Gamma-ray Burst 211130A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 30 Nov 21 15:17:05 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      60
TRIGGER_NUM:     659978192
GRB_RA:           26.133d {+01h 44m 32s} (J2000),
                  26.364d {+01h 45m 27s} (current),
                  25.606d {+01h 42m 25s} (1950)
GRB_DEC:         -42.767d {-42d 46' 00"} (J2000),
                 -42.657d {-42d 39' 25"} (current),
                 -43.017d {-43d 01' 01"} (1950)
GRB_ERROR:       5.27 [deg radius, statistical plus systematic]
GRB_INTEN:       714 [cnts/sec]
DATA_SIGNIF:     45.80 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        19548 TJD;   334 DOY;   21/11/30
GRB_TIME:        54987.03 SOD {15:16:27.03} UT
GRB_PHI:         260.98 [deg]
GRB_THETA:        55.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.81
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      98%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       0,0,0, 0,1,0, 0,1,0, 0,0,0, 0,0,
SUN_POSTN:       246.91d {+16h 27m 39s}  -21.74d {-21d 44' 24"}
SUN_DIST:        105.55 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:      197.63d {+13h 10m 30s}   -3.61d {-03d 36' 18"}
MOON_DIST:       133.07 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      271.75,-71.00 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        2.31,-48.73 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211130636/quicklook/glg_lc_medres34_bn211130636.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 138.35,-2.30 [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 30 Nov 21 15:17:33 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      59
TRIGGER_NUM:     659978192
GRB_RA:           22.900d {+01h 31m 36s} (J2000),
                  23.150d {+01h 32m 36s} (current),
                  22.328d {+01h 29m 19s} (1950)
GRB_DEC:         -32.500d {-32d 30' 00"} (J2000),
                 -32.388d {-32d 23' 15"} (current),
                 -32.757d {-32d 45' 24"} (1950)
GRB_ERROR:       5.40 [deg radius, statistical only]
DATA_SIGNIF:     15.70 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        19548 TJD;   334 DOY;   21/11/30
GRB_TIME:        54987.03 SOD {15:16:27.03} UT
GRB_PHI:         253.00 [deg]
GRB_THETA:        63.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       246.91d {+16h 27m 39s}  -21.74d {-21d 44' 24"}
SUN_DIST:        111.60 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      197.63d {+13h 10m 31s}   -3.61d {-03d 36' 25"}
MOON_DIST:       143.63 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      247.02,-79.77 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        6.42,-38.57 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211130636/quicklook/glg_lc_medres34_bn211130636.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_659978192.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
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 30 Nov 21 15:17:03 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     659978192
GRB_RA:           19.567d {+01h 18m 16s} (J2000),
                  19.821d {+01h 19m 17s} (current),
                  18.985d {+01h 15m 56s} (1950)
GRB_DEC:         -32.517d {-32d 31' 00"} (J2000),
                 -32.402d {-32d 24' 06"} (current),
                 -32.779d {-32d 46' 45"} (1950)
GRB_ERROR:       10.88 [deg radius, statistical plus systematic]
GRB_INTEN:       177 [cnts/sec]
DATA_SIGNIF:     8.40 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        19548 TJD;   334 DOY;   21/11/30
GRB_TIME:        54987.03 SOD {15:16:27.03} UT
GRB_PHI:         255.00 [deg]
GRB_THETA:        65.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      1.57
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      85%  GRB
2nd_MOST_LIKELY:  14%  Generic SGR
DETECTORS:       0,0,0, 0,1,0, 0,1,0, 0,0,0, 0,0,
SUN_POSTN:       246.91d {+16h 27m 39s}  -21.74d {-21d 44' 24"}
SUN_DIST:        109.60 [deg]   Sun_angle= -8.9 [hr] (East of Sun)
MOON_POSTN:      197.63d {+13h 10m 30s}   -3.61d {-03d 36' 17"}
MOON_DIST:       143.93 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      257.36,-82.07 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        3.26,-37.27 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211130636/quicklook/glg_lc_medres34_bn211130636.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 138.35,-2.30 [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 30 Nov 21 15:18:28 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      0
TRIGGER_NUM:     659978192
GRB_RA:           21.910d {+01h 27m 38s} (J2000),
                  22.162d {+01h 28m 39s} (current),
                  21.333d {+01h 25m 20s} (1950)
GRB_DEC:         -31.810d {-31d 48' 35"} (J2000),
                 -31.697d {-31d 41' 48"} (current),
                 -32.069d {-32d 04' 07"} (1950)
GRB_ERROR:       5.28 [deg radius, statistical only]
DATA_SIGNIF:     18.20 [sigma]
DATA_INTERVAL:   5.120 [sec]
GRB_DATE:        19548 TJD;   334 DOY;   21/11/30
GRB_TIME:        54987.03 SOD {15:16:27.03} UT
GRB_PHI:         253.00 [deg]
