Gamma-ray Burst 211019A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 19 Oct 21 05:59:55 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     656315976
GRB_RA:          111.017d {+07h 24m 04s} (J2000),
                 111.226d {+07h 24m 54s} (current),
                 110.538d {+07h 22m 09s} (1950)
GRB_DEC:         -31.883d {-31d 52' 59"} (J2000),
                 -31.927d {-31d 55' 36"} (current),
                 -31.785d {-31d 47' 03"} (1950)
GRB_ERROR:       6.33 [deg radius, statistical plus systematic]
GRB_INTEN:       720 [cnts/sec]
DATA_SIGNIF:     11.10 [sigma]
INTEG_TIME:      0.128 [sec]
GRB_DATE:        19506 TJD;   292 DOY;   21/10/19
GRB_TIME:        21571.19 SOD {05:59:31.19} UT
GRB_PHI:          81.00 [deg]
GRB_THETA:        70.00 [deg]
DATA_TIME_SCALE: 0.1280 [sec]
HARD_RATIO:      0.00
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:     100%  Below horizon
2nd_MOST_LIKELY:   0%  n/a
DETECTORS:       0,0,1, 0,0,0, 0,0,0, 1,1,0, 0,0,
SUN_POSTN:       204.18d {+13h 36m 43s}  -10.07d {-10d 04' 05"}
SUN_DIST:         87.17 [deg]   Sun_angle= 6.2 [hr] (West of Sun)
MOON_POSTN:       11.15d {+00h 44m 37s}   +0.41d {+00d 24' 20"}
MOON_DIST:        98.75 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      244.92, -7.68 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      120.49,-53.12 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211019250/quicklook/glg_lc_medres34_bn211019250.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 212.73,-17.25 [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 19 Oct 21 06:00:12 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     656315976
GRB_RA:          109.300d {+07h 17m 12s} (J2000),
                 109.490d {+07h 17m 58s} (current),
                 108.864d {+07h 15m 27s} (1950)
GRB_DEC:         -37.950d {-37d 57' 00"} (J2000),
                 -37.990d {-37d 59' 24"} (current),
                 -37.859d {-37d 51' 31"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
DATA_SIGNIF:     69.40 [sigma]
DATA_INTERVAL:   0.512 [sec]
GRB_DATE:        19506 TJD;   292 DOY;   21/10/19
GRB_TIME:        21571.19 SOD {05:59:31.19} UT
GRB_PHI:          79.00 [deg]
GRB_THETA:        64.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       204.18d {+13h 36m 43s}  -10.07d {-10d 04' 05"}
SUN_DIST:         87.47 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:       11.15d {+00h 44m 37s}   +0.41d {+00d 24' 24"}
MOON_DIST:        96.81 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      249.80,-11.64 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      120.74,-59.35 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211019250/quicklook/glg_lc_medres34_bn211019250.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_656315976.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
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 19 Oct 21 06:00:04 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      59
TRIGGER_NUM:     656315976
GRB_RA:          100.767d {+06h 43m 04s} (J2000),
                 100.929d {+06h 43m 43s} (current),
                 100.394d {+06h 41m 35s} (1950)
GRB_DEC:         -44.450d {-44d 27' 00"} (J2000),
                 -44.473d {-44d 28' 21"} (current),
                 -44.399d {-44d 23' 55"} (1950)
GRB_ERROR:       3.97 [deg radius, statistical plus systematic]
GRB_INTEN:       1467 [cnts/sec]
DATA_SIGNIF:     135.30 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        19506 TJD;   292 DOY;   21/10/19
GRB_TIME:        21571.19 SOD {05:59:31.19} UT
GRB_PHI:          81.00 [deg]
GRB_THETA:        55.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.43
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      93%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,1, 0,0,0, 0,0,0, 1,1,0, 0,0,
SUN_POSTN:       204.18d {+13h 36m 43s}  -10.07d {-10d 04' 05"}
SUN_DIST:         92.21 [deg]   Sun_angle= 6.9 [hr] (West of Sun)
MOON_POSTN:       11.15d {+00h 44m 37s}   +0.41d {+00d 24' 22"}
MOON_DIST:        90.12 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      253.53,-20.03 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      110.08,-67.14 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211019250/quicklook/glg_lc_medres34_bn211019250.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 212.73,-17.25 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Tue 19 Oct 21 06:00:52 UT
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    9453,   Sub_Num: 0
GRB_INTEN:      9.55 [sigma]
GRB_TIME:       21572.69 SOD {05:59:32.69} UT
GRB_DATE:       19506 TJD;   292 DOY;   21/10/19
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.  
