Gamma-ray Burst 211129A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 29 Nov 21 09:51:22 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1085430,   Seg_Num: 0
GRB_RA:          274.557d {+18h 18m 14s} (J2000),
                 274.762d {+18h 19m 03s} (current),
                 274.088d {+18h 16m 21s} (1950)
GRB_DEC:         +31.776d {+31d 46' 33"} (J2000),
                 +31.786d {+31d 47' 09"} (current),
                 +31.755d {+31d 45' 18"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       3111 [cnts]    Image_Peak=197 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       16276 [cnts]
BKG_TIME:        35451.83 SOD {09:50:51.83} UT
BKG_DUR:         8 [sec]
GRB_DATE:        19547 TJD;   333 DOY;   21/11/29
GRB_TIME:        35466.23 SOD {09:51:06.23} UT
GRB_PHI:         -39.34 [deg]
GRB_THETA:        21.66 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     21.16 [sigma]
IMAGE_SIGNIF:    9.20 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +0  +0  +0 -49  +0 
SUN_POSTN:       245.59d {+16h 22m 23s}  -21.54d {-21d 32' 28"}
SUN_DIST:         60.20 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      182.30d {+12h 09m 12s}   +4.00d {+03d 59' 53"}
MOON_DIST:        89.98 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       59.06, 20.45 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      276.78, 55.11 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 99.75,14.24 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(0.0<100sec) coincident with the FERMI_GBM event (trignum=659872271).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 29 Nov 21 09:51:09 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      46
TRIGGER_NUM:     659872271
GRB_RA:          290.067d {+19h 20m 16s} (J2000),
                 290.288d {+19h 21m 09s} (current),
                 289.561d {+19h 18m 15s} (1950)
GRB_DEC:         +27.283d {+27d 16' 60"} (J2000),
                 +27.325d {+27d 19' 31"} (current),
                 +27.189d {+27d 11' 20"} (1950)
GRB_ERROR:       26.72 [deg radius, statistical plus systematic]
GRB_INTEN:       121 [cnts/sec]
DATA_SIGNIF:     6.30 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        19547 TJD;   333 DOY;   21/11/29
GRB_TIME:        35466.36 SOD {09:51:06.36} UT
GRB_PHI:          60.00 [deg]
GRB_THETA:        30.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      1.25
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      94%  GRB
2nd_MOST_LIKELY:   2%  Solar Flare
DETECTORS:       1,1,1, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       245.59d {+16h 22m 23s}  -21.54d {-21d 32' 28"}
SUN_DIST:         65.24 [deg]   Sun_angle= -3.0 [hr] (East of Sun)
MOON_POSTN:      182.30d {+12h 09m 12s}   +4.00d {+03d 59' 56"}
MOON_DIST:       103.99 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       60.42,  6.30 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      297.59, 48.82 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211129410/quicklook/glg_lc_medres34_bn211129410.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 25.80,12.82 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 29 Nov 21 09:51:27 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     659872271
GRB_RA:          270.150d {+18h 00m 36s} (J2000),
                 270.337d {+18h 01m 21s} (current),
                 269.723d {+17h 58m 54s} (1950)
GRB_DEC:         +37.510d {+37d 30' 36"} (J2000),
                 +37.511d {+37d 30' 38"} (current),
                 +37.510d {+37d 30' 37"} (1950)
GRB_ERROR:       8.53 [deg radius, statistical only]
DATA_SIGNIF:     9.00 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        19547 TJD;   333 DOY;   21/11/29
GRB_TIME:        35466.36 SOD {09:51:06.36} UT
GRB_PHI:          22.00 [deg]
GRB_THETA:        16.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       245.59d {+16h 22m 23s}  -21.54d {-21d 32' 28"}
SUN_DIST:         63.48 [deg]   Sun_angle= -1.6 [hr] (East of Sun)
MOON_POSTN:      182.30d {+12h 09m 12s}   +4.00d {+03d 59' 51"}
MOON_DIST:        86.01 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       63.79, 25.66 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      270.25, 60.95 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211129410/quicklook/glg_lc_medres34_bn211129410.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_659872271.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
