Gamma-ray Burst 100522A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 22 May 10 03:46:08 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     296192754
GRB_RA:           10.183d {+00h 40m 44s} (J2000),
                  10.318d {+00h 41m 16s} (current),
                   9.534d {+00h 38m 08s} (1950)
GRB_DEC:         +10.217d {+10d 12' 60"} (J2000),
                 +10.274d {+10d 16' 25"} (current),
                  +9.942d {+09d 56' 32"} (1950)
GRB_ERROR:       5.57 [deg radius, statistical plus systematic]
GRB_INTEN:       389 [cnts/sec]
DATA_SIGNIF:     18.80 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        15338 TJD;   142 DOY;   10/05/22
GRB_TIME:        13552.29 SOD {03:45:52.29} UT
GRB_PHI:           5.00 [deg]
GRB_THETA:        85.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      1.18
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   1%  Generic SGR
SUN_POSTN:        58.82d {+03h 55m 18s}  +20.35d {+20d 21' 01"}
SUN_DIST:         47.68 [deg]   Sun_angle= 3.2 [hr] (West of Sun)
MOON_POSTN:      165.68d {+11h 02m 44s}   +1.07d {+01d 04' 13"}
MOON_DIST:       152.99 [deg]
MOON_ILLUM:      63 [%]
GAL_COORDS:      118.60,-52.57 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       13.37,  5.37 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 22 May 10 03:46:18 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      59
TRIGGER_NUM:     296192754
GRB_RA:           10.267d {+00h 41m 04s} (J2000),
                  10.402d {+00h 41m 36s} (current),
                   9.617d {+00h 38m 28s} (1950)
GRB_DEC:         +10.267d {+10d 15' 60"} (J2000),
                 +10.323d {+10d 19' 25"} (current),
                  +9.992d {+09d 59' 33"} (1950)
GRB_ERROR:       5.97 [deg radius, statistical plus systematic]
GRB_INTEN:       317 [cnts/sec]
DATA_SIGNIF:     22.00 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        15338 TJD;   142 DOY;   10/05/22
GRB_TIME:        13552.29 SOD {03:45:52.29} UT
GRB_PHI:           5.00 [deg]
GRB_THETA:        85.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      1.16
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   1%  Generic SGR
SUN_POSTN:        58.82d {+03h 55m 18s}  +20.35d {+20d 21' 01"}
SUN_DIST:         47.59 [deg]   Sun_angle= 3.2 [hr] (West of Sun)
MOON_POSTN:      165.69d {+11h 02m 45s}   +1.07d {+01d 04' 11"}
MOON_DIST:       152.90 [deg]
MOON_ILLUM:      63 [%]
GAL_COORDS:      118.74,-52.52 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       13.46,  5.38 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 22 May 10 03:56:12 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     422783,   Seg_Num: 0
GRB_RA:            6.983d {+00h 27m 56s} (J2000),
                   7.117d {+00h 28m 28s} (current),
                   6.337d {+00h 25m 21s} (1950)
GRB_DEC:          +9.417d {+09d 25' 03"} (J2000),
                  +9.475d {+09d 28' 29"} (current),
                  +9.141d {+09d 08' 27"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       1119 [cnts]    Image_Peak=131 [image_cnts]
TRIGGER_DUR:     0.128 [sec] 
TRIGGER_INDEX:   122     E_range: 25-100 keV
BKG_INTEN:       31689 [cnts]
BKG_TIME:        13538.17 SOD {03:45:38.17} UT
BKG_DUR:         8 [sec]
GRB_DATE:        15338 TJD;   142 DOY;   10/05/22
GRB_TIME:        13552.32 SOD {03:45:52.32} UT
GRB_PHI:         -65.84 [deg]
GRB_THETA:        22.44 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     26.90 [sigma]
IMAGE_SIGNIF:    11.03 [sigma]
MERIT_PARAMS:     +1  +0  +0  -3  +2  +0  +0  +0 -63  +0 
SUN_POSTN:        58.83d {+03h 55m 20s}  +20.35d {+20d 21' 06"}
SUN_DIST:         50.93 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      165.77d {+11h 03m 06s}   +1.03d {+01d 01' 43"}
MOON_DIST:       156.29 [deg]
MOON_ILLUM:      64 [%]
GAL_COORDS:      113.27,-53.01 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       10.14,  5.88 [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 = 18.04,-20.20 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 22 May 10 03:57:05 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     422783,   Seg_Num: 0
GRB_RA:            6.9851d {+00h 27m 56.4s} (J2000),
                   7.1194d {+00h 28m 28.6s} (current),
                   6.3393d {+00h 25m 21.4s} (1950)
GRB_DEC:          +9.4017d {+09d 24' 06.1"} (J2000),
                  +9.4591d {+09d 27' 32.7"} (current),
                  +9.1252d {+09d 07' 30.6"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       83 [cnts]
IMG_START_DATE:  15338 TJD;   142 DOY;   10/05/22
IMG_START_TIME:  13617.67 SOD {03:46:57.67} UT,   65.4 [sec] since BAT Trigger Time
CENTROID_X:      272.68,  raw= 273  [pixels]
CENTROID_Y:      276.35,  raw= 276  [pixels]
