Gamma-ray Burst 101024A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 24 Oct 10 11:39:46 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     437016,   Seg_Num: 0
GRB_RA:           66.475d {+04h 25m 54s} (J2000),
                  66.370d {+04h 25m 29s} (current),
                  66.969d {+04h 27m 53s} (1950)
GRB_DEC:         -77.248d {-77d 14' 50"} (J2000),
                 -77.224d {-77d 13' 24"} (current),
                 -77.358d {-77d 21' 27"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       1627 [cnts]    Image_Peak=185 [image_cnts]
TRIGGER_DUR:     0.256 [sec] 
TRIGGER_INDEX:   123     E_range: 25-100 keV
BKG_INTEN:       24484 [cnts]
BKG_TIME:        41953.69 SOD {11:39:13.69} UT
BKG_DUR:         8 [sec]
GRB_DATE:        15493 TJD;   297 DOY;   10/10/24
GRB_TIME:        41969.82 SOD {11:39:29.82} UT
GRB_PHI:         178.76 [deg]
GRB_THETA:        30.96 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     29.69 [sigma]
IMAGE_SIGNIF:    11.55 [sigma]
MERIT_PARAMS:     +1  +0  +0  -2  +2  +1  +0  +0  -2  +0 
SUN_POSTN:       208.82d {+13h 55m 17s}  -11.80d {-11d 48' 14"}
SUN_DIST:         88.40 [deg]   Sun_angle= 9.5 [hr] (West of Sun)
MOON_POSTN:       43.76d {+02h 55m 02s}  +20.64d {+20d 38' 21"}
MOON_DIST:        98.78 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      290.53,-34.14 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      293.54,-77.25 [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 = 175.82,-7.59 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 24 Oct 10 11:39:50 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     309613175
GRB_RA:          157.467d {+10h 29m 52s} (J2000),
                 157.538d {+10h 30m 09s} (current),
                 157.134d {+10h 28m 32s} (1950)
GRB_DEC:         -70.917d {-70d 54' 59"} (J2000),
                 -70.972d {-70d 58' 19"} (current),
                 -70.660d {-70d 39' 34"} (1950)
GRB_ERROR:       19.15 [deg radius, statistical plus systematic]
GRB_INTEN:       91 [cnts/sec]
DATA_SIGNIF:     5.20 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        15493 TJD;   297 DOY;   10/10/24
GRB_TIME:        41973.60 SOD {11:39:33.60} UT
GRB_PHI:         354.00 [deg]
GRB_THETA:       120.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.63
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,0,0, 0,1,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       208.82d {+13h 55m 17s}  -11.80d {-11d 48' 14"}
SUN_DIST:         66.86 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:       43.76d {+02h 55m 02s}  +20.64d {+20d 38' 21"}
MOON_DIST:       117.15 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      291.80,-11.17 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      220.83,-66.48 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.
COMMENTS:        This trigger occurred at longitude,latitude =37.57,-3.80 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 24 Oct 10 11:40:18 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     309613175
GRB_RA:          163.860d {+10h 55m 26s} (J2000),
                 163.931d {+10h 55m 43s} (current),
                 163.533d {+10h 54m 08s} (1950)
GRB_DEC:         -76.140d {-76d 08' 23"} (J2000),
                 -76.198d {-76d 11' 51"} (current),
                 -75.873d {-75d 52' 21"} (1950)
GRB_ERROR:       5.69 [deg radius, statistical only]
DATA_SIGNIF:     6.80 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        15493 TJD;   297 DOY;   10/10/24
GRB_TIME:        41973.60 SOD {11:39:33.60} UT
GRB_PHI:           0.00 [deg]
GRB_THETA:       122.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:       208.82d {+13h 55m 17s}  -11.80d {-11d 48' 15"}
SUN_DIST:         68.65 [deg]   Sun_angle= 3.0 [hr] (West of Sun)
MOON_POSTN:       43.76d {+02h 55m 03s}  +20.64d {+20d 38' 24"}
MOON_DIST:       117.03 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      296.03,-14.85 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      234.71,-66.53 [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:     Sun 24 Oct 10 11:40:22 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      65
TRIGGER_NUM:     309613175