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(0.0<100sec) coincident with the SWIFT_BAT event (trignum=1085430).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 29 Nov 21 09:52:27 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      0
TRIGGER_NUM:     659872271
GRB_RA:          271.360d {+18h 05m 26s} (J2000),
                 271.590d {+18h 06m 22s} (current),
                 270.835d {+18h 03m 20s} (1950)
GRB_DEC:         +22.600d {+22d 36' 00"} (J2000),
                 +22.603d {+22d 36' 11"} (current),
                 +22.595d {+22d 35' 41"} (1950)
GRB_ERROR:       7.28 [deg radius, statistical only]
DATA_SIGNIF:     9.70 [sigma]
DATA_INTERVAL:   10.240 [sec]
GRB_DATE:        19547 TJD;   333 DOY;   21/11/29
GRB_TIME:        35466.36 SOD {09:51:06.36} UT
GRB_PHI:          25.00 [deg]
GRB_THETA:        31.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       245.60d {+16h 22m 23s}  -21.54d {-21d 32' 28"}
SUN_DIST:         50.90 [deg]   Sun_angle= -1.7 [hr] (East of Sun)
MOON_POSTN:      182.31d {+12h 09m 14s}   +3.99d {+03d 59' 36"}
MOON_DIST:        87.80 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       48.85, 19.82 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      271.81, 46.03 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211129410/quicklook/glg_lc_medres34_bn211129410.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_659872271.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.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=1085430).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 29 Nov 21 09:52:56 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     1085430,   Seg_Num: 0
GRB_RA:          274.5834d {+18h 18m 20.0s} (J2000),
                 274.7888d {+18h 19m 09.3s} (current),
                 274.1149d {+18h 16m 27.5s} (1950)
GRB_DEC:         +31.7892d {+31d 47' 21.1"} (J2000),
                 +31.7992d {+31d 47' 56.9"} (current),
                 +31.7681d {+31d 46' 05.1"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       60 [cnts]
IMG_START_DATE:  19547 TJD;   333 DOY;   21/11/29
IMG_START_TIME:  35539.73 SOD {09:52:19.73} UT,   73.5 [sec] since BAT Trigger Time
CENTROID_X:      343.91,  raw= 344  [pixels]
CENTROID_Y:      324.03,  raw= 324  [pixels]
ROLL:            211.32 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   61.14
GRB_POS_XRT_Z:   86.07
IMAGE_URL:       sw01085430000msxps_rw.img
SUN_POSTN:       245.60d {+16h 22m 23s}  -21.54d {-21d 32' 28"}
SUN_DIST:         60.22 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      182.31d {+12h 09m 15s}   +3.99d {+03d 59' 29"}
MOON_DIST:        90.00 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       59.09, 20.43 [deg] galactic lon,lat of the burst
ECL_COORDS:      276.82, 55.12 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 29 Nov 21 09:52:53 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     1085430,   Seg_Num: 0
GRB_RA:          274.5834d {+18h 18m 20.0s} (J2000),
                 274.7888d {+18h 19m 09.3s} (current),
                 274.1149d {+18h 16m 27.5s} (1950)
GRB_DEC:         +31.7892d {+31d 47' 21.1"} (J2000),
                 +31.7992d {+31d 47' 56.9"} (current),
                 +31.7681d {+31d 46' 05.1"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       60 [cnts]
IMG_START_DATE:  19547 TJD;   333 DOY;   21/11/29
IMG_START_TIME:  35539.73 SOD {09:52:19.73} UT,   73.5 [sec] since BAT Trigger Time
CENTROID_X:      343.91,  raw= 344  [pixels]
CENTROID_Y:      324.03,  raw= 324  [pixels]
ROLL:            211.32 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   61.14
GRB_POS_XRT_Z:   86.07
IMAGE_URL:       sw01085430000msxps_rw.img
SUN_POSTN:       245.60d {+16h 22m 23s}  -21.54d {-21d 32' 28"}
SUN_DIST:         60.22 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      182.31d {+12h 09m 15s}   +3.99d {+03d 59' 30"}
MOON_DIST:        90.00 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       59.09, 20.43 [deg] galactic lon,lat of the burst
ECL_COORDS:      276.82, 55.12 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 29 Nov 21 09:52:45 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     1085430,   Seg_Num: 0
GRB_RA:          274.5834d {+18h 18m 20.01s} (J2000),
                 274.7888d {+18h 19m 09.30s} (current),
