Gamma-ray Burst 230816A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 16 Aug 23 16:09:06 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1185673,   Seg_Num: 0
GRB_RA:          328.375d {+21h 53m 30s} (J2000),
                 328.624d {+21h 54m 30s} (current),
                 327.848d {+21h 51m 24s} (1950)
GRB_DEC:         +37.828d {+37d 49' 43"} (J2000),
                 +37.941d {+37d 56' 26"} (current),
                 +37.592d {+37d 35' 32"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       3455 [cnts]    Image_Peak=168 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       20578 [cnts]
BKG_TIME:        58112.16 SOD {16:08:32.16} UT
BKG_DUR:         8 [sec]
GRB_DATE:        20172 TJD;   228 DOY;   23/08/16
GRB_TIME:        58128.29 SOD {16:08:48.29} UT
GRB_PHI:         142.61 [deg]
GRB_THETA:        12.71 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     15.03 [sigma]
IMAGE_SIGNIF:    7.42 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  -2  +0  +0 +62  +0 
SUN_POSTN:       145.87d {+09h 43m 30s}  +13.67d {+13d 40' 06"}
SUN_DIST:        128.33 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      150.35d {+10h 01m 25s}  +16.76d {+16d 45' 31"}
MOON_DIST:       125.28 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.35,-12.82 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      348.57, 46.67 [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 = 107.54,17.92 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 16 Aug 23 16:10:25 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     1185673,   Seg_Num: 0
POINT_RA:        328.390d {+21h 53m 34s} (J2000)
POINT_DEC:       +37.834d {+37d 50' 04"} (J2000)
IMG_START_DATE:  20172 TJD;   228 DOY;   23/08/16
IMG_START_TIME:  58218.45 SOD {16:10:18.45} UT,   90.2 [sec] since BAT Trigger Time
COUNTS:          10    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:     Wed 16 Aug 23 16:13:05 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1185673,   Seg_Num: 0
GRB_RA:          328.375d {+21h 53m 30s} (J2000),
                 328.624d {+21h 54m 30s} (current),
                 327.848d {+21h 51m 24s} (1950)
GRB_DEC:         +37.828d {+37d 49' 43"} (J2000),
                 +37.941d {+37d 56' 26"} (current),
                 +37.592d {+37d 35' 32"} (1950)
GRB_DATE:        20172 TJD;   228 DOY;   23/08/16
GRB_TIME:        58128.29 SOD {16:08:48.29} UT
TRIGGER_INDEX:   146
GRB_PHI:         142.61 [deg]
GRB_THETA:        12.71 [deg]
DELTA_TIME:      -11.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     15.03 [sigma]
IMAGE_SIGNIF:    7.42 [sigma]
LC_URL:          sw01185673000msb.lc
SUN_POSTN:       145.88d {+09h 43m 30s}  +13.67d {+13d 40' 03"}
SUN_DIST:        128.33 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      150.39d {+10h 01m 33s}  +16.75d {+16d 44' 45"}
MOON_DIST:       125.29 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.35,-12.82 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      348.57, 46.67 [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 = 107.54,17.92 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 16 Aug 23 16:13:22 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1185673,   Seg_Num: 0
POINT_RA:        328.389d {+21h 53m 33s} (J2000)
POINT_DEC:       +37.834d {+37d 50' 02"} (J2000)
POINT_ROLL:      3.120d
IMG_START_DATE:  20172 TJD;   228 DOY;   23/08/16
IMG_START_TIME:  58221.88 SOD {16:10:21.88} UT,   93.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.987
N_STARS:         140
X_OFFSET:        386 [pixels]
Y_OFFSET:        503 [pixels]
X_MAX:           1345 [pixels]
Y_MAX:           1462 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw01185673000msufc0093.fits
SUN_POSTN:       145.88d {+09h 43m 30s}  +13.67d {+13d 40' 03"}
SUN_DIST:        128.32 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      150.39d {+10h 01m 33s}  +16.74d {+16d 44' 42"}
MOON_DIST:       125.28 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.36,-12.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.58, 46.67 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 16 Aug 23 16:13:37 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1185673,   Seg_Num: 0
POINT_RA:        328.389d {+21h 53m 33s} (J2000)
POINT_DEC:       +37.834d {+37d 50' 02"} (J2000)
POINT_ROLL:      3.120d
IMG_START_DATE:  20172 TJD;   228 DOY;   23/08/16
IMG_START_TIME:  58221.88 SOD {16:10:21.88} UT,   93.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.987
N_STARS:         140
X_OFFSET:        386 [pixels]
Y_OFFSET:        503 [pixels]
X_MAX:           1345 [pixels]
Y_MAX:           1462 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw01185673000msufc0093.fits
SUN_POSTN:       145.88d {+09h 43m 31s}  +13.67d {+13d 40' 03"}
SUN_DIST:        128.32 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      150.39d {+10h 01m 34s}  +16.74d {+16d 44' 39"}
MOON_DIST:       125.28 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.36,-12.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.58, 46.67 [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:     Wed 16 Aug 23 16:14:48 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1185673,   Seg_Num: 0
POINT_RA:        328.389d {+21h 53m 33s} (J2000)
POINT_DEC:       +37.834d {+37d 50' 02"} (J2000)
ROLL:            3.120d
IMG_START_DATE:  20172 TJD;   228 DOY;   23/08/16
IMG_START_TIME:  58221.88 SOD {16:10:21.88} UT,   93.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     713895053
X_OFFSET:        705 [pixels]
Y_OFFSET:        822 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       865
Y_GRB_POS:       982
BINNING_INDEX:   1
IM_URL:          sw01185673000msuni0125.fits
SUN_POSTN:       145.88d {+09h 43m 31s}  +13.67d {+13d 40' 02"}
