Gamma-ray Burst 150101A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Jan 15 06:29:09 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     623158,   Seg_Num: 0
GRB_RA:          312.631d {+20h 50m 31s} (J2000),
                 312.777d {+20h 51m 07s} (current),
                 312.143d {+20h 48m 34s} (1950)
GRB_DEC:         +36.728d {+36d 43' 39"} (J2000),
                 +36.784d {+36d 47' 03"} (current),
                 +36.540d {+36d 32' 24"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       368 [cnts]    Image_Peak=51 [image_cnts]
TRIGGER_DUR:     0.064 [sec] 
TRIGGER_INDEX:   10418     E_range: 25-100 keV
BKG_INTEN:       16730 [cnts]
BKG_TIME:        23323.00 SOD {06:28:43.00} UT
BKG_DUR:         8 [sec]
GRB_DATE:        17023 TJD;     1 DOY;   15/01/01
GRB_TIME:        23333.56 SOD {06:28:53.56} UT
GRB_PHI:         -104.57 [deg]
GRB_THETA:        13.87 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     19.44 [sigma]
IMAGE_SIGNIF:    7.46 [sigma]
MERIT_PARAMS:     +1  +0  +0  -4  +2  -2  +0  +1 -39  +0 
SUN_POSTN:       281.43d {+18h 45m 42s}  -23.02d {-23d 01' 14"}
SUN_DIST:         66.71 [deg]   Sun_angle= -2.1 [hr] (East of Sun)
MOON_POSTN:       52.63d {+03h 30m 31s}  +15.72d {+15d 43' 17"}
MOON_DIST:        88.26 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:       78.66, -4.68 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      330.82, 51.56 [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 = 107.44,8.55 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(0.0<100sec) coincident with the FERMI_GBM event (trignum=441786536).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 01 Jan 15 06:29:23 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     441786536
GRB_RA:          285.383d {+19h 01m 32s} (J2000),
                 285.513d {+19h 02m 03s} (current),
                 284.951d {+18h 59m 48s} (1950)
GRB_DEC:         +37.783d {+37d 46' 60"} (J2000),
                 +37.806d {+37d 48' 20"} (current),
                 +37.710d {+37d 42' 38"} (1950)
GRB_ERROR:       23.70 [deg radius, statistical plus systematic]
GRB_INTEN:       565 [cnts/sec]
DATA_SIGNIF:     5.10 [sigma]
INTEG_TIME:      0.032 [sec]
GRB_DATE:        17023 TJD;     1 DOY;   15/01/01
GRB_TIME:        23333.76 SOD {06:28:53.76} UT
GRB_PHI:         310.00 [deg]
GRB_THETA:        30.00 [deg]
DATA_TIME_SCALE: 0.0320 [sec]
HARD_RATIO:      0.63
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      87%  GRB
2nd_MOST_LIKELY:   9%  Cyg X-1
DETECTORS:       1,0,0, 1,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       281.43d {+18h 45m 43s}  -23.02d {-23d 01' 14"}
SUN_DIST:         60.95 [deg]   Sun_angle= -0.3 [hr] (East of Sun)
MOON_POSTN:       52.63d {+03h 30m 32s}  +15.72d {+15d 43' 19"}
MOON_DIST:       107.03 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:       68.33, 14.38 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      294.72, 59.91 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2015/bn150101270/quicklook/glg_lc_medres34_bn150101270.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 154.40,1.38 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=623158).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 01 Jan 15 06:29:34 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     441786536
GRB_RA:          302.980d {+20h 11m 55s} (J2000),
                 303.119d {+20h 12m 29s} (current),
                 302.517d {+20h 10m 04s} (1950)
GRB_DEC:         +37.290d {+37d 17' 24"} (J2000),
                 +37.336d {+37d 20' 08"} (current),
                 +37.139d {+37d 08' 22"} (1950)
GRB_ERROR:       31.60 [deg radius, statistical only]
DATA_SIGNIF:     5.30 [sigma]
DATA_INTERVAL:   0.032 [sec]
GRB_DATE:        17023 TJD;     1 DOY;   15/01/01
GRB_TIME:        23333.76 SOD {06:28:53.76} UT
GRB_PHI:         328.00 [deg]
GRB_THETA:        18.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       281.43d {+18h 45m 43s}  -23.02d {-23d 01' 14"}
SUN_DIST:         63.72 [deg]   Sun_angle= -1.4 [hr] (East of Sun)
MOON_POSTN:       52.63d {+03h 30m 32s}  +15.72d {+15d 43' 20"}
