Gamma-ray Burst 070520B

(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:     Sun 20 May 07 17:58:29 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     279898,   Seg_Num: 0
GRB_RA:          121.951d {+08h 07m 48s} (J2000),
                 122.101d {+08h 08m 24s} (current),
                 120.935d {+08h 03m 45s} (1950)
GRB_DEC:         +57.617d {+57d 37' 00"} (J2000),
                 +57.595d {+57d 35' 42"} (current),
                 +57.762d {+57d 45' 43"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       14086 [cnts]    Image_Peak=307 [image_cnts]
TRIGGER_DUR:     4.096 [sec] 
TRIGGER_INDEX:   309     E_range: 25-100 keV
BKG_INTEN:       122956 [cnts]
BKG_TIME:        63838.03 SOD {17:43:58.03} UT
BKG_DUR:         40 [sec]
GRB_DATE:        14240 TJD;   140 DOY;   07/05/20
GRB_TIME:        63893.26 SOD {17:44:53.26} UT
GRB_PHI:         -132.98 [deg]
GRB_THETA:        30.68 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.00 [sigma]
IMAGE_SIGNIF:    7.32 [sigma]
MERIT_PARAMS:     +1  +0  +0  +3  +2  +2  +0  +0 -50  +1 
SUN_POSTN:        57.14d {+03h 48m 33s}  +20.01d {+20d 00' 34"}
SUN_DIST:         59.87 [deg]   Sun_angle= -4.3 [hr] (East of Sun)
MOON_POSTN:      114.85d {+07h 39m 24s}  +25.46d {+25d 27' 25"}
MOON_DIST:        32.55 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      159.93, 32.75 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      110.63, 36.44 [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 = 15.89,10.74 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 20 May 07 17:59:12 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     279898,   Seg_Num: 0
GRB_RA:          121.8817d {+08h 07m 31.6s} (J2000),
                 122.0312d {+08h 08m 07.4s} (current),
                 120.8655d {+08h 03m 27.7s} (1950)
GRB_DEC:         +57.6080d {+57d 36' 28.7"} (J2000),
                 +57.5862d {+57d 35' 10.4"} (current),
                 +57.7529d {+57d 45' 10.6"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       67 [cnts]
IMG_START_DATE:  14240 TJD;   140 DOY;   07/05/20
IMG_START_TIME:  63991.32 SOD {17:46:31.32} UT,   98.1 [sec] since BAT Trigger Time
CENTROID_X:      249.02,  raw= 249  [pixels]
CENTROID_Y:      304.71,  raw= 305  [pixels]
ROLL:            259.70 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   15.81
GRB_POS_XRT_Z:   -125.59
IMAGE_URL:       sw00279898000msxps_rw.img
SUN_POSTN:        57.14d {+03h 48m 33s}  +20.01d {+20d 00' 34"}
SUN_DIST:         59.83 [deg]   Sun_angle= -4.3 [hr] (East of Sun)
MOON_POSTN:      114.86d {+07h 39m 25s}  +25.46d {+25d 27' 20"}
MOON_DIST:        32.54 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      159.94, 32.71 [deg] galactic lon,lat of the burst
ECL_COORDS:      110.59, 36.43 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 20 May 07 17:59:02 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     279898,   Seg_Num: 0
GRB_RA:          121.8817d {+08h 07m 31.6s} (J2000),
                 122.0312d {+08h 08m 07.4s} (current),
                 120.8655d {+08h 03m 27.7s} (1950)
GRB_DEC:         +57.6080d {+57d 36' 28.7"} (J2000),
                 +57.5862d {+57d 35' 10.4"} (current),
                 +57.7529d {+57d 45' 10.6"} (1950)
GRB_ERROR:       5.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.51e-09 [erg/cm2/sec]
GRB_SIGNIF:      8.18 [sigma]
IMG_START_DATE:  14240 TJD;   140 DOY;   07/05/20
IMG_START_TIME:  63991.32 SOD {17:46:31.32} UT,   98.1 [sec] since BAT Trigger Time
TAM[0-3]:        327.61 237.18 261.40 243.51
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        57.14d {+03h 48m 33s}  +20.01d {+20d 00' 34"}
SUN_DIST:         59.83 [deg]   Sun_angle= -4.3 [hr] (East of Sun)
MOON_POSTN:      114.85d {+07h 39m 25s}  +25.46d {+25d 27' 21"}
MOON_DIST:        32.54 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      159.94, 32.71 [deg] galactic lon,lat of the burst
