Gamma-ray Burst 240824A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 24 Aug 24 01:04:02 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1250282,   Seg_Num: 0
GRB_RA:          213.203d {+14h 12m 49s} (J2000),
                 213.367d {+14h 13m 28s} (current),
                 212.872d {+14h 11m 29s} (1950)
GRB_DEC:         +63.737d {+63d 44' 13"} (J2000),
                 +63.622d {+63d 37' 20"} (current),
                 +63.970d {+63d 58' 13"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       8002 [cnts]    Image_Peak=326 [image_cnts]
TRIGGER_DUR:     4.096 [sec] 
TRIGGER_INDEX:   307     E_range: 50-350 keV
BKG_INTEN:       65881 [cnts]
BKG_TIME:        3749.95 SOD {01:02:29.95} UT
BKG_DUR:         40 [sec]
GRB_DATE:        20546 TJD;   237 DOY;   24/08/24
GRB_TIME:        3805.50 SOD {01:03:25.50} UT
GRB_PHI:         176.26 [deg]
GRB_THETA:        32.43 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     9.84 [sigma]
IMAGE_SIGNIF:    9.89 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +3  +0  +0  +0 -39  +0 
SUN_POSTN:       153.40d {+10h 13m 36s}  +10.98d {+10d 59' 05"}
SUN_DIST:         67.11 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       27.70d {+01h 50m 48s}  +13.46d {+13d 27' 22"}
MOON_DIST:       102.80 [deg]
MOON_ILLUM:      76 [%]
GAL_COORDS:      108.75, 51.09 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      160.05, 66.80 [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 = 126.91,18.26 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 24 Aug 24 01:05:46 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     1250282,   Seg_Num: 0
POINT_RA:        213.185d {+14h 12m 44s} (J2000)
POINT_DEC:       +63.730d {+63d 43' 47"} (J2000)
IMG_START_DATE:  20546 TJD;   237 DOY;   24/08/24
IMG_START_TIME:  3939.66 SOD {01:05:39.66} UT,   134.2 [sec] since BAT Trigger Time
COUNTS:          1    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        0    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 24 Aug 24 01:07:21 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1250282,   Seg_Num: 0
GRB_RA:          213.203d {+14h 12m 49s} (J2000),
                 213.367d {+14h 13m 28s} (current),
                 212.872d {+14h 11m 29s} (1950)
GRB_DEC:         +63.737d {+63d 44' 13"} (J2000),
                 +63.622d {+63d 37' 20"} (current),
                 +63.970d {+63d 58' 13"} (1950)
GRB_DATE:        20546 TJD;   237 DOY;   24/08/24
GRB_TIME:        3805.50 SOD {01:03:25.50} UT
TRIGGER_INDEX:   307
GRB_PHI:         176.26 [deg]
GRB_THETA:        32.43 [deg]
DELTA_TIME:      45.00 [sec]
TRIGGER_DUR:     4.096 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     9.84 [sigma]
IMAGE_SIGNIF:    9.89 [sigma]
LC_URL:          sw01250282000msb.lc
SUN_POSTN:       153.40d {+10h 13m 36s}  +10.98d {+10d 59' 02"}
SUN_DIST:         67.11 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       27.73d {+01h 50m 56s}  +13.47d {+13d 28' 14"}
MOON_DIST:       102.78 [deg]
MOON_ILLUM:      76 [%]
GAL_COORDS:      108.75, 51.09 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      160.05, 66.80 [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 = 126.91,18.26 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 24 Aug 24 01:10:50 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1250282,   Seg_Num: 0
POINT_RA:        213.183d {+14h 12m 44s} (J2000)
POINT_DEC:       +63.730d {+63d 43' 48"} (J2000)
POINT_ROLL:      247.078d
IMG_START_DATE:  20546 TJD;   237 DOY;   24/08/24
IMG_START_TIME:  3944.86 SOD {01:05:44.86} UT,   139.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.797
N_STARS:         17
X_OFFSET:        413 [pixels]
Y_OFFSET:        608 [pixels]
X_MAX:           1372 [pixels]
Y_MAX:           1567 [pixels]
DET_THRESH:      24
PHOTO_THRESH:    15
SL_URL:          sw01250282000msufc0139.fits
SUN_POSTN:       153.40d {+10h 13m 37s}  +10.98d {+10d 58' 59"}
SUN_DIST:         67.10 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       27.77d {+01h 51m 04s}  +13.49d {+13d 29' 08"}
