Gamma-ray Burst 090530

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 30 May 09 03:18:29 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     353567,   Seg_Num: 0
GRB_RA:          179.395d {+11h 57m 35s} (J2000),
                 179.516d {+11h 58m 04s} (current),
                 178.752d {+11h 55m 00s} (1950)
GRB_DEC:         +26.584d {+26d 35' 01"} (J2000),
                 +26.531d {+26d 31' 52"} (current),
                 +26.862d {+26d 51' 43"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       1687 [cnts]    Image_Peak=132 [image_cnts]
TRIGGER_DUR:     0.256 [sec] 
TRIGGER_INDEX:   37     E_range: 25-100 keV
BKG_INTEN:       32562 [cnts]
BKG_TIME:        11883.21 SOD {03:18:03.21} UT
BKG_DUR:         8 [sec]
GRB_DATE:        14981 TJD;   150 DOY;   09/05/30
GRB_TIME:        11898.38 SOD {03:18:18.38} UT
GRB_PHI:         -52.46 [deg]
GRB_THETA:        35.33 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     23.34 [sigma]
IMAGE_SIGNIF:    9.41 [sigma]
MERIT_PARAMS:     +1  +0  +0  -2  +2  +0  +0  +0 +15  +0 
SUN_POSTN:        67.15d {+04h 28m 36s}  +21.78d {+21d 46' 35"}
SUN_DIST:         98.65 [deg]   Sun_angle= -7.5 [hr] (East of Sun)
MOON_POSTN:      147.52d {+09h 50m 05s}  +10.98d {+10d 58' 46"}
MOON_DIST:        33.90 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      212.46, 77.98 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      168.21, 24.01 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 229.10,-7.89 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 30 May 09 03:19:59 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     353567,   Seg_Num: 0
GRB_RA:          179.4196d {+11h 57m 40.70s} (J2000),
                 179.5404d {+11h 58m 09.69s} (current),
                 178.7769d {+11h 55m 06.44s} (1950)
GRB_DEC:         +26.5926d {+26d 35' 33.3"} (J2000),
                 +26.5402d {+26d 32' 24.7"} (current),
                 +26.8710d {+26d 52' 15.4"} (1950)
GRB_ERROR:       6.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       6.42e-10 [erg/cm2/sec]
GRB_SIGNIF:      5.91 [sigma]
IMG_START_DATE:  14981 TJD;   150 DOY;   09/05/30
IMG_START_TIME:  11973.10 SOD {03:19:33.10} UT,   74.7 [sec] since BAT Trigger Time
TAM[0-3]:        327.67 237.23 261.47 243.64
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        67.15d {+04h 28m 36s}  +21.78d {+21d 46' 36"}
SUN_DIST:         98.67 [deg]   Sun_angle= -7.5 [hr] (East of Sun)
MOON_POSTN:      147.54d {+09h 50m 08s}  +10.97d {+10d 58' 24"}
MOON_DIST:        33.92 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      212.43, 78.00 [deg] galactic lon,lat of the burst
ECL_COORDS:      168.23, 24.02 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.44 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 30 May 09 03:20:10 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     353567,   Seg_Num: 0
GRB_RA:          179.4196d {+11h 57m 40.7s} (J2000),
                 179.5404d {+11h 58m 09.6s} (current),
                 178.7769d {+11h 55m 06.4s} (1950)
GRB_DEC:         +26.5926d {+26d 35' 33.3"} (J2000),
                 +26.5402d {+26d 32' 24.7"} (current),
                 +26.8710d {+26d 52' 15.4"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       35 [cnts]
IMG_START_DATE:  14981 TJD;   150 DOY;   09/05/30
IMG_START_TIME:  11973.10 SOD {03:19:33.10} UT,   74.7 [sec] since BAT Trigger Time
CENTROID_X:      295.92,  raw= 296  [pixels]
CENTROID_Y:      273.72,  raw= 274  [pixels]
ROLL:            299.65 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -57.22
GRB_POS_XRT_Z:   -15.02
IMAGE_URL:       sw00353567000msxps_rw.img
SUN_POSTN:        67.15d {+04h 28m 36s}  +21.78d {+21d 46' 36"}
SUN_DIST:         98.67 [deg]   Sun_angle= -7.5 [hr] (East of Sun)
MOON_POSTN:      147.54d {+09h 50m 09s}  +10.97d {+10d 58' 21"}
MOON_DIST:        33.92 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      212.43, 78.00 [deg] galactic lon,lat of the burst
ECL_COORDS:      168.23, 24.02 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 30 May 09 03:20:15 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     353567,   Seg_Num: 0
GRB_RA:          179.4196d {+11h 57m 40.7s} (J2000),
                 179.5404d {+11h 58m 09.6s} (current),
                 178.7769d {+11h 55m 06.4s} (1950)
GRB_DEC:         +26.5926d {+26d 35' 33.3"} (J2000),
                 +26.5402d {+26d 32' 24.7"} (current),
                 +26.8710d {+26d 52' 15.4"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       35 [cnts]
IMG_START_DATE:  14981 TJD;   150 DOY;   09/05/30
IMG_START_TIME:  11973.10 SOD {03:19:33.10} UT,   74.7 [sec] since BAT Trigger Time
CENTROID_X:      295.92,  raw= 296  [pixels]
CENTROID_Y:      273.72,  raw= 274  [pixels]
ROLL:            299.65 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -57.22
GRB_POS_XRT_Z:   -15.02
IMAGE_URL:       sw00353567000msxps_rw.img
SUN_POSTN:        67.15d {+04h 28m 36s}  +21.78d {+21d 46' 36"}
SUN_DIST:         98.67 [deg]   Sun_angle= -7.5 [hr] (East of Sun)
MOON_POSTN:      147.54d {+09h 50m 09s}  +10.97d {+10d 58' 20"}
