Gamma-ray Burst 131024B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 24 Oct 13 21:36:28 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     575754,   Seg_Num: 0
GRB_RA:          144.403d {+09h 37m 37s} (J2000),
                 144.623d {+09h 38m 30s} (current),
                 143.602d {+09h 34m 25s} (1950)
GRB_DEC:         +44.240d {+44d 14' 23"} (J2000),
                 +44.177d {+44d 10' 37"} (current),
                 +44.465d {+44d 27' 54"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       14735 [cnts]    Image_Peak=250 [image_cnts]
TRIGGER_DUR:     4.096 [sec] 
TRIGGER_INDEX:   488     E_range: 50-350 keV
BKG_INTEN:       127944 [cnts]
BKG_TIME:        77676.80 SOD {21:34:36.80} UT
BKG_DUR:         40 [sec]
GRB_DATE:        16589 TJD;   297 DOY;   13/10/24
GRB_TIME:        77731.40 SOD {21:35:31.40} UT
GRB_PHI:          82.60 [deg]
GRB_THETA:        28.28 [deg]
SOLN_STATUS:     0x20000083
RATE_SIGNIF:     10.77 [sigma]
IMAGE_SIGNIF:    6.93 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +3  -3  +0  +0 -15  +0 
SUN_POSTN:       209.48d {+13h 57m 55s}  -12.04d {-12d 02' 30"}
SUN_DIST:         81.22 [deg]   Sun_angle= 4.3 [hr] (West of Sun)
MOON_POSTN:       99.41d {+06h 37m 39s}  +18.48d {+18d 29' 01"}
MOON_DIST:        45.56 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      175.92, 47.81 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      131.43, 28.31 [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:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 189.14,13.72 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(3.0<100sec) coincident with the FERMI_GBM event (trignum=404343331).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 24 Oct 13 21:35:53 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     404343331
GRB_RA:          160.783d {+10h 43m 08s} (J2000),
                 161.003d {+10h 44m 01s} (current),
                 159.982d {+10h 39m 56s} (1950)
GRB_DEC:         +59.767d {+59d 46' 00"} (J2000),
                 +59.694d {+59d 41' 39"} (current),
                 +60.029d {+60d 01' 44"} (1950)
GRB_ERROR:       29.17 [deg radius, statistical plus systematic]
GRB_INTEN:       45 [cnts/sec]
DATA_SIGNIF:     4.90 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        16589 TJD;   297 DOY;   13/10/24
GRB_TIME:        77728.85 SOD {21:35:28.85} UT
GRB_PHI:         270.98 [deg]
GRB_THETA:        65.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.58
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      93%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,0, 1,0,0, 0,1,1, 0,0,0, 0,0,
SUN_POSTN:       209.48d {+13h 57m 54s}  -12.04d {-12d 02' 29"}
SUN_DIST:         81.54 [deg]   Sun_angle= 3.2 [hr] (West of Sun)
MOON_POSTN:       99.41d {+06h 37m 38s}  +18.48d {+18d 29' 03"}
MOON_DIST:        59.91 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      147.90, 50.69 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      133.80, 46.62 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 244.45,-7.10 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 24 Oct 13 21:36:06 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     404343331
GRB_RA:          133.380d {+08h 53m 31s} (J2000),
                 133.613d {+08h 54m 27s} (current),
                 132.534d {+08h 50m 08s} (1950)
GRB_DEC:         +45.110d {+45d 06' 36"} (J2000),
                 +45.057d {+45d 03' 25"} (current),
                 +45.300d {+45d 17' 59"} (1950)
GRB_ERROR:       14.35 [deg radius, statistical only]
DATA_SIGNIF:     5.20 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        16589 TJD;   297 DOY;   13/10/24
GRB_TIME:        77728.85 SOD {21:35:28.85} UT
GRB_PHI:         270.00 [deg]
GRB_THETA:        87.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       209.48d {+13h 57m 54s}  -12.04d {-12d 02' 29"}
SUN_DIST:         88.79 [deg]   Sun_angle= 5.1 [hr] (West of Sun)
MOON_POSTN:       99.41d {+06h 37m 39s}  +18.48d {+18d 29' 02"}
MOON_DIST:        38.88 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      175.40, 39.94 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      122.79, 26.48 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 24 Oct 13 21:36:12 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      65
