Gamma-ray Burst 070223

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 23 Feb 07 01:22:48 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     261664,   Seg_Num: 0
GRB_RA:          153.452d {+10h 13m 49s} (J2000),
                 153.560d {+10h 14m 15s} (current),
                 152.693d {+10h 10m 46s} (1950)
GRB_DEC:         +43.121d {+43d 07' 16"} (J2000),
                 +43.086d {+43d 05' 08"} (current),
                 +43.369d {+43d 22' 10"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       14874 [cnts]    Image_Peak=336 [image_cnts]
TRIGGER_DUR:     3.072 [sec] 
TRIGGER_INDEX:   474     E_range: 25-100 keV
BKG_INTEN:       140062 [cnts]
BKG_TIME:        4454.21 SOD {01:14:14.21} UT
BKG_DUR:         32 [sec]
GRB_DATE:        14154 TJD;    54 DOY;   07/02/23
GRB_TIME:        4500.68 SOD {01:15:00.68} UT
GRB_PHI:         173.39 [deg]
GRB_THETA:        28.18 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     8.42 [sigma]
IMAGE_SIGNIF:    7.24 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +2  -1  +0  +0 +83  +1 
SUN_POSTN:       335.93d {+22h 23m 43s}  -10.03d {-10d 01' 37"}
SUN_DIST:        146.88 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       43.59d {+02h 54m 22s}  +21.42d {+21d 25' 24"}
MOON_DIST:        89.01 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      175.77, 54.45 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      138.82, 29.83 [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 = 16.74,-17.73 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 23 Feb 07 01:23:22 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     261664,   Seg_Num: 0
GRB_RA:          153.4533d {+10h 13m 48.7s} (J2000),
                 153.5615d {+10h 14m 14.7s} (current),
                 152.6942d {+10h 10m 46.5s} (1950)
GRB_DEC:         +43.1336d {+43d 08' 00.9"} (J2000),
                 +43.0980d {+43d 05' 52.7"} (current),
                 +43.3818d {+43d 22' 54.5"} (1950)
GRB_ERROR:       4.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       2.97e-09 [erg/cm2/sec]
GRB_SIGNIF:      9.05 [sigma]
IMG_START_DATE:  14154 TJD;    54 DOY;   07/02/23
IMG_START_TIME:  4610.91 SOD {01:16:50.91} UT,   110.2 [sec] since BAT Trigger Time
TAM[0-3]:        327.60 237.19 261.20 243.56
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       335.93d {+22h 23m 43s}  -10.03d {-10d 01' 36"}
SUN_DIST:        146.86 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       43.60d {+02h 54m 24s}  +21.43d {+21d 25' 31"}
MOON_DIST:        89.00 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      175.75, 54.45 [deg] galactic lon,lat of the burst
ECL_COORDS:      138.82, 29.84 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 23 Feb 07 01:23:23 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     261664,   Seg_Num: 0
GRB_RA:          153.4533d {+10h 13m 48.7s} (J2000),
                 153.5615d {+10h 14m 14.7s} (current),
                 152.6942d {+10h 10m 46.5s} (1950)
GRB_DEC:         +43.1336d {+43d 08' 00.9"} (J2000),
                 +43.0980d {+43d 05' 52.7"} (current),
                 +43.3818d {+43d 22' 54.5"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       82 [cnts]
IMG_START_DATE:  14154 TJD;    54 DOY;   07/02/23
IMG_START_TIME:  4610.91 SOD {01:16:50.91} UT,   110.2 [sec] since BAT Trigger Time
CENTROID_X:      316.60,  raw= 317  [pixels]
CENTROID_Y:      292.67,  raw= 293  [pixels]
ROLL:            355.51 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -12.54
GRB_POS_XRT_Z:   33.71
IMAGE_URL:       sw00261664000msxps_rw.img
SUN_POSTN:       335.93d {+22h 23m 43s}  -10.03d {-10d 01' 36"}
SUN_DIST:        146.86 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       43.60d {+02h 54m 24s}  +21.43d {+21d 25' 31"}
MOON_DIST:        89.00 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      175.75, 54.45 [deg] galactic lon,lat of the burst
