Gamma-ray Burst 151111A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 11 Nov 15 08:33:40 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     663074,   Seg_Num: 0
GRB_RA:           56.828d {+03h 47m 19s} (J2000),
                  56.960d {+03h 47m 50s} (current),
                  56.414d {+03h 45m 39s} (1950)
GRB_DEC:         -44.164d {-44d 09' 49"} (J2000),
                 -44.116d {-44d 06' 55"} (current),
                 -44.317d {-44d 19' 00"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       3989 [cnts]    Image_Peak=210 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       23308 [cnts]
BKG_TIME:        30784.60 SOD {08:33:04.60} UT
BKG_DUR:         8 [sec]
GRB_DATE:        17337 TJD;   315 DOY;   15/11/11
GRB_TIME:        30803.41 SOD {08:33:23.41} UT
GRB_PHI:         170.30 [deg]
GRB_THETA:        27.50 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     17.29 [sigma]
IMAGE_SIGNIF:    8.94 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  -1  +0  +0 +46  +0 
SUN_POSTN:       226.17d {+15h 04m 40s}  -17.37d {-17d 21' 54"}
SUN_DIST:        117.73 [deg]   Sun_angle= 11.3 [hr] (West of Sun)
MOON_POSTN:      223.05d {+14h 52m 12s}  -12.82d {-12d 49' 22"}
MOON_DIST:       121.67 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      250.61,-51.00 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       34.90,-61.41 [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 = 221.77,11.36 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(3.0<100sec) coincident with the FERMI_GBM event (trignum=468923604).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 11 Nov 15 08:33:47 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     468923604
GRB_RA:           69.933d {+04h 39m 44s} (J2000),
                  70.061d {+04h 40m 15s} (current),
                  69.532d {+04h 38m 08s} (1950)
GRB_DEC:         -42.400d {-42d 23' 59"} (J2000),
                 -42.370d {-42d 22' 10"} (current),
                 -42.496d {-42d 29' 46"} (1950)
GRB_ERROR:       17.48 [deg radius, statistical plus systematic]
GRB_INTEN:       79 [cnts/sec]
DATA_SIGNIF:     5.70 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        17337 TJD;   315 DOY;   15/11/11
GRB_TIME:        30800.03 SOD {08:33:20.03} UT
GRB_PHI:         243.00 [deg]
GRB_THETA:        40.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.50
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      52%  GRB
2nd_MOST_LIKELY:  45%  Distant Particles
DETECTORS:       0,0,0, 0,0,0, 0,1,1, 0,0,0, 0,0,
SUN_POSTN:       226.17d {+15h 04m 40s}  -17.37d {-17d 21' 54"}
SUN_DIST:        116.33 [deg]   Sun_angle= 10.4 [hr] (West of Sun)
MOON_POSTN:      223.05d {+14h 52m 12s}  -12.82d {-12d 49' 23"}
MOON_DIST:       119.49 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      246.87,-41.66 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       55.46,-63.45 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2015/bn151111356/quicklook/glg_lc_medres34_bn151111356.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 299.60,25.03 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(3.0<100sec) coincident with the SWIFT_BAT event (trignum=663074).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 11 Nov 15 08:34:05 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     468923604
GRB_RA:           55.230d {+03h 40m 55s} (J2000),
                  55.379d {+03h 41m 31s} (current),
                  54.760d {+03h 39m 02s} (1950)
GRB_DEC:         -36.760d {-36d 45' 35"} (J2000),
                 -36.710d {-36d 42' 34"} (current),
                 -36.920d {-36d 55' 10"} (1950)
GRB_ERROR:       11.36 [deg radius, statistical only]
DATA_SIGNIF:     8.60 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        17337 TJD;   315 DOY;   15/11/11
GRB_TIME:        30800.03 SOD {08:33:20.03} UT
GRB_PHI:         234.00 [deg]
GRB_THETA:        51.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       226.17d {+15h 04m 40s}  -17.37d {-17d 21' 54"}