SUN_DIST:        128.32 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      150.40d {+10h 01m 36s}  +16.74d {+16d 44' 25"}
MOON_DIST:       125.29 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.36,-12.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.58, 46.67 [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:     Wed 16 Aug 23 16:14:53 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1185673,   Seg_Num: 0
POINT_RA:        328.389d {+21h 53m 33s} (J2000)
POINT_DEC:       +37.834d {+37d 50' 02"} (J2000)
ROLL:            3.120d
IMG_START_DATE:  20172 TJD;   228 DOY;   23/08/16
IMG_START_TIME:  58221.88 SOD {16:10:21.88} UT,   93.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     713895053
X_OFFSET:        705 [pixels]
Y_OFFSET:        822 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       865
Y_GRB_POS:       982
BINNING_INDEX:   1
IM_URL:          sw01185673000msuni0125.fits
SUN_POSTN:       145.88d {+09h 43m 31s}  +13.67d {+13d 40' 02"}
SUN_DIST:        128.32 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      150.40d {+10h 01m 36s}  +16.74d {+16d 44' 24"}
MOON_DIST:       125.29 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.36,-12.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.58, 46.67 [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:     Wed 16 Aug 23 16:14:54 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     1185673,   Seg_Num: 0
GRB_RA:          328.4446d {+21h 53m 46.70s} (J2000),
                 328.6939d {+21h 54m 46.52s} (current),
                 327.9177d {+21h 51m 40.24s} (1950)
GRB_DEC:         +37.8543d {+37d 51' 15.4"} (J2000),
                 +37.9665d {+37d 57' 59.4"} (current),
                 +37.6177d {+37d 37' 03.8"} (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:  20172 TJD;   228 DOY;   23/08/16
IMG_START_TIME:  58225.00 SOD {16:10:25.00} UT,   96.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       145.88d {+09h 43m 31s}  +13.67d {+13d 40' 02"}
SUN_DIST:        128.30 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      150.40d {+10h 01m 36s}  +16.74d {+16d 44' 24"}
MOON_DIST:       125.27 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.41,-12.83 [deg] galactic lon,lat of the burst
ECL_COORDS:      348.65, 46.67 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 16 Aug 23 16:20:49 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1185673,   Seg_Num: 0
POINT_RA:        328.391d {+21h 53m 34s} (J2000)
POINT_DEC:       +37.834d {+37d 50' 04"} (J2000)
POINT_ROLL:      3.122d
IMG_START_DATE:  20172 TJD;   228 DOY;   23/08/16
IMG_START_TIME:  58434.40 SOD {16:13:54.40} UT,   306.1 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.605
N_STARS:         190
X_OFFSET:        146 [pixels]
Y_OFFSET:        263 [pixels]
X_MAX:           1585 [pixels]
Y_MAX:           1702 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw01185673000msufc0306.fits
SUN_POSTN:       145.88d {+09h 43m 32s}  +13.67d {+13d 39' 57"}
SUN_DIST:        128.32 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      150.45d {+10h 01m 47s}  +16.72d {+16d 43' 16"}
MOON_DIST:       125.31 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.36,-12.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.59, 46.67 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 16 Aug 23 16:21:08 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1185673,   Seg_Num: 0
POINT_RA:        328.391d {+21h 53m 34s} (J2000)
POINT_DEC:       +37.834d {+37d 50' 04"} (J2000)
POINT_ROLL:      3.122d
IMG_START_DATE:  20172 TJD;   228 DOY;   23/08/16
IMG_START_TIME:  58434.40 SOD {16:13:54.40} UT,   306.1 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.605
N_STARS:         190
X_OFFSET:        146 [pixels]
Y_OFFSET:        263 [pixels]
X_MAX:           1585 [pixels]
Y_MAX:           1702 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw01185673000msufc0306.fits
SUN_POSTN:       145.88d {+09h 43m 32s}  +13.67d {+13d 39' 57"}
SUN_DIST:        128.32 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      150.45d {+10h 01m 48s}  +16.72d {+16d 43' 13"}
MOON_DIST:       125.31 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.36,-12.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.59, 46.67 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #34450
M. H. Siegel (PSU), S. Dichiara (PSU), R. A. J. Eyles-Ferris (U Leicester), J.D. Gropp (PSU), J. A. Kennea (PSU), F. E. Marshall (NASA/GSFC), M. J. Moss (GWU), K. L. Page (U Leicester), D. M. Palmer (LANL), T. M. Parsotan (GSFC/UMBC/CRESSTII), B. Sbarufatti (INAF-OAB) and M. A. Williams (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 16:08:48 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 230816A (trigger=1185673). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 328.375, +37.828 which is
```
   RA(J2000) = 21h 53m 30s
   Dec(J2000) = +37d 49' 43"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 25 sec. The peak count rate was ~1900 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 16:10:18.4 UT, 90.2 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 328.44552, 37.85549 which is equivalent to:
```
   RA(J2000)  = 21h 53m 46.92s
   Dec(J2000) = +37d 51' 19.8"
```
with an uncertainty of 1.9 arcseconds (radius, 90% containment). This location is 223 arcseconds from the BAT onboard position. This position may be improved as more data are received; the latest position is available at https://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (2.90 x 10^21 cm^-2, Willingale et al. 2013), with an excess column of 3.7 (+3.48/-2.91) x 10^21 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 93 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 0.311.