ECL_COORDS:      110.59, 36.43 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 20 May 07 17:59:03 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     279898,   Seg_Num: 0
GRB_RA:          121.8817d {+08h 07m 31.6s} (J2000),
                 122.0312d {+08h 08m 07.4s} (current),
                 120.8655d {+08h 03m 27.7s} (1950)
GRB_DEC:         +57.6080d {+57d 36' 28.7"} (J2000),
                 +57.5862d {+57d 35' 10.4"} (current),
                 +57.7529d {+57d 45' 10.6"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       67 [cnts]
IMG_START_DATE:  14240 TJD;   140 DOY;   07/05/20
IMG_START_TIME:  63991.32 SOD {17:46:31.32} UT,   98.1 [sec] since BAT Trigger Time
CENTROID_X:      249.02,  raw= 249  [pixels]
CENTROID_Y:      304.71,  raw= 305  [pixels]
ROLL:            259.70 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   15.81
GRB_POS_XRT_Z:   -125.59
IMAGE_URL:       sw00279898000msxps_rw.img
SUN_POSTN:        57.14d {+03h 48m 33s}  +20.01d {+20d 00' 34"}
SUN_DIST:         59.83 [deg]   Sun_angle= -4.3 [hr] (East of Sun)
MOON_POSTN:      114.85d {+07h 39m 25s}  +25.46d {+25d 27' 21"}
MOON_DIST:        32.54 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      159.94, 32.71 [deg] galactic lon,lat of the burst
ECL_COORDS:      110.59, 36.43 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 20 May 07 18:00:11 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     279898,   Seg_Num: 0
POINT_RA:        121.944d {+08h 07m 46s} (J2000)
POINT_DEC:       +57.618d {+57d 37' 05"} (J2000)
POINT_ROLL:      259.700d
IMG_START_DATE:  14240 TJD;   140 DOY;   07/05/20
IMG_START_TIME:  64000.59 SOD {17:46:40.59} UT,   107.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.982
N_STARS:         61
X_OFFSET:        448 [pixels]
Y_OFFSET:        528 [pixels]
X_MAX:           1407 [pixels]
Y_MAX:           1487 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00279898000msufc0107.fits
SUN_POSTN:        57.14d {+03h 48m 34s}  +20.01d {+20d 00' 34"}
SUN_DIST:         59.86 [deg]   Sun_angle= -4.3 [hr] (East of Sun)
MOON_POSTN:      114.87d {+07h 39m 28s}  +25.45d {+25d 27' 12"}
MOON_DIST:        32.55 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      159.93, 32.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      110.62, 36.44 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 20 May 07 17:59:56 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     279898,   Seg_Num: 0
GRB_RA:          121.951d {+08h 07m 48s} (J2000),
                 122.101d {+08h 08m 24s} (current),
                 120.935d {+08h 03m 45s} (1950)
GRB_DEC:         +57.617d {+57d 37' 00"} (J2000),
                 +57.595d {+57d 35' 42"} (current),
                 +57.762d {+57d 45' 43"} (1950)
GRB_DATE:        14240 TJD;   140 DOY;   07/05/20
GRB_TIME:        63893.26 SOD {17:44:53.26} UT
TRIGGER_INDEX:   309
GRB_PHI:         -132.98 [deg]
GRB_THETA:        30.68 [deg]
DELTA_TIME:      77.00 [sec]
TRIGGER_DUR:     4.096 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.00 [sigma]
IMAGE_SIGNIF:    7.32 [sigma]
LC_URL:          sw00279898000msb.lc
SUN_POSTN:        57.14d {+03h 48m 33s}  +20.01d {+20d 00' 34"}
SUN_DIST:         59.87 [deg]   Sun_angle= -4.3 [hr] (East of Sun)
MOON_POSTN:      114.86d {+07h 39m 27s}  +25.45d {+25d 27' 14"}
MOON_DIST:        32.55 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      159.93, 32.75 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      110.63, 36.44 [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 = 15.89,10.74 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 20 May 07 18:00:39 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     279898,   Seg_Num: 0
POINT_RA:        121.944d {+08h 07m 46s} (J2000)
POINT_DEC:       +57.618d {+57d 37' 05"} (J2000)
POINT_ROLL:      259.700d
