Gamma-ray Burst 231216A

(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 16 Dec 23 18:41:06 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1202749,   Seg_Num: 0
GRB_RA:           39.759d {+02h 39m 02s} (J2000),
                  40.123d {+02h 40m 29s} (current),
                  39.001d {+02h 36m 00s} (1950)
GRB_DEC:         +33.596d {+33d 35' 45"} (J2000),
                 +33.698d {+33d 41' 53"} (current),
                 +33.381d {+33d 22' 51"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       1754 [cnts]    Image_Peak=123 [image_cnts]
TRIGGER_DUR:     0.512 [sec] 
TRIGGER_INDEX:   42     E_range: 25-100 keV
BKG_INTEN:       18089 [cnts]
BKG_TIME:        66927.44 SOD {18:35:27.44} UT
BKG_DUR:         8 [sec]
GRB_DATE:        20294 TJD;   350 DOY;   23/12/16
GRB_TIME:        66942.03 SOD {18:35:42.03} UT
GRB_PHI:          -8.37 [deg]
GRB_THETA:        38.72 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     17.60 [sigma]
IMAGE_SIGNIF:    8.94 [sigma]
MERIT_PARAMS:     +1  +0  +0  -1  +2  -1  +0  +0 +76  +0 
SUN_POSTN:       264.05d {+17h 36m 13s}  -23.32d {-23d 19' 21"}
SUN_DIST:        140.34 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      318.67d {+21h 14m 41s}  -20.95d {-20d 56' 51"}
MOON_DIST:        94.75 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      147.32,-24.13 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       47.91, 17.20 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This Notice was delayed by more than 60 sec past the end of the trigger integration interval;  
COMMENTS:        probably due to it occurring during a Malindi downlink session.  
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 = 9.83,-13.46 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 16 Dec 23 18:41:34 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     1202749,   Seg_Num: 0
POINT_RA:         39.806d {+02h 39m 13s} (J2000)
POINT_DEC:       +33.597d {+33d 35' 50"} (J2000)
IMG_START_DATE:  20294 TJD;   350 DOY;   23/12/16
IMG_START_TIME:  67073.10 SOD {18:37:53.10} UT,   131.1 [sec] since BAT Trigger Time
COUNTS:          6    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 16 Dec 23 18:42:24 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1202749,   Seg_Num: 0
GRB_RA:           39.759d {+02h 39m 02s} (J2000),
                  40.123d {+02h 40m 29s} (current),
                  39.001d {+02h 36m 00s} (1950)
GRB_DEC:         +33.596d {+33d 35' 45"} (J2000),
                 +33.698d {+33d 41' 53"} (current),
                 +33.381d {+33d 22' 51"} (1950)
GRB_DATE:        20294 TJD;   350 DOY;   23/12/16
GRB_TIME:        66942.03 SOD {18:35:42.03} UT
TRIGGER_INDEX:   42
GRB_PHI:          -8.37 [deg]
GRB_THETA:        38.72 [deg]
DELTA_TIME:      -18.00 [sec]
TRIGGER_DUR:     0.512 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     17.60 [sigma]
IMAGE_SIGNIF:    8.94 [sigma]
LC_URL:          sw01202749000msb.lc
SUN_POSTN:       264.05d {+17h 36m 13s}  -23.32d {-23d 19' 21"}
SUN_DIST:        140.34 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      318.68d {+21h 14m 44s}  -20.94d {-20d 56' 35"}
MOON_DIST:        94.74 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      147.32,-24.13 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       47.91, 17.20 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 9.83,-13.46 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 16 Dec 23 18:45:28 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1202749,   Seg_Num: 0
POINT_RA:         39.806d {+02h 39m 13s} (J2000)
POINT_DEC:       +33.596d {+33d 35' 47"} (J2000)
POINT_ROLL:      273.051d
IMG_START_DATE:  20294 TJD;   350 DOY;   23/12/16
IMG_START_TIME:  67133.39 SOD {18:38:53.39} UT,   191.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.665
N_STARS:         188
X_OFFSET:        475 [pixels]
Y_OFFSET:        162 [pixels]
X_MAX:           1914 [pixels]
Y_MAX:           1601 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw01202749000msufc0191.fits
SUN_POSTN:       264.06d {+17h 36m 14s}  -23.32d {-23d 19' 22"}
SUN_DIST:        140.38 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      318.71d {+21h 14m 51s}  -20.93d {-20d 56' 00"}
MOON_DIST:        94.75 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      147.36,-24.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       47.95, 17.19 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 16 Dec 23 18:45:41 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1202749,   Seg_Num: 0
POINT_RA:         39.806d {+02h 39m 13s} (J2000)
POINT_DEC:       +33.596d {+33d 35' 47"} (J2000)
POINT_ROLL:      273.051d
IMG_START_DATE:  20294 TJD;   350 DOY;   23/12/16
IMG_START_TIME:  67133.39 SOD {18:38:53.39} UT,   191.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.665
N_STARS:         188
X_OFFSET:        475 [pixels]
Y_OFFSET:        162 [pixels]
X_MAX:           1914 [pixels]
Y_MAX:           1601 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw01202749000msufc0191.fits