COMMENTS:       Time_Scale=2.0000 and Time_Error=1.0000.  
COMMENTS:
COMMENTS:       NOTE: This SPIACS event is temporally(1.0<100sec) coincident with the FERMI_GBM event (trignum=656315976).  
COMMENTS:
COMMENTS:       The SPIACS lightcurve can be found at:  
COMMENTS:       ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2021-10/2021-10-19T05-59-32.5648-20871-23440-0.lc

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 19 Oct 21 06:01:08 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      3
TRIGGER_NUM:     656315976
GRB_RA:          109.300d {+07h 17m 12s} (J2000),
                 109.490d {+07h 17m 58s} (current),
                 108.864d {+07h 15m 27s} (1950)
GRB_DEC:         -37.950d {-37d 57' 00"} (J2000),
                 -37.990d {-37d 59' 24"} (current),
                 -37.859d {-37d 51' 31"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
DATA_SIGNIF:     121.00 [sigma]
DATA_INTERVAL:   8.192 [sec]
GRB_DATE:        19506 TJD;   292 DOY;   21/10/19
GRB_TIME:        21571.19 SOD {05:59:31.19} UT
GRB_PHI:          79.00 [deg]
GRB_THETA:        64.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       204.18d {+13h 36m 44s}  -10.07d {-10d 04' 06"}
SUN_DIST:         87.47 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:       11.16d {+00h 44m 39s}   +0.41d {+00d 24' 37"}
MOON_DIST:        96.81 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      249.80,-11.64 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      120.74,-59.35 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211019250/quicklook/glg_lc_medres34_bn211019250.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_656315976.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        Bright hard burst in the GBM.  
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.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(1.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=9453).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 19 Oct 21 06:08:48 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     656315976
GRB_RA:          109.210d {+07h 16m 50s} (J2000),
                 109.400d {+07h 17m 36s} (current),
                 108.774d {+07h 15m 06s} (1950)
GRB_DEC:         -37.830d {-37d 49' 47"} (J2000),
                 -37.870d {-37d 52' 11"} (current),
                 -37.739d {-37d 44' 21"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
GRB_DATE:        19506 TJD;   292 DOY;   21/10/19
GRB_TIME:        21571.19 SOD {05:59:31.19} UT
GRB_PHI:          79.00 [deg]
GRB_THETA:        64.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       204.19d {+13h 36m 45s}  -10.07d {-10d 04' 13"}
SUN_DIST:         87.56 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:       11.22d {+00h 44m 53s}   +0.44d {+00d 26' 23"}
MOON_DIST:        96.72 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      249.66,-11.65 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      120.55,-59.25 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211019250/quicklook/glg_lc_medres34_bn211019250.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211019250/quicklook/glg_locplot_all_bn211019250.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:        Bright hard burst in the GBM.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(1.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=9453).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 19 Oct 21 10:23:07 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     656315976
GRB_RA:          109.560d {+07h 18m 14s} (J2000),
                 109.746d {+07h 18m 59s} (current),
                 109.133d {+07h 16m 32s} (1950)
GRB_DEC:         -39.190d {-39d 11' 23"} (J2000),
                 -39.231d {-39d 13' 50"} (current),
                 -39.098d {-39d 05' 51"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
GRB_DATE:        19506 TJD;   292 DOY;   21/10/19
GRB_TIME:        21571.19 SOD {05:59:31.19} UT
GRB_PHI:          78.19 [deg]
GRB_THETA:        63.07 [deg]
E_RANGE:         50.000 - 300.000 [keV]
LOC_ALGORITHM:   415 (Gnd S/W Version number)
SUN_POSTN:       204.35d {+13h 37m 25s}  -10.13d {-10d 08' 02"}
SUN_DIST:         87.13 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:       13.19d {+00h 52m 47s}   +1.42d {+01d 25' 05"}
MOON_DIST:        95.97 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      251.03,-11.98 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      121.79,-60.49 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211019250/quicklook/glg_lc_medres34_bn211019250.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211019250/quicklook/glg_locplot_all_bn211019250.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 has human-in-the-loop processing.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(1.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=9453).

GCN Circular #30941
The Fermi GBM team reports the detection of a likely LONG GRB
At 05:59:31 UT on 19 Oct 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 211019A (trigger 656315976.19434 / 211019250).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 109.2, Dec = -37.8 (J2000 degrees, equivalent to J2000 07h 16m, -37d 47'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 64.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211019250/quicklook/glg_skymap_all_bn211019250.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/bn211019250/quicklook/glg_healpix_all_bn211019250.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211019250/quicklook/glg_lc_medres34_bn211019250.gif
GCN Circular #30942
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 656315976 at 05:59:31 on 19 Oct. 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) = 107.1+/-0.7 deg
Decl.(2000.0) = -38.6+/-0.7 deg
```
We estimate an additional systematic error of 2 deg.