Burst Advocate for this burst is M. H. Siegel (siegel AT swift.psu.edu). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 16 Aug 23 16:26:02 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1185673,   Seg_Num: 0
POINT_RA:        328.391d {+21h 53m 34s} (J2000)
POINT_DEC:       +37.836d {+37d 50' 09"} (J2000)
POINT_ROLL:      3.123d
IMG_START_DATE:  20172 TJD;   228 DOY;   23/08/16
IMG_START_TIME:  58989.49 SOD {16:23:09.49} UT,   861.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.984
N_STARS:         190
X_OFFSET:        146 [pixels]
Y_OFFSET:        263 [pixels]
X_MAX:           1585 [pixels]
Y_MAX:           1702 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw01185673000msufc0861.fits
SUN_POSTN:       145.89d {+09h 43m 32s}  +13.66d {+13d 39' 53"}
SUN_DIST:        128.32 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      150.49d {+10h 01m 57s}  +16.70d {+16d 42' 16"}
MOON_DIST:       125.32 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.36,-12.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.59, 46.67 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 16 Aug 23 16:26:16 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1185673,   Seg_Num: 0
POINT_RA:        328.391d {+21h 53m 34s} (J2000)
POINT_DEC:       +37.836d {+37d 50' 09"} (J2000)
POINT_ROLL:      3.123d
IMG_START_DATE:  20172 TJD;   228 DOY;   23/08/16
IMG_START_TIME:  58989.49 SOD {16:23:09.49} UT,   861.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.984
N_STARS:         190
X_OFFSET:        146 [pixels]
Y_OFFSET:        263 [pixels]
X_MAX:           1585 [pixels]
Y_MAX:           1702 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw01185673000msufc0861.fits
SUN_POSTN:       145.89d {+09h 43m 32s}  +13.66d {+13d 39' 53"}
SUN_DIST:        128.32 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      150.49d {+10h 01m 58s}  +16.70d {+16d 42' 14"}
MOON_DIST:       125.32 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.36,-12.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.59, 46.67 [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:     Wed 16 Aug 23 16:27:24 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1185673,   Seg_Num: 0
POINT_RA:        328.391d {+21h 53m 34s} (J2000)
POINT_DEC:       +37.836d {+37d 50' 09"} (J2000)
ROLL:            3.123d
IMG_START_DATE:  20172 TJD;   228 DOY;   23/08/16
IMG_START_TIME:  58989.49 SOD {16:23:09.49} UT,   861.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     713895821
X_OFFSET:        705 [pixels]
Y_OFFSET:        822 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       865
Y_GRB_POS:       982
BINNING_INDEX:   1
IM_URL:          sw01185673000msuni0893.fits
SUN_POSTN:       145.89d {+09h 43m 33s}  +13.66d {+13d 39' 52"}
SUN_DIST:        128.32 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      150.50d {+10h 02m 00s}  +16.70d {+16d 42' 01"}
MOON_DIST:       125.32 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.36,-12.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.59, 46.67 [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:     Wed 16 Aug 23 16:27:35 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1185673,   Seg_Num: 0
POINT_RA:        328.391d {+21h 53m 34s} (J2000)
POINT_DEC:       +37.836d {+37d 50' 09"} (J2000)
ROLL:            3.123d
IMG_START_DATE:  20172 TJD;   228 DOY;   23/08/16
IMG_START_TIME:  58989.49 SOD {16:23:09.49} UT,   861.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     713895821
X_OFFSET:        705 [pixels]
Y_OFFSET:        822 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       865
Y_GRB_POS:       982
BINNING_INDEX:   1
IM_URL:          sw01185673000msuni0893.fits
SUN_POSTN:       145.89d {+09h 43m 33s}  +13.66d {+13d 39' 52"}
SUN_DIST:        128.32 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      150.50d {+10h 02m 00s}  +16.70d {+16d 41' 58"}
MOON_DIST:       125.32 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.36,-12.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.59, 46.67 [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:     Wed 16 Aug 23 16:21:55 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1185673,   Seg_Num: 0
POINT_RA:        328.391d {+21h 53m 34s} (J2000)
POINT_DEC:       +37.834d {+37d 50' 04"} (J2000)
ROLL:            3.122d
IMG_START_DATE:  20172 TJD;   228 DOY;   23/08/16
IMG_START_TIME:  58434.40 SOD {16:13:54.40} UT,   306.1 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     713895266
X_OFFSET:        705 [pixels]
Y_OFFSET:        822 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       865
Y_GRB_POS:       982
BINNING_INDEX:   1
IM_URL:          sw01185673000msuni0338.fits
SUN_POSTN:       145.88d {+09h 43m 32s}  +13.67d {+13d 39' 56"}
SUN_DIST:        128.32 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      150.46d {+10h 01m 49s}  +16.72d {+16d 43' 04"}
MOON_DIST:       125.31 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.36,-12.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.59, 46.67 [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:     Wed 16 Aug 23 16:22:03 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1185673,   Seg_Num: 0
POINT_RA:        328.391d {+21h 53m 34s} (J2000)
POINT_DEC:       +37.834d {+37d 50' 04"} (J2000)
ROLL:            3.122d
IMG_START_DATE:  20172 TJD;   228 DOY;   23/08/16
