Gamma-ray Burst 120102A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Jan 12 02:16:38 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     510922,   Seg_Num: 0
GRB_RA:          276.201d {+18h 24m 48s} (J2000),
                 276.324d {+18h 25m 18s} (current),
                 275.688d {+18h 22m 45s} (1950)
GRB_DEC:         +24.732d {+24d 43' 54"} (J2000),
                 +24.739d {+24d 44' 20"} (current),
                 +24.703d {+24d 42' 10"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       15188 [cnts]    Image_Peak=422 [image_cnts]
TRIGGER_DUR:     4.096 [sec] 
TRIGGER_INDEX:   289     E_range: 15-50 keV
BKG_INTEN:       132104 [cnts]
BKG_TIME:        8096.26 SOD {02:14:56.26} UT
BKG_DUR:         40 [sec]
GRB_DATE:        15928 TJD;     2 DOY;   12/01/02
GRB_TIME:        8155.01 SOD {02:15:55.01} UT
GRB_PHI:         -27.29 [deg]
GRB_THETA:        29.53 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     12.28 [sigma]
IMAGE_SIGNIF:    9.20 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +1  +0  +0  +0 -66  +0 
SUN_POSTN:       282.04d {+18h 48m 09s}  -22.98d {-22d 58' 32"}
SUN_DIST:         48.04 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:       17.03d {+01h 08m 06s}  +11.85d {+11d 50' 48"}
MOON_DIST:        94.54 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:       52.71, 16.53 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      278.43, 47.99 [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 = 153.66,-2.26 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(28.0<100sec) coincident with the FERMI_GBM event (trignum=347163385).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 02 Jan 12 02:16:29 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     347163385
GRB_RA:          281.783d {+18h 47m 08s} (J2000),
                 281.914d {+18h 47m 39s} (current),
                 281.240d {+18h 44m 58s} (1950)
GRB_DEC:         +19.567d {+19d 33' 60"} (J2000),
                 +19.580d {+19d 34' 49"} (current),
                 +19.511d {+19d 30' 40"} (1950)
GRB_ERROR:       12.43 [deg radius, statistical plus systematic]
GRB_INTEN:       251 [cnts/sec]
DATA_SIGNIF:     12.10 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        15928 TJD;     2 DOY;   12/01/02
GRB_TIME:        8183.24 SOD {02:16:23.24} UT
GRB_PHI:         324.00 [deg]
GRB_THETA:        80.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      1.17
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      91%  GRB
2nd_MOST_LIKELY:   5%  Solar Flare
DETECTORS:       0,0,0, 1,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       282.04d {+18h 48m 09s}  -22.98d {-22d 58' 32"}
SUN_DIST:         42.56 [deg]   Sun_angle= 0.0 [hr] (West of Sun)
MOON_POSTN:       17.02d {+01h 08m 06s}  +11.85d {+11d 50' 46"}
MOON_DIST:        90.76 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:       50.04,  9.70 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      285.10, 42.39 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 229.43,7.47 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 02 Jan 12 02:16:36 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      57
TRIGGER_NUM:     347163385
GRB_RA:          286.350d {+19h 05m 24s} (J2000),
                 286.485d {+19h 05m 56s} (current),
                 285.789d {+19h 03m 09s} (1950)
GRB_DEC:         +16.500d {+16d 30' 00"} (J2000),
                 +16.519d {+16d 31' 08"} (current),
                 +16.423d {+16d 25' 23"} (1950)
GRB_ERROR:       5.23 [deg radius, statistical plus systematic]
GRB_INTEN:       742 [cnts/sec]
DATA_SIGNIF:     51.80 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        15928 TJD;     2 DOY;   12/01/02
GRB_TIME:        8183.24 SOD {02:16:23.24} UT
GRB_PHI:         323.00 [deg]
GRB_THETA:        75.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.85
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      88%  GRB
2nd_MOST_LIKELY:  10%  Cyg X-1
DETECTORS:       0,0,0, 1,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       282.04d {+18h 48m 09s}  -22.98d {-22d 58' 32"}
SUN_DIST:         39.73 [deg]   Sun_angle= -0.3 [hr] (East of Sun)
MOON_POSTN:       17.03d {+01h 08m 06s}  +11.85d {+11d 50' 47"}
MOON_DIST:        87.16 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:       49.21,  4.45 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      290.26, 38.80 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 229.43,7.47 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Jan 12 02:18:24 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     510922,   Seg_Num: 0
