Gamma-ray Burst 071112C

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Nov 07 18:33:52 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     296504,   Seg_Num: 0
GRB_RA:           39.220d {+02h 36m 53s} (J2000),
                  39.336d {+02h 37m 21s} (current),
                  38.486d {+02h 33m 57s} (1950)
GRB_DEC:         +28.381d {+28d 22' 50"} (J2000),
                 +28.414d {+28d 24' 52"} (current),
                 +28.164d {+28d 09' 49"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       1638 [cnts]    Image_Peak=103 [image_cnts]
TRIGGER_DUR:     0.256 [sec] 
TRIGGER_INDEX:   126     E_range: 50-350 keV
BKG_INTEN:       24093 [cnts]
BKG_TIME:        66765.64 SOD {18:32:45.64} UT
BKG_DUR:         8 [sec]
GRB_DATE:        14416 TJD;   316 DOY;   07/11/12
GRB_TIME:        66777.54 SOD {18:32:57.54} UT
GRB_PHI:         112.64 [deg]
GRB_THETA:        24.48 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     30.69 [sigma]
IMAGE_SIGNIF:    7.59 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +3 +20  +0  +0 +97  +1 
SUN_POSTN:       227.54d {+15h 10m 10s}  -17.74d {-17d 44' 13"}
SUN_DIST:        166.93 [deg]   Sun_angle= -11.5 [hr] (East of Sun)
MOON_POSTN:      259.73d {+17h 18m 54s}  -27.90d {-27d 54' 00"}
MOON_DIST:       144.56 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      149.46,-29.00 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       45.74, 12.40 [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 = 44.69,15.28 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Nov 07 18:35:00 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     296504,   Seg_Num: 0
GRB_RA:           39.2125d {+02h 36m 50.9s} (J2000),
                  39.3282d {+02h 37m 18.7s} (current),
                  38.4781d {+02h 33m 54.7s} (1950)
GRB_DEC:         +28.3719d {+28d 22' 18.8"} (J2000),
                 +28.4058d {+28d 24' 20.8"} (current),
                 +28.1551d {+28d 09' 18.2"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       56 [cnts]
IMG_START_DATE:  14416 TJD;   316 DOY;   07/11/12
IMG_START_TIME:  66861.14 SOD {18:34:21.14} UT,   83.6 [sec] since BAT Trigger Time
CENTROID_X:      346.74,  raw= 347  [pixels]
CENTROID_Y:      330.23,  raw= 330  [pixels]
ROLL:            322.51 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   75.99
GRB_POS_XRT_Z:   104.76
IMAGE_URL:       sw00296504000msxps_rw.img
SUN_POSTN:       227.54d {+15h 10m 11s}  -17.74d {-17d 44' 14"}
SUN_DIST:        166.94 [deg]   Sun_angle= -11.5 [hr] (East of Sun)
MOON_POSTN:      259.74d {+17h 18m 57s}  -27.90d {-27d 54' 01"}
MOON_DIST:       144.54 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      149.46,-29.01 [deg] galactic lon,lat of the burst
ECL_COORDS:       45.73, 12.40 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Nov 07 18:34:53 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     296504,   Seg_Num: 0
GRB_RA:           39.2125d {+02h 36m 50.9s} (J2000),
                  39.3282d {+02h 37m 18.7s} (current),
                  38.4781d {+02h 33m 54.7s} (1950)
GRB_DEC:         +28.3719d {+28d 22' 18.8"} (J2000),
                 +28.4058d {+28d 24' 20.8"} (current),
                 +28.1551d {+28d 09' 18.2"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       56 [cnts]
IMG_START_DATE:  14416 TJD;   316 DOY;   07/11/12
IMG_START_TIME:  66861.14 SOD {18:34:21.14} UT,   83.6 [sec] since BAT Trigger Time
CENTROID_X:      346.74,  raw= 347  [pixels]
CENTROID_Y:      330.23,  raw= 330  [pixels]
ROLL:            322.51 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   75.99
GRB_POS_XRT_Z:   104.76
IMAGE_URL:       sw00296504000msxps_rw.img
SUN_POSTN:       227.54d {+15h 10m 11s}  -17.74d {-17d 44' 14"}
SUN_DIST:        166.94 [deg]   Sun_angle= -11.5 [hr] (East of Sun)
MOON_POSTN:      259.73d {+17h 18m 56s}  -27.90d {-27d 54' 01"}
MOON_DIST:       144.54 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      149.46,-29.01 [deg] galactic lon,lat of the burst
ECL_COORDS:       45.73, 12.40 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

