Gamma-ray Burst 240712A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 12 Jul 24 03:28:05 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1242223,   Seg_Num: 0
GRB_RA:          122.369d {+08h 09m 29s} (J2000),
                 122.596d {+08h 10m 23s} (current),
                 121.906d {+08h 07m 37s} (1950)
GRB_DEC:         -37.077d {-37d 04' 35"} (J2000),
                 -37.150d {-37d 09' 00"} (current),
                 -36.929d {-36d 55' 42"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       18950 [cnts]    Image_Peak=380 [image_cnts]
TRIGGER_DUR:     8.192 [sec] 
TRIGGER_INDEX:   477     E_range: 25-100 keV
BKG_INTEN:       132479 [cnts]
BKG_TIME:        12342.20 SOD {03:25:42.20} UT
BKG_DUR:         64 [sec]
GRB_DATE:        20503 TJD;   194 DOY;   24/07/12
GRB_TIME:        12432.83 SOD {03:27:12.83} UT
GRB_PHI:          -3.15 [deg]
GRB_THETA:        21.35 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     12.60 [sigma]
IMAGE_SIGNIF:    7.11 [sigma]
MERIT_PARAMS:     +1  +0  +0  +3  +2  -3  +0  +1 -50  +0 
SUN_POSTN:       111.95d {+07h 27m 47s}  +21.90d {+21d 54' 11"}
SUN_DIST:         59.90 [deg]   Sun_angle= -0.7 [hr] (East of Sun)
MOON_POSTN:      180.95d {+12h 03m 49s}   +0.43d {+00d 25' 42"}
MOON_DIST:        65.57 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      254.12, -2.16 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      138.46,-55.20 [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 = 134.87,18.78 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 12 Jul 24 03:29:47 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     1242223,   Seg_Num: 0
POINT_RA:        122.367d {+08h 09m 28s} (J2000)
POINT_DEC:       -37.083d {-37d 04' 57"} (J2000)
IMG_START_DATE:  20503 TJD;   194 DOY;   24/07/12
IMG_START_TIME:  12569.53 SOD {03:29:29.53} UT,   136.7 [sec] since BAT Trigger Time
COUNTS:          2    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:     Fri 12 Jul 24 03:34:14 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1242223,   Seg_Num: 0
POINT_RA:        122.367d {+08h 09m 28s} (J2000)
POINT_DEC:       -37.083d {-37d 04' 56"} (J2000)
POINT_ROLL:      348.812d
IMG_START_DATE:  20503 TJD;   194 DOY;   24/07/12
IMG_START_TIME:  12573.43 SOD {03:29:33.43} UT,   140.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.888
N_STARS:         190
X_OFFSET:        525 [pixels]
Y_OFFSET:        561 [pixels]
X_MAX:           1484 [pixels]
Y_MAX:           1520 [pixels]
DET_THRESH:      21
PHOTO_THRESH:    12
SL_URL:          sw01242223000msufc0140.fits
SUN_POSTN:       111.95d {+07h 27m 48s}  +21.90d {+21d 54' 09"}
SUN_DIST:         59.90 [deg]   Sun_angle= -0.7 [hr] (East of Sun)
MOON_POSTN:      181.00d {+12h 04m 00s}   +0.40d {+00d 24' 15"}
MOON_DIST:        65.59 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      254.12, -2.17 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.46,-55.21 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 12 Jul 24 03:34:32 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1242223,   Seg_Num: 0
POINT_RA:        122.367d {+08h 09m 28s} (J2000)
POINT_DEC:       -37.083d {-37d 04' 56"} (J2000)
POINT_ROLL:      348.812d
IMG_START_DATE:  20503 TJD;   194 DOY;   24/07/12
IMG_START_TIME:  12573.43 SOD {03:29:33.43} UT,   140.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.888
N_STARS:         190
X_OFFSET:        525 [pixels]
Y_OFFSET:        561 [pixels]
X_MAX:           1484 [pixels]
Y_MAX:           1520 [pixels]
DET_THRESH:      21
PHOTO_THRESH:    12
SL_URL:          sw01242223000msufc0140.fits
SUN_POSTN:       111.95d {+07h 27m 48s}  +21.90d {+21d 54' 08"}
SUN_DIST:         59.90 [deg]   Sun_angle= -0.7 [hr] (East of Sun)
MOON_POSTN:      181.00d {+12h 04m 00s}   +0.40d {+00d 24' 11"}
