Gamma-ray Burst 231104A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 04 Nov 23 01:47:56 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1194500,   Seg_Num: 0
GRB_RA:           23.789d {+01h 35m 09s} (J2000),
                  24.599d {+01h 38m 24s} (current),
                  22.171d {+01h 28m 41s} (1950)
GRB_DEC:         +83.791d {+83d 47' 27"} (J2000),
                 +83.912d {+83d 54' 43"} (current),
                 +83.534d {+83d 32' 04"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       20514 [cnts]    Image_Peak=2957 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   155     E_range: 50-350 keV
BKG_INTEN:       15252 [cnts]
BKG_TIME:        6447.69 SOD {01:47:27.69} UT
BKG_DUR:         8 [sec]
GRB_DATE:        20252 TJD;   308 DOY;   23/11/04
GRB_TIME:        6459.91 SOD {01:47:39.91} UT
GRB_PHI:         -43.31 [deg]
GRB_THETA:        20.13 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     255.99 [sigma]
IMAGE_SIGNIF:    23.70 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +3  +8  +0  +0 +36  +0 
SUN_POSTN:       218.95d {+14h 35m 47s}  -15.24d {-15d 14' 31"}
SUN_DIST:        111.13 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:      120.46d {+08h 01m 51s}  +25.87d {+25d 52' 14"}
MOON_DIST:        64.90 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      124.19, 21.03 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       77.20, 63.48 [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 = 318.41,12.39 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(11.0<100sec) coincident with the FERMI_GBM event (trignum=720755253).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 04 Nov 23 01:48:00 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      48
TRIGGER_NUM:     720755253
GRB_RA:          136.450d {+09h 05m 48s} (J2000),
                 139.147d {+09h 16m 35s} (current),
                 129.989d {+08h 39m 57s} (1950)
GRB_DEC:         +87.917d {+87d 55' 00"} (J2000),
                 +87.818d {+87d 49' 06"} (current),
                 +88.108d {+88d 06' 30"} (1950)
GRB_ERROR:       22.18 [deg radius, statistical plus systematic]
GRB_INTEN:       68 [cnts/sec]
DATA_SIGNIF:     4.90 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        20252 TJD;   308 DOY;   23/11/04
GRB_TIME:        6448.14 SOD {01:47:28.14} UT
GRB_PHI:          96.00 [deg]
GRB_THETA:        25.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.00
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:     100%  Unreliable location
2nd_MOST_LIKELY:   0%  n/a
DETECTORS:       0,1,0, 0,0,0, 0,0,0, 1,0,0, 0,0,
SUN_POSTN:       218.95d {+14h 35m 47s}  -15.24d {-15d 14' 31"}
SUN_DIST:        104.85 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:      120.47d {+08h 01m 52s}  +25.87d {+25d 52' 14"}
MOON_DIST:        62.06 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      124.90, 28.27 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       93.59, 65.08 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231104075/quicklook/glg_lc_medres34_bn231104075.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 26.38,18.15 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(11.0<100sec) coincident with the SWIFT_BAT event (trignum=1194500).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 04 Nov 23 01:48:07 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      59
TRIGGER_NUM:     720755253
GRB_RA:           20.950d {+01h 23m 48s} (J2000),
                  21.670d {+01h 26m 41s} (current),
                  19.507d {+01h 18m 02s} (1950)
GRB_DEC:         +83.300d {+83d 17' 60"} (J2000),
                 +83.424d {+83d 25' 25"} (current),
                 +83.039d {+83d 02' 19"} (1950)
GRB_ERROR:       4.52 [deg radius, statistical plus systematic]
GRB_INTEN:       790 [cnts/sec]
DATA_SIGNIF:     26.50 [sigma]
INTEG_TIME:      0.512 [sec]
GRB_DATE:        20252 TJD;   308 DOY;   23/11/04
GRB_TIME:        6448.14 SOD {01:47:28.14} UT
GRB_PHI:         110.00 [deg]
GRB_THETA:        30.00 [deg]
DATA_TIME_SCALE: 0.5120 [sec]
HARD_RATIO:      0.57
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,1,0, 0,0,0, 0,0,0, 1,0,0, 0,0,
SUN_POSTN:       218.95d {+14h 35m 47s}  -15.24d {-15d 14' 32"}
SUN_DIST:        111.51 [deg]   Sun_angle= -10.8 [hr] (East of Sun)
MOON_POSTN:      120.47d {+08h 01m 52s}  +25.87d {+25d 52' 13"}
MOON_DIST:        65.31 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      123.94, 20.49 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       75.89, 63.46 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231104075/quicklook/glg_lc_medres34_bn231104075.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 26.38,18.15 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(11.0<100sec) coincident with the SWIFT_BAT event (trignum=1194500).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 04 Nov 23 01:48:17 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     720755253
GRB_RA:          350.880d {+23h 23m 31s} (J2000),
                 351.144d {+23h 24m 35s} (current),
                 350.329d {+23h 21m 19s} (1950)
GRB_DEC:         +63.250d {+63d 15' 00"} (J2000),
                 +63.381d {+63d 22' 52"} (current),
                 +62.975d {+62d 58' 31"} (1950)
GRB_ERROR:       13.08 [deg radius, statistical only]
DATA_SIGNIF:     6.60 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        20252 TJD;   308 DOY;   23/11/04
GRB_TIME:        6448.14 SOD {01:47:28.14} UT