GRB_RA:          157.830d {+10h 31m 19s} (J2000),
                 157.851d {+10h 31m 24s} (current),
                 157.726d {+10h 30m 54s} (1950)
GRB_DEC:         -79.030d {-79d 01' 47"} (J2000),
                 -79.086d {-79d 05' 08"} (current),
                 -78.772d {-78d 46' 19"} (1950)
GRB_ERROR:       5.92 [deg radius, statistical only]
DATA_SIGNIF:     10.90 [sigma]
DATA_INTERVAL:   1.024 [sec]
GRB_DATE:        15493 TJD;   297 DOY;   10/10/24
GRB_TIME:        41973.60 SOD {11:39:33.60} UT
GRB_PHI:           2.00 [deg]
GRB_THETA:       125.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:       208.82d {+13h 55m 17s}  -11.80d {-11d 48' 15"}
SUN_DIST:         71.48 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:       43.76d {+02h 55m 03s}  +20.64d {+20d 38' 25"}
MOON_DIST:       114.74 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      296.34,-18.00 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      241.50,-68.32 [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:     Sun 24 Oct 10 11:40:53 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     437016,   Seg_Num: 0
POINT_RA:         66.481d {+04h 25m 56s} (J2000)
POINT_DEC:       -77.248d {-77d 14' 53"} (J2000)
IMG_START_DATE:  15493 TJD;   297 DOY;   10/10/24
IMG_START_TIME:  42046.82 SOD {11:40:46.82} UT,   77.0 [sec] since BAT Trigger Time
COUNTS:          5    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:     Sun 24 Oct 10 11:43:18 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     437016,   Seg_Num: 0
GRB_RA:           66.475d {+04h 25m 54s} (J2000),
                  66.370d {+04h 25m 29s} (current),
                  66.969d {+04h 27m 53s} (1950)
GRB_DEC:         -77.248d {-77d 14' 50"} (J2000),
                 -77.224d {-77d 13' 24"} (current),
                 -77.358d {-77d 21' 27"} (1950)
GRB_DATE:        15493 TJD;   297 DOY;   10/10/24
GRB_TIME:        41969.82 SOD {11:39:29.82} UT
TRIGGER_INDEX:   123
GRB_PHI:         178.76 [deg]
GRB_THETA:        30.96 [deg]
DELTA_TIME:      -11.00 [sec]
TRIGGER_DUR:     0.256 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     29.69 [sigma]
IMAGE_SIGNIF:    11.55 [sigma]
LC_URL:          sw00437016000msb.lc
SUN_POSTN:       208.82d {+13h 55m 18s}  -11.81d {-11d 48' 17"}
SUN_DIST:         88.40 [deg]   Sun_angle= 9.5 [hr] (West of Sun)
MOON_POSTN:       43.79d {+02h 55m 10s}  +20.65d {+20d 38' 46"}
MOON_DIST:        98.79 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      290.53,-34.14 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      293.54,-77.25 [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 = 175.82,-7.59 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 24 Oct 10 11:43:49 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     437016,   Seg_Num: 0
POINT_RA:         66.481d {+04h 25m 55s} (J2000)
POINT_DEC:       -77.248d {-77d 14' 53"} (J2000)
POINT_ROLL:      143.263d
IMG_START_DATE:  15493 TJD;   297 DOY;   10/10/24
IMG_START_TIME:  42051.66 SOD {11:40:51.66} UT,   81.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.711
N_STARS:         50
X_OFFSET:        461 [pixels]
Y_OFFSET:        544 [pixels]
X_MAX:           1420 [pixels]
Y_MAX:           1503 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00437016000msufc0081.fits
SUN_POSTN:       208.82d {+13h 55m 18s}  -11.81d {-11d 48' 18"}
SUN_DIST:         88.40 [deg]   Sun_angle= 9.5 [hr] (West of Sun)
MOON_POSTN:       43.79d {+02h 55m 11s}  +20.65d {+20d 38' 50"}
MOON_DIST:        98.79 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      290.53,-34.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.53,-77.25 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 24 Oct 10 11:44:05 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     437016,   Seg_Num: 0
POINT_RA:         66.481d {+04h 25m 55s} (J2000)
POINT_DEC:       -77.248d {-77d 14' 53"} (J2000)
POINT_ROLL:      143.263d
IMG_START_DATE:  15493 TJD;   297 DOY;   10/10/24
IMG_START_TIME:  42051.66 SOD {11:40:51.66} UT,   81.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.711
N_STARS:         50
X_OFFSET:        461 [pixels]
Y_OFFSET:        544 [pixels]
X_MAX:           1420 [pixels]
