Gamma-ray Burst 130508A

(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:     Wed 08 May 13 17:10:10 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     555413,   Seg_Num: 0
GRB_RA:          305.312d {+20h 21m 15s} (J2000),
                 305.441d {+20h 21m 46s} (current),
                 304.831d {+20h 19m 19s} (1950)
GRB_DEC:         +34.949d {+34d 56' 58"} (J2000),
                 +34.992d {+34d 59' 33"} (current),
                 +34.789d {+34d 47' 22"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=1747 [image_cnts]
TRIGGER_DUR:     64.000 [sec] 
TRIGGER_INDEX:   20000     E_range: 15-50 keV
BKG_INTEN:       0 [cnts]
BKG_TIME:        0.00 SOD {00:00:00.00} UT
BKG_DUR:         0 [sec]
GRB_DATE:        16420 TJD;   128 DOY;   13/05/08
GRB_TIME:        61733.46 SOD {17:08:53.46} UT
GRB_PHI:          85.88 [deg]
GRB_THETA:        21.02 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    10.58 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  +0  +0  +1  -3  +0 
SUN_POSTN:        45.81d {+03h 03m 13s}  +17.27d {+17d 15' 59"}
SUN_DIST:         88.31 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:       30.79d {+02h 03m 09s}  +13.73d {+13d 43' 58"}
MOON_DIST:        78.42 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:       73.68, -1.00 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      320.85, 52.34 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
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 = 218.89,-9.53 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 08 May 13 17:11:14 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     555413,   Seg_Num: 0
POINT_RA:        305.335d {+20h 21m 20s} (J2000)
POINT_DEC:       +34.955d {+34d 57' 18"} (J2000)
IMG_START_DATE:  16420 TJD;   128 DOY;   13/05/08
IMG_START_TIME:  61863.99 SOD {17:11:03.99} UT,   130.5 [sec] since BAT Trigger Time
COUNTS:          1    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        0    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 08 May 13 17:12:59 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     555413,   Seg_Num: 0
GRB_RA:          305.312d {+20h 21m 15s} (J2000),
                 305.441d {+20h 21m 46s} (current),
                 304.831d {+20h 19m 19s} (1950)
GRB_DEC:         +34.949d {+34d 56' 58"} (J2000),
                 +34.992d {+34d 59' 33"} (current),
                 +34.789d {+34d 47' 22"} (1950)
GRB_DATE:        16420 TJD;   128 DOY;   13/05/08
GRB_TIME:        61733.46 SOD {17:08:53.46} UT
TRIGGER_INDEX:   20000
GRB_PHI:          85.88 [deg]
GRB_THETA:        21.02 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    10.58 [sigma]
LC_URL:          sw00555413000msb.lc
SUN_POSTN:        45.81d {+03h 03m 14s}  +17.27d {+17d 16' 01"}
SUN_DIST:         88.31 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:       30.81d {+02h 03m 15s}  +13.74d {+13d 44' 21"}
MOON_DIST:        78.44 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:       73.68, -1.00 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      320.85, 52.34 [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 an image 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 = 218.89,-9.53 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 08 May 13 17:14:42 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     555413,   Seg_Num: 0
POINT_RA:        305.335d {+20h 21m 20s} (J2000)
POINT_DEC:       +34.955d {+34d 57' 17"} (J2000)
POINT_ROLL:      69.956d
IMG_START_DATE:  16420 TJD;   128 DOY;   13/05/08
IMG_START_TIME:  61869.13 SOD {17:11:09.13} UT,   135.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.529
N_STARS:         157
X_OFFSET:        338 [pixels]
Y_OFFSET:        628 [pixels]
X_MAX:           1297 [pixels]
Y_MAX:           1587 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00555413000msufc0135.fits
SUN_POSTN:        45.81d {+03h 03m 14s}  +17.27d {+17d 16' 02"}
SUN_DIST:         88.29 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:       30.83d {+02h 03m 18s}  +13.74d {+13d 44' 34"}