TRIGGER_NUM:     404343331
GRB_RA:          130.290d {+08h 41m 10s} (J2000),
                 130.535d {+08h 42m 08s} (current),
                 129.401d {+08h 37m 36s} (1950)
GRB_DEC:         +49.180d {+49d 10' 48"} (J2000),
                 +49.130d {+49d 07' 49"} (current),
                 +49.358d {+49d 21' 30"} (1950)
GRB_ERROR:       9.60 [deg radius, statistical only]
DATA_SIGNIF:     5.90 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        16589 TJD;   297 DOY;   13/10/24
GRB_TIME:        77728.85 SOD {21:35:28.85} UT
GRB_PHI:         266.00 [deg]
GRB_THETA:        85.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       209.48d {+13h 57m 55s}  -12.04d {-12d 02' 29"}
SUN_DIST:         92.01 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:       99.41d {+06h 37m 39s}  +18.48d {+18d 29' 02"}
MOON_DIST:        39.56 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      170.19, 37.81 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      119.13, 29.73 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 24 Oct 13 21:37:53 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     575754,   Seg_Num: 0
GRB_RA:          144.5029d {+09h 38m 00.69s} (J2000),
                 144.7233d {+09h 38m 53.58s} (current),
                 143.7026d {+09h 34m 48.62s} (1950)
GRB_DEC:         +44.2712d {+44d 16' 16.3"} (J2000),
                 +44.2085d {+44d 12' 30.6"} (current),
                 +44.4967d {+44d 29' 48.2"} (1950)
GRB_ERROR:       6.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       5.91e-10 [erg/cm2/sec]
GRB_SIGNIF:      4.69 [sigma]
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  77841.85 SOD {21:37:21.85} UT,   110.5 [sec] since BAT Trigger Time
TAM[0-3]:        327.67 237.22 261.63 243.45
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       209.48d {+13h 57m 55s}  -12.04d {-12d 02' 31"}
SUN_DIST:         81.17 [deg]   Sun_angle= 4.3 [hr] (West of Sun)
MOON_POSTN:       99.43d {+06h 37m 42s}  +18.48d {+18d 28' 57"}
MOON_DIST:        45.63 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      175.86, 47.88 [deg] galactic lon,lat of the burst
ECL_COORDS:      131.49, 28.36 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 4.69 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 24 Oct 13 21:38:07 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     575754,   Seg_Num: 0
GRB_RA:          144.5029d {+09h 38m 00.6s} (J2000),
                 144.7233d {+09h 38m 53.5s} (current),
                 143.7026d {+09h 34m 48.6s} (1950)
GRB_DEC:         +44.2712d {+44d 16' 16.3"} (J2000),
                 +44.2085d {+44d 12' 30.6"} (current),
                 +44.4967d {+44d 29' 48.2"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       22 [cnts]
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  77841.85 SOD {21:37:21.85} UT,   110.5 [sec] since BAT Trigger Time
CENTROID_X:      264.88,  raw= 265  [pixels]
CENTROID_Y:      373.66,  raw= 374  [pixels]
ROLL:            116.29 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   178.36
GRB_POS_XRT_Z:   -91.49
IMAGE_URL:       sw00575754000msxps_rw.img
SUN_POSTN:       209.48d {+13h 57m 55s}  -12.04d {-12d 02' 31"}
SUN_DIST:         81.17 [deg]   Sun_angle= 4.3 [hr] (West of Sun)
MOON_POSTN:       99.43d {+06h 37m 43s}  +18.48d {+18d 28' 56"}
MOON_DIST:        45.63 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      175.86, 47.88 [deg] galactic lon,lat of the burst
ECL_COORDS:      131.49, 28.36 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 24 Oct 13 21:38:01 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     575754,   Seg_Num: 0
GRB_RA:          144.5029d {+09h 38m 00.6s} (J2000),
                 144.7233d {+09h 38m 53.5s} (current),
                 143.7026d {+09h 34m 48.6s} (1950)
GRB_DEC:         +44.2712d {+44d 16' 16.3"} (J2000),
                 +44.2085d {+44d 12' 30.6"} (current),
                 +44.4967d {+44d 29' 48.2"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       22 [cnts]
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  77841.85 SOD {21:37:21.85} UT,   110.5 [sec] since BAT Trigger Time