IMG_START_TIME:  58434.40 SOD {16:13:54.40} UT,   306.1 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     713895266
X_OFFSET:        705 [pixels]
Y_OFFSET:        822 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       865
Y_GRB_POS:       982
BINNING_INDEX:   1
IM_URL:          sw01185673000msuni0338.fits
SUN_POSTN:       145.88d {+09h 43m 32s}  +13.67d {+13d 39' 56"}
SUN_DIST:        128.32 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      150.46d {+10h 01m 50s}  +16.72d {+16d 43' 02"}
MOON_DIST:       125.31 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.36,-12.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.59, 46.67 [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:     Wed 16 Aug 23 16:21:17 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     1185673,   Seg_Num: 0
GRB_RA:          328.4455d {+21h 53m 46.91s} (J2000),
                 328.6948d {+21h 54m 46.74s} (current),
                 327.9186d {+21h 51m 40.45s} (1950)
GRB_DEC:         +37.8554d {+37d 51' 19.4"} (J2000),
                 +37.9676d {+37d 58' 03.4"} (current),
                 +37.6188d {+37d 37' 07.7"} (1950)
GRB_ERROR:       1.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  20172 TJD;   228 DOY;   23/08/16
IMG_START_TIME:  58225.00 SOD {16:10:25.00} UT,   96.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       145.88d {+09h 43m 32s}  +13.67d {+13d 39' 57"}
SUN_DIST:        128.30 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      150.45d {+10h 01m 48s}  +16.72d {+16d 43' 11"}
MOON_DIST:       125.29 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.41,-12.83 [deg] galactic lon,lat of the burst
ECL_COORDS:      348.66, 46.67 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 16 Aug 23 17:46:36 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1185673,   Seg_Num: 1
POINT_RA:        328.414d {+21h 53m 39s} (J2000)
POINT_DEC:       +37.882d {+37d 52' 54"} (J2000)
POINT_ROLL:      15.094d
IMG_START_DATE:  20172 TJD;   228 DOY;   23/08/16
IMG_START_TIME:  63729.32 SOD {17:42:09.32} UT,   5601.0 [sec] since BAT Trigger Time
FILTER:          9, B
BKG_MEAN:        1.237
N_STARS:         119
X_OFFSET:        458 [pixels]
Y_OFFSET:        821 [pixels]
X_MAX:           1417 [pixels]
Y_MAX:           1780 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw01185673001msufc5601.fits
SUN_POSTN:       145.94d {+09h 43m 45s}  +13.65d {+13d 38' 49"}
SUN_DIST:        128.30 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      151.13d {+10h 04m 30s}  +16.45d {+16d 26' 46"}
MOON_DIST:       125.51 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.41,-12.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.64, 46.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.  
COMMENTS:        This Notice is generated as a result of an uploaded TOO on an old GRB -- this is not a newly detected burst.  
COMMENTS:        And the IMG_START_DATE/TIME fields are the current epoch -- not the original detection.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 16 Aug 23 17:46:45 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1185673,   Seg_Num: 1
POINT_RA:        328.414d {+21h 53m 39s} (J2000)
POINT_DEC:       +37.882d {+37d 52' 54"} (J2000)
POINT_ROLL:      15.094d
IMG_START_DATE:  20172 TJD;   228 DOY;   23/08/16
IMG_START_TIME:  63729.32 SOD {17:42:09.32} UT,   5601.0 [sec] since BAT Trigger Time
FILTER:          9, B
BKG_MEAN:        1.237
N_STARS:         119
X_OFFSET:        458 [pixels]
Y_OFFSET:        821 [pixels]
X_MAX:           1417 [pixels]
Y_MAX:           1780 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw01185673001msufc5601.fits
SUN_POSTN:       145.94d {+09h 43m 45s}  +13.65d {+13d 38' 49"}
SUN_DIST:        128.30 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      151.13d {+10h 04m 31s}  +16.45d {+16d 26' 44"}
MOON_DIST:       125.51 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.41,-12.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.64, 46.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        This Notice is generated as a result of an uploaded TOO on an old GRB -- this is not a newly detected burst.  
COMMENTS:        And the IMG_START_DATE/TIME fields are the current epoch -- not the original detection.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 16 Aug 23 17:51:54 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1185673,   Seg_Num: 1
POINT_RA:        328.414d {+21h 53m 39s} (J2000)
POINT_DEC:       +37.882d {+37d 52' 54"} (J2000)
POINT_ROLL:      15.093d
IMG_START_DATE:  20172 TJD;   228 DOY;   23/08/16
IMG_START_TIME:  64042.12 SOD {17:47:22.12} UT,   5913.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.545
N_STARS:         190
X_OFFSET:        218 [pixels]
Y_OFFSET:        581 [pixels]
X_MAX:           1657 [pixels]
Y_MAX:           2020 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw01185673001msufc5913.fits
SUN_POSTN:       145.94d {+09h 43m 46s}  +13.65d {+13d 38' 45"}
SUN_DIST:        128.30 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      151.17d {+10h 04m 41s}  +16.43d {+16d 25' 44"}
MOON_DIST:       125.53 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.41,-12.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.64, 46.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.  
COMMENTS:        This Notice is generated as a result of an uploaded TOO on an old GRB -- this is not a newly detected burst.  