GRB_RA:          276.2267d {+18h 24m 54.40s} (J2000),
                 276.3499d {+18h 25m 23.97s} (current),
                 275.7135d {+18h 22m 51.24s} (1950)
GRB_DEC:         +24.7127d {+24d 42' 45.7"} (J2000),
                 +24.7200d {+24d 43' 12.0"} (current),
                 +24.6837d {+24d 41' 01.4"} (1950)
GRB_ERROR:       6.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       4.02e-10 [erg/cm2/sec]
GRB_SIGNIF:      4.79 [sigma]
IMG_START_DATE:  15928 TJD;     2 DOY;   12/01/02
IMG_START_TIME:  8267.95 SOD {02:17:47.95} UT,   112.9 [sec] since BAT Trigger Time
TAM[0-3]:        327.65 237.22 261.65 243.34
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       282.04d {+18h 48m 09s}  -22.98d {-22d 58' 32"}
SUN_DIST:         48.01 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:       17.04d {+01h 08m 09s}  +11.85d {+11d 51' 05"}
MOON_DIST:        94.53 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:       52.70, 16.50 [deg] galactic lon,lat of the burst
ECL_COORDS:      278.46, 47.97 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.81 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Jan 12 02:18:35 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     510922,   Seg_Num: 0
GRB_RA:          276.2267d {+18h 24m 54.4s} (J2000),
                 276.3499d {+18h 25m 23.9s} (current),
                 275.7135d {+18h 22m 51.2s} (1950)
GRB_DEC:         +24.7127d {+24d 42' 45.7"} (J2000),
                 +24.7200d {+24d 43' 12.0"} (current),
                 +24.6837d {+24d 41' 01.4"} (1950)
GRB_ERROR:       6.5 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       23 [cnts]
IMG_START_DATE:  15928 TJD;     2 DOY;   12/01/02
IMG_START_TIME:  8267.95 SOD {02:17:47.95} UT,   112.9 [sec] since BAT Trigger Time
CENTROID_X:      305.27,  raw= 305  [pixels]
CENTROID_Y:      352.38,  raw= 352  [pixels]
ROLL:            172.79 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   128.19
GRB_POS_XRT_Z:   3.70
IMAGE_URL:       sw00510922000msxps_rw.img
SUN_POSTN:       282.04d {+18h 48m 09s}  -22.98d {-22d 58' 31"}
SUN_DIST:         48.01 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:       17.04d {+01h 08m 10s}  +11.85d {+11d 51' 07"}
MOON_DIST:        94.53 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:       52.70, 16.50 [deg] galactic lon,lat of the burst
ECL_COORDS:      278.46, 47.97 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 02 Jan 12 02:18:44 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     347163385
GRB_RA:          270.800d {+18h 03m 12s} (J2000),
                 270.933d {+18h 03m 44s} (current),
                 270.246d {+18h 00m 59s} (1950)
GRB_DEC:         +17.220d {+17d 13' 12"} (J2000),
                 +17.221d {+17d 13' 16"} (current),
                 +17.217d {+17d 13' 03"} (1950)
GRB_ERROR:       3.64 [deg radius, statistical only]
DATA_SIGNIF:     18.90 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        15928 TJD;     2 DOY;   12/01/02
GRB_TIME:        8183.24 SOD {02:16:23.24} UT
GRB_PHI:         333.00 [deg]
GRB_THETA:        86.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       282.04d {+18h 48m 09s}  -22.98d {-22d 58' 31"}
SUN_DIST:         41.64 [deg]   Sun_angle= 0.7 [hr] (West of Sun)
MOON_POSTN:       17.04d {+01h 08m 10s}  +11.85d {+11d 51' 08"}
MOON_DIST:       101.45 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:       43.39, 18.22 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      271.01, 40.66 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(28.0<100sec) coincident with the SWIFT_BAT event (trignum=510922).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 02 Jan 12 02:18:53 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      67
TRIGGER_NUM:     347163385
GRB_RA:          270.940d {+18h 03m 46s} (J2000),
                 271.073d {+18h 04m 18s} (current),
                 270.386d {+18h 01m 33s} (1950)
GRB_DEC:         +17.180d {+17d 10' 48"} (J2000),
                 +17.181d {+17d 10' 52"} (current),
                 +17.177d {+17d 10' 36"} (1950)
GRB_ERROR:       1.50 [deg radius, statistical only]
DATA_SIGNIF:     55.00 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        15928 TJD;     2 DOY;   12/01/02
GRB_TIME:        8183.24 SOD {02:16:23.24} UT
GRB_PHI:         333.00 [deg]
GRB_THETA:        86.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       282.04d {+18h 48m 09s}  -22.98d {-22d 58' 31"}
SUN_DIST:         41.56 [deg]   Sun_angle= 0.7 [hr] (West of Sun)