CENTROID_X:      264.88,  raw= 265  [pixels]
CENTROID_Y:      373.66,  raw= 374  [pixels]
ROLL:            116.29 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   178.36
GRB_POS_XRT_Z:   -91.49
IMAGE_URL:       sw00575754000msxps_rw.img
SUN_POSTN:       209.48d {+13h 57m 55s}  -12.04d {-12d 02' 31"}
SUN_DIST:         81.17 [deg]   Sun_angle= 4.3 [hr] (West of Sun)
MOON_POSTN:       99.43d {+06h 37m 42s}  +18.48d {+18d 28' 56"}
MOON_DIST:        45.63 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      175.86, 47.88 [deg] galactic lon,lat of the burst
ECL_COORDS:      131.49, 28.36 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 24 Oct 13 21:39:10 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     575754,   Seg_Num: 0
GRB_RA:          144.403d {+09h 37m 37s} (J2000),
                 144.623d {+09h 38m 30s} (current),
                 143.602d {+09h 34m 25s} (1950)
GRB_DEC:         +44.240d {+44d 14' 23"} (J2000),
                 +44.177d {+44d 10' 37"} (current),
                 +44.465d {+44d 27' 54"} (1950)
GRB_DATE:        16589 TJD;   297 DOY;   13/10/24
GRB_TIME:        77731.40 SOD {21:35:31.40} UT
TRIGGER_INDEX:   488
GRB_PHI:          82.60 [deg]
GRB_THETA:        28.28 [deg]
DELTA_TIME:      -18.00 [sec]
TRIGGER_DUR:     4.096 [sec] 
SOLN_STATUS:     0x83
RATE_SIGNIF:     10.77 [sigma]
IMAGE_SIGNIF:    6.93 [sigma]
LC_URL:          sw00575754000msb.lc
SUN_POSTN:       209.48d {+13h 57m 55s}  -12.04d {-12d 02' 32"}
SUN_DIST:         81.22 [deg]   Sun_angle= 4.3 [hr] (West of Sun)
MOON_POSTN:       99.44d {+06h 37m 45s}  +18.48d {+18d 28' 53"}
MOON_DIST:        45.55 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      175.92, 47.81 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      131.43, 28.31 [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:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 189.14,13.72 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 24 Oct 13 21:40:43 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     575754,   Seg_Num: 0
POINT_RA:        144.441d {+09h 37m 46s} (J2000)
POINT_DEC:       +44.238d {+44d 14' 16"} (J2000)
POINT_ROLL:      116.295d
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  77851.82 SOD {21:37:31.82} UT,   120.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        0.669
N_STARS:         190
X_OFFSET:        453 [pixels]
Y_OFFSET:        159 [pixels]
X_MAX:           1412 [pixels]
Y_MAX:           1118 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00575754000msufc0120.fits
SUN_POSTN:       209.48d {+13h 57m 55s}  -12.04d {-12d 02' 33"}
SUN_DIST:         81.20 [deg]   Sun_angle= 4.3 [hr] (West of Sun)
MOON_POSTN:       99.45d {+06h 37m 48s}  +18.48d {+18d 28' 48"}
MOON_DIST:        45.56 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      175.92, 47.84 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      131.46, 28.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 24 Oct 13 21:41:03 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     575754,   Seg_Num: 0
POINT_RA:        144.441d {+09h 37m 46s} (J2000)
POINT_DEC:       +44.238d {+44d 14' 16"} (J2000)
POINT_ROLL:      116.295d
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  77851.82 SOD {21:37:31.82} UT,   120.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        0.669
N_STARS:         190
X_OFFSET:        453 [pixels]
Y_OFFSET:        159 [pixels]
X_MAX:           1412 [pixels]
Y_MAX:           1118 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00575754000msufc0120.fits
SUN_POSTN:       209.48d {+13h 57m 55s}  -12.04d {-12d 02' 34"}
SUN_DIST:         81.20 [deg]   Sun_angle= 4.3 [hr] (West of Sun)
MOON_POSTN:       99.45d {+06h 37m 49s}  +18.48d {+18d 28' 47"}
MOON_DIST:        45.56 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      175.92, 47.84 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      131.46, 28.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_srclist.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 24 Oct 13 21:42:10 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     575754,   Seg_Num: 0