Y_MAX:           1503 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00437016000msufc0081.fits
SUN_POSTN:       208.82d {+13h 55m 18s}  -11.81d {-11d 48' 18"}
SUN_DIST:         88.40 [deg]   Sun_angle= 9.5 [hr] (West of Sun)
MOON_POSTN:       43.80d {+02h 55m 11s}  +20.65d {+20d 38' 52"}
MOON_DIST:        98.79 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      290.53,-34.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.53,-77.25 [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:     Sun 24 Oct 10 11:45:13 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     437016,   Seg_Num: 0
POINT_RA:         66.481d {+04h 25m 55s} (J2000)
POINT_DEC:       -77.248d {-77d 14' 53"} (J2000)
ROLL:            143.263d
IMG_START_DATE:  15493 TJD;   297 DOY;   10/10/24
IMG_START_TIME:  42051.66 SOD {11:40:51.66} UT,   81.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     309613257
X_OFFSET:        780 [pixels]
Y_OFFSET:        863 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       940
Y_GRB_POS:       1023
BINNING_INDEX:   1
IM_URL:          sw00437016000msuni0088.fits
SUN_POSTN:       208.82d {+13h 55m 18s}  -11.81d {-11d 48' 19"}
SUN_DIST:         88.40 [deg]   Sun_angle= 9.5 [hr] (West of Sun)
MOON_POSTN:       43.81d {+02h 55m 14s}  +20.65d {+20d 39' 00"}
MOON_DIST:        98.79 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      290.53,-34.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.53,-77.25 [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:     Sun 24 Oct 10 11:45:16 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     437016,   Seg_Num: 0
GRB_RA:           66.5061d {+04h 26m 01.46s} (J2000),
                  66.4007d {+04h 25m 36.16s} (current),
                  67.0025d {+04h 28m 00.59s} (1950)
GRB_DEC:         -77.2650d {-77d 15' 54.0"} (J2000),
                 -77.2410d {-77d 14' 27.4"} (current),
                 -77.3749d {-77d 22' 29.6"} (1950)
GRB_ERROR:       3.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15493 TJD;   297 DOY;   10/10/24
IMG_START_TIME:  42069.00 SOD {11:41:09.00} UT,   99.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       208.82d {+13h 55m 18s}  -11.81d {-11d 48' 19"}
SUN_DIST:         88.38 [deg]   Sun_angle= 9.5 [hr] (West of Sun)
MOON_POSTN:       43.81d {+02h 55m 14s}  +20.65d {+20d 39' 00"}
MOON_DIST:        98.81 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      290.55,-34.13 [deg] galactic lon,lat of the burst
ECL_COORDS:      293.46,-77.25 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 24 Oct 10 11:45:31 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     437016,   Seg_Num: 0
POINT_RA:         66.481d {+04h 25m 55s} (J2000)
POINT_DEC:       -77.248d {-77d 14' 53"} (J2000)
ROLL:            143.263d
IMG_START_DATE:  15493 TJD;   297 DOY;   10/10/24
IMG_START_TIME:  42051.66 SOD {11:40:51.66} UT,   81.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     309613257
X_OFFSET:        780 [pixels]
Y_OFFSET:        863 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       940
Y_GRB_POS:       1023
BINNING_INDEX:   1
IM_URL:          sw00437016000msuni0088.fits
SUN_POSTN:       208.82d {+13h 55m 18s}  -11.81d {-11d 48' 19"}
SUN_DIST:         88.40 [deg]   Sun_angle= 9.5 [hr] (West of Sun)
MOON_POSTN:       43.81d {+02h 55m 14s}  +20.65d {+20d 39' 02"}
MOON_DIST:        98.79 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      290.53,-34.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.53,-77.25 [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:     Sun 24 Oct 10 11:50:32 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     437016,   Seg_Num: 0
GRB_RA:           66.5071d {+04h 26m 01.70s} (J2000),
                  66.4017d {+04h 25m 36.40s} (current),
                  67.0035d {+04h 28m 00.84s} (1950)
GRB_DEC:         -77.2655d {-77d 15' 55.8"} (J2000),
                 -77.2415d {-77d 14' 29.2"} (current),
                 -77.3754d {-77d 22' 31.4"} (1950)
GRB_ERROR:       0.6 [arcsec radius, statistical only]
GRB_MAG:         19.25 +/- 0.14 [mag]
FILTER:          10, White
IMG_START_DATE:  15493 TJD;   297 DOY;   10/10/24
IMG_START_TIME:  42055.00 SOD {11:40:55.00} UT,   85.2 [sec] since BAT Trigger Time