MOON_POSTN:       17.04d {+01h 08m 10s}  +11.85d {+11d 51' 10"}
MOON_DIST:       101.34 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:       43.41, 18.08 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      271.18, 40.62 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        Bright hard burst in the GBM.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(28.0<100sec) coincident with the SWIFT_BAT event (trignum=510922).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Jan 12 02:18:49 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     510922,   Seg_Num: 0
GRB_RA:          276.2267d {+18h 24m 54.4s} (J2000),
                 276.3499d {+18h 25m 23.9s} (current),
                 275.7135d {+18h 22m 51.2s} (1950)
GRB_DEC:         +24.7127d {+24d 42' 45.7"} (J2000),
                 +24.7200d {+24d 43' 12.0"} (current),
                 +24.6837d {+24d 41' 01.4"} (1950)
GRB_ERROR:       6.5 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       23 [cnts]
IMG_START_DATE:  15928 TJD;     2 DOY;   12/01/02
IMG_START_TIME:  8267.95 SOD {02:17:47.95} UT,   112.9 [sec] since BAT Trigger Time
CENTROID_X:      305.27,  raw= 305  [pixels]
CENTROID_Y:      352.38,  raw= 352  [pixels]
ROLL:            172.79 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   128.19
GRB_POS_XRT_Z:   3.70
IMAGE_URL:       sw00510922000msxps_rw.img
SUN_POSTN:       282.04d {+18h 48m 09s}  -22.98d {-22d 58' 31"}
SUN_DIST:         48.01 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:       17.04d {+01h 08m 10s}  +11.85d {+11d 51' 09"}
MOON_DIST:        94.53 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:       52.70, 16.50 [deg] galactic lon,lat of the burst
ECL_COORDS:      278.46, 47.97 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Jan 12 02:19:53 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     510922,   Seg_Num: 0
GRB_RA:          276.201d {+18h 24m 48s} (J2000),
                 276.324d {+18h 25m 18s} (current),
                 275.688d {+18h 22m 45s} (1950)
GRB_DEC:         +24.732d {+24d 43' 54"} (J2000),
                 +24.739d {+24d 44' 20"} (current),
                 +24.703d {+24d 42' 10"} (1950)
GRB_DATE:        15928 TJD;     2 DOY;   12/01/02
GRB_TIME:        8155.01 SOD {02:15:55.01} UT
TRIGGER_INDEX:   289
GRB_PHI:         -27.29 [deg]
GRB_THETA:        29.53 [deg]
DELTA_TIME:      45.00 [sec]
TRIGGER_DUR:     4.096 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     12.28 [sigma]
IMAGE_SIGNIF:    9.20 [sigma]
LC_URL:          sw00510922000msb.lc
SUN_POSTN:       282.04d {+18h 48m 10s}  -22.98d {-22d 58' 31"}
SUN_DIST:         48.04 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:       17.05d {+01h 08m 12s}  +11.86d {+11d 51' 19"}
MOON_DIST:        94.56 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:       52.71, 16.53 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      278.43, 47.99 [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 = 153.66,-2.26 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Jan 12 02:21:22 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     510922,   Seg_Num: 0
POINT_RA:        276.188d {+18h 24m 45s} (J2000)
POINT_DEC:       +24.707d {+24d 42' 24"} (J2000)
POINT_ROLL:      172.787d
IMG_START_DATE:  15928 TJD;     2 DOY;   12/01/02
IMG_START_TIME:  8276.45 SOD {02:17:56.45} UT,   121.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.913
N_STARS:         190
X_OFFSET:        288 [pixels]
Y_OFFSET:        544 [pixels]
X_MAX:           1247 [pixels]
Y_MAX:           1503 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00510922000msufc0121.fits
SUN_POSTN:       282.04d {+18h 48m 10s}  -22.98d {-22d 58' 31"}
SUN_DIST:         48.01 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:       17.06d {+01h 08m 15s}  +11.86d {+11d 51' 34"}
MOON_DIST:        94.58 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:       52.68, 16.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      278.41, 47.97 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Jan 12 02:21:48 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     510922,   Seg_Num: 0
POINT_RA:        276.188d {+18h 24m 45s} (J2000)
POINT_DEC:       +24.707d {+24d 42' 24"} (J2000)
POINT_ROLL:      172.787d
IMG_START_DATE:  15928 TJD;     2 DOY;   12/01/02
IMG_START_TIME:  8276.45 SOD {02:17:56.45} UT,   121.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.913
N_STARS:         190
X_OFFSET:        288 [pixels]
Y_OFFSET:        544 [pixels]
X_MAX:           1247 [pixels]