MOON_DIST:       102.78 [deg]
MOON_ILLUM:      76 [%]
GAL_COORDS:      108.76, 51.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      160.05, 66.79 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 24 Aug 24 01:11:01 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1250282,   Seg_Num: 0
POINT_RA:        213.183d {+14h 12m 44s} (J2000)
POINT_DEC:       +63.730d {+63d 43' 48"} (J2000)
POINT_ROLL:      247.078d
IMG_START_DATE:  20546 TJD;   237 DOY;   24/08/24
IMG_START_TIME:  3944.86 SOD {01:05:44.86} UT,   139.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.797
N_STARS:         17
X_OFFSET:        413 [pixels]
Y_OFFSET:        608 [pixels]
X_MAX:           1372 [pixels]
Y_MAX:           1567 [pixels]
DET_THRESH:      24
PHOTO_THRESH:    15
SL_URL:          sw01250282000msufc0139.fits
SUN_POSTN:       153.40d {+10h 13m 37s}  +10.98d {+10d 58' 59"}
SUN_DIST:         67.10 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       27.77d {+01h 51m 04s}  +13.49d {+13d 29' 11"}
MOON_DIST:       102.78 [deg]
MOON_ILLUM:      76 [%]
GAL_COORDS:      108.76, 51.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      160.05, 66.79 [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:     Sat 24 Aug 24 01:13:14 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1250282,   Seg_Num: 0
POINT_RA:        213.183d {+14h 12m 44s} (J2000)
POINT_DEC:       +63.730d {+63d 43' 48"} (J2000)
ROLL:            247.078d
IMG_START_DATE:  20546 TJD;   237 DOY;   24/08/24
IMG_START_TIME:  3944.86 SOD {01:05:44.86} UT,   139.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     746154378
X_OFFSET:        732 [pixels]
Y_OFFSET:        927 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       892
Y_GRB_POS:       1087
BINNING_INDEX:   1
IM_URL:          sw01250282000msuni0174.fits
SUN_POSTN:       153.40d {+10h 13m 37s}  +10.98d {+10d 58' 57"}
SUN_DIST:         67.10 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       27.79d {+01h 51m 09s}  +13.50d {+13d 29' 46"}
MOON_DIST:       102.77 [deg]
MOON_ILLUM:      76 [%]
GAL_COORDS:      108.76, 51.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      160.05, 66.79 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 24 Aug 24 01:13:23 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1250282,   Seg_Num: 0
POINT_RA:        213.183d {+14h 12m 44s} (J2000)
POINT_DEC:       +63.730d {+63d 43' 48"} (J2000)
ROLL:            247.078d
IMG_START_DATE:  20546 TJD;   237 DOY;   24/08/24
IMG_START_TIME:  3944.86 SOD {01:05:44.86} UT,   139.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     746154378
X_OFFSET:        732 [pixels]
Y_OFFSET:        927 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       892
Y_GRB_POS:       1087
BINNING_INDEX:   1
IM_URL:          sw01250282000msuni0174.fits
SUN_POSTN:       153.40d {+10h 13m 37s}  +10.98d {+10d 58' 57"}
SUN_DIST:         67.10 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       27.79d {+01h 51m 09s}  +13.50d {+13d 29' 48"}
MOON_DIST:       102.77 [deg]
MOON_ILLUM:      76 [%]
GAL_COORDS:      108.76, 51.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      160.05, 66.79 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 24 Aug 24 01:18:51 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1250282,   Seg_Num: 0
POINT_RA:        213.182d {+14h 12m 44s} (J2000)
POINT_DEC:       +63.731d {+63d 43' 50"} (J2000)
POINT_ROLL:      247.075d
IMG_START_DATE:  20546 TJD;   237 DOY;   24/08/24
IMG_START_TIME:  4102.85 SOD {01:08:22.85} UT,   297.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.070
N_STARS:         29
X_OFFSET:        173 [pixels]
Y_OFFSET:        368 [pixels]
X_MAX:           1612 [pixels]
Y_MAX:           1807 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw01250282000msufc0297.fits
SUN_POSTN:       153.41d {+10h 13m 38s}  +10.98d {+10d 58' 52"}
SUN_DIST:         67.10 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       27.84d {+01h 51m 22s}  +13.52d {+13d 31' 13"}