MOON_DIST:        65.59 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      254.12, -2.17 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.46,-55.21 [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:     Fri 12 Jul 24 03:35:48 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1242223,   Seg_Num: 0
POINT_RA:        122.367d {+08h 09m 28s} (J2000)
POINT_DEC:       -37.083d {-37d 04' 56"} (J2000)
ROLL:            348.812d
IMG_START_DATE:  20503 TJD;   194 DOY;   24/07/12
IMG_START_TIME:  12573.43 SOD {03:29:33.43} UT,   140.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     742447807
X_OFFSET:        844 [pixels]
Y_OFFSET:        880 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1004
Y_GRB_POS:       1040
BINNING_INDEX:   1
IM_URL:          sw01242223000msuni0174.fits
SUN_POSTN:       111.95d {+07h 27m 48s}  +21.90d {+21d 54' 08"}
SUN_DIST:         59.90 [deg]   Sun_angle= -0.7 [hr] (East of Sun)
MOON_POSTN:      181.01d {+12h 04m 02s}   +0.40d {+00d 23' 53"}
MOON_DIST:        65.59 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      254.12, -2.17 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.46,-55.21 [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:     Fri 12 Jul 24 03:36:01 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1242223,   Seg_Num: 0
POINT_RA:        122.367d {+08h 09m 28s} (J2000)
POINT_DEC:       -37.083d {-37d 04' 56"} (J2000)
ROLL:            348.812d
IMG_START_DATE:  20503 TJD;   194 DOY;   24/07/12
IMG_START_TIME:  12573.43 SOD {03:29:33.43} UT,   140.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     742447807
X_OFFSET:        844 [pixels]
Y_OFFSET:        880 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1004
Y_GRB_POS:       1040
BINNING_INDEX:   1
IM_URL:          sw01242223000msuni0174.fits
SUN_POSTN:       111.95d {+07h 27m 48s}  +21.90d {+21d 54' 08"}
SUN_DIST:         59.90 [deg]   Sun_angle= -0.7 [hr] (East of Sun)
MOON_POSTN:      181.01d {+12h 04m 03s}   +0.40d {+00d 23' 50"}
MOON_DIST:        65.59 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      254.12, -2.17 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.46,-55.21 [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:     Fri 12 Jul 24 03:41:53 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1242223,   Seg_Num: 0
POINT_RA:        122.365d {+08h 09m 28s} (J2000)
POINT_DEC:       -37.083d {-37d 04' 57"} (J2000)
POINT_ROLL:      348.814d
IMG_START_DATE:  20503 TJD;   194 DOY;   24/07/12
IMG_START_TIME:  12731.70 SOD {03:32:11.70} UT,   298.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.183
N_STARS:         190
X_OFFSET:        285 [pixels]
Y_OFFSET:        321 [pixels]
X_MAX:           1724 [pixels]
Y_MAX:           1760 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw01242223000msufc0298.fits
SUN_POSTN:       111.96d {+07h 27m 49s}  +21.90d {+21d 54' 06"}
SUN_DIST:         59.90 [deg]   Sun_angle= -0.7 [hr] (East of Sun)
MOON_POSTN:      181.05d {+12h 04m 13s}   +0.37d {+00d 22' 28"}
MOON_DIST:        65.61 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      254.12, -2.17 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.46,-55.21 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 12 Jul 24 03:42:06 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1242223,   Seg_Num: 0
POINT_RA:        122.365d {+08h 09m 28s} (J2000)
POINT_DEC:       -37.083d {-37d 04' 57"} (J2000)
POINT_ROLL:      348.814d
IMG_START_DATE:  20503 TJD;   194 DOY;   24/07/12
IMG_START_TIME:  12731.70 SOD {03:32:11.70} UT,   298.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.183
N_STARS:         190
X_OFFSET:        285 [pixels]
Y_OFFSET:        321 [pixels]
X_MAX:           1724 [pixels]
Y_MAX:           1760 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw01242223000msufc0298.fits
SUN_POSTN:       111.96d {+07h 27m 49s}  +21.90d {+21d 54' 06"}
SUN_DIST:         59.90 [deg]   Sun_angle= -0.7 [hr] (East of Sun)