SUN_DIST:        125.23 [deg]   Sun_angle= 11.4 [hr] (West of Sun)
MOON_POSTN:      223.05d {+14h 52m 12s}  -12.82d {-12d 49' 25"}
MOON_DIST:       129.12 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      238.88,-53.10 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       38.68,-54.18 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2015/bn151111356/quicklook/glg_lc_medres34_bn151111356.gif
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(3.0<100sec) coincident with the SWIFT_BAT event (trignum=663074).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 11 Nov 15 08:35:15 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     663074,   Seg_Num: 0
GRB_RA:           56.8441d {+03h 47m 22.58s} (J2000),
                  56.9755d {+03h 47m 54.12s} (current),
                  56.4300d {+03h 45m 43.19s} (1950)
GRB_DEC:         -44.1602d {-44d 09' 36.7"} (J2000),
                 -44.1120d {-44d 06' 43.1"} (current),
                 -44.3133d {-44d 18' 47.9"} (1950)
GRB_ERROR:       5.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.85e-09 [erg/cm2/sec]
GRB_SIGNIF:      7.28 [sigma]
IMG_START_DATE:  17337 TJD;   315 DOY;   15/11/11
IMG_START_TIME:  30875.89 SOD {08:34:35.89} UT,   72.5 [sec] since BAT Trigger Time
TAM[0-3]:        327.65 237.21 261.65 243.73
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       226.17d {+15h 04m 40s}  -17.37d {-17d 21' 55"}
SUN_DIST:        117.73 [deg]   Sun_angle= 11.3 [hr] (West of Sun)
MOON_POSTN:      223.06d {+14h 52m 15s}  -12.83d {-12d 49' 33"}
MOON_DIST:       121.67 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      250.60,-50.99 [deg] galactic lon,lat of the burst
ECL_COORDS:       34.92,-61.41 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.72 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 11 Nov 15 08:35:25 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     663074,   Seg_Num: 0
GRB_RA:           56.8441d {+03h 47m 22.5s} (J2000),
                  56.9755d {+03h 47m 54.1s} (current),
                  56.4300d {+03h 45m 43.1s} (1950)
GRB_DEC:         -44.1602d {-44d 09' 36.7"} (J2000),
                 -44.1120d {-44d 06' 43.1"} (current),
                 -44.3133d {-44d 18' 47.9"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       53 [cnts]
IMG_START_DATE:  17337 TJD;   315 DOY;   15/11/11
IMG_START_TIME:  30875.89 SOD {08:34:35.89} UT,   72.5 [sec] since BAT Trigger Time
CENTROID_X:      313.59,  raw= 314  [pixels]
CENTROID_Y:      318.71,  raw= 319  [pixels]
ROLL:            168.50 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   49.29
GRB_POS_XRT_Z:   19.56
IMAGE_URL:       sw00663074000msxps_rw.img
SUN_POSTN:       226.17d {+15h 04m 40s}  -17.37d {-17d 21' 55"}
SUN_DIST:        117.73 [deg]   Sun_angle= 11.3 [hr] (West of Sun)
MOON_POSTN:      223.06d {+14h 52m 15s}  -12.83d {-12d 49' 34"}
MOON_DIST:       121.67 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      250.60,-50.99 [deg] galactic lon,lat of the burst
ECL_COORDS:       34.92,-61.41 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 11 Nov 15 08:35:32 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     663074,   Seg_Num: 0
GRB_RA:           56.8441d {+03h 47m 22.5s} (J2000),
                  56.9755d {+03h 47m 54.1s} (current),
                  56.4300d {+03h 45m 43.1s} (1950)
GRB_DEC:         -44.1602d {-44d 09' 36.7"} (J2000),
                 -44.1120d {-44d 06' 43.1"} (current),
                 -44.3133d {-44d 18' 47.9"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       53 [cnts]
IMG_START_DATE:  17337 TJD;   315 DOY;   15/11/11
IMG_START_TIME:  30875.89 SOD {08:34:35.89} UT,   72.5 [sec] since BAT Trigger Time
CENTROID_X:      313.59,  raw= 314  [pixels]
CENTROID_Y:      318.71,  raw= 319  [pixels]
ROLL:            168.50 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   49.29
GRB_POS_XRT_Z:   19.56
IMAGE_URL:       sw00663074000msxps_rw.img
SUN_POSTN:       226.17d {+15h 04m 40s}  -17.37d {-17d 21' 55"}