ROLL:            71.37 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -51.01
GRB_POS_XRT_Z:   -69.80
IMAGE_URL:       sw00422783000msxps_rw.img
SUN_POSTN:        58.83d {+03h 55m 20s}  +20.35d {+20d 21' 07"}
SUN_DIST:         50.94 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      165.78d {+11h 03m 08s}   +1.02d {+01d 01' 30"}
MOON_DIST:       156.31 [deg]
MOON_ILLUM:      64 [%]
GAL_COORDS:      113.27,-53.03 [deg] galactic lon,lat of the burst
ECL_COORDS:       10.14,  5.86 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 22 May 10 03:56:57 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     422783,   Seg_Num: 0
GRB_RA:            6.9851d {+00h 27m 56.4s} (J2000),
                   7.1194d {+00h 28m 28.6s} (current),
                   6.3393d {+00h 25m 21.4s} (1950)
GRB_DEC:          +9.4017d {+09d 24' 06.1"} (J2000),
                  +9.4591d {+09d 27' 32.7"} (current),
                  +9.1252d {+09d 07' 30.6"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       83 [cnts]
IMG_START_DATE:  15338 TJD;   142 DOY;   10/05/22
IMG_START_TIME:  13617.67 SOD {03:46:57.67} UT,   65.4 [sec] since BAT Trigger Time
CENTROID_X:      272.68,  raw= 273  [pixels]
CENTROID_Y:      276.35,  raw= 276  [pixels]
ROLL:            71.37 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -51.01
GRB_POS_XRT_Z:   -69.80
IMAGE_URL:       sw00422783000msxps_rw.img
SUN_POSTN:        58.83d {+03h 55m 20s}  +20.35d {+20d 21' 07"}
SUN_DIST:         50.94 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      165.78d {+11h 03m 07s}   +1.03d {+01d 01' 32"}
MOON_DIST:       156.30 [deg]
MOON_ILLUM:      64 [%]
GAL_COORDS:      113.27,-53.03 [deg] galactic lon,lat of the burst
ECL_COORDS:       10.14,  5.86 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 22 May 10 03:57:56 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     422783,   Seg_Num: 0
GRB_RA:            6.983d {+00h 27m 56s} (J2000),
                   7.117d {+00h 28m 28s} (current),
                   6.337d {+00h 25m 21s} (1950)
GRB_DEC:          +9.417d {+09d 25' 03"} (J2000),
                  +9.475d {+09d 28' 29"} (current),
                  +9.141d {+09d 08' 27"} (1950)
GRB_DATE:        15338 TJD;   142 DOY;   10/05/22
GRB_TIME:        13552.32 SOD {03:45:52.32} UT
TRIGGER_INDEX:   122
GRB_PHI:         -65.84 [deg]
GRB_THETA:        22.44 [deg]
DELTA_TIME:      25.00 [sec]
TRIGGER_DUR:     0.128 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     26.90 [sigma]
IMAGE_SIGNIF:    11.03 [sigma]
LC_URL:          sw00422783000msb.lc
SUN_POSTN:        58.83d {+03h 55m 20s}  +20.35d {+20d 21' 07"}
SUN_DIST:         50.93 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      165.79d {+11h 03m 09s}   +1.02d {+01d 01' 17"}
MOON_DIST:       156.31 [deg]
MOON_ILLUM:      64 [%]
GAL_COORDS:      113.27,-53.01 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       10.14,  5.88 [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 = 18.04,-20.20 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 22 May 10 03:56:47 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     422783,   Seg_Num: 0
GRB_RA:            6.9851d {+00h 27m 56.42s} (J2000),
                   7.1194d {+00h 28m 28.64s} (current),
                   6.3393d {+00h 25m 21.43s} (1950)
GRB_DEC:          +9.4017d {+09d 24' 06.1"} (J2000),
                  +9.4591d {+09d 27' 32.7"} (current),
                  +9.1252d {+09d 07' 30.6"} (1950)
GRB_ERROR:       5.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       2.40e-09 [erg/cm2/sec]
GRB_SIGNIF:      9.11 [sigma]
IMG_START_DATE:  15338 TJD;   142 DOY;   10/05/22
IMG_START_TIME:  13617.67 SOD {03:46:57.67} UT,   65.4 [sec] since BAT Trigger Time
TAM[0-3]:        327.68 237.23 261.64 243.42
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        58.83d {+03h 55m 20s}  +20.35d {+20d 21' 07"}
SUN_DIST:         50.94 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      165.78d {+11h 03m 07s}   +1.03d {+01d 01' 34"}
MOON_DIST:       156.30 [deg]
MOON_ILLUM:      64 [%]
GAL_COORDS:      113.27,-53.03 [deg] galactic lon,lat of the burst
ECL_COORDS:       10.14,  5.86 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.95 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 22 May 10 03:59:12 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     422783,   Seg_Num: 0
POINT_RA:          6.962d {+00h 27m 51s} (J2000)
POINT_DEC:        +9.409d {+09d 24' 32"} (J2000)
POINT_ROLL:      71.367d
IMG_START_DATE:  15338 TJD;   142 DOY;   10/05/22
IMG_START_TIME:  13626.09 SOD {03:47:06.09} UT,   73.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.405
N_STARS:         35
X_OFFSET:        632 [pixels]
Y_OFFSET:        472 [pixels]
