d 11' 31")
Corners:
140.147 (09h 20m 35s) -6.874 ( -6d 52' 27")
139.193 (09h 16m 46s) -6.204 ( -6d 12' 13")
136.612 (09h 06m 27s) -11.514 (-11d 30' 52")
137.577 (09h 10m 19s) -12.196 (-12d 11' 46")
---------------------------------------------
The error box area is 6.75 sq. deg, and its maximum
dimension is 6.2 deg (the minimum one is 1.15 deg).
The Sun distance was 83 deg.
This box may be improved.
The IPN localization is consistent with, but reduces the area of, the
Fermi-GBM final position (GCN Circ. 28868).
A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB201109_T09065/IPN
The Konus-Wind time history and spectrum will be given in a forthcoming
GCN Circular.
GCN Circular 28881
Subject
Konus-Wind observation of GRB 201109A
Date
2020-11-11T18:00:02Z (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 short-duration GRB 201109A
(Fermi-GBM detection: The Fermi GBM team, GCN Circ. 28868;
Malacaria et al., GCN Circ. 28874;
IPN triangulation: Svinkin et al., GCN Circ. 28877)
triggered Konus-Wind at T0=9065.305 s UT (02:31:05.305).
The burst light curve shows a single pulse
which starts at ~T0-0.2 s and has a total duration of ~0.4 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/GRB201109_T09065/
As observed by Konus-Wind, the burst
had a fluence of 9.79(-1.84,+2.96)x10^-7 erg/cm2,
and a 16-ms peak flux, measured from T0+0.018 s,
of 6.13(-2.75,+3.42)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+0.192 s)
is best fit in the 20 keV - 5 MeV range
by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
with alpha = -0.96(-0.51,+0.65)
and Ep = 244(-73,+249) keV (chi2 = 13/16 dof).
Fitting by a GRB (Band) model yields the same alpha and Ep,
and an upper limit on the high energy photon index: beta < -1.9
(chi2 = 13/15 dof).
All the quoted errors are at the 90% confidence level.
All the quoted values are preliminary.