GRB_PHI:         120.00 [deg]
GRB_THETA:        50.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       218.95d {+14h 35m 47s}  -15.24d {-15d 14' 32"}
SUN_DIST:        121.70 [deg]   Sun_angle= -8.8 [hr] (East of Sun)
MOON_POSTN:      120.47d {+08h 01m 52s}  +25.87d {+25d 52' 12"}
MOON_DIST:        82.26 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      113.23,  2.05 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       33.10, 57.96 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231104075/quicklook/glg_lc_medres34_bn231104075.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_720755253.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(11.0<100sec) coincident with the SWIFT_BAT event (trignum=1194500).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 04 Nov 23 01:48:18 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      71
TRIGGER_NUM:     720755253
GRB_RA:          339.850d {+22h 39m 24s} (J2000),
                 339.850d {+22h 39m 24s} (current),
                 339.836d {+22h 39m 21s} (1950)
GRB_DEC:         +81.433d {+81d 25' 60"} (J2000),
                 +81.558d {+81d 33' 28"} (current),
                 +81.172d {+81d 10' 19"} (1950)
GRB_ERROR:       3.78 [deg radius, statistical plus systematic]
GRB_INTEN:       1960 [cnts/sec]
DATA_SIGNIF:     197.20 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        20252 TJD;   308 DOY;   23/11/04
GRB_TIME:        6448.14 SOD {01:47:28.14} UT
GRB_PHI:         105.00 [deg]
GRB_THETA:        35.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.42
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,1,0, 0,0,0, 0,0,0, 1,0,0, 0,0,
SUN_POSTN:       218.95d {+14h 35m 47s}  -15.24d {-15d 14' 32"}
SUN_DIST:        109.44 [deg]   Sun_angle= -8.1 [hr] (East of Sun)
MOON_POSTN:      120.47d {+08h 01m 52s}  +25.87d {+25d 52' 12"}
MOON_DIST:        70.76 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      117.98, 19.86 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       68.01, 68.07 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231104075/quicklook/glg_lc_medres34_bn231104075.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 26.38,18.15 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(11.0<100sec) coincident with the SWIFT_BAT event (trignum=1194500).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 04 Nov 23 01:56:47 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     720755253
GRB_RA:            8.040d {+00h 32m 10s} (J2000),
                   8.484d {+00h 33m 56s} (current),
                   7.140d {+00h 28m 34s} (1950)
GRB_DEC:         +82.080d {+82d 04' 48"} (J2000),
                 +82.211d {+82d 12' 41"} (current),
                 +81.804d {+81d 48' 15"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
GRB_DATE:        20252 TJD;   308 DOY;   23/11/04
GRB_TIME:        6448.14 SOD {01:47:28.14} UT
GRB_PHI:         110.00 [deg]
GRB_THETA:        32.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       218.95d {+14h 35m 49s}  -15.24d {-15d 14' 38"}
SUN_DIST:        111.91 [deg]   Sun_angle= -10.0 [hr] (East of Sun)
MOON_POSTN:      120.55d {+08h 02m 11s}  +25.86d {+25d 51' 19"}
MOON_DIST:        67.28 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      122.23, 19.23 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       71.66, 64.30 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231104075/quicklook/glg_lc_medres34_bn231104075.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231104075/quicklook/glg_locplot_all_bn231104075.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.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(11.0<100sec) coincident with the SWIFT_BAT event (trignum=1194500).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 04 Nov 23 01:49:15 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     1194500,   Seg_Num: 0
POINT_RA:         23.625d {+01h 34m 30s} (J2000)
POINT_DEC:       +83.774d {+83d 46' 26"} (J2000)
IMG_START_DATE:  20252 TJD;   308 DOY;   23/11/04
IMG_START_TIME:  6547.81 SOD {01:49:07.81} UT,   87.9 [sec] since BAT Trigger Time
COUNTS:          18    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        1    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 04 Nov 23 01:52:55 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     9944188,   Seg_Num: 54
GRB_RA:           23.789d {+01h 35m 09s} (J2000),
                  24.599d {+01h 38m 24s} (current),
                  22.171d {+01h 28m 41s} (1950)
GRB_DEC:         +83.791d {+83d 47' 27"} (J2000),
                 +83.912d {+83d 54' 43"} (current),
                 +83.534d {+83d 32' 04"} (1950)
GRB_DATE:        20252 TJD;   308 DOY;   23/11/04
GRB_TIME:        6459.91 SOD {01:47:39.91} UT
TRIGGER_INDEX:   155
GRB_PHI:         -43.31 [deg]
GRB_THETA:        20.13 [deg]
DELTA_TIME:      -1976.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    0.00 [sigma]
LC_URL:          sw01194500000msb.lc
SUN_POSTN:       218.95d {+14h 35m 48s}  -15.24d {-15d 14' 35"}
SUN_DIST:        111.14 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:      120.51d {+08h 02m 02s}  +25.86d {+25d 51' 43"}
MOON_DIST:        64.92 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      124.19, 21.03 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       77.20, 63.48 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        WARNING: No BAT_Position TDRSS message was received for this trigger_number!  