MOON_POSTN:      181.06d {+12h 04m 13s}   +0.37d {+00d 22' 25"}
MOON_DIST:        65.61 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      254.12, -2.17 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.46,-55.21 [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:     Fri 12 Jul 24 03:43:17 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1242223,   Seg_Num: 0
POINT_RA:        122.365d {+08h 09m 28s} (J2000)
POINT_DEC:       -37.083d {-37d 04' 57"} (J2000)
ROLL:            348.814d
IMG_START_DATE:  20503 TJD;   194 DOY;   24/07/12
IMG_START_TIME:  12731.70 SOD {03:32:11.70} UT,   298.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     742447965
X_OFFSET:        844 [pixels]
Y_OFFSET:        880 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1004
Y_GRB_POS:       1040
BINNING_INDEX:   1
IM_URL:          sw01242223000msuni0332.fits
SUN_POSTN:       111.96d {+07h 27m 50s}  +21.90d {+21d 54' 05"}
SUN_DIST:         59.90 [deg]   Sun_angle= -0.7 [hr] (East of Sun)
MOON_POSTN:      181.06d {+12h 04m 15s}   +0.37d {+00d 22' 08"}
MOON_DIST:        65.61 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      254.12, -2.17 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.46,-55.21 [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:     Fri 12 Jul 24 03:43:52 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1242223,   Seg_Num: 0
POINT_RA:        122.365d {+08h 09m 28s} (J2000)
POINT_DEC:       -37.083d {-37d 04' 57"} (J2000)
ROLL:            348.814d
IMG_START_DATE:  20503 TJD;   194 DOY;   24/07/12
IMG_START_TIME:  12731.70 SOD {03:32:11.70} UT,   298.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     742447965
X_OFFSET:        844 [pixels]
Y_OFFSET:        880 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1004
Y_GRB_POS:       1040
BINNING_INDEX:   1
IM_URL:          sw01242223000msuni0332.fits
SUN_POSTN:       111.96d {+07h 27m 50s}  +21.90d {+21d 54' 05"}
SUN_DIST:         59.90 [deg]   Sun_angle= -0.7 [hr] (East of Sun)
MOON_POSTN:      181.07d {+12h 04m 16s}   +0.37d {+00d 22' 00"}
MOON_DIST:        65.62 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      254.12, -2.17 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.46,-55.21 [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:     Fri 12 Jul 24 03:48:52 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1242223,   Seg_Num: 0
POINT_RA:        122.365d {+08h 09m 28s} (J2000)
POINT_DEC:       -37.083d {-37d 04' 58"} (J2000)
POINT_ROLL:      348.814d
IMG_START_DATE:  20503 TJD;   194 DOY;   24/07/12
IMG_START_TIME:  13311.01 SOD {03:41:51.01} UT,   878.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.711
N_STARS:         190
X_OFFSET:        285 [pixels]
Y_OFFSET:        321 [pixels]
X_MAX:           1724 [pixels]
Y_MAX:           1760 [pixels]
DET_THRESH:      20
PHOTO_THRESH:    12
SL_URL:          sw01242223000msufc0878.fits
SUN_POSTN:       111.96d {+07h 27m 51s}  +21.90d {+21d 54' 03"}
SUN_DIST:         59.90 [deg]   Sun_angle= -0.7 [hr] (East of Sun)
MOON_POSTN:      181.10d {+12h 04m 25s}   +0.35d {+00d 20' 50"}
MOON_DIST:        65.63 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      254.12, -2.17 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.46,-55.21 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 12 Jul 24 03:49:06 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1242223,   Seg_Num: 0
POINT_RA:        122.365d {+08h 09m 28s} (J2000)
POINT_DEC:       -37.083d {-37d 04' 58"} (J2000)
POINT_ROLL:      348.814d
IMG_START_DATE:  20503 TJD;   194 DOY;   24/07/12
IMG_START_TIME:  13311.01 SOD {03:41:51.01} UT,   878.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.711
N_STARS:         190
X_OFFSET:        285 [pixels]
Y_OFFSET:        321 [pixels]
X_MAX:           1724 [pixels]
Y_MAX:           1760 [pixels]
