Gamma-ray Burst 230116D

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 16 Jan 23 21:05:46 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1149293,   Seg_Num: 0
GRB_RA:           98.594d {+06h 34m 23s} (J2000),
                  99.040d {+06h 36m 09s} (current),
                  97.627d {+06h 30m 30s} (1950)
GRB_DEC:         +49.840d {+49d 50' 24"} (J2000),
                 +49.820d {+49d 49' 14"} (current),
                 +49.879d {+49d 52' 46"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       17718 [cnts]    Image_Peak=536 [image_cnts]
TRIGGER_DUR:     12.160 [sec] 
TRIGGER_INDEX:   478     E_range: 25-100 keV
BKG_INTEN:       79754 [cnts]
BKG_TIME:        75785.41 SOD {21:03:05.41} UT
BKG_DUR:         64 [sec]
GRB_DATE:        19960 TJD;    16 DOY;   23/01/16
GRB_TIME:        75883.26 SOD {21:04:43.26} UT
GRB_PHI:         132.29 [deg]
GRB_THETA:        10.59 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     14.10 [sigma]
IMAGE_SIGNIF:    10.08 [sigma]
MERIT_PARAMS:     +1  +0  +0  +4  +2  +0  +0  +0 +83  +0 
SUN_POSTN:       298.49d {+19h 53m 58s}  -20.86d {-20d 51' 20"}
SUN_DIST:        147.19 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
MOON_POSTN:      225.57d {+15h 02m 18s}  -18.10d {-18d 05' 46"}
MOON_DIST:       127.04 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      165.42, 17.81 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       96.19, 26.59 [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 = 353.24,1.63 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 16 Jan 23 21:06:59 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     1149293,   Seg_Num: 0
POINT_RA:         98.581d {+06h 34m 19s} (J2000)
POINT_DEC:       +49.849d {+49d 50' 56"} (J2000)
IMG_START_DATE:  19960 TJD;    16 DOY;   23/01/16
IMG_START_TIME:  76014.13 SOD {21:06:54.13} UT,   130.9 [sec] since BAT Trigger Time
COUNTS:          19    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        2    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:     Mon 16 Jan 23 21:09:45 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1149293,   Seg_Num: 0
POINT_RA:         98.581d {+06h 34m 20s} (J2000)
POINT_DEC:       +49.849d {+49d 50' 56"} (J2000)
POINT_ROLL:      324.266d
IMG_START_DATE:  19960 TJD;    16 DOY;   23/01/16
IMG_START_TIME:  76016.69 SOD {21:06:56.69} UT,   133.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.433
N_STARS:         164
X_OFFSET:        397 [pixels]
Y_OFFSET:        600 [pixels]
X_MAX:           1356 [pixels]
Y_MAX:           1559 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw01149293000msufc0133.fits
SUN_POSTN:       298.49d {+19h 53m 58s}  -20.86d {-20d 51' 18"}
SUN_DIST:        147.18 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
MOON_POSTN:      225.61d {+15h 02m 27s}  -18.11d {-18d 06' 35"}
MOON_DIST:       127.08 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      165.41, 17.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       96.18, 26.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 16 Jan 23 21:09:59 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1149293,   Seg_Num: 0
POINT_RA:         98.581d {+06h 34m 20s} (J2000)
POINT_DEC:       +49.849d {+49d 50' 56"} (J2000)
POINT_ROLL:      324.266d
IMG_START_DATE:  19960 TJD;    16 DOY;   23/01/16
IMG_START_TIME:  76016.69 SOD {21:06:56.69} UT,   133.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.433
N_STARS:         164
X_OFFSET:        397 [pixels]
Y_OFFSET:        600 [pixels]
X_MAX:           1356 [pixels]
Y_MAX:           1559 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw01149293000msufc0133.fits
SUN_POSTN:       298.49d {+19h 53m 58s}  -20.86d {-20d 51' 18"}
SUN_DIST:        147.18 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
MOON_POSTN:      225.61d {+15h 02m 27s}  -18.11d {-18d 06' 38"}