GRB_THETA:        64.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       246.91d {+16h 27m 40s}  -21.74d {-21d 44' 24"}
SUN_DIST:        111.51 [deg]   Sun_angle= -9.0 [hr] (East of Sun)
MOON_POSTN:      197.64d {+13h 10m 33s}   -3.61d {-03d 36' 40"}
MOON_DIST:       144.43 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      245.82,-80.84 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        5.88,-37.57 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211130636/quicklook/glg_lc_medres34_bn211130636.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_659978192.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
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(5.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=9547).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 30 Nov 21 15:18:39 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      2
TRIGGER_NUM:     659978192
GRB_RA:           23.270d {+01h 33m 05s} (J2000),
                  23.522d {+01h 34m 05s} (current),
                  22.694d {+01h 30m 46s} (1950)
GRB_DEC:         -30.450d {-30d 26' 59"} (J2000),
                 -30.338d {-30d 20' 16"} (current),
                 -30.706d {-30d 42' 22"} (1950)
GRB_ERROR:       2.24 [deg radius, statistical only]
DATA_SIGNIF:     42.80 [sigma]
DATA_INTERVAL:   7.168 [sec]
GRB_DATE:        19548 TJD;   334 DOY;   21/11/30
GRB_TIME:        54987.03 SOD {15:16:27.03} UT
GRB_PHI:         251.00 [deg]
GRB_THETA:        64.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       246.92d {+16h 27m 40s}  -21.74d {-21d 44' 25"}
SUN_DIST:        113.29 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      197.64d {+13h 10m 33s}   -3.61d {-03d 36' 43"}
MOON_DIST:       145.59 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      235.40,-80.30 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        7.97,-36.90 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211130636/quicklook/glg_lc_medres34_bn211130636.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_659978192.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
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(5.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=9547).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 30 Nov 21 15:18:40 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      3
TRIGGER_NUM:     659978192
GRB_RA:           22.260d {+01h 29m 02s} (J2000),
                  22.516d {+01h 30m 04s} (current),
                  21.676d {+01h 26m 42s} (1950)
GRB_DEC:         -28.540d {-28d 32' 23"} (J2000),
                 -28.427d {-28d 25' 37"} (current),
                 -28.798d {-28d 47' 52"} (1950)
GRB_ERROR:       2.20 [deg radius, statistical only]
DATA_SIGNIF:     42.70 [sigma]
DATA_INTERVAL:   12.288 [sec]
GRB_DATE:        19548 TJD;   334 DOY;   21/11/30
GRB_TIME:        54987.03 SOD {15:16:27.03} UT
GRB_PHI:         250.00 [deg]
GRB_THETA:        66.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       246.92d {+16h 27m 40s}  -21.74d {-21d 44' 25"}
SUN_DIST:        114.04 [deg]   Sun_angle= -9.0 [hr] (East of Sun)
MOON_POSTN:      197.64d {+13h 10m 33s}   -3.61d {-03d 36' 43"}
MOON_DIST:       147.62 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      224.75,-81.57 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        8.07,-34.80 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211130636/quicklook/glg_lc_medres34_bn211130636.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_659978192.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
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(5.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=9547).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 30 Nov 21 15:25:47 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     659978192
GRB_RA:           18.330d {+01h 13m 19s} (J2000),
                  18.593d {+01h 14m 22s} (current),
                  17.729d {+01h 10m 55s} (1950)
GRB_DEC:         -24.310d {-24d 18' 35"} (J2000),
                 -24.194d {-24d 11' 38"} (current),
                 -24.575d {-24d 34' 28"} (1950)
GRB_ERROR:       1.45 [deg radius, statistical only]
GRB_DATE:        19548 TJD;   334 DOY;   21/11/30
GRB_TIME:        54987.03 SOD {15:16:27.03} UT
GRB_PHI:         249.00 [deg]
GRB_THETA:        72.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       246.92d {+16h 27m 41s}  -21.74d {-21d 44' 27"}
SUN_DIST:        114.30 [deg]   Sun_angle= -8.8 [hr] (East of Sun)
MOON_POSTN:      197.70d {+13h 10m 49s}   -3.64d {-03d 38' 35"}
MOON_DIST:       152.15 [deg]
MOON_ILLUM:      19 [%]
GAL_COORDS:      184.38,-84.32 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        6.54,-29.45 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211130636/quicklook/glg_lc_medres34_bn211130636.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211130636/quicklook/glg_locplot_all_bn211130636.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:        This is likely a Long GRB.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(5.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=9547).