ECL_COORDS:      138.82, 29.84 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 23 Feb 07 01:23:29 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     261664,   Seg_Num: 0
GRB_RA:          153.4533d {+10h 13m 48.7s} (J2000),
                 153.5615d {+10h 14m 14.7s} (current),
                 152.6942d {+10h 10m 46.5s} (1950)
GRB_DEC:         +43.1336d {+43d 08' 00.9"} (J2000),
                 +43.0980d {+43d 05' 52.7"} (current),
                 +43.3818d {+43d 22' 54.5"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       82 [cnts]
IMG_START_DATE:  14154 TJD;    54 DOY;   07/02/23
IMG_START_TIME:  4610.91 SOD {01:16:50.91} UT,   110.2 [sec] since BAT Trigger Time
CENTROID_X:      316.60,  raw= 317  [pixels]
CENTROID_Y:      292.67,  raw= 293  [pixels]
ROLL:            355.51 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -12.54
GRB_POS_XRT_Z:   33.71
IMAGE_URL:       sw00261664000msxps_rw.img
SUN_POSTN:       335.93d {+22h 23m 43s}  -10.03d {-10d 01' 36"}
SUN_DIST:        146.86 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       43.60d {+02h 54m 24s}  +21.43d {+21d 25' 32"}
MOON_DIST:        89.00 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      175.75, 54.45 [deg] galactic lon,lat of the burst
ECL_COORDS:      138.82, 29.84 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 23 Feb 07 01:24:14 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     261664,   Seg_Num: 0
GRB_RA:          153.452d {+10h 13m 49s} (J2000),
                 153.560d {+10h 14m 15s} (current),
                 152.693d {+10h 10m 46s} (1950)
GRB_DEC:         +43.121d {+43d 07' 16"} (J2000),
                 +43.086d {+43d 05' 08"} (current),
                 +43.369d {+43d 22' 10"} (1950)
GRB_DATE:        14154 TJD;    54 DOY;   07/02/23
GRB_TIME:        4500.68 SOD {01:15:00.68} UT
TRIGGER_INDEX:   474
GRB_PHI:         173.39 [deg]
GRB_THETA:        28.18 [deg]
DELTA_TIME:      -5.00 [sec]
TRIGGER_DUR:     3.072 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     8.42 [sigma]
IMAGE_SIGNIF:    7.24 [sigma]
LC_URL:          sw00261664000msb.lc
SUN_POSTN:       335.93d {+22h 23m 43s}  -10.03d {-10d 01' 36"}
SUN_DIST:        146.88 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       43.61d {+02h 54m 26s}  +21.43d {+21d 25' 41"}
MOON_DIST:        88.99 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      175.77, 54.45 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      138.82, 29.83 [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 = 16.74,-17.73 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 23 Feb 07 01:24:28 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     261664,   Seg_Num: 0
POINT_RA:        153.447d {+10h 13m 47s} (J2000)
POINT_DEC:       +43.143d {+43d 08' 34"} (J2000)
POINT_ROLL:      355.510d
IMG_START_DATE:  14154 TJD;    54 DOY;   07/02/23
IMG_START_TIME:  4619.48 SOD {01:16:59.48} UT,   118.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.424
N_STARS:         22
X_OFFSET:        344 [pixels]
Y_OFFSET:        624 [pixels]
X_MAX:           1303 [pixels]
Y_MAX:           1583 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00261664000msufc0118.fits
SUN_POSTN:       335.93d {+22h 23m 43s}  -10.03d {-10d 01' 35"}
SUN_DIST:        146.85 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       43.61d {+02h 54m 26s}  +21.43d {+21d 25' 44"}
MOON_DIST:        88.98 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      175.74, 54.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.81, 29.84 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 23 Feb 07 01:24:55 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     261664,   Seg_Num: 0
POINT_RA:        153.447d {+10h 13m 47s} (J2000)
POINT_DEC:       +43.143d {+43d 08' 34"} (J2000)
POINT_ROLL:      355.510d
IMG_START_DATE:  14154 TJD;    54 DOY;   07/02/23
IMG_START_TIME:  4619.48 SOD {01:16:59.48} UT,   118.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.424