MOON_DIST:       127.08 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      165.41, 17.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       96.18, 26.59 [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:     Mon 16 Jan 23 21:11:15 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1149293,   Seg_Num: 0
POINT_RA:         98.581d {+06h 34m 20s} (J2000)
POINT_DEC:       +49.849d {+49d 50' 56"} (J2000)
ROLL:            324.266d
IMG_START_DATE:  19960 TJD;    16 DOY;   23/01/16
IMG_START_TIME:  76016.69 SOD {21:06:56.69} UT,   133.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     695596047
X_OFFSET:        716 [pixels]
Y_OFFSET:        919 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       876
Y_GRB_POS:       1079
BINNING_INDEX:   1
IM_URL:          sw01149293000msuni0164.fits
SUN_POSTN:       298.49d {+19h 53m 59s}  -20.86d {-20d 51' 17"}
SUN_DIST:        147.18 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
MOON_POSTN:      225.63d {+15h 02m 30s}  -18.12d {-18d 06' 54"}
MOON_DIST:       127.09 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      165.41, 17.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       96.18, 26.59 [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:     Mon 16 Jan 23 21:11:28 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1149293,   Seg_Num: 0
POINT_RA:         98.581d {+06h 34m 20s} (J2000)
POINT_DEC:       +49.849d {+49d 50' 56"} (J2000)
ROLL:            324.266d
IMG_START_DATE:  19960 TJD;    16 DOY;   23/01/16
IMG_START_TIME:  76016.69 SOD {21:06:56.69} UT,   133.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     695596047
X_OFFSET:        716 [pixels]
Y_OFFSET:        919 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       876
Y_GRB_POS:       1079
BINNING_INDEX:   1
IM_URL:          sw01149293000msuni0164.fits
SUN_POSTN:       298.49d {+19h 53m 59s}  -20.86d {-20d 51' 17"}
SUN_DIST:        147.18 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
MOON_POSTN:      225.63d {+15h 02m 31s}  -18.12d {-18d 06' 56"}
MOON_DIST:       127.10 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      165.41, 17.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       96.18, 26.59 [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:     Mon 16 Jan 23 21:11:31 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     1149293,   Seg_Num: 0
GRB_RA:           98.6167d {+06h 34m 28.00s} (J2000),
                  99.0623d {+06h 36m 14.94s} (current),
                  97.6490d {+06h 30m 35.75s} (1950)
GRB_DEC:         +49.8724d {+49d 52' 20.6"} (J2000),
                 +49.8527d {+49d 51' 09.6"} (current),
                 +49.9118d {+49d 54' 42.4"} (1950)
GRB_ERROR:       3.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  19960 TJD;    16 DOY;   23/01/16
IMG_START_TIME:  76067.00 SOD {21:07:47.00} UT,   183.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       298.49d {+19h 53m 59s}  -20.86d {-20d 51' 17"}
SUN_DIST:        147.17 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
MOON_POSTN:      225.63d {+15h 02m 31s}  -18.12d {-18d 06' 57"}
MOON_DIST:       127.07 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      165.40, 17.83 [deg] galactic lon,lat of the burst
ECL_COORDS:       96.20, 26.62 [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 0.11% < P(seren) < 0.58%.

GCN Circular #33175
V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin (Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias),
D. Buckley (South African Astronomical Observatory),
O.A. Gres, N.M. Budnev (Irkutsk State University, API),
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),
A. Gabovich, V.Yurkov (Blagoveschensk Educational State University)
MASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB230116.88 (trigger No 1149293,06h 34m 22.56s , +49d 50m 24.0s, R=0.05) errorbox 48 sec after notice time and 113 sec after trigger time at 2023-01-16 21:06:37 UT, with upper limit up to 17.2 mag. The observations began at zenith distance = 13 deg. The sun altitude is -67.7 deg.