COMMENTS:        And the IMG_START_DATE/TIME fields are the current epoch -- not the original detection.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 16 Aug 23 17:52:04 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1185673,   Seg_Num: 1
POINT_RA:        328.414d {+21h 53m 39s} (J2000)
POINT_DEC:       +37.882d {+37d 52' 54"} (J2000)
POINT_ROLL:      15.093d
IMG_START_DATE:  20172 TJD;   228 DOY;   23/08/16
IMG_START_TIME:  64042.12 SOD {17:47:22.12} UT,   5913.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.545
N_STARS:         190
X_OFFSET:        218 [pixels]
Y_OFFSET:        581 [pixels]
X_MAX:           1657 [pixels]
Y_MAX:           2020 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw01185673001msufc5913.fits
SUN_POSTN:       145.94d {+09h 43m 46s}  +13.65d {+13d 38' 45"}
SUN_DIST:        128.30 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      151.17d {+10h 04m 41s}  +16.43d {+16d 25' 42"}
MOON_DIST:       125.53 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.41,-12.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.64, 46.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        This Notice is generated as a result of an uploaded TOO on an old GRB -- this is not a newly detected burst.  
COMMENTS:        And the IMG_START_DATE/TIME fields are the current epoch -- not the original detection.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 16 Aug 23 17:53:01 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1185673,   Seg_Num: 1
POINT_RA:        328.414d {+21h 53m 39s} (J2000)
POINT_DEC:       +37.882d {+37d 52' 54"} (J2000)
ROLL:            15.093d
IMG_START_DATE:  20172 TJD;   228 DOY;   23/08/16
IMG_START_TIME:  64042.12 SOD {17:47:22.12} UT,   5913.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     713900873
X_OFFSET:        777 [pixels]
Y_OFFSET:        1140 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       937
Y_GRB_POS:       1300
BINNING_INDEX:   1
IM_URL:          sw01185673001msuni5945.fits
SUN_POSTN:       145.94d {+09h 43m 46s}  +13.65d {+13d 38' 44"}
SUN_DIST:        128.30 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      151.18d {+10h 04m 43s}  +16.43d {+16d 25' 31"}
MOON_DIST:       125.53 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.41,-12.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.64, 46.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        This Notice is generated as a result of an uploaded TOO on an old GRB -- this is not a newly detected burst.  
COMMENTS:        And the IMG_START_DATE/TIME fields are the current epoch -- not the original detection.  
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:     Wed 16 Aug 23 17:53:09 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1185673,   Seg_Num: 1
POINT_RA:        328.414d {+21h 53m 39s} (J2000)
POINT_DEC:       +37.882d {+37d 52' 54"} (J2000)
ROLL:            15.093d
IMG_START_DATE:  20172 TJD;   228 DOY;   23/08/16
IMG_START_TIME:  64042.12 SOD {17:47:22.12} UT,   5913.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     713900873
X_OFFSET:        777 [pixels]
Y_OFFSET:        1140 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       937
Y_GRB_POS:       1300
BINNING_INDEX:   1
IM_URL:          sw01185673001msuni5945.fits
SUN_POSTN:       145.94d {+09h 43m 46s}  +13.65d {+13d 38' 44"}
SUN_DIST:        128.30 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      151.18d {+10h 04m 43s}  +16.42d {+16d 25' 30"}
MOON_DIST:       125.53 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.41,-12.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.64, 46.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        This Notice is generated as a result of an uploaded TOO on an old GRB -- this is not a newly detected burst.  
COMMENTS:        And the IMG_START_DATE/TIME fields are the current epoch -- not the original detection.  
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:     Wed 16 Aug 23 17:56:04 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1185673,   Seg_Num: 1
POINT_RA:        328.413d {+21h 53m 39s} (J2000)
POINT_DEC:       +37.881d {+37d 52' 52"} (J2000)
POINT_ROLL:      15.094d
IMG_START_DATE:  20172 TJD;   228 DOY;   23/08/16
IMG_START_TIME:  64297.49 SOD {17:51:37.49} UT,   6169.2 [sec] since BAT Trigger Time
FILTER:          9, B
BKG_MEAN:        1.271
N_STARS:         104
X_OFFSET:        458 [pixels]
Y_OFFSET:        821 [pixels]
X_MAX:           1417 [pixels]
Y_MAX:           1780 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    4
SL_URL:          sw01185673001msufc6169.fits
SUN_POSTN:       145.94d {+09h 43m 46s}  +13.64d {+13d 38' 42"}
SUN_DIST:        128.30 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      151.20d {+10h 04m 48s}  +16.42d {+16d 24' 56"}
MOON_DIST:       125.54 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.41,-12.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.64, 46.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.  
COMMENTS:        This Notice is generated as a result of an uploaded TOO on an old GRB -- this is not a newly detected burst.  
COMMENTS:        And the IMG_START_DATE/TIME fields are the current epoch -- not the original detection.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 16 Aug 23 17:56:18 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1185673,   Seg_Num: 1
POINT_RA:        328.413d {+21h 53m 39s} (J2000)
POINT_DEC:       +37.881d {+37d 52' 52"} (J2000)
POINT_ROLL:      15.094d
IMG_START_DATE:  20172 TJD;   228 DOY;   23/08/16
IMG_START_TIME:  64297.49 SOD {17:51:37.49} UT,   6169.2 [sec] since BAT Trigger Time
FILTER:          9, B
BKG_MEAN:        1.271
N_STARS:         104
X_OFFSET:        458 [pixels]
Y_OFFSET:        821 [pixels]
X_MAX:           1417 [pixels]
Y_MAX:           1780 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    4
SL_URL:          sw01185673001msufc6169.fits
SUN_POSTN:       145.94d {+09h 43m 46s}  +13.64d {+13d 38' 42"}
SUN_DIST:        128.30 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      151.20d {+10h 04m 49s}  +16.41d {+16d 24' 53"}
MOON_DIST:       125.54 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.41,-12.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.64, 46.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        This Notice is generated as a result of an uploaded TOO on an old GRB -- this is not a newly detected burst.  