N_STARS:         22
X_OFFSET:        344 [pixels]
Y_OFFSET:        624 [pixels]
X_MAX:           1303 [pixels]
Y_MAX:           1583 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00261664000msufc0118.fits
SUN_POSTN:       335.93d {+22h 23m 43s}  -10.03d {-10d 01' 35"}
SUN_DIST:        146.85 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       43.61d {+02h 54m 27s}  +21.43d {+21d 25' 49"}
MOON_DIST:        88.97 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      175.74, 54.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.81, 29.84 [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:     Fri 23 Feb 07 01:25:25 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     261664,   Seg_Num: 0
POINT_RA:        153.447d {+10h 13m 47s} (J2000)
POINT_DEC:       +43.143d {+43d 08' 34"} (J2000)
ROLL:            355.510d
IMG_START_DATE:  14154 TJD;    54 DOY;   07/02/23
IMG_START_TIME:  4619.48 SOD {01:16:59.48} UT,   118.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     193886221
X_OFFSET:        746 [pixels]
Y_OFFSET:        918 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       906
Y_GRB_POS:       1078
BINNING_INDEX:   1
IM_URL:          sw00261664000msuni0118.fits
SUN_POSTN:       335.93d {+22h 23m 43s}  -10.03d {-10d 01' 35"}
SUN_DIST:        146.85 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       43.62d {+02h 54m 28s}  +21.43d {+21d 25' 55"}
MOON_DIST:        88.97 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      175.74, 54.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.81, 29.84 [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:     Fri 23 Feb 07 01:25:43 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     261664,   Seg_Num: 0
POINT_RA:        153.447d {+10h 13m 47s} (J2000)
POINT_DEC:       +43.143d {+43d 08' 34"} (J2000)
ROLL:            355.510d
IMG_START_DATE:  14154 TJD;    54 DOY;   07/02/23
IMG_START_TIME:  4619.48 SOD {01:16:59.48} UT,   118.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     193886221
X_OFFSET:        746 [pixels]
Y_OFFSET:        918 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       906
Y_GRB_POS:       1078
BINNING_INDEX:   1
IM_URL:          sw00261664000msuni0118.fits
SUN_POSTN:       335.93d {+22h 23m 43s}  -10.03d {-10d 01' 34"}
SUN_DIST:        146.85 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       43.62d {+02h 54m 29s}  +21.43d {+21d 25' 59"}
MOON_DIST:        88.97 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      175.74, 54.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.81, 29.84 [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:     Fri 23 Feb 07 01:25:53 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     261664,   Seg_Num: 0
POINT_RA:        153.450d {+10h 13m 48s} (J2000)
POINT_DEC:       +43.142d {+43d 08' 33"} (J2000)
POINT_ROLL:      355.513d
IMG_START_DATE:  14154 TJD;    54 DOY;   07/02/23
IMG_START_TIME:  4724.79 SOD {01:18:44.79} UT,   224.1 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        0.238
N_STARS:         11
X_OFFSET:        426 [pixels]
Y_OFFSET:        598 [pixels]
X_MAX:           1385 [pixels]
Y_MAX:           1557 [pixels]
DET_THRESH:      5
PHOTO_THRESH:    2
SL_URL:          sw00261664000msufc0224.fits
SUN_POSTN:       335.93d {+22h 23m 43s}  -10.03d {-10d 01' 34"}
SUN_DIST:        146.85 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       43.62d {+02h 54m 30s}  +21.43d {+21d 26' 01"}
MOON_DIST:        88.97 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      175.74, 54.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.81, 29.84 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 23 Feb 07 01:27:14 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     261664,   Seg_Num: 0
POINT_RA:        153.450d {+10h 13m 48s} (J2000)
POINT_DEC:       +43.142d {+43d 08' 33"} (J2000)
ROLL:            355.513d
IMG_START_DATE:  14154 TJD;    54 DOY;   07/02/23