X_MAX:           1591 [pixels]
Y_MAX:           1431 [pixels]
DET_THRESH:      24
PHOTO_THRESH:    14
SL_URL:          sw00422783000msufc0073.fits
SUN_POSTN:        58.83d {+03h 55m 20s}  +20.35d {+20d 21' 08"}
SUN_DIST:         50.96 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      165.80d {+11h 03m 12s}   +1.02d {+01d 00' 58"}
MOON_DIST:       156.34 [deg]
MOON_ILLUM:      64 [%]
GAL_COORDS:      113.23,-53.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.12,  5.88 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 22 May 10 03:59:33 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     422783,   Seg_Num: 0
POINT_RA:          6.962d {+00h 27m 51s} (J2000)
POINT_DEC:        +9.409d {+09d 24' 32"} (J2000)
POINT_ROLL:      71.367d
IMG_START_DATE:  15338 TJD;   142 DOY;   10/05/22
IMG_START_TIME:  13626.09 SOD {03:47:06.09} UT,   73.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.405
N_STARS:         35
X_OFFSET:        632 [pixels]
Y_OFFSET:        472 [pixels]
X_MAX:           1591 [pixels]
Y_MAX:           1431 [pixels]
DET_THRESH:      24
PHOTO_THRESH:    14
SL_URL:          sw00422783000msufc0073.fits
SUN_POSTN:        58.83d {+03h 55m 20s}  +20.35d {+20d 21' 08"}
SUN_DIST:         50.96 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      165.80d {+11h 03m 13s}   +1.01d {+01d 00' 53"}
MOON_DIST:       156.35 [deg]
MOON_ILLUM:      64 [%]
GAL_COORDS:      113.23,-53.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.12,  5.88 [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 22 May 10 03:59:12 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     422783,   Seg_Num: 0
POINT_RA:          6.962d {+00h 27m 51s} (J2000)
POINT_DEC:        +9.409d {+09d 24' 32"} (J2000)
POINT_ROLL:      71.367d
IMG_START_DATE:  15338 TJD;   142 DOY;   10/05/22
IMG_START_TIME:  13626.09 SOD {03:47:06.09} UT,   73.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.405
N_STARS:         35
X_OFFSET:        632 [pixels]
Y_OFFSET:        472 [pixels]
X_MAX:           1591 [pixels]
Y_MAX:           1431 [pixels]
DET_THRESH:      24
PHOTO_THRESH:    14
SL_URL:          sw00422783000msufc0073.fits
SUN_POSTN:        58.83d {+03h 55m 20s}  +20.35d {+20d 21' 08"}
SUN_DIST:         50.96 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      165.80d {+11h 03m 12s}   +1.02d {+01d 00' 58"}
MOON_DIST:       156.34 [deg]
MOON_ILLUM:      64 [%]
GAL_COORDS:      113.23,-53.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.12,  5.88 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 22 May 10 04:01:33 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     422783,   Seg_Num: 0
POINT_RA:          6.962d {+00h 27m 51s} (J2000)
POINT_DEC:        +9.409d {+09d 24' 32"} (J2000)
ROLL:            71.367d
IMG_START_DATE:  15338 TJD;   142 DOY;   10/05/22
IMG_START_TIME:  13626.09 SOD {03:47:06.09} UT,   73.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     296192831
X_OFFSET:        982 [pixels]
Y_OFFSET:        894 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1142
Y_GRB_POS:       1054
BINNING_INDEX:   1
IM_URL:          sw00422783000msuni0079.fits
SUN_POSTN:        58.84d {+03h 55m 21s}  +20.35d {+20d 21' 09"}
SUN_DIST:         50.96 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      165.82d {+11h 03m 17s}   +1.01d {+01d 00' 23"}
MOON_DIST:       156.37 [deg]
MOON_ILLUM:      64 [%]
GAL_COORDS:      113.23,-53.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.12,  5.88 [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 22 May 10 04:01:50 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     422783,   Seg_Num: 0
POINT_RA:          6.962d {+00h 27m 51s} (J2000)
POINT_DEC:        +9.409d {+09d 24' 32"} (J2000)
ROLL:            71.367d
IMG_START_DATE:  15338 TJD;   142 DOY;   10/05/22
IMG_START_TIME:  13626.09 SOD {03:47:06.09} UT,   73.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     296192831
X_OFFSET:        982 [pixels]
Y_OFFSET:        894 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1142
Y_GRB_POS:       1054
BINNING_INDEX:   1
IM_URL:          sw00422783000msuni0079.fits
SUN_POSTN:        58.84d {+03h 55m 21s}  +20.35d {+20d 21' 09"}
SUN_DIST:         50.96 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      165.82d {+11h 03m 18s}   +1.01d {+01d 00' 19"}
MOON_DIST:       156.37 [deg]
MOON_ILLUM:      64 [%]
GAL_COORDS:      113.23,-53.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.12,  5.88 [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 22 May 10 04:05:16 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     422783,   Seg_Num: 0
POINT_RA:          6.960d {+00h 27m 50s} (J2000)
POINT_DEC:        +9.409d {+09d 24' 32"} (J2000)
POINT_ROLL:      71.367d
