Gamma-ray Burst 200509A

(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 09 May 20 06:48:04 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     970886,   Seg_Num: 0
GRB_RA:          116.450d {+07h 45m 48s} (J2000),
                 116.702d {+07h 46m 49s} (current),
                 115.829d {+07h 43m 19s} (1950)
GRB_DEC:          -4.641d {-04d 38' 28"} (J2000),
                  -4.692d {-04d 41' 30"} (current),
                  -4.519d {-04d 31' 06"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       13927 [cnts]    Image_Peak=365 [image_cnts]
TRIGGER_DUR:     4.096 [sec] 
TRIGGER_INDEX:   298     E_range: 25-100 keV
BKG_INTEN:       115041 [cnts]
BKG_TIME:        24383.09 SOD {06:46:23.09} UT
BKG_DUR:         40 [sec]
GRB_DATE:        18978 TJD;   130 DOY;   20/05/09
GRB_TIME:        24437.42 SOD {06:47:17.42} UT
GRB_PHI:         -171.08 [deg]
GRB_THETA:        46.50 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.15 [sigma]
IMAGE_SIGNIF:    10.20 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +2  +0  +0  +1 -30  +0 
SUN_POSTN:        46.66d {+03h 06m 38s}  +17.50d {+17d 29' 55"}
SUN_DIST:         72.55 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      253.16d {+16h 52m 39s}  -21.15d {-21d 08' 53"}
MOON_DIST:       130.11 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      223.39,  9.88 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      119.44,-25.42 [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 = 127.04,8.09 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 09 May 20 06:49:32 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     970886,   Seg_Num: 0
POINT_RA:        116.467d {+07h 45m 52s} (J2000)
POINT_DEC:        -4.646d {-04d 38' 45"} (J2000)
IMG_START_DATE:  18978 TJD;   130 DOY;   20/05/09
IMG_START_TIME:  24556.96 SOD {06:49:16.96} UT,   119.5 [sec] since BAT Trigger Time
COUNTS:          11    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        1    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 06 May 20 17:44:28 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     969823,   Seg_Num: 0
POINT_RA:        274.512d {+18h 18m 03s} (J2000)
POINT_DEC:       -16.146d {-16d 08' 45"} (J2000)
ROLL:            81.659d
IMG_START_DATE:  18975 TJD;   127 DOY;   20/05/06
IMG_START_TIME:  63475.66 SOD {17:37:55.66} UT,   65.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     610479500
X_OFFSET:        714 [pixels]
Y_OFFSET:        956 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       874
Y_GRB_POS:       1116
BINNING_INDEX:   1
IM_URL:          sw00969823000msuni0090.fits
SUN_POSTN:        44.18d {+02h 56m 44s}  +16.81d {+16d 48' 41"}
SUN_DIST:        131.59 [deg]   Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN:      215.84d {+14h 23m 21s}   -9.98d {-09d 58' 45"}
MOON_DIST:        57.60 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:       14.81, -0.15 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      274.37,  7.22 [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:     Sat 09 May 20 06:52:29 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     970886,   Seg_Num: 0
POINT_RA:        116.467d {+07h 45m 52s} (J2000)
POINT_DEC:        -4.646d {-04d 38' 46"} (J2000)
POINT_ROLL:      290.026d
IMG_START_DATE:  18978 TJD;   130 DOY;   20/05/09
IMG_START_TIME:  24560.65 SOD {06:49:20.65} UT,   123.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.775
N_STARS:         187
X_OFFSET:        577 [pixels]
Y_OFFSET:        467 [pixels]
X_MAX:           1536 [pixels]
Y_MAX:           1426 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00970886000msufc0123.fits
SUN_POSTN:        46.66d {+03h 06m 39s}  +17.50d {+17d 29' 58"}
SUN_DIST:         72.57 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      253.21d {+16h 52m 50s}  -21.16d {-21d 09' 25"}
MOON_DIST:       130.13 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      223.40,  9.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      119.46,-25.42 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 09 May 20 06:51:20 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     970886,   Seg_Num: 0
GRB_RA:          116.450d {+07h 45m 48s} (J2000),
                 116.702d {+07h 46m 49s} (current),
                 115.829d {+07h 43m 19s} (1950)
GRB_DEC:          -4.641d {-04d 38' 28"} (J2000),
                  -4.692d {-04d 41' 30"} (current),
                  -4.519d {-04d 31' 06"} (1950)
GRB_DATE:        18978 TJD;   130 DOY;   20/05/09
GRB_TIME:        24437.42 SOD {06:47:17.42} UT
TRIGGER_INDEX:   298
GRB_PHI:         -171.08 [deg]
GRB_THETA:        46.50 [deg]
DELTA_TIME:      6.00 [sec]
TRIGGER_DUR:     4.096 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.15 [sigma]