                 274.1149d {+18h 16m 27.56s} (1950)
GRB_DEC:         +31.7892d {+31d 47' 21.1"} (J2000),
                 +31.7992d {+31d 47' 56.9"} (current),
                 +31.7681d {+31d 46' 05.1"} (1950)
GRB_ERROR:       5.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.41e-09 [erg/cm2/sec]
GRB_SIGNIF:      7.74 [sigma]
IMG_START_DATE:  19547 TJD;   333 DOY;   21/11/29
IMG_START_TIME:  35539.73 SOD {09:52:19.73} UT,   73.5 [sec] since BAT Trigger Time
TAM[0-3]:        327.60 237.17 261.55 243.63
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       245.60d {+16h 22m 23s}  -21.54d {-21d 32' 28"}
SUN_DIST:         60.22 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      182.31d {+12h 09m 15s}   +3.99d {+03d 59' 32"}
MOON_DIST:        90.00 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       59.09, 20.43 [deg] galactic lon,lat of the burst
ECL_COORDS:      276.82, 55.12 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.57 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 29 Nov 21 09:55:19 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1085430,   Seg_Num: 0
POINT_RA:        274.552d {+18h 18m 13s} (J2000)
POINT_DEC:       +31.777d {+31d 46' 38"} (J2000)
POINT_ROLL:      211.320d
IMG_START_DATE:  19547 TJD;   333 DOY;   21/11/29
IMG_START_TIME:  35550.14 SOD {09:52:30.14} UT,   83.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.261
N_STARS:         140
X_OFFSET:        277 [pixels]
Y_OFFSET:        538 [pixels]
X_MAX:           1236 [pixels]
Y_MAX:           1497 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw01085430000msufc0083.fits
SUN_POSTN:       245.60d {+16h 22m 23s}  -21.54d {-21d 32' 29"}
SUN_DIST:         60.20 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      182.33d {+12h 09m 20s}   +3.98d {+03d 58' 53"}
MOON_DIST:        89.96 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       59.06, 20.45 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      276.77, 55.11 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 29 Nov 21 09:55:30 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1085430,   Seg_Num: 0
POINT_RA:        274.552d {+18h 18m 13s} (J2000)
POINT_DEC:       +31.777d {+31d 46' 38"} (J2000)
POINT_ROLL:      211.320d
IMG_START_DATE:  19547 TJD;   333 DOY;   21/11/29
IMG_START_TIME:  35550.14 SOD {09:52:30.14} UT,   83.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.261
N_STARS:         140
X_OFFSET:        277 [pixels]
Y_OFFSET:        538 [pixels]
X_MAX:           1236 [pixels]
Y_MAX:           1497 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw01085430000msufc0083.fits
SUN_POSTN:       245.60d {+16h 22m 23s}  -21.54d {-21d 32' 29"}
SUN_DIST:         60.20 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      182.34d {+12h 09m 21s}   +3.98d {+03d 58' 50"}
MOON_DIST:        89.96 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       59.06, 20.45 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      276.77, 55.11 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #31136
J.D. Gropp (PSU), S. D. Barthelmy (GSFC), P. A. Evans (U Leicester), N. J. Klingler (GSFC/UMBC/CRESSTII), K. L. Page (U Leicester) and B. Sbarufatti (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 09:51:06 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 211129A (trigger=1085430). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 274.557, +31.776 which is
```
   RA(J2000)  =  18h 18m 14s
   Dec(J2000) = +31d 46' 33"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows 3 major peaks with a duration of about 200 sec. The peak count rate was ~1400 counts/sec (15-350 keV), at ~3 sec after the trigger.
The XRT began observing the field at 09:52:19.7 UT, 73.5 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 274.58129, 31.78820 which is equivalent to:
```
  RA(J2000)  = 18h 18m 19.51s
  Dec(J2000) = +31d 47' 17.5"
```
with an uncertainty of 4.0 arcseconds (radius, 90% containment). This location is 86 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at https://www.swift.ac.uk/sper/1085430. We cannot determine whether the source is fading at the present time. No spectrum from the promptly downlinked event data is yet available to determine the column density.
The initial flux in the 2.5 s image was 1.41e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 83 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.082.