IMG_START_DATE:  15338 TJD;   142 DOY;   10/05/22
IMG_START_TIME:  13838.11 SOD {03:50:38.11} UT,   285.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.269
N_STARS:         70
X_OFFSET:        662 [pixels]
Y_OFFSET:        574 [pixels]
X_MAX:           1621 [pixels]
Y_MAX:           1533 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00422783000msufc0285.fits
SUN_POSTN:        58.84d {+03h 55m 21s}  +20.35d {+20d 21' 11"}
SUN_DIST:         50.96 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      165.85d {+11h 03m 25s}   +0.99d {+00d 59' 27"}
MOON_DIST:       156.40 [deg]
MOON_ILLUM:      64 [%]
GAL_COORDS:      113.23,-53.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.12,  5.88 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 22 May 10 04:05:16 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     422783,   Seg_Num: 0
POINT_RA:          6.960d {+00h 27m 50s} (J2000)
POINT_DEC:        +9.409d {+09d 24' 32"} (J2000)
POINT_ROLL:      71.367d
IMG_START_DATE:  15338 TJD;   142 DOY;   10/05/22
IMG_START_TIME:  13838.11 SOD {03:50:38.11} UT,   285.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.269
N_STARS:         70
X_OFFSET:        662 [pixels]
Y_OFFSET:        574 [pixels]
X_MAX:           1621 [pixels]
Y_MAX:           1533 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00422783000msufc0285.fits
SUN_POSTN:        58.84d {+03h 55m 21s}  +20.35d {+20d 21' 11"}
SUN_DIST:         50.96 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      165.85d {+11h 03m 25s}   +0.99d {+00d 59' 27"}
MOON_DIST:       156.40 [deg]
MOON_ILLUM:      64 [%]
GAL_COORDS:      113.23,-53.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.12,  5.88 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 22 May 10 04:05:29 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     422783,   Seg_Num: 0
POINT_RA:          6.960d {+00h 27m 50s} (J2000)
POINT_DEC:        +9.409d {+09d 24' 32"} (J2000)
ROLL:            71.367d
IMG_START_DATE:  15338 TJD;   142 DOY;   10/05/22
IMG_START_TIME:  13838.11 SOD {03:50:38.11} UT,   285.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     296193043
X_OFFSET:        982 [pixels]
Y_OFFSET:        894 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1142
Y_GRB_POS:       1054
BINNING_INDEX:   1
IM_URL:          sw00422783000msuni0291.fits
SUN_POSTN:        58.84d {+03h 55m 21s}  +20.35d {+20d 21' 11"}
SUN_DIST:         50.96 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      165.86d {+11h 03m 25s}   +0.99d {+00d 59' 24"}
MOON_DIST:       156.41 [deg]
MOON_ILLUM:      64 [%]
GAL_COORDS:      113.23,-53.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.12,  5.88 [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 22 May 10 04:05:38 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     422783,   Seg_Num: 0
POINT_RA:          6.960d {+00h 27m 50s} (J2000)
POINT_DEC:        +9.409d {+09d 24' 32"} (J2000)
POINT_ROLL:      71.367d
IMG_START_DATE:  15338 TJD;   142 DOY;   10/05/22
IMG_START_TIME:  13838.11 SOD {03:50:38.11} UT,   285.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        2.269
N_STARS:         70
X_OFFSET:        662 [pixels]
Y_OFFSET:        574 [pixels]
X_MAX:           1621 [pixels]
Y_MAX:           1533 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00422783000msufc0285.fits
SUN_POSTN:        58.84d {+03h 55m 21s}  +20.35d {+20d 21' 11"}
SUN_DIST:         50.96 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      165.86d {+11h 03m 26s}   +0.99d {+00d 59' 22"}
MOON_DIST:       156.41 [deg]
MOON_ILLUM:      64 [%]
GAL_COORDS:      113.23,-53.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.12,  5.88 [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 22 May 10 04:05:44 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     422783,   Seg_Num: 0
POINT_RA:          6.960d {+00h 27m 50s} (J2000)
POINT_DEC:        +9.409d {+09d 24' 32"} (J2000)
ROLL:            71.367d
IMG_START_DATE:  15338 TJD;   142 DOY;   10/05/22
IMG_START_TIME:  13838.11 SOD {03:50:38.11} UT,   285.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     296193043
X_OFFSET:        982 [pixels]
Y_OFFSET:        894 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1142
Y_GRB_POS:       1054
BINNING_INDEX:   1
IM_URL:          sw00422783000msuni0291.fits
SUN_POSTN:        58.84d {+03h 55m 21s}  +20.35d {+20d 21' 11"}
SUN_DIST:         50.96 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      165.86d {+11h 03m 26s}   +0.99d {+00d 59' 20"}
MOON_DIST:       156.41 [deg]
MOON_ILLUM:      64 [%]
GAL_COORDS:      113.23,-53.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.12,  5.88 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 22 May 10 04:06:24 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     422783,   Seg_Num: 0