POINT_RA:        144.441d {+09h 37m 46s} (J2000)
POINT_DEC:       +44.238d {+44d 14' 16"} (J2000)
ROLL:            116.295d
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  77851.82 SOD {21:37:31.82} UT,   120.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     404343463
X_OFFSET:        773 [pixels]
Y_OFFSET:        479 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       933
Y_GRB_POS:       639
BINNING_INDEX:   1
IM_URL:          sw00575754000msuni0132.fits
SUN_POSTN:       209.48d {+13h 57m 55s}  -12.04d {-12d 02' 35"}
SUN_DIST:         81.20 [deg]   Sun_angle= 4.3 [hr] (West of Sun)
MOON_POSTN:       99.46d {+06h 37m 51s}  +18.48d {+18d 28' 43"}
MOON_DIST:        45.56 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      175.92, 47.84 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      131.46, 28.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 24 Oct 13 21:42:03 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     575754,   Seg_Num: 0
POINT_RA:        144.441d {+09h 37m 46s} (J2000)
POINT_DEC:       +44.238d {+44d 14' 16"} (J2000)
ROLL:            116.295d
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  77851.82 SOD {21:37:31.82} UT,   120.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     404343463
X_OFFSET:        773 [pixels]
Y_OFFSET:        479 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       933
Y_GRB_POS:       639
BINNING_INDEX:   1
IM_URL:          sw00575754000msuni0132.fits
SUN_POSTN:       209.48d {+13h 57m 55s}  -12.04d {-12d 02' 34"}
SUN_DIST:         81.20 [deg]   Sun_angle= 4.3 [hr] (West of Sun)
MOON_POSTN:       99.46d {+06h 37m 51s}  +18.48d {+18d 28' 43"}
MOON_DIST:        45.56 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      175.92, 47.84 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      131.46, 28.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 24 Oct 13 21:44:54 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     575754,   Seg_Num: 0
POINT_RA:        144.443d {+09h 37m 46s} (J2000)
POINT_DEC:       +44.237d {+44d 14' 14"} (J2000)
POINT_ROLL:      116.297d
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  78009.79 SOD {21:40:09.79} UT,   278.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.053
N_STARS:         18
X_OFFSET:        453 [pixels]
Y_OFFSET:        159 [pixels]
X_MAX:           1412 [pixels]
Y_MAX:           1118 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00575754000msufc0278.fits
SUN_POSTN:       209.48d {+13h 57m 56s}  -12.04d {-12d 02' 37"}
SUN_DIST:         81.20 [deg]   Sun_angle= 4.3 [hr] (West of Sun)
MOON_POSTN:       99.49d {+06h 37m 57s}  +18.48d {+18d 28' 34"}
MOON_DIST:        45.54 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      175.92, 47.84 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      131.46, 28.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 24 Oct 13 21:45:09 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     575754,   Seg_Num: 0
POINT_RA:        144.443d {+09h 37m 46s} (J2000)
POINT_DEC:       +44.237d {+44d 14' 14"} (J2000)
POINT_ROLL:      116.297d
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  78009.79 SOD {21:40:09.79} UT,   278.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.053
N_STARS:         18
X_OFFSET:        453 [pixels]
Y_OFFSET:        159 [pixels]
X_MAX:           1412 [pixels]
Y_MAX:           1118 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00575754000msufc0278.fits
SUN_POSTN:       209.48d {+13h 57m 56s}  -12.04d {-12d 02' 37"}
SUN_DIST:         81.20 [deg]   Sun_angle= 4.3 [hr] (West of Sun)
MOON_POSTN:       99.49d {+06h 37m 57s}  +18.48d {+18d 28' 33"}
MOON_DIST:        45.54 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      175.92, 47.84 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      131.46, 28.32 [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:     Thu 24 Oct 13 21:45:38 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     575754,   Seg_Num: 0
GRB_RA:          144.5038d {+09h 38m 00.91s} (J2000),
                 144.7242d {+09h 38m 53.79s} (current),
                 143.7035d {+09h 34m 48.84s} (1950)
GRB_DEC:         +44.2710d {+44d 16' 15.6"} (J2000),