COMMENTS:           
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 318.41,12.39 [deg].  
COMMENTS:        The 3rd packet (of 3) was missing in the lightcurve data stream.

GCN Circular #34936
V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko, G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij (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. Gress, N.M. Budnev, O.Ershova (Irkutsk State University, API),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich (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) was pointed to the Swift GRB231104.07 (trigger No 1194500,01h 35m 09.36s , +83d 47m 27.6s, R=0.05) errorbox 15 sec after notice time and 35 sec after trigger time at 2023-11-04 01:48:15 UT, with upper limit up to 14.7 mag. The observations began at zenith distance = 45 deg. The sun altitude is -28.0 deg.
The galactic latitude b = 21 deg., longitude l = 124 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2294743
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

      40 |      MASTER-Tavrida |   C |    10 | 13.8 |        
      57 |      MASTER-Tavrida |   C |    10 | 13.8 |        
      75 |      MASTER-Tavrida |   C |    10 | 13.9 |        
      98 |      MASTER-Tavrida |   C |    20 | 14.5 |        
     125 |      MASTER-Tavrida |   C |    20 | 14.3 |        
     157 |      MASTER-Tavrida |   C |    30 | 14.6 |        
     200 |      MASTER-Tavrida |   C |    40 | 14.7 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #34937
The Fermi GBM team reports the detection of a likely LONG GRB
At 01:47:28 UT on 4 Nov 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231104A (trigger 720755253.13875 / 231104075).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 8.0, Dec = 82.1 (J2000 degrees, equivalent to J2000 00h 32m, 82d 05'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 32.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231104075/quicklook/glg_skymap_all_bn231104075.png
The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231104075/quicklook/glg_healpix_all_bn231104075.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231104075/quicklook/glg_lc_medres34_bn231104075.gif

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 04 Nov 23 02:00:43 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1194500,   Seg_Num: 0
POINT_RA:         23.619d {+01h 34m 28s} (J2000)
POINT_DEC:       +83.773d {+83d 46' 23"} (J2000)
POINT_ROLL:      344.116d
IMG_START_DATE:  20252 TJD;   308 DOY;   23/11/04
IMG_START_TIME:  6763.47 SOD {01:52:43.47} UT,   303.6 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.452
N_STARS:         190
X_OFFSET:        391 [pixels]
Y_OFFSET:        416 [pixels]
X_MAX:           1830 [pixels]
Y_MAX:           1855 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    3
SL_URL:          sw01194500000msufc0303.fits
SUN_POSTN:       218.96d {+14h 35m 49s}  -15.25d {-15d 14' 41"}
SUN_DIST:        111.15 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:      120.58d {+08h 02m 20s}  +25.85d {+25d 50' 54"}
MOON_DIST:        64.96 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      124.17, 21.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       77.14, 63.48 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 04 Nov 23 02:01:00 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1194500,   Seg_Num: 0
POINT_RA:         23.619d {+01h 34m 28s} (J2000)
POINT_DEC:       +83.773d {+83d 46' 23"} (J2000)
POINT_ROLL:      344.116d
IMG_START_DATE:  20252 TJD;   308 DOY;   23/11/04
IMG_START_TIME:  6763.47 SOD {01:52:43.47} UT,   303.6 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.452
N_STARS:         190
X_OFFSET:        391 [pixels]
Y_OFFSET:        416 [pixels]
X_MAX:           1830 [pixels]
Y_MAX:           1855 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    3
SL_URL:          sw01194500000msufc0303.fits
SUN_POSTN:       218.96d {+14h 35m 49s}  -15.25d {-15d 14' 42"}
SUN_DIST:        111.15 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:      120.58d {+08h 02m 20s}  +25.85d {+25d 50' 52"}
MOON_DIST:        64.96 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      124.17, 21.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       77.14, 63.48 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_srclist.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 04 Nov 23 02:01:49 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1194500,   Seg_Num: 0
POINT_RA:         23.619d {+01h 34m 28s} (J2000)
POINT_DEC:       +83.773d {+83d 46' 23"} (J2000)
ROLL:            344.116d
IMG_START_DATE:  20252 TJD;   308 DOY;   23/11/04
IMG_START_TIME:  6763.47 SOD {01:52:43.47} UT,   303.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     720755595
X_OFFSET:        950 [pixels]
Y_OFFSET:        975 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1110
Y_GRB_POS:       1135
BINNING_INDEX:   1
IM_URL:          sw01194500000msuni0336.fits
SUN_POSTN:       218.96d {+14h 35m 49s}  -15.25d {-15d 14' 42"}
SUN_DIST:        111.15 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:      120.59d {+08h 02m 22s}  +25.85d {+25d 50' 47"}
MOON_DIST:        64.96 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      124.17, 21.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       77.14, 63.48 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 04 Nov 23 02:02:04 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1194500,   Seg_Num: 0
POINT_RA:         23.619d {+01h 34m 28s} (J2000)
POINT_DEC:       +83.773d {+83d 46' 23"} (J2000)
ROLL:            344.116d
IMG_START_DATE:  20252 TJD;   308 DOY;   23/11/04
