Gamma-ray Burst 130528A

(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:     Tue 28 May 13 16:43:30 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     556870,   Seg_Num: 0
GRB_RA:          138.911d {+09h 15m 39s} (J2000),
                 140.090d {+09h 20m 22s} (current),
                 134.100d {+08h 56m 24s} (1950)
GRB_DEC:         +87.276d {+87d 16' 33"} (J2000),
                 +87.219d {+87d 13' 08"} (current),
                 +87.478d {+87d 28' 42"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       2023 [cnts]    Image_Peak=160 [image_cnts]
TRIGGER_DUR:     0.512 [sec] 
TRIGGER_INDEX:   124     E_range: 25-100 keV
BKG_INTEN:       19685 [cnts]
BKG_TIME:        60069.39 SOD {16:41:09.39} UT
BKG_DUR:         8 [sec]
GRB_DATE:        16440 TJD;   148 DOY;   13/05/28
GRB_TIME:        60083.91 SOD {16:41:23.91} UT
GRB_PHI:          -9.47 [deg]
GRB_THETA:        18.23 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     20.83 [sigma]
IMAGE_SIGNIF:    9.71 [sigma]
MERIT_PARAMS:     +1  +0  +0  -1  +2  +0  +0  +0 -37  +0 
SUN_POSTN:        65.72d {+04h 22m 52s}  +21.56d {+21d 33' 40"}
SUN_DIST:         67.71 [deg]   Sun_angle= -5.0 [hr] (East of Sun)
MOON_POSTN:      297.95d {+19h 51m 47s}  -15.99d {-15d 59' 34"}
MOON_DIST:       108.57 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      125.44, 28.71 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       94.81, 64.69 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This Notice was delayed by more than 60 sec past the end of the trigger integration interval;  
COMMENTS:        probably due to it occurring during a Malindi downlink session.  
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 = 266.91,14.15 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(0.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=6851).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 28 May 13 16:41:49 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      48
TRIGGER_NUM:     391452087
GRB_RA:          245.483d {+16h 21m 56s} (J2000),
                 245.107d {+16h 20m 26s} (current),
                 246.924d {+16h 27m 42s} (1950)
GRB_DEC:         +82.967d {+82d 58' 00"} (J2000),
                 +82.936d {+82d 56' 08"} (current),
                 +83.079d {+83d 04' 45"} (1950)
GRB_ERROR:       11.07 [deg radius, statistical plus systematic]
GRB_INTEN:       216 [cnts/sec]
DATA_SIGNIF:     11.80 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        16440 TJD;   148 DOY;   13/05/28
GRB_TIME:        60084.41 SOD {16:41:24.41} UT
GRB_PHI:          52.00 [deg]
GRB_THETA:        50.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.67
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,1,1, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:        65.71d {+04h 22m 51s}  +21.56d {+21d 33' 39"}
SUN_DIST:         75.50 [deg]   Sun_angle= -12.0 [hr] (East of Sun)
MOON_POSTN:      297.93d {+19h 51m 43s}  -16.00d {-15d 59' 48"}
MOON_DIST:       101.66 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      116.40, 31.25 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       99.85, 72.73 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 177.48,-10.20 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 28 May 13 16:41:59 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      60
TRIGGER_NUM:     391452087
GRB_RA:          197.083d {+13h 08m 20s} (J2000),
                 196.930d {+13h 07m 43s} (current),
                 197.740d {+13h 10m 58s} (1950)
GRB_DEC:         +86.200d {+86d 12' 00"} (J2000),
                 +86.129d {+86d 07' 43"} (current),
                 +86.466d {+86d 27' 57"} (1950)
GRB_ERROR:       6.67 [deg radius, statistical plus systematic]
GRB_INTEN:       372 [cnts/sec]
DATA_SIGNIF:     27.10 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        16440 TJD;   148 DOY;   13/05/28
GRB_TIME:        60084.41 SOD {16:41:24.41} UT
GRB_PHI:          50.00 [deg]
GRB_THETA:        55.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.46