IMG_START_TIME:  4724.79 SOD {01:18:44.79} UT,   224.1 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     193886326
X_OFFSET:        746 [pixels]
Y_OFFSET:        918 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       906
Y_GRB_POS:       1078
BINNING_INDEX:   1
IM_URL:          sw00261664000msuni0224.fits
SUN_POSTN:       335.93d {+22h 23m 44s}  -10.03d {-10d 01' 33"}
SUN_DIST:        146.85 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       43.64d {+02h 54m 33s}  +21.44d {+21d 26' 17"}
MOON_DIST:        88.96 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      175.74, 54.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.81, 29.84 [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:     Fri 23 Feb 07 01:26:19 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     261664,   Seg_Num: 0
POINT_RA:        153.450d {+10h 13m 48s} (J2000)
POINT_DEC:       +43.142d {+43d 08' 33"} (J2000)
POINT_ROLL:      355.513d
IMG_START_DATE:  14154 TJD;    54 DOY;   07/02/23
IMG_START_TIME:  4724.79 SOD {01:18:44.79} UT,   224.1 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        0.238
N_STARS:         11
X_OFFSET:        426 [pixels]
Y_OFFSET:        598 [pixels]
X_MAX:           1385 [pixels]
Y_MAX:           1557 [pixels]
DET_THRESH:      5
PHOTO_THRESH:    2
SL_URL:          sw00261664000msufc0224.fits
SUN_POSTN:       335.93d {+22h 23m 44s}  -10.03d {-10d 01' 34"}
SUN_DIST:        146.85 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       43.63d {+02h 54m 31s}  +21.43d {+21d 26' 06"}
MOON_DIST:        88.96 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      175.74, 54.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.81, 29.84 [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:     Fri 23 Feb 07 01:26:53 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     261664,   Seg_Num: 0
POINT_RA:        153.450d {+10h 13m 48s} (J2000)
POINT_DEC:       +43.142d {+43d 08' 33"} (J2000)
ROLL:            355.513d
IMG_START_DATE:  14154 TJD;    54 DOY;   07/02/23
IMG_START_TIME:  4724.79 SOD {01:18:44.79} UT,   224.1 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     193886326
X_OFFSET:        746 [pixels]
Y_OFFSET:        918 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       906
Y_GRB_POS:       1078
BINNING_INDEX:   1
IM_URL:          sw00261664000msuni0224.fits
SUN_POSTN:       335.93d {+22h 23m 44s}  -10.03d {-10d 01' 33"}
SUN_DIST:        146.85 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       43.63d {+02h 54m 32s}  +21.44d {+21d 26' 13"}
MOON_DIST:        88.96 [deg]
MOON_ILLUM:      36 [%]
GAL_COORDS:      175.74, 54.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.81, 29.84 [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 Circular #6125
L. Vetere (PSU), S. D. Barthelmy (GSFC), D. N. Burrows (PSU), S. Campana (INAF-OAB), M. M. Chester (PSU), N. Gehrels (NASA/GSFC), D. Grupe (PSU), J. A. Kennea (PSU), W. B. Landsman (NASA/GSFC), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), M. Stamatikos (NASA/ORAU) and E. Troja (INAF-IASFPA) report on behalf of the Swift Team:
At 01:15:00 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 070223 (trigger=261664). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 153.452, +43.121 which is
```
   RA(J2000)  =  10h 13m 49s
   Dec(J2000) = +43d 07' 16"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows several peaks with a duration of about 50 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 01:16:50 UT, 110 seconds after the BAT trigger. XRT found a bright, fading, uncatalogued X-ray source located at RA, Dec 153.4533, +43.1336 which is
```
   RA(J2000)  =  10h 13m 48.7s
   Dec(J2000) =  43d 08' 00.9"
```
with an uncertainty of 4.7 arcseconds (radius, 90% containment). This location is 45 arcseconds from the BAT on-board position, within the BAT error circle. The initial flux in the 2.5s image was 3.0e-09 erg/cm2/s (0.2-10 keV).