MOON_DIST:        95.24 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:       74.56,  1.87 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      319.39, 55.22 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2015/bn150101270/quicklook/glg_lc_medres34_bn150101270.gif
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=623158).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Jan 15 06:30:04 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     623158,   Seg_Num: 0
POINT_RA:        312.646d {+20h 50m 35s} (J2000)
POINT_DEC:       +36.738d {+36d 44' 18"} (J2000)
IMG_START_DATE:  17023 TJD;     1 DOY;   15/01/01
IMG_START_TIME:  23394.48 SOD {06:29:54.48} UT,   60.9 [sec] since BAT Trigger Time
COUNTS:          1    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        0    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Jan 15 06:32:49 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     623158,   Seg_Num: 0
GRB_RA:          312.631d {+20h 50m 31s} (J2000),
                 312.777d {+20h 51m 07s} (current),
                 312.143d {+20h 48m 34s} (1950)
GRB_DEC:         +36.728d {+36d 43' 39"} (J2000),
                 +36.784d {+36d 47' 03"} (current),
                 +36.540d {+36d 32' 24"} (1950)
GRB_DATE:        17023 TJD;     1 DOY;   15/01/01
GRB_TIME:        23333.69 SOD {06:28:53.69} UT
TRIGGER_INDEX:   10418
GRB_PHI:         -104.57 [deg]
GRB_THETA:        13.87 [deg]
DELTA_TIME:      51.00 [sec]
TRIGGER_DUR:     0.064 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     19.44 [sigma]
IMAGE_SIGNIF:    7.46 [sigma]
LC_URL:          sw00623158000msb.lc
SUN_POSTN:       281.43d {+18h 45m 43s}  -23.02d {-23d 01' 14"}
SUN_DIST:         66.71 [deg]   Sun_angle= -2.1 [hr] (East of Sun)
MOON_POSTN:       52.66d {+03h 30m 40s}  +15.73d {+15d 43' 38"}
MOON_DIST:        88.28 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:       78.66, -4.68 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      330.82, 51.56 [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 = 107.44,8.55 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Jan 15 06:33:17 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     623158,   Seg_Num: 0
POINT_RA:        312.646d {+20h 50m 35s} (J2000)
POINT_DEC:       +36.739d {+36d 44' 19"} (J2000)
POINT_ROLL:      211.310d
IMG_START_DATE:  17023 TJD;     1 DOY;   15/01/01
IMG_START_TIME:  23398.85 SOD {06:29:58.85} UT,   65.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.628
N_STARS:         190
X_OFFSET:        605 [pixels]
Y_OFFSET:        512 [pixels]
X_MAX:           1564 [pixels]
Y_MAX:           1471 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00623158000msufc0065.fits
SUN_POSTN:       281.43d {+18h 45m 43s}  -23.02d {-23d 01' 14"}
SUN_DIST:         66.73 [deg]   Sun_angle= -2.1 [hr] (East of Sun)
MOON_POSTN:       52.67d {+03h 30m 41s}  +15.73d {+15d 43' 41"}
MOON_DIST:        88.27 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:       78.68, -4.68 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      330.84, 51.56 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Jan 15 06:33:47 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     623158,   Seg_Num: 0
POINT_RA:        312.646d {+20h 50m 35s} (J2000)
POINT_DEC:       +36.739d {+36d 44' 19"} (J2000)
POINT_ROLL:      211.310d
IMG_START_DATE:  17023 TJD;     1 DOY;   15/01/01
IMG_START_TIME:  23398.85 SOD {06:29:58.85} UT,   65.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.628
N_STARS:         190
X_OFFSET:        605 [pixels]
Y_OFFSET:        512 [pixels]
X_MAX:           1564 [pixels]
Y_MAX:           1471 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00623158000msufc0065.fits
SUN_POSTN:       281.43d {+18h 45m 43s}  -23.02d {-23d 01' 14"}
SUN_DIST:         66.73 [deg]   Sun_angle= -2.1 [hr] (East of Sun)
MOON_POSTN:       52.67d {+03h 30m 42s}  +15.73d {+15d 43' 44"}
MOON_DIST:        88.28 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:       78.68, -4.68 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      330.84, 51.56 [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:     Thu 01 Jan 15 06:34:45 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     623158,   Seg_Num: 0