MOON_DIST:        33.92 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      212.43, 78.00 [deg] galactic lon,lat of the burst
ECL_COORDS:      168.23, 24.02 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 30 May 09 03:22:03 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     353567,   Seg_Num: 0
GRB_RA:          179.395d {+11h 57m 35s} (J2000),
                 179.516d {+11h 58m 04s} (current),
                 178.752d {+11h 55m 00s} (1950)
GRB_DEC:         +26.584d {+26d 35' 01"} (J2000),
                 +26.531d {+26d 31' 52"} (current),
                 +26.862d {+26d 51' 43"} (1950)
GRB_DATE:        14981 TJD;   150 DOY;   09/05/30
GRB_TIME:        11898.38 SOD {03:18:18.38} UT
TRIGGER_INDEX:   37
GRB_PHI:         -52.46 [deg]
GRB_THETA:        35.33 [deg]
DELTA_TIME:      -76.00 [sec]
TRIGGER_DUR:     0.256 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     23.34 [sigma]
IMAGE_SIGNIF:    9.41 [sigma]
LC_URL:          sw00353567000msb.lc
SUN_POSTN:        67.15d {+04h 28m 37s}  +21.78d {+21d 46' 36"}
SUN_DIST:         98.65 [deg]   Sun_angle= -7.5 [hr] (East of Sun)
MOON_POSTN:      147.55d {+09h 50m 13s}  +10.96d {+10d 57' 54"}
MOON_DIST:        33.88 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      212.46, 77.98 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      168.21, 24.01 [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 = 229.10,-7.89 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 30 May 09 03:22:47 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     353567,   Seg_Num: 0
POINT_RA:        179.414d {+11h 57m 39s} (J2000)
POINT_DEC:       +26.577d {+26d 34' 37"} (J2000)
POINT_ROLL:      299.655d
IMG_START_DATE:  14981 TJD;   150 DOY;   09/05/30
IMG_START_TIME:  11981.90 SOD {03:19:41.90} UT,   83.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.280
N_STARS:         18
X_OFFSET:        600 [pixels]
Y_OFFSET:        472 [pixels]
X_MAX:           1559 [pixels]
Y_MAX:           1431 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00353567000msufc0083.fits
SUN_POSTN:        67.15d {+04h 28m 37s}  +21.78d {+21d 46' 37"}
SUN_DIST:         98.67 [deg]   Sun_angle= -7.5 [hr] (East of Sun)
MOON_POSTN:      147.56d {+09h 50m 15s}  +10.96d {+10d 57' 43"}
MOON_DIST:        33.89 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      212.50, 78.00 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      168.23, 24.01 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 30 May 09 03:23:19 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     353567,   Seg_Num: 0
POINT_RA:        179.414d {+11h 57m 39s} (J2000)
POINT_DEC:       +26.577d {+26d 34' 37"} (J2000)
POINT_ROLL:      299.655d
IMG_START_DATE:  14981 TJD;   150 DOY;   09/05/30
IMG_START_TIME:  11981.90 SOD {03:19:41.90} UT,   83.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.280
N_STARS:         18
X_OFFSET:        600 [pixels]
Y_OFFSET:        472 [pixels]
X_MAX:           1559 [pixels]
Y_MAX:           1431 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00353567000msufc0083.fits
SUN_POSTN:        67.15d {+04h 28m 37s}  +21.78d {+21d 46' 37"}
SUN_DIST:         98.67 [deg]   Sun_angle= -7.5 [hr] (East of Sun)
MOON_POSTN:      147.57d {+09h 50m 16s}  +10.96d {+10d 57' 35"}
MOON_DIST:        33.89 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      212.50, 78.00 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      168.23, 24.01 [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:     Sat 30 May 09 03:22:47 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     353567,   Seg_Num: 0
POINT_RA:        179.414d {+11h 57m 39s} (J2000)
POINT_DEC:       +26.577d {+26d 34' 37"} (J2000)
POINT_ROLL:      299.655d
IMG_START_DATE:  14981 TJD;   150 DOY;   09/05/30
IMG_START_TIME:  11981.90 SOD {03:19:41.90} UT,   83.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.280
N_STARS:         18
X_OFFSET:        600 [pixels]
Y_OFFSET:        472 [pixels]
X_MAX:           1559 [pixels]
Y_MAX:           1431 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00353567000msufc0083.fits
SUN_POSTN:        67.15d {+04h 28m 37s}  +21.78d {+21d 46' 37"}
SUN_DIST:         98.67 [deg]   Sun_angle= -7.5 [hr] (East of Sun)
MOON_POSTN:      147.56d {+09h 50m 15s}  +10.96d {+10d 57' 43"}
MOON_DIST:        33.89 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      212.50, 78.00 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      168.23, 24.01 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 30 May 09 03:24:10 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     353567,   Seg_Num: 0
POINT_RA:        179.414d {+11h 57m 39s} (J2000)
POINT_DEC:       +26.577d {+26d 34' 37"} (J2000)
ROLL:            299.655d
IMG_START_DATE:  14981 TJD;   150 DOY;   09/05/30
IMG_START_TIME:  11981.90 SOD {03:19:41.90} UT,   83.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     265346386
X_OFFSET:        894 [pixels]
Y_OFFSET:        958 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1054
Y_GRB_POS:       1118
BINNING_INDEX:   1
IM_URL:          sw00353567000msuni0088.fits
SUN_POSTN:        67.15d {+04h 28m 37s}  +21.78d {+21d 46' 37"}