Y_MAX:           1503 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00510922000msufc0121.fits
SUN_POSTN:       282.04d {+18h 48m 10s}  -22.98d {-22d 58' 31"}
SUN_DIST:         48.01 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:       17.07d {+01h 08m 16s}  +11.86d {+11d 51' 38"}
MOON_DIST:        94.59 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:       52.68, 16.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      278.41, 47.97 [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:     Mon 02 Jan 12 02:23:11 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     510922,   Seg_Num: 0
POINT_RA:        276.188d {+18h 24m 45s} (J2000)
POINT_DEC:       +24.707d {+24d 42' 24"} (J2000)
ROLL:            172.787d
IMG_START_DATE:  15928 TJD;     2 DOY;   12/01/02
IMG_START_TIME:  8276.45 SOD {02:17:56.45} UT,   121.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     347163484
X_OFFSET:        671 [pixels]
Y_OFFSET:        659 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       831
Y_GRB_POS:       819
BINNING_INDEX:   1
IM_URL:          sw00510922000msuni0129.fits
SUN_POSTN:       282.04d {+18h 48m 10s}  -22.98d {-22d 58' 31"}
SUN_DIST:         48.01 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:       17.08d {+01h 08m 19s}  +11.86d {+11d 51' 52"}
MOON_DIST:        94.59 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:       52.68, 16.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      278.41, 47.97 [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:     Mon 02 Jan 12 02:23:31 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     510922,   Seg_Num: 0
POINT_RA:        276.188d {+18h 24m 45s} (J2000)
POINT_DEC:       +24.707d {+24d 42' 24"} (J2000)
ROLL:            172.787d
IMG_START_DATE:  15928 TJD;     2 DOY;   12/01/02
IMG_START_TIME:  8276.45 SOD {02:17:56.45} UT,   121.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     347163484
X_OFFSET:        671 [pixels]
Y_OFFSET:        659 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       831
Y_GRB_POS:       819
BINNING_INDEX:   1
IM_URL:          sw00510922000msuni0129.fits
SUN_POSTN:       282.04d {+18h 48m 10s}  -22.98d {-22d 58' 30"}
SUN_DIST:         48.01 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:       17.08d {+01h 08m 19s}  +11.87d {+11d 51' 55"}
MOON_DIST:        94.60 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:       52.68, 16.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      278.41, 47.97 [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:     Mon 02 Jan 12 02:26:16 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     510922,   Seg_Num: 0
GRB_RA:          276.2245d {+18h 24m 53.87s} (J2000),
                 276.3477d {+18h 25m 23.44s} (current),
                 275.7113d {+18h 22m 50.71s} (1950)
GRB_DEC:         +24.7131d {+24d 42' 47.1"} (J2000),
                 +24.7204d {+24d 43' 13.4"} (current),
                 +24.6842d {+24d 41' 02.9"} (1950)
GRB_ERROR:       0.6 [arcsec radius, statistical only]
GRB_MAG:         18.04 +/- 0.14 [mag]
FILTER:          10, White
IMG_START_DATE:  15928 TJD;     2 DOY;   12/01/02
IMG_START_TIME:  8276.00 SOD {02:17:56.00} UT,   121.0 [sec] since BAT Trigger Time
SUN_POSTN:       282.04d {+18h 48m 11s}  -22.98d {-22d 58' 30"}
SUN_DIST:         48.01 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:       17.10d {+01h 08m 24s}  +11.87d {+11d 52' 22"}
MOON_DIST:        94.58 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:       52.70, 16.50 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      278.46, 47.97 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The UVOT position is 6.8 arcsec from the XRT position.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN Circular #12794
F. E. Marshall (NASA/GSFC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), D. N. Burrows (PSU), N. Gehrels (NASA/GSFC), E. A. Hoversten (PSU), A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (NASA/GSFC), T. Sakamoto (NASA/UMBC), C. J. Saxton (UCL-MSSL), C. A. Swenson (PSU) and T. N. Ukwatta (MSU) report on behalf of the Swift Team:
At 02:15:55 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 120102A (trigger=510922). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 276.201, +24.732 which is
```
   RA(J2000)  =  18h 24m 48s
   Dec(J2000) = +24d 43' 54"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows an initial small peak and then a much larger peak 32 sec later with a toal duration of about 50 sec. The peak count rate was ~15,000 counts/sec (15-350 keV), at ~33 sec after the trigger.
