Gamma-ray Burst 231210B

(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:     Sun 10 Dec 23 21:29:35 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1201696,   Seg_Num: 0
GRB_RA:           95.772d {+06h 23m 05s} (J2000),
                  95.930d {+06h 23m 43s} (current),
                  95.443d {+06h 21m 46s} (1950)
GRB_DEC:         -48.359d {-48d 21' 32"} (J2000),
                 -48.373d {-48d 22' 21"} (current),
                 -48.332d {-48d 19' 54"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       12818 [cnts]    Image_Peak=271 [image_cnts]
TRIGGER_DUR:     2.048 [sec] 
TRIGGER_INDEX:   263     E_range: 25-100 keV
BKG_INTEN:       160067 [cnts]
BKG_TIME:        77311.47 SOD {21:28:31.47} UT
BKG_DUR:         24 [sec]
GRB_DATE:        20288 TJD;   344 DOY;   23/12/10
GRB_TIME:        77344.49 SOD {21:29:04.49} UT
GRB_PHI:         130.89 [deg]
GRB_THETA:        40.32 [deg]
SOLN_STATUS:     0x203
RATE_SIGNIF:     14.52 [sigma]
IMAGE_SIGNIF:    7.31 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +2  -3  +0  +0 +28  +0 
SUN_POSTN:       257.56d {+17h 10m 15s}  -22.94d {-22d 56' 33"}
SUN_DIST:        106.81 [deg]   Sun_angle= 10.8 [hr] (West of Sun)
MOON_POSTN:      229.33d {+15h 17m 20s}  -20.69d {-20d 41' 20"}
MOON_DIST:        99.38 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      256.52,-24.44 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      102.19,-71.55 [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:        Since the foreground interval count rate is less than the bkg interval (SAA exit), this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 347.09,-18.40 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 10 Dec 23 21:31:46 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     1201696,   Seg_Num: 0
GRB_RA:           95.7951d {+06h 23m 10.8s} (J2000),
                  95.9527d {+06h 23m 48.6s} (current),
                  95.4662d {+06h 21m 51.8s} (1950)
GRB_DEC:         -48.3693d {-48d 22' 09.4"} (J2000),
                 -48.3829d {-48d 22' 58.5"} (current),
                 -48.3420d {-48d 20' 31.1"} (1950)
GRB_ERROR:       6.5 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       21 [cnts]
IMG_START_DATE:  20288 TJD;   344 DOY;   23/12/10
IMG_START_TIME:  77467.86 SOD {21:31:07.86} UT,   123.4 [sec] since BAT Trigger Time
CENTROID_X:      332.61,  raw= 333  [pixels]
CENTROID_Y:      331.71,  raw= 332  [pixels]
ROLL:            162.50 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   79.23
GRB_POS_XRT_Z:   59.43
IMAGE_URL:       sw01201696000msxps_rw.img
SUN_POSTN:       257.56d {+17h 10m 15s}  -22.94d {-22d 56' 33"}
SUN_DIST:        106.80 [deg]   Sun_angle= 10.8 [hr] (West of Sun)
MOON_POSTN:      229.35d {+15h 17m 25s}  -20.70d {-20d 41' 44"}
MOON_DIST:        99.36 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      256.54,-24.43 [deg] galactic lon,lat of the burst
ECL_COORDS:      102.24,-71.56 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 10 Dec 23 21:31:48 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     1201696,   Seg_Num: 0
GRB_RA:           95.7951d {+06h 23m 10.8s} (J2000),
                  95.9527d {+06h 23m 48.6s} (current),
                  95.4662d {+06h 21m 51.8s} (1950)
GRB_DEC:         -48.3693d {-48d 22' 09.4"} (J2000),
                 -48.3829d {-48d 22' 58.5"} (current),
                 -48.3420d {-48d 20' 31.1"} (1950)
GRB_ERROR:       6.5 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       21 [cnts]
IMG_START_DATE:  20288 TJD;   344 DOY;   23/12/10
IMG_START_TIME:  77467.86 SOD {21:31:07.86} UT,   123.4 [sec] since BAT Trigger Time