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,1,1, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:        65.71d {+04h 22m 51s}  +21.56d {+21d 33' 39"}
SUN_DIST:         71.02 [deg]   Sun_angle= -8.7 [hr] (East of Sun)
MOON_POSTN:      297.93d {+19h 51m 43s}  -16.00d {-15d 59' 46"}
MOON_DIST:       106.70 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      122.61, 30.92 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       99.49, 67.40 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 177.48,-10.20 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 28 May 13 16:42:02 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      59
TRIGGER_NUM:     391452087
GRB_RA:          101.980d {+06h 47m 55s} (J2000),
                 102.785d {+06h 51m 08s} (current),
                  98.950d {+06h 35m 48s} (1950)
GRB_DEC:         +83.440d {+83d 26' 24"} (J2000),
                 +83.424d {+83d 25' 26"} (current),
                 +83.491d {+83d 29' 26"} (1950)
GRB_ERROR:       2.90 [deg radius, statistical only]
DATA_SIGNIF:     30.80 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        16440 TJD;   148 DOY;   13/05/28
GRB_TIME:        60084.41 SOD {16:41:24.41} UT
GRB_PHI:          44.00 [deg]
GRB_THETA:        61.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:        65.71d {+04h 22m 51s}  +21.56d {+21d 33' 39"}
SUN_DIST:         63.25 [deg]   Sun_angle= -2.5 [hr] (East of Sun)
MOON_POSTN:      297.93d {+19h 51m 43s}  -16.00d {-15d 59' 46"}
MOON_DIST:       112.34 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      130.29, 26.84 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       92.73, 60.11 [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:     Tue 28 May 13 16:42:08 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      70
TRIGGER_NUM:     391452087
GRB_RA:           84.840d {+05h 39m 22s} (J2000),
                  85.518d {+05h 42m 04s} (current),
                  82.320d {+05h 29m 17s} (1950)
GRB_DEC:         +81.640d {+81d 38' 24"} (J2000),
                 +81.646d {+81d 38' 47"} (current),
                 +81.609d {+81d 36' 32"} (1950)
GRB_ERROR:       2.09 [deg radius, statistical only]
DATA_SIGNIF:     35.90 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        16440 TJD;   148 DOY;   13/05/28
GRB_TIME:        60084.41 SOD {16:41:24.41} UT
GRB_PHI:          41.00 [deg]
GRB_THETA:        62.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:        65.71d {+04h 22m 51s}  +21.56d {+21d 33' 40"}
SUN_DIST:         60.61 [deg]   Sun_angle= -1.3 [hr] (East of Sun)
MOON_POSTN:      297.93d {+19h 51m 43s}  -16.00d {-15d 59' 45"}
MOON_DIST:       112.99 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      131.66, 24.27 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       88.58, 58.23 [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/INTEGRAL NOTICE
NOTICE_DATE:    Tue 28 May 13 16:42:15 UT
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    6851,   Sub_Num: 0
GRB_INTEN:      9.01 [sigma]   
GRB_TIME:       60083.52 SOD {16:41:23.52} UT
GRB_DATE:       16440 TJD;   148 DOY;   13/05/28
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.
COMMENTS:       Time_Scale=2.0000 and Time_Error=1.0000.
COMMENTS:
COMMENTS:       NOTE: This SPIACS event is temporally(1.0<100sec) coincident with the FERMI_GBM event (trignum=391452087).
COMMENTS:
COMMENTS:       The SPIACS lightcurve can be found at:
COMMENTS:       ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2013-05/2013-05-28T16-41-23.3526-04567-35728-0.lc

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 May 13 16:44:16 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     556870,   Seg_Num: 0
GRB_RA:          139.5158d {+09h 18m 03.79s} (J2000),
                 140.6918d {+09h 22m 46.04s} (current),
                 134.7116d {+08h 58m 50.77s} (1950)
GRB_DEC:         +87.3004d {+87d 18' 01.4"} (J2000),
                 +87.2431d {+87d 14' 35.2"} (current),
                 +87.5049d {+87d 30' 17.7"} (1950)
GRB_ERROR:       6.5 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.20e-08 [erg/cm2/sec]