 
TITLE:           GCN/SWIFT NOTICE 
NOTICE_DATE:     Mon 12 Nov 07 18:34:51 UT 
NOTICE_TYPE:     Swift-XRT Position 
TRIGGER_NUM:     296504,   Seg_Num: 0 
GRB_RA:           39.2125d {+02h 36m 50.9s} (J2000), 
                  39.3282d {+02h 37m 18.7s} (current), 
                  38.4781d {+02h 33m 54.7s} (1950) 
GRB_DEC:         +28.3719d {+28d 22' 18.8"} (J2000), 
                 +28.4058d {+28d 24' 20.8"} (current), 
                 +28.1551d {+28d 09' 18.2"} (1950) 
GRB_ERROR:       5.4 [arcsec radius, statistical plus systematic, 90% containment] 
GRB_INTEN:       1.25e-09 [erg/cm2/sec] 
GRB_SIGNIF:      7.48 [sigma] 
IMG_START_DATE:  14416 TJD;   316 DOY;   07/11/12 
IMG_START_TIME:  66861.14 SOD {18:34:21.14} UT,   83.6 [sec] since BAT Trigger Time 
TAM[0-3]:        327.64 237.24 261.36 243.49 
AMPLIFIER:       2 
WAVEFORM:        134 
SUN_POSTN:       227.54d {+15h 10m 11s}  -17.74d {-17d 44' 14"} 
SUN_DIST:        166.94 [deg]   Sun_angle= -11.5 [hr] (East of Sun) 
MOON_POSTN:      259.73d {+17h 18m 56s}  -27.90d {-27d 54' 01"} 
MOON_DIST:       144.54 [deg] 
MOON_ILLUM:      7 [%] 
GAL_COORDS:      149.46,-29.01 [deg] galactic lon,lat of the burst 
ECL_COORDS:       45.73, 12.40 [deg] ecliptic lon,lat of the burst 
COMMENTS:        SWIFT-XRT Coordinates.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Nov 07 18:36:37 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     296504,   Seg_Num: 0
POINT_RA:         39.211d {+02h 36m 51s} (J2000)
POINT_DEC:       +28.408d {+28d 24' 27"} (J2000)
POINT_ROLL:      322.505d
IMG_START_DATE:  14416 TJD;   316 DOY;   07/11/12
IMG_START_TIME:  66869.61 SOD {18:34:29.61} UT,   92.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.855
N_STARS:         37
X_OFFSET:        264 [pixels]
Y_OFFSET:        568 [pixels]
X_MAX:           1223 [pixels]
Y_MAX:           1527 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00296504000msufc0092.fits
SUN_POSTN:       227.55d {+15h 10m 11s}  -17.74d {-17d 44' 15"}
SUN_DIST:        166.91 [deg]   Sun_angle= -11.4 [hr] (East of Sun)
MOON_POSTN:      259.75d {+17h 19m 00s}  -27.90d {-27d 54' 03"}
MOON_DIST:       144.53 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      149.44,-28.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       45.74, 12.43 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Nov 07 18:37:05 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     296504,   Seg_Num: 0
POINT_RA:         39.211d {+02h 36m 51s} (J2000)
POINT_DEC:       +28.408d {+28d 24' 27"} (J2000)
POINT_ROLL:      322.505d
IMG_START_DATE:  14416 TJD;   316 DOY;   07/11/12
IMG_START_TIME:  66869.61 SOD {18:34:29.61} UT,   92.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.855
N_STARS:         37
X_OFFSET:        264 [pixels]
Y_OFFSET:        568 [pixels]
X_MAX:           1223 [pixels]
Y_MAX:           1527 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00296504000msufc0092.fits
SUN_POSTN:       227.55d {+15h 10m 11s}  -17.74d {-17d 44' 15"}
SUN_DIST:        166.91 [deg]   Sun_angle= -11.4 [hr] (East of Sun)
MOON_POSTN:      259.76d {+17h 19m 01s}  -27.90d {-27d 54' 04"}
MOON_DIST:       144.53 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      149.44,-28.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       45.74, 12.43 [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 12 Nov 07 18:37:57 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     296504,   Seg_Num: 0
POINT_RA:         39.211d {+02h 36m 51s} (J2000)
POINT_DEC:       +28.408d {+28d 24' 27"} (J2000)
ROLL:            322.505d
IMG_START_DATE:  14416 TJD;   316 DOY;   07/11/12
IMG_START_TIME:  66869.61 SOD {18:34:29.61} UT,   92.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     216585271
X_OFFSET:        533 [pixels]
Y_OFFSET:        835 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       693
Y_GRB_POS:       995
BINNING_INDEX:   1
IM_URL:          sw00296504000msuni0092.fits
SUN_POSTN:       227.55d {+15h 10m 11s}  -17.74d {-17d 44' 16"}
SUN_DIST:        166.91 [deg]   Sun_angle= -11.4 [hr] (East of Sun)
MOON_POSTN:      259.76d {+17h 19m 03s}  -27.90d {-27d 54' 05"}
MOON_DIST:       144.52 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      149.44,-28.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       45.74, 12.43 [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 12 Nov 07 18:38:23 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     296504,   Seg_Num: 0
POINT_RA:         39.211d {+02h 36m 51s} (J2000)
POINT_DEC:       +28.408d {+28d 24' 27"} (J2000)
ROLL:            322.505d
IMG_START_DATE:  14416 TJD;   316 DOY;   07/11/12
IMG_START_TIME:  66869.61 SOD {18:34:29.61} UT,   92.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     216585271
X_OFFSET:        533 [pixels]
Y_OFFSET:        835 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       693
Y_GRB_POS:       995
BINNING_INDEX:   1
IM_URL:          sw00296504000msuni0092.fits
SUN_POSTN:       227.55d {+15h 10m 11s}  -17.74d {-17d 44' 16"}
SUN_DIST:        166.91 [deg]   Sun_angle= -11.4 [hr] (East of Sun)
MOON_POSTN:      259.77d {+17h 19m 04s}  -27.90d {-27d 54' 06"}
MOON_DIST:       144.52 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      149.44,-28.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       45.74, 12.43 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_sources_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Nov 07 18:43:21 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     296504,   Seg_Num: 0
POINT_RA:         39.213d {+02h 36m 51s} (J2000)
POINT_DEC:       +28.409d {+28d 24' 32"} (J2000)
POINT_ROLL:      322.508d
IMG_START_DATE:  14416 TJD;   316 DOY;   07/11/12
IMG_START_TIME:  66975.62 SOD {18:36:15.62} UT,   198.1 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.748
N_STARS:         51
X_OFFSET:        213 [pixels]
Y_OFFSET:        515 [pixels]
X_MAX:           1172 [pixels]
Y_MAX:           1474 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00296504000msufc0198.fits
SUN_POSTN:       227.55d {+15h 10m 12s}  -17.74d {-17d 44' 19"}
SUN_DIST:        166.90 [deg]   Sun_angle= -11.4 [hr] (East of Sun)
MOON_POSTN:      259.81d {+17h 19m 15s}  -27.90d {-27d 54' 13"}
MOON_DIST:       144.48 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      149.44,-28.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       45.74, 12.43 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Nov 07 18:43:53 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     296504,   Seg_Num: 0
POINT_RA:         39.213d {+02h 36m 51s} (J2000)
POINT_DEC:       +28.409d {+28d 24' 32"} (J2000)
POINT_ROLL:      322.508d
IMG_START_DATE:  14416 TJD;   316 DOY;   07/11/12
IMG_START_TIME:  66975.62 SOD {18:36:15.62} UT,   198.1 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.748
N_STARS:         51
X_OFFSET:        213 [pixels]
Y_OFFSET:        515 [pixels]
X_MAX:           1172 [pixels]
Y_MAX:           1474 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00296504000msufc0198.fits
SUN_POSTN:       227.55d {+15h 10m 12s}  -17.74d {-17d 44' 20"}
SUN_DIST:        166.90 [deg]   Sun_angle= -11.4 [hr] (East of Sun)
MOON_POSTN:      259.82d {+17h 19m 17s}  -27.90d {-27d 54' 13"}
MOON_DIST:       144.47 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      149.44,-28.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       45.74, 12.43 [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 12 Nov 07 18:44:38 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     296504,   Seg_Num: 0
POINT_RA:         39.213d {+02h 36m 51s} (J2000)
POINT_DEC:       +28.409d {+28d 24' 32"} (J2000)
ROLL:            322.508d
IMG_START_DATE:  14416 TJD;   316 DOY;   07/11/12
IMG_START_TIME:  66975.62 SOD {18:36:15.62} UT,   198.1 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     216585377
X_OFFSET:        533 [pixels]
Y_OFFSET:        835 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       693
Y_GRB_POS:       995
BINNING_INDEX:   1
IM_URL:          sw00296504000msuni0198.fits
SUN_POSTN:       227.55d {+15h 10m 12s}  -17.74d {-17d 44' 20"}
SUN_DIST:        166.90 [deg]   Sun_angle= -11.4 [hr] (East of Sun)
MOON_POSTN:      259.83d {+17h 19m 18s}  -27.90d {-27d 54' 14"}
MOON_DIST:       144.47 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      149.44,-28.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       45.74, 12.43 [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 12 Nov 07 18:44:58 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     296504,   Seg_Num: 0
POINT_RA:         39.213d {+02h 36m 51s} (J2000)
POINT_DEC:       +28.409d {+28d 24' 32"} (J2000)
ROLL:            322.508d
IMG_START_DATE:  14416 TJD;   316 DOY;   07/11/12
IMG_START_TIME:  66975.62 SOD {18:36:15.62} UT,   198.1 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     216585377
X_OFFSET:        533 [pixels]
Y_OFFSET:        835 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       693
Y_GRB_POS:       995
BINNING_INDEX:   1
IM_URL:          sw00296504000msuni0198.fits
SUN_POSTN:       227.55d {+15h 10m 12s}  -17.74d {-17d 44' 20"}
SUN_DIST:        166.90 [deg]   Sun_angle= -11.4 [hr] (East of Sun)
MOON_POSTN:      259.83d {+17h 19m 19s}  -27.90d {-27d 54' 15"}
MOON_DIST:       144.47 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      149.44,-28.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       45.74, 12.43 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_sources_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Nov 07 18:49:28 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     296504,   Seg_Num: 0
POINT_RA:         39.212d {+02h 36m 51s} (J2000)
POINT_DEC:       +28.409d {+28d 24' 32"} (J2000)
POINT_ROLL:      322.508d
IMG_START_DATE:  14416 TJD;   316 DOY;   07/11/12
IMG_START_TIME:  67636.10 SOD {18:47:16.10} UT,   858.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.969
N_STARS:         35
X_OFFSET:        213 [pixels]
Y_OFFSET:        515 [pixels]
X_MAX:           1172 [pixels]
Y_MAX:           1474 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00296504000msufc0858.fits
SUN_POSTN:       227.55d {+15h 10m 13s}  -17.74d {-17d 44' 23"}
SUN_DIST:        166.90 [deg]   Sun_angle= -11.4 [hr] (East of Sun)
MOON_POSTN:      259.87d {+17h 19m 29s}  -27.91d {-27d 54' 21"}
MOON_DIST:       144.43 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      149.44,-28.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       45.74, 12.43 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Nov 07 18:49:51 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     296504,   Seg_Num: 0