CENTROID_X:      332.61,  raw= 333  [pixels]
CENTROID_Y:      331.71,  raw= 332  [pixels]
ROLL:            162.50 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   79.23
GRB_POS_XRT_Z:   59.43
IMAGE_URL:       sw01201696000msxps_rw.img
SUN_POSTN:       257.56d {+17h 10m 15s}  -22.94d {-22d 56' 33"}
SUN_DIST:        106.80 [deg]   Sun_angle= 10.8 [hr] (West of Sun)
MOON_POSTN:      229.35d {+15h 17m 25s}  -20.70d {-20d 41' 45"}
MOON_DIST:        99.36 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      256.54,-24.43 [deg] galactic lon,lat of the burst
ECL_COORDS:      102.24,-71.56 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 10 Dec 23 21:31:36 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     1201696,   Seg_Num: 0
GRB_RA:           95.7951d {+06h 23m 10.82s} (J2000),
                  95.9527d {+06h 23m 48.63s} (current),
                  95.4662d {+06h 21m 51.87s} (1950)
GRB_DEC:         -48.3693d {-48d 22' 09.4"} (J2000),
                 -48.3829d {-48d 22' 58.5"} (current),
                 -48.3420d {-48d 20' 31.1"} (1950)
GRB_ERROR:       6.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       4.31e-10 [erg/cm2/sec]
GRB_SIGNIF:      4.58 [sigma]
IMG_START_DATE:  20288 TJD;   344 DOY;   23/12/10
IMG_START_TIME:  77467.86 SOD {21:31:07.86} UT,   123.4 [sec] since BAT Trigger Time
TAM[0-3]:        327.65 237.17 261.52 243.68
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       257.56d {+17h 10m 15s}  -22.94d {-22d 56' 33"}
SUN_DIST:        106.80 [deg]   Sun_angle= 10.8 [hr] (West of Sun)
MOON_POSTN:      229.35d {+15h 17m 24s}  -20.70d {-20d 41' 43"}
MOON_DIST:        99.36 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      256.54,-24.43 [deg] galactic lon,lat of the burst
ECL_COORDS:      102.24,-71.56 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.09 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 10 Dec 23 21:33:01 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1201696,   Seg_Num: 0
GRB_RA:           95.772d {+06h 23m 05s} (J2000),
                  95.930d {+06h 23m 43s} (current),
                  95.443d {+06h 21m 46s} (1950)
GRB_DEC:         -48.359d {-48d 21' 32"} (J2000),
                 -48.373d {-48d 22' 21"} (current),
                 -48.332d {-48d 19' 54"} (1950)
GRB_DATE:        20288 TJD;   344 DOY;   23/12/10
GRB_TIME:        77344.49 SOD {21:29:04.49} UT
TRIGGER_INDEX:   263
GRB_PHI:         130.89 [deg]
GRB_THETA:        40.32 [deg]
DELTA_TIME:      57.00 [sec]
TRIGGER_DUR:     2.048 [sec] 
SOLN_STATUS:     0x203
RATE_SIGNIF:     14.52 [sigma]
IMAGE_SIGNIF:    7.31 [sigma]
LC_URL:          sw01201696000msb.lc
SUN_POSTN:       257.56d {+17h 10m 15s}  -22.94d {-22d 56' 34"}
SUN_DIST:        106.81 [deg]   Sun_angle= 10.8 [hr] (West of Sun)
MOON_POSTN:      229.37d {+15h 17m 28s}  -20.70d {-20d 41' 58"}
MOON_DIST:        99.38 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      256.52,-24.44 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      102.19,-71.55 [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:        Since the foreground interval count rate is less than the bkg interval (SAA exit), this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 347.09,-18.40 [deg].

GCN Circular #35312
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-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) was pointed to the Swift GRB231210.90 (trigger No 1201696,06h 23m 05.28s , -48d 21m 32.4s, R=0.05) errorbox 89 sec after notice time and 124 sec after trigger time at 2023-12-10 21:31:08 UT, with upper limit up to 18.9 mag. The observations began at zenith distance = 30 deg. The sun altitude is -33.2 deg.