MOON_DIST:       102.75 [deg]
MOON_ILLUM:      76 [%]
GAL_COORDS:      108.76, 51.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      160.05, 66.79 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 24 Aug 24 01:19:08 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1250282,   Seg_Num: 0
POINT_RA:        213.182d {+14h 12m 44s} (J2000)
POINT_DEC:       +63.731d {+63d 43' 50"} (J2000)
POINT_ROLL:      247.075d
IMG_START_DATE:  20546 TJD;   237 DOY;   24/08/24
IMG_START_TIME:  4102.85 SOD {01:08:22.85} UT,   297.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.070
N_STARS:         29
X_OFFSET:        173 [pixels]
Y_OFFSET:        368 [pixels]
X_MAX:           1612 [pixels]
Y_MAX:           1807 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw01250282000msufc0297.fits
SUN_POSTN:       153.41d {+10h 13m 38s}  +10.98d {+10d 58' 52"}
SUN_DIST:         67.10 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       27.84d {+01h 51m 22s}  +13.52d {+13d 31' 18"}
MOON_DIST:       102.75 [deg]
MOON_ILLUM:      76 [%]
GAL_COORDS:      108.76, 51.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      160.05, 66.79 [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:     Sat 24 Aug 24 01:20:14 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1250282,   Seg_Num: 0
POINT_RA:        213.182d {+14h 12m 44s} (J2000)
POINT_DEC:       +63.731d {+63d 43' 50"} (J2000)
ROLL:            247.075d
IMG_START_DATE:  20546 TJD;   237 DOY;   24/08/24
IMG_START_TIME:  4102.85 SOD {01:08:22.85} UT,   297.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     746154536
X_OFFSET:        732 [pixels]
Y_OFFSET:        927 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       892
Y_GRB_POS:       1087
BINNING_INDEX:   1
IM_URL:          sw01250282000msuni0332.fits
SUN_POSTN:       153.41d {+10h 13m 38s}  +10.98d {+10d 58' 51"}
SUN_DIST:         67.10 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       27.85d {+01h 51m 25s}  +13.53d {+13d 31' 35"}
MOON_DIST:       102.74 [deg]
MOON_ILLUM:      76 [%]
GAL_COORDS:      108.76, 51.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      160.05, 66.79 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 24 Aug 24 01:20:23 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1250282,   Seg_Num: 0
POINT_RA:        213.182d {+14h 12m 44s} (J2000)
POINT_DEC:       +63.731d {+63d 43' 50"} (J2000)
ROLL:            247.075d
IMG_START_DATE:  20546 TJD;   237 DOY;   24/08/24
IMG_START_TIME:  4102.85 SOD {01:08:22.85} UT,   297.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     746154536
X_OFFSET:        732 [pixels]
Y_OFFSET:        927 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       892
Y_GRB_POS:       1087
BINNING_INDEX:   1
IM_URL:          sw01250282000msuni0332.fits
SUN_POSTN:       153.41d {+10h 13m 38s}  +10.98d {+10d 58' 51"}
SUN_DIST:         67.10 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       27.85d {+01h 51m 25s}  +13.53d {+13d 31' 37"}
MOON_DIST:       102.74 [deg]
MOON_ILLUM:      76 [%]
GAL_COORDS:      108.76, 51.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      160.05, 66.79 [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 #37253
V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko, G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij (Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias),
D. Buckley (South African Astronomical Observatory),
O.A. Gress, N.M. Budnev, O.Ershova (Irkutsk State University, API),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich (Blagoveschensk Educational State University)
MASTER-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 GRB240824.04 (trigger No 1250282,14h 12m 48.72s , +63d 44m 13.2s, R=0.05) errorbox 461 sec after notice time and 502 sec after trigger time at 2024-08-24 01:11:47 UT, with upper limit up to 14.1 mag. The observations began at zenith distance = 72 deg. The sun altitude is -17.7 deg.