SUN_DIST:        117.73 [deg]   Sun_angle= 11.3 [hr] (West of Sun)
MOON_POSTN:      223.06d {+14h 52m 15s}  -12.83d {-12d 49' 35"}
MOON_DIST:       121.67 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      250.60,-50.99 [deg] galactic lon,lat of the burst
ECL_COORDS:       34.92,-61.41 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 11 Nov 15 08:37:09 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     663074,   Seg_Num: 0
GRB_RA:           56.828d {+03h 47m 19s} (J2000),
                  56.960d {+03h 47m 50s} (current),
                  56.414d {+03h 45m 39s} (1950)
GRB_DEC:         -44.164d {-44d 09' 49"} (J2000),
                 -44.116d {-44d 06' 55"} (current),
                 -44.317d {-44d 19' 00"} (1950)
GRB_DATE:        17337 TJD;   315 DOY;   15/11/11
GRB_TIME:        30803.41 SOD {08:33:23.41} UT
TRIGGER_INDEX:   146
GRB_PHI:         170.30 [deg]
GRB_THETA:        27.50 [deg]
DELTA_TIME:      39.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     17.29 [sigma]
IMAGE_SIGNIF:    8.94 [sigma]
LC_URL:          sw00663074000msb.lc
SUN_POSTN:       226.17d {+15h 04m 41s}  -17.37d {-17d 21' 56"}
SUN_DIST:        117.73 [deg]   Sun_angle= 11.3 [hr] (West of Sun)
MOON_POSTN:      223.08d {+14h 52m 19s}  -12.83d {-12d 49' 46"}
MOON_DIST:       121.67 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      250.61,-51.00 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       34.90,-61.41 [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 = 221.77,11.36 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 11 Nov 15 08:37:50 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     663074,   Seg_Num: 0
POINT_RA:         56.828d {+03h 47m 19s} (J2000)
POINT_DEC:       -44.168d {-44d 10' 05"} (J2000)
POINT_ROLL:      168.501d
IMG_START_DATE:  17337 TJD;   315 DOY;   15/11/11
IMG_START_TIME:  30884.56 SOD {08:34:44.56} UT,   81.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.378
N_STARS:         28
X_OFFSET:        432 [pixels]
Y_OFFSET:        536 [pixels]
X_MAX:           1391 [pixels]
Y_MAX:           1495 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00663074000msufc0081.fits
SUN_POSTN:       226.17d {+15h 04m 41s}  -17.37d {-17d 21' 57"}
SUN_DIST:        117.73 [deg]   Sun_angle= 11.3 [hr] (West of Sun)
MOON_POSTN:      223.08d {+14h 52m 20s}  -12.83d {-12d 49' 51"}
MOON_DIST:       121.66 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      250.62,-51.00 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       34.89,-61.41 [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:     Wed 11 Nov 15 08:37:30 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     663074,   Seg_Num: 0
POINT_RA:         56.828d {+03h 47m 19s} (J2000)
POINT_DEC:       -44.168d {-44d 10' 05"} (J2000)
POINT_ROLL:      168.501d
IMG_START_DATE:  17337 TJD;   315 DOY;   15/11/11
IMG_START_TIME:  30884.56 SOD {08:34:44.56} UT,   81.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.378
N_STARS:         28
X_OFFSET:        432 [pixels]
Y_OFFSET:        536 [pixels]
X_MAX:           1391 [pixels]
Y_MAX:           1495 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00663074000msufc0081.fits
SUN_POSTN:       226.17d {+15h 04m 41s}  -17.37d {-17d 21' 56"}
SUN_DIST:        117.73 [deg]   Sun_angle= 11.3 [hr] (West of Sun)
MOON_POSTN:      223.08d {+14h 52m 19s}  -12.83d {-12d 49' 48"}
MOON_DIST:       121.66 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      250.62,-51.00 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       34.89,-61.41 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 11 Nov 15 08:38:54 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     663074,   Seg_Num: 0
POINT_RA:         56.828d {+03h 47m 19s} (J2000)
POINT_DEC:       -44.168d {-44d 10' 05"} (J2000)
ROLL:            168.501d
IMG_START_DATE:  17337 TJD;   315 DOY;   15/11/11
IMG_START_TIME:  30884.56 SOD {08:34:44.56} UT,   81.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     468923699