MOON_DIST:        78.43 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:       73.69, -1.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      320.88, 52.34 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 08 May 13 17:15:13 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     555413,   Seg_Num: 0
POINT_RA:        305.335d {+20h 21m 20s} (J2000)
POINT_DEC:       +34.955d {+34d 57' 17"} (J2000)
POINT_ROLL:      69.956d
IMG_START_DATE:  16420 TJD;   128 DOY;   13/05/08
IMG_START_TIME:  61869.13 SOD {17:11:09.13} UT,   135.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.529
N_STARS:         157
X_OFFSET:        338 [pixels]
Y_OFFSET:        628 [pixels]
X_MAX:           1297 [pixels]
Y_MAX:           1587 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00555413000msufc0135.fits
SUN_POSTN:        45.81d {+03h 03m 14s}  +17.27d {+17d 16' 03"}
SUN_DIST:         88.29 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:       30.83d {+02h 03m 19s}  +13.74d {+13d 44' 38"}
MOON_DIST:        78.43 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:       73.69, -1.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      320.88, 52.34 [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:     Wed 08 May 13 17:15:43 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     555413,   Seg_Num: 0
GRB_RA:          305.3218d {+20h 21m 17.23s} (J2000),
                 305.4505d {+20h 21m 48.11s} (current),
                 304.8401d {+20h 19m 21.61s} (1950)
GRB_DEC:         +34.9565d {+34d 57' 23.3"} (J2000),
                 +34.9995d {+34d 59' 58.3"} (current),
                 +34.7965d {+34d 47' 47.3"} (1950)
GRB_ERROR:       3.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16420 TJD;   128 DOY;   13/05/08
IMG_START_TIME:  61893.00 SOD {17:11:33.00} UT,   159.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        45.81d {+03h 03m 14s}  +17.27d {+17d 16' 03"}
SUN_DIST:         88.30 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:       30.83d {+02h 03m 20s}  +13.75d {+13d 44' 42"}
MOON_DIST:        78.44 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:       73.69, -1.00 [deg] galactic lon,lat of the burst
ECL_COORDS:      320.86, 52.34 [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:     Wed 08 May 13 17:16:05 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     555413,   Seg_Num: 0
POINT_RA:        305.335d {+20h 21m 20s} (J2000)
POINT_DEC:       +34.955d {+34d 57' 17"} (J2000)
ROLL:            69.956d
IMG_START_DATE:  16420 TJD;   128 DOY;   13/05/08
IMG_START_TIME:  61869.13 SOD {17:11:09.13} UT,   135.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     389725879
X_OFFSET:        657 [pixels]
Y_OFFSET:        947 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       817
Y_GRB_POS:       1107
BINNING_INDEX:   1
IM_URL:          sw00555413000msuni0146.fits
SUN_POSTN:        45.81d {+03h 03m 14s}  +17.27d {+17d 16' 03"}
SUN_DIST:         88.29 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:       30.84d {+02h 03m 21s}  +13.75d {+13d 44' 45"}
MOON_DIST:        78.44 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:       73.69, -1.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      320.88, 52.34 [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:     Wed 08 May 13 17:16:19 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     555413,   Seg_Num: 0
POINT_RA:        305.335d {+20h 21m 20s} (J2000)
POINT_DEC:       +34.955d {+34d 57' 17"} (J2000)
ROLL:            69.956d
IMG_START_DATE:  16420 TJD;   128 DOY;   13/05/08
IMG_START_TIME:  61869.13 SOD {17:11:09.13} UT,   135.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     389725879
X_OFFSET:        657 [pixels]
Y_OFFSET:        947 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       817
Y_GRB_POS:       1107
BINNING_INDEX:   1
IM_URL:          sw00555413000msuni0146.fits
SUN_POSTN:        45.81d {+03h 03m 14s}  +17.27d {+17d 16' 03"}
SUN_DIST:         88.29 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:       30.84d {+02h 03m 21s}  +13.75d {+13d 44' 47"}
MOON_DIST:        78.44 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:       73.69, -1.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      320.88, 52.34 [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:     Wed 08 May 13 17:36:52 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     555413,   Seg_Num: 0