IMG_START_DATE:  14240 TJD;   140 DOY;   07/05/20
IMG_START_TIME:  64000.59 SOD {17:46:40.59} UT,   107.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.982
N_STARS:         61
X_OFFSET:        448 [pixels]
Y_OFFSET:        528 [pixels]
X_MAX:           1407 [pixels]
Y_MAX:           1487 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00279898000msufc0107.fits
SUN_POSTN:        57.14d {+03h 48m 34s}  +20.01d {+20d 00' 35"}
SUN_DIST:         59.86 [deg]   Sun_angle= -4.3 [hr] (East of Sun)
MOON_POSTN:      114.87d {+07h 39m 29s}  +25.45d {+25d 27' 09"}
MOON_DIST:        32.55 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      159.93, 32.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      110.62, 36.44 [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 20 May 07 18:01:15 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     279898,   Seg_Num: 0
POINT_RA:        121.944d {+08h 07m 46s} (J2000)
POINT_DEC:       +57.618d {+57d 37' 05"} (J2000)
ROLL:            259.700d
IMG_START_DATE:  14240 TJD;   140 DOY;   07/05/20
IMG_START_TIME:  64000.59 SOD {17:46:40.59} UT,   107.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     201376002
X_OFFSET:        1002 [pixels]
Y_OFFSET:        708 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1162
Y_GRB_POS:       868
BINNING_INDEX:   1
IM_URL:          sw00279898000msuni0107.fits
SUN_POSTN:        57.14d {+03h 48m 34s}  +20.01d {+20d 00' 35"}
SUN_DIST:         59.86 [deg]   Sun_angle= -4.3 [hr] (East of Sun)
MOON_POSTN:      114.88d {+07h 39m 30s}  +25.45d {+25d 27' 04"}
MOON_DIST:        32.56 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      159.93, 32.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      110.62, 36.44 [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:     Sun 20 May 07 18:01:35 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     279898,   Seg_Num: 0
POINT_RA:        121.944d {+08h 07m 46s} (J2000)
POINT_DEC:       +57.618d {+57d 37' 05"} (J2000)
ROLL:            259.700d
IMG_START_DATE:  14240 TJD;   140 DOY;   07/05/20
IMG_START_TIME:  64000.59 SOD {17:46:40.59} UT,   107.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     201376002
X_OFFSET:        1002 [pixels]
Y_OFFSET:        708 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1162
Y_GRB_POS:       868
BINNING_INDEX:   1
IM_URL:          sw00279898000msuni0107.fits
SUN_POSTN:        57.14d {+03h 48m 34s}  +20.01d {+20d 00' 35"}
SUN_DIST:         59.86 [deg]   Sun_angle= -4.3 [hr] (East of Sun)
MOON_POSTN:      114.88d {+07h 39m 31s}  +25.45d {+25d 27' 02"}
MOON_DIST:        32.56 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      159.93, 32.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      110.62, 36.44 [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:     Sun 20 May 07 18:05:19 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     279898,   Seg_Num: 0
POINT_RA:        121.945d {+08h 07m 47s} (J2000)
POINT_DEC:       +57.621d {+57d 37' 15"} (J2000)
POINT_ROLL:      259.702d
IMG_START_DATE:  14240 TJD;   140 DOY;   07/05/20
IMG_START_TIME:  64106.45 SOD {17:48:26.45} UT,   213.2 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.393
N_STARS:         88
X_OFFSET:        682 [pixels]
Y_OFFSET:        388 [pixels]
X_MAX:           1641 [pixels]
Y_MAX:           1347 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00279898000msufc0213.fits
SUN_POSTN:        57.14d {+03h 48m 34s}  +20.01d {+20d 00' 37"}
SUN_DIST:         59.86 [deg]   Sun_angle= -4.3 [hr] (East of Sun)
MOON_POSTN:      114.92d {+07h 39m 40s}  +25.44d {+25d 26' 34"}
MOON_DIST:        32.56 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      159.92, 32.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      110.62, 36.45 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 20 May 07 18:05:46 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     279898,   Seg_Num: 0