The galactic latitude b = -24 deg., longitude l = 257 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2329146
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

     129 |         MASTER-SAAO | P\\ |    10 | 17.4 |        
     129 |         MASTER-SAAO |  P/ |    10 | 17.3 |        
     213 |         MASTER-SAAO | P\\ |    40 | 18.5 |        
     213 |         MASTER-SAAO |  P/ |    40 | 18.4 |        
     283 |         MASTER-SAAO | P\\ |    50 | 18.9 |        
     283 |         MASTER-SAAO |  P/ |    50 | 18.9 |        
```
The observation and reduction will continue. The message may be cited.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 10 Dec 23 21:39:39 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1201696,   Seg_Num: 0
POINT_RA:         95.771d {+06h 23m 05s} (J2000)
POINT_DEC:       -48.393d {-48d 23' 35"} (J2000)
POINT_ROLL:      162.499d
IMG_START_DATE:  20288 TJD;   344 DOY;   23/12/10
IMG_START_TIME:  77806.98 SOD {21:36:46.98} UT,   462.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.496
N_STARS:         134
X_OFFSET:        236 [pixels]
Y_OFFSET:        597 [pixels]
X_MAX:           1195 [pixels]
Y_MAX:           1556 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw01201696000msufc0462.fits
SUN_POSTN:       257.57d {+17h 10m 16s}  -22.94d {-22d 56' 35"}
SUN_DIST:        106.78 [deg]   Sun_angle= 10.8 [hr] (West of Sun)
MOON_POSTN:      229.43d {+15h 17m 42s}  -20.72d {-20d 43' 11"}
MOON_DIST:        99.37 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      256.56,-24.45 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      102.20,-71.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 10 Dec 23 21:39:56 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1201696,   Seg_Num: 0
POINT_RA:         95.771d {+06h 23m 05s} (J2000)
POINT_DEC:       -48.393d {-48d 23' 35"} (J2000)
POINT_ROLL:      162.499d
IMG_START_DATE:  20288 TJD;   344 DOY;   23/12/10
IMG_START_TIME:  77806.98 SOD {21:36:46.98} UT,   462.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.496
N_STARS:         134
X_OFFSET:        236 [pixels]
Y_OFFSET:        597 [pixels]
X_MAX:           1195 [pixels]
Y_MAX:           1556 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw01201696000msufc0462.fits
SUN_POSTN:       257.57d {+17h 10m 17s}  -22.94d {-22d 56' 35"}
SUN_DIST:        106.78 [deg]   Sun_angle= 10.8 [hr] (West of Sun)
MOON_POSTN:      229.43d {+15h 17m 43s}  -20.72d {-20d 43' 14"}
MOON_DIST:        99.37 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      256.56,-24.45 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      102.20,-71.59 [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:     Sun 10 Dec 23 21:41:03 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1201696,   Seg_Num: 0
POINT_RA:         95.771d {+06h 23m 05s} (J2000)
POINT_DEC:       -48.393d {-48d 23' 35"} (J2000)
ROLL:            162.499d
IMG_START_DATE:  20288 TJD;   344 DOY;   23/12/10
IMG_START_TIME:  77806.98 SOD {21:36:46.98} UT,   462.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     723937039
X_OFFSET:        555 [pixels]
Y_OFFSET:        916 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       715
Y_GRB_POS:       1076
BINNING_INDEX:   1
IM_URL:          sw01201696000msuni0495.fits
SUN_POSTN:       257.57d {+17h 10m 17s}  -22.94d {-22d 56' 35"}
SUN_DIST:        106.78 [deg]   Sun_angle= 10.8 [hr] (West of Sun)
MOON_POSTN:      229.44d {+15h 17m 45s}  -20.72d {-20d 43' 27"}
MOON_DIST:        99.37 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      256.56,-24.45 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      102.20,-71.59 [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:     Sun 10 Dec 23 21:41:13 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1201696,   Seg_Num: 0
POINT_RA:         95.771d {+06h 23m 05s} (J2000)
POINT_DEC:       -48.393d {-48d 23' 35"} (J2000)
ROLL:            162.499d
IMG_START_DATE:  20288 TJD;   344 DOY;   23/12/10
IMG_START_TIME:  77806.98 SOD {21:36:46.98} UT,   462.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     723937039
X_OFFSET:        555 [pixels]
Y_OFFSET:        916 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       715
Y_GRB_POS:       1076
BINNING_INDEX:   1
IM_URL:          sw01201696000msuni0495.fits
SUN_POSTN:       257.57d {+17h 10m 17s}  -22.94d {-22d 56' 36"}
SUN_DIST:        106.78 [deg]   Sun_angle= 10.8 [hr] (West of Sun)
MOON_POSTN:      229.44d {+15h 17m 46s}  -20.72d {-20d 43' 28"}