POINT_RA:        312.646d {+20h 50m 35s} (J2000)
POINT_DEC:       +36.739d {+36d 44' 19"} (J2000)
ROLL:            211.310d
IMG_START_DATE:  17023 TJD;     1 DOY;   15/01/01
IMG_START_TIME:  23398.85 SOD {06:29:58.85} UT,   65.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     441786611
X_OFFSET:        924 [pixels]
Y_OFFSET:        831 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1084
Y_GRB_POS:       991
BINNING_INDEX:   1
IM_URL:          sw00623158000msuni0078.fits
SUN_POSTN:       281.43d {+18h 45m 44s}  -23.02d {-23d 01' 13"}
SUN_DIST:         66.73 [deg]   Sun_angle= -2.1 [hr] (East of Sun)
MOON_POSTN:       52.68d {+03h 30m 44s}  +15.73d {+15d 43' 49"}
MOON_DIST:        88.28 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:       78.68, -4.68 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      330.84, 51.56 [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:     Thu 01 Jan 15 06:35:04 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     623158,   Seg_Num: 0
POINT_RA:        312.646d {+20h 50m 35s} (J2000)
POINT_DEC:       +36.739d {+36d 44' 19"} (J2000)
ROLL:            211.310d
IMG_START_DATE:  17023 TJD;     1 DOY;   15/01/01
IMG_START_TIME:  23398.85 SOD {06:29:58.85} UT,   65.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     441786611
X_OFFSET:        924 [pixels]
Y_OFFSET:        831 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1084
Y_GRB_POS:       991
BINNING_INDEX:   1
IM_URL:          sw00623158000msuni0078.fits
SUN_POSTN:       281.43d {+18h 45m 44s}  -23.02d {-23d 01' 13"}
SUN_DIST:         66.73 [deg]   Sun_angle= -2.1 [hr] (East of Sun)
MOON_POSTN:       52.69d {+03h 30m 45s}  +15.73d {+15d 43' 51"}
MOON_DIST:        88.28 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:       78.68, -4.68 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      330.84, 51.56 [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:     Thu 01 Jan 15 06:40:10 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     623158,   Seg_Num: 0
POINT_RA:        312.647d {+20h 50m 35s} (J2000)
POINT_DEC:       +36.742d {+36d 44' 30"} (J2000)
POINT_ROLL:      211.311d
IMG_START_DATE:  17023 TJD;     1 DOY;   15/01/01
IMG_START_TIME:  23610.93 SOD {06:33:30.93} UT,   277.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.092
N_STARS:         190
X_OFFSET:        365 [pixels]
Y_OFFSET:        272 [pixels]
X_MAX:           1804 [pixels]
Y_MAX:           1711 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00623158000msufc0277.fits
SUN_POSTN:       281.44d {+18h 45m 45s}  -23.02d {-23d 01' 12"}
SUN_DIST:         66.73 [deg]   Sun_angle= -2.1 [hr] (East of Sun)
MOON_POSTN:       52.73d {+03h 30m 56s}  +15.74d {+15d 44' 20"}
MOON_DIST:        88.31 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:       78.68, -4.68 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      330.85, 51.56 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Jan 15 06:40:32 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     623158,   Seg_Num: 0
POINT_RA:        312.647d {+20h 50m 35s} (J2000)
POINT_DEC:       +36.742d {+36d 44' 30"} (J2000)
POINT_ROLL:      211.311d
IMG_START_DATE:  17023 TJD;     1 DOY;   15/01/01
IMG_START_TIME:  23610.93 SOD {06:33:30.93} UT,   277.4 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.092
N_STARS:         190
X_OFFSET:        365 [pixels]
Y_OFFSET:        272 [pixels]
X_MAX:           1804 [pixels]
Y_MAX:           1711 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00623158000msufc0277.fits
SUN_POSTN:       281.44d {+18h 45m 45s}  -23.02d {-23d 01' 12"}
SUN_DIST:         66.73 [deg]   Sun_angle= -2.1 [hr] (East of Sun)
MOON_POSTN:       52.74d {+03h 30m 57s}  +15.74d {+15d 44' 22"}
MOON_DIST:        88.32 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:       78.68, -4.68 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      330.85, 51.56 [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:     Thu 01 Jan 15 06:41:33 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     623158,   Seg_Num: 0
POINT_RA:        312.647d {+20h 50m 35s} (J2000)
POINT_DEC:       +36.742d {+36d 44' 30"} (J2000)