                 +44.2083d {+44d 12' 29.8"} (current),
                 +44.4965d {+44d 29' 47.5"} (1950)
GRB_ERROR:       2.4 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  78010.00 SOD {21:40:10.00} UT,   278.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       209.48d {+13h 57m 56s}  -12.04d {-12d 02' 38"}
SUN_DIST:         81.17 [deg]   Sun_angle= 4.3 [hr] (West of Sun)
MOON_POSTN:       99.49d {+06h 37m 58s}  +18.48d {+18d 28' 32"}
MOON_DIST:        45.59 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      175.86, 47.88 [deg] galactic lon,lat of the burst
ECL_COORDS:      131.49, 28.36 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.11% < P(seren) < 0.58%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 24 Oct 13 21:46:19 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     575754,   Seg_Num: 0
POINT_RA:        144.443d {+09h 37m 46s} (J2000)
POINT_DEC:       +44.237d {+44d 14' 14"} (J2000)
ROLL:            116.297d
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  78009.79 SOD {21:40:09.79} UT,   278.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     404343620
X_OFFSET:        773 [pixels]
Y_OFFSET:        479 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       933
Y_GRB_POS:       639
BINNING_INDEX:   1
IM_URL:          sw00575754000msuni0290.fits
SUN_POSTN:       209.48d {+13h 57m 56s}  -12.04d {-12d 02' 38"}
SUN_DIST:         81.20 [deg]   Sun_angle= 4.3 [hr] (West of Sun)
MOON_POSTN:       99.50d {+06h 38m 00s}  +18.47d {+18d 28' 30"}
MOON_DIST:        45.54 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      175.92, 47.84 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      131.46, 28.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 24 Oct 13 21:46:42 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     575754,   Seg_Num: 0
POINT_RA:        144.443d {+09h 37m 46s} (J2000)
POINT_DEC:       +44.237d {+44d 14' 14"} (J2000)
ROLL:            116.297d
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  78009.79 SOD {21:40:09.79} UT,   278.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     404343620
X_OFFSET:        773 [pixels]
Y_OFFSET:        479 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       933
Y_GRB_POS:       639
BINNING_INDEX:   1
IM_URL:          sw00575754000msuni0290.fits
SUN_POSTN:       209.48d {+13h 57m 56s}  -12.04d {-12d 02' 38"}
SUN_DIST:         81.20 [deg]   Sun_angle= 4.3 [hr] (West of Sun)
MOON_POSTN:       99.50d {+06h 38m 00s}  +18.47d {+18d 28' 28"}
MOON_DIST:        45.53 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      175.92, 47.84 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      131.46, 28.32 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #15371
H. A. Krimm (CRESST/GSFC/USRA), M. M. Chester (PSU), S. T. Holland (STScI), J. A. Kennea (PSU), V. Mangano (PSU), C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC), A. Maselli (INAF-IASFPA), J. L. Racusin (NASA/GSFC), B. Sbarufatti (INAF-OAB/PSU), C. A. Swenson (PSU), E. Troja (NASA/GSFC/UMCP) and B.-B. Zhang (UAH) report on behalf of the Swift Team:
At 21:35:31 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 131024A (trigger=575754). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 144.403, +44.240 which is
```
   RA(J2000) = 09h 37m 37s
   Dec(J2000) = +44d 14' 23"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multiple-peak structure with a duration of about 30 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~2 sec after the trigger.
The XRT began observing the field at 21:37:21.8 UT, 110.5 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source with an enhanced position: RA, Dec 144.5032, 44.2715 which is equivalent to:
```
   RA(J2000)  = 09h 38m 00.76s
   Dec(J2000) = +44d 16' 17.6"
```
with an uncertainty of 2.1 arcseconds (radius, 90% containment). This location is 282 arcseconds from the BAT onboard position. This position may be improved as more data are received; the latest position is available at http://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 (1.27 x 10^20 cm^-2, Kalberla et al. 2005), with an excess column of 2.6 (+1.51/-1.36) x 10^21 cm^-2 (90% confidence).