MOON_DIST:        99.37 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      256.56,-24.45 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      102.20,-71.59 [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:     Sun 10 Dec 23 21:40:38 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     1201696,   Seg_Num: 0
GRB_RA:           95.7949d {+06h 23m 10.77s} (J2000),
                  95.9524d {+06h 23m 48.58s} (current),
                  95.4660d {+06h 21m 51.83s} (1950)
GRB_DEC:         -48.3719d {-48d 22' 18.8"} (J2000),
                 -48.3855d {-48d 23' 07.9"} (current),
                 -48.3446d {-48d 20' 40.5"} (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:  20288 TJD;   344 DOY;   23/12/10
IMG_START_TIME:  77797.00 SOD {21:36:37.00} UT,   452.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       257.57d {+17h 10m 17s}  -22.94d {-22d 56' 35"}
SUN_DIST:        106.79 [deg]   Sun_angle= 10.8 [hr] (West of Sun)
MOON_POSTN:      229.44d {+15h 17m 44s}  -20.72d {-20d 43' 22"}
MOON_DIST:        99.37 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      256.54,-24.43 [deg] galactic lon,lat of the burst
ECL_COORDS:      102.25,-71.56 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
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 #35313
D. Buckley (South African Astronomical Observatory),
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),
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-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) was pointed to the GRB231210.90 92 sec after notice time and 124 sec after trigger time at 2023-12-10 21:31:08 UT. On our first (10s exposure) set we found 1 optical transient within Swift error-box (ra=95.7708 dec=-48.3583 r=0.05) brighter than 16.9.
```
 T-Tmid      Date      Time       Expt.        Ra                Dec           Mag
---------|---------------------|-------|-----------------|-----------------|-------
     129   2023-12-10 21:31:08      10   (06h 23m 11.01s , -48d 22m 20.5s)     16.3
```
The 5-sigma upper limit has been about 16.9mag The message may be cited.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 10 Dec 23 21:49:41 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1201696,   Seg_Num: 0
POINT_RA:         95.771d {+06h 23m 05s} (J2000)
POINT_DEC:       -48.393d {-48d 23' 35"} (J2000)
POINT_ROLL:      162.500d
IMG_START_DATE:  20288 TJD;   344 DOY;   23/12/10
IMG_START_TIME:  78212.89 SOD {21:43:32.89} UT,   868.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.464
N_STARS:         190
X_OFFSET:        0 [pixels]
Y_OFFSET:        357 [pixels]
X_MAX:           1439 [pixels]
Y_MAX:           1796 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw01201696000msufc0868.fits
SUN_POSTN:       257.58d {+17h 10m 18s}  -22.94d {-22d 56' 37"}
SUN_DIST:        106.78 [deg]   Sun_angle= 10.8 [hr] (West of Sun)
MOON_POSTN:      229.52d {+15h 18m 05s}  -20.75d {-20d 45' 01"}
MOON_DIST:        99.38 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      256.56,-24.45 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      102.20,-71.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN Circular #35314
K. L. Page (U Leicester), J.D. Gropp (PSU), J. A. Kennea (PSU), D. M. Palmer (LANL), T. M. Parsotan (GSFC/UMBC/CRESSTII) and M. A. Williams (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 21:29:04 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 231210B (trigger=1201696). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 95.772, -48.359 which is
```
   RA(J2000) = 06h 23m 05s
   Dec(J2000) = -48d 21' 32"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 15 sec. However, since this GRB occurred while the spacecraft was leaving the SAA, the rate lightcurve is hard to interpret. The peak count rate was ~1500 counts/sec (15-350 keV), at ~T+0 sec after the trigger.
The XRT began observing the field at 21:31:07.8 UT, 123.4 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source with an enhanced position: RA, Dec 95.79386, -48.37201 which is equivalent to:
```
   RA(J2000)  = 06h 23m 10.53s
   Dec(J2000) = -48d 22' 19.2"
```
with an uncertainty of 1.9 arcseconds (radius, 90% containment). This location is 70 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. 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 4.31e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 462 seconds after the BAT trigger. Due to tracking issues, the UVOT image is blurred. However, comparison with DSS shows that there appears to be a new source coincident with the XRT localization. Further data and analysis will be needed to report an accurate localization and magnitude of this object.