Burst Advocate for this burst is J.D. Gropp (jdg44 AT psu.edu). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 29 Nov 21 10:03:03 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1085430,   Seg_Num: 0
POINT_RA:        274.554d {+18h 18m 13s} (J2000)
POINT_DEC:       +31.777d {+31d 46' 39"} (J2000)
POINT_ROLL:      211.322d
IMG_START_DATE:  19547 TJD;   333 DOY;   21/11/29
IMG_START_TIME:  35762.83 SOD {09:56:02.83} UT,   296.6 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.590
N_STARS:         95
X_OFFSET:        277 [pixels]
Y_OFFSET:        538 [pixels]
X_MAX:           1236 [pixels]
Y_MAX:           1497 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw01085430000msufc0296.fits
SUN_POSTN:       245.60d {+16h 22m 25s}  -21.54d {-21d 32' 32"}
SUN_DIST:         60.20 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      182.40d {+12h 09m 36s}   +3.95d {+03d 56' 56"}
MOON_DIST:        89.92 [deg]
MOON_ILLUM:      30 [%]
GAL_COORDS:       59.06, 20.45 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      276.78, 55.11 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 29 Nov 21 10:04:25 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1085430,   Seg_Num: 0
POINT_RA:        274.554d {+18h 18m 13s} (J2000)
POINT_DEC:       +31.777d {+31d 46' 39"} (J2000)
ROLL:            211.322d
IMG_START_DATE:  19547 TJD;   333 DOY;   21/11/29
IMG_START_TIME:  35762.83 SOD {09:56:02.83} UT,   296.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     659872591
X_OFFSET:        597 [pixels]
Y_OFFSET:        858 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       757
Y_GRB_POS:       1018
BINNING_INDEX:   1
IM_URL:          sw01085430000msuni0325.fits
SUN_POSTN:       245.60d {+16h 22m 25s}  -21.54d {-21d 32' 33"}
SUN_DIST:         60.20 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      182.41d {+12h 09m 39s}   +3.94d {+03d 56' 36"}
MOON_DIST:        89.91 [deg]
MOON_ILLUM:      30 [%]
GAL_COORDS:       59.06, 20.45 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      276.78, 55.11 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 29 Nov 21 09:56:48 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1085430,   Seg_Num: 0
POINT_RA:        274.552d {+18h 18m 13s} (J2000)
POINT_DEC:       +31.777d {+31d 46' 38"} (J2000)
ROLL:            211.320d
IMG_START_DATE:  19547 TJD;   333 DOY;   21/11/29
IMG_START_TIME:  35550.14 SOD {09:52:30.14} UT,   83.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     659872378
X_OFFSET:        597 [pixels]
Y_OFFSET:        858 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       757
Y_GRB_POS:       1018
BINNING_INDEX:   1
IM_URL:          sw01085430000msuni0112.fits
SUN_POSTN:       245.60d {+16h 22m 24s}  -21.54d {-21d 32' 30"}
SUN_DIST:         60.20 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      182.35d {+12h 09m 23s}   +3.98d {+03d 58' 31"}
MOON_DIST:        89.95 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       59.06, 20.45 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      276.77, 55.11 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 29 Nov 21 09:56:54 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1085430,   Seg_Num: 0
GRB_RA:          274.557d {+18h 18m 14s} (J2000),
                 274.762d {+18h 19m 03s} (current),
                 274.088d {+18h 16m 21s} (1950)
GRB_DEC:         +31.776d {+31d 46' 33"} (J2000),
                 +31.786d {+31d 47' 09"} (current),
                 +31.755d {+31d 45' 18"} (1950)
GRB_DATE:        19547 TJD;   333 DOY;   21/11/29
GRB_TIME:        35466.23 SOD {09:51:06.23} UT
TRIGGER_INDEX:   146
GRB_PHI:         -39.34 [deg]
GRB_THETA:        21.66 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     21.16 [sigma]
IMAGE_SIGNIF:    9.20 [sigma]
LC_URL:          sw01085430000msb.lc
SUN_POSTN:       245.60d {+16h 22m 24s}  -21.54d {-21d 32' 30"}
SUN_DIST:         60.20 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      182.35d {+12h 09m 24s}   +3.97d {+03d 58' 29"}
MOON_DIST:        89.95 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       59.06, 20.45 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      276.78, 55.11 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 99.75,14.24 [deg].

GCN Circular #31137
R. Yamaguchi, R. Hosokawa, Y. Imai, K. L. Murata, M. Niwano, Y. Takamatsu, N. Ito, R. Noto, S. Sato, M. Takaku, Y. Yatsu, and N. Kawai (TokyoTech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 211129A(J.D. Gropp et al. GCN Circular #31136) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope Akeno. The observation with a series of 10 sec exposures started at 2021-11-29 09:52:06 UT (60 seconds after Swift trigger). We stacked the images with good conditions. We did not detect any uncatalogued sources within the XRT error region (J.D. Gropp et al. GCN Circular #31136). We obtained the 5-sigma limits of the stacked images as follows.