SUN_POSTN:       264.06d {+17h 36m 14s}  -23.32d {-23d 19' 22"}
SUN_DIST:        140.38 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      318.72d {+21h 14m 52s}  -20.93d {-20d 55' 56"}
MOON_DIST:        94.75 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      147.36,-24.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       47.95, 17.19 [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 16 Dec 23 18:45:33 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     1202749,   Seg_Num: 0
GRB_RA:           39.7729d {+02h 39m 05.49s} (J2000),
                  40.1368d {+02h 40m 32.84s} (current),
                  39.0156d {+02h 36m 03.73s} (1950)
GRB_DEC:         +33.5774d {+33d 34' 38.6"} (J2000),
                 +33.6796d {+33d 40' 46.6"} (current),
                 +33.3622d {+33d 21' 44.0"} (1950)
GRB_ERROR:       4.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  20294 TJD;   350 DOY;   23/12/16
IMG_START_TIME:  67082.00 SOD {18:38:02.00} UT,   140.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       264.06d {+17h 36m 14s}  -23.32d {-23d 19' 22"}
SUN_DIST:        140.35 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      318.71d {+21h 14m 51s}  -20.93d {-20d 55' 58"}
MOON_DIST:        94.72 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      147.34,-24.14 [deg] galactic lon,lat of the burst
ECL_COORDS:       47.91, 17.18 [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 1.1% < P(seren) < 2.8%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 16 Dec 23 18:46:58 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1202749,   Seg_Num: 0
POINT_RA:         39.806d {+02h 39m 13s} (J2000)
POINT_DEC:       +33.596d {+33d 35' 47"} (J2000)
ROLL:            273.051d
IMG_START_DATE:  20294 TJD;   350 DOY;   23/12/16
IMG_START_TIME:  67133.39 SOD {18:38:53.39} UT,   191.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     724444765
X_OFFSET:        1034 [pixels]
Y_OFFSET:        721 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1194
Y_GRB_POS:       881
BINNING_INDEX:   1
IM_URL:          sw01202749000msuni0224.fits
SUN_POSTN:       264.06d {+17h 36m 14s}  -23.32d {-23d 19' 22"}
SUN_DIST:        140.38 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      318.73d {+21h 14m 55s}  -20.93d {-20d 55' 41"}
MOON_DIST:        94.73 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      147.36,-24.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       47.95, 17.19 [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 16 Dec 23 18:47:09 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1202749,   Seg_Num: 0
POINT_RA:         39.806d {+02h 39m 13s} (J2000)
POINT_DEC:       +33.596d {+33d 35' 47"} (J2000)
ROLL:            273.051d
IMG_START_DATE:  20294 TJD;   350 DOY;   23/12/16
IMG_START_TIME:  67133.39 SOD {18:38:53.39} UT,   191.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     724444765
X_OFFSET:        1034 [pixels]
Y_OFFSET:        721 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1194
Y_GRB_POS:       881
BINNING_INDEX:   1
IM_URL:          sw01202749000msuni0224.fits
SUN_POSTN:       264.06d {+17h 36m 14s}  -23.32d {-23d 19' 22"}
SUN_DIST:        140.38 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      318.73d {+21h 14m 55s}  -20.93d {-20d 55' 39"}
MOON_DIST:        94.73 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      147.36,-24.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       47.95, 17.19 [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 #35378
T. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB), S. Dichiara (PSU), M. Ferro (INAF-OAB), J.D. Gropp (PSU), S. Laha (GSFC/UMBC), M. J. Moss (GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), B. Sbarufatti (INAF-OAB) and M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 18:35:42 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 231216A (trigger=1202749). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 39.759, +33.596 which is
```
   RA(J2000) = 02h 39m 02s
   Dec(J2000) = +33d 35' 45"
```
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 70 sec. The peak count rate was ~2000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 18:37:53.1 UT, 131.1 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source located at RA, Dec 39.77287, 33.57671 which is equivalent to:
```
   RA(J2000)  = 02h 39m 05.49s
   Dec(J2000) = +33d 34' 36.2"
```
with an uncertainty of 3.9 arcseconds (radius, 90% containment). This location is 80 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.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 8.36 x 10^20 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 250 seconds with the U filter starting 191 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 33% of the XRT error circle. The typical 3-sigma upper limit has been about 19.2 mag. Results from the list of sources generated on-board are not available at this time. No correction has been made for the expected extinction corresponding to E(B-V) of 0.081.