SUN_DIST:         98.67 [deg]   Sun_angle= -7.5 [hr] (East of Sun)
MOON_POSTN:      147.57d {+09h 50m 18s}  +10.96d {+10d 57' 23"}
MOON_DIST:        33.89 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      212.50, 78.00 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      168.23, 24.01 [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:     Sat 30 May 09 03:24:36 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     353567,   Seg_Num: 0
POINT_RA:        179.414d {+11h 57m 39s} (J2000)
POINT_DEC:       +26.577d {+26d 34' 37"} (J2000)
ROLL:            299.655d
IMG_START_DATE:  14981 TJD;   150 DOY;   09/05/30
IMG_START_TIME:  11981.90 SOD {03:19:41.90} UT,   83.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     265346386
X_OFFSET:        894 [pixels]
Y_OFFSET:        958 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1054
Y_GRB_POS:       1118
BINNING_INDEX:   1
IM_URL:          sw00353567000msuni0088.fits
SUN_POSTN:        67.15d {+04h 28m 37s}  +21.78d {+21d 46' 37"}
SUN_DIST:         98.67 [deg]   Sun_angle= -7.5 [hr] (East of Sun)
MOON_POSTN:      147.58d {+09h 50m 18s}  +10.95d {+10d 57' 17"}
MOON_DIST:        33.88 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      212.50, 78.00 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      168.23, 24.01 [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:     Sat 30 May 09 03:30:15 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     353567,   Seg_Num: 0
GRB_RA:          179.4188d {+11h 57m 40.51s} (J2000),
                 179.5396d {+11h 58m 09.50s} (current),
                 178.7761d {+11h 55m 06.25s} (1950)
GRB_DEC:         +26.5940d {+26d 35' 38.4"} (J2000),
                 +26.5416d {+26d 32' 29.8"} (current),
                 +26.8724d {+26d 52' 20.5"} (1950)
GRB_ERROR:       0.8 [arcsec radius, statistical only]
GRB_MAG:         17.38 +/- 0.14 [mag]
FILTER:          10, White
IMG_START_DATE:  14981 TJD;   150 DOY;   09/05/30
IMG_START_TIME:  11984.00 SOD {03:19:44.00} UT,   85.6 [sec] since BAT Trigger Time
SUN_POSTN:        67.16d {+04h 28m 38s}  +21.78d {+21d 46' 39"}
SUN_DIST:         98.66 [deg]   Sun_angle= -7.5 [hr] (East of Sun)
MOON_POSTN:      147.63d {+09h 50m 31s}  +10.93d {+10d 55' 54"}
MOON_DIST:        33.86 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      212.42, 78.00 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      168.22, 24.02 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The UVOT position is 5.4 arcsec from the XRT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 30 May 09 03:30:58 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     353567,   Seg_Num: 0
POINT_RA:        179.417d {+11h 57m 40s} (J2000)
POINT_DEC:       +26.575d {+26d 34' 30"} (J2000)
POINT_ROLL:      299.656d
IMG_START_DATE:  14981 TJD;   150 DOY;   09/05/30
IMG_START_TIME:  12193.79 SOD {03:23:13.79} UT,   295.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.580
N_STARS:         6
X_OFFSET:        574 [pixels]
Y_OFFSET:        638 [pixels]
X_MAX:           1533 [pixels]
Y_MAX:           1597 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00353567000msufc0295.fits
SUN_POSTN:        67.16d {+04h 28m 38s}  +21.78d {+21d 46' 40"}
SUN_DIST:         98.67 [deg]   Sun_angle= -7.5 [hr] (East of Sun)
MOON_POSTN:      147.63d {+09h 50m 32s}  +10.93d {+10d 55' 44"}
MOON_DIST:        33.85 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      212.51, 78.00 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      168.23, 24.01 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 30 May 09 03:31:26 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     353567,   Seg_Num: 0
POINT_RA:        179.417d {+11h 57m 40s} (J2000)
POINT_DEC:       +26.575d {+26d 34' 30"} (J2000)
POINT_ROLL:      299.656d
IMG_START_DATE:  14981 TJD;   150 DOY;   09/05/30
IMG_START_TIME:  12193.79 SOD {03:23:13.79} UT,   295.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.580
N_STARS:         6
X_OFFSET:        574 [pixels]
Y_OFFSET:        638 [pixels]
X_MAX:           1533 [pixels]
Y_MAX:           1597 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00353567000msufc0295.fits
SUN_POSTN:        67.16d {+04h 28m 38s}  +21.78d {+21d 46' 40"}
SUN_DIST:         98.67 [deg]   Sun_angle= -7.5 [hr] (East of Sun)
MOON_POSTN:      147.64d {+09h 50m 33s}  +10.93d {+10d 55' 37"}
MOON_DIST:        33.85 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      212.51, 78.00 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      168.23, 24.01 [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:     Sat 30 May 09 03:31:44 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     353567,   Seg_Num: 0
GRB_RA:          179.4189d {+11h 57m 40.53s} (J2000),
                 179.5397d {+11h 58m 09.52s} (current),
                 178.7762d {+11h 55m 06.28s} (1950)
GRB_DEC:         +26.5940d {+26d 35' 38.4"} (J2000),
                 +26.5416d {+26d 32' 29.8"} (current),
                 +26.8724d {+26d 52' 20.5"} (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:  14981 TJD;   150 DOY;   09/05/30