GRB_RA:            6.9866d {+00h 27m 56.78s} (J2000),
                   7.1209d {+00h 28m 29.00s} (current),
                   6.3408d {+00h 25m 21.79s} (1950)
GRB_DEC:          +9.4023d {+09d 24' 08.2"} (J2000),
                  +9.4597d {+09d 27' 34.8"} (current),
                  +9.1258d {+09d 07' 32.7"} (1950)
GRB_ERROR:       2.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15338 TJD;   142 DOY;   10/05/22
IMG_START_TIME:  13712.00 SOD {03:48:32.00} UT,   159.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        58.84d {+03h 55m 21s}  +20.35d {+20d 21' 11"}
SUN_DIST:         50.94 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      165.86d {+11h 03m 27s}   +0.99d {+00d 59' 11"}
MOON_DIST:       156.39 [deg]
MOON_ILLUM:      64 [%]
GAL_COORDS:      113.27,-53.03 [deg] galactic lon,lat of the burst
ECL_COORDS:       10.14,  5.86 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 1.1% < P(seren) < 2.8%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 22 May 10 04:11:01 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     422783,   Seg_Num: 0
POINT_RA:          6.960d {+00h 27m 50s} (J2000)
POINT_DEC:        +9.409d {+09d 24' 32"} (J2000)
POINT_ROLL:      71.367d
IMG_START_DATE:  15338 TJD;   142 DOY;   10/05/22
IMG_START_TIME:  14414.51 SOD {04:00:14.51} UT,   862.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.476
N_STARS:         121
X_OFFSET:        422 [pixels]
Y_OFFSET:        334 [pixels]
X_MAX:           1861 [pixels]
Y_MAX:           1773 [pixels]
DET_THRESH:      24
PHOTO_THRESH:    15
SL_URL:          sw00422783000msufc0862.fits
SUN_POSTN:        58.84d {+03h 55m 22s}  +20.35d {+20d 21' 14"}
SUN_DIST:         50.97 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      165.90d {+11h 03m 37s}   +0.97d {+00d 58' 02"}
MOON_DIST:       156.46 [deg]
MOON_ILLUM:      64 [%]
GAL_COORDS:      113.23,-53.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.12,  5.88 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 22 May 10 04:11:20 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     422783,   Seg_Num: 0
POINT_RA:          6.960d {+00h 27m 50s} (J2000)
POINT_DEC:        +9.409d {+09d 24' 32"} (J2000)
POINT_ROLL:      71.367d
IMG_START_DATE:  15338 TJD;   142 DOY;   10/05/22
IMG_START_TIME:  14414.51 SOD {04:00:14.51} UT,   862.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.476
N_STARS:         121
X_OFFSET:        422 [pixels]
Y_OFFSET:        334 [pixels]
X_MAX:           1861 [pixels]
Y_MAX:           1773 [pixels]
DET_THRESH:      24
PHOTO_THRESH:    15
SL_URL:          sw00422783000msufc0862.fits
SUN_POSTN:        58.84d {+03h 55m 22s}  +20.35d {+20d 21' 14"}
SUN_DIST:         50.97 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      165.91d {+11h 03m 38s}   +0.97d {+00d 57' 57"}
MOON_DIST:       156.46 [deg]
MOON_ILLUM:      64 [%]
GAL_COORDS:      113.23,-53.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.12,  5.88 [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 22 May 10 04:12:21 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     422783,   Seg_Num: 0
POINT_RA:          6.960d {+00h 27m 50s} (J2000)
POINT_DEC:        +9.409d {+09d 24' 32"} (J2000)
ROLL:            71.367d
IMG_START_DATE:  15338 TJD;   142 DOY;   10/05/22
IMG_START_TIME:  14414.51 SOD {04:00:14.51} UT,   862.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     296193620
X_OFFSET:        981 [pixels]
Y_OFFSET:        893 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1141
Y_GRB_POS:       1053
BINNING_INDEX:   1
IM_URL:          sw00422783000msuni0868.fits
SUN_POSTN:        58.84d {+03h 55m 22s}  +20.35d {+20d 21' 14"}
SUN_DIST:         50.97 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      165.92d {+11h 03m 40s}   +0.96d {+00d 57' 42"}
MOON_DIST:       156.47 [deg]
MOON_ILLUM:      64 [%]
GAL_COORDS:      113.23,-53.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.12,  5.88 [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 22 May 10 04:12:30 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     422783,   Seg_Num: 0
POINT_RA:          6.960d {+00h 27m 50s} (J2000)
POINT_DEC:        +9.409d {+09d 24' 32"} (J2000)
ROLL:            71.367d
IMG_START_DATE:  15338 TJD;   142 DOY;   10/05/22
IMG_START_TIME:  14414.51 SOD {04:00:14.51} UT,   862.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     296193620
X_OFFSET:        981 [pixels]
Y_OFFSET:        893 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1141
Y_GRB_POS:       1053
BINNING_INDEX:   1
IM_URL:          sw00422783000msuni0868.fits
SUN_POSTN:        58.84d {+03h 55m 22s}  +20.35d {+20d 21' 14"}