IMG_START_TIME:  6763.47 SOD {01:52:43.47} UT,   303.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     720755595
X_OFFSET:        950 [pixels]
Y_OFFSET:        975 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1110
Y_GRB_POS:       1135
BINNING_INDEX:   1
IM_URL:          sw01194500000msuni0336.fits
SUN_POSTN:       218.96d {+14h 35m 49s}  -15.25d {-15d 14' 42"}
SUN_DIST:        111.15 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:      120.59d {+08h 02m 23s}  +25.85d {+25d 50' 46"}
MOON_DIST:        64.96 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      124.17, 21.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       77.14, 63.48 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 04 Nov 23 02:08:11 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1194500,   Seg_Num: 0
POINT_RA:         23.620d {+01h 34m 29s} (J2000)
POINT_DEC:       +83.773d {+83d 46' 22"} (J2000)
POINT_ROLL:      344.117d
IMG_START_DATE:  20252 TJD;   308 DOY;   23/11/04
IMG_START_TIME:  7320.29 SOD {02:02:00.29} UT,   860.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.431
N_STARS:         190
X_OFFSET:        391 [pixels]
Y_OFFSET:        416 [pixels]
X_MAX:           1830 [pixels]
Y_MAX:           1855 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw01194500000msufc0860.fits
SUN_POSTN:       218.96d {+14h 35m 50s}  -15.25d {-15d 14' 47"}
SUN_DIST:        111.15 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:      120.65d {+08h 02m 36s}  +25.84d {+25d 50' 07"}
MOON_DIST:        64.98 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      124.18, 21.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       77.14, 63.48 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 04 Nov 23 02:08:30 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1194500,   Seg_Num: 0
POINT_RA:         23.620d {+01h 34m 29s} (J2000)
POINT_DEC:       +83.773d {+83d 46' 22"} (J2000)
POINT_ROLL:      344.117d
IMG_START_DATE:  20252 TJD;   308 DOY;   23/11/04
IMG_START_TIME:  7320.29 SOD {02:02:00.29} UT,   860.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.431
N_STARS:         190
X_OFFSET:        391 [pixels]
Y_OFFSET:        416 [pixels]
X_MAX:           1830 [pixels]
Y_MAX:           1855 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw01194500000msufc0860.fits
SUN_POSTN:       218.96d {+14h 35m 51s}  -15.25d {-15d 14' 47"}
SUN_DIST:        111.15 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:      120.65d {+08h 02m 37s}  +25.83d {+25d 50' 05"}
MOON_DIST:        64.98 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      124.18, 21.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       77.14, 63.48 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 04 Nov 23 02:10:10 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1194500,   Seg_Num: 0
POINT_RA:         23.620d {+01h 34m 29s} (J2000)
POINT_DEC:       +83.773d {+83d 46' 22"} (J2000)
ROLL:            344.117d
IMG_START_DATE:  20252 TJD;   308 DOY;   23/11/04
IMG_START_TIME:  7320.29 SOD {02:02:00.29} UT,   860.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     720756152
X_OFFSET:        950 [pixels]
Y_OFFSET:        975 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1110
Y_GRB_POS:       1135
BINNING_INDEX:   1
IM_URL:          sw01194500000msuni0893.fits
SUN_POSTN:       218.96d {+14h 35m 51s}  -15.25d {-15d 14' 49"}
SUN_DIST:        111.15 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:      120.67d {+08h 02m 40s}  +25.83d {+25d 49' 55"}
MOON_DIST:        64.99 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      124.18, 21.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       77.14, 63.48 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 04 Nov 23 02:10:19 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1194500,   Seg_Num: 0
POINT_RA:         23.620d {+01h 34m 29s} (J2000)
POINT_DEC:       +83.773d {+83d 46' 22"} (J2000)
ROLL:            344.117d
IMG_START_DATE:  20252 TJD;   308 DOY;   23/11/04
IMG_START_TIME:  7320.29 SOD {02:02:00.29} UT,   860.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     720756152
X_OFFSET:        950 [pixels]
Y_OFFSET:        975 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1110
Y_GRB_POS:       1135
BINNING_INDEX:   1
IM_URL:          sw01194500000msuni0893.fits
SUN_POSTN:       218.96d {+14h 35m 51s}  -15.25d {-15d 14' 49"}
SUN_DIST:        111.15 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:      120.67d {+08h 02m 41s}  +25.83d {+25d 49' 54"}
MOON_DIST:        64.99 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      124.18, 21.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       77.14, 63.48 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #34938
K. L. Page (U Leicester), J.D. Gropp (PSU), D. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 01:47:39 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 231104A (trigger=1194500). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 23.789, +83.791 which is
```
   RA(J2000) = 01h 35m 09s
   Dec(J2000) = +83d 47' 27"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The available BAT light curve (up to T+8s) showed a complex structure with a duration of at least 12 sec. The peak count rate was ~50,000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 01:49:10 UT, 90.2 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 23.8113, 83.7912 which is equivalent to:
```
   RA(J2000)  = 01h 35m 14.7s
   Dec(J2000) = +83d 47' 28"
```
with an uncertainty of 3.8 arcseconds (radius, 90% containment). This location is 9 arcseconds from the BAT onboard position. This position may be improved as more data are received; the latest position is available at https://www.swift.ac.uk/sper.