IMG_START_TIME:  12006.00 SOD {03:20:06.00} UT,   107.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        67.16d {+04h 28m 38s}  +21.78d {+21d 46' 40"}
SUN_DIST:         98.66 [deg]   Sun_angle= -7.5 [hr] (East of Sun)
MOON_POSTN:      147.64d {+09h 50m 34s}  +10.93d {+10d 55' 33"}
MOON_DIST:        33.86 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      212.42, 78.00 [deg] galactic lon,lat of the burst
ECL_COORDS:      168.22, 24.02 [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

GCN NOTICE

IMBAD search for XRT_RA,Dec=179.4189,26.5940,radius=1.0arcmin

Num   RA         Dec                    Name                    Type   Num_Pub  Distance


NED search for XRT_RA,Dec=179.4189,26.5940,radius=1.0arcmin

Num    RA           Dec       Name                           Type      Distance

 1   179.420970    26.594474  SDSS J115741.03+263540.1      , *        0.10
 2   179.422947    26.592326  SDSS J115741.50+263532.3      , G        0.20
 3   179.423610    26.595173  SDSS J115741.66+263542.6      , *        0.30
 4   179.420447    26.598662  SDSS J115740.90+263555.1      , *        0.30
 5   179.411446    26.596391  SDSS J115738.74+263547.0      , G        0.40
 6   179.417193    26.586573  SDSS J115740.12+263511.6      , *        0.50
 7   179.414360    26.600465  SDSS J115739.44+263601.6      , G        0.50
 8   179.427272    26.600846  SDSS J115742.54+263603.0      , G        0.60
 9   179.429922    26.597147  SDSS J115743.18+263549.7      , *        0.60
10   179.410863    26.601698  SDSS J115738.60+263606.1      , G        0.60
11   179.407827    26.589097  SDSS J115737.87+263520.7      , G        0.70
12   179.417060    26.583016  SDSS J115740.09+263458.8      , G        0.70
13   179.427818    26.585952  SDSS J115742.67+263509.4      , G        0.70
14   179.414554    26.604919  SDSS J115739.49+263617.7      , G        0.70
15   179.405832    26.588950  SDSS J115737.39+263520.2      , G        0.80
16   179.428369    26.604197  SDSS J115742.80+263615.1      , *        0.80
17   179.425524    26.606487  SDSS J115742.12+263623.3      , *        0.80
18   179.414647    26.580077  SDSS J115739.51+263448.2      , *        0.90
19   179.433320    26.586267  SDSS J115743.99+263510.5      , G        0.90
20   179.436028    26.588465  SDSS J115744.64+263518.4      , G        1.00
21   179.400286    26.594372  SDSS J115736.06+263539.7      , *        1.00

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 30 May 09 03:30:58 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     353567,   Seg_Num: 0
POINT_RA:        179.417d {+11h 57m 40s} (J2000)
POINT_DEC:       +26.575d {+26d 34' 30"} (J2000)
POINT_ROLL:      299.656d
IMG_START_DATE:  14981 TJD;   150 DOY;   09/05/30
IMG_START_TIME:  12193.79 SOD {03:23:13.79} UT,   295.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.580
N_STARS:         6
X_OFFSET:        574 [pixels]
Y_OFFSET:        638 [pixels]
X_MAX:           1533 [pixels]
Y_MAX:           1597 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00353567000msufc0295.fits
SUN_POSTN:        67.16d {+04h 28m 38s}  +21.78d {+21d 46' 40"}
SUN_DIST:         98.67 [deg]   Sun_angle= -7.5 [hr] (East of Sun)
MOON_POSTN:      147.63d {+09h 50m 32s}  +10.93d {+10d 55' 44"}
MOON_DIST:        33.85 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      212.51, 78.00 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      168.23, 24.01 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN Circular #9438
J. K. Cannizzo (NASA/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (NASA/UMBC), C. Gronwall (PSU), S. T. Holland (CRESST/USRA/GSFC), V. Mangano (INAF-IASFPA), C. B. Markwardt (CRESST/GSFC/UMD), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), T. Sakamoto (NASA/UMBC), B. Sbarufatti (INAF-IASFPA), M. H. Siegel (PSU), M. Stamatikos (NASA/ORAU) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team:
At 03:18:18 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 090530 (trigger=353567). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 179.395, +26.584 which is
```
   RA(J2000) = 11h 57m 35s
   Dec(J2000) = +26d 35' 01"
```
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 10 sec. The peak count rate was ~5000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 03:19:33.1 UT, 74.7 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source located at RA, Dec 179.41927, 26.59282 which is equivalent to:
```
   RA(J2000)  = 11h 57m 40.62s
   Dec(J2000) = +26d 35' 34.2"
```
with an uncertainty of 3.9 arcseconds (radius, 90% containment). This location is 84 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 (1.78e+20 cm^-2, Kalberla et al. 2005), with an excess column of 2.1 (+2.01/-1.71) x 10^21 cm^-2 (90% confidence).
The initial flux in the 2.5 s image was 6.42e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 83 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	11:57:40.50 = 179.41876
  DEC(J2000) = +26:35:38.6  = 26.59405
```
with a 90%-confidence error radius of about 0.75 arc sec. This position is 4.7 arc sec. from the center of the XRT error circle. The estimated magnitude is 17.39 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.02.