POINT_RA:        121.945d {+08h 07m 47s} (J2000)
POINT_DEC:       +57.621d {+57d 37' 15"} (J2000)
POINT_ROLL:      259.702d
IMG_START_DATE:  14240 TJD;   140 DOY;   07/05/20
IMG_START_TIME:  64106.45 SOD {17:48:26.45} UT,   213.2 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.393
N_STARS:         88
X_OFFSET:        682 [pixels]
Y_OFFSET:        388 [pixels]
X_MAX:           1641 [pixels]
Y_MAX:           1347 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00279898000msufc0213.fits
SUN_POSTN:        57.14d {+03h 48m 34s}  +20.01d {+20d 00' 37"}
SUN_DIST:         59.86 [deg]   Sun_angle= -4.3 [hr] (East of Sun)
MOON_POSTN:      114.92d {+07h 39m 41s}  +25.44d {+25d 26' 31"}
MOON_DIST:        32.56 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      159.92, 32.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      110.62, 36.45 [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 20 May 07 18:06:29 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     279898,   Seg_Num: 0
POINT_RA:        121.945d {+08h 07m 47s} (J2000)
POINT_DEC:       +57.621d {+57d 37' 15"} (J2000)
ROLL:            259.702d
IMG_START_DATE:  14240 TJD;   140 DOY;   07/05/20
IMG_START_TIME:  64106.45 SOD {17:48:26.45} UT,   213.2 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     201376108
X_OFFSET:        1002 [pixels]
Y_OFFSET:        708 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1162
Y_GRB_POS:       868
BINNING_INDEX:   1
IM_URL:          sw00279898000msuni0213.fits
SUN_POSTN:        57.14d {+03h 48m 35s}  +20.01d {+20d 00' 38"}
SUN_DIST:         59.86 [deg]   Sun_angle= -4.3 [hr] (East of Sun)
MOON_POSTN:      114.93d {+07h 39m 43s}  +25.44d {+25d 26' 25"}
MOON_DIST:        32.56 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      159.92, 32.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      110.62, 36.45 [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:     Sun 20 May 07 18:06:50 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     279898,   Seg_Num: 0
POINT_RA:        121.945d {+08h 07m 47s} (J2000)
POINT_DEC:       +57.621d {+57d 37' 15"} (J2000)
ROLL:            259.702d
IMG_START_DATE:  14240 TJD;   140 DOY;   07/05/20
IMG_START_TIME:  64106.45 SOD {17:48:26.45} UT,   213.2 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     201376108
X_OFFSET:        1002 [pixels]
Y_OFFSET:        708 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1162
Y_GRB_POS:       868
BINNING_INDEX:   1
IM_URL:          sw00279898000msuni0213.fits
SUN_POSTN:        57.14d {+03h 48m 35s}  +20.01d {+20d 00' 38"}
SUN_DIST:         59.86 [deg]   Sun_angle= -4.3 [hr] (East of Sun)
MOON_POSTN:      114.93d {+07h 39m 44s}  +25.44d {+25d 26' 23"}
MOON_DIST:        32.56 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      159.92, 32.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      110.62, 36.45 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #6425
A. Moretti (INAF-OAB), S. D. Barthelmy (GSFC), M. M. Chester (PSU), N. Gehrels (NASA/GSFC), C. Gronwall (PSU), J. A. Kennea (PSU), V. Mangano (INAF-IASFPA), P. T. O'Brien (U Leicester), D. M. Palmer (LANL), P. Romano (Univ. Bicocca & INAF-OAB), M. Stamatikos (NASA/ORAU), E. Troja (INAF-IASFPA) and S. D. Vergani (DIAS-DCU) report on behalf of the Swift Team:
At 17:44:53 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 070520B (trigger=279898). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 121.951, +57.617 which is
```
   RA(J2000)  =  08h 07m 48s
   Dec(J2000) = +57d 37' 00"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single peak with a duration of about 5 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~0 sec after the trigger. This burst occurred during a Malindi data downlink session which buffered the initial notices for up to 12 minutes.