SUN_POSTN:       208.83d {+13h 55m 19s}  -11.81d {-11d 48' 23"}
SUN_DIST:         88.38 [deg]   Sun_angle= 9.5 [hr] (West of Sun)
MOON_POSTN:       43.86d {+02h 55m 25s}  +20.66d {+20d 39' 39"}
MOON_DIST:        98.82 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      290.55,-34.13 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      293.46,-77.25 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 24 Oct 10 11:52:26 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     437016,   Seg_Num: 0
POINT_RA:         66.469d {+04h 25m 53s} (J2000)
POINT_DEC:       -77.250d {-77d 15' 00"} (J2000)
POINT_ROLL:      143.275d
IMG_START_DATE:  15493 TJD;   297 DOY;   10/10/24
IMG_START_TIME:  42263.56 SOD {11:44:23.56} UT,   293.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.492
N_STARS:         122
X_OFFSET:        221 [pixels]
Y_OFFSET:        304 [pixels]
X_MAX:           1660 [pixels]
Y_MAX:           1743 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    3
SL_URL:          sw00437016000msufc0293.fits
SUN_POSTN:       208.83d {+13h 55m 19s}  -11.81d {-11d 48' 25"}
SUN_DIST:         88.40 [deg]   Sun_angle= 9.5 [hr] (West of Sun)
MOON_POSTN:       43.87d {+02h 55m 30s}  +20.66d {+20d 39' 53"}
MOON_DIST:        98.80 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      290.54,-34.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.53,-77.25 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 24 Oct 10 11:52:48 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     437016,   Seg_Num: 0
POINT_RA:         66.469d {+04h 25m 53s} (J2000)
POINT_DEC:       -77.250d {-77d 15' 00"} (J2000)
POINT_ROLL:      143.275d
IMG_START_DATE:  15493 TJD;   297 DOY;   10/10/24
IMG_START_TIME:  42263.56 SOD {11:44:23.56} UT,   293.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.492
N_STARS:         122
X_OFFSET:        221 [pixels]
Y_OFFSET:        304 [pixels]
X_MAX:           1660 [pixels]
Y_MAX:           1743 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    3
SL_URL:          sw00437016000msufc0293.fits
SUN_POSTN:       208.83d {+13h 55m 19s}  -11.81d {-11d 48' 25"}
SUN_DIST:         88.40 [deg]   Sun_angle= 9.5 [hr] (West of Sun)
MOON_POSTN:       43.88d {+02h 55m 30s}  +20.67d {+20d 39' 55"}
MOON_DIST:        98.80 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      290.54,-34.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.53,-77.25 [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:     Sun 24 Oct 10 11:53:18 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     437016,   Seg_Num: 0
GRB_RA:           66.5066d {+04h 26m 01.58s} (J2000),
                  66.4012d {+04h 25m 36.28s} (current),
                  67.0030d {+04h 28m 00.71s} (1950)
GRB_DEC:         -77.2651d {-77d 15' 54.3"} (J2000),
                 -77.2411d {-77d 14' 27.7"} (current),
                 -77.3750d {-77d 22' 29.9"} (1950)
GRB_ERROR:       2.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15493 TJD;   297 DOY;   10/10/24
IMG_START_TIME:  42069.00 SOD {11:41:09.00} UT,   99.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       208.83d {+13h 55m 19s}  -11.81d {-11d 48' 26"}
SUN_DIST:         88.38 [deg]   Sun_angle= 9.5 [hr] (West of Sun)
MOON_POSTN:       43.88d {+02h 55m 31s}  +20.67d {+20d 39' 59"}
MOON_DIST:        98.82 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      290.55,-34.13 [deg] galactic lon,lat of the burst
ECL_COORDS:      293.46,-77.25 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 24 Oct 10 11:53:35 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     437016,   Seg_Num: 0
POINT_RA:         66.469d {+04h 25m 53s} (J2000)
POINT_DEC:       -77.250d {-77d 15' 00"} (J2000)
ROLL:            143.275d
IMG_START_DATE:  15493 TJD;   297 DOY;   10/10/24
IMG_START_TIME:  42263.56 SOD {11:44:23.56} UT,   293.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     309613469
X_OFFSET:        780 [pixels]
Y_OFFSET:        863 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       940
Y_GRB_POS:       1023
BINNING_INDEX:   1
IM_URL:          sw00437016000msuni0300.fits
SUN_POSTN:       208.83d {+13h 55m 19s}  -11.81d {-11d 48' 26"}