Burst Advocate for this burst is J. K. Cannizzo (cannizzo AT milkyway.gsfc.nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 30 May 09 03:32:20 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     353567,   Seg_Num: 0
POINT_RA:        179.417d {+11h 57m 40s} (J2000)
POINT_DEC:       +26.575d {+26d 34' 30"} (J2000)
ROLL:            299.656d
IMG_START_DATE:  14981 TJD;   150 DOY;   09/05/30
IMG_START_TIME:  12193.79 SOD {03:23:13.79} UT,   295.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     265346598
X_OFFSET:        894 [pixels]
Y_OFFSET:        958 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1054
Y_GRB_POS:       1118
BINNING_INDEX:   1
IM_URL:          sw00353567000msuni0300.fits
SUN_POSTN:        67.16d {+04h 28m 38s}  +21.78d {+21d 46' 40"}
SUN_DIST:         98.67 [deg]   Sun_angle= -7.5 [hr] (East of Sun)
MOON_POSTN:      147.65d {+09h 50m 35s}  +10.92d {+10d 55' 24"}
MOON_DIST:        33.84 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      212.51, 78.00 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      168.23, 24.01 [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:     Sat 30 May 09 03:32:49 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     353567,   Seg_Num: 0
POINT_RA:        179.417d {+11h 57m 40s} (J2000)
POINT_DEC:       +26.575d {+26d 34' 30"} (J2000)
ROLL:            299.656d
IMG_START_DATE:  14981 TJD;   150 DOY;   09/05/30
IMG_START_TIME:  12193.79 SOD {03:23:13.79} UT,   295.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     265346598
X_OFFSET:        894 [pixels]
Y_OFFSET:        958 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1054
Y_GRB_POS:       1118
BINNING_INDEX:   1
IM_URL:          sw00353567000msuni0300.fits
SUN_POSTN:        67.16d {+04h 28m 38s}  +21.78d {+21d 46' 40"}
SUN_DIST:         98.66 [deg]   Sun_angle= -7.5 [hr] (East of Sun)
MOON_POSTN:      147.65d {+09h 50m 36s}  +10.92d {+10d 55' 17"}
MOON_DIST:        33.84 [deg]
MOON_ILLUM:      39 [%]
GAL_COORDS:      212.51, 78.00 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      168.23, 24.01 [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 #9439
H. Flewelling (IfA), B. E. Schaefer (Louisiana State), Shashi Pandey (UMich) report on behalf of the ROTSE collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB 090530A (Swift trigger 353567). The first image was at 03:18:35.8 UT, 17.4 s after the burst (6.8 s after the GCN notice time). The unfiltered images are calibrated relative to USNO A2.0. We detect a new object, not visible in the DSS (second epoch), with coordinates:
11:57:40.5 +26:35:37.9 (J2000), with positional uncertainty of 1" or better
```
start UT    	mag     mlim(of image)
----------------------------------
03:18:42.7     16.0     16.2
```
A jpeg image is available at http://www.rotse.net/images/gsb353567_3b00_img.jpg Note that the object marked 48 is the candidate in question.
Continuing observations are in progress.
GCN Circular #9440
A. N. Morgan, D. A. Perley, J. S. Bloom, (UC Berkeley), and D. Starr (UCB, LCOGT) report:
We observed the field of GRB 090530 (Cannizzo et al., GCN 9438) with the 1.3-m PAIRITEL located at Mt Hopkins, Arizona. Observations began at 2009-05-30 03:19:30 UT, 72 seconds after the Swift Trigger. We detect the optical afterglow (Cannizzo et al., GCN 9438, Flewelling et al., GCN 9439) in mosaics taken simultaneously in the J, H, and Ks filters.
The preliminary photometry yields:
```
post_burst
t_mid (min) exp(s)  filt  mag   merr
8.33        424     J     16.4  0.1
8.33        424     H     15.4  0.1
8.33        424     Ks    15.0  0.1
```
All magnitudes given in the Vega system, calibrated to 2MASS. No correction for Galactic extinction has been made to the above reported values. Observations are ongoing.
GCN Circular #9441
Markku Nissinen (Taurus Hill Observatory) and Veli-Pekka Hentunen (Taurus Hill Observatory) report:
We used Global-rent-a-scope GRAS002 Tak Mewlon 0.30m telescope with SBIG ST-8E CCD at RAS Observatory Mayhill H06 (New Mexico, USA) for follow-up observations of GRB090530 (J.K. Cannizzo et al., GCN 9438). The observations were started on May 30, at 05:30 UTC (2.2 hours after the burst) and stopped on May 30, at 06:16 UTC. Four unfiltered 600 seconds images were taken. We detected very faint optical afterglow object at the position of RA 11h 57m 39s.8 and Dec +26o 35' 47" (J2000) with possitional uncertainty of 10" with respect to POSSII F/USNO-B1.0. This is in correlation with ROTSE-III optical counterpart position (H. Flewelling et al., GCN 9439). Upper limit for the observations is >20.2 mag (3UL). Quoted upper limit has been derived using POSSII F and USNO-B1.0 field stars as reference.
```
Filter     Tmid(s)      Exp(s)     Mag (CR) USNO-B1.0

u         05:55:15      4x600      19.7
```
A jpeg preview of the observation showing the position of the afterglow is at this URL: http://cutenews.kassiopeia.net/data/upimages/GRB090530A_new.jpg
GCN Circular #9442
Markku Nissinen (Taurus Hill Observatory) and Veli-Pekka Hentunen (Taurus Hill Observatory) report:
We used Global-rent-a-scope GRAS002 Tak Mewlon 0.30m telescope with SBIG ST-8E CCD at RAS Observatory Mayhill H06 (New Mexico, USA) for follow-up observations of GRB090530 (J.K. Cannizzo et al., GCN 9438). The observations were started on May 30, at 05:30 UTC (2.2 hours after the burst) and stopped on May 30, at 06:16 UTC. Four unfiltered 600 seconds images were taken. We detected very faint optical afterglow object at the position of RA 11h 57m 40s.6 and Dec +26o 35' 38".7 (J2000) with respect to POSSII F/USNO-B1.0 and this is in good correlation with ROTSE-III optical counterpart position (H. Flewelling et al., GCN 9439). Upper limit for the observations is >20.2 mag (3UL). Quoted upper limit has been derived using POSSII F and USNO-B1.0 field stars as reference.
```
Filter     Tmid(s)      Exp(s)     Mag (CR) USNO-B1.0

u         05:55:15      4x600      19.2
```
A jpeg preview of the observation showing the position of the afterglow is at this URL: http://cutenews.kassiopeia.net/data/upimages/GRB090530.jpg
GCN Circular #9443
D. M. Palmer (LANL), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. K. Cannizzo (NASA/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (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 090530 (trigger #353567) (Cannizzo, et al., GCN Circ. 9438). The BAT ground-calculated position is RA, Dec = 179.400, 26.590 deg, which is
```
   RA(J2000)  =  11h 57m 36.0s 
   Dec(J2000) = +26d 35' 23.0" 
```
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 41%.
The mask-weighted light curve shows a FRED-like peak starting at ~T-0.3 sec, peaking at ~T+0.2 sec, and returning almost to background. Then a second and much smaller peak starts at ~T+35 sec, peaks at ~T+45 sec, and ends at ~T+50 sec. There is an ~3-sigma precursor peak at T-4sec. T90 (15-350 keV) is 48 +- 36 sec (estimated error including systematics).