GCN Circular #31151
The Fermi GBM team reports the detection of a likely LONG GRB
At 15:16:27 UT on 30 Nov 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 211130A (trigger 659978192.028088 / 211130636).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 18.3, Dec = -24.3 (J2000 degrees, equivalent to J2000 01h 13m, -24d 18'), with a statistical uncertainty of 1.4 degrees.
The angle from the Fermi LAT boresight is 72.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211130636/quicklook/glg_skymap_all_bn211130636.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/bn211130636/quicklook/glg_healpix_all_bn211130636.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211130636/quicklook/glg_lc_medres34_bn211130636.gif
GCN Circular #31152
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 659978192 at 15:16:27 on 30 Nov. 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) = 18.8+/-3.0 deg
Decl.(2000.0) = -28.5+/-3.8 deg
```
We estimate an additional systematic error of 2 deg.
Further details are available at: https://grb.mpe.mpg.de/grb/GRB211130636/
The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB211130636/healpix
The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB211130636/json

GCN Circular #31154
V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, T.Pogrosheva, E.Minkina, A.Chasovnikov, V.Topolev, V.Grinshpun, 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 (Irkutsk State University, API),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov (Blagoveschensk Educational State University)
MASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 211130A ( Fermi GBM team, GCN 31151) errorbox 693 sec after notice time and 732 sec after trigger time at 2021-11-30 15:28:39 UT, with upper limit up to 17.5 mag. The observations began at zenith distance = 74 deg. The sun altitude is -19.8 deg.
The galactic latitude b = -84 deg., longitude l = 185 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1800540
We obtain a following upper limits.

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

     802 | 2021-11-30 15:28:39 |   MASTER-Kislovodsk | (01h 12m 10.65s , -24d 10m 36.9s) |  P- |   140 | 15.5 |        
     802 | 2021-11-30 15:28:39 |   MASTER-Kislovodsk | (01h 12m 21.91s , -24d 33m 47.5s) |   C |   140 | 13.6 |        
     983 | 2021-11-30 15:31:19 |   MASTER-Kislovodsk | (01h 12m 07.92s , -24d 09m 06.7s) |  P- |   180 | 16.8 |        
     983 | 2021-11-30 15:31:19 |   MASTER-Kislovodsk | (01h 12m 25.40s , -24d 32m 24.1s) |   C |   180 | 13.2 |        
    1183 | 2021-11-30 15:34:40 |   MASTER-Kislovodsk | (01h 12m 08.03s , -24d 10m 12.7s) |  P- |   180 | 16.5 |        
    1183 | 2021-11-30 15:34:40 |   MASTER-Kislovodsk | (01h 12m 20.64s , -24d 33m 26.8s) |   C |   180 | 12.8 |        
    1384 | 2021-11-30 15:38:00 |   MASTER-Kislovodsk | (01h 12m 10.08s , -24d 08m 56.4s) |  P- |   180 | 16.6 |        
    1564 | 2021-11-30 15:38:00 |   MASTER-Kislovodsk | (01h 12m 10.08s , -24d 08m 56.4s) |  P- |   540 | 17.5 |  Coadd 
    1384 | 2021-11-30 15:38:00 |   MASTER-Kislovodsk | (01h 12m 22.20s , -24d 32m 06.5s) |   C |   180 | 13.5 |        
    1584 | 2021-11-30 15:41:21 |   MASTER-Kislovodsk | (01h 12m 04.09s , -24d 09m 34.1s) |  P- |   180 | 17.0 |        
    1584 | 2021-11-30 15:41:21 |   MASTER-Kislovodsk | (01h 12m 16.60s , -24d 32m 42.7s) |   C |   180 | 13.7 |        
    1784 | 2021-11-30 15:44:41 |   MASTER-Kislovodsk | (01h 12m 05.14s , -24d 08m 31.6s) |  P- |   180 | 17.1 |        
    1785 | 2021-11-30 15:44:41 |   MASTER-Kislovodsk | (01h 12m 18.01s , -24d 31m 39.2s) |   C |   180 | 15.0 |        
    6472 | 2021-11-30 17:03:49 |   MASTER-Kislovodsk | (01h 22m 39.34s , -25d 13m 11.6s) |   C |    60 | 12.8 |        
    6793 | 2021-11-30 17:09:10 |   MASTER-Kislovodsk | (01h 04m 47.15s , -23d 20m 56.2s) |   C |    60 | 15.2 |

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

GCN Circular #31161
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,
A. Ridnaia, D. Frederiks, D. Svinkin, A. Lysenko, 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 long-duration GRB 211130A (Fermi GBM Final Real-time localization: The Fermi GBM team, GCN 31151; BALROG localization: Kunzweiler et al., GCN 31152) was detected by Fermi (GBM trigger 659978192), Konus-Wind, INTEGRAL (SPI-ACS), and BepiColombo (MGNS) at about 54987 s UT (15:16:27).
