GRB 210202A
GCN Circular 29380
Subject
GRB 210202A: Fermi GBM Final Real-time Localization
Date
2021-02-02T20:20:52Z (4 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 20:10:31 UT on 2 Feb 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210202A (trigger 633989436.299376 / 210202841).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 232.2, Dec = -40.4 (J2000 degrees, equivalent to J2000 15h 28m, -40d 23'), with a statistical uncertainty of 1.7 degrees.
The angle from the Fermi LAT boresight is 45.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210202841/quicklook/glg_skymap_all_bn210202841.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210202841/quicklook/glg_healpix_all_bn210202841.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210202841/quicklook/glg_lc_medres34_bn210202841.gif
GCN Circular 29382
Subject
GRB 210202A: BALROG localization (Fermi Trigger / GRB 210202841)
Date
2021-02-02T21:25:11Z (4 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
at 20:10:31 on 02 Feb. 2021 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) = 223.5+/-1.5 deg
Decl.(2000.0) = -35.5+/-1.0 deg
We estimate an additional systematic error of 2 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB210202841/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB210202841/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB210202841/json
GCN Circular 29385
Subject
Fermi GRB 210202A: Global MASTER-Net observations report
Date
2021-02-03T03:30:15Z (4 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-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 210202A ( Fermi GBM team, GCN 29380) errorbox 10111 sec after notice time and 10140 sec after trigger time at 2021-02-02 22:59:31 UT, with upper limit up to 18.0 mag. The observations began at zenith distance = 71 deg. The sun altitude is -41.4 deg.
The galactic latitude b = 13 deg., longitude l = 333 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=1538815
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
10170 | 2021-02-02 22:59:31 | MASTER-SAAO | (15h 23m 17.00s , -42d 01m 04.8s) | C | 60 | 17.7 |
10420 | 2021-02-02 23:03:41 | MASTER-SAAO | (15h 16m 27.32s , -40d 00m 25.3s) | C | 60 | 18.0 |
10505 | 2021-02-02 23:05:06 | MASTER-SAAO | (15h 37m 27.39s , -40d 00m 36.0s) | C | 60 | 17.4 |
10585 | 2021-02-02 23:06:26 | MASTER-SAAO | (15h 31m 36.94s , -38d 01m 28.8s) | C | 60 | 17.7 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 29386
Subject
GRB 210202A: Fermi-LAT detection
Date
2021-02-03T05:58:46Z (4 years ago)
From
Rachel Hamburg at UAH <rkh0007@uah.edu>
R. Hamburg (UAH), M. Axelsson (KTH & Stockholm Univ.), M. Arimoto (Kanazawa
Univ.), and R. Pillera (Politecnico and INFN Bari) report on behalf of the
Fermi-LAT team:
On February 2, 2021, Fermi-LAT detected high-energy emission from GRB
210202A, which was also detected by Fermi-GBM (trigger 633989436 /
210202841, GCN 29380).
The best LAT on-ground location is found to be
RA, Dec = 230.0, -38.0 (J2000)
with an error radius of 0.7 deg (90 % containment, statistical error only).
This was 45 deg from the LAT boresight at the time of the GBM trigger:
T0 = 20:10:31.3 UT.
The data from the Fermi-LAT show a significant increase in the event rate
after the GBM trigger that is spatially and temporally correlated with the
GBM emission (3 degrees from the GBM location) with high significance.
The photon flux above 100 MeV in the time interval 0-100s after the GBM
trigger is (2.3 +/- 0.9)e-05 ph/cm2/s, while the flux above 1 GeV is (2.7
+/- 1.6)e-06 ph/cm2/s.
The estimated photon index above 100 MeV is -1.9 +/- 0.3.
The highest-energy photon is a 1.4 GeV event which is observed 19 seconds
after the GBM trigger.
A Swift ToO has been requested for this burst.
The Fermi-LAT point of contact for this burst is Rachel Hamburg (
rkh0007@uah.edu).
The Fermi-LAT is a pair conversion telescope designed to cover the energy
band from 20 MeV to greater than 300 GeV. It is the product of an
international collaboration between NASA and DOE in the U.S. and many
scientific institutions across France, Italy, Japan and Sweden.