IMAGE_SIGNIF:    10.20 [sigma]
LC_URL:          sw00970886000msb.lc
SUN_POSTN:        46.66d {+03h 06m 39s}  +17.50d {+17d 29' 57"}
SUN_DIST:         72.55 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      253.20d {+16h 52m 47s}  -21.15d {-21d 09' 17"}
MOON_DIST:       130.14 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      223.39,  9.88 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      119.44,-25.42 [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 = 127.04,8.09 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 09 May 20 06:52:44 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     970886,   Seg_Num: 0
POINT_RA:        116.467d {+07h 45m 52s} (J2000)
POINT_DEC:        -4.646d {-04d 38' 46"} (J2000)
POINT_ROLL:      290.026d
IMG_START_DATE:  18978 TJD;   130 DOY;   20/05/09
IMG_START_TIME:  24560.65 SOD {06:49:20.65} UT,   123.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.775
N_STARS:         187
X_OFFSET:        577 [pixels]
Y_OFFSET:        467 [pixels]
X_MAX:           1536 [pixels]
Y_MAX:           1426 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00970886000msufc0123.fits
SUN_POSTN:        46.66d {+03h 06m 39s}  +17.50d {+17d 29' 58"}
SUN_DIST:         72.57 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      253.21d {+16h 52m 50s}  -21.16d {-21d 09' 27"}
MOON_DIST:       130.13 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      223.40,  9.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      119.46,-25.42 [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 09 May 20 06:54:13 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     970886,   Seg_Num: 0
POINT_RA:        116.467d {+07h 45m 52s} (J2000)
POINT_DEC:        -4.646d {-04d 38' 46"} (J2000)
ROLL:            290.026d
IMG_START_DATE:  18978 TJD;   130 DOY;   20/05/09
IMG_START_TIME:  24560.65 SOD {06:49:20.65} UT,   123.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     610699785
X_OFFSET:        896 [pixels]
Y_OFFSET:        786 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1056
Y_GRB_POS:       946
BINNING_INDEX:   1
IM_URL:          sw00970886000msuni0148.fits
SUN_POSTN:        46.66d {+03h 06m 39s}  +17.50d {+17d 29' 59"}
SUN_DIST:         72.57 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      253.23d {+16h 52m 54s}  -21.16d {-21d 09' 37"}
MOON_DIST:       130.14 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      223.40,  9.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      119.46,-25.42 [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:     Sat 09 May 20 06:53:37 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     970886,   Seg_Num: 0
GRB_RA:          116.4233d {+07h 45m 41.59s} (J2000),
                 116.6758d {+07h 46m 42.19s} (current),
                 115.8028d {+07h 43m 12.66s} (1950)
GRB_DEC:          -4.6308d {-04d 37' 50.8"} (J2000),
                  -4.6814d {-04d 40' 53.2"} (current),
                  -4.5083d {-04d 30' 29.7"} (1950)
GRB_ERROR:       4.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18978 TJD;   130 DOY;   20/05/09
IMG_START_TIME:  24577.00 SOD {06:49:37.00} UT,   139.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        46.66d {+03h 06m 39s}  +17.50d {+17d 29' 58"}
SUN_DIST:         72.52 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      253.22d {+16h 52m 53s}  -21.16d {-21d 09' 33"}
MOON_DIST:       130.18 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      223.37,  9.86 [deg] galactic lon,lat of the burst
ECL_COORDS:      119.41,-25.41 [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:     Sat 09 May 20 06:56:17 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     970886,   Seg_Num: 0
GRB_RA:          116.4216d {+07h 45m 41.18s} (J2000),
                 116.6741d {+07h 46m 41.79s} (current),
                 115.8011d {+07h 43m 12.25s} (1950)
GRB_DEC:          -4.6303d {-04d 37' 49.0"} (J2000),
                  -4.6809d {-04d 40' 51.3"} (current),
                  -4.5078d {-04d 30' 27.9"} (1950)
GRB_ERROR:       1.1 [arcsec radius, statistical only]
GRB_MAG:         19.14 +/- 0.40 [mag]
FILTER:          10, White
IMG_START_DATE:  18978 TJD;   130 DOY;   20/05/09
IMG_START_TIME:  24557.00 SOD {06:49:17.00} UT,   119.6 [sec] since BAT Trigger Time
SUN_POSTN:        46.66d {+03h 06m 39s}  +17.50d {+17d 30' 00"}
SUN_DIST:         72.52 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      253.25d {+16h 52m 59s}  -21.16d {-21d 09' 52"}
MOON_DIST:       130.21 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      223.37,  9.86 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      119.41,-25.41 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        Result based on srclist data.  