We have triangulated it to a preliminary, 3 sigma error box whose coordinates are:
```
 ---------------------------------------------
  RA(2000), deg                 Dec(2000), deg
 ---------------------------------------------
 Center:
   21.148 (01h 24m 35s) -27.829 (-27d 49' 46")
 Corners:
   20.183 (01h 20m 44s) -27.190 (-27d 11' 25")
   20.317 (01h 21m 16s) -27.403 (-27d 24' 10")
   22.106 (01h 28m 25s) -28.433 (-28d 25' 58")
   21.973 (01h 27m 54s) -28.233 (-28d 13' 58")
 ---------------------------------------------
```
The error box area is 734 sq. arcmin, and its maximum dimension is 2.1 deg (the minimum one is 6.5 arcmin). The Sun distance was 113 deg.
This box may be improved.
The IPN localization is consistent with, but reduces the area of, the Fermi final position and BALROG localizations.
A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB211130_T54992/IPN
The time history and spectrum will be given in forthcoming GCN Circulars.
GCN Circular #31162
A. Ridnaia, D. Frederiks, A. Lysenko, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline on behalf of the Konus-Wind team, report:
The long-duration GRB 211130A (Fermi GBM Final Real-time localization: The Fermi GBM team, GCN 31151; BALROG localization: Kunzweiler et al., GCN 31152; IPN triangulation: Kozyrev et al., GCN 31161) triggered Konus-Wind at T0=54992.505 s UT (15:16:32.505).
The burst light curve starts with a smooth pulse, which was followed, after a period of low-level emission, by a more intense, multi-peaked emission complex. The total burst duration is ~21.4 s. The emission is seen up to ~6 MeV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB211130_T54992/
As observed by Konus-Wind, the burst had a fluence of 9.57(-0.68,+0.75)x10^-6 erg/cm2, and a 64-ms peak flux, measured from T0+13.456 s, of 8.39(-2.23,+2.99)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+16.640 s) is best fit in the 20 keV - 6 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.54(-0.24,+0.27) and Ep = 164(-15,+19) keV (chi2 = 82/75 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.5 (chi2 = 82/74).
The spectrum near the maximum count rate (measured from T0+8.448 to T0+16.640 s) is best fit in the 20 keV - 6 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.40(-0.34,+0.47), the high energy photon index beta = -2.69(-1.55,+0.43), the peak energy Ep = 177(-31,+34) keV (chi2 = 56/73 dof).
All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
GCN Circular #31196
S. de Wet (UCT), P.J. Groot (Radboud/UCT/SAAO), A.J. Levan (Radboud), P.M. Vreeswijk (Radboud), report on behalf of the MeerLICHT consortium:
We observed the field of the Fermi/GBM long GRB candidate GRB 211130A (Fermi GBM Team, GCN 31151) with the 0.6m wide-field MeerLICHT optical telescope located at Sutherland, South Africa, starting at 2021-11-30, 18:31:26 UT, approximately 3 hours 15 minutes after the GRB trigger. With a field of view of 2.7 square degrees, 72 MeerLICHT pointings were required to cover the GBM sky map to a probability level of 90%. We observed 67 out of the 72 fields three times on the first night of observations. The remaining 5 fields were observed once. All observations were conducted in the q-band (g+r) with a 60s exposure time. The average 5-sigma full-frame limiting magnitude was q = 20.79 across the observations.
Following the IPN triangulation of GRB 211130A (Kozyrev et al., GCN 31161), a refined search for transient candidates in our data reveals a single promising afterglow candidate at coordinates:
```
RA (J2000) = 01:24:52.46 (21.2186d)
Dec (J2000) = -27:41:57.48 (-27.6993d)
```
calibrated against Gaia DR2. The candidate is, however, located just North of the IPN triangulation region, an angular distance of 8.7' from the centre of the IPN region and still consistent with the Konus-Wind/GBM triangulation region. The candidate was detected at three epochs and appears to show fading behaviour, with 5-sigma AB magnitudes at time post-trigger of:
```
q = 19.83 +/- 0.07 at 3.74 hours
q = 20.05 +/- 0.10 at 5.57 hours
q = 20.66 +/- 0.20 at 7.05 hours.
```
No underlying source is visible in PanSTARRS and Legacy Survey DR9 images at this position.
MeerLICHT is built and run by a consortium consisting of Radboud University, University of Cape Town, the South African Astronomical Observatory, the University of Oxford, the University of Manchester and the University of Amsterdam.

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Jochen Greiner, last update: 10-Dec-2021 [Disclaimer]