GRB_SIGNIF:      4.47 [sigma]
IMG_START_DATE:  16440 TJD;   148 DOY;   13/05/28
IMG_START_TIME:  60148.77 SOD {16:42:28.77} UT,   64.9 [sec] since BAT Trigger Time
TAM[0-3]:        327.69 237.22 261.57 243.25
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        65.72d {+04h 22m 52s}  +21.56d {+21d 33' 40"}
SUN_DIST:         67.75 [deg]   Sun_angle= -5.0 [hr] (East of Sun)
MOON_POSTN:      297.95d {+19h 51m 49s}  -15.99d {-15d 59' 28"}
MOON_DIST:       108.53 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      125.40, 28.72 [deg] galactic lon,lat of the burst
ECL_COORDS:       94.81, 64.73 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 2.27 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 May 13 16:44:33 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     556870,   Seg_Num: 0
GRB_RA:          139.5158d {+09h 18m 03.7s} (J2000),
                 140.6918d {+09h 22m 46.0s} (current),
                 134.7116d {+08h 58m 50.7s} (1950)
GRB_DEC:         +87.3004d {+87d 18' 01.4"} (J2000),
                 +87.2431d {+87d 14' 35.2"} (current),
                 +87.5049d {+87d 30' 17.7"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       20 [cnts]
IMG_START_DATE:  16440 TJD;   148 DOY;   13/05/28
IMG_START_TIME:  60148.77 SOD {16:42:28.77} UT,   64.9 [sec] since BAT Trigger Time
CENTROID_X:      369.59,  raw= 370  [pixels]
CENTROID_Y:      272.40,  raw= 272  [pixels]
ROLL:            254.09 [deg]
GAIN:            1
MODE:            2, Short Image mode
WAVEFORM:        134
EXPO_TIME:       0.10 [sec]
GRB_POS_XRT_Y:   -60.32
GRB_POS_XRT_Z:   155.32
IMAGE_URL:       sw00556870000msxps_rw.img
SUN_POSTN:        65.72d {+04h 22m 52s}  +21.56d {+21d 33' 40"}
SUN_DIST:         67.75 [deg]   Sun_angle= -5.0 [hr] (East of Sun)
MOON_POSTN:      297.96d {+19h 51m 49s}  -15.99d {-15d 59' 26"}
MOON_DIST:       108.53 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      125.40, 28.72 [deg] galactic lon,lat of the burst
ECL_COORDS:       94.81, 64.73 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 May 13 16:44:27 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     556870,   Seg_Num: 0
GRB_RA:          139.5158d {+09h 18m 03.7s} (J2000),
                 140.6918d {+09h 22m 46.0s} (current),
                 134.7116d {+08h 58m 50.7s} (1950)
GRB_DEC:         +87.3004d {+87d 18' 01.4"} (J2000),
                 +87.2431d {+87d 14' 35.2"} (current),
                 +87.5049d {+87d 30' 17.7"} (1950)
GRB_ERROR:       6.1 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       20 [cnts]
IMG_START_DATE:  16440 TJD;   148 DOY;   13/05/28
IMG_START_TIME:  60148.77 SOD {16:42:28.77} UT,   64.9 [sec] since BAT Trigger Time
CENTROID_X:      369.59,  raw= 370  [pixels]
CENTROID_Y:      272.40,  raw= 272  [pixels]
ROLL:            254.09 [deg]
GAIN:            1
MODE:            2, Short Image mode
WAVEFORM:        134
EXPO_TIME:       0.10 [sec]
GRB_POS_XRT_Y:   -60.32
GRB_POS_XRT_Z:   155.32
IMAGE_URL:       sw00556870000msxps_rw.img
SUN_POSTN:        65.72d {+04h 22m 52s}  +21.56d {+21d 33' 40"}
SUN_DIST:         67.75 [deg]   Sun_angle= -5.0 [hr] (East of Sun)
MOON_POSTN:      297.95d {+19h 51m 49s}  -15.99d {-15d 59' 27"}
MOON_DIST:       108.53 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      125.40, 28.72 [deg] galactic lon,lat of the burst
ECL_COORDS:       94.81, 64.73 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 May 13 16:45:36 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     556870,   Seg_Num: 0
GRB_RA:          138.911d {+09h 15m 39s} (J2000),
                 140.090d {+09h 20m 22s} (current),
                 134.100d {+08h 56m 24s} (1950)
GRB_DEC:         +87.276d {+87d 16' 33"} (J2000),
                 +87.219d {+87d 13' 08"} (current),
                 +87.478d {+87d 28' 42"} (1950)
GRB_DATE:        16440 TJD;   148 DOY;   13/05/28
GRB_TIME:        60083.91 SOD {16:41:23.91} UT
TRIGGER_INDEX:   124
GRB_PHI:          -9.47 [deg]
GRB_THETA:        18.23 [deg]
DELTA_TIME:      -11.00 [sec]