X_OFFSET:        705 [pixels]
Y_OFFSET:        793 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       865
Y_GRB_POS:       953
BINNING_INDEX:   1
IM_URL:          sw00663074000msuni0097.fits
SUN_POSTN:       226.17d {+15h 04m 41s}  -17.37d {-17d 21' 57"}
SUN_DIST:        117.73 [deg]   Sun_angle= 11.3 [hr] (West of Sun)
MOON_POSTN:      223.09d {+14h 52m 22s}  -12.83d {-12d 49' 58"}
MOON_DIST:       121.66 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      250.62,-51.00 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       34.89,-61.41 [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:     Wed 11 Nov 15 08:39:13 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     663074,   Seg_Num: 0
POINT_RA:         56.828d {+03h 47m 19s} (J2000)
POINT_DEC:       -44.168d {-44d 10' 05"} (J2000)
ROLL:            168.501d
IMG_START_DATE:  17337 TJD;   315 DOY;   15/11/11
IMG_START_TIME:  30884.56 SOD {08:34:44.56} UT,   81.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     468923699
X_OFFSET:        705 [pixels]
Y_OFFSET:        793 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       865
Y_GRB_POS:       953
BINNING_INDEX:   1
IM_URL:          sw00663074000msuni0097.fits
SUN_POSTN:       226.17d {+15h 04m 41s}  -17.37d {-17d 21' 58"}
SUN_DIST:        117.73 [deg]   Sun_angle= 11.3 [hr] (West of Sun)
MOON_POSTN:      223.10d {+14h 52m 23s}  -12.83d {-12d 50' 00"}
MOON_DIST:       121.66 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      250.62,-51.00 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       34.89,-61.41 [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:     Wed 11 Nov 15 08:45:16 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     663074,   Seg_Num: 0
POINT_RA:         56.824d {+03h 47m 18s} (J2000)
POINT_DEC:       -44.169d {-44d 10' 06"} (J2000)
POINT_ROLL:      168.505d
IMG_START_DATE:  17337 TJD;   315 DOY;   15/11/11
IMG_START_TIME:  31096.74 SOD {08:38:16.74} UT,   293.3 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.391
N_STARS:         13
X_OFFSET:        385 [pixels]
Y_OFFSET:        473 [pixels]
X_MAX:           1344 [pixels]
Y_MAX:           1432 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00663074000msufc0293.fits
SUN_POSTN:       226.17d {+15h 04m 42s}  -17.37d {-17d 22' 02"}
SUN_DIST:        117.73 [deg]   Sun_angle= 11.3 [hr] (West of Sun)
MOON_POSTN:      223.15d {+14h 52m 35s}  -12.85d {-12d 50' 43"}
MOON_DIST:       121.66 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      250.62,-51.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       34.88,-61.41 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 11 Nov 15 08:45:35 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     663074,   Seg_Num: 0
POINT_RA:         56.824d {+03h 47m 18s} (J2000)
POINT_DEC:       -44.169d {-44d 10' 06"} (J2000)
POINT_ROLL:      168.505d
IMG_START_DATE:  17337 TJD;   315 DOY;   15/11/11
IMG_START_TIME:  31096.74 SOD {08:38:16.74} UT,   293.3 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.391
N_STARS:         13
X_OFFSET:        385 [pixels]
Y_OFFSET:        473 [pixels]
X_MAX:           1344 [pixels]
Y_MAX:           1432 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00663074000msufc0293.fits
SUN_POSTN:       226.17d {+15h 04m 42s}  -17.37d {-17d 22' 02"}
SUN_DIST:        117.73 [deg]   Sun_angle= 11.3 [hr] (West of Sun)
MOON_POSTN:      223.15d {+14h 52m 36s}  -12.85d {-12d 50' 45"}
MOON_DIST:       121.66 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      250.62,-51.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       34.88,-61.41 [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:     Wed 11 Nov 15 08:46:24 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     663074,   Seg_Num: 0
POINT_RA:         56.824d {+03h 47m 18s} (J2000)
POINT_DEC:       -44.169d {-44d 10' 06"} (J2000)
ROLL:            168.505d
IMG_START_DATE:  17337 TJD;   315 DOY;   15/11/11