POINT_RA:        305.338d {+20h 21m 21s} (J2000)
POINT_DEC:       +34.956d {+34d 57' 23"} (J2000)
POINT_ROLL:      69.957d
IMG_START_DATE:  16420 TJD;   128 DOY;   13/05/08
IMG_START_TIME:  62028.52 SOD {17:13:48.52} UT,   295.1 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.405
N_STARS:         167
X_OFFSET:        98 [pixels]
Y_OFFSET:        388 [pixels]
X_MAX:           1537 [pixels]
Y_MAX:           1827 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00555413000msufc0295.fits
SUN_POSTN:        45.82d {+03h 03m 18s}  +17.27d {+17d 16' 17"}
SUN_DIST:         88.30 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:       31.01d {+02h 04m 04s}  +13.79d {+13d 47' 28"}
MOON_DIST:        78.55 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:       73.69, -1.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      320.88, 52.34 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 08 May 13 17:37:21 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     555413,   Seg_Num: 0
POINT_RA:        305.338d {+20h 21m 21s} (J2000)
POINT_DEC:       +34.956d {+34d 57' 23"} (J2000)
POINT_ROLL:      69.957d
IMG_START_DATE:  16420 TJD;   128 DOY;   13/05/08
IMG_START_TIME:  62028.52 SOD {17:13:48.52} UT,   295.1 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.405
N_STARS:         167
X_OFFSET:        98 [pixels]
Y_OFFSET:        388 [pixels]
X_MAX:           1537 [pixels]
Y_MAX:           1827 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00555413000msufc0295.fits
SUN_POSTN:        45.82d {+03h 03m 18s}  +17.27d {+17d 16' 17"}
SUN_DIST:         88.30 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:       31.02d {+02h 04m 05s}  +13.79d {+13d 47' 32"}
MOON_DIST:        78.56 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:       73.69, -1.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      320.88, 52.34 [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:     Wed 08 May 13 17:37:32 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     555413,   Seg_Num: 0
GRB_RA:          305.3217d {+20h 21m 17.20s} (J2000),
                 305.4504d {+20h 21m 48.08s} (current),
                 304.8400d {+20h 19m 21.59s} (1950)
GRB_DEC:         +34.9583d {+34d 57' 29.8"} (J2000),
                 +35.0013d {+35d 00' 04.8"} (current),
                 +34.7983d {+34d 47' 53.8"} (1950)
GRB_ERROR:       2.5 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16420 TJD;   128 DOY;   13/05/08
IMG_START_TIME:  61893.00 SOD {17:11:33.00} UT,   159.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        45.82d {+03h 03m 18s}  +17.27d {+17d 16' 18"}
SUN_DIST:         88.31 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:       31.02d {+02h 04m 05s}  +13.79d {+13d 47' 33"}
MOON_DIST:        78.57 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:       73.69, -1.00 [deg] galactic lon,lat of the burst
ECL_COORDS:      320.86, 52.34 [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:     Wed 08 May 13 17:38:15 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     555413,   Seg_Num: 0
POINT_RA:        305.338d {+20h 21m 21s} (J2000)
POINT_DEC:       +34.956d {+34d 57' 23"} (J2000)
ROLL:            69.957d
IMG_START_DATE:  16420 TJD;   128 DOY;   13/05/08
IMG_START_TIME:  62028.52 SOD {17:13:48.52} UT,   295.1 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     389726039
X_OFFSET:        657 [pixels]
Y_OFFSET:        947 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       817
Y_GRB_POS:       1107
BINNING_INDEX:   1
IM_URL:          sw00555413000msuni0306.fits
SUN_POSTN:        45.82d {+03h 03m 18s}  +17.27d {+17d 16' 18"}
SUN_DIST:         88.30 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:       31.03d {+02h 04m 06s}  +13.79d {+13d 47' 39"}
MOON_DIST:        78.56 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:       73.69, -1.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      320.88, 52.34 [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:     Wed 08 May 13 17:38:27 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     555413,   Seg_Num: 0