The galactic latitude b = 51 deg., longitude l = 108 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2572659
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

     552 |      MASTER-Tavrida |  P\ |   100 | 12.3 |        
     552 |      MASTER-Tavrida |  P/ |   100 | 13.7 |        
     666 |      MASTER-Tavrida |  P/ |   120 | 14.1 |        
     805 |      MASTER-Tavrida |  P\ |   150 | 12.6 |        
     805 |      MASTER-Tavrida |  P/ |   150 | 14.1 |        
```
The observation and reduction will continue. The message may be cited.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 24 Aug 24 01:25:46 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1250282,   Seg_Num: 0
POINT_RA:        213.182d {+14h 12m 44s} (J2000)
POINT_DEC:       +63.730d {+63d 43' 50"} (J2000)
POINT_ROLL:      247.075d
IMG_START_DATE:  20546 TJD;   237 DOY;   24/08/24
IMG_START_TIME:  4680.52 SOD {01:18:00.52} UT,   875.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.197
N_STARS:         54
X_OFFSET:        173 [pixels]
Y_OFFSET:        368 [pixels]
X_MAX:           1612 [pixels]
Y_MAX:           1807 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    10
SL_URL:          sw01250282000msufc0875.fits
SUN_POSTN:       153.41d {+10h 13m 39s}  +10.98d {+10d 58' 46"}
SUN_DIST:         67.10 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       27.91d {+01h 51m 37s}  +13.55d {+13d 33' 01"}
MOON_DIST:       102.72 [deg]
MOON_ILLUM:      76 [%]
GAL_COORDS:      108.76, 51.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      160.05, 66.79 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 24 Aug 24 01:25:53 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1250282,   Seg_Num: 0
POINT_RA:        213.182d {+14h 12m 44s} (J2000)
POINT_DEC:       +63.730d {+63d 43' 50"} (J2000)
POINT_ROLL:      247.075d
IMG_START_DATE:  20546 TJD;   237 DOY;   24/08/24
IMG_START_TIME:  4680.52 SOD {01:18:00.52} UT,   875.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.197
N_STARS:         54
X_OFFSET:        173 [pixels]
Y_OFFSET:        368 [pixels]
X_MAX:           1612 [pixels]
Y_MAX:           1807 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    10
SL_URL:          sw01250282000msufc0875.fits
SUN_POSTN:       153.41d {+10h 13m 39s}  +10.98d {+10d 58' 46"}
SUN_DIST:         67.10 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       27.91d {+01h 51m 38s}  +13.55d {+13d 33' 03"}
MOON_DIST:       102.72 [deg]
MOON_ILLUM:      76 [%]
GAL_COORDS:      108.76, 51.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      160.05, 66.79 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #37254
S. B. Cenko (GSFC), S. Dichiara (PSU), M. Ferro (INAF-OAB), A. Y. Lien (U Tampa), D. M. Palmer (LANL), C. Salvaggio (INAF-OAB) and A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift Observatory Team:
At 01:03:25 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 240824A (trigger=1250282). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 213.203, +63.737 which is
```
   RA(J2000) = 14h 12m 49s
   Dec(J2000) = +63d 44' 13"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 40 sec. The peak count rate was ~1200 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began observing the field at 01:05:39.6 UT, 134.2 seconds after the BAT trigger. No source was detected in 734 s of promptly downlinked data. We are waiting for the full dataset to detect and localise the XRT counterpart.
UVOT took a finding chart exposure of 150 seconds with the White filter starting 139 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 expected extinction corresponding to E(B-V) of 0.014.
Although we do not see an X-ray or optical counterpart, the high significance of the source detection in BAT (>9 sigma, confirmed by re-imaging on the ground) gives us confidence that this is an astrophysical source.