Further details are available at: https://grb.mpe.mpg.de/grb/GRB211019250/
The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB211019250/healpix
The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB211019250/json

GCN Circular #30944
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 211019A ( Fermi GBM team, GCN 30941) errorbox 91 sec after notice time and 130 sec after trigger time at 2021-10-19 06:01:42 UT, with upper limit up to 17.3 mag. Observations started at twilight. The observations began at zenith distance = 66 deg. The sun altitude is -14.8 deg.
MASTER-OAFA robotic telescope located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 211019A errorbox 10590 sec after notice time and 10629 sec after trigger time at 2021-10-19 08:56:41 UT, with upper limit up to 17.6 mag. Observations started at twilight. The observations began at zenith distance = 14 deg. The sun altitude is -12.1 deg.
The galactic latitude b = -12 deg., longitude l = 251 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1756842
We obtain a following upper limits.

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

     146 | 2021-10-19 06:01:42 |          MASTER-IAC | (07h 17m 09.18s , -37d 56m 16.1s) |  P| |    30 | 13.8 |        
     186 | 2021-10-19 06:01:42 |          MASTER-IAC | (07h 17m 09.18s , -37d 56m 16.1s) |  P| |   110 | 14.7 |  Coadd 
     146 | 2021-10-19 06:01:42 |          MASTER-IAC | (07h 16m 10.91s , -37d 50m 38.7s) |  P- |    30 | 13.5 |        
     186 | 2021-10-19 06:01:42 |          MASTER-IAC | (07h 16m 10.91s , -37d 50m 38.7s) |  P- |   110 | 14.6 |  Coadd 
     197 | 2021-10-19 06:02:33 |          MASTER-IAC | (07h 17m 04.65s , -37d 56m 56.7s) |  P| |    30 | 13.9 |        
     197 | 2021-10-19 06:02:33 |          MASTER-IAC | (07h 16m 06.36s , -37d 51m 18.8s) |  P- |    30 | 13.9 |        
     257 | 2021-10-19 06:03:23 |          MASTER-IAC | (07h 17m 04.32s , -37d 55m 58.0s) |  P| |    50 | 14.5 |        
     257 | 2021-10-19 06:03:23 |          MASTER-IAC | (07h 16m 06.03s , -37d 50m 20.6s) |  P- |    50 | 14.4 |        
     334 | 2021-10-19 06:04:34 |          MASTER-IAC | (07h 17m 09.19s , -37d 56m 59.7s) |  P| |    60 | 16.0 |        
     424 | 2021-10-19 06:04:34 |          MASTER-IAC | (07h 17m 09.20s , -37d 56m 59.7s) |  P| |   240 | 17.3 |  Coadd 
     334 | 2021-10-19 06:04:34 |          MASTER-IAC | (07h 16m 10.90s , -37d 51m 23.7s) |  P- |    60 | 15.7 |        
     424 | 2021-10-19 06:04:34 |          MASTER-IAC | (07h 16m 10.90s , -37d 51m 23.7s) |  P- |   240 | 17.1 |  Coadd 
     424 | 2021-10-19 06:05:55 |          MASTER-IAC | (07h 17m 04.40s , -37d 58m 01.9s) |  P| |    80 | 16.6 |        
     424 | 2021-10-19 06:05:55 |          MASTER-IAC | (07h 16m 06.17s , -37d 52m 25.3s) |  P- |    80 | 16.4 |        
     535 | 2021-10-19 06:07:35 |          MASTER-IAC | (07h 17m 10.22s , -37d 58m 01.5s) |  P| |   100 | 17.1 |        
     535 | 2021-10-19 06:07:35 |          MASTER-IAC | (07h 16m 12.08s , -37d 52m 25.3s) |  P- |   100 | 16.9 |        
     665 | 2021-10-19 06:09:36 |          MASTER-IAC | (07h 17m 07.05s , -37d 56m 23.7s) |  P| |   120 | 17.3 |        
     665 | 2021-10-19 06:09:36 |          MASTER-IAC | (07h 16m 08.99s , -37d 50m 47.4s) |  P- |   120 | 17.1 |        
   10660 | 2021-10-19 08:56:41 |         MASTER-OAFA | (07h 10m 41.71s , -39d 22m 20.0s) |   C |    60 | 17.6 |        
   10903 | 2021-10-19 09:00:43 |         MASTER-OAFA | (07h 08m 39.36s , -37d 27m 29.3s) |   C |    60 | 17.5 |        
   10983 | 2021-10-19 09:02:04 |         MASTER-OAFA | (07h 18m 38.70s , -37d 26m 09.7s) |   C |    60 | 17.3 |        
   11381 | 2021-10-19 09:08:42 |         MASTER-OAFA | (07h 12m 16.15s , -41d 14m 31.8s) |   C |    60 | 16.7 |

Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.