The time-averaged spectrum from T-12.2 to T+51.8 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.61 +- 0.17. The fluence in the 15-150 keV band is 1.1 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.0 sec in the 15-150 keV band is 2.5 +- 0.3 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/353567/BA/
GCN Circular #9445
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 646 s of XRT Photon Counting mode data and 1 UVOT images for GRB 090530, 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 = 179.41846, +26.59341 which is equivalent to:
```
RA (J2000): 11h 57m 40.43s
Dec (J2000): +26d 35' 36.3"
```
with an uncertainty of 1.5 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, arXiv:0812.3662).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #9450
P. Schady (MSSL-UCL) and J. K. Cannizzo (NASA/UMBC) report on behalf of the Swift UVOT team:
The Swift/UVOT began settled observations of the field of GRB 090530 158s after the BAT trigger (Cannizzo et al., GCN Circ. 9438) and a decaying source is detected in all UVOT filters within the XRT error circle (Beardmore et al., GCN Circ. 9445), putting an upper limit on the redshift of z < 1.7. The source initially rises, and at around 100s after the BAT trigger decays at a constant rate of 0.73+/-0.03 for the duration of intial UVOT observations, out to ~20ks after the BAT trigger. The best UVOT position determined from a co-added white band exposure is
```
RA (J2000)  11:57:40.50   =  179.41873 (deg)
Dec (J2000) +26:35:38.4   =  +26.59400 (deg)
```
with an estimated uncertainty of 0.5 arcsec (radius, 90% confidence, statistical + systematic), consistent with the ROTSE-IIIb afterglow position (Flewelling et al., GCN Circ. 9439).
The magnitudes for the observations currently available are as follows:
```
Filter   T_start(s)  T_stop(s)  Exp(s)       Mag
white       83         233       147    17.43 +/- 0.03
v           624        644       19     17.69 +/- 0.29
b           550        570       19     18.60 +/- 0.27
u           295        545       246    17.46 +/- 0.05
uvw1        5735       5935      197    20.15 +/- 0.37
uvm2        5530       11687     1082   20.31 +/- 0.22
uvw2        5121       17468     1279   21.31 +/- 0.32
```
The values quoted above are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.02 in the direction of the burst (Schlegel et al. 1998). The photometry is on the UVOT photometric system described in Poole et al. (2008, MNRAS, 383, 627).
GCN Circular #9451
Mangano V., Sbarufatti B. (INAF-IASFPA), J. K. Cannizzo (NASA/UMBC) report on behalf of the Swift XRT Team:
We have analyzed the first five orbits of Swift-XRT data of GRB 090530 (trigger 353567; Cannizzo, et al., GCN Circ. 9438), consisting of 22 s in Windowed Timing (WT) mode from T+81 to T+103 s and 9 ks in Photon Counting (PC) mode from T+105 s to T+24.4 ks.
The best position for the X-ray afterglow is the XRT UVOT-enhanced position: RA, Dec = 179.41846, +26.59341 which is equivalent to:
```
RA (J2000): 11h 57m 40.43s
Dec (J2000): +26d 35' 36.3"
```
with an uncertainty of 1.5 arcsec (radius, 90% confidence), as given by Beardmore, et al., GCN Circ 9445.
The 0.3-10 keV X-ray light curve is best fitted by a broken powerlaw with early decay index of about -5.7, late decay index -0.60+/-0.04 and a break at about 140 s after the trigger. In the first orbit a small amplitude flare is detected at T+300 s. Flaring activity is also visible along the later decay. If decaying at the present rate, the predicted rate after 24h from the trigger is 2.0e-2 counts/s. However, we remark that a second break followed by a steepening of the lightcurve is possibly expected. The issue will be clarified with following Swift observations that will resume on Sunday May 31st.
The average initial WT spectrum (covering the initial steep decay) can be modeled as an absorbed power-law with index 2.3 (+0.5-0.4), absorbing column NH < 11E20 cm-2 (three sigma upper limit) and observed(unabsorbed) average flux in the 0.3-10 keV energy range of 2.9(3.6)E-10 ergs cm-2 s-1. The average PC spectrum (roughly covering the flatter part of the afterglow) is best fitted by an absorbed power-law with index 2.00+/-0.15 The absorbing column is NH = (8.2 -2.9+3.6)E20 cm-2 in excess with respect to the Galactic value of 1.78E+20 cm-2 (Kalberla et al. 2005). The average observed(unabsorbed) flux is 4.0(4.9)E-12 ergs cm-2 s-1. The count-rate to flux conversion factor is 5.4E-11. All quoted errors are at 90% confidence level.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00353567.
This circular is an official product of the Swift-XRT team.
GCN Circular #9452
D. Malesani, D. Xu, G. Leloudas, J.P.U. Fynbo (DARK/NBI), P. Jakobsson (Univ. Iceland), M.E. Brown (Caltech), E.L. Schaller (Univ. Hawaii), and T. Liimets (NOT & Tartu Obs.) report on behalf of a larger collaboration:
We observed the field of GRB 090530 (Cannizzo et al., GCN 9438) with the NOT equipped with the MOSCA camera. Observations were carried out in the R band, starting on 2009 May 30.879 UT (17.8 hr after the GRB).
The optical afterglow (Cannizzo et al., GCN 9438; Flewelling et al., GCN 9439; Morgan et al., GCN 9440) is clearly detected in a single 300s exposure, with a magnitude R = 21.6 assuming R = 18.17 for the USNO star at RA = 11:57:41.68, Dec = +26:35:43.3.
GCN Circular #9458
A. Rossi (Tautenburg), F. Olivares, and J. Greiner (both MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 090530 (Swift trigger 353567, Cannizzo et al., GCN #9438) simultaneously in g'r'i'z'JHK with GROND mounted at the 2.2m MPI/ESO telescope at La Silla Observatory (Chile). Observations started on 31 May 2009 at 00:36 UT, 21.3 h after the burst.