UVOT took a finding chart exposure of 150 seconds with the White filter starting 860 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 25% of the BAT 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 BAT 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 0.157.
Burst Advocate for this burst is K. L. Page (klp5 AT leicester.ac.uk). 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 Circular #34939
R. Strausbaugh (Eastern Illinois University), A. Cucchiara (NASA) report on behalf of a larger collaboration:
We observed the Fermi GRB 231104A field (Fermi GBM team, GCN 34937) with the LCOGT 1-meter Sinistro instrument at the McDonald Observatory, USA site, on November 4, from 02:53 to 03:25 UT (corresponding to 1.10 to 1.63 hours from the GRB trigger time) with the SDSS r and i filters.
We performed a series of 3x300s exposures in each band. We do not detect a source within the Swift-XRT error region around the candidate X-ray source (Page et al., GCN 34938) in either band.
The following 5-sigma upper limits are calculated using the PanSTARRS catalog as reference:
```
r > 22.6
i > 21.8
```
These magnitudes are not corrected for galactic extinction.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 04 Nov 23 07:45:53 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     1194500,   Seg_Num: 0
GRB_RA:           23.8081d {+01h 35m 13.94s} (J2000),
                  24.6189d {+01h 38m 28.53s} (current),
                  22.1890d {+01h 28m 45.36s} (1950)
GRB_DEC:         +83.7925d {+83d 47' 33.0"} (J2000),
                 +83.9136d {+83d 54' 48.7"} (current),
                 +83.5362d {+83d 32' 10.2"} (1950)
GRB_ERROR:       3.5 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  20252 TJD;   308 DOY;   23/11/04
IMG_START_TIME:  6703.00 SOD {01:51:43.00} UT,   243.1 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       219.19d {+14h 36m 46s}  -15.32d {-15d 19' 08"}
SUN_DIST:        111.20 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:      123.72d {+08h 14m 53s}  +25.21d {+25d 12' 53"}
MOON_DIST:        65.89 [deg]
MOON_ILLUM:      60 [%]
GAL_COORDS:      124.19, 21.03 [deg] galactic lon,lat of the burst
ECL_COORDS:       77.20, 63.48 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 04 Nov 23 07:45:42 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     1194500,   Seg_Num: 0
GRB_RA:           23.8012d {+01h 35m 12.28s} (J2000),
                  24.6119d {+01h 38m 26.86s} (current),
                  22.1822d {+01h 28m 43.73s} (1950)
GRB_DEC:         +83.7935d {+83d 47' 36.5"} (J2000),
                 +83.9146d {+83d 54' 52.4"} (current),
                 +83.5372d {+83d 32' 13.7"} (1950)
GRB_ERROR:       1.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  20252 TJD;   308 DOY;   23/11/04
IMG_START_TIME:  6703.00 SOD {01:51:43.00} UT,   243.1 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       219.19d {+14h 36m 46s}  -15.32d {-15d 19' 08"}
SUN_DIST:        111.20 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:      123.72d {+08h 14m 53s}  +25.22d {+25d 12' 54"}
MOON_DIST:        65.89 [deg]
MOON_ILLUM:      60 [%]
GAL_COORDS:      124.19, 21.03 [deg] galactic lon,lat of the burst
ECL_COORDS:       77.20, 63.48 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN Circular #34940
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 1654 s of XRT Photon Counting mode data and 2 UVOT images for GRB 231104A, 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 = 23.80633, +83.79348 which is equivalent to:
```
RA (J2000): 01h 35m 13.52s
Dec (J2000): +83d 47' 36.5"
```
with an uncertainty of 2.2 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 #34941
N. P. M. Kuin (UCL/MSSL) and K. L. Page (U. Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 231104A 91 s after the BAT trigger (Page et al., GCN Circ. 34940). No optical afterglow consistent with the XRT position (Goad et al., GCN Circ. 34940) 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            91          241          147         >21.7
u_FC               304          553          246         >20.7
white               91         1709          411         >21.8
v                  633         1758          117         >19.3
b                  559         1684          117         >20.4
u                  304         1659          343         >20.9
w1                 683         1808          117         >19.7
m2                 659          679           20         >18.6
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.156 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #34943
G. Principe (University of Trieste), F. Longo (University of Trieste), N. D= i Lalla (Stanford University), D. Tak (Seoul National University) report on= behalf of the Fermi-LAT Collaboration:
At 01:47:28 on November 04, 2023 Fermi-LAT detected high-energy emission fr= om GRB 231104A, which was also detected by Fermi-GBM (trigger 720755253.138= 75 / 231104075, GCN 34937) and Swift (GCN 34938).
The best LAT on-ground location is found to be
RA, Dec =3D 24.1, 84.0 (degrees, J2000)
with an error radius of 0.7 deg (90 % containment, statistical error only). This was 29 deg from the LAT boresight at the time of the trigger.
The data from the Fermi-LAT show a significant increase in the event rate t= hat is spatially and temporally correlated with the trigger with high signi= ficance. The 100 MeV - 1 GeV photon flux in the time interval 0-400 s after the GBM trigger is (6.6 =C2=B1 2.2) E-06 ph/cm2/s.