The galactic latitude b = 18 deg., longitude l = 166 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2192694
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

     124 |   MASTER-Kislovodsk |  P- |    20 | 16.9 |        
     157 |   MASTER-Kislovodsk |  P- |    30 | 17.2 |        
```
The observation and reduction will continue. The message may be cited.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 16 Jan 23 21:17:33 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1149293,   Seg_Num: 0
POINT_RA:         98.583d {+06h 34m 20s} (J2000)
POINT_DEC:       +49.850d {+49d 51' 01"} (J2000)
POINT_ROLL:      324.268d
IMG_START_DATE:  19960 TJD;    16 DOY;   23/01/16
IMG_START_TIME:  76174.87 SOD {21:09:34.87} UT,   291.6 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.696
N_STARS:         190
X_OFFSET:        157 [pixels]
Y_OFFSET:        360 [pixels]
X_MAX:           1596 [pixels]
Y_MAX:           1799 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw01149293000msufc0291.fits
SUN_POSTN:       298.50d {+19h 54m 00s}  -20.85d {-20d 51' 14"}
SUN_DIST:        147.18 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
MOON_POSTN:      225.69d {+15h 02m 44s}  -18.14d {-18d 08' 12"}
MOON_DIST:       127.15 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      165.41, 17.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       96.18, 26.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 16 Jan 23 21:17:44 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1149293,   Seg_Num: 0
POINT_RA:         98.583d {+06h 34m 20s} (J2000)
POINT_DEC:       +49.850d {+49d 51' 01"} (J2000)
POINT_ROLL:      324.268d
IMG_START_DATE:  19960 TJD;    16 DOY;   23/01/16
IMG_START_TIME:  76174.87 SOD {21:09:34.87} UT,   291.6 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.696
N_STARS:         190
X_OFFSET:        157 [pixels]
Y_OFFSET:        360 [pixels]
X_MAX:           1596 [pixels]
Y_MAX:           1799 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw01149293000msufc0291.fits
SUN_POSTN:       298.50d {+19h 54m 00s}  -20.85d {-20d 51' 14"}
SUN_DIST:        147.18 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
MOON_POSTN:      225.69d {+15h 02m 45s}  -18.14d {-18d 08' 14"}
MOON_DIST:       127.15 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      165.41, 17.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       96.18, 26.59 [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:     Mon 16 Jan 23 21:18:56 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1149293,   Seg_Num: 0
POINT_RA:         98.583d {+06h 34m 20s} (J2000)
POINT_DEC:       +49.850d {+49d 51' 01"} (J2000)
ROLL:            324.268d
IMG_START_DATE:  19960 TJD;    16 DOY;   23/01/16
IMG_START_TIME:  76174.87 SOD {21:09:34.87} UT,   291.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     695596205
X_OFFSET:        716 [pixels]
Y_OFFSET:        919 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       876
Y_GRB_POS:       1079
BINNING_INDEX:   1
IM_URL:          sw01149293000msuni0322.fits
SUN_POSTN:       298.50d {+19h 54m 00s}  -20.85d {-20d 51' 14"}
SUN_DIST:        147.18 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
MOON_POSTN:      225.70d {+15h 02m 48s}  -18.14d {-18d 08' 29"}
MOON_DIST:       127.16 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      165.41, 17.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       96.18, 26.59 [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:     Mon 16 Jan 23 21:19:11 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1149293,   Seg_Num: 0
POINT_RA:         98.583d {+06h 34m 20s} (J2000)
POINT_DEC:       +49.850d {+49d 51' 01"} (J2000)
ROLL:            324.268d
IMG_START_DATE:  19960 TJD;    16 DOY;   23/01/16
IMG_START_TIME:  76174.87 SOD {21:09:34.87} UT,   291.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     695596205
X_OFFSET:        716 [pixels]
Y_OFFSET:        919 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       876
Y_GRB_POS:       1079
BINNING_INDEX:   1
IM_URL:          sw01149293000msuni0322.fits
SUN_POSTN:       298.50d {+19h 54m 00s}  -20.85d {-20d 51' 13"}
SUN_DIST:        147.18 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
MOON_POSTN:      225.70d {+15h 02m 48s}  -18.14d {-18d 08' 32"}
MOON_DIST:       127.16 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      165.41, 17.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       96.18, 26.59 [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:     Mon 16 Jan 23 21:18:50 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     1149293,   Seg_Num: 0
GRB_RA:           98.6170d {+06h 34m 28.08s} (J2000),
                  99.0626d {+06h 36m 15.02s} (current),
                  97.6493d {+06h 30m 35.82s} (1950)
GRB_DEC:         +49.8724d {+49d 52' 20.6"} (J2000),
                 +49.8527d {+49d 51' 09.6"} (current),
                 +49.9118d {+49d 54' 42.4"} (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:  19960 TJD;    16 DOY;   23/01/16
IMG_START_TIME:  76067.00 SOD {21:07:47.00} UT,   183.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       298.50d {+19h 54m 00s}  -20.85d {-20d 51' 14"}
SUN_DIST:        147.17 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
MOON_POSTN:      225.70d {+15h 02m 47s}  -18.14d {-18d 08' 27"}
MOON_DIST:       127.13 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      165.40, 17.83 [deg] galactic lon,lat of the burst
ECL_COORDS:       96.20, 26.62 [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 0.11% < P(seren) < 0.58%.