Burst Advocate for this burst is T. Sbarrato (tullia.sbarrato AT inaf.it). 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 #35379
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 GRB231216.77 (trigger No 1202749,02h 39m 02.16s , +33d 35m 45.6s, R=0.05) errorbox 47 sec after notice time and 382 sec after trigger time at 2023-12-16 18:42:04 UT, with upper limit up to 17.6 mag. Observations started at twilight. The observations began at zenith distance = 66 deg. The sun altitude is -11.7 deg.
The galactic latitude b = -24 deg., longitude l = 148 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2334628
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

     413 |         MASTER-SAAO | P\\ |    60 | 15.6 |        
     473 |         MASTER-SAAO | P\\ |   180 | 16.2 |  Coadd 
     413 |         MASTER-SAAO |  P/ |    60 | 16.8 |        
     492 |         MASTER-SAAO | P\\ |    60 | 15.8 |        
     492 |         MASTER-SAAO |  P/ |    60 | 16.9 |        
     572 |         MASTER-SAAO | P\\ |    60 | 16.1 |        
     572 |         MASTER-SAAO |  P/ |    60 | 17.1 |        
     661 |         MASTER-SAAO | P\\ |    60 | 16.2 |        
     661 |         MASTER-SAAO |  P/ |    60 | 17.2 |        
     741 |         MASTER-SAAO | P\\ |    60 | 16.4 |        
     741 |         MASTER-SAAO |  P/ |    60 | 17.4 |        
     832 |         MASTER-SAAO | P\\ |    60 | 16.5 |        
     832 |         MASTER-SAAO |  P/ |    60 | 17.5 |        
     911 |         MASTER-SAAO | P\\ |    60 | 16.5 |        
     911 |         MASTER-SAAO |  P/ |    60 | 17.5 |        
    1000 |         MASTER-SAAO | P\\ |    60 | 16.4 |        
    1000 |         MASTER-SAAO |  P/ |    60 | 17.6 |        
    1080 |         MASTER-SAAO | P\\ |    60 | 16.6 |        
```
The observation and reduction will continue. The message may be cited.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 16 Dec 23 18:57:39 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1202749,   Seg_Num: 0
POINT_RA:         39.806d {+02h 39m 13s} (J2000)
POINT_DEC:       +33.596d {+33d 35' 47"} (J2000)
POINT_ROLL:      273.051d
IMG_START_DATE:  20294 TJD;   350 DOY;   23/12/16
IMG_START_TIME:  67810.34 SOD {18:50:10.34} UT,   868.3 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.421
N_STARS:         108
X_OFFSET:        475 [pixels]
Y_OFFSET:        162 [pixels]
X_MAX:           1914 [pixels]
Y_MAX:           1601 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw01202749000msufc0868.fits
SUN_POSTN:       264.07d {+17h 36m 16s}  -23.32d {-23d 19' 23"}
SUN_DIST:        140.37 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      318.84d {+21h 15m 21s}  -20.89d {-20d 53' 35"}
MOON_DIST:        94.63 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      147.36,-24.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       47.95, 17.19 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 16 Dec 23 18:57:48 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1202749,   Seg_Num: 0
POINT_RA:         39.806d {+02h 39m 13s} (J2000)
POINT_DEC:       +33.596d {+33d 35' 47"} (J2000)
POINT_ROLL:      273.051d
IMG_START_DATE:  20294 TJD;   350 DOY;   23/12/16
IMG_START_TIME:  67810.34 SOD {18:50:10.34} UT,   868.3 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.421
N_STARS:         108
X_OFFSET:        475 [pixels]
Y_OFFSET:        162 [pixels]
X_MAX:           1914 [pixels]
Y_MAX:           1601 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw01202749000msufc0868.fits
SUN_POSTN:       264.07d {+17h 36m 16s}  -23.32d {-23d 19' 23"}
SUN_DIST:        140.37 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      318.84d {+21h 15m 21s}  -20.89d {-20d 53' 33"}
MOON_DIST:        94.63 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      147.36,-24.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       47.95, 17.19 [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 16 Dec 23 18:58:50 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1202749,   Seg_Num: 0