The XRT began observing the field at 02:17:47.9 UT, 112.9 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source located at RA, Dec 276.22495, 24.71375 which is equivalent to:
```
   RA(J2000)  = 18h 24m 53.99s
   Dec(J2000) = +24d 42' 49.5"
```
with an uncertainty of 3.7 arcseconds (radius, 90% containment). This location is 102 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (1.03 x 10^21 cm^-2, Kalberla et al. 2005), with an excess column of 4.1 (+2.17/-1.89) x 10^21 cm^-2 (90% confidence).
The initial flux in the 2.5 s image was 4.02e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 121 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	18:24:53.90 = 276.22457
  DEC(J2000) = +24:42:47.3  =  24.71314
```
with a 90%-confidence error radius of about 0.62 arc sec. This position is 3.3 arc sec. from the center of the XRT error circle. The estimated magnitude is 18.04 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.13.
Burst Advocate for this burst is F. E. Marshall (marshall AT milkyway.gsfc.nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Jan 12 02:29:59 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     510922,   Seg_Num: 0
POINT_RA:        276.189d {+18h 24m 45s} (J2000)
POINT_DEC:       +24.708d {+24d 42' 27"} (J2000)
POINT_ROLL:      172.789d
IMG_START_DATE:  15928 TJD;     2 DOY;   12/01/02
IMG_START_TIME:  8488.70 SOD {02:21:28.70} UT,   333.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.314
N_STARS:         103
X_OFFSET:        351 [pixels]
Y_OFFSET:        339 [pixels]
X_MAX:           1310 [pixels]
Y_MAX:           1298 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00510922000msufc0333.fits
SUN_POSTN:       282.05d {+18h 48m 11s}  -22.98d {-22d 58' 29"}
SUN_DIST:         48.01 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:       17.13d {+01h 08m 31s}  +11.88d {+11d 52' 58"}
MOON_DIST:        94.63 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:       52.68, 16.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      278.41, 47.97 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Jan 12 02:30:20 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     510922,   Seg_Num: 0
POINT_RA:        276.189d {+18h 24m 45s} (J2000)
POINT_DEC:       +24.708d {+24d 42' 27"} (J2000)
POINT_ROLL:      172.789d
IMG_START_DATE:  15928 TJD;     2 DOY;   12/01/02
IMG_START_TIME:  8488.70 SOD {02:21:28.70} UT,   333.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.314
N_STARS:         103
X_OFFSET:        351 [pixels]
Y_OFFSET:        339 [pixels]
X_MAX:           1310 [pixels]
Y_MAX:           1298 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00510922000msufc0333.fits
SUN_POSTN:       282.05d {+18h 48m 11s}  -22.97d {-22d 58' 29"}
SUN_DIST:         48.01 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:       17.13d {+01h 08m 32s}  +11.88d {+11d 53' 02"}
MOON_DIST:        94.63 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:       52.68, 16.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      278.41, 47.97 [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:     Mon 02 Jan 12 02:30:37 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     510922,   Seg_Num: 0
GRB_RA:          276.2246d {+18h 24m 53.90s} (J2000),
                 276.3478d {+18h 25m 23.47s} (current),
                 275.7114d {+18h 22m 50.74s} (1950)
GRB_DEC:         +24.7133d {+24d 42' 47.8"} (J2000),
                 +24.7206d {+24d 43' 14.2"} (current),
                 +24.6844d {+24d 41' 03.6"} (1950)
GRB_ERROR:       2.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15928 TJD;     2 DOY;   12/01/02
IMG_START_TIME:  8310.00 SOD {02:18:30.00} UT,   155.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       282.05d {+18h 48m 12s}  -22.97d {-22d 58' 29"}
SUN_DIST:         48.02 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:       17.14d {+01h 08m 33s}  +11.88d {+11d 53' 05"}
MOON_DIST:        94.60 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:       52.70, 16.50 [deg] galactic lon,lat of the burst
ECL_COORDS:      278.46, 47.97 [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 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Jan 12 02:31:27 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     510922,   Seg_Num: 0
POINT_RA:        276.189d {+18h 24m 45s} (J2000)
POINT_DEC:       +24.708d {+24d 42' 27"} (J2000)
ROLL:            172.789d
IMG_START_DATE:  15928 TJD;     2 DOY;   12/01/02
IMG_START_TIME:  8488.70 SOD {02:21:28.70} UT,   333.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     347163696
X_OFFSET:        671 [pixels]
Y_OFFSET:        659 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       831
Y_GRB_POS:       819
BINNING_INDEX:   1
IM_URL:          sw00510922000msuni0341.fits