POINT_RA:         39.212d {+02h 36m 51s} (J2000)
POINT_DEC:       +28.409d {+28d 24' 32"} (J2000)
POINT_ROLL:      322.508d
IMG_START_DATE:  14416 TJD;   316 DOY;   07/11/12
IMG_START_TIME:  67636.10 SOD {18:47:16.10} UT,   858.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.969
N_STARS:         35
X_OFFSET:        213 [pixels]
Y_OFFSET:        515 [pixels]
X_MAX:           1172 [pixels]
Y_MAX:           1474 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00296504000msufc0858.fits
SUN_POSTN:       227.55d {+15h 10m 13s}  -17.74d {-17d 44' 24"}
SUN_DIST:        166.90 [deg]   Sun_angle= -11.4 [hr] (East of Sun)
MOON_POSTN:      259.88d {+17h 19m 30s}  -27.91d {-27d 54' 22"}
MOON_DIST:       144.43 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      149.44,-28.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       45.74, 12.43 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #7059
M. Perri (ASDC), G. Stratta (ASDC), S. D. Barthelmy (GSFC), P. J. Brown (PSU), J. R. Cummings (NASA/UMBC), G. Cusumano (INAF-IASFPA), N. Gehrels (NASA/GSFC), C. Gronwall (PSU), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), C. B. Markwardt (CRESST/GSFC/UMD), P. T. O'Brien (U Leicester), J. P. Osborne (U Leicester), C. Pagani (PSU), D. M. Palmer (LANL), A. M. Parsons (GSFC), J. L. Racusin (PSU), P. Romano (Univ. Bicocca & INAF-OAB), R. L. C. Starling (U Leicester), T. N. Ukwatta (GSFC/GWU) and D. E. Vanden Berk (PSU) report on behalf of the Swift Team:
At 18:32:57 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 071112C (trigger=296504). Swift slewed immediately to this burst. The BAT on-board calculated location is RA, Dec 39.220, +28.381 which is
```
   RA(J2000)  =  02h 36m 53s
   Dec(J2000) = +28d 22' 50"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). We do not know anything about the lightcurve from this "C" burst, because it came so closely after the previous ("B") burst that the on-board script was still running.
The XRT began observing the field at 18:34:21 UT, 84 seconds after the BAT trigger. XRT found a fading uncatalogued X-ray source located at RA, Dec 39.2122, +28.3708 which is
```
   RA(J2000)  =  02h 36m 50.9s
   Dec(J2000) = +28d 22' 14.9"
```
with an uncertainty of 4.1 arcseconds (radius, 90% containment). This location is 44 arcseconds from the BAT on-board position, within the BAT error circle. The initial flux in the 2.5s image was 1.3e-09 erg/cm2/s (0.2-10 keV).
UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 92 seconds after the BAT trigger. There is a fading candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	02:36:50.93 =  39.2122
  DEC(J2000) = +28:22:16.7  =  28.3713
```
with a 1-sigma error radius of about 0.5 arc sec. This position is 1.8 arc sec. from the center of the XRT error circle. The estimated magnitude is 17.3 with a 1-sigma error of about 0.5 mag. No correction has been made for extinction.
Burst Advocate for this burst is G. Stratta (giulia.stratta AT asdc.asi.it). 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 12 Nov 07 18:50:53 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     296504,   Seg_Num: 0
POINT_RA:         39.212d {+02h 36m 51s} (J2000)
POINT_DEC:       +28.409d {+28d 24' 32"} (J2000)
ROLL:            322.508d
IMG_START_DATE:  14416 TJD;   316 DOY;   07/11/12
IMG_START_TIME:  67636.10 SOD {18:47:16.10} UT,   858.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     216586038
X_OFFSET:        532 [pixels]
Y_OFFSET:        834 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       692
Y_GRB_POS:       994
BINNING_INDEX:   1
IM_URL:          sw00296504000msuni0858.fits
SUN_POSTN:       227.56d {+15h 10m 13s}  -17.74d {-17d 44' 24"}
SUN_DIST:        166.90 [deg]   Sun_angle= -11.4 [hr] (East of Sun)
MOON_POSTN:      259.89d {+17h 19m 32s}  -27.91d {-27d 54' 23"}
MOON_DIST:       144.42 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      149.44,-28.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       45.74, 12.43 [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 12 Nov 07 18:51:20 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     296504,   Seg_Num: 0
POINT_RA:         39.212d {+02h 36m 51s} (J2000)
POINT_DEC:       +28.409d {+28d 24' 32"} (J2000)
ROLL:            322.508d
IMG_START_DATE:  14416 TJD;   316 DOY;   07/11/12
IMG_START_TIME:  67636.10 SOD {18:47:16.10} UT,   858.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     216586038
X_OFFSET:        532 [pixels]
Y_OFFSET:        834 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       692
Y_GRB_POS:       994
BINNING_INDEX:   1
IM_URL:          sw00296504000msuni0858.fits
SUN_POSTN:       227.56d {+15h 10m 13s}  -17.74d {-17d 44' 25"}
SUN_DIST:        166.90 [deg]   Sun_angle= -11.4 [hr] (East of Sun)
MOON_POSTN:      259.89d {+17h 19m 34s}  -27.91d {-27d 54' 24"}
MOON_DIST:       144.41 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      149.44,-28.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       45.74, 12.43 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_sources_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Nov 07 18:53:30 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     296504,   Seg_Num: 0
GRB_RA:           39.2126d {+02h 36m 51.0s} (J2000),
                  39.3283d {+02h 37m 18.7s} (current),
                  38.4782d {+02h 33m 54.7s} (1950)
GRB_DEC:         +28.3704d {+28d 22' 13.4"} (J2000),
                 +28.4043d {+28d 24' 15.4"} (current),
                 +28.1536d {+28d 09' 12.8"} (1950)
GRB_ERROR:       4.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  14416 TJD;   316 DOY;   07/11/12
IMG_START_TIME:  67150.00 SOD {18:39:10.00} UT,   372.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       227.56d {+15h 10m 14s}  -17.74d {-17d 44' 26"}
SUN_DIST:        166.93 [deg]   Sun_angle= -11.5 [hr] (East of Sun)
MOON_POSTN:      259.91d {+17h 19m 38s}  -27.91d {-27d 54' 26"}
MOON_DIST:       144.39 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      149.46,-29.02 [deg] galactic lon,lat of the burst
ECL_COORDS:       45.73, 12.40 [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.php for details.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Nov 07 18:56:03 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     296504,   Seg_Num: 0
POINT_RA:         39.213d {+02h 36m 51s} (J2000)
POINT_DEC:       +28.409d {+28d 24' 32"} (J2000)
POINT_ROLL:      322.508d
IMG_START_DATE:  14416 TJD;   316 DOY;   07/11/12
IMG_START_TIME:  67742.04 SOD {18:49:02.04} UT,   964.5 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.822
N_STARS:         47
X_OFFSET:        213 [pixels]
Y_OFFSET:        515 [pixels]
X_MAX:           1172 [pixels]
Y_MAX:           1474 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00296504000msufc0964.fits
SUN_POSTN:       227.56d {+15h 10m 14s}  -17.74d {-17d 44' 28"}
SUN_DIST:        166.90 [deg]   Sun_angle= -11.4 [hr] (East of Sun)
MOON_POSTN:      259.93d {+17h 19m 44s}  -27.91d {-27d 54' 30"}
MOON_DIST:       144.38 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      149.44,-28.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       45.74, 12.43 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Nov 07 18:56:30 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     296504,   Seg_Num: 0
POINT_RA:         39.213d {+02h 36m 51s} (J2000)
POINT_DEC:       +28.409d {+28d 24' 32"} (J2000)
POINT_ROLL:      322.508d
IMG_START_DATE:  14416 TJD;   316 DOY;   07/11/12
IMG_START_TIME:  67742.04 SOD {18:49:02.04} UT,   964.5 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        1.822
N_STARS:         47
X_OFFSET:        213 [pixels]
Y_OFFSET:        515 [pixels]
X_MAX:           1172 [pixels]
Y_MAX:           1474 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00296504000msufc0964.fits
SUN_POSTN:       227.56d {+15h 10m 14s}  -17.74d {-17d 44' 28"}
SUN_DIST:        166.90 [deg]   Sun_angle= -11.4 [hr] (East of Sun)
MOON_POSTN:      259.94d {+17h 19m 45s}  -27.91d {-27d 54' 31"}
MOON_DIST:       144.37 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      149.44,-28.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       45.74, 12.43 [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 12 Nov 07 18:57:21 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     296504,   Seg_Num: 0
POINT_RA:         39.213d {+02h 36m 51s} (J2000)
POINT_DEC:       +28.409d {+28d 24' 32"} (J2000)
ROLL:            322.508d
IMG_START_DATE:  14416 TJD;   316 DOY;   07/11/12
IMG_START_TIME:  67742.04 SOD {18:49:02.04} UT,   964.5 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     216586144
X_OFFSET:        532 [pixels]
Y_OFFSET:        834 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       692
Y_GRB_POS:       994
BINNING_INDEX:   1
IM_URL:          sw00296504000msuni0964.fits
SUN_POSTN:       227.56d {+15h 10m 14s}  -17.74d {-17d 44' 29"}
SUN_DIST:        166.90 [deg]   Sun_angle= -11.4 [hr] (East of Sun)
MOON_POSTN:      259.95d {+17h 19m 47s}  -27.91d {-27d 54' 32"}
MOON_DIST:       144.37 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      149.44,-28.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       45.74, 12.43 [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 12 Nov 07 18:57:48 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     296504,   Seg_Num: 0
POINT_RA:         39.213d {+02h 36m 51s} (J2000)
POINT_DEC:       +28.409d {+28d 24' 32"} (J2000)
ROLL:            322.508d
IMG_START_DATE:  14416 TJD;   316 DOY;   07/11/12
IMG_START_TIME:  67742.04 SOD {18:49:02.04} UT,   964.5 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     216586144
X_OFFSET:        532 [pixels]
Y_OFFSET:        834 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       692
Y_GRB_POS:       994
BINNING_INDEX:   1
IM_URL:          sw00296504000msuni0964.fits
SUN_POSTN:       227.56d {+15h 10m 15s}  -17.74d {-17d 44' 29"}
SUN_DIST:        166.90 [deg]   Sun_angle= -11.4 [hr] (East of Sun)
MOON_POSTN:      259.95d {+17h 19m 48s}  -27.91d {-27d 54' 32"}
MOON_DIST:       144.36 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      149.44,-28.98 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       45.74, 12.43 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_sources_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 12 Nov 07 19:00:09 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     296504,   Seg_Num: 0
GRB_RA:           39.2122d {+02h 36m 50.92s} (J2000),
                  39.3279d {+02h 37m 18.70s} (current),
                  38.4778d {+02h 33m 54.67s} (1950)
GRB_DEC:         +28.3713d {+28d 22' 16.6"} (J2000),
                 +28.4052d {+28d 24' 18.6"} (current),