POINT_RA:         39.806d {+02h 39m 13s} (J2000)
POINT_DEC:       +33.596d {+33d 35' 47"} (J2000)
ROLL:            273.051d
IMG_START_DATE:  20294 TJD;   350 DOY;   23/12/16
IMG_START_TIME:  67810.34 SOD {18:50:10.34} UT,   868.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     724445442
X_OFFSET:        1034 [pixels]
Y_OFFSET:        721 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1194
Y_GRB_POS:       881
BINNING_INDEX:   1
IM_URL:          sw01202749000msuni0901.fits
SUN_POSTN:       264.07d {+17h 36m 16s}  -23.32d {-23d 19' 23"}
SUN_DIST:        140.37 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      318.85d {+21h 15m 24s}  -20.89d {-20d 53' 21"}
MOON_DIST:        94.62 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      147.36,-24.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       47.95, 17.19 [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 16 Dec 23 18:59:05 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1202749,   Seg_Num: 0
POINT_RA:         39.806d {+02h 39m 13s} (J2000)
POINT_DEC:       +33.596d {+33d 35' 47"} (J2000)
ROLL:            273.051d
IMG_START_DATE:  20294 TJD;   350 DOY;   23/12/16
IMG_START_TIME:  67810.34 SOD {18:50:10.34} UT,   868.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     724445442
X_OFFSET:        1034 [pixels]
Y_OFFSET:        721 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1194
Y_GRB_POS:       881
BINNING_INDEX:   1
IM_URL:          sw01202749000msuni0901.fits
SUN_POSTN:       264.07d {+17h 36m 16s}  -23.32d {-23d 19' 23"}
SUN_DIST:        140.37 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      318.85d {+21h 15m 24s}  -20.89d {-20d 53' 18"}
MOON_DIST:        94.62 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      147.36,-24.11 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       47.95, 17.19 [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 16 Dec 23 19:10:59 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     1202749,   Seg_Num: 0
GRB_RA:           39.7729d {+02h 39m 05.49s} (J2000),
                  40.1368d {+02h 40m 32.83s} (current),
                  39.0156d {+02h 36m 03.73s} (1950)
GRB_DEC:         +33.5763d {+33d 34' 34.6"} (J2000),
                 +33.6785d {+33d 40' 42.7"} (current),
                 +33.3611d {+33d 21' 40.1"} (1950)
GRB_ERROR:       3.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  20294 TJD;   350 DOY;   23/12/16
IMG_START_TIME:  67082.00 SOD {18:38:02.00} UT,   140.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       264.08d {+17h 36m 18s}  -23.32d {-23d 19' 24"}
SUN_DIST:        140.34 [deg]   Sun_angle= -9.1 [hr] (East of Sun)
MOON_POSTN:      318.97d {+21h 15m 53s}  -20.85d {-20d 50' 56"}
MOON_DIST:        94.47 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      147.34,-24.14 [deg] galactic lon,lat of the burst
ECL_COORDS:       47.91, 17.18 [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:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 1.1% < P(seren) < 2.8%.

GCN Circular #35381
Y.-D. Hu, E. Fernandez-Garcia, A. J. Castro-Tirado, M.D. Caballero-Garcia, R. Sanchez-Ramirez, I. Perez-Garcia, S.-Y. Wu, S. Guziy (IAA-CSIC), C. Perez del Pulgar, A. Castellon, I. Carrasco, A. Reina (Univ. de Malaga), R. Fernandez-Munoz (IHSM/UMA-CSIC) and M. Jelinek (ASU-CAS), on behalf of a larger collaboration, report:
Following the detection of GRB 231216A by Swift (Sbarrato et al., GCNC 35378), the 0.6m BOOTES-2/TELMA robotic telescope at IHSM La Mayora (UMA-CSIC) in Algarrobo Costa (Malaga, Spain) automatically pointed to the burst position on Dec. 16 at 18:41:57 UT (i.e. ~51 s after notice, 5.3 min after trigger). In the co-added image (28 x 10 s, clear filter), no optical afterglow is detected within the XRT position down to 20.0 mag, which is consistent with both reports from UVOT (Sbarrato et al., GCNC 35378) and MASTER (Lipunov et al. GCNC 35379).