UVOT took a finding chart exposure of nominal 100 seconds with the White (160-650 nm) filter starting 120 seconds after the BAT trigger, and a finding chart in V starting 226 seconds after the trigger. No afterglow candidate has been found in the initial data products. Image catalog data are not available at this time. The 2.7'x2.7' immediately available image covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.01.
GCN Circular #6126
N. Mirabal and J. P. Halpern (Columbia U.) report on behalf of the MDM Observatory GRB follow-up team:
"We have observed the Swift location of GRB 070223 (Vetere et al., GCN 6125) with the MDM 1.3m telescope at a mean epoch Feb. 23, 02:18 UT (~1 hr post-burst). Inside the XRT error circle, we find no new optical sources to preliminary limiting magnitudes R > 20.3, I > 20.0. Observations are ongoing.
This message may be cited."
GCN Circular #6127
A. Melandri (Liverpool JMU) on behalf of the Liverpool GRB group report
The 2-m Liverpool Telescope robotically followed up GRB070223 (Vetere et al., GCN 6125, trigger=261664) beginning ~18 minutes after the GRB trigger time (UT:01:15:00).
We detect a very faint object inside the XRT position (Vetere et al., GCN 6125) not present in the USNO B1 catalog at this position
```
RA = 10:13:48.73
Dec = +43:08:00.54
```
with an uncertainty of 0.5 arcsec. In a coadded frames (with a total integration time of 780 sec) the object has a magnitude R~23 +/- 0.3 (with respect the USNO B1) between 18 and 51 minutes after the burst.
At the moment it is not possible to state if the object is fading.
Further analysis and observations are ongoing.
GCN Circular #6128
Richard J. Cool (Arizona), Daniel J. Eisenstein (Arizona), David W. Hogg (NYU), Michael R. Blanton (NYU), David J. Schlegel (LBNL), J. Brinkmann (APO), Donald Q. Lamb (Chicago), Donald P. Schneider (PSU), and Daniel E. Vanden Berk (PSU) report:
The Sloan Digital Sky Survey (SDSS) imaged the field of burst GRB070223 prior to the burst. As these data should be useful as a pre-burst comparison and for calibrating photometry, we are supplying the images and photometry measurements for this GRB field to the community.
Data from the SDSS, including 5 FITS images, 3 JPGS, and 3 files of photometry and astrometry, are being placed at http://mizar.as.arizona.edu/~grb/public/GRB070223
We supply FITS images in each of the 5 SDSS bands of a 8'x8' region centered on the GRB position (ra=153.452 (10:13:48.5), dec=43.1210 (43:07:15.6); GCN 6125), as well as 3 gri color-composite JPGs (with different stretches). The units in the FITS images are nanomaggies per pixel. A pixel is 0.396 arcsec on a side. A nanomaggie is a flux-density unit equal to 10^-9 of a magnitude 0 source or, to the extent that SDSS is an AB system, 3.631e-6 Jy. The FITS images have WCS astrometric information.
In the file GRB070223_sdss.calstar.dat, we report photometry and astrometry of 308 bright stars (r<20.5) within 15' of the burst location. The magnitudes presented in this file are asinh magnitudes as are standard in the SDSS (Lupton 1999, AJ, 118, 1406). Beware that some of these stars are not well- detected in the u-band; use the errors and object flags to monitor data quality.
In the files GRB070223_sdss.objects_flux.dat and GRB070223_sdss.objects_magnitudes.dat, we report photometry of 1529 objects detected within 6' of the GRB position. We have removed saturated objects and objects with model magnitudes fainter than 23.0 in the r- band. The fluxes listed in GRB070223_sdss.objects_flux.dat are in nanomaggies while the magnitudes listed in GRB070223_sdss.objects_magnitudes.dat are asinh magnitudes.