TRIGGER_DUR:     0.512 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     20.83 [sigma]
IMAGE_SIGNIF:    9.71 [sigma]
LC_URL:          sw00556870000msb.lc
SUN_POSTN:        65.72d {+04h 22m 52s}  +21.56d {+21d 33' 41"}
SUN_DIST:         67.71 [deg]   Sun_angle= -5.0 [hr] (East of Sun)
MOON_POSTN:      297.97d {+19h 51m 52s}  -15.99d {-15d 59' 17"}
MOON_DIST:       108.56 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      125.44, 28.71 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       94.81, 64.69 [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 = 266.91,14.15 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 May 13 16:46:53 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     556870,   Seg_Num: 0
POINT_RA:        138.708d {+09h 14m 50s} (J2000)
POINT_DEC:       +87.274d {+87d 16' 27"} (J2000)
POINT_ROLL:      254.070d
IMG_START_DATE:  16440 TJD;   148 DOY;   13/05/28
IMG_START_TIME:  60159.14 SOD {16:42:39.14} UT,   75.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.125
N_STARS:         27
X_OFFSET:        261 [pixels]
Y_OFFSET:        811 [pixels]
X_MAX:           1220 [pixels]
Y_MAX:           1770 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00556870000msufc0075.fits
SUN_POSTN:        65.72d {+04h 22m 52s}  +21.56d {+21d 33' 41"}
SUN_DIST:         67.70 [deg]   Sun_angle= -4.9 [hr] (East of Sun)
MOON_POSTN:      297.98d {+19h 51m 55s}  -15.99d {-15d 59' 07"}
MOON_DIST:       108.56 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      125.45, 28.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       94.79, 64.68 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 May 13 16:47:15 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     556870,   Seg_Num: 0
POINT_RA:        138.708d {+09h 14m 50s} (J2000)
POINT_DEC:       +87.274d {+87d 16' 27"} (J2000)
POINT_ROLL:      254.070d
IMG_START_DATE:  16440 TJD;   148 DOY;   13/05/28
IMG_START_TIME:  60159.14 SOD {16:42:39.14} UT,   75.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.125
N_STARS:         27
X_OFFSET:        261 [pixels]
Y_OFFSET:        811 [pixels]
X_MAX:           1220 [pixels]
Y_MAX:           1770 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00556870000msufc0075.fits
SUN_POSTN:        65.72d {+04h 22m 52s}  +21.56d {+21d 33' 42"}
SUN_DIST:         67.70 [deg]   Sun_angle= -4.9 [hr] (East of Sun)
MOON_POSTN:      297.98d {+19h 51m 56s}  -15.98d {-15d 59' 04"}
MOON_DIST:       108.56 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      125.45, 28.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       94.79, 64.68 [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:     Tue 28 May 13 16:49:08 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     556870,   Seg_Num: 0
POINT_RA:        138.708d {+09h 14m 50s} (J2000)
POINT_DEC:       +87.274d {+87d 16' 27"} (J2000)
ROLL:            254.070d
IMG_START_DATE:  16440 TJD;   148 DOY;   13/05/28
IMG_START_TIME:  60159.14 SOD {16:42:39.14} UT,   75.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     391452169
X_OFFSET:        581 [pixels]
Y_OFFSET:        1131 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       741
Y_GRB_POS:       1291
BINNING_INDEX:   1
IM_URL:          sw00556870000msuni0086.fits
SUN_POSTN:        65.72d {+04h 22m 53s}  +21.56d {+21d 33' 42"}
SUN_DIST:         67.70 [deg]   Sun_angle= -4.9 [hr] (East of Sun)
MOON_POSTN:      298.00d {+19h 52m 01s}  -15.98d {-15d 58' 49"}
MOON_DIST:       108.56 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      125.45, 28.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       94.79, 64.68 [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:     Tue 28 May 13 16:49:17 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     556870,   Seg_Num: 0
POINT_RA:        138.708d {+09h 14m 50s} (J2000)
POINT_DEC:       +87.274d {+87d 16' 27"} (J2000)
ROLL:            254.070d
IMG_START_DATE:  16440 TJD;   148 DOY;   13/05/28
IMG_START_TIME:  60159.14 SOD {16:42:39.14} UT,   75.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     391452169