We thank the staff at IHSM/UMA-CSIC La Mayora for their excellent support.
GCN Circular #35382
Daniele B. Malesani (DAWN/NBI and Radboud Univ.), Jacco H. Terwel (TCD and NOT), Benjamin N. Hauptmann (DTU Space and NOT) report on behalf of a larger collaboration:
We observed the position of GRB 231216A (Sbarrato et al., GCN 35378) using the Nordic Optical Telescope equipped with the ALFOSC images. Observations were carried out in the SDSS r and z filters, with an exposure time of 4x200 s in each filter. The delivered seeing in the combined images was around 1.5", and some calima affected the sky transparency.
Within (or near) the current XRT error circle, we detect no new objects down to magnitudes r > 23.5 and z > 21.5 (both AB), with mean times 2.25 and 2.44 hr after the trigger, respectively.
GCN Circular #35383
R. Sharma, V. Swain, V. Bhalerao (IIT Bombay), S. Barway, G. C. Anupama (IIA), K. Angail (IAO)
We observed the field of GRB 231216A detected by Swift (Sbarrato et al., GCN Circ. 35378) with 0.7m GROWTH-India Telescope (GIT). The observations started at 18:59:01.9 UT on 2023-12-16, i.e., 23 minutes after the BAT trigger. We obtained the multiple exposures of 100 and 300 sec in the g' and r' filters. In our stacked images, we did not detect the afterglow within the Swift-XRT position. The obtained upper limits follow as:
```
JD (mid) | t_mid-t0 (hours)| Filter | Exposure (s) | Limiting Magnitude (5 sigma) |

2460295.3278711 | 1.27 | r' | 5100 (stacked) | 22.0 |
2460295.3648310 | 2.16 | g' | 1500 (stacked) | 21.0 |
```
Our results are consistent with the upper limits reported by Global MASTER-Net (Lipunov et al., GCN Circ. 35379), BOOTES-2/TELMA (Hu et al., GCN Circ. 35381) and NOT (Malesani et al., GCN Circ. 35382). The magnitudes are calibrated against PanSTARRS DR1 (Chambers et al., 2016) and not corrected for Galactic extinction.
The GROWTH India Telescope (GIT; Kumar et al. 2022) is a 70-cm telescope with a 0.7-degree field of view, set up by the Indian Institute of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB) with funding from DST-SERB and IUSSTF. It is located at the Indian Astronomical Observatory (Hanle), operated by IIA. We acknowledge funding by the IITB alumni batch of 1994, which partially supports the operations of the telescope. Telescope technical details are available at https://sites.google.com/view/growthindia/.
GCN Circular #35384
S. Basa (OHP/Pyth=C3=A9as/LAM), C. Adami (Pyth=C3=A9as/LAM), Y. Degot-Longhi (OHP/Pyth=C3=A9as), A. Saccardi (GEPI, Obs. de Paris), D. Adrien, E. Le Floc'h, F. Sch=C3=BCssler, D. Turpin (CEA Paris-Saclay), report on behalf of a larger collaboration:
We observed the field of GRB231216A (GCN 35378; Sbarrato et al.) using the T120cm camera at Observatoire de Haute-Provence (France). We began our observations on 2023 16 December 21:37:24 UT (~3h after the trigger time) with a series of R-band (10x300s) images.=20 Last image was taken at 22:37:51 UT.=20
Consistently with Lipunov et al. (GCN 35379), Hu et al. (GCN 35381), Malesani et al. (GCN 35382), and Sharma et al. (GCN 35383), we did not=20 detect any credible optical counterpart to GRB231216A within the GCN 35378 Swift XRT error box.
Using the r-band PanStarr public image, the faintest detected object in our R-band image with a measured PanStarr magnitude is at rMeanPSFMag=3D22.2.
We acknowledge the excellent support from Observatoire de Haute-Provence, in particular Jean Balcaen.