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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 10 Dec 23 21:49:51 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1201696,   Seg_Num: 0
POINT_RA:         95.771d {+06h 23m 05s} (J2000)
POINT_DEC:       -48.393d {-48d 23' 35"} (J2000)
POINT_ROLL:      162.500d
IMG_START_DATE:  20288 TJD;   344 DOY;   23/12/10
IMG_START_TIME:  78212.89 SOD {21:43:32.89} UT,   868.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.464
N_STARS:         190
X_OFFSET:        0 [pixels]
Y_OFFSET:        357 [pixels]
X_MAX:           1439 [pixels]
Y_MAX:           1796 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw01201696000msufc0868.fits
SUN_POSTN:       257.58d {+17h 10m 18s}  -22.94d {-22d 56' 37"}
SUN_DIST:        106.78 [deg]   Sun_angle= 10.8 [hr] (West of Sun)
MOON_POSTN:      229.52d {+15h 18m 05s}  -20.75d {-20d 45' 03"}
MOON_DIST:        99.38 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      256.56,-24.45 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      102.20,-71.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #35316
I. P=C3=A9rez-Fournon, F. Poidevin (IAC and ULL), H. Akoudad-Ekajouan, C. A= raujo-=C3=81lvarez, C. Arrizabalaga-D=C3=ADaz-Caneja, F. Barnes-S=C3=A1nche= z, P. Eguiguren-Arrizabalaga, A. Iglesias-L=C3=B3pez, G.A. Jaimes-Illanes, = P. Jim=C3=A9nez-S=C3=A1nchez, S. Lamolda-Mir, A. Mang-Rom=C3=A1n, G. Marrer= o-Ramallo, P.P. Meni-Gallardo, I. Ruiz-Cejudo (ULL), M. S=C3=A1nchez-And=C3= =BAjar (ULL and IAC), V. Wienzek (ULL), E. Esparza-Borges, and F. Tinaut-Ru= ano (IAC and ULL)
report observations of GRB 231210B with the LCOGT 40cm telescope at Sutherl= and Observatory starting on 2023-12-10 22:22:25 UT in the SDSS g', r', and = i' filters.
We detect a source in the three filters at the position RA (J2000) =3D 06h = 23m 10.997s, Dec (J2000) =3D -48d 22m 19.87s, that is close to the Swift p= osition reported by Page et al. (GCN 35314) and the optical transient repor= ted by Buckley et al. (GCN 35313).
We measure the following magnitudes:
```
  Date      Time        Filter    Exposure (sec)            Mag      Error
---------------------|-----------|---------------------|------------|-------
2023-12-10 22:22:25     g          180                       20.72     0.18
2023-12-10 22:25:34     r          180                       19.69     0.12
2023-12-10 22:28:42     i          180                       19.62     0.26
```
GCN Circular #35317
A. Saccardi (GEPI, Observatoire de Paris), B. Schneider (MIT), L. Izzo (INA= F-Naples & DARK/NBI), D. B. Malesani (DAWN/NBI), C. Pe=C3=B1a (Univ. of Uta= h) report on behalf of the Stargate collaboration:
We observed the field of the Swift GRB 231210B (Page et al., GCN 35314) usi= ng the ESO/VLT/UT3 (Melipal) equipped with the X-shooter spectrograph. Our = spectra cover the wavelength range 3000-21000 AA, and consist of 4 exposure= s of 600s each. The observation starting-time is 01:32:26 UT on Dec 11 2023= (~4 hr after the Swift trigger).
In images taken with the acquisition camera, we clearly detect the optical = afterglow consistent with the position reported by Buckley et al., GCN 3531= 3 and P=C3=A9rez-Fournon et al., GCN 35316. We measure the following AB mag= nitudes (calibrated against SkyMapper stars): g' =3D 21.82 +/- 0.05 mag, r'= =3D 21.23 +/- 0.04 mag, z' =3D 21.03 +/- 0.07 mag.
We detect a continuum over the entire wavelength range. From the detection of a broad Lya absorption at ~5000 AA and multiple absorption features, which we interpret as being due to NV, SiII, SII, OI, CII, ZnII, FeII, AlII, CIV, SiIV, FeII*, OI*, SiII*, CII*, we infer a common redshift of z = 3.13. We conclude this is the redshift of the burst. We also note the presence of additional absorption features likely due to multiple intervening systems.
We acknowledge the excellent support from the ESO staff in Paranal, in particular Maria Jose Rain, Zahed Wahhaj and Thomas Seifert.