IMG_START_TIME:  31096.74 SOD {08:38:16.74} UT,   293.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     468923912
X_OFFSET:        705 [pixels]
Y_OFFSET:        793 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       865
Y_GRB_POS:       953
BINNING_INDEX:   1
IM_URL:          sw00663074000msuni0309.fits
SUN_POSTN:       226.18d {+15h 04m 42s}  -17.37d {-17d 22' 03"}
SUN_DIST:        117.73 [deg]   Sun_angle= 11.3 [hr] (West of Sun)
MOON_POSTN:      223.16d {+14h 52m 37s}  -12.85d {-12d 50' 50"}
MOON_DIST:       121.66 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      250.62,-51.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       34.88,-61.41 [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:     Wed 11 Nov 15 08:46:41 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     663074,   Seg_Num: 0
POINT_RA:         56.824d {+03h 47m 18s} (J2000)
POINT_DEC:       -44.169d {-44d 10' 06"} (J2000)
ROLL:            168.505d
IMG_START_DATE:  17337 TJD;   315 DOY;   15/11/11
IMG_START_TIME:  31096.74 SOD {08:38:16.74} UT,   293.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     468923912
X_OFFSET:        705 [pixels]
Y_OFFSET:        793 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       865
Y_GRB_POS:       953
BINNING_INDEX:   1
IM_URL:          sw00663074000msuni0309.fits
SUN_POSTN:       226.18d {+15h 04m 42s}  -17.37d {-17d 22' 03"}
SUN_DIST:        117.73 [deg]   Sun_angle= 11.3 [hr] (West of Sun)
MOON_POSTN:      223.16d {+14h 52m 38s}  -12.85d {-12d 50' 52"}
MOON_DIST:       121.66 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      250.62,-51.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       34.88,-61.41 [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:     Wed 11 Nov 15 08:51:18 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     663074,   Seg_Num: 0
POINT_RA:         56.823d {+03h 47m 18s} (J2000)
POINT_DEC:       -44.169d {-44d 10' 06"} (J2000)
POINT_ROLL:      168.506d
IMG_START_DATE:  17337 TJD;   315 DOY;   15/11/11
IMG_START_TIME:  31675.01 SOD {08:47:55.01} UT,   871.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.328
N_STARS:         125
X_OFFSET:        145 [pixels]
Y_OFFSET:        233 [pixels]
X_MAX:           1584 [pixels]
Y_MAX:           1672 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00663074000msufc0871.fits
SUN_POSTN:       226.18d {+15h 04m 43s}  -17.37d {-17d 22' 06"}
SUN_DIST:        117.73 [deg]   Sun_angle= 11.3 [hr] (West of Sun)
MOON_POSTN:      223.20d {+14h 52m 47s}  -12.86d {-12d 51' 24"}
MOON_DIST:       121.66 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      250.62,-51.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       34.88,-61.41 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 11 Nov 15 08:51:44 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     663074,   Seg_Num: 0
GRB_RA:           56.8451d {+03h 47m 22.82s} (J2000),
                  56.9765d {+03h 47m 54.36s} (current),
                  56.4310d {+03h 45m 43.44s} (1950)
GRB_DEC:         -44.1614d {-44d 09' 41.0"} (J2000),
                 -44.1132d {-44d 06' 47.4"} (current),
                 -44.3145d {-44d 18' 52.2"} (1950)
GRB_ERROR:       2.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17337 TJD;   315 DOY;   15/11/11
IMG_START_TIME:  31168.00 SOD {08:39:28.00} UT,   364.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       226.18d {+15h 04m 43s}  -17.37d {-17d 22' 06"}
SUN_DIST:        117.73 [deg]   Sun_angle= 11.3 [hr] (West of Sun)
MOON_POSTN:      223.20d {+14h 52m 48s}  -12.86d {-12d 51' 27"}
MOON_DIST:       121.66 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      250.60,-50.99 [deg] galactic lon,lat of the burst
ECL_COORDS:       34.92,-61.41 [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 0.11% < P(seren) < 0.58%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 11 Nov 15 08:51:38 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     663074,   Seg_Num: 0
POINT_RA:         56.823d {+03h 47m 18s} (J2000)