All quantities reported are standard SDSS photometry, meaning that they are very close to AB zeropoints and magnitudes are quoted in asinh magnitudes. Photometric zeropoints are known to about 2% rms. None of the photometry is corrected for dust extinction. The Schlegel, Finkbeiner, and Davis (1998) predictions for this region are A_U=0.078 mag, A_g=0.057 mag, A_r = 0.042 mag, A_i=0.032 mag, and A_z=0.022 mag.
The file GRB070223_sdss.spectro.dat contains a list of the 2 objects with SDSS spectroscopy within 6 arcminutes of the GRB position. In addition to the redshift and 1-sigma error for each object, this file also lists the object spectroscopic classification.
SDSS astrometry is generally better than 0.1 arcsecond per coordinate. Users requiring high precision astrometry should take note that the SDSS astrometric system can differ from other systems such as those used in other notices; we have not checked the offsets in this region.
More detailed information pertaining to our SDSS GRB releases can be found in our initial data release paper (Cool et al. 2006, PASP 118, 733). See the SDSS DR4 documentation for more details: http://www.sdss.org/dr5
These data have been reduced using a slightly different pipeline than that used for SDSS public data releases. We cannot guarantee that the values here will exactly match those in the data release in which these data are included. In particular, we expect the photometric calibrations to differ by of order 0.01 mag.
This note may be cited, but please also cite the SDSS data release paper, Adelman-McCarthy et al. (2006, ApJS, 162, 38), when using the data or referring to the technical documentation.
GCN Circular #6130
L. Vetere (PSU) reports on behalf of the Swift-XRT team:
We have analysed the first four orbits (up to 16.5 ks after the BAT trigger) of Swift XRT data for GRB 070223 (Vetere et al., GCN 6126). Using ~2.8 ks of Photon Counting (PC) mode data we find the following refined position:
```
RA (J2000)  =  10h 13m 48.4s
Dec(J2000)  = +43d 07' 58.2"
```
with an error radius of 4.5 arcseconds (90% confidence). This is 4.4 arcsec away from XRT initial position and 4.1 arcsec from the possible optical candidate reported by A. Melandri (GCN 6127).
The WT lightcurve shows a rapid decay with a slope of alpha~2.3 while the PC light curve shows a possible flattening (~0.6) but we still need more data to confirm it.
The WT mode spectrum can be fitted with a single power law of photon index of 1.7 +/- 0.1 and column density of (4.5 +/-0.1 )e21 cm**-2. We note the Galactic column density in the direction of the source is 1.1e20 cm**-2. The 0.3-10 keV observed flux was 6.5e-10 ergs cm**-2 s**-1, which corresponds to an unabsorbed flux of 9.2e-10 ergs cm**-2 s**-1.
This circular is an official product of the Swift-XRT team.
GCN Circular #6131
V. Lipunov, V.Kornilov, N.Shatskiy, E.Gorbovskoy, A.Belinski, D.Kuvshinov, N.Tyurina, P.Gritsyk Sternberg Astronomical Institute, Moscow Union 'Optic'
A. Tlatov, I.Golubov Kislovodsk Solar Station of the Pulkovo observatory
MASTER Very Wide Field Camera located at Kislovodsk Solar Station (http://observ.pereplet.ru, D=70 mm, 420 square degrees, 11 Mpixel's CCD) has moved to the Swift-BAT trigger 261664 and it has taken a series of 5s exposures starting 1 s after notice arrivel time at 01:23:11.719 UT under good weather condition and yang moon.
We note that the GBR position (L. Vetere et al. GCN Circ No. 6125) was at 5 degrees outside of the our field of view.
We note that the VWF camera continuously takes frames during the night.
These unfiltered images are calibrated relative to USNO A2.0 (R). There is no OT was found inside Swift error box.