The estimated integrated photon index above 100 MeV is -2.7 +/- 0.5. The hi= ghest-energy photon is a 530 MeV event which is observed 120=C2=A0seconds a= fter the GBM trigger.
The Fermi-LAT point of contact for this burst is Giacomo Principe (giacomo.principe@ts.infn.it).
The Fermi-LAT is a pair conversion telescope designed to cover the energy b= and from 20 MeV to greater than 300 GeV. It is the product of an internatio= nal collaboration between NASA and DOE in the U.S. and many scientific inst= itutions across France, Italy, Japan and Sweden.
GCN Circular #34944
J.A. Kennea (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), M. Capalbi (INAF-IASFPA), M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC & INAF-OAR), A. Tohuvavohu (U. Toronto), D.N. Burrows (PSU) and P.A. Evans report on behalf of the Swift-XRT team:
We have analysed 6.6 ks of XRT data for GRB 231104A, from 72 s to 34.5 ks after the BAT trigger. The data comprise 62 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 late-time light curve (from T0+10.9 ks) can be modelled with a power-law decay with a decay index of alpha=1.08 (+/-0.22).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.93 (+0.28, -0.27). The best-fitting absorption column is 7.9 (+1.1, -1.0) x 10^22 cm^-2, in excess of the Galactic value of 1.3 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 9.9 x 10^-11 (3.0 x 10^-10) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     7.9 (+1.1, -1.0) x 10^22 cm^-2
Galactic foreground: 1.3 x 10^21 cm^-2
Excess significance: 12.5 sigma
Photon index:	     1.93 (+0.28, -0.27)
```
If the light curve continues to decay with a power-law decay index of 1.08, the count rate at T+24 hours will be 0.017 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.7 x 10^-12 (5.0 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/01194500.
This circular is an official product of the Swift-XRT team.
GCN Circular #34945
P. K. Navaneeth (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a bright long-duration GRB 231104A which was also detected by Fermi-GBM (Fermi GBM Team, GCN Circ. 34937), and Swift-BAT (Page et al., GCN Circ. 34938).
The source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2023-11-04 01:47:40.35 UTC. The measured peak count rate associated with the burst is 1905 (+239, -231) counts/s above the background in the combined data of three quadrants (out of four), with a total of 2144 (+214, -227) counts. The local mean background count rate was 232 (+6, -7) counts/s. Using cumulative rates, we measure a T90 of 5 (+1, -1) s. We note that the total count measurements are affected by a 0.3s housekeeping dead time window that coincided with the burst. We also see a faint second peak, consistent with the light curve from Fermi-GBM and Swift-BAT, which is more prominently seen in the Veto detectors as reported below. However, the peak is too weak to make any contribution to the T90 measurements in the CZT lightcurve.
The source was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2023-11-04 01:47:38.43 UTC. The measured peak count rate associated with the burst is 3448 (+108, -118) counts/s above the background in the combined data of all quadrants, with a total of 14749 (+818, -888) counts. The local mean background count rate was 1357 (+7, -8) counts/s. We measure a T90 of 24 (+1, -18) s from the cumulative Veto light curve. This longer T90 arises from a clear detection of the second peak of the GRB.
CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.
CZTI GRB detections are reported regularly on the payload site at: http://astrosat.iucaa.in/czti/?q=grb
GCN Circular #34946
Mohammad Odeh (Al-Khatim Observatory, AKO, operated by the International Astronomical Center in Abu Dhabi, UAE) and Nidhal Guessoum (American University of Sharjah, UAE) report:
We observed the Fermi GRB 231104A field (Fermi GBM team, GCN 34937) with with our 0.36m f/7.7 robotic telescope on November 4, from 17:12 to 18:22 UT (corresponding to 16.6 hours from the GRB trigger time) using (Ic) filter. We obtained 24x180 second images.
We do not detect a source within the Swift-XRT error region around the candidate X-ray source (Page et al., GCN 34938).
The following 5-sigma upper limit is calculated using the ATLAS catalog as reference: Ic = 19.7
GCN Circular #34950
S. Bala (USRA) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team:
"At 01:47:28.14 UT on 04 November 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231104A (trigger 720755253/231104075). which was also detected by Swift BAT (K. L. Page et al. 2023, GCN 34938) and Fermi LAT (G. Principe. et al. 2023, GCN 34943). The Fermi GBM on-ground location is consistent with the Swift BAT position.
The angle from the Fermi LAT boresight is 32 degrees.
The GBM light curve Consist of three distinguishable pick with a duration (T90) of about 44 s (50-300 keV). The time-averaged spectrum from T0-3.6 to T0+62.0 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.07 +/- 0.01 and the cutoff energy, parameterized as Epeak, is 539 +/- 22 keV.
The event fluence (10-1000 keV) in this time interval is (5.59 +/- 0.06)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+3.6 s in the 10-1000 keV band is 2 +/- 0.2 ph/s/cm^2.
A Band function fits the spectrum equally well with Epeak= 490 +/- 20 keV, alpha = -1.05 +/- 0.02 and beta = -2.6 +/- 0.2.