POINT_RA:        305.338d {+20h 21m 21s} (J2000)
POINT_DEC:       +34.956d {+34d 57' 23"} (J2000)
ROLL:            69.957d
IMG_START_DATE:  16420 TJD;   128 DOY;   13/05/08
IMG_START_TIME:  62028.52 SOD {17:13:48.52} UT,   295.1 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     389726039
X_OFFSET:        657 [pixels]
Y_OFFSET:        947 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       817
Y_GRB_POS:       1107
BINNING_INDEX:   1
IM_URL:          sw00555413000msuni0306.fits
SUN_POSTN:        45.82d {+03h 03m 18s}  +17.27d {+17d 16' 18"}
SUN_DIST:         88.30 [deg]   Sun_angle= 6.7 [hr] (West of Sun)
MOON_POSTN:       31.03d {+02h 04m 07s}  +13.79d {+13d 47' 41"}
MOON_DIST:        78.56 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:       73.69, -1.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      320.88, 52.34 [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 #14607
S. T. Holland (STScI), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), D. N. Burrows (PSU), J. R. Cummings (NASA/UMBC), V. D'Elia (ASDC), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), D. Malesani (DARK/NBI), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), B. Sbarufatti (INAF-OAB/PSU), M. H. Siegel (PSU), E. Troja (NASA/GSFC/UMCP) and B.-B. Zhang (PSU) report on behalf of the Swift Team:
At 17:08:53 UT, the Swift Burst Alert Telescope (BAT) triggered and located a probable GRB 130508A (trigger=555413). Swift slewed immediately to the source location. The BAT on-board calculated location is RA, Dec 305.312, +34.949 which is
```
   RA(J2000)  =  20h 21m 15s
   Dec(J2000) = +34d 56' 58"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The real-time lightcurve shows a weak peak with a duration of about 40 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~18 sec after the trigger.
The XRT began observing the field at 17:11:03.9 UT, 130.5 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 305.3217, 34.9583 which is equivalent to:
```
   RA(J2000)  = 20h 21m 17.20s
   Dec(J2000) = +34d 57' 29.9"
```
with an uncertainty of 2.5 arcseconds (radius, 90% containment). This location is 44 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. We cannot determine whether the source is fading at the present time.
The on-board calculated light curve shows evidence for a strong flare in Windowed Timing mode data at about 145-150 s after the BAT trigger.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (7.72 x 10^21 cm^-2, Kalberla et al. 2005), with an excess column of 1 (+1.60/-1.01) x 10^22 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 135 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 large, but uncertain extinction expected.
Even though this is a weak detection and it is on the Galactic Plane (lon,lat= 74,-1), we determine that this is probably a GRB, but can not rule out some other type of astrophysical source. We will need the full data set to make the determination.
Burst Advocate for this burst is S. T. Holland (sholland AT stsci.edu). 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 #14609
J.C. Tello, R. S=E1nchez-Ramirez, M. Jelinek (IAA-CSIC Granada), J. Gorosabel (UPV/EHU-IAA/CSIC), W. Allen (Vintage Lane Obs.), Ph. Yock (Auckland Univ.), P. Kubanek (IP AS CR & IAA-CSIC), and A. J. Castro-Tirado (IAA-CSIC) report on behalf of a larger collaboration:
"We observed the field of GRB 130508A (Holland et al., GCNC 14607), detected by Swift/BAT, with the 0.6m Yock-Allen robotic telescope (BOOTES-3) located in Blenheim, New Zealand. Unfiltered images were obtained starting 17:10:28UT (94 seconds after the burst, 17.65s after receiving the first GCN packet). The combined exposure of 120 images of 0.5 seconds each revealed no uncatalogued sources within the XRT uncertainty circle down to a magnitude of R Mag~15 when compared to the USNO-B1 catalogue. Further images of longer exposure revealed no other sources and did not provide a significantly better limit."
GCN Circular #14611
D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 130508A (Holland et al., GCNC 14607) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory.