GCN Circular 29387
Subject
GRB 210202A: Fermi GBM detection
Date
2021-02-03T16:34:35Z (4 years ago)
From
Rachel Hamburg at UAH <rkh0007@uah.edu>
C. Fletcher (USRA), B. Hristov (UAH) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
At 20:10:31.30 UT on 02 February 2021, the Fermi Gamma-Ray Burst Monitor
(GBM)
triggered and located GRB 210202A (trigger 633989436 / 210202841). There
was also
a Fermi/LAT ground detection (R. Hamburg et al., GCN 29386).
The Fermi GBM Final Real-time Localization was reported in GCN 29380.
It is consistent with the Fermi/LAT human-generated position.
The angle from the Fermi LAT boresight at the GBM trigger time is 45
degrees.
The GBM light curve consists of multiple peaks
with a duration (T90) of about 18 s (50-300 keV).
The time-averaged spectrum from T0+0.003 s to T0+18.7 s is
best fit by a power law function with an exponential
high-energy cutoff. The power law index is -0.71 +/- 0.03 and
the cutoff energy, parameterized as Epeak, is 297 +/- 12 keV.
The spectrum is also well fit by a Band function
with Epeak = 265 +/- 16 keV, alpha = -0.66 +/- 0.04,
and beta = -2.5 +/- 0.2.
The event fluence (10-1000 keV) in this time interval is
(1.670 +/- 0.036)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+1.5 s in the 10-1000 keV band
is 16 +/- 2 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 29389
Subject
GRB 210202A: AGILE/MCAL detection
Date
2021-02-03T18:36:16Z (4 years ago)
From
Alessandro Ursi at INAF/IAPS <alessandro.ursi@gmail.com>
A. Ursi, M. Cardillo (INAF/IAPS), C. Pittori (SSDC, and INAF/OAR), M.
Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Argan, C. Casentini, Y.
Evangelista, G. Piano (INAF/IAPS), F. Lucarelli, F. Verrecchia (SSDC, and
INAF/OAR), A. Bulgarelli, V. Fioretti, F. Fuschino, N. Parmiggiani
(INAF/OAS-Bologna), M. Marisaldi (INAF/OAS-Bologna, and Bergen University),
M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), F. Longo (Univ.
Trieste and INFN Trieste), A. Giuliani (INAF/IASF-Mi), report on behalf of
the AGILE Team:
The AGILE Mini-CALorimeter (MCAL) detected GRB 210202A at T0 = 2021-02-02
20:10:32.98 +/- 0.01 s (UTC), reported by Fermi/GBM (GCN #29380, #29387)
and Fermi/LAT (GCN #29386).
The event lasted about 2.5 s and released a total number of ~2000 counts in
the detector (in the 0.4-100 MeV energy range), above an average background
rate of 570 Hz.
The light curve shows a single peak and can be found at
http://www.agilescienceapp.it/notices/GRB210202A_AGILE_MCAL.png .
The time-integrated spectrum of the burst can be fitted in the energy range
0.4-10 MeV with a single power-law with ph.ind. = -3.01 -0.52/+0.84,
resulting in a reduced chi-squared of 0.90 (48 d.o.f.) and a fluence of
2.8e-06 ergs/cm^2 (90% confidence level), in the same energy range.
The event is also clearly visible in the scientific ratemeters of the
SuperAGILE (SA; 18-60 keV), MiniCALorimeter (MCAL; 0.4-100 MeV), and
AntiCoincidence (AC; 50-200 keV) detectors. The burst released 340 counts
in the SA detector (above a background rate of 100 Hz), 4580 counts in the
MCAL detector (above a background rate of 1260 Hz), and 12340 counts in the
AC detector (above a background rate of 3700 Hz). The AGILE ratemeters
light curves can be found at:
http://www.agilescienceapp.it/notices/GRB210202A_AGILE_RM.png .
The AGILE-MCAL detector is a CsI detector with a 4 pi FoV, sensitive in the
energy range 0.4-100 MeV. Additional analysis of AGILE data is in progress.
This GRB event did not generate an automatic alert notice. Automatic MCAL
GRB alert Notices can be found at: https://gcn.gsfc.nasa.gov/agile_mcal.html
.