We detect the optical/NIR afterglow (Cannizzo et al., GCN #9438; Flewelling et al., GCN #9439; Morgan et al., GCN #9440; Nissinen & Hentunen, GCN #9442) in stacked exposures of 20 min in JHK and 24 min in g'r'i'z'.
Calibrating the r' band data against the USNO star at RA = 11:57:41.7, Dec = +26:35:43, we obtain R = (22.2 +-0.2) mag. Comparing this with the white light magnitudes obtained by ROTSE (Flewelling et al., GCN #9439), UVOT (Schady et al., GCN #9450) and GRAS002 (Nissinen & Hentunen, GCN #9442) as well as the NOT R-band magnitude (Malesani et al., GCN #9452), we find a break in the optical light at around 22 ksec post-burst (i.e. before the NOT observation), with slopes of 0.5+-0.1 (pre-break) and 1.8+-0.4 (post-break). We note that a break at this time is also visible in the Swift/XRT data (see repository; Evans et al. 2007).
GCN Circular #9459
M. Im (CEOU/Seoul National Univ) and Y. Urata (NCU) on behalf of EAFON team.
We observed GRB090530 (Cannizzo et al. GCN 9438) in R using the 1.0m telescope at Mt. Lemmon (Arizona, US) operated by the Korea Astronomy Space Science Institute. The R-band imaging started at 2009 May 30, 04:18:02 UT (~1 hr after the burst), with the mid-point at May 30, 04:45 UT.
In a stacked image of 9 frames (3 min exp. each), the optical afterglow is clearly detected at R=19.6 +- 0.15 mag. The photometry was calibrated against R2mag of USNO-B1 stars in the vicinity of GRB.
We thank the LOAO operator, J. Yoon for his assistance for this observation.
GCN Circular #9466
T. Sakamoto (UMBC/GSFC), D. Donato (ORAU/GSFC), N. Gehrels (GSFC), T. Okajima (JHU/GSFC), T. N. Ukwatta (GWU/GSFC), Y. Urata (NCU), C. Wallace (FGCU)
We observed the field of GRB 090530 detected by Swift (trigger #353567; Cannizzo et al., GCN #9438) with the 14-inch Goddard Robotic Telescope (GRT) located at the Goddard Geophysical and Astronomical Observatory (http://cddisa.gsfc.nasa.gov/ggao/).
100 set of 30 sec exposures were taken in the R filter starting from May 30 03:33:00 (UT) about 15 min after the trigger and stopped on May 30 04:29:30 (UT). We do not detect the optical afterglow (Cannizzo et al., GCN #9438, Flewelling et al., GCN #9439, Nissinen et al., GCN #9441, Malesani et al., GCN #9452, Im et al., GCN #9459) both in the individual images and the combined image. The estimated three sigma upper limit of the combined image (total exposure of 3000 sec) is ~18.1 mag using the USNO-B1 catalog.
GCN Circular #9478
J. Wren, W.T. Vestrand, P.R. Wozniak, H. Davis, B. Norman of Los Alamos National Laboratory report:
The RAPTOR telescope system responded to Swift trigger 353567 (Cannizzo et al., GCN 9438) under fair observing conditions. Our narrow-field instruments began observing the location at 03:18:37.96 UTC, 19.6 s after the Swift trigger. We detect the optical counterpart initially reported by Cannizzo et al. (GCN 9438) and Flewelling et al. (GCN 9439). Our first image at T+22.1 seconds shows the counterpart at R~17.1. It appears to brighten over the next minute reaching a peak near R~16.3 and then begins fading in the manner described by Schady et al. (GCN 9450) and Rossi et al. (GCN 9458). Our unfiltered images were calibrated against the USNO-B1 R-band. The following table gives selected observations, not corrected for extinction, from this event.
```
t-mid(s)    exp(s)     mag     mag-err
--------------------------------------------
22.08        5.0      17.13    0.25
57.90        5.0      16.30    0.10
84.50        5.0      16.60    0.13
133.21      10.0      16.87    0.11
414.65      30.0      17.31    0.09
```
GCN Circular #9487
S. Balman (METU), M. Parmaksizoglu (TUG) Z. Eker (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.) I. Bikmaev, N. Sakhibullin (KSU/AST) R. Burenin, M. Pavlinsky, R. Sunyaev (IKI),
report:
We observed the field of GRB 090530 (Swift trigger=353567, Cannizzo et al.,2009 GCN Circ. 9438) with the Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National Observatory, Turkey) on 30 May starting at 18:30:37.7 UT about 15.2 hours (0.633 d) after the burst using the TFOSC CCD (burst detected at 03:18:18 UT with Swift Burst Alert Telescope(BAT)).
Flewelling et al. 2009 GCN Circ. 9439 found the afterglow at 16.0 mag at 03:18:42.7 UT. Calibrating the data against the USNO star at RA = 11:57:41.7, Dec = +26:35:43, Rossi et al. 2009 GCN Circ. 9458 obtain R = (22.2 +-0.2) mag 21.3 hrs after burst. They also found a break in the optical light at around 22 ksec post-burst (see also GCN Circ.9440-9443, 9450-9452, 959, 9466, 9478 for white light and UV photometry).
We obtained one 900 sec exposure using the R band filter (Bessell filter). We used the Swift XRT position derived by Breadmore at al. (2009) GCN Circ. 9445 to locate the afterglow candidate. We were able see the source, but unable to calculate a magnitude using PSF photometry with DAOPHOT within MIDAS software performed on the 13.3 by 13.3 arcmin field around the candidate. We find a frame upper limit of R = 21.1+/-0.5 mag at 3 sigma and 21.9+/-0.5 mag at 2 sigma confidence level calculated using the same USNO star mentioned in the above paragraph.