COMMENTS:        And the IMG_START_DATE/TIME fields are the current epoch -- not the original detection.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 16 Aug 23 17:57:11 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1185673,   Seg_Num: 1
POINT_RA:        328.413d {+21h 53m 39s} (J2000)
POINT_DEC:       +37.881d {+37d 52' 52"} (J2000)
ROLL:            15.094d
IMG_START_DATE:  20172 TJD;   228 DOY;   23/08/16
IMG_START_TIME:  64297.49 SOD {17:51:37.49} UT,   6169.2 [sec] since BAT Trigger Time
FILTER:          9, B
EXPOSURE_ID:     713901129
X_OFFSET:        777 [pixels]
Y_OFFSET:        1140 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       937
Y_GRB_POS:       1300
BINNING_INDEX:   1
IM_URL:          sw01185673001msuni6201.fits
SUN_POSTN:       145.94d {+09h 43m 47s}  +13.64d {+13d 38' 41"}
SUN_DIST:        128.30 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      151.21d {+10h 04m 51s}  +16.41d {+16d 24' 43"}
MOON_DIST:       125.54 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.41,-12.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.64, 46.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        This Notice is generated as a result of an uploaded TOO on an old GRB -- this is not a newly detected burst.  
COMMENTS:        And the IMG_START_DATE/TIME fields are the current epoch -- not the original detection.  
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:     Wed 16 Aug 23 17:57:24 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1185673,   Seg_Num: 1
POINT_RA:        328.413d {+21h 53m 39s} (J2000)
POINT_DEC:       +37.881d {+37d 52' 52"} (J2000)
ROLL:            15.094d
IMG_START_DATE:  20172 TJD;   228 DOY;   23/08/16
IMG_START_TIME:  64297.49 SOD {17:51:37.49} UT,   6169.2 [sec] since BAT Trigger Time
FILTER:          9, B
EXPOSURE_ID:     713901129
X_OFFSET:        777 [pixels]
Y_OFFSET:        1140 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       937
Y_GRB_POS:       1300
BINNING_INDEX:   1
IM_URL:          sw01185673001msuni6201.fits
SUN_POSTN:       145.94d {+09h 43m 47s}  +13.64d {+13d 38' 41"}
SUN_DIST:        128.30 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      151.21d {+10h 04m 51s}  +16.41d {+16d 24' 41"}
MOON_DIST:       125.54 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:       88.41,-12.80 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.64, 46.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        This Notice is generated as a result of an uploaded TOO on an old GRB -- this is not a newly detected burst.  
COMMENTS:        And the IMG_START_DATE/TIME fields are the current epoch -- not the original detection.  
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 #34451
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-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the Swift GRB230816.67 (trigger No 1185673,21h 53m 29.98s , +37d 49m 42.6s, R=0.05) errorbox 2108 sec after notice time and 2130 sec after trigger time at 2023-08-16 16:44:18 UT, with upper limit up to 17.2 mag. The observations began at zenith distance = 15 deg. The sun altitude is -25.0 deg.
The galactic latitude b = -13 deg., longitude l = 89 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2254998
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

    2220 |        MASTER-Tunka |   C |   180 | 17.2 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #34453
S.Q. Jiang, S.Y. Fu, X. Liu, T.H. Lu, Z.P. Zhu, D. Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:
We observed the field of GRB 230816A detected by Swift (Siegel et al., GCN 34450) using the HMT-0.5m telescope located at Nanshan, Xinjiang, China. Observations started at 16:10:20 UT on 2023-08-16, i.e., 92 s after the Swift/BAT trigger, we obtained a serise of 3x20, 3x40, 4x60, 12x90 s frames without any filter.
An uncatalogued optical source is detected in our stacked image at coordinates
```
R.A. (J2000) = 21:53:46.9
Dec. (J2000) = +37:51:15.9
```
2.23 arcsec away from the center of the XRT error circle (radius: 1.9 arcsec, 90% containment; Siegel et al., GCN 34450) with m(r) = 19.6 +/- 0.18 mag(AB) at 24.6 min post-burst, calibrated with the nearby PanSTAR field in the Sloan r-filter and the magnitude is not corrected for Galactic extinction. We thus think this OT is the optical afterglow of the burst.
GCN Circular #34456
A. S. Moskvitin and O. I. Spiridonova (SAO RAS), report on behalf of the GRB follow-up team.
We observed the field of the GRB 230816A (Siegelet al., GCN 34450) with the 1-m telescope of SAO RAS Zeiss-1000 equipped with the CCD photometer. We obtained 8 x 300 sec. images in Rc band on August 16, 17:45:41 -- 18:35:29 UT.
The OT (Jiang et al., GCN 34453) is clearly detected in our stacked frame with the coordinates
```
R.A. (J2000) = 21:53:46.9,
Decl.(J2000) = +37:51:16.7 (+/- 0".5)
```
and the brightness of R = 21.0 +/- 0.1 (t_mid - t0 = 2.030h = 0.0846d).
This preliminary photometry is based on nearby USNO-B1 stars (R2 mag), the magnitude is not corrected for MW extinction.
GCN Circular #34455
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-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Swift GRB230816.80 (trigger No 1185685,19h 59m 06.41s , +35d 20m 26.9s, R=0.05) errorbox 14 sec after notice time and 100 sec after trigger time at 2023-08-16 19:12:28 UT, with upper limit up to 17.5 mag. The observations began at zenith distance = 13 deg. The sun altitude is -22.4 deg.