SUN_POSTN:       282.05d {+18h 48m 12s}  -22.97d {-22d 58' 29"}
SUN_DIST:         48.01 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:       17.14d {+01h 08m 34s}  +11.89d {+11d 53' 13"}
MOON_DIST:        94.64 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:       52.68, 16.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      278.41, 47.97 [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:     Mon 02 Jan 12 02:31:41 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     510922,   Seg_Num: 0
POINT_RA:        276.189d {+18h 24m 45s} (J2000)
POINT_DEC:       +24.708d {+24d 42' 27"} (J2000)
ROLL:            172.789d
IMG_START_DATE:  15928 TJD;     2 DOY;   12/01/02
IMG_START_TIME:  8488.70 SOD {02:21:28.70} UT,   333.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     347163696
X_OFFSET:        671 [pixels]
Y_OFFSET:        659 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       831
Y_GRB_POS:       819
BINNING_INDEX:   1
IM_URL:          sw00510922000msuni0341.fits
SUN_POSTN:       282.05d {+18h 48m 12s}  -22.97d {-22d 58' 29"}
SUN_DIST:         48.01 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:       17.14d {+01h 08m 35s}  +11.89d {+11d 53' 15"}
MOON_DIST:        94.64 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:       52.68, 16.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      278.41, 47.97 [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:     Mon 02 Jan 12 02:37:04 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     510922,   Seg_Num: 0
POINT_RA:        276.189d {+18h 24m 45s} (J2000)
POINT_DEC:       +24.708d {+24d 42' 28"} (J2000)
POINT_ROLL:      172.789d
IMG_START_DATE:  15928 TJD;     2 DOY;   12/01/02
IMG_START_TIME:  9019.51 SOD {02:30:19.51} UT,   864.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.941
N_STARS:         190
X_OFFSET:        111 [pixels]
Y_OFFSET:        99 [pixels]
X_MAX:           1550 [pixels]
Y_MAX:           1538 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00510922000msufc0864.fits
SUN_POSTN:       282.05d {+18h 48m 13s}  -22.97d {-22d 58' 28"}
SUN_DIST:         48.01 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:       17.19d {+01h 08m 45s}  +11.90d {+11d 54' 08"}
MOON_DIST:        94.67 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:       52.68, 16.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      278.41, 47.97 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 02 Jan 12 02:37:31 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     510922,   Seg_Num: 0
POINT_RA:        276.189d {+18h 24m 45s} (J2000)
POINT_DEC:       +24.708d {+24d 42' 28"} (J2000)
POINT_ROLL:      172.789d
IMG_START_DATE:  15928 TJD;     2 DOY;   12/01/02
IMG_START_TIME:  9019.51 SOD {02:30:19.51} UT,   864.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.941
N_STARS:         190
X_OFFSET:        111 [pixels]
Y_OFFSET:        99 [pixels]
X_MAX:           1550 [pixels]
Y_MAX:           1538 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00510922000msufc0864.fits
SUN_POSTN:       282.05d {+18h 48m 13s}  -22.97d {-22d 58' 27"}
SUN_DIST:         48.01 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:       17.19d {+01h 08m 46s}  +11.90d {+11d 54' 12"}
MOON_DIST:        94.68 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:       52.68, 16.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      278.41, 47.97 [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:     Mon 02 Jan 12 02:38:32 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     510922,   Seg_Num: 0
POINT_RA:        276.189d {+18h 24m 45s} (J2000)
POINT_DEC:       +24.708d {+24d 42' 28"} (J2000)
ROLL:            172.789d
IMG_START_DATE:  15928 TJD;     2 DOY;   12/01/02
IMG_START_TIME:  9019.51 SOD {02:30:19.51} UT,   864.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     347164227
X_OFFSET:        670 [pixels]
Y_OFFSET:        658 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       830
Y_GRB_POS:       818
BINNING_INDEX:   1
IM_URL:          sw00510922000msuni0872.fits
SUN_POSTN:       282.05d {+18h 48m 13s}  -22.97d {-22d 58' 27"}
SUN_DIST:         48.01 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:       17.20d {+01h 08m 48s}  +11.91d {+11d 54' 22"}
MOON_DIST:        94.68 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:       52.68, 16.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      278.41, 47.97 [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:     Mon 02 Jan 12 02:38:49 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     510922,   Seg_Num: 0
POINT_RA:        276.189d {+18h 24m 45s} (J2000)
POINT_DEC:       +24.708d {+24d 42' 28"} (J2000)
ROLL:            172.789d
IMG_START_DATE:  15928 TJD;     2 DOY;   12/01/02