X_OFFSET:        581 [pixels]
Y_OFFSET:        1131 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       741
Y_GRB_POS:       1291
BINNING_INDEX:   1
IM_URL:          sw00556870000msuni0086.fits
SUN_POSTN:        65.72d {+04h 22m 53s}  +21.56d {+21d 33' 42"}
SUN_DIST:         67.70 [deg]   Sun_angle= -4.9 [hr] (East of Sun)
MOON_POSTN:      298.00d {+19h 52m 01s}  -15.98d {-15d 58' 48"}
MOON_DIST:       108.56 [deg]
MOON_ILLUM:      83 [%]
GAL_COORDS:      125.45, 28.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       94.79, 64.68 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 May 13 16:55:00 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     556870,   Seg_Num: 0
POINT_RA:        138.732d {+09h 14m 56s} (J2000)
POINT_DEC:       +87.273d {+87d 16' 22"} (J2000)
POINT_ROLL:      254.094d
IMG_START_DATE:  16440 TJD;   148 DOY;   13/05/28
IMG_START_TIME:  60371.08 SOD {16:46:11.08} UT,   287.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.735
N_STARS:         26
X_OFFSET:        261 [pixels]
Y_OFFSET:        811 [pixels]
X_MAX:           1220 [pixels]
Y_MAX:           1770 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00556870000msufc0287.fits
SUN_POSTN:        65.72d {+04h 22m 54s}  +21.56d {+21d 33' 45"}
SUN_DIST:         67.70 [deg]   Sun_angle= -4.9 [hr] (East of Sun)
MOON_POSTN:      298.06d {+19h 52m 15s}  -15.97d {-15d 58' 02"}
MOON_DIST:       108.55 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      125.45, 28.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       94.80, 64.68 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 May 13 16:55:12 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     556870,   Seg_Num: 0
POINT_RA:        138.732d {+09h 14m 56s} (J2000)
POINT_DEC:       +87.273d {+87d 16' 22"} (J2000)
POINT_ROLL:      254.094d
IMG_START_DATE:  16440 TJD;   148 DOY;   13/05/28
IMG_START_TIME:  60371.08 SOD {16:46:11.08} UT,   287.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.735
N_STARS:         26
X_OFFSET:        261 [pixels]
Y_OFFSET:        811 [pixels]
X_MAX:           1220 [pixels]
Y_MAX:           1770 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00556870000msufc0287.fits
SUN_POSTN:        65.72d {+04h 22m 54s}  +21.56d {+21d 33' 45"}
SUN_DIST:         67.70 [deg]   Sun_angle= -4.9 [hr] (East of Sun)
MOON_POSTN:      298.07d {+19h 52m 16s}  -15.97d {-15d 58' 00"}
MOON_DIST:       108.55 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      125.45, 28.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       94.80, 64.68 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #14711
V. D'Elia (ASDC), D. N. Burrows (PSU), C. Gronwall (PSU), J. A. Kennea (PSU), A. Y. Lien (NASA/GSFC/ORAU), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester) and D. M. Palmer (LANL) report on behalf of the Swift Team:
At 16:41:23 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 130528A (trigger=556870). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 138.911, +87.276 which is
```
   RA(J2000) = 09h 15m 39s
   Dec(J2000) = +87d 16' 33"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multiple-peaked structure with a duration of about 85 sec. The peak count rate was ~5500 counts/sec (15-350 keV), at ~8 sec after the trigger.
The XRT began observing the field at 16:42:28.7 UT, 64.9 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source located at RA, Dec 139.51074, 87.30239 which is equivalent to:
```
   RA(J2000)  = 09h 18m 02.58s
   Dec(J2000) = +87d 18' 08.6"
```
with an uncertainty of 4.1 arcseconds (radius, 90% containment). This location is 139 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 (5.18 x 10^20 cm^-2, Kalberla et al. 2005), with an excess column of 1.9 (+2.14/-1.88) x 10^21 cm^-2 (90% confidence).
The initial flux in the 0.1 s image was 1.20e-08 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 75 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 19.6 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 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.16.