SUN_DIST:         88.40 [deg]   Sun_angle= 9.5 [hr] (West of Sun)
MOON_POSTN:       43.88d {+02h 55m 32s}  +20.67d {+20d 40' 01"}
MOON_DIST:        98.80 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      290.54,-34.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.53,-77.25 [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:     Sun 24 Oct 10 11:53:57 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     437016,   Seg_Num: 0
POINT_RA:         66.469d {+04h 25m 53s} (J2000)
POINT_DEC:       -77.250d {-77d 15' 00"} (J2000)
ROLL:            143.275d
IMG_START_DATE:  15493 TJD;   297 DOY;   10/10/24
IMG_START_TIME:  42263.56 SOD {11:44:23.56} UT,   293.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     309613469
X_OFFSET:        780 [pixels]
Y_OFFSET:        863 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       940
Y_GRB_POS:       1023
BINNING_INDEX:   1
IM_URL:          sw00437016000msuni0300.fits
SUN_POSTN:       208.83d {+13h 55m 19s}  -11.81d {-11d 48' 26"}
SUN_DIST:         88.40 [deg]   Sun_angle= 9.5 [hr] (West of Sun)
MOON_POSTN:       43.89d {+02h 55m 33s}  +20.67d {+20d 40' 04"}
MOON_DIST:        98.80 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      290.54,-34.14 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      293.53,-77.25 [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 #11370
M. De Pasquale (UCL-MSSL), A. P. Beardmore (U Leicester), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), S. T. Holland (CRESST/USRA/GSFC), P. T. O'Brien (U Leicester), C. Pagani (U Leicester), C. J. Saxton (UCL-MSSL), B. Sbarufatti (INAF-OAB/IASFPA), M. H. Siegel (PSU), M. Stamatikos (OSU/NASA/GSFC) and R. L. C. Starling (U Leicester) report on behalf of the Swift Team:
At 11:39:29.82 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 101024A (trigger=437016). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 66.475, -77.248 which is
```
    RA(J2000) = 04h 25m 54s
    Dec(J2000) = -77d 14' 50"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The lightcurve shows 4 distinct peaks, with the brightest peaking at T0+10s. Duration was about 23s.
The XRT began observing the field at 11:40:46.8 UT, 77.0 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 66.5064, -77.2648 which is equivalent to:
```
    RA(J2000)  = 04h 26m 1.54s
    Dec(J2000) = -77d 15' 53.2"
```
with an uncertainty of 2.1 arcseconds (radius, 90% containment). This location is 66 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at 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 (6.52 x 10^20 cm^-2, Kalberla et al. 2005), with an excess column of 2.2 (+1.39/-1.27) x 10^21 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 81 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
   RA(J2000)  =	04:26:01.73 =  66.50719
   DEC(J2000) = -77:15:55.9  = -77.26552
```
with a 90%-confidence error radius of about 0.64 arc sec. This position is 2.1 arc sec. from the center of the XRT error circle. The estimated magnitude is 19.38 with a 1-sigma error of about 0.15. No correction has been made for the expected extinction corresponding to E(B-V) of 0.09.
Burst Advocate for this burst is M. De Pasquale (mdp@mssl.ucl.ac.uk). 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 #11372
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 614 s of XRT Photon Counting mode data and 1 UVOT images for GRB 101024A, 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 = 66.50630, -77.26539 which is equivalent to:
```
RA (J2000): 04h 26m 1.51s
Dec (J2000): -77d 15' 55.4"
```
with an uncertainty of 1.8 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 #11373
Veli-Pekka Hentunen, Markku Nissinen and Tuomo Salmi (Taurus Hill Observatory, Varkaus, Finland) report:
GRAS06 (Global-Rent-a-Scope, Moorook, Australia) RCOS-16 telescope and SBIG STL-1001E CCD camera were used to detect GRB 101024A optical afterglow. The observations were started at 2010-10-24 11:58:06 (UT) and stopped at 2010-10-24 12:30:00 (UT). Three unfiltered observations with 600s exposure times were made. The afterglow was detected at following position RA 04 26 01.43 and DEC -77 15 55.9 consistent those given by Evans P.A. et al. (GCN 11370) to within positional errors.