IMG_START_TIME:  9019.51 SOD {02:30:19.51} UT,   864.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     347164227
X_OFFSET:        670 [pixels]
Y_OFFSET:        658 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       830
Y_GRB_POS:       818
BINNING_INDEX:   1
IM_URL:          sw00510922000msuni0872.fits
SUN_POSTN:       282.05d {+18h 48m 13s}  -22.97d {-22d 58' 27"}
SUN_DIST:         48.01 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:       17.20d {+01h 08m 48s}  +11.91d {+11d 54' 25"}
MOON_DIST:        94.68 [deg]
MOON_ILLUM:      58 [%]
GAL_COORDS:       52.68, 16.53 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      278.41, 47.97 [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 #12795
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 967 s of XRT Photon Counting mode data and 2 UVOT images for GRB 120102A, 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 = 276.22471, +24.71352 which is equivalent to:
```
RA (J2000): 18h 24m 53.93s
Dec (J2000): +24d 42' 48.7"
```
with an uncertainty of 1.8 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 #12796
A. A. Breeveld (MSSL-UCL) and F. E. Marshall (NASA/GSFC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 120102A 121 s after the BAT trigger (Marshall et al., GCN Circ. 12794). A fading source consistent with the XRT position (Beardmore et al., GCN=20 Circ. 12795) is detected in the initial UVOT exposures.
The preliminary UVOT position is:
```
     RA  (J2000) =3D  18:24:53.89 =3D 276.22456 (deg.)
     Dec (J2000) =3D +24:42:47.1  =3D  24.71309 (deg.)
```
with an estimated uncertainty of 0.51 arc sec. (radius, 90% confidence).
Preliminary detections and 3-sigma upper limits using the UVOT=20 photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the finding chart=20 (FC) and early exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white (FC)         121          271          147         18.10 =B1 0.06
white              788         1014          167         19.9  =B1 0.2
v                  663         1239           78         18.16 =B1 0.31
b                  589        11310         1147        >20.8
u                  334          583          246         18.52 =B1 0.14
w1                 713         6983          452        >20.2
m2                 688         6778          452        >20.1
w2                 639        12879         1112        >20.9
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) =3D 0.13 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #12797
O.M. Littlejohns (U. Leicester), G. Stratta (ASDC), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), D.N. Burrows (PSU), J.A. Kennea (PSU), M.C. Stroh (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester) and F.E. Marshall report on behalf of the Swift-XRT team:
We have analysed 12 ks of XRT data for GRB 120102A (Marshall et al. GCN Circ. 12794), from 119 s to 34.6 ks after the BAT trigger. The data comprise 240 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN. Circ 12795).
The late-time light curve (from T0+4.5 ks) can be modelled with an initial power-law decay with an index of alpha=1.99 (+0.27, -0.11), followed by a break at T+13.0 ks to an alpha of 0.97 (+0.27, -0.22).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.04 (+/-0.08). The best-fitting absorption column is 2.59 (+0.26, -0.25) x 10^21 cm^-2, in excess of the Galactic value of 1.0 x 10^21 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.0 x 10^-11 (6.2 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.59 (+0.26, -0.25) x 10^21 cm^-2
Galactic foreground: 1.0 x 10^21 cm^-2
Excess significance: 10.3 sigma
Photon index:	     2.04 (+/-0.08)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00510922.
This circular is an official product of the Swift-XRT team.
GCN Circular #12799
C. B. Markwardt (GSFC), 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), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from recent telemetry downlinks, we report further analysis of BAT GRB 120102A (trigger #510922) (Marshall, et al., GCN Circ. 12794). The BAT ground-calculated position is RA, Dec = 276.224, 24.713 deg, which is
```
   RA(J2000)  =  18h 24m 53.8s 
   Dec(J2000) = +24d 42' 46.7" 
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 78%.
The mask-weighted light curve shows a weak peak starting at ~T_0 and returning to baseline at ~T+20 sec. The main emission starts at ~T+25 sec with 2, or possibly 3, overlapping peaks, with the peak emission at ~T+33 sec, which then approximately exponentially decays out to 510 sec or possibly out to ~750 sec. At the 3- or 4-sigma level, there is a possible precursor peak at ~T-70 sec with a duration of 10-20 sec. T90 (15-350 keV) is 38.7 +- 3.5 sec (estimated error including systematics).