POINT_DEC:       -44.169d {-44d 10' 06"} (J2000)
POINT_ROLL:      168.506d
IMG_START_DATE:  17337 TJD;   315 DOY;   15/11/11
IMG_START_TIME:  31675.01 SOD {08:47:55.01} UT,   871.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.328
N_STARS:         125
X_OFFSET:        145 [pixels]
Y_OFFSET:        233 [pixels]
X_MAX:           1584 [pixels]
Y_MAX:           1672 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00663074000msufc0871.fits
SUN_POSTN:       226.18d {+15h 04m 43s}  -17.37d {-17d 22' 06"}
SUN_DIST:        117.73 [deg]   Sun_angle= 11.3 [hr] (West of Sun)
MOON_POSTN:      223.20d {+14h 52m 48s}  -12.86d {-12d 51' 27"}
MOON_DIST:       121.66 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      250.62,-51.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       34.88,-61.41 [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:     Wed 11 Nov 15 08:52:37 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     663074,   Seg_Num: 0
POINT_RA:         56.823d {+03h 47m 18s} (J2000)
POINT_DEC:       -44.169d {-44d 10' 06"} (J2000)
ROLL:            168.506d
IMG_START_DATE:  17337 TJD;   315 DOY;   15/11/11
IMG_START_TIME:  31675.01 SOD {08:47:55.01} UT,   871.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     468924490
X_OFFSET:        704 [pixels]
Y_OFFSET:        792 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       864
Y_GRB_POS:       952
BINNING_INDEX:   1
IM_URL:          sw00663074000msuni0887.fits
SUN_POSTN:       226.18d {+15h 04m 43s}  -17.37d {-17d 22' 07"}
SUN_DIST:        117.73 [deg]   Sun_angle= 11.3 [hr] (West of Sun)
MOON_POSTN:      223.21d {+14h 52m 50s}  -12.86d {-12d 51' 34"}
MOON_DIST:       121.66 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      250.62,-51.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       34.88,-61.41 [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:     Wed 11 Nov 15 08:52:53 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     663074,   Seg_Num: 0
POINT_RA:         56.823d {+03h 47m 18s} (J2000)
POINT_DEC:       -44.169d {-44d 10' 06"} (J2000)
ROLL:            168.506d
IMG_START_DATE:  17337 TJD;   315 DOY;   15/11/11
IMG_START_TIME:  31675.01 SOD {08:47:55.01} UT,   871.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     468924490
X_OFFSET:        704 [pixels]
Y_OFFSET:        792 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       864
Y_GRB_POS:       952
BINNING_INDEX:   1
IM_URL:          sw00663074000msuni0887.fits
SUN_POSTN:       226.18d {+15h 04m 43s}  -17.37d {-17d 22' 07"}
SUN_DIST:        117.73 [deg]   Sun_angle= 11.3 [hr] (West of Sun)
MOON_POSTN:      223.21d {+14h 52m 51s}  -12.86d {-12d 51' 35"}
MOON_DIST:       121.66 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      250.62,-51.01 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       34.88,-61.41 [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 #18578
L. M. McCauley (PSU), P. A. Evans (U Leicester), H. A. Krimm (CRESST/GSFC/USRA), K. L. Page (U Leicester) and B. Sbarufatti (INAF-OAB/PSU) report on behalf of the Swift Team:
At 08:33:23 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 151111A (trigger=663074). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 56.828, -44.164 which is
```
   RA(J2000) = 03h 47m 19s
   Dec(J2000) = -44d 09' 49"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single FRED-like structure with a duration of about 40 sec. The peak count rate was ~2000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 08:34:35.8 UT, 72.5 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source with an enhanced position: RA, Dec 56.8452, -44.1615 which is equivalent to:
```
   RA(J2000)  = 03h 47m 22.86s
   Dec(J2000) = -44d 09' 41.3"
```
with an uncertainty of 2.1 arcseconds (radius, 90% containment). This location is 45 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 (1.07 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 2.6 (+1.82/-1.61) x 10^21 cm^-2 (90% confidence).