                 +28.1545d {+28d 09' 16.0"} (1950)
GRB_ERROR:       0.4 [arcsec radius, statistical only]
GRB_MAG:         17.29 +/- 0.50 [mag]
FILTER:          10, White
IMG_START_DATE:  14416 TJD;   316 DOY;   07/11/12
IMG_START_TIME:  66870.00 SOD {18:34:30.00} UT,   92.5 [sec] since BAT Trigger Time
SUN_POSTN:       227.56d {+15h 10m 15s}  -17.74d {-17d 44' 31"}
SUN_DIST:        166.93 [deg]   Sun_angle= -11.5 [hr] (East of Sun)
MOON_POSTN:      259.97d {+17h 19m 53s}  -27.91d {-27d 54' 35"}
MOON_DIST:       144.34 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:      149.46,-29.01 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       45.73, 12.40 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN Circular #7061
F. Yuan (U Mich), E.S. Rykoff (UCSB), W. Rujopakarn (Steward), H. Swan (U Mich), report on behalf of the ROTSE collaboration:
ROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia, responded to GRB 071112C (Swift trigger 296504; Perri, M. et. al., GCN 7059). The first image was at 18:34:01.8 UT, 64.3 s after the burst (10.8 s after the GCN notice time). We detect the OT reported in GCN 7059. The magnitude of the OT was roughly constant for the first few hundred seconds and then faded rapidly afterward. Further analysis is ongoing. The unfiltered images are calibrated relative to USNO B1.0.
```
Midtime UT       mag      magerror   mlim(of image)
--------------------------------------------------------------------
18:34:56.4   17.3       0.2     17.1
18:38:52.2   17.1       0.1     18.0
18:47:46.5   18.9       0.3     18.4
```
A jpeg image of the OT (object 82) is available at http://www.rotse.net/images/gsb296504_3c011-020_key.jpg
Continuing observations are in progress.
GCN Circular #7062
M. Uemura, M. Sasada, A. Arai, and T. Uehara (Hiroshima Univ.), report on behalf of the KANATA GRB team:
We performed optical-NIR observations of the field of GRB 071112C (GCN Circ. 7059) with TRISPEC attached to the "KANATA" 1.5-m telescope.
We found a fading object at the position of the optical afterglow detected with UVOT. Our preliminary results are below:
```
time(UT)       mag.              exposure_time
Nov. 2007                        (sec)
12.77880       17.76 +/- 0.14 V  30sec * 10
12.77911       16.39 +/- 0.22 J  25sec * 9
12.78674       18.66 +/- 0.20 V  123sec * 5
12.78672       17.16 +/- 0.17 J  120sec * 5
```
Comparison star:
```
V-band: GSC2.3 02:36:55.72 +28:21:03.7 V=14.15
J-band: 2MASS  02:36:55.72 +28:21:03.7 J=12.674
```
The large errors of magnitudes are due to the rapidly fading trend of the afterglow. Further observation and analysis are ongoing.
GCN Circular #7063
X.F.Wang, L.P. Xin, M. Zhai, Y.L. Qiu, J.Y. Wei, J.Y. Hu, J.S. Deng, J. Wang, Y. Urata and W.K. Zheng on behalf of EAFON report:
We have imaged the field of GRB071112C (M. Perri et al=20 GCN7059 ) using the TNT 0.8 telescope and EST 1.0 telescope at Xinglong=20 observatory.A series of white-band ,R-band and V-band images were obtaine= d=20 from 18:34:51, 113s after the burst. In our 20*20s white-band combined im= age, =A0 we detected afterglow =A0as reported (M. Perri et al GCN 7059, F. Yuan=20 GDN7061).
The estimated brightness derived from USNO-B1.0 R2mag was R2=3D17.62+/-0.= 06 at=20 38.8s after the burst(mean time of the stacked image).
Further observations are going.
This message may be cited.
GCN Circular #7065
Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report:
We imaged the field of GRB 071112 detected by SWIFT (trigger 296504) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France.
The observations started 65.0s after the GRB trigger (10.7s after the notice). The elevation of the field increased from from 38 degrees above horizon and weather conditions were fully cloudy until 90 minutes after the GRB. We co-added a series of exposures taken between 98 and 155 min. We detect the OT reported by Perri et al. (GCNC 7059) near the limiting magnitude:
t_grb+98 min. to t_grb+155 min. : R = 20.1 +/- 0.3
Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.
This message may be cited.
GCN Circular #7066
R. Burenin, (IKI), I. Khamitov (TUG), M. Pavlinsky, R. Sunyaev (IKI), Z. Eker (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.), I. Bikmaev, N. Sakhibullin (KSU/AST)
report:
The optical counterpart of GRB 071112C (GCN 7059) was observed with Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National Observatory, Turkey), under poor observational conditions. First image was taken 16.7 min after the burst. Assuming R=16.0 and B=16.76 magnitudes for nearby star USNO-B1.0 1183-0043866 we estimated the following magnitudes for the OT:
```
18:49:39 UT, B=18.8
18:54:08 UT, R=18.7
```
During the first hour after the burst the power law slope of the fading OT flux is -0.83 +- 0.09 in R band and is approximatly similar in BVI.
This message may be cited.
GCN Circular #7067
I.C. Chen (NCU), K.Y. Huang (ASIAA), Y. Urata (Saitama-U/ASIAA) on behalf of the EAFON team
"We have observed the GRB 071112C field (Perri et al., GCN 7059) using Lulin 1-m telescope. The R-band image with 150 sec exposure marginally detected the optical afterglow (Perri et al., GCN7059, Yuan et al GCN7061 Wang et al GCN7063) with 20.3 +/- 0.3 at 1.77 hrs after the burst. This result is consistent with extrapolation from the RTT150 observations with power-law index -0.83 reported by Burenin et al. (GCN7066)."
This message can be cited.
GCN Circular #7069
P. Nugent (LBL) and J. S. Bloom (UC Berkeley) report:
"We have created a stacked image through the co-addition of 17 unfiltered images taken by the NEAT collaboration and 42 images in the RG610 filter taken by the Palomar-Quest Consortium at the Palomar Oschin Schmidt telescope (obtained from 2001-2007), of GRB 071112C (Perri et al.; GCN 7059). The stacked image is significantly deeper than the DSS (3 sigma limit of R~24 mag).
There is no source at the position of the UVOT counterpart (Perri et al.; GCN 7059), however we do find a faint source 2.24" to the southwest inside the XRT error circle at position:
02:36:50.79 +28:22:15.3 J2000
A preliminary reduction yield a magnitude of R=24.1 +/- 0.4 for that source."
The image is available at http://www.lbl.gov/~nugent/deepsky.html
This message may be cited.
GCN Circular #7070
J. Sollerman (DARK and Stockholm), G. Leloudas (DARK), Pall Jakobsson (Hertfordshire), J. P. U. Fynbo, D. Malesani, P. Vreeswijk (DARK) report on behalf of a larger collaboration :
We obtained R-band imaging and a spectrum of the optical afterglow of GRB 071112C (Perri et al. GCN #7059) with the Nordic Optical Telescope on November UT 12.9. Unfortunately our observations were hampered by clouds so the signal-to-noise ratio of the spectrum is low. The optical afterglow is clearly detected in our images. The continuum of the optical afterglow is detected to 3800 AA so the redshift of GRB071112C is most likely less than about 2.3. No significant lines are detected.
GCN Circular #7076
Pall Jakobsson (U. Hertfordshire), Johan P. U. Fynbo, Paul M. Vreeswijk, Daniele Malesani (DARK, NBI) and Jesper Sollerman (DARK, NBI; U. Stockholm) report on behalf of a larger collaboration:
Using FORS2 on the Very Large Telescope, we have obtained 2*30 min spectra (grism 300V) of the optical afterglow of GRB 071112C (Perri et al., GCN 7059).
The spectrum displays numerous Fe II lines and the Mg II doublet (2796,2803) in absorption corresponding to a redshift of z = 0.823 (based on a preliminary wavelength calibration). At this redshift we also find emission lines corresponding to [O II] 3728 and [O III] 5008.
We thank the Paranal staff for excellent support, especially Stephane Brillant and Linda Schmidtobreick.
GCN Circular #7078
B. Dintinjana, S. Maticic, H. Mikuz and J. Skvarc on behalf of PIKA observing program at Crni Vrh Observatory:
We observed the afterglow of GRB 071112C (Perri et al., GCN 7059) with 60-cm Cichocki robotic telescope at Crni Vrh Observatory, Slovenia in rather poor seeing conditions. The series of nineteen 90 second connsecutive exposures with Rc filter started at 18:35:51UT, 118 seconds after the GCN notice time. We confirm optical afterglow found by UVOT. The object measured coordinates are RA=02:36:50.95, DEC=+28:22:16.8 (J2000). The object was clearly detected on first nine frames after which it dropped below the detection limit.
Photometry results are given in table below. The magnitudes are derived using comparison stars from the USNO-B1 catalogue. The 3-sigma limiting magnitude in R filter is around magnitude 18.2.
Time refers to exposure start.
```
Time (UT)           Exposure(s) Mag.    Err.   Filter
2007 Nov 12.77490   90          17.25   0.13   R
2007 Nov 12.77659   90          17.49   0.15   R
2007 Nov 12.77826   90          17.84   0.18   R
2007 Nov 12.77994   90          17.82   0.21   R
2007 Nov 12.78162   90          18.53   0.29   R
2007 Nov 12.78330   90          18.81   0.63   R
2007 Nov 12.78498   90          18.51   0.31   R
2007 Nov 12.78665   90          18.68   0.49   R
2007 Nov 12.78834   90          18.88   0.62   R
```
GCN Circular #7079
G. Stratta (ASDC) , M. Perri (ASDC) and D. N. Burrows (PSU) report on behalf of the Swift Team:
We have analysed the first 7 orbits of Swift-XRT data obtained for GRB 071112C (Perri et al. GCN Circ.7059), totaling 281 s of Windowed Timing (WT) data and 29.1 ks of Photon Counting (PC) data.
Using 625 s of overlapping XRT Photon Counting mode and UVOT V-band data, 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 =39.21220, 28.37102 which is equivalent to:
```
RA (J2000):  02 36 50.93
Dec (J2000): +28 22 15.7
```
with an uncertainty of 1.7 arcsec (radius, 90% confidence). This is 1.0 arcsec from the previous XRT position, 0.7 arcmin from the BAT position and 1.0 arcsec from the UVOT position (Perri et al, GCN Circ. 7059).
The bright X-ray light-curve can be fit by a simple power-law, with a decay index of 1.35 +/- 0.1. Between about 400s and 1100s from the trigger, the data deviate from the model, possibly pointing out a smooth re-brightening.
The WT data (91-372 seconds from trigger) can be modeled as an absorbed power-law, with photon index of 1.7 +/- 0.1 and a total absorbing column density consistent with the Galactic value of NH=7.4e20 cm^-2 (Dickey & Lockmann 1990). The 0.3-10 keV observed (unabsorbed) flux during this time is 4.4e-10(4.9e-10) erg cm^-2 s^-1.
Assuming the source continues to decay with the same decay index of 1.35,we predict an XRT count rate of 3.0e-3 counts/s at T+24 hours, which corresponds to an 0.3-10.0 keV observed flux of 1.2e-13 ergs cm^-2 s^-1.
This circular is an official product of the Swift-XRT team.