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 #34951
Z. Zhu, D. Xu (NAOC), D.B. Malesani (Radboud Univ. and DAWN/NBI), A. de Ugarte Postigo (OCA-CNRS), Z. Gray (NOT) report on behalf of a larger collaboration:
We observed the field of GRB 231104A detected by Swift (Page et al., GCN 34938) and Fermi (Fermi GBM team, GCN 34937) using the the 2.56 m Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observations started at 01:57:16 UT on 2023-11-05, i.e., ~ 1.0 day after the Swift/BAT trigger, and 9x200 s Sloan i-filter images were obtained.
No optical source is detected within or at the border of the Swift/XRT enhanced error circle (Goad et al., GCN 34940) down to upper limits of i > 24.2 mag (3-sigma), calibrated with the nearby Pan-STARRS stars and not corrected for Galactic extinction.
GCN Circular #34955
Rahul Gupta, Amit K. Ror, Amar Aryan, and S. B. Pandey (ARIES) report on behalf of a larger collaboration:
We observed the field of GRB 231104A detected by Fermi (Fermi GBM team, GCN 34937; Principe et al., GCN 34943), Swift (Page et al., GCN 34938), and AstroSat (Navaneeth et al., GCN 34945) using the 3.6m Devasthal Optical Telescope of ARIES Nainital. We have taken multiple frames having an exposure time of 100 sec in the r and i filters, respectively. We do not find any evidence of an afterglow candidate inside the Swift/XRT enhanced error circle (Goad et al., GCN 34940), consistent with other non-detections (Strausbaugh et al., GCN 34939; Kuin et al., GCN 34941; Odeh et al., GCN 34946; and Zhu et al., GCN 34951). We obtained the limiting mag of ~ 24 mag (r-band) at ~ 0.9 days post-detection.
The limiting magnitudes quoted are not corrected for the Galactic extinction in the direction of the burst. Photometric calibration is performed using the standard stars from the Pan-STARRS catalog.
This circular may be cited. 3.6m Devasthal Optical Telescope (DOT) is the recently commissioned facility in the Northern Himalayan region of India (long:79 41 04E, lat:29 21 40N, alt:2540m) owned and operated by the Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital ( https://www.aries.res.in). Authors of this GCN circular thankfully acknowledge consistent support from the staff members to run and maintain the 3.6m DOT.
GCN Circular #34957
B. Grefenstette reports on behalf of the NuSTAR Search for INteresting Gamm= a-ray Signals (SINGS) working group:
The NuSTAR SINGS working group reports the discovery of prompt emission fro= m a potential GRB 231104A in the NuSTAR CsI anti-coincidence shields and th= e CdZnTe imagers. This GRB was identified through a blind search using the = CsI shield rates. Details of the search algorithm will be described in a fu= ture paper.=20
The CsI data are recorded at 1 Hz and show a broad burst with multiple peak= s. The initial NuSTAR trigger had a T0 of 2023-11-04T01:47:31, though offli= ne analysis shows that a initial rise in the shield of 2023-11-04T01:47:37,= which is consistent with the onset time reported by Ferm GBM (Bala et al, = GCN Circ 34950). Peak 1-sec count rates were ~4,000 counts per second in bo= th the FPMA and FPMB shield units. Typical background rates are ~1,000 coun= ts per second. The burst was detected in both the CdZnTe detectors as well as in the shields.
Using the localization from Swift (Palmer et al, GCN Circ 34938):
```
 RA(J2000) =3D 01h 35m 09s
 Dec(J2000) =3D +83d 47' 27"
```
=E2=80=A6the burst was ~100-degrees from the instrument boresight.
The main burst lasts for ~6-s. Two narrow (<1-s) peaks can be seen in both the 1-Hz CsI shield rates and in the CdZnTe detectors.
The automated light curve report for this GRB, discovery report, off-line a= nalysis of the shield data, and the CdZnTe lightcurves can be found here:
https://nustarsoc.caltech.edu/NuSTAR_Public/grbs/reports/2023/231104A/
Information on NuSTAR SINGS can be found here:
https://nustarsoc.caltech.edu/NuSTAR_Public/grbs/
NuSTAR is a NASA Small Explorer mission led by Caltech and managed by JPL for NASA=E2=80=99s Science Mission Directorate in Washington.
GCN Circular #34958
Malte Busman (LMU), Daniel Gruen (LMU), Brendan O=E2=80=99Connor (CMU), Julius Gassert (LMU), Lei Hu (CMU), Antonella Palmese (CMU), Christoph Ries (LMU), Arno Riffeser (LMU/MPE), Michael Schmidt (LMU), Ananya Shankar (LMU):
We observed the position of GRB 231104A (Fermi GBM team, GCN 34937; Page et al., GCN 34938) with the 2m Fraunhofer telescope at Wendelstein Observatory, Germany. Observations were obtained using the 3kk imager in the r, z, and K bands simultaneously starting on 2023-11-06 at 12:09:53 UT with a total exposure of 6,021 seconds.
At the position of the XRT source (Goad et al., GCN 34940) we do not detect any source within 15=E2=80=9D to depth r> 23.6 and K>21.0 AB mag at 2.4 days after the GRB trigger. The magnitudes are not corrected for Milky Way extinction and the photometry was calibrated against nearby stars in the PS1 and 2MASS catalogs.