GCN Circular #33176
E. Sonbas (Adiyaman Univ.), R. A. J. Eyles-Ferris (U Leicester), C. Gronwall (PSU), J.D. Gropp (PSU), N. J. Klingler (GSFC/UMBC/CRESSTII), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), K. L. Page (U Leicester), D. M. Palmer (LANL), T. Sakamoto (AGU) and M. A. Williams (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 21:04:43 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 230116D (trigger=1149293). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 98.594, 49.840d which is
```
   RA(J2000) = 06h 34m 23s
   Dec(J2000) =  +49d 50' 24"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). Due to a communications gap the BAT lightcurve before T+8 s is not immediately available, but the later lightcurve indicates activity out to at least T+30 s.
The XRT began observing the field at 21:06:54.1 UT, 130.9 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 98.61709, 49.87257 which is equivalent to:
```
   RA(J2000)  = 06h 34m 28.10s
   Dec(J2000) = +49d 52' 21.3"
```
with an uncertainty of 1.9 arcseconds (radius, 90% containment). This location is 128 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 1.65 x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 133 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 none of the XRT error circle. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.112.
Burst Advocate for this burst is E. Sonbas (edasonbas AT yahoo.com). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 16 Jan 23 21:23:26 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1149293,   Seg_Num: 0
POINT_RA:         98.583d {+06h 34m 20s} (J2000)
POINT_DEC:       +49.850d {+49d 51' 01"} (J2000)
POINT_ROLL:      324.268d
IMG_START_DATE:  19960 TJD;    16 DOY;   23/01/16
IMG_START_TIME:  76754.44 SOD {21:19:14.44} UT,   871.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.291
N_STARS:         190
X_OFFSET:        157 [pixels]
Y_OFFSET:        360 [pixels]
X_MAX:           1596 [pixels]
Y_MAX:           1799 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw01149293000msufc0871.fits
SUN_POSTN:       298.50d {+19h 54m 01s}  -20.85d {-20d 51' 11"}
SUN_DIST:        147.17 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
MOON_POSTN:      225.74d {+15h 02m 58s}  -18.16d {-18d 09' 24"}
MOON_DIST:       127.19 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      165.41, 17.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       96.18, 26.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 16 Jan 23 21:25:00 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1149293,   Seg_Num: 0
POINT_RA:         98.583d {+06h 34m 20s} (J2000)
POINT_DEC:       +49.850d {+49d 51' 01"} (J2000)
ROLL:            324.268d
IMG_START_DATE:  19960 TJD;    16 DOY;   23/01/16
IMG_START_TIME:  76754.44 SOD {21:19:14.44} UT,   871.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     695596785
X_OFFSET:        716 [pixels]
Y_OFFSET:        919 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       876
Y_GRB_POS:       1079
BINNING_INDEX:   1
IM_URL:          sw01149293000msuni0902.fits
SUN_POSTN:       298.50d {+19h 54m 01s}  -20.85d {-20d 51' 11"}
SUN_DIST:        147.17 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
MOON_POSTN:      225.75d {+15h 03m 01s}  -18.16d {-18d 09' 44"}
MOON_DIST:       127.21 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      165.41, 17.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       96.18, 26.59 [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:     Mon 16 Jan 23 21:25:05 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1149293,   Seg_Num: 0
POINT_RA:         98.583d {+06h 34m 20s} (J2000)
POINT_DEC:       +49.850d {+49d 51' 01"} (J2000)
ROLL:            324.268d
IMG_START_DATE:  19960 TJD;    16 DOY;   23/01/16
IMG_START_TIME:  76754.44 SOD {21:19:14.44} UT,   871.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     695596785
X_OFFSET:        716 [pixels]