GCN Circular #35318
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 1563 s of XRT Photon Counting mode data and 1 UVOT images for GRB 231210B, 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 = 95.79470, -48.37226 which is equivalent to:
```
RA (J2000): 06h 23m 10.73s
Dec (J2000): -48d 22' 20.2"
```
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 #35319
J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), M. Capalbi (INAF-IASFPA), M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC & INAF-OAR), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), D.N. Burrows (PSU) and P.A. Evans report on behalf of the Swift-XRT team:
We have analysed 6.4 ks of XRT data for GRB 231210B, from 410 s to 35.6 ks after the BAT trigger. The data comprise 40 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode.
The light curve can be modelled with a power-law decay with a decay index of alpha=1.32 (+0.05, -0.04).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.65 (+0.11, -0.10). The best-fitting absorption column is 5.3 (+7.7, -5.3) x 10^21 cm^-2, at a redshift of 3.13, in addition to the Galactic value of 4.1 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.0 x 10^-11 (4.3 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Galactic foreground: 4.1 x 10^20 cm^-2
Intrinsic column:    5.3 (+7.7, -5.3) x 10^21 cm^-2 at z=3.13
Photon index:	     1.65 (+0.11, -0.10)
```
If the light curve continues to decay with a power-law decay index of 1.32, the count rate at T+24 hours will be 4.5 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.8 x 10^-13 (1.9 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01201696.
This circular is an official product of the Swift-XRT team.
GCN Circular #35322
T. Sakamoto (AGU), 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), K. L. Page (U Leicester) T. Parsotan (GSFC/UMBC), M. Stamatikos (OSU) (i.e. the Swift-BAT team):
Using the data set from T-36 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 231210B (trigger #1201696) (Page, et al., GCN Circ. 35314). The BAT ground-calculated position is RA, Dec = 95.803, -48.335 deg which is
```
   RA(J2000)  =  06h 23m 12.7s
   Dec(J2000) = -48d 20' 04.6"
```
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 17%.
The mask-weighted light curve shows a FRED pulse potentially followed by a dimmer spike. T90 (15-350 keV) is 7.47 +- 0.65 sec (estimated error including systematics).
The time-averaged spectrum from T-0.23 to T+7.82 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.08 +- 0.19. The fluence in the 15-150 keV band is 1.4 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T-0.24 sec in the 15-150 keV band is 3.9 +- 0.7 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/1201696/BA/
GCN Circular #35323
S. de Wet (UCT), P.M. Vreeswijk (Radboud) and P.J. Groot (Radboud/UCT/SAAO)= report on behalf of the MeerLICHT consortium:
The 0.6 m wide-field MeerLICHT optical telescope located in Sutherland, Sou= th Africa, obtained a repeated series of 60 s exposures in the q,u,g,r,i,z = bands of GRB 231210B following the Swift detection (Page et al., GCN 35314)= . Observations started at 21:32:26 UT on 2023 November 18 (202 seconds post= -trigger) and continued for a further 1.79 hours, following the filter sequ= ence quqgqrqiqz.=20
We detect the optical afterglow also detected by MASTER, UVOT, LCOGT, and t= he VLT (Buckley et al., GCN 35313; Page et al., GCN 35314; P=C3=A9rez-Fourn= on et al., GCN 35316; Saccardi et al., GCN 35317) with the following AB mag= nitudes:
```
q =3D 17.15 +/- 0.02 at 21:32:57 UT
u =3D 19.67 +/- 0.19 at 21:34:20 UT
g =3D 18.69 +/- 0.04 at 21:37:17 UT
r =3D 18.11 +/- 0.03 at 21:40:11 UT
i =3D 18.15 +/- 0.05 at 21:43:08 UT
z =3D 18.30 +/- 0.11 at 21:46:05 UT
```
As a precaution, we note that the absolute photometric calibration may have been adversely affected by condensation in the cryostat window due to high humidity. Our high cadence q-band observations show a power-law decline with a temporal index of -1.2 throughout the observations.=20
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.