```
T0+[sec] MID-UT T-EXP[sec] 5-sigma limits
------------------------------------------------------------------------------------------------
159 2021-11-29 09:53:45 70 g'>17.0, Rc>17.3, Ic>16.4
------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
```
We used PS1 catalog for flux calibration. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al. 2021, PASJ, Vol.73, Issue 1, Pages 4-24; https://github.com/MNiwano/Eclaire).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 29 Nov 21 09:57:01 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1085430,   Seg_Num: 0
POINT_RA:        274.552d {+18h 18m 13s} (J2000)
POINT_DEC:       +31.777d {+31d 46' 38"} (J2000)
ROLL:            211.320d
IMG_START_DATE:  19547 TJD;   333 DOY;   21/11/29
IMG_START_TIME:  35550.14 SOD {09:52:30.14} UT,   83.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     659872378
X_OFFSET:        597 [pixels]
Y_OFFSET:        858 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       757
Y_GRB_POS:       1018
BINNING_INDEX:   1
IM_URL:          sw01085430000msuni0112.fits
SUN_POSTN:       245.60d {+16h 22m 24s}  -21.54d {-21d 32' 30"}
SUN_DIST:         60.20 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      182.35d {+12h 09m 24s}   +3.97d {+03d 58' 27"}
MOON_DIST:        89.95 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:       59.06, 20.45 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      276.77, 55.11 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 29 Nov 21 10:04:33 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1085430,   Seg_Num: 0
POINT_RA:        274.554d {+18h 18m 13s} (J2000)
POINT_DEC:       +31.777d {+31d 46' 39"} (J2000)
ROLL:            211.322d
IMG_START_DATE:  19547 TJD;   333 DOY;   21/11/29
IMG_START_TIME:  35762.83 SOD {09:56:02.83} UT,   296.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     659872591
X_OFFSET:        597 [pixels]
Y_OFFSET:        858 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       757
Y_GRB_POS:       1018
BINNING_INDEX:   1
IM_URL:          sw01085430000msuni0325.fits
SUN_POSTN:       245.60d {+16h 22m 25s}  -21.54d {-21d 32' 33"}
SUN_DIST:         60.20 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      182.41d {+12h 09m 39s}   +3.94d {+03d 56' 34"}
MOON_DIST:        89.91 [deg]
MOON_ILLUM:      30 [%]
GAL_COORDS:       59.06, 20.45 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      276.78, 55.11 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 29 Nov 21 10:03:17 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1085430,   Seg_Num: 0
POINT_RA:        274.554d {+18h 18m 13s} (J2000)
POINT_DEC:       +31.777d {+31d 46' 39"} (J2000)
POINT_ROLL:      211.322d
IMG_START_DATE:  19547 TJD;   333 DOY;   21/11/29
IMG_START_TIME:  35762.83 SOD {09:56:02.83} UT,   296.6 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.590
N_STARS:         95
X_OFFSET:        277 [pixels]
Y_OFFSET:        538 [pixels]
X_MAX:           1236 [pixels]
Y_MAX:           1497 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw01085430000msufc0296.fits
SUN_POSTN:       245.60d {+16h 22m 25s}  -21.54d {-21d 32' 33"}
SUN_DIST:         60.20 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
MOON_POSTN:      182.40d {+12h 09m 37s}   +3.95d {+03d 56' 53"}
MOON_DIST:        89.92 [deg]
MOON_ILLUM:      30 [%]
GAL_COORDS:       59.06, 20.45 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      276.78, 55.11 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #31139
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 1213 s of XRT Photon Counting mode data and 3 UVOT images for GRB 211129A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 274.58031, +31.78886 which is equivalent to:
```
RA (J2000): 18h 18m 19.27s
Dec (J2000): +31d 47' 19.9"
```
with an uncertainty of 2.1 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #31140
Z.P. Zhu (NAOC, HUST), X. Liu, S.Y. Fu, S.Q. Jiang, D. Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:
We observed the field of Swift GRB 211129A (Gropp et al. GCN Circ. 31136) using the NEXT-0.6m telescope located at Nanshan, Xinjiang, China. We obtained 18x120 s frames in the Sloan r-band, starting at 12:38:57 UT on 2021-11-29, i.e., 2.8 hr after the BAT trigger.
No optical source is detected at the Enhanced Swift/XRT position (Goad et al. GCN Circ. 31139) in our stacked image, down to a limiting magnitude of r~21.2, calibrated with the nearby PanSTARRS field.