The XRT began observing the field at 17:46:31 UT, 98 seconds after the BAT trigger. Using prompt downlinked data XRT found a bright and flaring uncatalogued X-ray source located at RA, Dec 121.8798, 57.6092 which is
```
   RA(J2000)  = 08h 07m 31.1's
   Dec(J2000) = +57d 36' 33.1''
```
with an uncertainty of 4.3 arcsec (radius, 90% containment). This location is 138 arcseconds from the BAT on-board position, within the BAT error circle. The initial flux in the 2.5s image was 1.5e-09 erg/cm2/s (0.2-10 keV).
UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 107 seconds after the BAT trigger. No 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 3-sigma upper limit at the XRT position is 19.5 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 Galactic reddening of E(B-V)=0.04.
GCN Circular #6429
T. Sakamoto (GSFC/ORAU), L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), A. Moretti (INAF-OAB), D. Palmer (LANL), A. Parsons (GSFC), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC) on behalf of the Swift-BAT team:
Using the data set from T-239 to T+592 sec from recent telemetry downlinks, we report further analysis of BAT GRB 070520B (trigger #279898) (Moretti, et al., GCN Circ. 6245). The BAT ground-calculated position is RA, Dec = 121.886, 57.588 deg which is
```
   RA(J2000)  = 08h 07m 32.7s 
   Dec(J2000) = 57d 35' 15.3" 
```
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 59%.
The mask-weighted light curve shows two overlapping peaks starting at T-4 sec, peaking at T+1 sec, and ending with a long tail at T+200 sec. T90 (15-350 keV) is 66 +- 4 sec (estimated error including systematics).
The time-averaged spectrum from T-5.0 to T+71.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.15 +- 0.21. The fluence in the 15-150 keV band is 9.2 +- 1.1 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.74 sec in the 15-150 keV band is 0.4 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
GCN Circular #6438
A. Moretti (INAF-OAB), P. Romano (Univ Bicocca&INAF-OAB), C. Guidorzi (Univ Bicocca&INAF-OAB), S.D. Vergani (DIAS-DCU) report on behalf of the Swift team:
We have analysed the first three orbits of XRT data on GRB 070520B (Moretti et al., GCN Circ. 6425) with total observing times of 284 s in Windowed Timing mode (from T+104 to T+388 s) and 5.2 ks in Photon Counting mode (from T+388 s). The Photon Counting mode image provides a refined XRT position at RA,DEC(J2000) = 121.87964,+57.60896, which is
```
RA(J2000)  = 08h 07m 31.11s   
Dec(J2000) =+57d 36' 32.3"
```
with an uncertainty of 4.0 arcsec (radius, 90% containment). This is 1.0 arcsec from the initial X-ray position, and 76 arcsec from the refine BAT position (Sakamoto et al., GCN Circ. 6429).
The XRT light curve (LC) exhibits an initial mildly steep decay (slope 2.5) in the interval (100,170) seconds from the trigger. An intense FRED-like flare is present between 170 and 390 seconds. In the second and third orbits the LC shows a decay with a slope is 1.0+/-0.3.