GCN Circular #35333
M. Ferro, R. Brivio, P. D'Avanzo, S. Covino, D. Fugazza (INAF-OAB) on behalf of the REM team, report:
We observed the field of GRB 231210B (Page et al., GCN 35314) with the REM 60cm robotic telescope located at the ESO Observatory of La Silla (Chile). The observations were carried out in the g,r,i,z, J,H,K bands, starting on 2023 Dec 11 at 00:36:37 UT (i.e. about 3.13 hours after the Swift trigger) and lasted for about 1 hour. From preliminary analysis, we do not find any source at the enhanced XRT position (Beardmore et al., GCN 35318), down the the following 3 sigma upper limits:
r > 21.0 (AB; calibrated against the SkyMapper catalogue) at a mid time of t-t0 ~ 3.80 h after the GRB trigger;
H > 17.4 (Vega; calibrated against the 2MASS catalogue) at a mid time of t-t0 ~ 3.56 h after the GRB trigger.
GCN Circular #35358
L. Rhodes (Oxford), G. E. Anderson (Curtin), A. J. van der Horst (GWU), J. K. Leung (UofT/HUJI), O. Sharan Salafia (INAF), S. D. Ryder (Macquarie), A. Gulati (USyd), S. Chastain (UNM) on behalf of the PanRadio GRB collaboration
We observed short GRB 231210B (Page et al., GCN 35314) starting at 2023-12-14 10:56UT for 9 hours with the Australia Telescope Compact Array (ATCA), as part of the "PanRadio GRB" Large ATCA follow-up programme C3542 (PI. Anderson).
We do not detect any clear radio counterpart. The rms noise in our observations is 17 and 12 uJy/beam at 5.5 and 9GHz, respectively. At a redshift of 3.13 (Saccardi et al GCN 35317), our measurements correspond to 3-sigma upper limits of 6.6e30 and 4.7e30 erg/s/Hz at 5.5 and 9GHz, respectively (assuming H0 = 70km/s/Mpc and OmegaM = 0.3)
We thank the CSIRO Space and Astronomy staff for supporting these observations. We acknowledge the Gomeroi people as the traditional owners of the Observatory site. The Australia Telescope Compact Array is part of the Australia Telescope National Facility (https://ror.org/05qajvd42) which is funded by the Australian Government for operation as a National Facility managed by CSIRO.
GCN Circular #35359
D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report:
The long GRB 231210B (Swift detection: Page et al., GCN 35314) triggered Konus-Wind (KW) at T0=3D77347.988 s UT (21:29:07.988).
The burst light curve shows a multi-peaked structure with a total duration of of ~9 s. The emission is seen up to ~0.5 MeV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB231210_T77347/
As observed by Konus-Wind, the burst had a total fluence of (4.02 =C2=B1 0.56)x10^-6 erg/cm^2 and a 64-ms peak energy flux, measured from T0+2.944 s, of (2.19 =C2=B1 0.32)x10^-6 erg/cm^2/s (both in the 20 keV - 10 MeV energy = range).
The time-integrated spectrum of the burst (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 15 MeV range by a power law with exponential cutoff (CPL) model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha =3D -0.62(-0.37,+0.44) and Ep =3D 174(-27,+40) keV (chi2 =3D 65= /87 dof). Fitting this spectrum by a Band function yields the same values of alpha an= d Ep, and an upper limit on the high energy photon index beta of -2.5 (chi2 =3D 6= 5/86 dof).
Assuming the redshift z=3D3.13 (Saccardi et al., GCN 35317) and a standard cosmology with H_0 =3D 67.3 km/s/Mpc, Omega_M =3D 0.315, and Omega_Lambda =3D 0.685 (Planck Collaboration, 2014), we estimate the burst isotropic energy release E_iso to (8.8 =C2=B1 1.3)x10= ^52 erg, the isotropic peak luminosity L_iso to (2.0 =C2=B1 0.3)x10^53 erg/s, the rest-frame peak energy of the spectrum Ep,z to ~720 keV. With the obtained estimates, GRB 231210B is inside 90% prediction band for the 'Amati' relation and inside 68% prediction band for the 'Yonetoku' rela= tion derived for the sample of >300 long KW GRBs with known redshifts (Tsvetkova et al., 2017; Tsvetkova et al., 2021), see http://www.ioffe.ru/LEA/GRBs/GRB231210_T77347/GRB231210B_rest_frame.pdf
All the quoted errors are estimated at the 68% confidence level. All the presented results are preliminary.
GCN Circular #35406
K. Siellez, B. Emptage, K. Hill, J.-P. Beaulieu (Institute of Astrophysics in Paris / UTas), A. Cole, T. Plunkett report:
a new optical transient for the GRB 231210B observed with the Harlingten 50cm Telescope starting on 2023-12-11 17:14:35 UT in Sloan r' and g' filters.