COMMENTS:        Notice generated automatically.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 09 May 20 06:54:00 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     970886,   Seg_Num: 0
POINT_RA:        116.467d {+07h 45m 52s} (J2000)
POINT_DEC:        -4.646d {-04d 38' 46"} (J2000)
ROLL:            290.026d
IMG_START_DATE:  18978 TJD;   130 DOY;   20/05/09
IMG_START_TIME:  24560.65 SOD {06:49:20.65} UT,   123.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     610699785
X_OFFSET:        896 [pixels]
Y_OFFSET:        786 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1056
Y_GRB_POS:       946
BINNING_INDEX:   1
IM_URL:          sw00970886000msuni0148.fits
SUN_POSTN:        46.66d {+03h 06m 39s}  +17.50d {+17d 29' 59"}
SUN_DIST:         72.57 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      253.22d {+16h 52m 54s}  -21.16d {-21d 09' 36"}
MOON_DIST:       130.14 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      223.40,  9.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      119.46,-25.42 [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:     Sat 09 May 20 06:59:13 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     970886,   Seg_Num: 0
POINT_RA:        116.468d {+07h 45m 52s} (J2000)
POINT_DEC:        -4.644d {-04d 38' 37"} (J2000)
POINT_ROLL:      290.025d
IMG_START_DATE:  18978 TJD;   130 DOY;   20/05/09
IMG_START_TIME:  24718.52 SOD {06:51:58.52} UT,   281.1 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.793
N_STARS:         190
X_OFFSET:        337 [pixels]
Y_OFFSET:        227 [pixels]
X_MAX:           1776 [pixels]
Y_MAX:           1666 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00970886000msufc0281.fits
SUN_POSTN:        46.67d {+03h 06m 40s}  +17.50d {+17d 30' 02"}
SUN_DIST:         72.56 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      253.28d {+16h 53m 07s}  -21.17d {-21d 10' 13"}
MOON_DIST:       130.18 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      223.40,  9.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      119.46,-25.42 [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 09 May 20 06:58:59 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     970886,   Seg_Num: 0
POINT_RA:        116.468d {+07h 45m 52s} (J2000)
POINT_DEC:        -4.644d {-04d 38' 37"} (J2000)
POINT_ROLL:      290.025d
IMG_START_DATE:  18978 TJD;   130 DOY;   20/05/09
IMG_START_TIME:  24718.52 SOD {06:51:58.52} UT,   281.1 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.793
N_STARS:         190
X_OFFSET:        337 [pixels]
Y_OFFSET:        227 [pixels]
X_MAX:           1776 [pixels]
Y_MAX:           1666 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00970886000msufc0281.fits
SUN_POSTN:        46.67d {+03h 06m 40s}  +17.50d {+17d 30' 02"}
SUN_DIST:         72.56 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      253.28d {+16h 53m 06s}  -21.17d {-21d 10' 11"}
MOON_DIST:       130.18 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      223.40,  9.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      119.46,-25.42 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 09 May 20 07:00:21 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     970886,   Seg_Num: 0
POINT_RA:        116.468d {+07h 45m 52s} (J2000)
POINT_DEC:        -4.644d {-04d 38' 37"} (J2000)
ROLL:            290.025d
IMG_START_DATE:  18978 TJD;   130 DOY;   20/05/09
IMG_START_TIME:  24718.52 SOD {06:51:58.52} UT,   281.1 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     610699943
X_OFFSET:        896 [pixels]
Y_OFFSET:        786 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1056
Y_GRB_POS:       946
BINNING_INDEX:   1
IM_URL:          sw00970886000msuni0306.fits
SUN_POSTN:        46.67d {+03h 06m 40s}  +17.50d {+17d 30' 03"}
SUN_DIST:         72.56 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      253.29d {+16h 53m 10s}  -21.17d {-21d 10' 21"}
MOON_DIST:       130.19 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      223.40,  9.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      119.46,-25.42 [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:     Sat 09 May 20 07:04:32 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     970886,   Seg_Num: 0
POINT_RA:        116.468d {+07h 45m 52s} (J2000)
POINT_DEC:        -4.644d {-04d 38' 37"} (J2000)
POINT_ROLL:      290.025d
IMG_START_DATE:  18978 TJD;   130 DOY;   20/05/09