SUN_DIST:         50.97 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      165.92d {+11h 03m 40s}   +0.96d {+00d 57' 39"}
MOON_DIST:       156.48 [deg]
MOON_ILLUM:      64 [%]
GAL_COORDS:      113.23,-53.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.12,  5.88 [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 22 May 10 04:11:01 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     422783,   Seg_Num: 0
POINT_RA:          6.960d {+00h 27m 50s} (J2000)
POINT_DEC:        +9.409d {+09d 24' 32"} (J2000)
POINT_ROLL:      71.367d
IMG_START_DATE:  15338 TJD;   142 DOY;   10/05/22
IMG_START_TIME:  14414.51 SOD {04:00:14.51} UT,   862.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.476
N_STARS:         121
X_OFFSET:        422 [pixels]
Y_OFFSET:        334 [pixels]
X_MAX:           1861 [pixels]
Y_MAX:           1773 [pixels]
DET_THRESH:      24
PHOTO_THRESH:    15
SL_URL:          sw00422783000msufc0862.fits
SUN_POSTN:        58.84d {+03h 55m 22s}  +20.35d {+20d 21' 14"}
SUN_DIST:         50.97 [deg]   Sun_angle= 3.4 [hr] (West of Sun)
MOON_POSTN:      165.90d {+11h 03m 37s}   +0.97d {+00d 58' 02"}
MOON_DIST:       156.46 [deg]
MOON_ILLUM:      64 [%]
GAL_COORDS:      113.23,-53.02 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       10.12,  5.88 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 22 May 10 05:23:18 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     296192754
GRB_RA:           13.080d {+00h 52m 19s} (J2000),
                  13.216d {+00h 52m 52s} (current),
                  12.427d {+00h 49m 43s} (1950)
GRB_DEC:         +11.440d {+11d 26' 24"} (J2000),
                 +11.496d {+11d 29' 47"} (current),
                 +11.168d {+11d 10' 06"} (1950)
GRB_ERROR:       3.62 [deg radius, statistical only]
DATA_SIGNIF:     31.30 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        15338 TJD;   142 DOY;   10/05/22
GRB_TIME:        13552.29 SOD {03:45:52.29} UT
GRB_PHI:           5.00 [deg]
GRB_THETA:        88.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:        58.89d {+03h 55m 34s}  +20.36d {+20d 21' 49"}
SUN_DIST:         44.66 [deg]   Sun_angle= 3.0 [hr] (West of Sun)
MOON_POSTN:      166.55d {+11h 06m 11s}   +0.67d {+00d 40' 01"}
MOON_DIST:       150.85 [deg]
MOON_ILLUM:      64 [%]
GAL_COORDS:      123.28,-51.43 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       16.48,  5.38 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN Circular #10784
E. Troja (NASA/GSFC/ORAU), A. P. Beardmore (U Leicester), M. M. Chester (PSU), J. M. Gelbord (PSU), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), C. Pagani (U Leicester), D. M. Palmer (LANL), R. L. C. Starling (U Leicester), T. N. Ukwatta (GSFC/GWU) and L. Vetere (PSU) report on behalf of the Swift Team:
At 03:45:52 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 100522A (trigger=422783). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 6.983, +9.417 which is
```
   RA(J2000) = 00h 27m 56s
   Dec(J2000) = +09d 25' 03"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a first pair of peaks near T0 with a duration of about 5 sec and a second fainter and softer pair of peaks near T+30 s. The peak count rate was ~15,000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 03:46:57.7 UT, 65.4 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source with an enhanced position: RA, Dec 6.9867, 9.4023 which is equivalent to:
```
   RA(J2000)  = 00h 27m 56.82s
   Dec(J2000) = +09d 24' 08.1"
```
with an uncertainty of 2.2 arcseconds (radius, 90% containment). This location is 54 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 (3.98e+20 cm^-2, Kalberla et al. 2005), with an excess column of 2.7 (+2.46/-2.10) x 10^21 cm^-2 (90% confidence).
The initial flux in the 2.5 s image was 2.40e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 73 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The 3-sigma upper limit at the XRT position is 18.5 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.06.
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/too.html.)
GCN Circular #10785
M. Jel=EDnek (IAA-CSIC Granada), P. Kub=E1nek (IPL Valencia, IAA-CSIC) and A. J. Castro-Tirado (IAA-CSIC), on behalf of a larger collaboration,
report:
"The 0.6m TELMA robotic telescope at the BOOTES-2 astronomical station in M=E1laga (Spain) reacted to the Swift GRB 100522A (Troja et al., GCNC10784), starting 10m25s after the trigger (15s after receiving the delayed trigger). A set of 10s unfiltered images was obtained, however the progressing twillight degraded the images (already taken at high airmass). The 120s coadded image with an exposure mean time 735s after the GRB provides a limit R>15.5 at the XRT position reported by Troja et al."