The time-averaged spectrum from T+0.77 to T+53.94 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.59 +- 0.05. The fluence in the 15-150 keV band is 4.3 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+32.75 sec in the 15-150 keV band is 10.3 +- 0.4 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/510922/BA/
GCN Circular #12800
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 120102A (Swift-BAT trigger=510922: Marshall et al., GCN 12794; Markwardt et al., GCN 12799) triggered Konus-Wind at T0=8181.530 s UT (02:16:21.530).
The burst light curve shows a single pulse with a duration of ~15 s. There is a weak precursor marginally seen at ~T0-30 s.
As observed by Konus-Wind the burst had a fluence of 1.75(-0.26,+0.30)x10^-5 erg/cm2, and a 256-ms peak flux measured from T0+3.536 s of 5.56(-1.02, +1.12)x10^-6 erg/cm2/s (both in the 20 keV - 4 MeV energy range).
The time-integrated spectrum of the burst (from T0 to T0+16.640 s) is well fitted (in the 20 keV - 4 MeV range) by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep), with alpha = -1.47(-0.07, +0.09), and Ep = 805(-180, +288) keV (chi2 = 68.4/73 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and only an upper limit on the high energy photon index: beta < -2.04.
All the quoted results are preliminary. All the quoted errors are at the 90% confidence level.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB120102_T08181/
GCN Circular #12801
S. Xiong (UAH) reports on behalf of the Fermi GBM Team:
"At 02:16:23.24 UT on 02 Jan 2012, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 120102A (trigger 347163385 / 120102095), which was also detected by the Swift BAT/XRT/UVOT (F. E. Marshall et al. 2012, GCN 12794) The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 84 degrees.
The GBM light curve consists of two main pulses with a duration (T90) of about 17 s (50-300 keV). The time-averaged spectrum from T0-1 s to T0+13 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.19 +/- 0.03 and the cutoff energy, parameterized as Epeak, is 380 +/- 33 keV. A Band function fits the spectrum equally well with Epeak = 291 +/- 33 keV, alpha = -1.13 +/- 0.04, and beta = -2.14 +/- 0.13.
The event fluence (10-1000 keV) in this time interval is (1.26 +/- 0.03)E-5 erg/cm^2. The 64 ms peak photon flux measured starting from T0+4.8 s in the 10-1000 keV band is 22.8 +/- 1.6 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #12875
V. V. Golovnya (Main Astro Obs, Kyiv) report: We have undertaken the review of the sky area in vicinity of GRB 120102A (A.P. Beardmore et al., GCN Circ.12795) on astronegatives, collected in Ukrainian NAS Main astronomical observatory plate archive (1976-1996). All the plates with the possible object appearance are digitized using Microtek ScanMaker 9800XL TMA and Epson Expression 10000XL flatbed scanners and have been placed into Golosiiv Plate Archive database DBGPA with open access to them.
The list of plates is given in the table:
```
YYYYMMDD/TimeUT	--Plates---	Exp.	LimM	Star USNOA2 
19890629/211821	EAO040B001801	13.5	16.50	1125-09467284
19890708/212336	GUA040C001487	16.0	16.45	1125-09467782
19890803/192540	GUA040C001492A	16.0	16.00	1125-09466499
19890803/194958	GUA040C001493	16.0	16.00	1125-09466499
19890905/172315	EAO040B001991	13.5	16.50	1125-09467284
Plates-the plate's identifier in	
GUA040C archive of DWA (D/F=400/2000, M=103"/mm) of the	
	Ukrainian NAS Main Astro obs in Kyiv	
	(Marsden's number - 83) and	
EAO040B archive of DWAZ (D/F=400/2000, M=103"/mm) of the 
	Engelhardt South. St. Zelenchuk Russia	
	(Marsden's number - 114) [1].	
Exp.   - Duration of the maximum exposure (minutes).	
LimM - Limited V mag, derived in the 8 minutes area around 
	the location given in GCN Circ.12795:		
	RA(J2000): 18h 24m 53.93s, Dec(J2000): +24d 42' 48.7"
Star USNOA2 - Comparison star.	
```
The preview images of 5 areas together with the 8x8 min.of arc area from SkyMap can be found in http://gua.db.ukr-vo.org/img/grb/120102A/index.html The images with full resolution are available via e-mail on demand.
References:
1.L.Pakuliak DATABASE of GOLOSIIV PLATE ARCHIVE (DBGPA V2.0), http://gua.db.ukr-vo.org
GCN Report 356.1
GCN_Report 356.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_356_1.pdf by F.E. Marshall at NASA/GSFC titled: "Final Swift Observations of GRB 120102A"

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Jochen Greiner, last update: 19-Jan-2012 [Disclaimer]