GCN Circular #7080
S.R. Oates (MSSL/UCL) and G. Stratta (ASDC) report on behalf of the Swift-UVOT team:
The Swift/UVOT observed the burst GRB 071121C (Perri et al., GCN Circ. 7059) starting with the finding chart exposure in white, 92 seconds after the BAT trigger. The afterglow is detected at the UVOT position given in Perri et al. (GCN Circ. 7059) in white, v, b, u and uvw1. The afterglow decreases with an estimated temporal slope in the v filter of alpha =1.28.
The UVOT magnitudes and upper limits from single exposures or co-added exposures are given below:

Filter  Tstart(s)  Tstop(s)  Exp(s)  Mag
----------------------------------------------
white     92      192         98    17.39 +/- 0.03
          859     958         98    19.0  +/- 0.1
v         198     597         393   17.9  +/- 0.4
          965     1364        393   19.3  +/- 0.3
b         679     689         10    18.3  +/- 0.4
          1444    1626        39    19.7  +/- 0.5  (2.0-sigma)
u         654     674         19    17.8  +/- 0.3
          1419    1601        39    19.3  +/- 0.5  (2.0-sigma)
uvw1      630     649         19    17.7  +/- 0.3
          1394    1576        39    19.0  +/- 0.5  (2.3-sigma)
uvm2      605     1552        78    >20.5
uvw2      708     1663        55    >20.6
----------------------------------------------