The following magnitudes were obtained from the observations using NOMAD1 0127-0023968 (V = 16.94) as the comparison:
```
Tmid(s) + T0    Filter            Exp (sec)    Mag      Mag err   Limit
1416                unfiltered       600            19.2      0.4          21.0
2074                unfiltered       600            20.8      0.8          21.0
2730                unfiltered       600          >21.0                     21.0
```
A jpg image of the 600sec observations is available at the following URL: http://cutenews.kassiopeia.net/data/upimages/GRB101024A.png
GCN Circular #11374
T. N. Ukwatta (GWU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), M. De Pasquale (UCL-MSSL) N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), M. Stamatikos (OSU), J. Tueller (GSFC) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 101024A (trigger #437016) (De Pasquale, et al., GCN Circ. 11370). The BAT ground-calculated position is RA, Dec = 66.465, -77.261 deg, which is
```
   RA(J2000)  =  04h 25m 51.6s 
   Dec(J2000) = -77d 15' 39.7" 
```
with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 76%.
The mask-weighted light curve consists of 4 peats, the first starting at ~T-2 sec, peaking at ~T_zero, then the 3 remaining peaks at T+3 sec, ~T+10, and ~T+18 sec, and returning to background at ~T+30 sec. T90 (15-350 keV) is 18.7 +- 0.5 sec (estimated error including systematics).
The time-averaged spectrum from T-0.3 to T+20.1 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.15 +- 0.31, and Epeak of 60.0 +- 9.3 keV (chi squared 49.9 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 1.5 +- 0.1 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+9.39 sec in the 15-150 keV band is 5.5 +- 0.2 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.84 +- 0.07 (chi squared 66.9 for 57 d.o.f.). 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/437016/BA/
GCN Circular #11375
M. De Pasquale (UCL-MSSL) reports on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 101024A 82 s after the BAT trigger (De Pasquale et al., GCN Circ. 11370). An optical afterglow is detected within the refined XRT error circle (Beardmore et al., GCN Circ. 11372) in the white filter finding chart. The same source is detected very marginally in the sum of the following white filter exposures. It is not found in any other filter, either in single and in summed exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for the first finding chart (FC) exposure and subsequent exposures are:
```
Filter       T_start(s)   T_stop(s)      Exp(s)        Mag

white_FC         82          232          147      19.4 +/- 0.2
u_FC            294          543          246         >20.3
white           573         6068          413   22.3 +/- 0.6 (2.1 sigma)
v               624         6479          413         >20.0
b               549         5864          413         >20.6
u               294         5659          459         >20.6
w1              673         5454          216         >20.1
m2              648         5249          221         >19.7
w2              599         6274          413         >20.5
```
The values quoted above are not corrected for the non-negligible Galactic extinction due to the reddening of E(B-V) = 0.09 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #11378
S. McBreen (UCD/MPE) report on behalf of the Fermi GBM Team:
"At 11:39:33.60 UT on 24 October 2010, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 101024A (trigger 309613175/101024486) which was also detected by the Swift-BAT (De Pasquale et al. 2010, GCN 11370). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 142 degrees.
The GBM light curve consists of three pulses with the first pulse starting about 5 seconds before the trigger. The event has a duration (T90) of about 24 (+/-2) s (50-300 keV). The time-averaged spectrum from T0-0.003 s to T0+19.456 s is adequately fit by a power law function with an exponential high energy cutoff. The power law index is 1.4 (+1.6/-0.8) and the cutoff energy, parameterized as Epeak, is 56.25 (+5.96/-5.54) keV (CSTAT 447 for 359 d.o.f.).
The event fluence (10-1000 keV) in this time interval is (1.2 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+5.5 s in the 8-1000 keV band is 8.2 +/- 0.5 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #11380
GRB 101024A: Zadko observatory - Gingin. Optical observations
-------------------------------------------------------------
M. Laas-Bourez (UWA/ICRAR), A. Klotz (CESR-UPS-CNRS), D. Coward (UWA), D. Blair (UWA), M. Boer (OHP-CNRS), P. Thierry (CESR-UPS-CNRS) report:
We imaged the field of GRB 101024A detected by SWIFT (trigger 437016) with the Zadko robotic telescope (D=100cm) located at the observatory - Gingin, Australia.