We thank the staff of the Wendelstein Observatory for obtaining these observations.
GCN Circular #34961
Alzbeta Malenakova, Martin Jelinek and Jan Strobl (ASU CAS Ondrejov, CZ), Sergey Karpov, Martin Masek, Petr Janecek, Jakub Jurysek, Jan Ebr, Ronan Cunniffe, Petr Travnicek and Michael Prouza (Institute of Physics, Prague, CZ)
report:
The 25cm robotic telescope FRAM-ORM at La Palma (Spain) reacted robotically to the Fermi-GBM/Swift/Fermi-LAT/AstroSat CZTI alert of GRB 231104A (Bala et al., GCNC 34937, Page et al., GCNC 34938 and Goad et al., GCNC 34940, Principe. et al. 2023, GCNC 34943, Navaneeth et al., GCNC 34945), obtaining a series of 20s unfiltered images starting at 01:48:10.3 UT, i.e. 31.3s post trigger, covering the third gamma ray episode of the GRB.
We do not detect any new source in comparison to Atlas Refcat 2.0 (Tonry et al., 2018) neither in single images (detection limit r'>17.6) nor in a combined 40x20s frame (mean exp time 960s post trigger, with a limit r'>18.6) similarly to Strausbaugh et al. (GCNC 34939), Kuin et al. (GCNC 34941), Odeh et al. (GCNC 34946), Zhu et al. (GCNC 34951), Gupta et al. (GCNC 34955) and Busman et al. (GCNC 34958).
GCN Circular #34964
M. Stamatikos (OSU), S. D. Barthelmy (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa),C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Parsotan (GSFC/UMBC), T. Sakamoto (AGU),(i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 231104A (trigger #1194500) (Page et al., GCN Circ. 34938). The BAT ground-calculated position is RA, Dec = 23.824, 83.794 deg which is
```
   RA(J2000)  =  01h 35m 17.8s
   Dec(J2000) = +83d 47' 38.7"
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 89%.
The BAT light curve shows a complex structure with a duration of ~ 80 sec. T90 (15-350 keV) is 46.77 +- 1.54 sec (estimated error including systematics).
The time-averaged spectrum from T-13.39 to T+55.84 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.24 +- 0.03. The fluence in the 15-150 keV band is 1.3 +- 0.0 x 10^-05 erg/cm2. The 1-sec peak photon flux measured from T+0.24 sec in the 15-150 keV band is 24.8 +- 0.6 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/1194500/BA/
GCN Circular #35008
M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werne= r (Masaryk U.), M. Ohno (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Obs= ervatory), H. Takahashi (Hiroshima U.), F. Munz , M. Topinka, F. Hroch, N. = Husarikova, J.-P. Breuer (Masaryk U.), J. Hudec, J. Kapus, M. Frajt, M. Rez= enov (Spacemanic s.r.o), R. Laszlo (Needronix), G. Galgoczi (Wigner Researc= h Center/Eotvos U.), N. Uchida (ISAS/JAXA), T. Enoto (Kyoto U.), Zs. Frei (= Eotvos U.), Y. Fukazawa, K. Hirose, H. Matake (Hiroshima U.), S. Hisadomi (= Nagoya U.), Y. Ichinohe (Rikkyo U.), L. L. Kiss (Konkoly Observatory), T. = Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), K= . Torigoe (Hiroshima U.), P. Svoboda, V. Daniel, J. Dudas, M. Junas, J. Gro= mes (VZLU), I. Vertat (FEL ZCU) -- the VZLUSAT-2/GRB payload collaboration= .
The long-duration GRB 231104A (Fermi/GBM detection: GCN 34937; Fermi/LAT de= tection: GCN 34943; Swift/BAT detection: GCN 34938; AstroSat detection: GCN= 34945; NuSTAR detection: GCN 34957; Konus/WIND trigger at 2023-11-04 01:47= :39.141 UT, INTEGRAL/SPI-ACS peak detection at 2023-11-04 ~01:47:40 UT) was= detected by the GRB detector on board of the VZLUSAT-2 3U CubeSat (https:/= /www.vzlusat2.cz/en/).
The data acquisition was performed by the GRB detector unit no. 1. The dete= ction was confirmed at the peak time 2023-11-04 01:47:39 UTC. The T90 durat= ion is 26 s and the significance during T90 reaches 21 sigma.
The light curve obtained by VZLUSAT-2 is available here: https://vzlusat2.konkoly.hu/static/share/GRB231104A_GCN_VZLUSAT2.pdf
All VZLUSAT-2 detections are listed at: https://monoceros.physics.muni.cz/h= ea/VZLUSAT-2/ The GRB detectors on VZLUSAT-2 are a demonstration payload for a future Cub= eSat constellation (Werner et al. Proc. SPIE 2018). Two GRB modules of VZLU= SAT-2 are placed in a perpendicular manner and each consists of a 75 x 75 x= 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range= from ~30 keV to ~1000 keV. VZLUSAT-2 was launched on 2022 January 13 from = Cape Canaveral.

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Jochen Greiner, last update: 13-Nov-2023 [Disclaimer]