DET_THRESH:      20
PHOTO_THRESH:    12
SL_URL:          sw01242223000msufc0878.fits
SUN_POSTN:       111.96d {+07h 27m 51s}  +21.90d {+21d 54' 03"}
SUN_DIST:         59.90 [deg]   Sun_angle= -0.7 [hr] (East of Sun)
MOON_POSTN:      181.11d {+12h 04m 25s}   +0.35d {+00d 20' 47"}
MOON_DIST:        65.63 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      254.12, -2.17 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.46,-55.21 [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:     Fri 12 Jul 24 03:50:26 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1242223,   Seg_Num: 0
POINT_RA:        122.365d {+08h 09m 28s} (J2000)
POINT_DEC:       -37.083d {-37d 04' 58"} (J2000)
ROLL:            348.814d
IMG_START_DATE:  20503 TJD;   194 DOY;   24/07/12
IMG_START_TIME:  13311.01 SOD {03:41:51.01} UT,   878.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     742448544
X_OFFSET:        844 [pixels]
Y_OFFSET:        880 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1004
Y_GRB_POS:       1040
BINNING_INDEX:   1
IM_URL:          sw01242223000msuni0912.fits
SUN_POSTN:       111.96d {+07h 27m 51s}  +21.90d {+21d 54' 03"}
SUN_DIST:         59.90 [deg]   Sun_angle= -0.7 [hr] (East of Sun)
MOON_POSTN:      181.12d {+12h 04m 28s}   +0.34d {+00d 20' 28"}
MOON_DIST:        65.63 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      254.12, -2.17 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.46,-55.21 [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:     Fri 12 Jul 24 03:50:33 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1242223,   Seg_Num: 0
POINT_RA:        122.365d {+08h 09m 28s} (J2000)
POINT_DEC:       -37.083d {-37d 04' 58"} (J2000)
ROLL:            348.814d
IMG_START_DATE:  20503 TJD;   194 DOY;   24/07/12
IMG_START_TIME:  13311.01 SOD {03:41:51.01} UT,   878.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     742448544
X_OFFSET:        844 [pixels]
Y_OFFSET:        880 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1004
Y_GRB_POS:       1040
BINNING_INDEX:   1
IM_URL:          sw01242223000msuni0912.fits
SUN_POSTN:       111.96d {+07h 27m 51s}  +21.90d {+21d 54' 03"}
SUN_DIST:         59.90 [deg]   Sun_angle= -0.7 [hr] (East of Sun)
MOON_POSTN:      181.12d {+12h 04m 28s}   +0.34d {+00d 20' 26"}
MOON_DIST:        65.63 [deg]
MOON_ILLUM:      33 [%]
GAL_COORDS:      254.12, -2.17 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.46,-55.21 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #36851
C. Salvaggio (INAF-OAB), N. P. M. Kuin (UCL-MSSL), D. M. Palmer (LANL), T. Sbarrato (INAF-OAB) and B. Sbarufatti (INAF-OAB) report on behalf of the Neil Gehrels Swift Observatory Team:
At 03:27:12 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 240712A (trigger=1242223). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 122.369, -37.077 which is
```
   RA(J2000) = 08h 09m 29s
   Dec(J2000) = -37d 04' 35"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve before T+8s after the trigger is unavailable due to a telemetry outage. The burst triggered on the 8s timescale indicating that it is a long burst, but no other duration information is presently available.
The XRT began observing the field at 03:29:47 UT, 155 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 122.3378, -37.0923 which is equivalent to:
```
  RA(hh mm ss.s) = 8h09m21.08s
Dec(dd mm ss.s) = -37:05:32.21
```
with an uncertainty of 6.4 arcseconds (radius, 90% containment). This location is 105 arcseconds from the BAT onboard position, within the BAT error circle.
UVOT took a finding chart exposure of 150 seconds with the White filter starting 140 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 25% of the BAT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the BAT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the large, but uncertain, extinction expected.