```
T-Tgrb     Mean Time     Limit   Coadd?           Note

491s        493.5s       11.0     no       slightly moving

496s        498.5s       11.5     no

496s         521 s       12.5     10

496s         586 s       13.0     36
```
The message can be cited.
mailto: lipunov@sai.msu.ru
GCN Circular #6132
G. Sato (GSFC/ISAS), L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), L. Vetere (PSU) on behalf of the Swift-BAT team:
Using the data set from T-240 to T+963 sec from recent telemetry downlinks, we report further analysis of BAT GRB 070223 (trigger #261664) (Vetere, et al., GCN Circ. 6125). The BAT ground-calculated position is RA, Dec = 153.453, 43.132 deg which is
```
   RA(J2000)  = 10h 13m 48.6s 
   Dec(J2000) = 43d 07' 55.4" 
```
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 82%.
The mask-weighted lightcurve starts at ~T-20 sec and then rises to two main peaks at T+15 and T+35 sec with a long decaying profile out to T+150 sec. T90 (15-350 keV) is 89 +- 2 sec (estimated error including systematics).
The time-averaged spectrum from T-3.4 to T+98.5 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.87 +- 0.12. The fluence in the 15-150 keV band is 1.7 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+34.35 sec in the 15-150 keV band is 0.7 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The initial series of GCN Notices were delayed by ~460 sec because the trigger occurred during a Malindi telemetry downlink pass when the TDRSS messages are buffered on-board until the transmitter becomes available.
GCN Circular #6133
M. Uemura, A. Arai, and T. Uehara (Hiroshima Univ.), report on behalf of the KANATA GRB team:
We took optical and IR images of the field of GRB070223 (GCN 6125) at 12:31-12:52 UT 23 Feb. using TRISPEC attached to the KANATA 1.5-m telescope at Higashi-Hiroshima Observatory, Japan. We obtained 10 sets of V, J, and Ks-band images with a 123, 120, and 96-s exposure time, respectively. The images were calibrated with neighbor stars in the USNO A2.0 and 2MASS catalog.
We cannot significantly detect the optical and IR afterglows. at the position of the X-ray afterglow reported in GCN 6130. The limit magnitudes are below:
```
UT                      Limit mag     Exp. Time
Feb. 23.52863            V  > 21.3    123 * 10
Feb. 23.52858            J  > 18.7    120 * 10
Feb. 23.52843            Ks > 16.3     96 * 10
```
GCN Report 35.1
GCN_Report 35.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_35_1.pdf by L. Vetere at PSU titled: "Swift Observations on GRB 070223"
GCN Circular #6134
W. Landsman(NASA/GSFC), L. Angelini(GSFC/JHU) and J. Greiner(MPE) report on behalf of the Swift UVOT team:
The Swift/UVOT observed the field of GRB 070223 starting 102s after the BAT trigger (Vertere et al. 2007, GCN Circ. 6125) with the settling exposure.
We do not find any source, in any of the UVOT observations, inside of the refined XRT error circle (Vertere et al. 2007, GCN Circ. 6130).
We have the following 3-sigma upper limits for a source inside the XRT error circle in the first exposure with the White filter, and in the coadded frames with all filters:
```
Filter  T_Start    T_End   Exp (s)   3sigma U.L. mag

White   120         219      98         20.2

V       102         295      79         18.9
B      5893        6084     189         20.6
U      5688       16398     351         20.5
UVW1   3863       16234    1069         21.2
UVM2   3658        3858     197         20.1
White   120       11872    1002         21.4
```
No correction has been made for the small extinction corresponding to E(B-V) = 0.015 (Schlegel et al. 1998).
GCN Circular #6136
A. C. Gupta National Astronomical Observatories/Yunnan Observatory CAS, P.O. Box 110, Kunming, Yunnan 650011, China
We observed the field of GRB 070223 (GCN 6125) with CCD detector at our 1.02 meter telescope of the Yunnan observatory, Kunming, China. We started our observation on Feb. 23, 2006 at UT 13:21:20. We took 5 image frames of 200 seconds exposure time of each in the optical R passband. There is no detection of optical afterglow candidate in our combined 5 images. The 5-sigma limiting magnitude of our observations is R ~ 20.0 mag.