The observation started on 2013-05-08 17:10:40 UT (~1.8 min after the burst). We did not find any new point source within the XRT error circle (Holland et al., GCNC 14607) in all the three bands.
Photometric results of the OT are listed below. We used GSC2.3 catalog for flux calibration.
```
#T0+[day]  MID-UT    T-EXP[sec]   g'     Rc     Ic
-----------------------------------------------------
0.04312    18:10:59    6360.0   >20.5  >20.4  >19.1
-----------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
```
GCN Circular #14612
A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), B.P. Gompertz (U. Leicester), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), A. Maselli (INAF-IASFPA), J.A. Kennea (PSU), M.C. Stroh (PSU), D.N. Burrows (PSU) and S.T. Holland report on behalf of the Swift-XRT team:
We have analysed xx ks of XRT data for GRB 130508A (Holland et al. GCN Circ. 14607), from 0 s to 0 s after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The best available XRT position (using the promptly downlinked event data, the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue) is RA, Dec = 305.3218, 34.9583 which is equivalent to:
```
RA (J2000): 20 21 17.22
Dec(J2000): +34 57 29.9
```
with an uncertainty of 2.5 arcsec (radius, 90% confidence). We cannot determine at the present time whether the source is fading.
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.0 (+0.6, -0.5). The best-fitting absorption column is 1.6 (+1.0, -0.8) x 10^22 cm^-2, in excess of the Galactic value of 7.7 x 10^21 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 1.0 x 10^-10 (1.3 x 10^-10) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.6 (+1.0, -0.8) x 10^22 cm^-2
Galactic foreground: 7.7 x 10^21 cm^-2
Excess significance: 1.7 sigma
Photon index:	     1.0 (+0.6, -0.5)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00555413.
This circular is an official product of the Swift-XRT team.
GCN Circular #14613
T. Sakamoto (AGU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), S. T. Holland (STScI), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC), D. M. Palmer (LANL), 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-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 130508A (trigger #555413) (Holland, et al., GCN Circ. 14607). The BAT ground-calculated position is RA, Dec = 305.351, 34.966 deg which is
```
    RA(J2000)  =  20h 21m 24.2s
    Dec(J2000) = +34d 57' 57.6"
```
with an uncertainty of 2.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 60%.
The mask-weighted light curve shows a single peak from about T+9 to T+55 sec. T90 (15-350 keV) is 42 +- 11 sec (estimated error including systematics).
The time-averaged spectrum from T+9.62 to T+56.75 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.80 +- 0.23. The fluence in the 15-150 keV band is 6.6 +- 1.0 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+11.07 sec in the 15-150 keV band is 0.7 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/555413/BA/
GCN Circular #14614
P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
GCN 14126 was sent in error, with several pieces of information missing, as new data were being processed as the circular was sent.
The corrected refined XRT analysis is as follows:
We have analysed 10 ks of XRT data for GRB 130508A (Holland et al. GCN Circ. 14607), from 134 s to 45.8 ks after the BAT trigger. The data comprise 53 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The best available XRT position (using the promptly downlinked event data, the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue) is RA, Dec = 305.3218, 34.9583 which is equivalent to:
```
RA (J2000): 20 21 17.22
Dec(J2000): +34 57 29.9
```
with an uncertainty of 2.5 arcsec (radius, 90% confidence).
The light curve can be modelled with a power-law decay with a decay index of alpha=1.98 (+0.39, -0.28).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.0 (+0.6, -0.5). The best-fitting absorption column is 1.6 (+1.0, -0.8) x 10^22 cm^-2, in excess of the Galactic value of 7.7 x 10^21 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 1.0 x 10^-10 (1.3 x 10^-10) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:        1.6 (+1.0, -0.8) x 10^22 cm^-2
Galactic foreground: 7.7 x 10^21 cm^-2
Excess significance: 1.7 sigma
Photon index:        1.0 (+0.6, -0.5)
```
If the light curve continues to decay with a power-law decay index of 1.98, the count rate at T+24 hours will be 6.0 x 10^-6 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 6.1 x 10^-16 (7.8 x 10^-16) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00555413.