Burst Advocate for this burst is S. B. Cenko (brad.cenko AT nasa.gov). 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:     Sat 24 Aug 24 01:27:39 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1250282,   Seg_Num: 0
POINT_RA:        213.182d {+14h 12m 44s} (J2000)
POINT_DEC:       +63.730d {+63d 43' 50"} (J2000)
ROLL:            247.075d
IMG_START_DATE:  20546 TJD;   237 DOY;   24/08/24
IMG_START_TIME:  4680.52 SOD {01:18:00.52} UT,   875.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     746155114
X_OFFSET:        732 [pixels]
Y_OFFSET:        927 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       892
Y_GRB_POS:       1087
BINNING_INDEX:   1
IM_URL:          sw01250282000msuni0910.fits
SUN_POSTN:       153.41d {+10h 13m 39s}  +10.98d {+10d 58' 44"}
SUN_DIST:         67.10 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       27.92d {+01h 51m 41s}  +13.56d {+13d 33' 31"}
MOON_DIST:       102.71 [deg]
MOON_ILLUM:      75 [%]
GAL_COORDS:      108.76, 51.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      160.05, 66.79 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 24 Aug 24 01:27:46 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1250282,   Seg_Num: 0
POINT_RA:        213.182d {+14h 12m 44s} (J2000)
POINT_DEC:       +63.730d {+63d 43' 50"} (J2000)
ROLL:            247.075d
IMG_START_DATE:  20546 TJD;   237 DOY;   24/08/24
IMG_START_TIME:  4680.52 SOD {01:18:00.52} UT,   875.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     746155114
X_OFFSET:        732 [pixels]
Y_OFFSET:        927 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       892
Y_GRB_POS:       1087
BINNING_INDEX:   1
IM_URL:          sw01250282000msuni0910.fits
SUN_POSTN:       153.41d {+10h 13m 39s}  +10.98d {+10d 58' 44"}
SUN_DIST:         67.10 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:       27.92d {+01h 51m 42s}  +13.56d {+13d 33' 33"}
MOON_DIST:       102.71 [deg]
MOON_ILLUM:      75 [%]
GAL_COORDS:      108.76, 51.10 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      160.05, 66.79 [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 #37255
Dylan Dutton, Megan Dubay, Donovan Schlekat, Ruide Fu, Daniel Reichart, Joshua Haislip, Vladimir Kouprianov, James Davidson, Edward Murphy, and Carlos Salgado report on behalf of the Skynet Robotic Telescope Network at the University of North Carolina at Chapel Hill.
We observed the field of GRB 240824A with the RRRT telescope located in Virginia. The observation began at 01:49:13 UT on August 24 2024, roughly 46 minutes post-trigger by the Swift-BAT instrument.
We detected a bright object within the uncertainty radius of the Swift localization, at:
```
R.A. (J2000): 14:12:43.899
Dec. (J2000): 63:43:46.805
```
We report the discovery photometry below. The time of the exposure is the middle time.
```
Time Since GRB | Telescope | Filter | Exposure Duration | Mag	 | Mag Error 
2780s          | RRRT      | V      | 70s		| 15.227 | 0.024
```
Our images have been calibrated using stars from the APASS catalog. Additional Skynet observations are ongoing.
GCN Circular #37256
WeiKang Zheng and Alexei V. Filippenko (UC Berkeley) report on behalf of the KAIT GRB team:
The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at
Lick Observatory, responded to the Swift GRB 240824A (Cenko et al.,
GCN 37254) starting at 03:43:04 UT, ~2.67 hours after the burst.
Observations were performed in the clear (roughly R) filter in
twilight condition. A total of 5 x 60s images were obtained. We did
not detect the optical afterglow reported by Dutton et al. (GCN 37255)
in our coadd image, which we estimate the limiting magnitude be ~18.5
mag, indicating the afterglow reported by Dutton et al. (GCN 37255)
has likely faded.
GCN Circular #37258
D. Akl (AUS), S. Antier (OCA), M. Coughlin (UMN), P-A Duverne (APC), P. Hello (IJCLAB), C. Andrade (UMN), I. Tosta e Melo (UniCT-DFA), S. Karpov (FZU), D. Turpin (CEA-Saclay/Irfu), N. Guessoum (AUS), T. Pradier (Unistra/IPHC), A. Klotz (CNRS-OMP-IRAP), M. Boer, S. Gervasoni, C. Limonta (OCA) on behalf of the GRANDMA collaboration:
We imaged the field of GRB 240824A, detected by SWIFT (GCN 37254), with the TAROT-TCA telescope at the Calern observatory. The observations started ~1 min after the GRB trigger (without filter) and finished 150 min later.
We did not detect any optical counterpart within the SWIFT localization error box (3 arcmin radius centered on RA, Dec = 213.203, 63.737 (deg)). We estimate an upper limit of 17.0 mag in Gaia G (5-sigma) up to 5 min post-T0, and an upper limit of 17.3 mag in Gaia G for each 30-minute epoch from 15 - 150 min post-T0.