GCN Circular #35387
H. A. Krimm (NSF), S. D. Barthelmy (GSFC), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), M. Moss (GSFC), D. M. Palmer (LANL), T. Parsotan (GSFC/UMBC), T. Sakamoto (AGU), T. Sbarrato (INAF-OAB), M. Stamatikos (OSU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 231216A (trigger #1202749) (Sbarrato, et al., GCN Circ. 35378). The BAT ground-calculated position is RA, Dec = 39.778, 33.614 deg which is
```
   RA(J2000)  =  02h 39m 06.6s
   Dec(J2000) = +33d 36' 48.9"
```
with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 59%.
The mask-weighted light curve shows a structure of multiple pulses. The emission starts from T-5 s, peaks at T0 and ends at T+60 s. T90 (15-350 keV) is 51.2 +- 3.1 sec (estimated error including systematics).
The time-averaged spectrum from T-1.12 to T+51.39 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.63 +- 0.20. The fluence in the 15-150 keV band is 1.0 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-0.51 sec in the 15-150 keV band is 1.8 +- 0.3 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/1202749/BA/
GCN Circular #35388
N. P. M. Kuin (UCL-MSSL) and Sbarrato (INAF-OAB) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 231216A 191 s after the BAT trigger (Sbarrato et al., GCN Circ. 35378). No optical afterglow consistent with the XRT position was 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

u_FC               191          441          246         >20.2
v                  497          814           58         >18.5
b                  447         1028           63         >20.0
u                  191         1018          432         >20.8
w1                 546          864           58         >19.5
m2                 819          839           19         >18.3
w2                 473          790           58         >19.6
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.082 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #35389
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 231216A (Sbarrato et al., GCN 35378) 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 17 at 00:40:48 UT (i.e. about 6.09 hours after the Swift trigger) and lasted for about 1 hour. From preliminary analysis, we do not find any source at the XRT position (Sbarrato et al., GCN 35378), down the the following 3 sigma upper limits:
H > 16.7 (Vega; calibrated against the 2MASS catalogue) at a mid time of t-t0 ~ 6.52 h after the GRB trigger;
K > 16.3 (Vega; calibrated against the 2MASS catalogue) at a mid time of t-t0 ~ 6.61 h after the GRB trigger.
GCN Circular #35390
Tian-Rui Sun (Purple Mountain Observatory), Yan-Long Hua, Mao-Kai Hu, Xue-Feng Wu, Lei Liu, Ke-Lai Meng, Xiao-Yan Li (Nanjing Institute of Astronomical Observation Technology), Xiang-Yan Yuan, Lifan Wang (TAMU), Xiao-Feng Wang (Tsinghua University), Lei Hu (CMU) report on behalf the AST3 Team:
Following the detection of GRB 231216A by Swift (Sbarrato et al., GCNC 35378), we use Antarctic Survey Telescope 3-3 at YaoAn Astronomy Observation Station (China, Yunnan) for follow-up. Our observation started on 2023-12-16T18:44:08 (about 506 seconds after the trigger of BAT (Sbarrato et al., GCNC 35378)). No optical source was detected within the XRT error box down to 20.7 mag in the coadded image (total 600s, g-band).
Our non-detection is consistent with the results from the UVOT (Sbarrato et al., GCN 35378), MASTER (Lipunov et al. GCN 35379), the BOOTES-2/TELMA (Hu et al. GCN 35381), NOT (Daniele B. Malesani et al., GCN 35382) and the T120 at Observatoire de Haute-Provence (Basa et al., GCN 35384)limits.
We thank the staff at YaoAn Astronomy Observation Station for their excellent support.
GCN Circular #35391
B. Sbarufatti (INAF-OAB), C. Salvaggio (INAF-OAB), M. Ferro (INAF-OAB), J. D. Gropp (PSU), S. Dichiara (PSU), J.A. Kennea (PSU), A.P. Beardmore (U. Leicester), J.P. Osborne (U. Leicester) and P.A. Evans report on behalf of the Swift-XRT team:
We have analysed 6.1 ks of XRT data for GRB 231216A, from 115 s to 68.0 ks after the BAT trigger. The data comprise 8 s in Windowed Timing (WT) mode (taken while Swift was slewing), with the remainder in Photon Counting (PC) mode. The refined XRT position is RA, Dec = 39.7727, +33.5764 which is equivalent to:
```
RA (J2000): 02 39 05.45
Dec(J2000): +33 34 35.0
```
with an uncertainty of 3.9 arcsec (radius, 90% confidence).