ROLL:            211.311d
IMG_START_DATE:  17023 TJD;     1 DOY;   15/01/01
IMG_START_TIME:  23610.93 SOD {06:33:30.93} UT,   277.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     441786823
X_OFFSET:        924 [pixels]
Y_OFFSET:        831 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1084
Y_GRB_POS:       991
BINNING_INDEX:   1
IM_URL:          sw00623158000msuni0290.fits
SUN_POSTN:       281.44d {+18h 45m 45s}  -23.02d {-23d 01' 12"}
SUN_DIST:         66.73 [deg]   Sun_angle= -2.1 [hr] (East of Sun)
MOON_POSTN:       52.75d {+03h 30m 59s}  +15.74d {+15d 44' 28"}
MOON_DIST:        88.32 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:       78.68, -4.68 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      330.85, 51.56 [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:     Thu 01 Jan 15 06:41:56 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     623158,   Seg_Num: 0
POINT_RA:        312.647d {+20h 50m 35s} (J2000)
POINT_DEC:       +36.742d {+36d 44' 30"} (J2000)
ROLL:            211.311d
IMG_START_DATE:  17023 TJD;     1 DOY;   15/01/01
IMG_START_TIME:  23610.93 SOD {06:33:30.93} UT,   277.4 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     441786823
X_OFFSET:        924 [pixels]
Y_OFFSET:        831 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1084
Y_GRB_POS:       991
BINNING_INDEX:   1
IM_URL:          sw00623158000msuni0290.fits
SUN_POSTN:       281.44d {+18h 45m 45s}  -23.02d {-23d 01' 12"}
SUN_DIST:         66.73 [deg]   Sun_angle= -2.1 [hr] (East of Sun)
MOON_POSTN:       52.75d {+03h 31m 00s}  +15.74d {+15d 44' 30"}
MOON_DIST:        88.32 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:       78.68, -4.68 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      330.85, 51.56 [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:     Thu 01 Jan 15 06:45:08 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     623158,   Seg_Num: 0
GRB_RA:          312.6037d {+20h 50m 24.88s} (J2000),
                 312.7500d {+20h 51m 00.00s} (current),
                 312.1162d {+20h 48m 27.88s} (1950)
GRB_DEC:         +36.7334d {+36d 44' 00.2"} (J2000),
                 +36.7900d {+36d 47' 24.0"} (current),
                 +36.5458d {+36d 32' 44.9"} (1950)
GRB_ERROR:       3.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17023 TJD;     1 DOY;   15/01/01
IMG_START_TIME:  23404.00 SOD {06:30:04.00} UT,   70.4 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       281.44d {+18h 45m 45s}  -23.02d {-23d 01' 11"}
SUN_DIST:         66.70 [deg]   Sun_angle= -2.1 [hr] (East of Sun)
MOON_POSTN:       52.78d {+03h 31m 07s}  +15.75d {+15d 44' 48"}
MOON_DIST:        88.38 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:       78.65, -4.65 [deg] galactic lon,lat of the burst
ECL_COORDS:      330.79, 51.57 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 2.8% < P(seren) < 6.6%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Jan 15 06:46:05 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     623158,   Seg_Num: 0
POINT_RA:        312.647d {+20h 50m 35s} (J2000)
POINT_DEC:       +36.742d {+36d 44' 30"} (J2000)
POINT_ROLL:      211.311d
IMG_START_DATE:  17023 TJD;     1 DOY;   15/01/01
IMG_START_TIME:  24188.83 SOD {06:43:08.83} UT,   855.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.495
N_STARS:         190
X_OFFSET:        365 [pixels]
Y_OFFSET:        272 [pixels]
X_MAX:           1804 [pixels]
Y_MAX:           1711 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00623158000msufc0855.fits
SUN_POSTN:       281.44d {+18h 45m 46s}  -23.02d {-23d 01' 11"}
SUN_DIST:         66.73 [deg]   Sun_angle= -2.1 [hr] (East of Sun)
MOON_POSTN:       52.79d {+03h 31m 09s}  +15.75d {+15d 44' 54"}
MOON_DIST:        88.35 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:       78.68, -4.68 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      330.85, 51.56 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 01 Jan 15 06:46:32 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     623158,   Seg_Num: 0
POINT_RA:        312.647d {+20h 50m 35s} (J2000)
POINT_DEC:       +36.742d {+36d 44' 30"} (J2000)