The initial flux in the 2.5 s image was 1.85e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 81 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 typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board 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.
Burst Advocate for this burst is L. M. McCauley (marissamc AT swift.psu.edu). 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 #18579
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 639 s of XRT Photon Counting mode data and 1 UVOT images for GRB 151111A, 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 = 56.84455, -44.16154 which is equivalent to:
```
RA (J2000): 03h 47m 22.69s
Dec (J2000): -44d 09' 41.5"
```
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 #18580
J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), L. M. McCauley (PSU), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 151111A (trigger #663074) (McCauley, et al., GCN Circ. 18578). The BAT ground-calculated position is RA, Dec = 56.850, -44.154 deg which is
```
    RA(J2000)  =  03h 47m 24.0s
    Dec(J2000) = -44d 09' 12.9"
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 80%.
The mask-weighted light curve shows a single long FRED-shaped peak beginning at T-5 sec, peaking at T+0 sec and fading to background by T+140 sec. T90 (15-350 keV) is 76.93 +- 12.59 sec (estimated error including systematics).
The time-averaged spectrum from T-5.62 to T+91.35 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 0.79 +- 0.45, and Epeak of 56.6 +- 9.2 keV (chi squared 98.19 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 1.7 +- 0.1 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+0.52 sec in the 15-150 keV band is 1.0 +- 0.1 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.76 +- 0.00 (chi squared 115.24 for 57 d.o.f.). 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/663074/BA/
GCN Circular #18581
S. Dichiara (U. Ferrara, ICRANet), C. Guidorzi (U. Ferrara), S. Kobayashi (LJMU), A. Gomboc (U. Ljubljana) on behalf of a larger collaboration report:
The 2-m LCOGT Faulkes Telescope South began observing Swift GRB 151111A (McCauley et al. GCN 18578) on November 11, 10:45 UT (2.2 hours after the burst trigger) with SDSS R and I filters under poor sky conditions. We do not detect any optical afterglow candidate within the enhanced Swift-XRT error circle (Goad et al. GCN 18579) with the following magnitudes:
```
Mid Time      Exposure       Filter       Magnitude
(hours)           (s)
-------------------------------------------------------
3.5            10x120         R           > 20.5
4.2             9x120         I           > 20.0
-------------------------------------------------------
```
Calibration is done against nearby USNOB-1 stars using R2 and I nominal magnitudes. We note in both filters the presence of a possible source of R~21 mag at the following position: RA(J2000)=03:47:22.75, DEC(J2000)=-44:09:43.6 (error radius of 1.5"). We caution that the detection is not significant, so we cannot rule out the possibility that it is a fluke.
GCN Circular #18582
E.Bissaldi (INFN Bari) and P.N. Bhat (UAH) report on behalf of the Fermi GBM Team:
"At 08:33:20.03 UT on 11 November 2015, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 151111A (trigger 468923604 / 151111356), which was also detected by the Swift/BAT (McCauley et al. 2015, GCN 18578). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 50 degrees. The GBM light curve consists of a single FRED-like episode with a duration (T90) of about 40 s (50-300 keV). The time-averaged spectrum from T0-2 s to T0+30 s is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is 0.0 =EF=BF=BD 0.2 and the cutoff energy, parameterized as Epeak, is 107 =EF=BF=BD 8 keV.
The event fluence (10-1000 keV) in this time interval is (2.05 =EF=BF=BD 0.13)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+0.2 s in the 10-1000 keV band is 1.41 =EF=BF=BD 0.17 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #18583
D.N. Burrows (PSU), T.G.R. Roegiers (PSU), S.L. Gibson (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC) and L.M. McCauley report on behalf of the Swift-XRT team:
We have analysed 16 ks of XRT data for GRB 151111A (McCauley et al. GCN Circ. 18578), from 63 s to 45.5 ks after the BAT trigger. The data comprise 284 s in Windowed Timing (WT) mode (the first 8 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 18579).