The light curve can be modelled with a power-law decay with a decay index of alpha=0.7 (+nan, -nan).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.1 (+0.4, -0.3). The best-fitting absorption column is 3.2 (+1.7, -1.4) x 10^21 cm^-2, in excess of the Galactic value of 8.4 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 3.7 x 10^-11 (5.7 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     3.2 (+1.7, -1.4) x 10^21 cm^-2
Galactic foreground: 8.4 x 10^20 cm^-2
Excess significance: 2.8 sigma
Photon index:	     2.1 (+0.4, -0.3)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01202749.
This circular is an official product of the Swift-XRT team.
GCN Circular #35393
K.L. Page (U. Leicester) reports on behalf of the Swift-XRT team:
GCN Circular 35391 omitted the uncertainties on the light curve power-law decay for the Swift-XRT data. The correct value is a decay index of alpha=0.72 (+0.11, -0.09).
If the light curve continues to decay with a power-law decay index of 0.72, the count rate at T+24 hours will be 4.8 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.8 x 10^-13 (2.8 x 10^-13) erg cm^-2 s^-1.
This circular is an official product of the Swift-XRT team.
GCN Circular #35394
Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy in a large collaboration with: M.G. Dainotti (National Astronomical Observatory of Japan), Y. Niino (Tokyo University, Institute of Astronomy), K. Kalinowski (Aarhus University, Department of Physics and Astronomy), B. De Simone (Universita' degli Studi Di Salerno) report:
We image the field of GRB 231216A detected by Swift Burst Alert Telescope (BAT)(trigger 1202749) with telescope of Nastro Verde Observatory - Sorrento (Naples), Italy. Member of: AAVSO - American Association of Variable Star Observers. UAI/SSV - Unione Astrofili Italiani/sezione stelle variabili. AstroCampania Associazione
The observations started at 20:15 UT of 2023/12/16, after 1,40 hours after the GRB trigger, with principal telescope SC 0.35 f/10 with focal reduced + CCD Sbig ST10 XME I took 20 image of 60 sec each. All images are unfiltered, calibrated with masterdark and masterflat,stacked with Tycho Tracker software We have not detected any clearly visible sources, up to 19.5th magnitude in a sky with light clouds and gusts of wind.
```
Start T0+                End T0+        Rlim
20:15:25 UT            20:36:38 UT      19.5
```
We did not found any optical counterpart in the error box of the XRTcandidate. T. Sbarrato et al. GCN 35378
Magnitudes were estimated with the Gaia DR2 cat. and are not corrected for galactic dust extinction.
The message may be cited.
GCN Circular #35395
R. Strausbaugh (Eastern Illinois University), A. Cucchiara (NASA) report on behalf of a larger collaboration:
We observed the Swift GRB 231216A (Sbarrato et al., GCN 35378) field with the LCOGT 1-meter Sinistro instrument at the Teide Observatory, Tenerife site, on December 16, from 19:08 to 19:41 UT (corresponding to 0.55 to 1.10 hours after 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 an uncataloged source within the XRT error region in either band. This result is consistent with other optcal upper limits (Hu et al., GCN 35381; Malesani et al., GCN 35382; Sharma et al., GCN 35383; Basa et al., GCN 35384; Kuin et al., GCN 35388; Sun et al., GCN 35390; Ruocco et al., 35394).
The following 5-sigma upper limits are calculated using the PanSTARRS catalog as reference:
```
r > 22.7
i > 22.1
```
These magnitudes are not corrected for galactic extinction.
GCN Circular #35396
J. An, S.Y. Fu, S.Q. Jiang, X. Liu, Z.P. Zhu, T.H. Lu, D. Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:
We observed the field of GRB 231216A detected by Swift (Sbarrato et al., GCN 35378) using the HMT-0.5m telescope located at Nanshan, Xinjiang, China. Observations started at 18:42:32 UT on 2023-12-16, i.e., 6.83 mins after the Swift/BAT trigger, and a series of 20, 40, 60, 90, 120, 200 s frames were obtained without any filter.
No optical source is detected in our stacked image at the XRT position (Sbarrato et al., GCN 35378), down to the 3-sigma limiting magnitude of m(r) > 20.2 mag (AB) @ 26.03 mins post-burst, calibrated with the nearby PanSTAR field in the Sloan r-filter. The magnitude is not corrected for Galactic extinction.