The observations started 215s after the GRB trigger (199s after the notice). The elevation of the field increased from 27 degrees above horizon and weather conditions were good with humidity (77%).
We detect a new fading source in the error box given by SWIFT We detected the candidate couterpart mentioned by De Pasquale et al. (GCNC 11370) at the following position (+/- 0.5 arcsec):
```
RA(J2000.0) = 04h26m01s76
DEC(J2000.0) = -77d15m55s64
```
The first image is trailed with a duration of 30.0s (see the description in Klotz et al., 2006, A&A 451, L39). IT was taken between 214.7s - 244.7s after GRB. It will be analyzed later.
Next images show the decay of the OT:
```
OT was R=16.75 between 259s and 289s after GRB, filter C
OT was R=17.07 between 305s and 335s after GRB, filter C
OT was R=17.15 between 349s and 379s after GRB, filter C
OT was R=17.19 between 394s and 424s after GRB, filter C
```
Magnitudes were estimated with the star : NOMAD1 0127-0023961 and are not corrected for galactic dust extinction.
N.B. Galactic coordinates are lon=290.5330 lat=-34.1439
This message may be cited.
http://www.zt.science.uwa.edu.au/
GCN Circular #11381
R.L.C. Starling, P.A. Evans, K.L. Page (U. Leicester) and M. De Pasquale (UCL-MSSL) report on behalf of the Swift-XRT team:
We have analysed 11 ks of Swift XRT data for GRB 101024A (De Pasquale et al. GCN Circ. 11370), from 62 s to 57.2 ks after the BAT trigger. The data comprise 8 s in Windowed Timing (WT) mode (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 11372).
The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=5.0 (+5.0, -3.9). At T+77 s the decay flattens to an alpha of -0.03 (+0.16, -0.18) before breaking again at T+870 s to a final decay with index alpha=1.30 (+0.10, -0.09).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.95 (+0.13, -0.10). The best-fitting absorption column is 1.06 (+0.29, -0.13) x 10^21 cm^-2, in excess of the Galactic value of 6.5 x 10^20 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.0 x 10^-11 (5.1 x 10^-11) erg cm^-2 count^-1.
If the light curve continues to decay with a power-law decay index of 1.30, the count rate at T+24 hours will be 6.0 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.4 x 10^-13 (3.1 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00437016.
This circular is an official product of the Swift-XRT team.
GCN Circular #11382
GRB 101024A: Zadko observatory - Gingin. Optical observations refined analysis
-------------------------------------------------------------------------------
M. Laas-Bourez (UWA/ICRAR), A. Klotz (CESR-UPS-CNRS), D. Coward (UWA), D. Blair (UWA), M. Boer (OHP-CNRS), P. Thierry (CESR-UPS-CNRS) report:
We analyzed carefully early images of GRB101024A taken with the Zadko telescope, Gingin, Australia (see Laas-Bourez et al. 2010 GCNC 11380). Images are unfiltered. Magnitudes are converted into R band using the star NOMAD1 0127-0023961 R=13.61 supposing (V-R)=0.6 for the optical counterpart of the GRB. Magnitudes are not corrected for galactic dust extinction.
```
-------------------------------
start end   Rmag
(s)   (s)
-------------------------------
215   222  16.55 +/-0.15
222   245  16.72 +/-0.15
259   289  16.86 +/-0.12
305   335  17.06 +/-0.12
349   379  17.24 +/-0.12
394   424  17.23 +/-0.12
-------------------------------
```
Considering a law decay in flux proportional to t^-alpha, there is a consistent decrease with alpha ~ 1.1 between 215 and ~ 360 seconds. After 360 seconds, a plateau seems to be reached lasting at least 60 seconds.
Compared to the UVOT data taken in the same range of time (De Pasquale et al. 2010 GCNC 11375) the optical afterglow is very red, consistent with a redshift z>2.
This message may be cited.