IMG_START_TIME:  25297.53 SOD {07:01:37.53} UT,   860.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.750
N_STARS:         190
X_OFFSET:        337 [pixels]
Y_OFFSET:        227 [pixels]
X_MAX:           1776 [pixels]
Y_MAX:           1666 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00970886000msufc0860.fits
SUN_POSTN:        46.67d {+03h 06m 41s}  +17.50d {+17d 30' 06"}
SUN_DIST:         72.56 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      253.33d {+16h 53m 20s}  -21.18d {-21d 10' 51"}
MOON_DIST:       130.22 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      223.40,  9.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      119.46,-25.42 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 09 May 20 07:04:43 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     970886,   Seg_Num: 0
POINT_RA:        116.468d {+07h 45m 52s} (J2000)
POINT_DEC:        -4.644d {-04d 38' 37"} (J2000)
POINT_ROLL:      290.025d
IMG_START_DATE:  18978 TJD;   130 DOY;   20/05/09
IMG_START_TIME:  25297.53 SOD {07:01:37.53} UT,   860.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.750
N_STARS:         190
X_OFFSET:        337 [pixels]
Y_OFFSET:        227 [pixels]
X_MAX:           1776 [pixels]
Y_MAX:           1666 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00970886000msufc0860.fits
SUN_POSTN:        46.67d {+03h 06m 41s}  +17.50d {+17d 30' 06"}
SUN_DIST:         72.56 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      253.34d {+16h 53m 21s}  -21.18d {-21d 10' 52"}
MOON_DIST:       130.23 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      223.40,  9.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      119.46,-25.42 [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 09 May 20 07:06:08 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     970886,   Seg_Num: 0
POINT_RA:        116.468d {+07h 45m 52s} (J2000)
POINT_DEC:        -4.644d {-04d 38' 37"} (J2000)
ROLL:            290.025d
IMG_START_DATE:  18978 TJD;   130 DOY;   20/05/09
IMG_START_TIME:  25297.53 SOD {07:01:37.53} UT,   860.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     610700522
X_OFFSET:        896 [pixels]
Y_OFFSET:        786 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1056
Y_GRB_POS:       946
BINNING_INDEX:   1
IM_URL:          sw00970886000msuni0885.fits
SUN_POSTN:        46.67d {+03h 06m 41s}  +17.50d {+17d 30' 07"}
SUN_DIST:         72.56 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      253.35d {+16h 53m 24s}  -21.18d {-21d 11' 02"}
MOON_DIST:       130.24 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      223.40,  9.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      119.46,-25.42 [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:     Sat 09 May 20 07:00:31 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     970886,   Seg_Num: 0
POINT_RA:        116.468d {+07h 45m 52s} (J2000)
POINT_DEC:        -4.644d {-04d 38' 37"} (J2000)
ROLL:            290.025d
IMG_START_DATE:  18978 TJD;   130 DOY;   20/05/09
IMG_START_TIME:  24718.52 SOD {06:51:58.52} UT,   281.1 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     610699943
X_OFFSET:        896 [pixels]
Y_OFFSET:        786 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1056
Y_GRB_POS:       946
BINNING_INDEX:   1
IM_URL:          sw00970886000msuni0306.fits
SUN_POSTN:        46.67d {+03h 06m 40s}  +17.50d {+17d 30' 03"}
SUN_DIST:         72.56 [deg]   Sun_angle= -4.7 [hr] (East of Sun)
MOON_POSTN:      253.29d {+16h 53m 10s}  -21.17d {-21d 10' 22"}
MOON_DIST:       130.19 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      223.40,  9.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      119.46,-25.42 [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 #27701
E. Troja (NASA/GSFC/UMCP), V. D'Elia (SSDC), J.D. Gropp (PSU), N. J. Klingler (PSU), K. L. Page (U Leicester), B. Sbarufatti (PSU), M. H. Siegel (PSU) and A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift Observatory Team:
At 06:47:17 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 200509A (trigger=970886). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 116.450, -4.641 which is
```
   RA(J2000) = 07h 45m 48s
   Dec(J2000) = -04d 38' 28"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 20 sec. There is also possible further activity for several hundred seconds The peak count rate was ~1400 counts/sec (15-350 keV), at ~4 sec after the trigger.