Burst Advocate for this burst is V. D'Elia (delia AT asdc.asi.it). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 May 13 16:56:42 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     556870,   Seg_Num: 0
POINT_RA:        138.732d {+09h 14m 56s} (J2000)
POINT_DEC:       +87.273d {+87d 16' 22"} (J2000)
ROLL:            254.094d
IMG_START_DATE:  16440 TJD;   148 DOY;   13/05/28
IMG_START_TIME:  60371.08 SOD {16:46:11.08} UT,   287.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     391452381
X_OFFSET:        581 [pixels]
Y_OFFSET:        1131 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       741
Y_GRB_POS:       1291
BINNING_INDEX:   1
IM_URL:          sw00556870000msuni0298.fits
SUN_POSTN:        65.72d {+04h 22m 54s}  +21.56d {+21d 33' 45"}
SUN_DIST:         67.70 [deg]   Sun_angle= -4.9 [hr] (East of Sun)
MOON_POSTN:      298.08d {+19h 52m 19s}  -15.96d {-15d 57' 48"}
MOON_DIST:       108.54 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      125.45, 28.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       94.80, 64.68 [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:     Tue 28 May 13 16:56:45 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     556870,   Seg_Num: 0
POINT_RA:        138.732d {+09h 14m 56s} (J2000)
POINT_DEC:       +87.273d {+87d 16' 22"} (J2000)
ROLL:            254.094d
IMG_START_DATE:  16440 TJD;   148 DOY;   13/05/28
IMG_START_TIME:  60371.08 SOD {16:46:11.08} UT,   287.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     391452381
X_OFFSET:        581 [pixels]
Y_OFFSET:        1131 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       741
Y_GRB_POS:       1291
BINNING_INDEX:   1
IM_URL:          sw00556870000msuni0298.fits
SUN_POSTN:        65.72d {+04h 22m 54s}  +21.56d {+21d 33' 45"}
SUN_DIST:         67.70 [deg]   Sun_angle= -4.9 [hr] (East of Sun)
MOON_POSTN:      298.08d {+19h 52m 20s}  -15.96d {-15d 57' 47"}
MOON_DIST:       108.54 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      125.45, 28.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       94.80, 64.68 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 May 13 16:56:18 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     556870,   Seg_Num: 0
GRB_RA:          139.5022d {+09h 18m 00.52s} (J2000),
                 140.6787d {+09h 22m 42.89s} (current),
                 134.6959d {+08h 58m 47.01s} (1950)
GRB_DEC:         +87.3010d {+87d 18' 03.6"} (J2000),
                 +87.2437d {+87d 14' 37.4"} (current),
                 +87.5055d {+87d 30' 19.7"} (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:  16440 TJD;   148 DOY;   13/05/28
IMG_START_TIME:  60258.00 SOD {16:44:18.00} UT,   174.1 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        65.72d {+04h 22m 54s}  +21.56d {+21d 33' 45"}
SUN_DIST:         67.75 [deg]   Sun_angle= -5.0 [hr] (East of Sun)
MOON_POSTN:      298.08d {+19h 52m 18s}  -15.96d {-15d 57' 51"}
MOON_DIST:       108.51 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      125.40, 28.72 [deg] galactic lon,lat of the burst
ECL_COORDS:       94.81, 64.73 [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:     Tue 28 May 13 17:01:09 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     556870,   Seg_Num: 0
POINT_RA:        138.738d {+09h 14m 57s} (J2000)
POINT_DEC:       +87.273d {+87d 16' 22"} (J2000)
POINT_ROLL:      254.101d
IMG_START_DATE:  16440 TJD;   148 DOY;   13/05/28
IMG_START_TIME:  60951.43 SOD {16:55:51.43} UT,   867.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.137
N_STARS:         147
X_OFFSET:        21 [pixels]
Y_OFFSET:        571 [pixels]
X_MAX:           1460 [pixels]
Y_MAX:           2010 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    10
SL_URL:          sw00556870000msufc0867.fits
SUN_POSTN:        65.73d {+04h 22m 55s}  +21.56d {+21d 33' 47"}
SUN_DIST:         67.70 [deg]   Sun_angle= -4.9 [hr] (East of Sun)
MOON_POSTN:      298.13d {+19h 52m 30s}  -15.95d {-15d 57' 12"}
MOON_DIST:       108.54 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      125.45, 28.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       94.80, 64.68 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 May 13 17:01:40 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     556870,   Seg_Num: 0
POINT_RA:        138.738d {+09h 14m 57s} (J2000)
POINT_DEC:       +87.273d {+87d 16' 22"} (J2000)
POINT_ROLL:      254.101d
IMG_START_DATE:  16440 TJD;   148 DOY;   13/05/28
IMG_START_TIME:  60951.43 SOD {16:55:51.43} UT,   867.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.137
N_STARS:         147
X_OFFSET:        21 [pixels]
Y_OFFSET:        571 [pixels]
X_MAX:           1460 [pixels]
Y_MAX:           2010 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    10
SL_URL:          sw00556870000msufc0867.fits
SUN_POSTN:        65.73d {+04h 22m 55s}  +21.56d {+21d 33' 47"}