GCN Circular #35398
Y.-D. Hu, R. Sanchez-Ramirez, A. J. Castro-Tirado, S. Guziy, M.D. Caballero-Garcia, S.-Y. Wu, E. Fernandez-Garcia, and I. Perez-Garcia (IAA-CSIC), F. P=C3=A9rez-Toledo (GTC, IAC), S. B. Pandey (ARIES) and B.-B. Zhang (NJU) on behalf of a larger collaboration, report:
Following the detection of GRB 231216A by Swift (Sbarrato et al., GCNC 35378), we triggered the 10.4m Gran Telescopio de Canarias (GTC) equipped with Optical System for Imaging and low-Intermediate-Resolution Integrated Spectroscopy (OSIRIS) in La Palma (Spain), starting on Dec 16, 20:18 UT (~1.7 h after the trigger). No optical afterglow is indentified within the refined Swift/XRT posiion (Sbarufatti et al. GCNC 35391) which down to i>24.5 mag, which is consistent with these reports from UVOT (Kuin et al., GCNC 35388), MASTER (Lipunov et al. GCNC 35379), NOT (Malesani et al. GCNC 35382), GIT (Sharma et al. GCNC 35383), T120 (Basa et al. GCNC 35384), REM (Ferro et al. GCNC 35389), AST-3 (Sun et al. GCNC 35390), Nastro Verde Observatory (Ruocco et al. GCNC 35394), LCOGT (Strausbaugh et al. GCNC 35395) and Nanshan/HMT (An et al. GCNC 35396).
We thank the staff at GTC for their excellent support.
GCN Circular #35399
A. Reguitti (INAF-OAB / INAF-OAPd), P. D'Avanzo (INAF-OAB), I. Salmaso (INAF -OAPd), E. Cappellaro (INAF -OAPd), report on behalf of the CIBO and of the GRAWITA collaborations:
We observed the field of GRB 231216A (Sbarrato et al., GCN Circ. 35378) from the INAF - Padova Astronomical Observatory located in Asiago (Italy) with the 1.8m Copernico telescope starting on 2023-12-16 at 20:24:48 UT (~ 1.8 hours after the burst). The observations have been carried out with the AFOSC camera in imaging mode using the r filter.
No optical afterglow candidate is detected within the XRT error circle (Sbarufatti et al., GCN Circ .35391) down to a 3sigma limiting magnitude of r ~ 22.0 (AB; calibrated against the PanSTARRS catalogue).
GCN Circular #35401
Claudio Lopresti (Gruppo Astronomia Digitale - GAD Observatory, La Spezia, Italy)
Member of: UAI/SSV - Unione Astrofili Italiani/Sezione Stelle Variabili, GRB section. GAD - Gruppo Astronomia Digitale.
in a large collaboration with: M.G. Dainotti (National Astronomical Observatory of Japan), Y. Niino (Tokyo= University, Institute of Astronomy), K. Kalinowski (Aarhus University, Dep= artment of Physics and Astronomy), B. De Simone (Universita' degli Studi Di= Salerno), Unione Astrofili Italiani (UAI) report:
We imaged the field of GRB 231216A detected by SWIFT(trigger 1202749) with the telescope LX200 12=E2=80=9D of GAD Observatory, La Spezia, Italy
The observations with a series of 60 sec exposures started at 2023-12-16 23= :14:43 UT, 261 min. after the GRB trigger,with a Shmidt-Cassegrain telescop= e D=3D304 mm with reducer F/D=3D4.75. at the following position (+/- 2 arcsec):
```
RA (J2000): 02 39 05.45
Dec(J2000): +33 34 35.0
```
scope D=3D300 mm F/D=3D4.8.
Weather conditions were medium.
We co-added 75 exposures of 60 sec each.
```
Start T0+      End T0+       R lim
261 min        341 min       18
```
We did not found any optical counterpart in 02 39 05.45 +33 34 35.0 position and in the error box of the XRT candidate. ref.: T. Sbarrato et al. GCN 35378
Magnitudes were estimated with the Gaia EDR3 cat. and are not corrected for galactic dust extinction.
Reference: https://www.parcodellestelle.com/
The message may be cited.

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Jochen Greiner, last update: 19-Dec-2023 [Disclaimer]