Y_OFFSET:        919 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       876
Y_GRB_POS:       1079
BINNING_INDEX:   1
IM_URL:          sw01149293000msuni0902.fits
SUN_POSTN:       298.50d {+19h 54m 01s}  -20.85d {-20d 51' 11"}
SUN_DIST:        147.17 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
MOON_POSTN:      225.76d {+15h 03m 01s}  -18.16d {-18d 09' 45"}
MOON_DIST:       127.21 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      165.41, 17.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       96.18, 26.59 [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:     Mon 16 Jan 23 21:23:36 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1149293,   Seg_Num: 0
POINT_RA:         98.583d {+06h 34m 20s} (J2000)
POINT_DEC:       +49.850d {+49d 51' 01"} (J2000)
POINT_ROLL:      324.268d
IMG_START_DATE:  19960 TJD;    16 DOY;   23/01/16
IMG_START_TIME:  76754.44 SOD {21:19:14.44} UT,   871.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.291
N_STARS:         190
X_OFFSET:        157 [pixels]
Y_OFFSET:        360 [pixels]
X_MAX:           1596 [pixels]
Y_MAX:           1799 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw01149293000msufc0871.fits
SUN_POSTN:       298.50d {+19h 54m 01s}  -20.85d {-20d 51' 11"}
SUN_DIST:        147.17 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
MOON_POSTN:      225.74d {+15h 02m 58s}  -18.16d {-18d 09' 26"}
MOON_DIST:       127.20 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      165.41, 17.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       96.18, 26.59 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #33177
Z.P. Zhu (NAOC, HUST), D. Xu, S.Q. Jiang, S.Y. Fu, X. Liu, T.H. Lu (NAOC), X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:
We observed the field of GRB 230116B detected by Swift (Sonbas et al., GCN 33176) using the NEXT-0.6m telescope located at Nanshan, Xinjiang, China. Observations started at 21:06:37 UT on 2023-01-16, i.e., 114 s after the Swift/BAT trigger. A series of frames in the Sloan r- and z- filters were obtained.
An uncatalogued and decaying optical transient is detected at the Swift/XRT position (Sonbas et al., GCN 33176) at coordinates
```
R.A. (J2000) = 6:34:28.21
Dec. (J2000) = +49:52:20.38
```
with a positional uncertainty of ~0.3 arcsec and r ~ 19.1 mag at ~189 s after the BAT trigger. We thus conclude that the transient is the afterglow of the burst.
GCN Circular #33178
S. Nazarov (CrAO), A. Pozanenko (IKI), S. Belkin (IKI, HSE), N. Pankov (HSE) report on behalf of IKI GRB FuN:
We observed GRB 230116D (Sonbas et al., GCN 33176) with Sintez-Newton telescope of CrAO observatory. Observation started on 2023-01-16 (UT) 21:21:41. The series consists of images with an exposure of 120 s in Clear filter.
In the first images we detect an object in coordinates (J2000) 06:34:28.01 +49:52:20.35 (with uncertainties of 0.5 arcsec) which is within of the XRT error circle (Sonbas et al., GCN 33176). Preliminary photometry of the afterglow is 19.5 at (UT) 21:41:56. The photometry is based on nearby USNO-B1.0 (R2) stars. There is no object in PS1 and DSS2 catalogues at this coordinates. Therefore we suggest the object is the afterglow of GRB 230116D. Observation is continuing.
GCN Circular #33179
A. S. Moskvitin, O. I. Spiridonova and O. A. Maslennikova (SAO RAS), report on behalf of the GRB follow-up team.
We observed the field of the GRB 230116D (Sonbas et al. GCN #33176) with the SAO RAS 1-m telescope Zeiss-1000 + CCD-photometer in Rc band.
Inside the XRT error circle we detected new transient object reported by Zhu et al. (GCN #33177) and Nazarov et al. (GCN #33178) with the coordinates
```
R.A. = 06:34:28.2
Dec. = +49:52:20.5 (+/- 0".3, J2000) and brightness
R = 19.93 +/- 0.07 (T - T0 = 0.9378h),
R = 19.72 +/- 0.06 (T - T0 = 1.4236h)
```
Preliminary photometry is based on R2 magnitudes of nearby USNO-B1 stars.
Further observations are ongoing and encouraged.