The initial flux in the 2.5 s image was 5.91e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 250 seconds with the U filter starting 278 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 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.2 mag. 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 18.0 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.02.
Burst Advocate for this burst is H. A. Krimm (krimm AT milkyway.gsfc.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/too.html.)
GCN Circular #15374
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 1402 s of XRT Photon Counting mode data and 2 UVOT images for GRB 131024B, 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 = 144.50331, +44.27151 which is equivalent to:
```
RA (J2000): 09h 38m 0.79s
Dec (J2000): +44d 16' 17.4"
```
with an uncertainty of 2.8 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 #15376
D. Xu (DARK/NBI), X. Zhang, C-H. Bai, A. Esamdin, L. Ma (XAO) report:
We observed the field of GRB 131024B (Krimm et al., GCN 15371) using the 1m telescope located on Mt. Nanshan, Xinjiang, China. We obtained 4x300s R-band frames at a mean time of 2013-10-24 23:21:53 UT, i.e., 1.773 hr after the BAT trigger.
No optical source is detected within the XRT error circle in the stacked image down to a limiting magnitude of R=21.0, calibrated with nearby SDSS field.
GCN Circular #15378
H. A. Krimm (CRESST/GSFC/USRA), A. Maselli (INAF-IASFPA) and P. A. Evans (U. Leicester) report on behalf of the Swift-XRT team:
We have analysed 5.5 ks of XRT data for GRB 131024B (Krimm et al. GCN Circ. 15371), from 100 s to 29.1 ks after the BAT trigger. The data comprise 185 s in Windowed Timing (WT) mode (the first 8 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN. Circ 15374).
The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=1.30 (+0.22, -0.47). At T+232 s the decay steepens to an alpha of 3.4 (+2.8, -1.0) before breaking again at T+328 s to a final decay with index alpha=1.72 (+0.13, -0.11).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.60 (+/-0.14). The best-fitting absorption column is 1.9 (+0.5, -0.4) x 10^21 cm^-2, in excess of the Galactic value of 1.3 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 1.79 (+0.25, -0.23) and a best-fitting absorption column of 1.0 (+/-0.6) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.1 x 10^-11 (5.0 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.0 (+/-0.6) x 10^21 cm^-2
Galactic foreground: 1.3 x 10^20 cm^-2
Excess significance: 2.6 sigma
Photon index:	     1.79 (+0.25, -0.23)
```
If the light curve continues to decay with a power-law decay index of 1.72, the count rate at T+24 hours will be 1.2 x 10^-4 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 5.0 x 10^-15 (6.0 x 10^-15) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00575754.
This circular is an official product of the Swift-XRT team.
GCN Circular #15379
L. P. Xin, J. Y. Wei, Y. L. Qiu, J. S. Deng, J. Wang, X. H. Han and C. Wu on behalf of EAFON report:
We began to observe GRB 131024B (Krimm et al., GCN 15371) with Xinglong 0.8-m TNT telescope at 21:38:56 (UT), about 3.4 min after the burst. 3*300 sec R-band images were obtained.
No any optical counterpart within the XRT error circle was detected down to a limit of 18.4 mag in R band, calibrated by USNO B1.0 R2mag at the mean time of 11.25 min after the burst.
This message may be cited.
GCN Circular #15380
M. M. Chester (PSU) and H. A. Krimm (CRESST/GSFC/USRA) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 131024B 121 s after the BAT trigger (Krimm et al., GCN Circ. 15371). No optical afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 15374) 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 second finding chart (FC) exposure and subsequent exposures are given in the following table. (The first finding chart in White was incomplete and is not included in the analysis.)