This circular is an official product of the Swift-XRT team.
GCN Circular #14616
Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), Willia= m H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB) J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UCSC), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC)= , Jos=E9 A. de Diego (UNAM), Leonid Georgiev (UNAM), Jes=FAs Gonz=E1lez (UN= AM), Carlos Rom=E1n-Z=FA=F1iga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley= (GSFC) report:
We observed the field of GRB 130508A (Holland, et al., GCN 14607) 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 2013/05 9.36 to 2013/05 9.45 UTC (15.45 to 17.54 hours after the BAT trigger), obtaining a total of 1.42 hours exposure in the r' and i' bands and 0.60 hours exposure in the Z, Y, J, and H bands.
For a source within the Swift-XRT error circle (Evans et al., GCN 14614), in comparison with USNO-B1 and 2MASS, we obtain the following upper limit= s (3-sigma):
```
  r' > 23.81
  i' > 23.53
  Z  > 21.95
  Y  > 21.66
  J  > 21.00
  H  > 20.42
```
These magnitudes are in the AB system and 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 #14618
Y. Saito, Y. Yano, R. Usui, Y. Tachibana, K. Ito, T. Yoshii, S. Kurita, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 130508A (Holland et al., GCNC 14607) with the optical three color (g, Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan.
The observation started on 2013-05-08 17:10:32 UT ( ~99 sec after the burst). And we could not find any new point source within the XRT error circle (Holland et al., GCNC 14607) in all the three bands.
The results of photometry (3 sigma upper limits) are listed below. We used GSC2.3 catalog for flux calibration.
```
T0+[sec]   MID-UT   T-EXP[sec]    g'           Rc          Ic
------------------------------------------------------------
-------------------------------
    283      17:13:30      240      >19.4   >19.1   >18.0
   2803      17:55:30     4320      >20.7   >20.4   >19.1
------------------------------------------------------------
-------------------------------
T0+ : Elapsed time after the burst [sec]
T-EXP: Total Exposure time [sec]
```
GCN Circular #14619
S. T. Holland (STScI) reports on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 130508A starting 136 s after the BAT trigger (Holland et al. 2013, GCNC 14607). We do not detect any new source consistent with the UVOT-enhanced XRT position (Evans 2013, GCNC 14614) in any of the UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the finding chart (FC) exposures and initial summed exposures are presented below.
```
Filter       TSTART     TSTOP   Exposure      Mag
-------------------------------------------------
white (FC)      136       285        147    >20.8
u (FC)          296       545        246    >19.8
-------------------------------------------------
v              4416      5642        393    >20.0
b               551      6336        288    >20.5
u               296      6257        639    >20.5
uvw1           4417      6052        393    >20.3
uvm2           4212      5847        393    >20.3
uvw2           3801      5437        393    >20.5
white           136      5231        344    >21.5
-------------------------------------------------
```
The quoted upper limits have not been corrected for the expected extinction due to the Galactic reddening along the line of sight to this burst of E(B-V) = 2.54 mag (Schlafly et al. 2011, ApJS, 737, 103).
GCN Circular #14629
K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University
E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina, N.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov, V.V.Chazov, D.Denisenko, A.Sankovich Sternberg Astronomical Institute, Moscow State University
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
V.Krushinski, I.Zalozhnih, A. Popov Ural Federal University, Kourovka
Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA)
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Tunka was pointed to the GRB130508A 37 sec after notice time and 119 sec after GRB time at 2013-05-08 17:10:52.959 UT. On our first (20s exposure) set we haven`t found optical transients within SWIFT error-box (Holland et al. GCN14607). The 5-sigma upper limit has been about 17.3 mag The message may be cited.
GCN Report 426.1
GCN_Report 426.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_426_1.pdf by S.T. Holland at STScI titled: "Swift Observations of GRB 130508A"

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Jochen Greiner, last update: 13-May-2013 [Disclaimer]