The XRT began observing the field at 06:49:16.9 UT, 119.6 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 116.42333, -4.63131 which is equivalent to:
```
   RA(J2000)  = 07h 45m 41.60s
   Dec(J2000) = -04d 37' 52.7"
```
with an uncertainty of 3.5 arcseconds (radius, 90% containment). This location is 101 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 https://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (1.58 x 10^21 cm^-2, Willingale et al. 2013), with an excess column of 5.2 (+4.12/-3.39) x 10^21 cm^-2 (90% confidence).
UVOT took a finding chart exposure of nominal 150.000 seconds with the White filter starting 123 seconds after the BAT trigger. There is a candidate afterglow in the list of sources generated on-board at
```
 RA(J2000)  =	07:45:41.20 = 116.42166
 DEC(J2000) = -04:37:49.4  =  -4.63040
```
with a 90%-confidence error radius of about 1.10 arc sec. This position is 6.4 arc sec. from the center of the XRT error circle. The estimated magnitude is 19.15. No correction has been made for the expected extinction corresponding to E(B-V) of 0.13. The 2.7'x2.7' sub-image does not cover the region of this potential counterpart.
Burst Advocate for this burst is E. Troja (eleonora.troja AT 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/)
GCN Circular #27702
B. Gendre, E. Moore, D. Coward, J.A. Moore (OzGrav-UWA), A. Klotz (IRAP-CNRS-OMP) report:
We imaged the field of GRB 200509A detected by Swift (trigger 970886, GCN 27701, Troja et al. 2020) with the Zadko robotic telescope (D=100cm) located at the Zadko Observatory - Gingin, Australia.
The observations started about 6 hours after the GRB trigger. The elevation of the field was at 41 degrees above horizon at the start of the observation and decreasing, and weather conditions were good.
Inside the error box of the XRT afterglow, we did not detect any object at 2020-05-09T13:00:00, down to a R magnitude of 18.2. No further observations are planned.
Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.
This message may be cited.
GCN Circular #27703
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 799 s of XRT Photon Counting mode data and 2 UVOT images for GRB 200509A, 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 = 116.42238, -4.63042 which is equivalent to:
```
RA (J2000): 07h 45m 41.37s
Dec (J2000): -04d 37' 49.5"
```
with an uncertainty of 1.7 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #27704
A. D'Ai (INAF-IASFPA), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), A. Melandri (INAF-OAB), T. Sbarrato (INAF-OAB) and E. Troja report on behalf of the Swift-XRT team:
We have analysed 9.4 ks of XRT data for GRB 200509A (Troja et al. GCN Circ. 27701), from 104 s to 34.9 ks after the BAT trigger. The data comprise 7 s in Windowed Timing (WT) mode (taken while Swift was slewing), with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN Circ. 27703). The late-time light curve (from T0+5.0 ks) is consistent with a constant source of mean count rate 1.8e-01 ct/sec. A power-law fit gives an index of -0.2 (+/-1.2).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.725 (+/-0.020). The best-fitting absorption column is 1.89 (+0.08, -0.07) x 10^21 cm^-2, in excess of the Galactic value of 1.6 x 10^21 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.55 (+0.10, -0.08) and a best-fitting absorption column consistent with the Galactic value. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.5 x 10^-11 (5.1 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.58 (+0.17, -0.00) x 10^21 cm^-2
Galactic foreground: 1.6 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.55 (+0.10, -0.08)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00970886.
This circular is an official product of the Swift-XRT team.
GCN Circular #27705
R. Strausbaugh (U. of the Virgin Islands), A. Cucchiara (U. of the Virgin Islands/College of Marin) report on behalf of a larger collaboration:
We observed Swift GRB 200509A (Troja et al., GCN 27701) with the LCO 1-m Sinistro instrument at the South African Astronomical Observatory site, on May 9, from 16:46 to 17:08 UT (corresponding to 9.63 to 10.0 hours from the GRB trigger time) with the Bessel R and I filters.