GCN Circular #30946
J. Ripa (Masaryk U.), M. Ohno (Eotvos U./Konkoly Observatory/Hiroshima U.), H. Takahashi (Hiroshima U.), A. Pal, L. Meszaros, B. Csak (Konkoly Observatory), N. Werner, M. Topinka, F. Munz, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Yuusuke Uchida, Helen Poon, H. Matake, N. Uchida (Hiroshima U.), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.) -- the GRBAlpha collaboration.
The bright/long duration GRB 211019A (Fermi-GBM detection; GCN Circ. 30941, BALROG localization; Kunzweiler et al., GCN 30942) was detected by the GRBAlpha 1U CubeSat (Pal et al. Proc. SPIE 2020).
The light curve shows a strong FRED-like structure with the duration of about 40 s (T90 = 36 s). At 05:59:34 UTC, our detection reached a peak SNR ~ 39.
The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB211019A_GCN.pdf
GRBAlpha is a demonstration mission for a future CubeSats constellation (Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~50 keV to ~1000 keV. GRBAlpha was launched on 2021 March 22 from Baikonur. After its commissioning phase, the scientific observations are now under way. To increase the duty cycle and the downlink rate, the upgrade of the on-board data acquisition software stack is in progress. The ground segment is also supported by the radio amateur community and it takes advantage of the SatNOGS network for increased data downlink volume.
GCN Circular #30993
A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin on behalf of the MGNS/BepiColombo and HEND/Mars Odyssey teams,
J. Benkhoff on behalf of the BepiColombo team,
K. Hurley on behalf of the IPN,
D. Svinkin, S. Golenetskii, D. Frederiks, A. Ridnaia, A. Lysenko, 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,
and
W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on behalf of the GRS-Odyssey GRB team, report:
The bright, long-duration GRB 211019A (Fermi-GBM detection: The Fermi GBM team, GCN Circ. 30941; BALROG localization: F. Kunzweiler et al., GCN Circ. 30942; GRBAlpha detection: J. Ripa et al., GCN Circ. 30946) was detected by BepiColombo (MGNS; see introductory GCN Circ. 30949), Mars-Odyssey (HEND), GRBAlpha, Fermi (GBM trigger 656315976), Konus-Wind, and INTEGRAL (SPI-ACS), at about 21571 s UT (05:59:31).
The burst light curves in the energy range 30 keV-1.5 MeV (HEND) and 250-450 keV (MGNS) exhibit a bright peak with a total duration of ~17 s.
We have triangulated GRB 211019A to the following 3 sigma annuli:
```
---------------------------------------------------------
           R.A.(J2000)  Dec.(J2000)    R      +dR     -dR
               deg         deg        deg     deg     deg
---------------------------------------------------------
MGNS-HEND    27.190     10.927     89.034  +0.021  -0.022
Konus-HEND  200.705     -8.093     87.815  +0.017  -0.017
Konus-GBM   190.965     -7.594     80.456  +0.431  -0.431
---------------------------------------------------------
```
The MGNS-HEND and Konus-HEND annuli intersect to form two error boxes one of which is inconsistent with the Konus-GBM annulus, the KW ecliptic latitude response, and the Fermi (GBM) RoboBA and BALROG localizations.
The correct preliminary, 3 sigma error box is:
```
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   106.988 (07h 07m 57s) -38.779 (-38d 46' 43")
  Corners:
   106.975 (07h 07m 54s) -38.728 (-38d 43' 41")
   106.898 (07h 07m 36s) -39.122 (-39d 07' 19")
   107.002 (07h 08m 01s) -38.819 (-38d 49' 07")
   107.079 (07h 08m 19s) -38.424 (-38d 25' 25")
  ---------------------------------------------
```
The error box area is 49 sq. arcmin, and its maximum dimension is 43 arcmin (the minimum one is 2.0 arcmin). The Sun distance was 89 deg.
This box may be improved.
A triangulation maps are posted at: http://www.ioffe.ru/LEA/GRBs/GRB211019_T21573/IPN/ and http://l503.iki.rssi.ru/owncloud/index.php/s/bRzLdux7RLz1tVf

Back to JG's homepage

Jochen Greiner, last update: 25-Oct-2021 [Disclaimer]