<http://www.zt.science.uwa.edu.au/>
GCN Circular #11383
T. Kruehler, F. Olivares, M. Nardini and J. Greiner (all MPE Garching) report on behalf of the GROND team:
GROND (Greiner et al. 2008, PASP 120, 405), mounted at the 2.2m MPG/ESO telescope at La Silla Observatory (Chile), started observations of the field of GRB 101024A (de Pasquale et al., GCN #11370) in g'r'i'z'JHK at 07:42 UT on 2010-10-26, 43.7 h after the burst. We detect the optical afterglow (de Pasquale et al., GCNs #11370, 11375, Hentunen et al., GCN #11373, Laas-Bourez et al., GCNs #11380, 11382) marginally in the r' and i' bands.
Preliminary AB magnitudes and upper limits at a midtime of 08:14 UT on 2010-10-26 in stacked images with 50 min of total integration time in each g'r'i'z' and 40 min in JHK are:
```
g' > 24.1
r' = 24.5 +- 0.3
i' = 23.8 +- 0.2
z' > 23.7
J > 21.8
H > 21.3
K > 20.5
```
These magnitudes have been derived by calibrating the images against the GROND zeropoints and 2MASS field stars and are not corrected for the expected foreground reddening of E(B-V)=0.088 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #11422
Chris Stockdale (Churchill, Victoria, Australia) reports to the AAVSO International High Energy Network the following optical observation of GRB 101024 (GCN #11370, De Pasquale et al.):
Chris Stockdale reports a detection of the optical afterglow of GRB 101024 (GCN #11370, De Pasquale et al.; #11371, De Pasquale et al.; #11373, Hentunen et al.; #11382, Laas-Bourez et al.; #11383 Kruehler et al.), detecting the afterglow at the same position as the Swift UVOT position. The afterglow was observed unfiltered for 24 minutes beginning at 12:42:07 UT on 2010 October 24. Thirteen exposures of 24 minutes were taken for the detection; a median combination of images 2 through 13 having a midpoint time of 12:54:25 UT on 2010 October 24 yields a CR magnitude of 19.3 with calculated S/N of 5.5; the magnitude was measured relative to the R-band catalog magnitude of USNO-B1.0 0127-0023867 (R=15.7). Observations were made using an SBIG ST-7XME CCD camera attached to a 280 mm Schmidt-Cassegrain. The position of the afterglow was imaged for an additional 60 minutes subsequent to these frames, but the source was not detected.
The AAVSO High Energy Network was made possible through grants from the Charles Curry Foundation and NASA.
1104.3028 from 18 Apr 11
B. Gendre et al.: The puzzling temporally variable optical and X-ray afterglow of GRB 101024A
((1) ASDC, Italy, (2) UWA/ICRAR, Australia, (3) UWA, Australia, (4) IRAP, France, (5) OHP/CNRS France, (6) Centre for Backyard Astrophysics, Australia) Aim: To present the optical observations of the afterglow of GRB 101024A and to try to reconcile these observations with the X-ray afterglow data of GRB 101024A using current afterglow models Method: We employ early optical observations using the Zadko Telescope combined with X-ray data and compare with the reverse shock/forward shock model. Results: The early optical light curve reveals a very unusual steep decay index of alpha~5. This is followed by a flattening and possibly a plateau phase coincident with a similar feature in the X-ray. We discuss these observations in the framework of the standard reverse shock/forward shock model and energy injection.We note that the plateau phase might also be the signature of the formation of a new magnetar.
1606.01956 from 8 Jun 16
Amy Lien et al.: The Third Swift Burst Alert Telescope Gamma-Ray Burst Catalog
To date, the Burst Alert Telescope (BAT) onboard Swift has detected ~ 1000 gamma-ray bursts (GRBs), of which ~ 360 GRBs have redshift measurements, ranging from z = 0.03 to z = 9.38. We present the analyses of the BAT-detected GRBs for the past ~ 11 years up through GRB151027B. We report summaries of both the temporal and spectral analyses of the GRB characteristics using event data (i.e., data for each photon within approximately 250 s before and 950 s after the BAT trigger time), and discuss the instrumental sensitivity and selection effects of GRB detections. We also explore the GRB properties with redshift when possible. The result summaries and data products are available at this http URL In addition, we perform searches for GRB emissions before or after the event data using the BAT survey data. We estimate the false detection rate to be only one false detection in this sample. There are 15 ultra-long GRBs (~ 2% of the BAT GRBs) in this search with confirmed emission beyond ~ 1000 s of event data, and only two GRBs (GRB100316D and GRB101024A) with detections in the survey data prior to the starting of event data.

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Jochen Greiner, last update: 08-Jun-2016 [Disclaimer]