We performed a series of 5x120s exposures in R and I. We detect an optical source in stacked images within the Enhanced Swift-XRT position (Evans et al., GCN 27703) that is not present in either USNO or 2MASS catalogs. Using the USNO-B.1 catalog as reference, we calculate the following magnitudes:
R = 20.94 +/- 0.09
I = 19.44 +/- 0.18
These magnitudes are not corrected for galactic extinction.
R.S. is funded by NSF AST grant #1831682
GCN Circular #27706
V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA),
H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE),
R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias),
D. Buckley (South African Astronomical Observatory),
O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University)
MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) was pointed to the Swift GRB 200509A ( E. Troja et al., GCN 27701) errorbox 42927 sec after notice time and 42979 sec after trigger time at 2020-05-09 18:43:37 UT, with upper limit up to 19.1 mag. The observations began at zenith distance = 56 deg. The sun altitude is -36.1 deg.
The galactic latitude b = 10 deg., longitude l = 224 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1352906
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

   43070 |         MASTER-SAAO |   C |   180 | 19.1 |        
   43070 |         MASTER-SAAO |   C |   180 | 19.0 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #27709
N. P. M. Kuin (UCL-MSSL) and E. Troja (NASA/GSFC/UMCP) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 200509A 123 s after the BAT trigger (Troja et al., GCN Circ. 27701). A source consistent with the XRT position (Troja et al. GCN Circ. 27701) is detected in the initial UVOT exposures.
The preliminary UVOT position is:
```
    RA  (J2000) =  07:45:41.28 = 116.42200 (deg.)
    Dec (J2000) = -04:37:49.3  =  -4.63035 (deg.)
```
with an estimated uncertainty of 0.48 arc sec. (radius, 90% confidence).
Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white              123          273          147         18.92 +/- 0.08
v                  611         1738          122        >18.6
b                  537         1678          117        >19.8
u                  281          531          246         18.46 +/- 0.10
w1                 660         1628          117        >19.0
m2                 636         1604          117        >19.0
w2                 587         1728          136        >19.6
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.13 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #27710
H. Kumar, V. Bhalerao(IITB), G. C. Anupama, S. Barway, T. Stanzin (IIA), J. Stanzin (IAO) report on behalf of the GROWTH-India collaboration:
We observed GRB200509A reported by (Troja et al., GCN 27701, Gendre et al., GCN 27702, Evans et al., GCN 27703, Lipunov et al., GCN 27706, Kuin et al., GCN 27709) with 0.7m GROWTH-India telescope. We obtained a 550 sec r band exposure starting at UT 2020-05-09T15:04:19. The field was observed at low altitude (< 25 deg). We did not detect any new source up to 19.7 mag within an uncertainty region of 1.7 arcsec (radius, 90% confidence) around RA(J2000) = 07h 45m 41.37s, Dec(J2000) = -04d 37' 49.5" (Evans et al., GCN 27703).
The GROWTH India Telescope (GIT) is a 70-cm telescope with a 0.7 degree field of view, set up by the Indian Institute of Astrophysics and the Indian Institute of Technology Bombay with support from the Indo-US Science and Technology Forum (IUSSTF) and the Science and Engineering Research Board (SERB) of the Department of Science and Technology (DST), Government of India (https://sites.google.com/view/growthindia/). It is located at the Indian Astronomical Observatory (Hanle), operated by the Indian Institute of Astrophysics (IIA).
GCN Circular #27713
D. M. Palmer (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), T. Sakamoto (AGU), M. Stamatikos (OSU), E. Troja (NASA/GSFC/UMCP), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 200509A (trigger #970886) (Troja et al., GCN Circ. 27701). The BAT ground-calculated position is RA, Dec = 116.415, -4.634 deg which is
```
   RA(J2000)  =  07h 45m 39.6s
   Dec(J2000) = -04d 38' 02.5"
```
with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 39%.
The mask-weighted light curve shows a multi-peaked structure that starts at ~T0 and ends at ~T+850 s. The three prominent peaks occur at ~T0, ~T+600 s, and ~T+820 s, respectively. There might be additional burst emission beyond the available event data range (i.e., > T+963 s). T90 (15-350 keV) is 828.2 +- 13.4 sec (estimated error including systematics).
The time-averaged spectrum from T-0.80 to T+848.99 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.67 +- 0.09. The fluence in the 15-150 keV band is 7.3 +- 0.4 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+822.69 sec in the 15-150 keV band is 1.5 +- 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/970886/BA/

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Jochen Greiner, last update: 10-May-2020 [Disclaimer]