We detect an optical transient at the position RA (J2000) = 06h 23m 05.924s, Dec (J2000) = -48d 19' 11.65", which is not included in the Swift XRT position (Page et al., GCN 35314), but is within the BAT enhanced ground-calculated position (Sakamoto et al., GCN 35322). It has a different position than the optical afterglows already published (GCN 35316, GCN 35323).
The observations leading to the measurements of the magnitude were made as followed:
```
  Date     Time             Filter        Exposure (sec)            
-------------------------|-----------|-----------------------------------
2023-12-11 17:14:35.536        r               180                       
2023-12-11 17:17:44.365        r               180                       
2023-12-11 17:20:53.192        r               180      
2023-12-11 17:24:02:021        r               180      
2023-12-11 17:27:10.853        r               180   
```
On 2023-12-11 we stacked 5 pictures of 180s exposure time for a total of 900s exposure time, with r' filter. We obtain a magnitude of 19.2 +/- 0.1 in r'.
```
  Date     Time             Filter        Exposure (sec)            
-------------------------|-----------|-----------------------------------
2023-12-12 11:49:41.012        g'               180                       
2023-12-12 11:52:49.835        g'               180                       
2023-12-12 11:55:58.661        g'               180      
2023-12-12 11:59:07.480        g'               180      
2023-12-12 12:05:25.121        g'               180   
```
On 2023-12-12 we stacked 5 pictures of 180s exposure time for a total of 900s exposure time, with g' filter. We obtain a magnitude of 20.3 +/- 0.1 in g'.
On 2023-12-17 we stacked 5 pictures of 180s exposure time for a total of 900s exposure time, with r' filter. We obtain a magnitude of 20.1 +/- 0.1 in r'.
More data were taken on the days in between and will be released soon. We encourage the follow up of this optical transient in all wavelengths.
We acknowledge the traditional custodians of the land upon which we built our telescope: the Palawa / Pakana and Gadigal people. The team wants to thank Caisey Harlingten for his donation and support, the late Dr. John Greenhill who created and pushed forward the development of this optical observatory, as well as Dr. Tony Sprent and Dr. Keith Bolton, who keep supporting and developing the telescopes.
GCN Circular #35433
A. J. Castro-Tirado, Y.-D. Hu, E. Fernandez-Garcia, M.D. Caballero-Garcia, = R. Sanchez-Ramirez, I. Perez-Garcia, S.-Y. Wu, S. Guziy =C2=A0(IAA-CSIC Gra= nada), C. Perez del Pulgar, A. Castellon, A. Reina (Univ. de Malaga), B.-B.= Zhang (Nanjing Univ.) and A. Maury (Space, San Pedro de Atacama), report:
Following the detection of GRB 231210B by Swift (Page et al., GCNC 35314) a= nd Konus-Wind (Frederiks et al. GCNC 35359), the 0.6m BOOTES-7 robotic tele= scope at San Pedro de Atacama (Chile) pointed to the burst position on Dec.= 21 at 01:32 UT (i.e. ~10.2 days after trigger). Images were gathered in di= fferent optical bands. In the co-added r-band image (8 x 300 s, SDSS-r filt= er), the optical afterglow reported by MASTER (Lipunov et al. GCNC 35313), = UVOT (Page et al., GCNC 35314), LCOGT (P=C3=A9rez-Fournon et al. GCNC 35316= ), VLT (Saccardi et al. GCNC 35317) and MeerLICHT (de Wet et al. GCNC 35323= ) is not detected within the enhanced Swift/XRT position (Beardmore et al. = GCNC 35318) down to 21.0 mag, which is consistent with the REM results (Fer= ro et al. GCNC 35333).
Regarding the source reported at the Greenhill Observatory (Siellez et al. = GCNC 35406), we cannot clearly identify it since it is blended with a nearb= y and brighter star 0.4" away. In any case, we notice that this object is p= resent on the DESI catalog and it is far from the enhanced Swift/XRT positi= on and therefore unrelated to GRB 231210B.
BOOTES-7 is the last observatory completing the BOOTES Global Network of ro= botic telescopes in all the continents (Castro-Tirado 2023, Nat. Astron. 7,= 1136), 25 years after the first astronomical station was deployed in south= Spain.
We thank the staff at San Pedro de Atacama Celestial Explorations observato= ry for their excellent support.

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