SUN_DIST:         67.70 [deg]   Sun_angle= -4.9 [hr] (East of Sun)
MOON_POSTN:      298.13d {+19h 52m 32s}  -15.95d {-15d 57' 08"}
MOON_DIST:       108.53 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      125.45, 28.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       94.80, 64.68 [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:     Tue 28 May 13 17:02:35 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     556870,   Seg_Num: 0
POINT_RA:        138.738d {+09h 14m 57s} (J2000)
POINT_DEC:       +87.273d {+87d 16' 22"} (J2000)
ROLL:            254.101d
IMG_START_DATE:  16440 TJD;   148 DOY;   13/05/28
IMG_START_TIME:  60951.43 SOD {16:55:51.43} UT,   867.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     391452962
X_OFFSET:        580 [pixels]
Y_OFFSET:        1130 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       740
Y_GRB_POS:       1290
BINNING_INDEX:   1
IM_URL:          sw00556870000msuni0878.fits
SUN_POSTN:        65.73d {+04h 22m 55s}  +21.56d {+21d 33' 48"}
SUN_DIST:         67.70 [deg]   Sun_angle= -4.9 [hr] (East of Sun)
MOON_POSTN:      298.14d {+19h 52m 34s}  -15.95d {-15d 57' 00"}
MOON_DIST:       108.53 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      125.45, 28.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       94.80, 64.68 [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:     Tue 28 May 13 17:02:46 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     556870,   Seg_Num: 0
POINT_RA:        138.738d {+09h 14m 57s} (J2000)
POINT_DEC:       +87.273d {+87d 16' 22"} (J2000)
ROLL:            254.101d
IMG_START_DATE:  16440 TJD;   148 DOY;   13/05/28
IMG_START_TIME:  60951.43 SOD {16:55:51.43} UT,   867.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     391452962
X_OFFSET:        580 [pixels]
Y_OFFSET:        1130 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       740
Y_GRB_POS:       1290
BINNING_INDEX:   1
IM_URL:          sw00556870000msuni0878.fits
SUN_POSTN:        65.73d {+04h 22m 55s}  +21.56d {+21d 33' 48"}
SUN_DIST:         67.70 [deg]   Sun_angle= -4.9 [hr] (East of Sun)
MOON_POSTN:      298.14d {+19h 52m 34s}  -15.95d {-15d 56' 59"}
MOON_DIST:       108.53 [deg]
MOON_ILLUM:      82 [%]
GAL_COORDS:      125.45, 28.70 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       94.80, 64.68 [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 #14712
A. Volnova (IKI), E. Litvinenko (UBAI), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of GRB 130528A (D'Elia et al., GCN 14711) with 0.4-m telescope of ISON-Kitab observatory starting on May 28 (UT) 17:01:13, i.e. 20 minutes after burst trigger. We took several unfiltered images of 30 s exposure. In the first image we do not detect any source in XRT error circle (D'Elia et al., GCN 14711). A photometry is based on nearby USNO-B1.0 stars:
```
T_start,     T0+,      Exposure,  OT,    UL (3sigma)
(UT)         mid, d    (s)

17:01:13    0.01395    1x30       n/d    17.3
```
A finding chart can be found at http://grb.rssi.ru/GRB130528A/GRB130528A_Kitab_fc.png
GCN Circular #14714
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 842 s of XRT Photon Counting mode data and 1 UVOT images for GRB 130528A, 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 = 139.50051, +87.30103 which is equivalent to:
```
RA (J2000): 09h 18m 0.12s
Dec (J2000): +87d 18' 03.7"
```
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 #14716
A. Melandri (INAF-OAB), B. Sbarufatti (INAF-OAB/PSU), M.C. Stroh (PSU), D.N. Burrows (PSU), J.A. Kennea (PSU), K.L. Page (U. Leicester), C. Pagani (U. Leicester), A.P. Beardmore (U. Leicester), G. Stratta (ASDC) and V. D'Elia report on behalf of the Swift-XRT team:
We have analysed 9.0 ks of XRT data for GRB 130528A (D'Elia et al. GCN Circ. 14711), from 68 s to 22.8 ks after the BAT trigger. The data comprise 842 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN. Circ 14714).
The late-time light curve (from T0+4.9 ks) can be modelled with a power-law decay with a decay index of alpha=1.06 (+/-0.12).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.69 (+/-0.07). The best-fitting absorption column is 3.6 (+/-0.3) x 10^21 cm^-2, in excess of the Galactic value of 5.2 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 1.92 (+/-0.15) and a best-fitting absorption column of 3.6 (+/-0.6) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.4 x 10^-11 (6.9 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     3.6 (+/-0.6) x 10^21 cm^-2
Galactic foreground: 5.2 x 10^20 cm^-2
Excess significance: 8.5 sigma
Photon index:	     1.92 (+/-0.15)
```
If the light curve continues to decay with a power-law decay index of 1.06, the count rate at T+24 hours will be 0.013 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 5.7 x 10^-13 (8.9 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/00556870.