The galactic latitude b = 3 deg., longitude l = 72 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2255110
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

     110 |      MASTER-Tavrida |   C |    20 | 17.0 |        
     142 |      MASTER-Tavrida |   C |    30 | 17.5 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #34457
N. Pankov (HSE, IKI), I. Reva (FAI), V. Kim (FAI), A. Pozanenko (IKI), S. Belkin (IKI) report on behalf of the GRB-IKI-FuN.
We observed the field of the GRB 230816A (Siegel et al., GCN 34450) with Zeiss-1000 telescope of Tien-Shan Observatory (TShAO) and AZT-20 telescope of Assy Observatory. We clearly detect the afterglow (Jiang et al., GCN 34453; Moskivitin et al., GCN 34456) in the stacked images.
Preliminary photometry is following
```
Date       UT start   t-T0    Filter Exp.   OT    Err.  UL(3sigma)
                      (mid, days)    (s)

2023-08-16 16:21:24   0.034787  R    25*180 19.57   0.10  22.3   
2023-08-16 17:26:29   0.072354  r'   53*60  21.10|  0.025 23.5   
```
The photometry is based on nearby stars of USNO-B1.0 and PanSTARRS-DR1 catalogues.
```
RA Dec R2 r'
328.5043802 +37.8674441 16.47 16.8245
328.3579777 +37.8706420 17.04 17.1589
328.4483771 +37.8290610 15.45 15.3054
```
GCN Circular #34458
Mohammad Odeh, Nada Odeh, Osama Ghannam, Anas Mohammad, and Khalfan Al-Noaimy, report on behalf of Al-Khatim Observatory (AKO) operated by the International Astronomical Center in Abu Dhabi, UAE:
We observed the field of the GRB 230816A (Siegel et al., GCN 34450) with our 0.36m f/7.7 robotic telescope. We obtained 21 x 180 sec. images in a clear filter on 16 August, from 19:05 to 20:36 UT.
We detected the afterglow (Jiang et al., GCN 34453; Moskivitin et al., GCN 34456; Pankov et al., GCN 34457) in our stacked images with the coordinates (J2000) R.A.= 21:53:47.01, Dec.= +37:51:16.7 and the brightness of Mv = 20.6 +/- 0.27 (t_mid - t0 = 3.7 hours).
The magnitude is not corrected for galactic extinction.
GCN Circular #34459
S. Klose, S. Melnikov, B. Stecklum, A. Nicuesa Guelbenzu, F. Ludwig (all TLS Tautenburg) report:
We observed the field of GRB 230816A (Siegel et al., GCN 34450) with the Tautenburg 1.34m Schmidt telescope equipped with the TAUKAM 6kx6k CCD camera and using the Sloan filter set.
For the optical transient discovered by Jiang et al. (GCN 34453) we measure the following preliminary magnitudes:
r = 21.75 +/- 0.25 (midtime: August 16, 2023, 20:23:11 UT),
i = 20.33 +/- 0.08 (midtime: August 16, 2023, 20:34:05 UT),
calibrated against USNO stars in the field. The photometry will still be improved by calibrating the data via a nearby Pan-STARRS field.
GCN Circular #34460
R. Kumar (IITB), R. Sharma (IITB), V. Swain (IITB), A. Salgundi (IITB), H. Kumar (IITB), G. Waratkar(IITB), V. Bhalerao (IITB), G. C. Anupama(IIA), S. Barway (IIA) and K. Angail (IAO) report on behalf of the GIT team:
We observed the field of GRB 230816A detected by SWIFT (Siegel et al., GCN 34450) with 0.7m GROWTH-India Telescope (GIT). We started observations at 16:40:00 UT, i.e., 31.2 mins after the Swift/BAT trigger. We obtained 5 frames in the r' band of 300 sec each. After image subtraction, we detected a source in our stacked image at RA 21:53:46.96, Dec: +37:51:16.08 with an uncertainty of 0.67 arcsec - coincident with the reported afterglow (Jiang et al., GCN 34453), and 3.75 arsec away from center of the XRT error circle (Siegel et al., GCN 34450).
