Gamma-ray Burst 210202A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 02 Feb 21 20:10:55 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     633989436
GRB_RA:          226.650d {+15h 06m 36s} (J2000),
                 227.002d {+15h 08m 00s} (current),
                 225.819d {+15h 03m 16s} (1950)
GRB_DEC:         -43.617d {-43d 37' 00"} (J2000),
                 -43.697d {-43d 41' 48"} (current),
                 -43.424d {-43d 25' 26"} (1950)
GRB_ERROR:       6.75 [deg radius, statistical plus systematic]
GRB_INTEN:       486 [cnts/sec]
DATA_SIGNIF:     24.20 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        19247 TJD;    33 DOY;   21/02/02
GRB_TIME:        72631.30 SOD {20:10:31.30} UT
GRB_PHI:          63.00 [deg]
GRB_THETA:        40.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.45
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,1,1, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       316.68d {+21h 06m 43s}  -16.56d {-16d 33' 47"}
SUN_DIST:         78.41 [deg]   Sun_angle= 6.0 [hr] (West of Sun)
MOON_POSTN:      199.39d {+13h 17m 34s}   -3.42d {-03d 25' 17"}
MOON_DIST:        47.10 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      327.32, 12.76 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      236.73,-25.06 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210202841/quicklook/glg_lc_medres34_bn210202841.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 119.65,-18.42 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 02 Feb 21 20:11:04 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      59
TRIGGER_NUM:     633989436
GRB_RA:          226.750d {+15h 07m 00s} (J2000),
                 227.102d {+15h 08m 24s} (current),
                 225.918d {+15h 03m 40s} (1950)
GRB_DEC:         -43.583d {-43d 34' 59"} (J2000),
                 -43.663d {-43d 39' 48"} (current),
                 -43.391d {-43d 23' 27"} (1950)
GRB_ERROR:       4.10 [deg radius, statistical plus systematic]
GRB_INTEN:       1227 [cnts/sec]
DATA_SIGNIF:     85.60 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        19247 TJD;    33 DOY;   21/02/02
GRB_TIME:        72631.30 SOD {20:10:31.30} UT
GRB_PHI:          63.00 [deg]
GRB_THETA:        40.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.42
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,1,1, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       316.68d {+21h 06m 43s}  -16.56d {-16d 33' 47"}
SUN_DIST:         78.35 [deg]   Sun_angle= 6.0 [hr] (West of Sun)
MOON_POSTN:      199.39d {+13h 17m 35s}   -3.42d {-03d 25' 20"}
MOON_DIST:        47.11 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      327.40, 12.76 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      236.79,-25.00 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210202841/quicklook/glg_lc_medres34_bn210202841.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 119.65,-18.42 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 02 Feb 21 20:11:14 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     633989436
GRB_RA:          234.500d {+15h 38m 00s} (J2000),
                 234.848d {+15h 39m 24s} (current),
                 233.676d {+15h 34m 42s} (1950)
GRB_DEC:         -39.180d {-39d 10' 47"} (J2000),
                 -39.248d {-39d 14' 51"} (current),
                 -39.017d {-39d 01' 00"} (1950)
GRB_ERROR:       1.35 [deg radius, statistical only]
DATA_SIGNIF:     97.50 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        19247 TJD;    33 DOY;   21/02/02
GRB_TIME:        72631.30 SOD {20:10:31.30} UT
GRB_PHI:          60.00 [deg]
GRB_THETA:        47.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       316.68d {+21h 06m 43s}  -16.56d {-16d 33' 47"}
SUN_DIST:         73.39 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:      199.40d {+13h 17m 35s}   -3.42d {-03d 25' 22"}
MOON_DIST:        48.13 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      334.87, 13.15 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      241.54,-19.18 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210202841/quicklook/glg_lc_medres34_bn210202841.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_633989436.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        Bright hard burst in the GBM.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 02 Feb 21 20:12:19 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      3
TRIGGER_NUM:     633989436
GRB_RA:          230.770d {+15h 23m 05s} (J2000),
                 231.119d {+15h 24m 29s} (current),
                 229.945d {+15h 19m 47s} (1950)
GRB_DEC:         -40.780d {-40d 46' 47"} (J2000),
                 -40.854d {-40d 51' 13"} (current),
                 -40.602d {-40d 36' 08"} (1950)
GRB_ERROR:       1.11 [deg radius, statistical only]
DATA_SIGNIF:     76.70 [sigma]
DATA_INTERVAL:   12.288 [sec]
GRB_DATE:        19247 TJD;    33 DOY;   21/02/02
GRB_TIME:        72631.30 SOD {20:10:31.30} UT
GRB_PHI:          62.00 [deg]