The values quoted above are not corrected for the expected Galactic extinction corresponding to a reddening of E_{B-V} = 0.119 mag in the direction of the burst (Schlegel et al. 1998).

GCN Circular #7081
H. Krimm (GSFC/USRA), L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho), M. Koss (GSFC/UMD), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), G. Stratta (ASDC), J. Tueller (GSFC), on behalf of the Swift-BAT team:
Using a partial data set from T-122 to T+10 sec from the recent telemetry downlink, we report further analysis of BAT GRB 071112C (trigger #296504) (Stratta, et al., GCN Circ. 7059). Because of the unusually short time between detection of GRB 071112B (Perri, et al., GCN Circ. 7058) and this burst, we have only a partial data set. This analysis is based on BAT survey data rather than "event" data. No event data were created for this burst. In particular, the fluence quoted below does not include the tail of the peak, though it appears to include about 80% of the total fluence. The T90 period and our estimate of the 1-second peak photon flux are a little more uncertain than usual as well, and the quoted errors have been increased to reflect this.
The BAT ground-calculated position is (RA,Dec) = 39.218 +28.368 {02h 36m 52.3s,+28d 22' 04"} [deg; J2000] +- 1.0 arcmin, (radius, sys+stat, 90% containment). The burst was in the fully-coded field of view.
The burst consisted of a single FRED peak. T90 (15-350 keV) is (15 +- 2) sec (estimated error including systematics).
The power law index of the time-averaged spectrum is 1.09 +- 0.07. The fluence for the period T-122 to T+10 seconds (including about 80% of the total fluence) in the 15-150 keV band is (3.0 +- 0.4) x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0 sec in the 15-150 keV band is 8 +- 1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
GCN Circular #7082
M. Yoshida, K. Yanagisawa, Y. Shimizu, S. Nagayama, H. Toda (OAO, NAOJ) and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We performed optical imaging observations (G, Rc and Ic) of the field of GRB 071112C (Perri et al., GCN 7059) with 50cm MITSuME telescope at Okayama Astrophysical Observatory from UT 18:35 to UT 19:52 on November 12 2007.
We found a fading source at the position of the optical afterglow reported by several authors (Yuan et al., GCN 7061; Wang et al., GCN 7063; Burenin et al., GCN 7066; Chen et al., GCN 7067; Sollerman et al., GCN 7070) in all bands. We made flux calibration using USNO B1.0 catalog. The photometric results are following.
```
start-T   end-T     mid-T     exp-T  G          Rc         Ic
---------------------------------------------------------------------
18:35:34  18:36:34  18:36:04   1min  17.1+-0.1  17.0+-0.1  17.9+-0.1
18:35:34  18:39:00  18:37:17   3min  17.2+-0.1  17.2+-0.1  18.0+-0.1
18:39:12  18:45:09  18:42:10   5min  17.9+-0.1  18.0+-0.1  18.6+-0.1
18:45:19  18:56:20  18:50:49   7min  18.8+-0.2  18.5+-0.2  19.6+-0.2
18:56:30  19:08:46  18:32:38  10min  19.3+-0.4  19.0+-0.2  >19.8
19:08:56  19:57:01  19:32:58  40min  >19.5      19.6+-0.2  >20.0
---------------------------------------------------------------------
```
GCN Report 104.1
GCN_Report 104.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_104_1.pdf by G. Stratta at ASDC titled: "Swift Observations of GRB 071112C"
GCN Circular #7083
I.C. Chen (NCU), K.Y. Huang (ASIAA), Y. Urata (Saitama-U/ASIAA) on behalf of the EAFON team :
"A series of R-band images for GRB 071112C field (Perri et al., GCN 7059) were taken with 300 sec exposure using Lulin 1-m telescope. The afterglow was detected clearly in our R-band combined image. Comparison with nearby USNOB stars, the brightness of afterglow is 22.7 +/- 0.2 at 0.806 days after the burst. This measurement is consistent with the extrapolation from the RTT150 observations (Burenin et al., GCN 7066) and implies no temporal break during our two epochs of R-band observations (Chen et al.; GCN7067)."
This message can be cited.
GCN Circular #7084
Adria C. Updike, Dieter H. Hartmann (Clemson University) and Kenneth S. Rumstay (Valdosta University) report on behalf of the Clemson GRB Follow-Up Team:
We imaged the field of GRB 071112C (GCN 7059, Perri et al.) with the 0.9m SARA telescope on Kitt Peak under decent weather conditions. We obtained 75 min of stacked exposures beginning 8 hours and 47 min after the trigger. We do not detect the afterglow (GCN 7059, Perri et al.) down to a limiting magnitude of R ~ 21 in the stacked images (based on calibration of 10 field stars to the USNO B1.0 catalog).
The SARA observatory website may be found at http://astro.fit.edu/sara/sara.html
This message may be cited.
GCN Circular #7086
A. Cucchiara and D. B. Fox (Penn State), with E. Berger (Princeton and Carnegie Observatories), report on behalf of a larger collaboration:
"Starting on 2007 November 13.33 UT we observed GRB 071112C (Perri et al., GCN 7059) with the GMOS spectrograph on the Gemini North telescope. We obtained 4x900 sec spectra in the wavelength range 3900-6800A. We clearly observe several metal absorption features corresponding to MgII, MgI, FeII, and MnII at a redshift z = 0.823, confirming the preliminary redshift reported from VLT observations by Jacobsson et al.(GCN 7076)."
GCN Circular #7087
T. Ishimura, T. Shimokawabe, Y. Mori, Y. Kudou, N. Vasquez, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 071112C (Perri et al., GCN 7059) with the 3-color 50cm MITSuME Telescope at Akeno, Japan starting at 18:34:39 UT, 102s after the trigger.
In the images of g' and Rc bands, we detected the optical counterpart reported by several authors (GCNs 7059, 7061, 7062 etc.). Photometric calibration was done using the USNO-B1.0 (Ic-band) and NOMAD (g'-bands) catalogs. The results are following:
```
start time  end time     Exposure    g' [mag]       Rc[mag]
---------------------------------------------------------------
18:34:39   18:35:39      1 x 60s     17.6 +/- 0.5  17.3 +/- 0.3
---------------------------------------------------------------
```
GCN Circular #7088
Pall Jakobsson (U. Hertfordshire), Johan P. U. Fynbo, Daniele Malesani, Paul M. Vreeswijk, Jens Hjorth, Dong Xu (DARK, NBI) and Jesper Sollerman (DARK, NBI; U. Stockholm) report on behalf of a larger collaboration:
We have flux calibrated the VLT spectrum of the GRB 071112C optical afterglow (Jakobsson et al., GCN 7076). We clearly detect four emission lines: [O II] 3727, [Ne III] 3869 and [O III] 4960,5008. Using the relations by Kennicutt (1998, ARA&A, 36, 189), the flux of the [O II] line corresponds to a star formation rate (SFR) of approximately 0.5 M_Sun/year. This value has not been corrected for host extinction or slit loss, and is therefore a strict lower limit to the actual SFR.
The flux ratio of [Ne III] and [O II] is typical of GRB host galaxies, with log([Ne III]/[O II]) ~ -0.5 (see Fig 4 in Wiersema et al., arXiv:0706.1345v1). The presence of such strong emission lines in the OA spectrum indicates a fairly bright host, approximately 24 < R < 25 (see also Nugent & Bloom, GCN 7069).
Finally, using new wavelength calibration files we report a more accurate absorption redshift (based on 8 lines): z = 0.8230 +/- 0.0003.
GCN Circular #7089
G. Greco (Bologna University), F. Terra (Second University of Roma "Tor Vergata"), C. Bartolini, A. Guarnieri, A. Piccioni (Bologna University), G. Pizzichini (INAF/IASF Bologna), D. Nanni (INAF/OAR and Second University of Rome "Tor Vergata"), R. Gualandi (Bologna Observatory) report:
We observed the afterglow of GRB 071112C (Perri et al., GCN 7059) with the 152 cm Cassini Telescope located in Loiano under clear sky conditions (seeing approximately 1.8 arcsec). We obtained three 20 min Rc-band images starting on 2007 November 12.929 UT (mean time).
In our co-added images we estimated the following magnitude by comparison with the NOMAD1 catalog: Rc= 21 +/- 0.2 This result is consistent with a power-law index = -0.8 as reported by Burenin et al. (GCN7066) and Chen et al. (GCN 7083).
The co-added Rc image, in which the comparison stars are marked, has been posted in our public directory from where it can be retrieved by sftp using
```
hostname: ermione.bo.astro.it
username: publicGRB
password: GRB_bo.
directory: GRB071112C
```
GCN Circular #7090
Stefano Sposetti (Gnosca, Switzerland) reports to the AAVSO International High Energy Network the following optical observations of GRB071112C (GCN #7059, Perri et al.):
Stefano Sposetti reports the detection of the optical afterglow of GRB071112C (Perri et al., GCN 7059, and several subsequent reports). The afterglow was observed unfiltered for 2700 seconds, using a 0.4-meter Newtonian with an SBIG ST8XE CCD and no filter. Observations commenced approximately 4 hours and 10 minutes post BAT detection; the midpoint of the observational sequence was 2007 November 12.9625 UT. The afterglow was detected at an unfiltered magnitude of 21.0 +/- 0.5, calibrated relative to USNO-A2.0. This magnitude is consistent with the reported detection by Greco et al. (GCN #7089) on November 12.929 UT at Rc = 21 +/- 0.2.
A detailed report on these observations is available on the AAVSO website at ftp://ftp.aavso.org/grb/StefanoSposetti_GRB071112C_2454419.20588_.txt
A fits image is available at ftp://ftp.aavso.org/grb/StefanoSposetti_GRB071112C_2454419.20588_.fits
The AAVSO thanks the Curry Foundation for their continued support of the AAVSO International High Energy Network.