Burst Advocate for this burst is C. Salvaggio (chiara.salvaggio AT inaf.it). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/)
GCN Circular #36870
N. P. M. Kuin (UCL-MSSL) and C. Salvaggio (INAF-OAB) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 240712A 141 s after the BAT trigger (Salvaggio et al., GCN Circ. 36851). No optical afterglow consistent with the XRT position in GCN Circ 36851 is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC           141          290          147         >20.2
u_FC               299          549          246         >19.9
white              141         1550          392         >21.0
v                  629         5288          179         >19.0
b                  555         1525           97         >20.0
u                  299         1500          324         >20.3
w1                 678         1476           97         >19.2
m2                 653         1451           97         >18.7
w2                 604         5200          313         >19.8
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.996 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #36874
S. Chastain (UNM), J. K. Leung (U. Toronto/HUJI), G. E. Anderson (Curtin University), A. Gulati (U. Sydney), L. Rhodes (U. Oxford), A. J. van der Horst (GWU) on behalf of the PanRadio GRB collaboration
The Australia Telescope Compact Array (ATCA) performed observations of the long GRB 240712A detected by Swift-BAT (Salvaggio et al., GCN 36851), at 5.5, 9, 16.7 and 21.2 GHz as part of the Large ATCA "PanRadio GRB" follow-up programme C3542 (PI. Anderson). ATCA start observing on 2024-07-12 at 4:08 UT (~2 hours post-burst) and continued to observe until 9:21 UT on 2024-07-12. In our preliminary analysis, we find no radio source coincident with the Swift XRT uncataloged source (Salvaggio et al., GCN 36851) with 3 sigma upper limits of 72, 63, 192 and 717 microJy/beam at 5.5, 9.0, 16.7 and 21.2 GHz, respectively.
We thank the CSIRO Space and Astronomy staff for supporting these observations. We acknowledge the Gomeroi people as the traditional owners of the Observatory site. The Australia Telescope Compact Array is part of the Australia Telescope National Facility (https://ror.org/05qajvd42) which is funded by the Australian Government for operation as a National Facility managed by CSIRO.
GCN Circular #36882
P. A. Evans (U. Leicester), K.L. Page (U. Leicester), C. Salvaggio (INAF-OAB), T. Sbarrato (INAF-OAB) and B. Sbarufatti (INAF-OAB) reports on behalf of the Swift-XRT team:
We have analysed 1.7 ks of XRT data for the Swift/BAT-detected burst GRB 240712A, from 152 s to 5.3 ks after the Swift/BAT trigger. The data are entirely in Photon Counting (PC) mode. Using 1421 s of PC mode data and 2 UVOT images, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 122.33591, -37.08814 which is equivalent to:
```
RA (J2000): 08h 09m 20.62s
Dec(J2000): -37d 05' 17.3"
```
with an uncertainty of 3.2 arcsec (radius, 90% confidence). This position is 103 arcsec from the Swift/BAT position.
The light curve can be modelled with a power-law decay with a decay index of alpha=0.9 (+/-0.4).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.5 (+1.1, -1.0). The best-fitting absorption column is 2.6 (+2.5, -1.7) x 10^22 cm^-2, consistent with the Galactic value of 8.9 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 9.0 x 10^-11 (1.4 x 10^-10) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.6 (+2.5, -1.7) x 10^22 cm^-2
Galactic foreground: 8.9 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.5 (+1.1, -1.0)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01242223.
This circular is an official product of the Swift-XRT team.
GCN Circular #36897
T. Parsotan (GSFC), S. D. Barthelmy (GSFC), R. Gupta (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), M. J. Moss (GSFC), D. M. Palmer (LANL), D. Sadaula (GSFC/UMBC), T. Sakamoto (AGU)(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 240712A (trigger #1242223) (Salvaggio et al., GCN Circ. 36851). The BAT ground-calculated position is RA, Dec = 122.385, -37.093 deg which is
```
       RA(J2000)  =  08h 09m 32.3s
       Dec(J2000) = -37d 05' 36.3"
```
with an uncertainty of 2.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 93%.
The BAT light curve shows a complex structure with a duration of ~ 20 sec. T90 (15-350 keV) is 16.45 +- 4.89 sec (estimated error including systematics).
The time-averaged spectrum from T-4.68 to T+12.59 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.29 +- 0.30. The fluence in the 15-150 keV band is 2.7 +- 0.5 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+1.24 sec in the 15-150 keV band is 0.5 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at https://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1242223

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Jochen Greiner, last update: 17-Jul-2024 [Disclaimer]