GRB_THETA:        44.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       316.68d {+21h 06m 43s}  -16.56d {-16d 33' 46"}
SUN_DIST:         75.96 [deg]   Sun_angle= 5.7 [hr] (West of Sun)
MOON_POSTN:      199.41d {+13h 17m 37s}   -3.43d {-03d 25' 38"}
MOON_DIST:        47.05 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      331.52, 13.53 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      239.03,-21.47 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210202841/quicklook/glg_lc_medres34_bn210202841.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_633989436.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 02 Feb 21 20:19:55 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     633989436
GRB_RA:          232.230d {+15h 28m 55s} (J2000),
                 232.580d {+15h 30m 19s} (current),
                 231.404d {+15h 25m 37s} (1950)
GRB_DEC:         -40.400d {-40d 23' 59"} (J2000),
                 -40.472d {-40d 28' 17"} (current),
                 -40.228d {-40d 13' 39"} (1950)
GRB_ERROR:       1.67 [deg radius, statistical only]
GRB_DATE:        19247 TJD;    33 DOY;   21/02/02
GRB_TIME:        72631.30 SOD {20:10:31.30} UT
GRB_PHI:          61.00 [deg]
GRB_THETA:        45.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       316.68d {+21h 06m 44s}  -16.56d {-16d 33' 41"}
SUN_DIST:         74.94 [deg]   Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN:      199.47d {+13h 17m 54s}   -3.46d {-03d 27' 31"}
MOON_DIST:        47.53 [deg]
MOON_ILLUM:      71 [%]
GAL_COORDS:      332.68, 13.20 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      240.07,-20.80 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210202841/quicklook/glg_lc_medres34_bn210202841.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210202841/quicklook/glg_locplot_all_bn210202841.png
COMMENTS:        Fermi-GBM Final Position.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file should be available by the time this FINAL notice is produced.  
COMMENTS:        This notice was generated completely by automated pipeline processing.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This is likely a Long GRB.

GCN Circular #29380
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
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 #29384
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-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB210202.54 (trigger No 633963272,19h 48m 14.40s , +18d 44m 24.0s, R=2.8) errorbox 49098 sec after notice time and 49134 sec after trigger time at 2021-02-03 02:33:21 UT, with upper limit up to 15.7 mag. The observations began at zenith distance = 74 deg. The sun altitude is -26.3 deg.
The galactic latitude b = -4 deg., longitude l = 56 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1538398
We obtain a following upper limits.
```
Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

   47687 | 2021-02-03 02:08:43 |             MASTER- | (19h 41m 12.07s , +16d 04m 04.1s) |   C |    60 | 12.4 |        
   48180 | 2021-02-03 02:16:56 |             MASTER- | (19h 50m 09.48s , +22d 04m 08.9s) |   C |    60 | 13.7 |        
   49164 | 2021-02-03 02:33:21 |      MASTER-Tavrida | (19h 28m 57.40s , +20d 08m 19.5s) |   C |    60 | 15.7 |  
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #29385
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 NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 03 Feb 21 03:41:34 UT
NOTICE_TYPE:     Fermi-LAT Offline Position
TRIGGER_NUM:     210202841
GRB_RA:          230.682d {+15h 22m 44s} (J2000),
                 231.026d {+15h 24m 06s} (current),
                 229.867d {+15h 19m 28s} (1950)
GRB_DEC:         -39.189d {-39d 11' 19"} (J2000),
                 -39.263d {-39d 15' 46"} (current),
                 -39.011d {-39d 00' 39"} (1950)
GRB_ERROR:       30.00 [arcmin radius, 90% containment, statistical only]
GRB_DATE:        19247 TJD;    33 DOY;   21/02/02
GRB_TIME:        72631.29 SOD {20:10:31.29} UT
TRIGGER_ID:      0x20000000
MISC:            0x40000000
SUN_POSTN:       317.00d {+21h 07m 59s}  -16.47d {-16d 28' 16"}
SUN_DIST:         76.61 [deg]   Sun_angle= 5.7 [hr] (West of Sun)
MOON_POSTN:      203.43d {+13h 33m 44s}   -5.27d {-05d 15' 57"}
MOON_DIST:        42.15 [deg]
MOON_ILLUM:      68 [%]
GAL_COORDS:      332.39, 14.88 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      238.50,-19.95 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi LAT Offline position.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        It is the result of human-in-the-loop processing.  
COMMENTS:        This is a human generated position of a LAT ground detection and was also a GBM trigger classified as a GRB.  
COMMENTS:        This source corresponds to GBM trigger.

GCN Circular #29386
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
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
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 .

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Jochen Greiner, last update: 03-Feb-2021 [Disclaimer]