GCN Circular #6150
Poonam Chandra (NRAO/UVA) and Dale A. Frail (NRAO) report on behalf of the Caltech-NRAO-Carnegie GRB Collaboration:
"We used the Very Large Array to observe the field of view toward GRB 070223 (GCN 6125) at a frequency of 8.46 GHz on 2007 February 25 at 4.93 UT. The GRB is undetected and the peak radio brightness at the Liverpool Telescope Possible Afterglow Candidate position (GCN 6127) is 41+/-56 uJy and at SWIFT-XRT position (GCN 6130) is 77+/-57 uJy.
The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc."
GCN Circular #6162
N. Mirabal (Columbia U.), A. Melandri (Liverpool JMU), and J. P. Halpern (Columbia U.) report
"We have further analyzed deep R-band images of Swift GRB 070223 (Vetere et al., GCN 6125) obtained with the 2-m Liverpool Telescope (Melandri, GCN 6127) and the MDM 1.3m telescope (Mirabal & Halpern, GCN 6126) on Feb. 23.025 and Feb. 23.272, respectively. The afterglow candidate reported by Melandri (GCN 6127) is not detected in our coadded frames. We therefore consider it unlikely that this is the OT of GRB 070223.
In both sets of images, we find a faint object located at:
```
RA(J2000) = 10h 13m 48.19s
Dec(J2000) = +43d 07' 54.65 ''
```
with a preliminary magnitude of R~23.7, which is consistent with the XRT position (Vetere, GCN 6130). We have not established any optical variability at this time."
GCN Circular #6168
A.J. Castro-Tirado, A. de Ugarte Postigo, M. Jelinek, J. Gorosabel (IAA-CSIC), J. Licandro and D. Bramich (ING La Palma), report:
"We have observed the XRT position of GRB 070223 (Vetere et al. GCN 6130) with the 4.2m WHT (+LIRIS) telescope at the Spanish Observatorio del Roque de los Muchachos in La Palma. The observations were carried out in the JHK-bands starting on Feb 23.165-23.195 UT. We detect a faint object in all bands consistent with the one reported by Mirabal et al. (GCNC 6162) and also with the XRT position given by Vetere et al. Further imaging is required to confirm if this is the NIR afterglow to GRB 070223."
This message can be quoted.
GCN Circular #6221
E. Rol, N. Tanvir (Leicester), N. Mirabal (Columbia), K. Wiersema (Amsterdam), J.P. Halpern (Columbia), A. Levan (Warwick), R. Chapman (Hertfordshire), A. Melandri (Liverpool JMU) and D. Pinfield (Hertfordshire), report on behalf of a larger collaboration:
We re-observed the position of the X-ray afterglow of GRB070223 (Vetere et al, GCN report 35.1) with the LIRIS instrument on the William Herschel Telescope, between 7.99 and 8.08 days after the burst. Our J and K images do not show any source inside the XRT 90% error circle. As our observations are considerably deeper than the first epoch LIRIS observations reported by Castro-Tirado et al (GCNC 6168; private communication), we conclude the source reported is the nIR afterglow of GRB070223.
We also re-examined the optical images taken with the MDM telescope (Mirabal et al., GCNC 6162), and find a faint optical source at the position of the nIR afterglow. We point out that this is a different source than the one located at RA (J2000) = 10 13 48.19, Dec (J2000) = 43 07 54.7 (S1, GCNC 6162), which now also falls outside the revised XRT position (Vetere et al.).
We derive a position for the optical afterglow of (J2000):
```
   RA  =  10 13 48.39
   Dec = +43 08 00.7
```
which fully agrees with the X-ray position (GCN report 35.1). Astrometry was done relative to the SDSS (Cool et al, GCNC 6128), and errors are about 0.3 arcsecond in each coordinate.
The latest MDM image is posted at http://www.astro.columbia.edu/~mirabal/grb070223mdm.jpg
arXiv:1504.02482 LRIS spectrum of host: 1.6295

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Jochen Greiner, last update: 07-Jul-2015 [Disclaimer]