This message can be quoted.
GCN Circular #10786
A. de Ugarte Postigo (OAB-INAF), A.J. Castro-Tirado (IAA-CSIC), A. Guijarro and M. Alises (CAHA) report on behalf of a larger collaboration:
"We have observed the field of GRB 100522A (Troja et al. GCNC 10784) with the 3.5m CAHA telescope (+Omega2000) in J and Ks bands. The observations were obtained during twilight, with a very high background. In a preliminary analysis we do not detect any source within the XRT error circle in any of the images. The 3x60s combined J-band exposure, has a mean time 04:20:27 UT and a 3-sigma limiting magnitude of 17.9. The 4x60s combined K-band exposure has a mean time of 04:31:50 and a limiting magnitude of 16.3."
GCN Circular #10787
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 3778 s of XRT Photon Counting mode data and 6 UVOT images for GRB 100522A, 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 = 6.98662, +9.40184 which is equivalent to:
```
RA (J2000): 00h 27m 56.79s
Dec (J2000): +09d 24' 06.6"
```
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, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #10788
S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC/UMD), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), E. Troja (NASA/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 100522A (trigger #422783) (Troja, et al., GCN Circ. 10784). The BAT ground-calculated position is RA, Dec = 6.990, +9.397 deg which is
```
   RA(J2000)  =  00h 27m 57.6s
   Dec(J2000) = +09d 23' 50.1"
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 71%.
The mask-weighted light curve shows a complex structure. There are two main episodes of emission, starting at T-0.5 sec and T+25 sec, respectively. The first episode starts with a broad multi-peaked structure 2.5 sec long followed by three short (~0.3 sec long) peaks. Then the emission returns to background levels before rising in a second, less intense and softer two peak structure approximately 15 sec long. T90 (15-350 keV) is 35.3 +- 1.8 sec (estimated error including systematics).
The time-averaged spectrum from T-0.5 to T+40.2 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.89 +- 0.08. The fluence in the 15-150 keV band is 2.1 +- 0.1 x 10-6 erg/cm2. The 1-sec peak photon flux measured from T+0.04 sec in the 15-150 keV band is 7.1 +- 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/422783/BA/
GCN Circular #10789
R.L.C. Starling, A.P. Beardmore (U. Leicester) and E. Troja (NASA/GSFC/ORAU) report on behalf of the Swift-XRT team:
We have analysed 5.4 ks of XRT data for GRB 100522A (Troja et al. GCN Circ. 10784), from 56 s to 13.6 ks after the BAT trigger. The data comprise 87 s in Windowed Timing (WT) mode (the first 7 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN. Circ 10787).
The light curve can be modelled with a series of power-law decays. The initial decay index is alpha = 4.8 (+/-0.4). At T+130 s the decay flattens to an alpha of 0.53 (+0.04, -0.09) before breaking again at T+7830 s to a final decay with index alpha = 1.2 (+2.8, -0.4).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of Gamma = 2.82 (+0.32, -0.28). The best-fitting absorption column is 4.0 (+0.8, -0.7) x 10^21 cm^-2, in excess of the Galactic value of 4.0 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 2.14 (+0.30, -0.28) and a best-fitting absorption column of 4.0 (+1.2, -1.0) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.4 x 10^-11 (8.1 x 10^-11) erg cm^-2 count^-1.
If the light curve continues to decay with a power-law decay index of 1.2, the count rate at T+24 hours will be 0.011 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 4.8 x 10^-13 (8.9 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00422783.
This circular is an official product of the Swift-XRT team.
GCN Circular #10790
S. McBreen (UCD/MPE) reports on behalf of the Fermi GBM Team:
"At 03:45:52.29 UT on 22 May 2010, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 100522A (trigger 296192754 / 100522157) which was also detected by the Swift-BAT (Troja et al. 2010, GCN 10784). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 81 degrees.
The GBM light curve consists of two of pulses with substructure from T0 to T0+5 s followed by two softer pulses lasting from T0+25 s to about T0+40 sec. The burst has a duration (T90) of about 35.0 +/-1.5 s (50-300 keV). The time-averaged spectrum from T0-0.003 s to T0+40.385 s is adequately fit by a simple power law function with index -1.81 (+/-0.03)(CSTAT 544 for 481 d.o.f.).
The event fluence (8-1000 keV) in this time interval is (5.2 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+0.25 s in the 8-1000 keV band is 11.0 +/- 0.3 ph/s/cm^2.