The first WT spectrum, extracted before the flare, can be fit with an absorbed power law with a photon index of 2.5+/-0.2 and a column density of (2.1+/-0.4)E21 cm^-2 significantly in excess of the Galactic value (4.22E20 cm^-2; Dickey & Lockman, 1990). The mean WT spectrum, extracted during the flare, can be fit with an absorbed power law with a photon index of 2.6+/-0.1 and a column density of (2.5+/-0.2)E21 cm^-2 again significantly in excess of the Galactic value. The absorbed (unabsorbed) 0.3-10.0keV mean flare flux is 9.4E-10 (2.1E-9) ergs cm^-2 s^-1. Errors are quoted at 90% confidence level.
Assuming the source continues to decay at the present rate, we predict an XRT count rate of 1E-3 counts/s at T+24 hours, which corresponds to an unabsorbed flux of 5E-14 ergs cm^-2 s^-1.
This circular is an official product of the Swift XRT team.
GCN Report 59.1
GCN_Report 59.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_59_1.pdf by A. Moretti at INAF-OAB titled: "Swift observations of GRB 070520B"
GCN Circular #6442
F.E. Marshall (NASA/GSFC) and A. Moretti (INAF-OAB) report on behalf of the Swift/UVOT team:
The Swift/UVOT observed the field of GRB 070520B starting 107 s after the BAT trigger (Moretti et al., GCN Circ. 6425). We do not find any source in any of the UVOT observations inside the refined XRT error circle (Moretti et al., GCN Circ. 6438). The 3-sigma upper limits for detecting a source inside the XRT error circle in the first finding chart (FC) exposure and co-added frames are:
```
Filter            T_start(s)   T_stop(s)     Exp(s)     Mag (3-sigma UL)

White (FC)        107          207           98         >20.3
White             107          6197          491        >21.0
V                 213          11338         1356       >20.1
B                 4360         5992          393        >20.3
U                 4155         5788          393        >20.0
UVW1              3950         5583          393        >19.9
UWM2              3745         12043         1094       >20.5
UVW2              4769         10411         1152       >20.9
```
The values quoted above are not corrected for the expected Galactic extinction corresponding to a reddening of E(B-V) = 0.04 mag towards the direction of the burst (Schlegel et al. 1998).
GCN Circular #6447
A. C. Updike, J. R. Puls, and D. H. Hartmann (Clemson University) report on behalf of the Clemson GRB Follow-Up Team:
We used the 0.9m SARA telescope on Kitt Peak to image the field of GRB 070520B (GCN 6425, Moretti et al.) under decent weather conditions beginning 9.5 hours after the burst trigger (279898). In 52 minutes of stacked R-band exposures, we detect no new sources down to a limiting magnitude of 20.2 +/- 0.4 based on calibration to 8 USNO B1.0 stars.
The SARA Homepage can be found at: http://saraobservatory.org
This message may be cited.
GCN Circular #6455
T. Minezaki (IoA, Tokyo) and P.A. Price (IfA, Hawaii) report on behalf of a larger collaboration:
We observed the position of GRB 070520B with the MAGNUM telescope + MIPS dual-beam imager in R and J bands, at a mean observation time of 12.69 hours after the BAT trigger (GCN #6425). We have only inspected the J-band images, since other reports have covered the optical (GCN ##6442,6447). We find no afterglow within the XRT error circle to a limit of J = 20.1 mag.
This message may be cited.
GCN Circular #6485
D. Shakhovskoy, V. Rumyantsev (CrAO), V. Biryukov (CrAO, SAI MSU), A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration report:
We observed error box of GRB070520B (Moretti et al., GCN 6425) with AZT-11 (1.25m) telescope of CrAO in R-band under not optimal weather conditions (seeing ~3.6 arcsec) on May 20 between (UT)18:47 and 19:21, i.e. starting 1 hour after burst onset. The weather condition No object is found in a refined XRT error box (Moretti et al., GCN 6438 ). Limiting magnitude of a combined image is based on USANO A2.0:
```
Mid time (UT),  Exposure,    R_Lim (3sigma)
May 20.753      6x300        21.0
```
The combined image can be found in http://grb.rssi.ru/GRB070520B/GRB070520B_AZT11.gif
This message may be cited.

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Jochen Greiner, last update: 02-Jun-2007 [Disclaimer]