POINT_ROLL:      211.311d
IMG_START_DATE:  17023 TJD;     1 DOY;   15/01/01
IMG_START_TIME:  24188.83 SOD {06:43:08.83} UT,   855.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.495
N_STARS:         190
X_OFFSET:        365 [pixels]
Y_OFFSET:        272 [pixels]
X_MAX:           1804 [pixels]
Y_MAX:           1711 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00623158000msufc0855.fits
SUN_POSTN:       281.44d {+18h 45m 46s}  -23.02d {-23d 01' 11"}
SUN_DIST:         66.73 [deg]   Sun_angle= -2.1 [hr] (East of Sun)
MOON_POSTN:       52.79d {+03h 31m 10s}  +15.75d {+15d 44' 56"}
MOON_DIST:        88.35 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:       78.68, -4.68 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      330.85, 51.56 [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:     Thu 01 Jan 15 06:48:13 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     623158,   Seg_Num: 0
POINT_RA:        312.647d {+20h 50m 35s} (J2000)
POINT_DEC:       +36.742d {+36d 44' 30"} (J2000)
ROLL:            211.311d
IMG_START_DATE:  17023 TJD;     1 DOY;   15/01/01
IMG_START_TIME:  24188.83 SOD {06:43:08.83} UT,   855.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     441787401
X_OFFSET:        924 [pixels]
Y_OFFSET:        831 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1084
Y_GRB_POS:       991
BINNING_INDEX:   1
IM_URL:          sw00623158000msuni0868.fits
SUN_POSTN:       281.44d {+18h 45m 46s}  -23.02d {-23d 01' 11"}
SUN_DIST:         66.73 [deg]   Sun_angle= -2.1 [hr] (East of Sun)
MOON_POSTN:       52.81d {+03h 31m 14s}  +15.75d {+15d 45' 06"}
MOON_DIST:        88.36 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:       78.68, -4.68 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      330.85, 51.56 [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:     Thu 01 Jan 15 06:48:21 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     623158,   Seg_Num: 0
POINT_RA:        312.647d {+20h 50m 35s} (J2000)
POINT_DEC:       +36.742d {+36d 44' 30"} (J2000)
ROLL:            211.311d
IMG_START_DATE:  17023 TJD;     1 DOY;   15/01/01
IMG_START_TIME:  24188.83 SOD {06:43:08.83} UT,   855.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     441787401
X_OFFSET:        924 [pixels]
Y_OFFSET:        831 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1084
Y_GRB_POS:       991
BINNING_INDEX:   1
IM_URL:          sw00623158000msuni0868.fits
SUN_POSTN:       281.44d {+18h 45m 46s}  -23.02d {-23d 01' 11"}
SUN_DIST:         66.73 [deg]   Sun_angle= -2.1 [hr] (East of Sun)
MOON_POSTN:       52.81d {+03h 31m 14s}  +15.75d {+15d 45' 07"}
MOON_DIST:        88.36 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:       78.68, -4.68 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      330.85, 51.56 [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 #17261
A. Vargas (PSU), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (NASA/UMBC), H. A. Krimm (CRESST/GSFC/USRA), B. Sbarufatti (INAF-OAB/PSU) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 06:28:53 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 150101A (trigger=623158). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 312.631, +36.728 which is
```
   RA(J2000) = 20h 50m 31s
   Dec(J2000) = +36d 43' 39"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 0.1 sec. The peak count rate was ~3700 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 06:29:54.4 UT, 60.9 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 312.6038, 36.7334 which is equivalent to:
```
   RA(J2000)  = 20h 50m 24.91s
   Dec(J2000) = +36d 44' 00.3"
```
with an uncertainty of 3.9 arcseconds (radius, 90% containment). This location is 80 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. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 4.62 x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 65 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 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. Because of the density of catalogued stars, further analysis is required to report an upper limit for any afterglow in the region. No correction has been made for the large, but uncertain extinction expected.