GCN Circular #7091
M. Yoshida, K. Yanagisawa, Y. Shimizu, S. Nagayama, H. Toda (OAO, NAOJ) and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
The Ic band photometry results reported in GCN 7082 are not correct. The correct values are 1.5 magnitude brighter than those in GCN 7082. We made a mistake in calculating the zero point magnitudes of our Ic band frames. We also checked the results of other two bands (g' and Rc) photometry carefully and found they are correct.
Please discard the results of GCN 7082. The reviced data are following.
Observation date: 2007-11-12 UT

start-UT  end-UT    mid-UT     exp-T  g'         Rc         Ic
---------------------------------------------------------------------
18:35:34  18:36:34  18:36:04   1min  17.1+-0.1  17.0+-0.1  16.4+-0.1
18:35:34  18:39:00  18:37:17   3min  17.2+-0.1  17.2+-0.1  16.5+-0.1
18:39:12  18:45:09  18:42:10   5min  17.9+-0.1  18.0+-0.1  17.1+-0.1
18:45:19  18:56:20  18:50:49   7min  18.8+-0.2  18.5+-0.2  18.1+-0.2
18:56:30  19:08:46  18:32:38  10min  19.3+-0.4  19.0+-0.2  >18.3
19:08:56  19:57:01  19:32:58  40min  >19.5      19.6+-0.2  >18.5
---------------------------------------------------------------------

GCN Circular #7092
A.J. van der Horst (NASA/MSFC) and R.A.M.J. Wijers (University of Amsterdam) report on behalf of a larger collaboration:
"We observed the position of the GRB 071112C afterglow at 4.9 GHz with the Westerbork Synthesis Radio Telescope at November 14 16.61 UT to November 15 4.60 UT, i.e. 1.92 - 2.42 days after the burst (GCN 7059). We do not detect a radio source at the position of the optical counterpart (GCN 7059). The three-sigma rms noise in the map around that position is 93 microJy per beam. The formal flux measurement for a point source at the position of the optical counterpart is 44 +/- 31 microJy.
We would like to thank the WSRT staff for scheduling and obtaining these observations."