The late-time light curve (from T0+5.3 ks) can be modelled with a power-law decay with a decay index of alpha=1.2 (+/-0.4).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.28 (+/-0.05). The best-fitting absorption column is 3.7 (+1.9, -1.7) x 10^20 cm^-2, in excess of the Galactic value of 1.1 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.74 (+0.19, -0.18) and a best-fitting absorption column of 5.0 (+4.8, -3.9) x 10^20 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.7 x 10^-11 (4.1 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     5.0 (+4.8, -3.9) x 10^20 cm^-2
Galactic foreground: 1.1 x 10^20 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.74 (+0.19, -0.18)
```
If the light curve continues to decay with a power-law decay index of 1.2, the count rate at T+24 hours will be 2.1 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 7.8 x 10^-14 (8.4 x 10^-14) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00663074.
This circular is an official product of the Swift-XRT team.
GCN Circular #18585
J. F. Graham, T. Schweyer, and J. Greiner (all MPE Garching) report:
We observed the field of GRB 151111A (Swift trigger 663074; Page et al., GCN 18578) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m MPG telescope at ESO La Silla Observatory (Chile).
Observations started at 00:08:05 UT on November 12, about 16 hours after the GRB trigger. Consistent with the enhanced X-ray error circle (Evans et al., GCN 18579) and the LCOGT-FTS possible source (Dichiara et al., GCN 18581) we detect a faint source at coordinates RA, DEC (J2000) = 03:47:22.73, -44:09:43.3 with an error of 2".
Due to high winds we were able to observe the target for only a limited period in conditions of extremity poor seeing (~3") and thick cirrus. We thus give the following preliminary AB magnitudes with statistical and estimated systematic errors.
```
g: 23.25 +- 0.21 +- 1.0
r: 22.16 +- 0.14 +- 0.5
i: 20.89 +- 0.15 +- 0.5
```
At present we cannot decide if this is the afterglow. Further observations are currently precluded by high winds. We encourage additional observations from locations with better observing conditions.
Magnitudes are calibrated against the USNO-B1.0 catalog and are not corrected for the Galactic extinction in the direction of the burst.
GCN Circular #18587
M. De Pasquale, S. Emery (UCL-MSSL) and L. M. McCauley (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 151111A 81 s after the BAT trigger (McCauley et al., GCN Circ. 18578). No optical afterglow consistent with the XRT position (Goad et al. GCN Circ. 18579) 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) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)    Mag

white_FC            81          231          147    >20.9
u_FC               293          543          246    >19.7
white               81         6778          519    >21.7
v                  622         7094          339    >19.7
b                  549         6573          235    >20.6
u                  293         6367          442    >19.7
w1                 671         6163          216    >20.0
m2                5757         5957          197    >19.7
w2                 772         6984          413    >20.6
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.01 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #18598
J. Bolmer, J. Graham, F. Knust and J. Greiner (all MPE Garching) report:
We reobserved the field of GRB 151111A (Swift trigger 663074; Page et al., GCN 18578) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m MPG telescope at ESO La Silla Observatory (Chile).
Observations started at 05:31:33 UT on November 13, about 1.9 days after the GRB trigger. The initially reported source at the coordinates of RA, Dec = 56.84483, -44.16201 (+/- 0.2") (Graham et al. GCN 18585) has clearly faded (e.g. in the r' band from 22.19 +/- 0.04 to 22.68 +/- 0.05 mag) and we thus conclude that this source is the optical afterglow of GRB 151111A.
Furthermore, after correcting for the galactic foregorund E(B-V)=0.01 mag, and fitting a powerlaw model to the 7-cannel GROND SED from the first night, we derive a photometric redshift of z = 3.5 +/- 0.3, according to the g'-band dropout with g'-r' = 1.3 mag.

Back to JG's homepage

Jochen Greiner, last update: 13-Nov-2015 [Disclaimer]