The data has been reduced by a single data processing pipeline, STDPipe (Karpov et al., 2022).
We also performed force photometry at the location of the Skynet optical afterglow candidate (GCN 37255), at RA, Dec (deg)=213.183, 63.730, and did not detect any optical counterpart, utilizing various exposures, and estimated an upper limit of 17.3 mag in Gaia G (Vega mag, 5-sigma) from 1 min post-T0 to 150 min, consistent with Zheng et al. (GCN 37256). We can not conclude that the candidate found in Dutton et al. (GCN 37255) is a real source.
We use the SkyPortal application (skyportal.io) to monitor our observational campaign.
GRANDMA is a worldwide telescope network (grandma.ijclab.in2p3.fr) devoted to the observation of transients in the context of multi-messenger astrophysics (Antier et al. 2020 MNRAS 49, 5518).
GCN Circular #37259
On August 24 2024 at 02:59:28 UT the Skynet team issued a circular (GCN 37255) reporting the detection of an optical afterglow associated with GRB 240824A.
Upon closer examination of the photometry, it is clear that the source we reported is actually RBI and not astrophysical in origin. This is consistent with the non-detections for the trigger (GCN 37258, 37257, 37256, and 37253).
We apologize for any confusion this error may have caused.
GCN Circular #37263
GRB 240824A: Swift/UVOT Upper Limits
N. P. M. Kuin (UCL-MSSL) and S. B. Cenko (GSFC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 240824A 139 s after the BAT trigger (Cenko et al., GCN Circ. 37254). No optical afterglow consistent with the BAT position 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           139          289          147         >19.8
u_FC               297          547          246         >19.2
white              139         1717          411         >20.6
v                  628         1767          136         >18.7
b                  553         1866          136         >19.5
u                  297         1841          362         >19.5
w1                 677         1817          136         >19.1
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.014 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #37269
A. Tohuvavohu (U. Toronto), D.N. Burrows (PSU), J. D. Gropp (PSU), A.P. Beardmore (U. Leicester), J.P. Osborne (U. Leicester), E. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA), M. Perri (SSDC & INAF-OAR) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
We have analysed 10.4 ks of Photon Counting (PC) mode XRT data for the Swift-BAT-detected burst GRB 240824A, collected between T0+-897 s and T0+40.9 ks.
One uncatalogued X-ray source has been detected consistent with being within 3 arcmin of the Swift-BAT position, however it is not above the RASS limit or shows definitive signs of fading. Therefore, at the present time we cannot identify it as the afterglow. Details of the source are given below:
Source 4:
```
  RA (J2000.0):  213.1710  =  14:12:41.05
  Dec (J2000.0): +63.7283  =  +63:43:41.7
  Error: 5.4 arcsec (radius, 90% conf.)
  Count-rate: (1.26 [+0.55, -0.44])e-3 ct s^-1	 
  Distance: 59 arcsec from Swift-BAT position.
  Flux: (3.0 [+1.3, -1.1])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV)
```
Seven uncatalogued sources were also detected too far from the GRB position to be likely afterglow candidates.
The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/ToO_GRBs/01250282.
This circular is an official product of the Swift-XRT team.
GCN Circular #37271
SVOM/C-GFT team: Chao WU (NAOC), Zhe Kang (CHO)=EF=BC=8CLiping Xin(NAOC),Xuhui Han(NAOC),Pinpin Zhang (NAOC)=EF=BC=8CXiaomeng Lu (NAOC), Zhenwei Li (CHO)= =EF=BC=8CYou Lv (CHO)=EF=BC=8CRuosong Zhang (NAOC)=EF=BC=8CYujie Xiao(NAOC)
SVOM JSWG: Jian-Yan Wei (NAOC, China), Bertrand Cordier (CEA, F), Shuang-Nan Zhang (IHEP, CN), Stephane Basa (LAM, F), Jean-Luc Att=C3=A9ia (IRAP, F), Arnaud Claret (CEA, F), Zi-Gao Dai (USTC, CN), Frederic Daigne (IAP, F), Jin-Song Deng (NAOC, CN), Andrea Goldwurm (APC, F), Diego G=C3=B6tz (CEA, F), Xu-Hui Han (NAOC, CN), Cyril Lachaud (APC, F), En-Wei Liang (GXU, CN), Yu-Lei Qiu (NAOC, CN), Susanna Vergani (Obs. Paris, F), Jing Wang (NAOC, CN), Chao Wu(NAOC, CN), Li-Ping Xin (NAOC, CN), Bing Zhang (UNLV, CN)
We observed the field of the Swift GRB 240824A (Cenko et al., GCN 37254) starting at 11:02:55UT, August 24, 2024, ~10 hr after the burst 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.=3D 43.8243778 deg), Changchun Observatory, National Astronomical Observatories, CAS. It has FOV of 1.28 deg X 1.28 deg with a 4k*4k CMOS detector mounted on the primary focus of 1.2-meter-aperure telescope.