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

u_FC               278          528          246         >19.7
white              559         5579          413         >21.8
v                  609         5990          413         >20.6
b                  535         5374          228         >20.5
u                  278         6484          539         >20.3
w1                 658         6401          413         >20.4
m2                4558         6195          393         >20.9
w2                 585         5785          413         >21.3
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.02 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #15381
Antonino Cucchiara (ORAU/GSFC), Nat Butler (ASU), Alan M. Watson (UNAM),=20 Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM)= ,=20 Chris Klein (UCB), Ori Fox (UCB), J. Xavier Prochaska (UCSC), Josh Bloom = (UCB),=20 Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC)= ,=20 Jos=E9 A. de Diego (UNAM), Leonid Georgiev (UNAM), Jes=FAs Gonz=E1lez (UN= AM),=20 Carlos Rom=E1n-Z=FA=F1iga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley= (GSFC) report:
We observed the field of GRB 131024B (Krimm, et al., GCN 15371) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astron=F3mico Nacional = on Sierra San Pedro M=E1rtir from 2013/10 25.41 to 2013/10 25.52 UTC (12.28 to 14.87 hours after the BAT trigger), obtaining a total of 1.78 hours exposure in the r and i bands and 0.74 hours exposure in the Z, Y, J, and H bands.
For a source within the Swift-XRT error circle, in comparison with the SD= SS DR9=20 and 2MASS, we obtain the following upper limits (3-sigma):
```
  r	> 23.68
  i	> 23.35
  Z	> 22.44
  Y	> 22.01
  J	> 21.75
  H	> 21.49
```
These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB.
We thank the staff of the Observatorio Astron=F3mico Nacional in San Pedro M=E1rtir.
GCN Circular #15382
Bin-Bin Zhang (UAH) reports on behalf of the Fermi GBM Team:
"At 21:35:28.85 UT on October 24 2013, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 131024B (trigger 404343331/131024900), which was also detected by Swift (Krimm et al., GCN 15371). The GBM on-ground location is consistent with the Swift/XRT position (Beardmore et al., GCN 15374). The angle from the Fermi LAT boresight is 83 degrees.
The GBM light curve consists of a multiple-peak structure with a duration of about 52 s (50-300 keV). The time-averaged spectrum from T0+0 s to T0+41 s is well best fit with a power law function with an exponential high-energy cutoff parameterized as Epeak = 1047 +/- 627 keV and an Index = -1.01 +/- 0.12. The event fluence (10-1000 keV) in this time interval is (6.35 +/- 0.61)E-06 erg/cm^2. The 1.0-sec peak photon flux measured starting from T0+1 s in the 10-1000 keV band is 1.48 +/- 0.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #15383
W. H. Baumgartner (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-61 to T+242 sec from the recent telemetry downlink, we report further analysis of BAT GRB 131024B (trigger #575754) (Krimm, et al., GCN Circ. 15371). The BAT ground-calculated position is RA, Dec = 144.464, 44.284 deg which is
```
    RA(J2000)  =  09h 37m 51.3s
    Dec(J2000) = +44d 17' 02.1"
```
with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 40%.
The mask-weighted light curve shows activity starting around T-10 sec and continuing to ~T+100 sec. There are several weak peak superimposed. T90 (15-350 keV) is 64.00 +- 22 sec (estimated error including systematics).
The time-averaged spectrum from T-12.59 to T+51.41 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 0.85 +- 0.23. The fluence in the 15-150 keV band is 1.2 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+10.91 sec in the 15-150 keV band is 0.1 +- 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/575754/BA/
GCN Circular #15390
E. Gorbovskoy, V. Lipunov, D. Denisenko, V. Kornilov, A. Kuznetsov, D. Kuvshinov, N. Tyurina, N. Shatskiy, P. Balanutsa, D. Zimnukhov, V.V. Chazov Lomonosov Moscow State University, Sternberg Astronomical Institute
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V. Sennik Kislovodsk Solar Station of the Pulkovo Observatory
K. Ivanov, S. Yazev, N.M. Budnev, O. Gres, O. Chuvalaev, V.A. Poleshchuk Irkutsk State University
V. Yurkov, Yu. Sergienko, D. Varda, E. Sinyakov Blagoveschensk Educational State University, Blagoveschensk
V. Krushinski, I. Zalozhnich, A. Popov, A. Bourdanov Ural Federal University
H. Levato and C. Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
C. Mallamaci, C. Lopez and F. Podest Observatorio Astronomico Felix Aguilar (OAFA)
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Kislovodsk was pointed to the GRB131024B 27 sec s after notice time and 36 sec after GRB time at 2013-10-24T21-36-07.864 UT. On our first (10s exposure) set we haven`t found optical transient within SWIFT error-box (Krimm et. al GCN15371). The 5-sigma upper limit has been about 17.2 mag. This is the prompt observations becaus GRB duration time T_90 = 64+-22 sec (Baumgartner et al., GCN Baumgartner). Such long circular delay was due to with daily power cut on observatory. The message may be cited.