GCN Circular #33180
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 1618 s of XRT Photon Counting mode data and 3 UVOT images for GRB 230116D, 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 = 98.61719, +49.87240 which is equivalent to:
```
RA (J2000): 06h 34m 28.13s
Dec (J2000): +49d 52' 20.6"
```
with an uncertainty of 2.3 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 #33181

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GCN Circular #33182
V. Swain (IITB), H. Kumar (IITB), K. Angail (IAO), V. Bhalerao (IITB), G. C. Anupama(IIA), S. Barway (IIA) report on behalf of the GIT team:
[The previous GCN was garbled up, re-posting]
We observed GRB 230116D detected by Swift-BAT (Sonbas et al., GCN 33176) and optical afterglow discovered by Z.P. Zhu et al.(GCN 33177), with 0.7m GROWTH-India Telescope (GIT). We started the observation at 21:39:00 UT on 2023-01-16, i.e., 34.28 min after the Swift/BAT trigger and took multiple exposures in the g’, r' and i’ filters. We clearly detected the afterglow in our stacked image at R.A.= 06:34:28.13, DEC.=+49:52:20.6, within the 2.3 arcsec radius circle (J.P. Osborne et al., GCN 33180). The photometric results follow as:
```
-------------------------------------------------------------------
 JD (mid) | T_mid-T0(hrs) | Exposure (sec) | Filter | Magnitude (AB) |
-------------------------------------------------------------------
 2459961.40208328 | 0.57 | 1 x 20           | r' | >17.63 |
 2459961.41763334 | 0.94 | 8 x 300 (stacked) | g’ | 21.04 +/- 0.07 |
 2459961.44794164 | 1.67 | 8 x 300 (stacked) | r’ | 19.99 +/- 0.05 |
 2459961.47255148 | 2.26 | 5 x 300 (stacked) | i’ | >19.84 |
-------------------------------------------------------------------
```
The results are consistent with S. Nazarov et al.(GCN #33178) and A. S. Moskvitin et al.(GCN #33179).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 telescope’s operations. Telescope technical details are available at https://sites.google.com/view/growthindia/.
GCN Circular #33185
D.N. Burrows (PSU), J. D. Gropp (PSU), S. Dichiara (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), V. D'Elia (SSDC & INAF-OAR), B. Sbarufatti (INAF-OAB), A. D'Ai (INAF-IASFPA) and E. Sonbas report on behalf of the Swift-XRT team:
We have analysed 6.7 ks of XRT data for GRB 230116D (Sonbas et al. GCN Circ. 33176), from 113 s to 40.1 ks after the BAT trigger. The data comprise 47 s in Windowed Timing (WT) mode (the first 10 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN Circ. 33180).
The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=1.87 (+0.28, -0.19). At T+559 s the decay flattens to an alpha of 0.72 (+0.10, -0.28) before breaking again at T+11.3 ks to a final decay with index alpha=2.4 (+2.5, -0.8).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.75 (+0.20, -0.09). The best-fitting absorption column is consistent with the Galactic value of 1.6 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 3.9 x 10^-11 (4.8 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.6 (+/-0.5) x 10^21 cm^-2
Galactic foreground: 1.6 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.75 (+0.20, -0.09)
```
If the light curve continues to decay with a power-law decay index of 2.4, the count rate at T+24 hours will be 5.1 x 10^-4 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.0 x 10^-14 (2.4 x 10^-14) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01149293.
This circular is an official product of the Swift-XRT team.
GCN Circular #33187
A. Moskvitin (SAO RAS), A. Pozanenko (IKI), A. Moiseev (SAO RAS), D. Oparin (SAO RAS), S. Belkin (IKI, HSE) report on behalf of larger collaboration:
We observed the optical afterglow (Zhu et al., GCN 33177; Nazarov et al., GCN 33178; Moskvitin et al., GCN 33179; Swain et al., GCN 33182) of GRB 230116D (Sonbas et al., GCN 33176) with BTA SAO RAS telescope equipped with SCORPIO-2. Observation started on 2023-01-16 (UT) 23:31:38. Spectroscopic observations consists of 10x600 s exposures with 940@600 grizm.
We detect a sharp break at 5850 AA and afterglow continuum up to 7200 AA. We interpret the sharp break due to H I. Over the continuum we identified multiple absorption features, which we interpret as due to S II, Si II, O I, C II, Si IV at a common redshift of z = 3.81.
GCN Circular #33188
R. Strausbaugh (University of Minnesota), A. Cucchiara (NASA) report on behalf of a larger collaboration:
We observed the GRB 230116D (Sonbas et al., GCN 33176) field with the LCOGT 1-meter Sinistro instrument at the McDonald Observatory, TX, USA site, on January 17, from 05:24 to 05:56 UT (corresponding to 8.33 to 8.64 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 in either band within the XRT enhanced error region (Osborne et al., GCN 33180). This suggests fading compared to other optical detections (Zhu et al., GCN 33177; Nazarov et al., GCN 33178; Moskvitin et al., GCN 33179; Swain et al., 33182).
The following magnitudes and upper limits are calculated using the PanSTARRS catalog as reference:
```
r > 22.2
i > 21.2
```
These magnitudes are not corrected for galactic extinction.