This message can be cited.
GCN Circular #9488
D. Xu, G. Leloudas, D. Malesani, J. P. U. Fynbo, J. Hjorth (DARK/NBI), P. Jakobsson (Univ. Iceland), and T. Liimets (NOT & Tartu Obs.) report on behalf of a larger collaboration:
We continued to observe the field of GRB 090530 (Cannizzo et al., GCN 9438) with the Nordic Optical Telescope equipped with ALFOSC. We obtained 3x600 s R-band frames staring on June 01, 22:04:19 UT, 66.7669 hr after the burst.
The optical afterglow (Cannizzo et al., GCN 9438) is still detected in the stacked frame. The magnitude is R=22.6+/-0.2 against the same reference star in Malesani et al. (GCN 9452).
Balman et al. (GCN 9487) found a 3sigma upper limit of R=21.1+/-0.5 mag at 15.2 hr after the burst. Our first observation shows R=21.6 mag at 17.8 hr after the burst. Rossi et al. (GCN 9458) found R=22.2+/-0.2 mag at 21.3 hr after the burst, and a break in the light curve at around 22 ksec post-burst with slopes of 0.5+-0.1 (pre-break) and 1.8+-0.4 (post-break), using previous obs (Flewelling et al., GCN 9439; Schady et al., GCN 9450; Nissinen & Hentunen, GCN 9442). Our new observation indicates that the optical decay is becoming much slower. The slower optical decay may be due to the presence of a fairly bright host galaxy.
Further optical observations are encouraged.
GCN Report 222.1
GCN_Report 222.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_222_1.pdf by J.K. Cannizzo at NASA/UMBC titled: "Final Results on Swift GRB 090530"
GCN Circular #10015
A. Smith, A. LaCluyze, D. Reichart, D. Caton, L. Hawkins, J. Haislip, K. Ivarsen, A. Foster, J. Moore, A. Oza, M. Schubel, J. Styblova, A. Trotter, J. A. Crain, and M. Nysewander report:
Skynet observed the Swift/BAT localization of GRB 090530A (Cannizzo et al., GCN 9438) with the 14" Dark Sky Observatory telescope in North Carolina beginning 61.8 minutes after the trigger in RI.
We detect the afterglow (Cannizzo et al., GCN 9438). Stacking only images that increase the limiting magnitude yields:
```
mean                                                        1-sig.  1-sig.
time                                                        sys.    stat.
since                                            cal.       cal.    cal.
trig.  tel.    exp.     fil.  magnitude          stars*     unc.    unc.
(m)            (# x s)                                      (mag)   (mag)

88.8   DSO-14  20 x 80  I     19.26 +0.32 -0.25  7 SDSS 7   0.050   0.001
102.2  DSO-14  23 x 80  R     19.53 +0.16 -0.14  10 SDSS 7  0.022   0.001
```
* Transformed using Jester et al., 2005, ApJ, 130, 873.
1011.1205 from 5 Nov 10
T. Kr�hler et al.: Photometric redshifts for GRB afterglows from GROND and Swift/UVOT
We present a framework to obtain photometric redshifts (photo-zs) for gamma-ray burst afterglows. Using multi-band photometry from GROND and Swift/UVOT, photo-zs are derived for five GRBs for which spectroscopic redshifts are not available. We use UV/optical/NIR data and synthetic photometry based on afterglow observations and theory to derive the photometric redshifts of GRBs and their accuracy. Taking into account the afterglow synchrotron emission properties, we investigate the application of photometry to derive redshifts in a theoretical range between z~1 and z~12. The measurement of photo-zs for GRB afterglows provides a quick, robust and reliable determination of the distance scale to the burst, particularly in those cases where spectroscopic observations in the optical/NIR range cannot be obtained. Given a sufficiently bright and mildly reddened afterglow, the relative photo-z accuracy is better than 10% between z=1.5 and z~7 and better than 5% between z=2 and z=6. We detail the approach on 5 sources without spectroscopic redshifts observed with UVOT on-board Swift and/or GROND. The distance scale to those same afterglows is measured to be $z=4.31^{+0.14}_{-0.15}$ for GRB 080825B, $z=2.13^{+0.14}_{-0.20}$ for GRB 080906, $z=3.44^{+0.15}_{-0.32}$ for GRB 081228, $z=2.03^{+0.16}_{-0.14}$ for GRB 081230 and $z=1.28^{+0.16}_{-0.15}$ for GRB 090530. Combining the response from UVOT with ground-based observatories and in particular GROND operating in the optical/NIR wavelength regime, reliable photo-zs can be obtained from z ~ 1.0 out to z ~ 10, and possibly even at higher redshifts in some favorable cases, provided that these GRBs exist, are localized quickly, have sufficiently bright afterglows and are not heavily obscured.
GCN Circular #15571
P. Goldoni (APC/Irfu - CEA), A. de Ugarte Postigo (IAA - CSIC and DARK/NBI) and J.P.U. Fynbo (DARK/NBI) report on behalf of the X-shooter GRB collaboration :
We reduced with the most recent pipeline the observations of the optical afterglow of GRB 090530 (Cannizzo et al., GCN 9438) made using the ESO VLT equipped with the X-shooter spectrograph. The observations were performed during commissioning with the instrument not fully calibrated. The observations started on 2009-05-30 at 23:56 UT (i.e., 20.63 hr after the burst). A total exposure of 1x900 s + 4x1200 s was obtained, covering the spectral range from ~3000 to ~24000 Ang. The afterglow is detected in the UVB and VIS arms with a faint continuum. Superposed on the continuum we detected spectral features consistent with MgII, MgI, SiII, FeII and AlIII at a redshift ~1.266 fully consistent with the photometric redshift 1.28 (+0.16, -0.15) (Kruehler et al. 2011, A&A 526, 153).

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Jochen Greiner, last update: 03-Dec-2013 [Disclaimer]