Burst Advocate for this burst is A. Vargas (vargas.09242011.angie AT gmail.com). 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 #17262
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 1496 s of XRT Photon Counting mode data and 2 UVOT images for GRB 150101A, 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 = 312.60337, +36.73318 which is equivalent to:
```
RA (J2000): 20h 50m 24.81s
Dec (J2000): +36d 43' 59.5"
```
with an uncertainty of 2.7 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #17263
F. E. Marshall (NASA/GSFC) and A. Vargas (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 150101A 65 s after the BAT trigger (Vargas et al., GCN Circ. 17261). No optical afterglow consistent with the XRT position (Goad et al. GCN Circ. 17262) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposures and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC            65          215          147         >21.4
u_FC               277          527          246         >20.6
white               65         1524          392         >22.1
v                  607         1574          117         >20.1
b                  533         1500           97         >20.4
u                  277         1475          324         >21.0
w1                 656         1451           97         >19.4
m2                 631         1425           97         >19.9
w2                 583         1550          117         >20.4
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.52 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #17264
B. Sbarufatti (INAF-OAB/PSU), V. Mangano (PSU), M.C. Stroh (PSU), D.N. Burrows (PSU), C. Pagani (U. Leicester), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC) and A. Vargas report on behalf of the Swift-XRT team:
We have analysed 8.5 ks of XRT data for GRB 150101A (Vargas et al. GCN Circ. 17261), from 68 s to 18.8 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 17262). The source is fading with alpha >0.6.
If the light curve continues to decay with a power-law decay index of , the count rate at T+24 hours will be 7.9 x 10^-5 count s^-1
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00623158.
This circular is an official product of the Swift-XRT team.
GCN Circular #17265
O.J. Roberts (UCD) reports on behalf of the Fermi GBM Team:
"At 06:28:53.76 UT on the 1st of January 2015, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 150101A (trigger 441786536 / 150101270). The GBM on-ground location, using the Fermi GBM trigger data, is consistent with the enhanced Swift XRT position (Goad et al. 2015, GCN 17262).
The angle from the Fermi LAT boresight is about 12 degrees.
The GBM light curve consists of a single quick pulse with a duration (T90) of about 0.24 s (50-300 keV). The time-averaged spectrum from T0-0.13 s to T0+13 s is adequately fit by a power law function. The power law index is -1.5 +/- 0.1. The event fluence (10-1000 keV) in this time interval is (9.9 +/- 2.0)E-08 erg/cm^2. The 64 ms peak photon flux measured starting from T0-0.1 s in the 10-1000 keV band is 5.3 +/- 1.1 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #17266
W. H. Baumgartner (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings, N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec, we report further analysis of BAT GRB 150101A (trigger #623158) (Vargas, et al., GCN Circ. 17261). The BAT ground-calculated position is RA, Dec = 312.599, 36.669 deg which is
```
    RA(J2000)  =  20h 50m 23.6s
    Dec(J2000) = +36d 40' 07.8"
```
with an uncertainty of 2.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 91%.
The mask-weighted light curve shows a single peak. T90 (15-350 keV) is 0.060 +- 0.005 sec (estimated error including systematics).
The time-averaged spectrum from T+0.0 to T+0.68 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.26 +- 0.31. The fluence in the 15-150 keV band is (2.3 +- 0.5) x 10^-08 erg/cm2. The 1-sec peak photon flux measured from T-0.46 sec in the 15-150 keV band is 0.3 +- 0.1 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/623158/BA/

Back to JG's homepage

Jochen Greiner, last update: 02-Jan-2015 [Disclaimer]