GCN Circular #33189
S. Belkin (IKI, HSE), S. Nazarov (CrAO), A. Pozanenko (IKI), N. Pankov (HSE, IKI) report on behalf of GRB IKI FuN:
We observed the optical afterglow (Zhu et al., GCN 33177; Nazarov et al., GCN 33178; Moskvitin et al. GCNs 33179, 33187; Swain et al., GCN 33182) of GRB 230116D (Sonbas et al., GCN 33176) with Sintez-Newton telescope of CrAO observatory. Observation started on 2023-01-16 (UT) 21:21:41. The series consist of images with an exposure of 120 s in Clear filter. Preliminary photometry of the stacked images is following
```
Date UT-start       Exptime Filter t-T0     OT     Err     UL
2023-01-16 21:23:55 35*120  Clear  0.03764  19.82  0.08    22.5
2023-01-16 22:44:52 33*120  Clear  0.09245  19.97  0.16    21.9
```
Ref.stars USNO-B1.0
```
RA DEC R2

06:34:04.9708800 +49:53:05.863200 15.61
06:34:38.7820800 +49:49:22.972800 16.29
06:34:57.9967200 +49:53:01.932000 16.94
06:34:24.5268000 +49:47:49.801200 15.68
```
GCN Circular #33190
S. Belkin (IKI, HSE), A. V. Samokhvalov (citizen scientist, Surgut), A. Pozanenko (IKI), N. Pankov (HSE, IKI) report on behalf of GRB IKI FuN:
We observed the optical afterglow (Zhu et al., GCN 33177; Nazarov et al., GCN 33178; Moskvitin et al. GCNs 33179, 33187; Swain et al., GCN 33182; Belkin et al., GCN 33189) of GRB 230116D (Sonbas et al., GCN 33176) with 25cm 1/8 Ritchey-Chretien telescope of KGO observatory. Observation started on 2023-01-16 (UT) 21:21:41. The series consist of images with an exposure of 600 s in R-filter. Preliminary photometry of the stacked image is following
```
Date UT-start       Exptime Filter t-T0     OT     Err    UL
2023-01-16 23:36:12 11*600  R      0.16075  20.25  0.20   20.4
```
> Ref.stars USNO-B1.0
```
RA DEC R2

06:34:04.9708800 +49:53:05.863200 15.61
06:34:38.7820800 +49:49:22.972800 16.29
06:34:57.9967200 +49:53:01.932000 16.94
06:34:24.5268000 +49:47:49.801200 15.68
```
GCN Circular #33191
S. Belkin (IKI, HSE), A. Moskvitin (SAO RAS), A. Pozanenko (IKI), A. Moiseev (SAO RAS), D. Oparin (SAO RAS), N. Pankov (HSE, IKI) report on behalf of GRB IKI FuN:
We observed the optical afterglow (Zhu et al., GCN 33177; Nazarov et al., GCN 33178; Moskvitin et al. GCNs 33179, 33187; Swain et al., GCN 33182; Belkin et al., GCNs 33189, 33190) of GRB 230116D (Sonbas et al., GCN 33176) with BTA SAO RAS telescope equipped with SCORPIO-2. Observation started on 2023-01-16 (UT) 23:31:38. Photometric observations consists of r -filter acquisition imaging and g,r,i - filters after before spectroscopy (Moskvitin et al. GCN 33187). Preliminary photometry of stacked images is following
```
Date       UT-start Exptime Filter t-T0     OT     Err    UL
2023-01-16 23:31:48 2*20    r      0.10951  20.29  0.05   21.4
2023-01-17 01:33:17 2*90    r      0.18859  20.97  0.04   23.2
2023-01-17 01:30:43 3*120   g      0.18935  22.18  0.08   23.1
```
Ref.stars PanSTARRS-PS1
```
RA DEC g r i z
06:34:21.9567816 +49:52:11.318772 16.3946 15.7833 15.5155 15.3912
06:34:23.9012808 +49:51:55.541160 18.8105 18.2189 17.9721 17.8591
06:34:37.7805360 +49:50:45.780468 18.3294 17.6554 17.3783 17.2518
```
The light curve based on afterglow observations (GCNs 33177, 33178, 33179, 33187, 33188, 33182, 33189, 33190) can be found at http://grb.rssi.ru/GRB230116D/GRB230116D_lc_1.png
The light curve confirms rebrightening (Moskvitin et al. GCN 33179) or plateau at 0.03 - 0.1 days and correlate with XRT LC (https://www.swift.ac.uk/xrt_curves/01149293/).