A series of g ,r,and i band images were obtained. We obtained stacked images of r: 245 x 10s,g: 255 x 10s and i:234 x 10s. No optical afterglow was detected for the candidate reported by Evans (GCN 37269) down to the limit magnitude of mag_g=3D20.6 , mag_r=3D20.5, and mag_i=3D20.0.
The photometry was calibrated with UCAC4 catalogs.
We thank the observation assistant Bowen Li at Jilin observatory for their excellent support.
GCN Circular #37272
C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), S. B. Cenko (GSFC), R. Gupta (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), M. J. Moss (GSFC), D. M. Palmer (LANL), T. Parsotan (GSFC), D. Sadaula (GSFC/UMBC), T. Sakamoto (AGU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 240824A (trigger #1250282) (Cenko et al., GCN Circ. 37254). The BAT ground-calculated position is RA, Dec = 213.176, 63.735 deg which is
```
   RA(J2000)  =  14h 12m 42.3s
   Dec(J2000) = +63d 44' 06.7"
```
with an uncertainty of 1.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 72%.
The mask-weighted light curve shows a complex structure that starts at ~T-1 s and ends at ~T+43 s. The main peak occurs at ~T+1 s. T90 (15-350 keV) is 39.47 +- 3.44 sec (estimated error including systematics).
The time-averaged spectrum from T-0.66 to T+43.40 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.30 +- 0.14. The fluence in the 15-150 keV band is 1.3 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-0.02 sec in the 15-150 keV band is 0.7 +- 0.2 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/1250282
GCN Circular #37312
T. Mohan, R. Kumar, V. Swain, V. Bhalerao (IITB), G.C. Anupama, S. Barway (IIA) and K. Angail (IAO) report on behalf of the GIT team:
We observed the field of the Swift GRB 240824A (Cenko et al., GCN 37254) with the 0.7m GROWTH-India Telescope (GIT). The observations started at 2024-08-24 16:57:29 UT, about 16 hours after the Swift BAT trigger. We obtained 6 images of 300s exposure time in r' filter. We did not detect any new source in our stacked image around the coordinates reported by Swift-XRT (Tohuvavohu et al., GCN 37269). The obtained upper limit follows as:
```
-------------------------------------------------------------------------------------------
|    JD (mid)       | t-t0 (days) | Filter |    Exposure (s)    | Limiting Magnitude (AB) | 
| ----------------- | ----------- |------- | ------------------ | ----------------------- |
| 2460547.2170023   |    0.67     |   r'   |        6x300       |          21.4           |
-------------------------------------------------------------------------------------------
```
Our result is consistent with the upper limits reported by (SVOM/C-GFT team, GCN 37271; Swift/UVOT team, GCN 37263; Akl et al., GCN 37258; KAIT GRB team, GCN 37256). The magnitude are calibrated against PanSTARRS DR1 (Chambers et al., 2016) and not corrected for Galactic extinction.
The GROWTH India Telescope (GIT, Kumar et al. 2022) is a 70-cm telescope with a 0.7-degree field of view, set up by the Indian Institute of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB) with funding from DST-SERB and IUSSTF. It is located at the Indian Astronomical Observatory (Hanle), operated by IIA. We acknowledge funding by the IITB alumni batch of 1994, which partially supports the operations of the telescope. Telescope technical details are available at https://sites.google.com/view/growthindia/.

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Jochen Greiner, last update: 27-Aug-2024 [Disclaimer]