This circular is an official product of the Swift-XRT team.
GCN Circular #14718
J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), V. D'Elia (ASDC), E. E. Fenimore (LANL), 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), G. Sato (ISAS), 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+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 130528A (trigger #556870) (D'Elia, et al., GCN Circ. 14711). The BAT ground-calculated position is RA, Dec = 139.405, 87.300 deg, which is
```
   RA(J2000)  =  09h 17m 37.2s 
   Dec(J2000) = +87d 18' 01.5" 
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted light curve shows several overlapping peaks starting at ~T+0, peaking at ~T+4 sec, and ending at ~T+80 sec. T90 (15-350 keV) is 59.4 +- 3.6 sec (estimated error including systematics).
The time-averaged spectrum from T+0.12 to T+79.34 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.39 +- 0.19, and Epeak of 118.3 +- 79.7 keV (chi squared 42.3 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 5.1 +- 0.2 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+6.06 sec in the 15-150 keV band is 3.0 +- 0.2 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.67 +- 0.05 (chi squared 48.6 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/556870/BA/
GCN Circular #14721
M. De Pasquale (MSSL-UCL) and V. D'Elia (ASDC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 130528A 75 s after the BAT trigger (D'Elia et al., GCN Circ. 14711). No optical afterglow consistent with the enhanced XRT position (Goad et al. GCN Circ. 14714) 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            75          225          147         >20.3
u_FC               287          537          246         >19.5
white               75        18737         1239         >21.7
v                  617        11553         1245         >19.9
b                  543        18247         1356         >20.8
u                  287        17334         1583         >21.0
w1                 667        22765         1443         >20.7
m2                 641        12459         1179         >20.7
w2                 592         7143          491         >20.5
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.16 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #14722
S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, report:
The long-duration GRB 130528A (Swift-BAT trigger 556870: D'Elia et al., GCN 14711; Cummings et al., GCN 14718) triggered Konus-Wind at T0=3D60085.301s UT (16:41:25.301).
The light curve shows a pulse from ~T0-5 s to ~T0+10s, followed by weaker and softer emission out to ~T0+60s.
The emission is seen up to 7 MeV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB130528_T60085/
As observed by Konus-Wind, the burst had a fluence of (8.0 =B1 0.7)x10-6 erg/cm2, and a 64-ms peak flux, measured from T0+0.640s, of (1.7 =B1 0.2)x10-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum (measured from T0 to T0+57.600 s) is best fit in the 20 keV - 15 MeV range by the cutoff power law model with the following parameters: the photon index alpha =3D -1.30 =B1 0.15, the peak energy Ep =3D 93 =B1 9 keV, chi2 =3D 90/98 dof.
The spectrum at the maximum count rate (measured from T0+0.256 to T0+5.888 s) is best fit in the 20 keV - 15 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha =3D -0.21 =B1 0.23, the high energy photon index beta =3D -2.6 =B1 0.3, the peak energy Ep =3D 142 =B1 14 keV, chi2 =3D 70/97 dof.
All the quoted results are preliminary.
GCN Circular #14729
P. Jenke (UAH) reports on behalf of the Fermi GBM Team:
"At 16:41:21.41 UT on May 28 2013, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 130528A (trigger 391452087 / 130528695), which was also detected by the Swift/BAT (D'Elia et al., GCN 14711). The GBM on-ground location is consistent with the Swift position.
The angle of the Fermi LAT boresight is 60 degrees from the Swift location.
The GBM light curve consists of at least three peaks with a duration (T90) of about 55 s (50-300 keV). The time-averaged spectrum from T0-0.9 s to T0+58.5 s is well fit by a power law function with an exponential high-energy cutoff. The power law index is -1.12 +/- 0.04 and the cutoff energy, parameterized as Epeak, is 130 +/- 7 keV.
The event fluence (10-1000 keV) in this time interval is (9.5 +/- 0.3)E-06 erg/cm^2. The 1.0-sec peak photon flux measured starting from T0+3.2 s in the 10-1000 keV band is 5.5 +/- 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 Report 431.1
GCN_Report 431.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_431_1.pdf by V.DElia at ASDC titled: "Swift Observations of GRB 130528A"

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Jochen Greiner, last update: 30-May-2013 [Disclaimer]