GCN Circular #33192
A. S. Moskvitin, O. I. Spiridonova and O. A. Maslennikova (SAO RAS), report on behalf of the GRB follow-up team.
We observed the field of the GRB 230116D (Sonbas et al. GCN #33176) with the SAO RAS 1-m telescope Zeiss-1000 + CCD-photometer in Rc band on January 16/17 (21:55:22--00:36:40 UT) and 17/18 (21:42:43--23:31:38).
During the first night the optical afterglow (Zhu et al., GCN #33177; Nazarov et al., GCN #33178; Moskvitin et al. GCNs #33179, #33187; Swain et al., GCN #33182; Belkin et al., GCNs #33189, #33190, #33191) was clearly detected in individual frames and shows complex behaviour.
```
t-T0, h    R_mag  +/- err     exp, s
0.844      19.967 +/- 0.070   300
0.948      19.888 +/- 0.068   300
1.045      19.874 +/- 0.066   300
1.138      19.818 +/- 0.063   300
1.233      19.674 +/- 0.057   300
1.332      19.595 +/- 0.051   300
1.432      19.701 +/- 0.055   300
1.526      19.668 +/- 0.056   300
1.623      19.779 +/- 0.062   300
1.717      19.764 +/- 0.063   300
1.820      19.728 +/- 0.058   300
1.924      19.626 +/- 0.055   300
2.022      19.539 +/- 0.052   300
2.130      19.709 +/- 0.064   300
2.226      19.798 +/- 0.070   300
2.346      19.870 +/- 0.078   300
2.444      19.976 +/- 0.083   300
2.644      20.021 +/- 0.086   300
2.835      20.065 +/- 0.066   2 x 300
3.041      20.032 +/- 0.063   2 x 300
3.241      20.138 +/- 0.062   2 x 300
3.441      20.223 +/- 0.075   2 x 300
```
We also obtained 17 x 300 images in Rc band during the second night. The OT is detected in the stacked frame with the brightness of R = 22.9 +/- 0.2 (t-T0 = 25.541h = 1.064d) which is in agreement with upper limit reported by Strausbaugh & Cucchiara (GCN #33188). Preliminary photometry is based on R2 magnitudes of nearby USNO-B1 stars.
GCN Circular #33194
C. B. Markwardt (GSFC),S. D. Barthelmy (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), D. M. Palmer (LANL), T. Parsotan (GSFC/UMBC),T. Sakamoto (AGU), M. Stamatikos (OSU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 230116D (trigger #1149293) (Sonbas et al., GCN Circ. 33176). The BAT ground-calculated position is RA, Dec = 98.584, 49.831 deg which is
```
   RA(J2000)  =  06h 34m 20.1s
   Dec(J2000) = +49d 49' 50.3"
```
with an uncertainty of 2.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 98%.
The BAT light curve showed a complex structure with a duration of about 40 sec. T90 (15-350 keV) is 41.00 +- 11.18 sec (estimated error including systematics).
The time-averaged spectrum from T+1.14 to T+53.144 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.38 +- 0.22. The fluence in the 15-150 keV band is 8.12 +- 1.2 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+12.14 sec in the 15-150 keV band is 0.6 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/1149293/BA/
GCN Circular #33198
Rahul Gupta, Amit K. Ror, S. B. Pandey, A. Aryan, S. Pandey, A. Ghosh, Dimple, and K. Misra (ARIES) report:
We observed the field of GRB 230116D detected by Swift (Sonbas et al., GCN 33176) using the 3.6m Devasthal Optical Telescope of ARIES Nainital. We have taken multiple frames having an exposure time of 300 sec in the r filter. We stacked the images after the alignment. We do not detect the optical afterglow (Zhu et al., GCN 33177; Nazarov et al., GCN 33178; Moskvitin et al., GCNs 33179, 33187, 33192; Swain et al., GCN 33182; and Belkin et al., GCNs 33189, 33190, 33191). We obtained the limiting mag of ~ 22.7 mag at ~ 1.04 days post-detection.
The limiting magnitudes quoted are not corrected for the Galactic and host 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.

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Jochen Greiner, last update: 20-Jan-2023 [Disclaimer]