We note that there is a faint source (m_r ~ 23.0) nearly coincident with the counterpart in the Pan-STARRS1 images, which could be a host of this GRB. Our image subtraction ensures that this source flux does not affect out photometric measurements. There is no minor planet present at this position. The photometric results are as follows:
----------------------------------------------------------------------
JD (mid) | T_mid-T0 (mins) | Exposure (sec) | Filter | Magnitude (AB) |
----------------------------------------------------------------------
2460173.202193 | 42.35 | 5 x 300 | r' | 20.61 +/- 0.06 |
----------------------------------------------------------------------
Our results are consistent with other reports (Jiang et al. GCN 34453, Moskvitin et al., GCN 34456, Pankov et al., GCN 34457, Odeh et al., GCN 34458, Klose et al., GCN 34459). We encourage photometric for further confirmation and spectroscopic follow-up for redshift measurement. The magnitudes are calibrated against PanSTARRS DR1 (Chambers et al., 2016) and are 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 #34462
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 1206 s of XRT Photon Counting mode data and 1 UVOT images for GRB 230816A, 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 = 328.44568, +37.85495 which is equivalent to:
```
RA (J2000): 21h 53m 46.96s
Dec (J2000): +37d 51' 17.8"
```
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 #34469
FROM: Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy - MPC Code C82
Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy in a large collaboration with: M.G. Dainotti (National Astronomical Observatory of Japan),=20 Y. Niino (Tokyo University, Institute of Astronomy),=20 K. Kalinowski (Aarhus University, Department of Physics and Astronomy), B. De Simone (Universita' degli Studi Di Salerno) report:=20
We observed the field of GRB 230816A (Siegel et al., GCN 34450) with telescope of Nastro Verde Observatory - Sorrento (Naples), Italy. Member of:=20 AAVSO - American Association of Variable Star Observers. UAI/SSV - Unione Astrofili Italiani/sezione stelle variabili. AstroCampania Associazione
The observations started at 18:55 UT of 2023/08/16, after about 2,45 hours after the GRB trigger, at the end of twilight with clear skies, with principal telescope SC 0.35 f/10 with focal reduced + CCD Sbig ST10 XME I took 25 image of 240 sec each. All images are unfiltered, calibrated with masterdark and masterflat,stacked with Tycho Tracker software We have detected a faint source of magnitude 19.1 G at the enhanced position reported by Swift-XRT (Siegel et al., GCN 34450, P.A. Evans et al., GCN 34462) and by optical telescopes ( A. S. Moskvitin et al GCN 34456., N. Pankov et al GCN 34457., Mohammad Odeh et al GCN 34458., S. Klose et al GCN 34459., R. Kumar et al GCN 34460) at following position
```
RA      (J2000.0)  21h 53m 46.87s=20
Decl.   (J2000.0) +37=C2=B0 51' 14.7" =20
```
Photometry and astrometry on stack of 13 images each of 240 sec
GRB 230816A KC2023 08 16.88481 21 53 46.87 +37 51 14.7 19.1 G C82
Magnitudes were estimated with the GAIA DR2 cat. and are not corrected for galactic dust extinction.
The message may be cited.
GCN Circular #34470
M.G. Bernardini (INAF-OAB), J. D. Gropp (PSU), S. Dichiara (PSU), J.A. Kennea (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), E. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA) and P.A. Evans report on behalf of the Swift-XRT team:
We have analysed 3.9 ks of XRT data for GRB 230816A, from 97 s to 91.3 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode.
The light curve can be modelled with a power-law decay with a decay index of alpha=1.44 (+0.27, -0.43).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.66 (+0.31, -0.14). The best-fitting absorption column is consistent with the Galactic value of 2.9 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 4.4 x 10^-11 (5.6 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.9 (+/-1.2) x 10^21 cm^-2
Galactic foreground: 2.9 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.66 (+0.31, -0.14)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01185673.
This circular is an official product of the Swift-XRT team.
GCN Circular #34473
Liping Xin (NAOC), Chao Wu (NAOC), Zhe Kang (CHO), Xuhui Han (NAOC), Huali Li (NAOC), Xiaomeng Lu (NAOC), Damien Turpin(CEA), Zhenwei Li (CHO)=EF=BC=8CPinpin Zhang (NAOC)=EF=BC=8CRuosong Zhang (NAOC)=EF=BC=8CYulei Qiu (NAOC)=EF=BC=8CYou Lv (CHO)=EF=BC=8CJing Wang(GXU), Cordier Bertrand (CEA) and Jianyan Wei (NAOC) on behalf of SVOM GRB team
We observed the burst GRB230816A (Siegel et al. GCN Circ. 34450) on 16:15:38 UT, Aug. 16th, 2023, about 6.9 minutes after the Swift trigger with C-GFT (Chinese Ground Follow-up Telescope in SVOM mission) in System Test Mode (STM). C-GFT is located at Jilin (long.=3D126.33 deg, lat.=3D43.8243778 deg), Changchun Observatory, National Astronomical Observatories, CAS. It has FOV of 1.5 deg X 1.5 deg with a 4k*4k CMOS detector mounted on the primary focus of 1.2-meter-aperure telescope.
A series of g and r band images were obtained. The exposure time was 10 seconds for each frame.
The optical afterglow reported (Jiang et al., GCN 34453, Moskvitin et al., GCN 34456., Pankov et al.,GCN 34457, Odeh et al., GCN 34458Klose et al., GCN 34459., Kumar et al., GCN 34460; Ruocco et al., GCN 34469) was also clearly detected by our stacked r-band image (100 * 10 seconds). The brightness was estimated to be about 20.1 +/-0.2 magnitude in r-band with the midtime of about 34 min after the burst, after calibration with nearby USNO R2 catalogs.
More detailed analysis is continuing.
We thank the observation assistant Bowen Li at Jilin observatory for their excellent support.
This message may be cited.
GCN Circular #34474
A. Y. Lien (U Tampa), S. D. Barthelmy (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), C. B. Markwardt (GSFC), 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-239 to T+303 sec from the recent telemetry downlink, we report further analysis of BAT GRB 230816A (trigger #1185673) (Siegel, et al., GCN Circ. 34450). The BAT ground-calculated position is RA, Dec = 328.453, 37.853 deg which is
```
RA(J2000) = 21h 53m 48.8s
Dec(J2000) = +37d 51' 12.1"
```
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 98%.
The mask weighted light curve shows a fast rise exponential decay type single peak. T90 (15-350 keV) is 20.48 +- 4.94 sec (estimated error including systematics).
The time-averaged spectrum from T-5.60 to T+21.08 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.43 +- 0.14. The fluence in the 15-150 keV band is 7.7 +- 0.7 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+0.60 sec in the 15-150 keV band is 1.0 +- 0.1 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/1185673/BA/

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Jochen Greiner, last update: 18-Aug-2023 [Disclaimer]