GCN Circular #15391
A.Volnova (IKI), E. Klunko (ISTP), M. Eselevich(ISTP), A. Pozanenko(IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 131024B (Krimm et al., GCN 15371) with AZT-33IK telescope of Sayan observatory (Mondy) starting Oct., 24 (UT) 21:49:49, i.e. in ~14 minutes after the burst trigger. We obtained several images in R-filter with exposure of 30 and 60 seconds. Within the enhanced XRT circle (Beardmore et al., GCN 15374) we did not detect any optical counterpart.
The details of the photometry are the following:
```
UT start,   t-T0          Filter   Exp.  OT   UL (3 sigma)
            (mid, days)            (s)

21:49:49    0.02074       R       1860   n/d   21.8
21:49:49    0.03325       R       4020   n/d   22.5
```
The photometry is based 3 SDSS stars, R (gri -> R transformations by Lupton 2005):
```
SDSS id             R
J093757.56+441843.7 15.803
J093748.35+441919.6 17.774
J093744.86+441756.7 15.530
```
GCN Circular #15392
A. Volnova (IKI), R. Inasaridze (AAO), G. Inasaridze (AAO), V. Zhuzhunadze (AAO), Yu. Krugly (IA KhNU), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of Swift GRB 131024B (Krimm et al., GCN 15371) with AS-32 telescope of Abastumani Observatory starting Oct., 25 (UT) 00:26:12. We obtained several unfiltered images with exposures of 120 s. On stacked images within the enhanced XRT circle (Beardmore et al., GCN 15374) we did not detect any optical counterpart.
The details of the photometry are the following:
```
UT start    t-T0       Filter Exp.     OT      UL (3 sigma)
           (mid, days)         (s)

00:26:12   0.16094     None   46x120   n/d     22.6
```
The photometry is based 3 SDSS stars, R (gri -> R transformations by Lupton 2005):
```
SDSS id             R
J093757.56+441843.7 15.803
J093748.35+441919.6 17.774
J093744.86+441756.7 15.530
```
GCN Circular #15453
Y. Ishida, M. Tashiro, Y. Terada, T. Yasuda, H. Ueno, S. Sugimoto (Saitama U.), M. Ohno, K. Takaki, T. Kawano, R. Nakamura, S. Furui, Y. Fukazawa (Hiroshima U.), M. Yamauchi, N. Ohmori, M. Akiyama (Univ. of Miyazaki), K. Yamaoka (Nagoya U.), S. Sugita (Ehime U.), Y. E. Nakagawa, M. Kokubun, T. Takahashi (ISAS/JAXA), W. Iwakiri (RIKEN), Y. Hanabata (ICRR), Y. Urata (NCU), K. Nakazawa, K. Makishima (Univ. of Tokyo) on behalf of the Suzaku WAM team, report:
The long GRB 131024B (Krimm et al. GCN 15371) was detected by the the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 21:35:31 UT (=T0).
The observed light curve shows a single peak with a duration (T90) of about 45 seconds. The fluence in 100 - 1000 keV was 4.26 (+0.84/-2.27) x 10^-6 erg/cm^2. The 1-s peak flux measured from T0+2 s was 0.73 (+0.26/-0.55) photons/cm^2/s in the same energy range.
Preliminary result shows that the time-averaged spectrum from T0-5 s to T0+5 s is well fitted by a single power-law with a photon index of 2.13 (+0.28/-0.36) (chi^2/d.o.f = 12.4/14).
All the quoted errors are at statistical 90% confidence level, in which the systematic uncertainties are not included.
The light curves for this burst will be available at:
http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/untrig/grb_table.html

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Jochen Greiner, last update: 05-Nov-2013 [Disclaimer]