A power law function with an exponential high energy cutoff fits the spectrum equally well (CSTAT 538 for 480 d.o.f). The power law index is -1.62 (+0.10/-0.09) and the cutoff energy, parameterized as Epeak, is 138 (+82/-32) keV.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #10791
M. De Pasquale (MSS-UCL) and Eleonora Troja (NASA/GSFC/ORAU) report on behalf of the Swift/UVOT team:
Swift/UVOT began settled observations of GRB100522A (Troja et al. GCN Circ. 10784) starting 73 seconds after trigger. No optical afterglow within the enhanced XRT position (Osborne et al. GCN Circ. 10787) is detected in the UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for the first finding chart (FC) exposure and subsequent summed exposures are:
```
Filter   T_start(s)  T_stop(s)   Exp(s)   Mag
-----------------------------------------------------------
white       73         223         147      >20.1 (FC)
white       73        7223         569      >20.9
v          614        6199         352      >19.0
b          541        7018         352      >19.9
u          285       13630        1243      >20.1
uw1        663       12939        1242      >20.5
m2         639        7838         549      >20.2
w2         590        7429         363      >20.1
```
The values quoted above are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.06 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #10793
P. Afonso (MPE Garching), S. Klose (TLS Tautenburg), and J. Greiner (MPE Garching), report on behalf of the GROND team:
GROND (Greiner et al. 2008, PASP 120, 405), the 7-channel imager mounted at the 2.2m ESO/MPI telescope on La Silla, started follow-up observations of the Swift/Fermi burst GRB 100522A (Troja et al. 2010, GCN 10784; McBreen 2010, GCN 10790) on May 23 at 09:18 UT (about 29.5 hrs after the burst), and continued for about 1 hour.
Within the enhanced XRT 1.5 arcsec error circle reported by Osborne et al. (GCN 10787) we do not find any afterglow candidate. Based on 50 min of total exposures in g'r'i'z' and 40 min in JHK, preliminary measured upper limits are (in the AB system, 3 sigma):
```
g' > 24.8,
r' > 24.4,
i' > 23.6,
z' > 23.3,
J  > 21.7,
H  > 20.9,
K  > 20.6,
```
using GROND zeropoints and the 2MASS catalog.
GCN Circular #10795
A. Daikyuji, N. Ohmori, Y. Nishioka, M. Yamauchi (Univ. of Miyazaki), K. Yamaoka (Aoyama Gakuin U.), S. Sugita (Nagoya U.), Y. Hanabata, T. Uehara, T. Takahashi, Y. Fukazawa (Hiroshima U.), Y. Terada, M. Tashiro, W. Iwakiri, K. Takahara, T. Yasuda (Saitama U.), M. Ohno, M. Suzuki, M. Kokubun, T. Takahashi (ISAS/JAXA), Y. E. Nakagawa, T. Tamagawa (RIKEN), N. Vasquez (Tokyo Tech.), Y. Urata, H. M. Lin (NCU), T. Enoto, K. Nakazawa, K. Makishima (Univ. of Tokyo), S. Hong (Nihon U.), on behalf of the Suzaku WAM team, report:
The long GRB100522A (Swift/BAT trigger #422783 ; Troja et al., GCN 10784) was detected by the the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at 2010-05-22 03:45:52 UT (=T0).
The observed light curve shows a single peak starting at T0, ending at T0+4s with a duration (T90) of about 3 seconds. The WAM detected only the first bright peak observed by Swift/BAT (Barthelmy et al., GCN 10788) and Fermi/GBM(McBreen et al., GCN 10790). The fluence in 100 - 1000 keV was 1.39 (-0.18, +0.15) x10-6 erg/cm2. The 1-s peak flux measured from T0+1s was 1.50 (-0.27, +0.24) photons/cm2/s in the same energy range.
Preliminary result shows that the time-averaged spectrum from T0 to T0+4s is well fitted by a single power-law with a photon index of 2.26 (-0.18, +0.21) (chi2/d.o.f = 26.8/35).
All the quoted errors are at statistical 90% confidence level, in which the systematic uncertainties are not included.
The light curves with 1-sec time resolution for this burst will be appeared at:
http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/untrig/grb_table.html
GCN Circular #10796
S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, report:
The long GRB 100522A (Swift-BAT trigger=422783; Troja et al., GCN 10784; Barthelmy et al., GCN 10788) triggered Konus-Wind at T0=13549.843s UT (03:45:49.843)
The burst light curve shows a single pulse with a total duration of ~6 s. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB100522_T13549/
As observed by Konus-Wind the burst had a fluence of 1.7(-0.5, +0.3)x10-6 erg/cm2, and a 256-ms peak flux measured from T0-0.256s of 0.7(-0.2, +0.1)x10-6 erg/cm2/s (both in the 20 keV - 2 MeV energy range).
The time-integrated spectrum of the burst (from T0 to T0+8.848 s) is best fit in the 20 keV - 2 MeV range by a single power-law model with a photon index of 2.9 (-/+0.5), chi2 = 78/69 dof.
All the quoted results are preliminary. All the quoted errors are at the 90% confidence level.
GCN Report 286.1
GCN_Report 286.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_286_1.pdf by E. Troja at NASA/GSFC/ORAU titled: "Final report on Swift Observations of GRB 100522A"

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Jochen Greiner, last update: 22-May-2010 [Disclaimer]