GCN Circular #7094
M. Uemura, M. Sasada, A. Arai, and T. Uehara (Hiroshima Univ.), report on behalf of the KANATA GRB team:
We finished a full reduction of our optical-NIR images of the field of GRB061112C taken with TRISPEC/KANATA. A part of preliminary results was reported in GCN Circ. 7062. Obtained magnitudes are below:

# Time after burst V-mag  err.
#     (sec)
# mid start   end 
  324   309   339  17.69  0.14
  377   362   392  17.89  0.19
  430   415   445  17.93  0.20
  483   468   498  18.02  0.22
  538   523   553  18.15  0.27
  590   575   605  18.64  0.53
  643   628   658  18.41  0.39
  699   684   714  18.30  0.33
  752   737   767  18.37  0.36
  970   835  1105  18.72  0.36
 1271  1136  1406  19.53  0.11
 1571  1436  1706  19.59  0.39
 1873  1738  2008  19.62  0.53
 2173  2038  2308  19.61  0.13
 3079  2340  3818  20.66  0.53
 4583  3844  5322  19.80  0.34
#
# Time after burst J-mag  err.
#     (sec)
# mid start   end 
  367   309   425  15.93  0.27
  527   469   585  16.37  0.52
  688   630   746  16.67  0.28
  969   835  1103  17.07  0.42
 1269  1136  1402  17.34  0.46
 1570  1436  1704  17.19  0.18
 1871  1738  2004  17.47  0.41
 2172  2038  2306  17.50  0.45
 3078  2340  3816  17.97  0.35
 4581  3844  5318 >17.67
#
# Time after burst Ks-mag err.
#     (sec)
# mid start   end 
  541   309   773  15.00  0.37
 1201   835  1567  15.91  0.50
 1959  1593  2325  16.58  0.45
 2728  2353  3103  16.70  1.01
 4222  3130  5314 >16.77

Comparison star:

V-band: GSC2.3 02:36:41.48 +28:20:53.5 V=14.43
J-band: 2MASS  02:36:41.46 +28:20:53.4 J=13.238
K-band: 2MASS  02:36:41.46 +28:20:53.4 K=12.792

Using our data, we calculated decay indices, alpha :

    alpha_V  = 0.96 +/- 0.09
    alpha_J  = 0.82 +/- 0.06
    alpha_Ks = 1.01 +/- 0.09

No prominent color change was seen during our observations.
After correcting the interstellar extinction in our galaxy (Schlegel, et al. 1998), we calculated the spectral energy index, beta = 0.65 +/- 0.03 between V and Ks-band region. This beta is in agreement with the beta in X-rays (GAMMA_X=1.7, beta_X=0.7, in Stratta et al. GCN Report 104.1), while the optical emission is possibly affected by the reddening effect in the host galaxy of the GRB.
As reported in Stratta et al. GCN Report 104.1, there is an X-ray flare around 600-700 sec after the burst, whose amplitude is about factor 4 on the decay trend. We found that no correlated flux variation was found in our V-, J-, and Ks-band data. The upper limit of the amplitude is 0.4 mag in V-band.

GCN Circular #7096
P. Chandra (UVA/NRAO) and D. A. Frail (NRAO) report on behalf of the Caltech-NRAO-Carnegie GRB Collaboration:
"We observed optically bright burst GRB 071112C (GCN 7059) using the VLA at a frequency of 8.46 GHz. The observations were taken at 08.01 UT on 2007, November 16th. We do not detect any radio emission at the Swift-UVOT afterglow position (GCN 7059). The flux density limit at the afterglow position is -19 +/- 38 uJy.
The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc."
GCN Report 104.2
GCN_Report 104.2 has been posted: http://gcn.gsfc.nasa.gov/reports/report_104_2.pdf by G. Stratta at ASDC titled: "Final Swift Observations of GRB 071112C"
GCN Circular #7135
T. Minezaki (IoA, Tokyo), P.A. Price (IfA, Hawaii), Y. Yoshii (IoA, Tokyo) and L.L. Cowie (IfA, Hawaii) report:
We observed the optical afterglow of GRB 071112C (GCN #7059) with the MAGNUM telescope + MIPS dual-beam imager in RIJHK bands, commencing at 2007-11-13T05:26Z. We detect the afterglow in coadded images for each of these bands, though only marginally in H and K. The following afterglow magnitudes were calibrated using the USNO-B1.0 and 2MASS catalogues:
```
 Filter    midtime(UTC)   integ.time(min) magnitude
   R      2007-11-13 6.5h      39         22.18 +- 0.11
   I      2007-11-13 6.8h      39         22.06 +- 0.18
   J      2007-11-13 6.2h      19         21.1  +- 0.3
   H      2007-11-13 7.1h      18         21.2  +- 0.8  * marginally
   K      2007-11-13 6.8h      18         19.1  +- 0.3  * marginally
```
This message may be cited.
GCN Circular #7334
K. Y. Huang, M. E. Schwamb, J. H. Wang, C. Y. Wen, and TAOS team
The TAOS (Taiwan American Occultation Survey) telescopes responded to GRB 071112C (Perri et al.,7059) and started to take images at 93s after the burst (38s after the GCN notice time). The magnitude of afterglow, compared with a nearby USNOB star, showed R~ 16.7 at 95.5s after the burst. It is interesting to note that brightness of this afterglow displayed a shallow decrease in our first few hundred seconds. This behavior was also mentioned by Yuan et al. (GCN 7061) in the ROTSE-IIIc observations. The further data analysis is ongoing.
This message may be cited.
1006.0785 from 7 Jun 10
T. Uehara et al.: Infrared/optical - X-ray simultaneous observations of X-ray flares in GRB 071112C and GRB 080506
T. Yamashita, M. Ohno, G. Sato, S. Sato, M. Kino We investigate the origin of short X-ray flares which are occasionally observed in early stages of afterglows of gamma-ray bursts (GRBs). We observed two events, GRB 071112C and GRB 080506, before the start of X-ray flares in the optical and near-infrared (NIR) bands with the 1.5-m Kanata telescope. In conjunction with published X-ray and optical data, we analyzed densely sampled light curves of the early afterglows and spectral energy distributions (SEDs) in the NIR-X-ray ranges. We found that the SEDs had a break between the optical and X-ray bands in the normal decay phases of both GRBs regardless of the model for the correction of the interstellar extinction in host galaxies of GRBs. In the X-ray flares, X-ray flux increased by 3 and 15 times in the case of GRB 071112C and 080506, respectively, and the X-ray spectra became harder than those in the normal decay phases. No significant variation in the optical-NIR range was detected together with the X-ray flares. These results suggest that the X-ray flares were associated with either late internal shocks or external shocks from two-component jets.
1202.1356 from 8 Feb 12
K. Y. Huang et al.: The GRB 071112C: A Case Study of Different Mechanisms in X-ray and Optical Temporal Evolution
We present the study on GRB 071112C X-ray and optical light curves. In these two wavelength ranges, we have found different temporal properties. The R-band light curve showed an initial rise followed by a single power-law decay, while the X-ray light curve was described by a single power-law decay plus a flare-like feature. Our analysis shows that the observed temporal evolution cannot be described by the external shock model in which the X-ray and optical emission are produced by the same emission mechanism. No significant color changes in multi-band light curves and a reasonable value of the initial Lorentz factor ({\Gamma}0 = 275 \pm 20) in a uniform ISM support the afterglow onset scenario as the correct interpretation for the early R-band rise. The result suggests the optical flux is dominated by afterglow. Our further investigations show that the X-ray flux could be created by an additional feature related to energy injection and X-ray afterglow. Different theoretical interpretations indicate the additional feature in X-ray can be explained by either late internal dissipation or local inverse-Compton scattering in the external shock.

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Jochen Greiner, last update: 08-Feb-2012 [Disclaimer]