GCN Circular #31141
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) was pointed to the Swift GRB 211129A ( J.D. Gropp et al., GCN 31136) errorbox 17290 sec after notice time and 17308 sec after trigger time at 2021-11-29 14:39:34 UT, with upper limit up to 16.0 mag. Observations started at twilight. The observations began at zenith distance = 45 deg. The sun altitude is -11.1 deg.
The galactic latitude b = 20 deg., longitude l = 59 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1799491
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

   17399 |   MASTER-Kislovodsk |   C |   180 | 16.0 |        
   17399 |   MASTER-Kislovodsk |   C |   180 | 12.8 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #31142
E. Bissaldi (Politecnico and INFN Bari) reports on behalf of the Fermi GBM Team:
"At 09:51:06.36 UT on 29 November 2021, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 211129A (trigger 659872271 / 211129410), which was also detected by the Swift/BAT (Gropp et al. 2021, GCN 31136). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 22 degrees.
The GBM light curve consists of multiple peaks with a duration (T90) of about 111 s (50-300 keV). The time-averaged spectrum from T0-8 s to T0+41 s is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is -1.54 +/- 0.09 and the cutoff energy, parameterized as Epeak, is 220 +/- 90 keV.
The event fluence (10-1000 keV) in this time interval is (4.3 +/- 0.4)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+27 s in the 10-1000 keV band is 2.81 +/- 0.22 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 #31147
A. Belles (PSU) and J. D. Gropp (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 211129A 84 s after the BAT trigger (Gropp et al., GCN Circ. 31136). No optical afterglow consistent with the XRT position (Goad et al. GCN Circ. 31139) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC            84          234          147         >20.7
u_FC               297          547          246         >20.4
white               84          769          186         >20.9
v                  626          818           39         >18.8
b                  552          744           39         >19.6
u                  297          719          265         >20.5
w1                 675          695           19         >19.6
m2                 651          831           28         >19.2
w2                 602          794           39         >20.1
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.081 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #31148
J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), T. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB), B. Sbarufatti (PSU) and J.D. Gropp report on behalf of the Swift-XRT team:
We have analysed 6.2 ks of XRT data for GRB 211129A (Gropp et al. GCN Circ. 31136), from 62 s to 50.9 ks after the BAT trigger. The data comprise 325 s in Windowed Timing (WT) mode (the first 9 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 31139).
The late-time light curve (from T0+4.5 ks) can be modelled with a power-law decay with a decay index of alpha=1.02 (+/-0.08).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.63 (+/-0.05). The best-fitting absorption column is 4.8 (+/-0.3) x 10^21 cm^-2, in excess of the Galactic value of 8.8 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.30 (+0.16, -0.15) and a best-fitting absorption column of 5.9 (+0.9, -0.8) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.6 x 10^-11 (7.5 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     5.9 (+0.9, -0.8) x 10^21 cm^-2
Galactic foreground: 8.8 x 10^20 cm^-2
Excess significance: 10.1 sigma
Photon index:	     2.30 (+0.16, -0.15)
```
If the light curve continues to decay with a power-law decay index of 1.02, the count rate at T+24 hours will be 0.038 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.4 x 10^-12 (2.9 x 10^-12) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01085430.
This circular is an official product of the Swift-XRT team.
GCN Circular #31149
D. M. Palmer (LANL), S. D. Barthelmy (GSFC), J. D. Gropp (PSU), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), T. Parsotan (GSFC/UMBC), T. Sakamoto (AGU), M. Stamatikos (OSU) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+800 sec from the recent telemetry downlink, we report further analysis of BAT GRB 211129A (trigger #1085430) (Gropp et al., GCN Circ. 31136). The BAT ground-calculated position is RA, Dec = 274.565, 31.781 deg which is
```
   RA(J2000)  =  18h 18m 15.6s
   Dec(J2000) = +31d 46' 51.5"
```
with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 83%.
The mask-weighted light curve shows a multi-peaked structure that starts at ~T-2 s and ends at ~T+120 s. The three main peaks occur at ~T+1 s, ~T+29 s, and ~T+91 s, respectively. T90 (15-350 keV) is 113.01 +- 9.14 sec (estimated error including systematics).
The time-averaged spectrum from T-1.80 to T+124.11 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.75 +- 0.13. The fluence in the 15-150 keV band is 2.3 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.99 sec in the 15-150 keV band is 1.5 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/1085430/BA/

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Jochen Greiner, last update: 30-Nov-2021 [Disclaimer]