Gamma-ray Burst 120119A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 19 Jan 12 04:04:48 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     512035,   Seg_Num: 0
GRB_RA:          120.027d {+08h 00m 07s} (J2000),
                 120.172d {+08h 00m 41s} (current),
                 119.425d {+07h 57m 42s} (1950)
GRB_DEC:          -9.074d {-09d 04' 25"} (J2000),
                  -9.108d {-09d 06' 26"} (current),
                  -8.936d {-08d 56' 08"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       6196 [cnts]    Image_Peak=560 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       26394 [cnts]
BKG_TIME:        14656.20 SOD {04:04:16.20} UT
BKG_DUR:         8 [sec]
GRB_DATE:        15945 TJD;    19 DOY;   12/01/19
GRB_TIME:        14670.21 SOD {04:04:30.21} UT
GRB_PHI:         -12.46 [deg]
GRB_THETA:         5.12 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     45.46 [sigma]
IMAGE_SIGNIF:    15.49 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +4  +0  +0 +86  +0 
SUN_POSTN:       300.58d {+20h 02m 20s}  -20.47d {-20d 27' 55"}
SUN_DIST:        150.42 [deg]   Sun_angle= -12.0 [hr] (East of Sun)
MOON_POSTN:      243.05d {+16h 12m 11s}  -21.81d {-21d 48' 36"}
MOON_DIST:       116.03 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      229.08, 10.81 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      124.40,-29.00 [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 = 255.09,-20.07 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(5.0<100sec) coincident with the FERMI_GBM event (trignum=348638667).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 19 Jan 12 04:05:15 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      72
TRIGGER_NUM:     348638667
GRB_RA:          113.467d {+07h 33m 52s} (J2000),
                 113.616d {+07h 34m 28s} (current),
                 112.847d {+07h 31m 23s} (1950)
GRB_DEC:          -4.767d {-04d 45' 59"} (J2000),
                  -4.793d {-04d 47' 35"} (current),
                  -4.657d {-04d 39' 25"} (1950)
GRB_ERROR:       4.53 [deg radius, statistical plus systematic]
GRB_INTEN:       784 [cnts/sec]
DATA_SIGNIF:     68.70 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        15945 TJD;    19 DOY;   12/01/19
GRB_TIME:        14665.06 SOD {04:04:25.06} UT
GRB_PHI:         167.00 [deg]
GRB_THETA:        70.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.82
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      98%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 0,0,0, 0,1,1, 0,0,
SUN_POSTN:       300.58d {+20h 02m 20s}  -20.47d {-20d 27' 55"}
SUN_DIST:        153.83 [deg]   Sun_angle= -11.5 [hr] (East of Sun)
MOON_POSTN:      243.05d {+16h 12m 12s}  -21.81d {-21d 48' 37"}
MOON_DIST:       123.82 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      222.07,  7.20 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      116.22,-26.09 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 311.72,18.85 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(5.0<100sec) coincident with the SWIFT_BAT event (trignum=512035).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 19 Jan 12 04:04:54 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     348638667
GRB_RA:          203.683d {+13h 34m 44s} (J2000),
                 204.054d {+13h 36m 13s} (current),
                 202.196d {+13h 28m 47s} (1950)
GRB_DEC:         -82.833d {-82d 49' 59"} (J2000),
                 -82.895d {-82d 53' 40"} (current),
                 -82.577d {-82d 34' 36"} (1950)
GRB_ERROR:       10.77 [deg radius, statistical plus systematic]
GRB_INTEN:       217 [cnts/sec]
DATA_SIGNIF:     6.10 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        15945 TJD;    19 DOY;   12/01/19
GRB_TIME:        14665.06 SOD {04:04:25.06} UT
GRB_PHI:         168.00 [deg]
GRB_THETA:       155.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.59
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      86%  GRB
2nd_MOST_LIKELY:   9%  Distant Particles
DETECTORS:       0,0,0, 0,0,0, 0,0,0, 0,1,1, 0,0,
SUN_POSTN:       300.58d {+20h 02m 20s}  -20.47d {-20d 27' 55"}
SUN_DIST:         70.50 [deg]   Sun_angle= 6.4 [hr] (West of Sun)
MOON_POSTN:      243.05d {+16h 12m 11s}  -21.81d {-21d 48' 36"}
MOON_DIST:        62.75 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      304.36,-20.08 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      255.46,-62.92 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 311.72,18.85 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(5.0<100sec) coincident with the SWIFT_BAT event (trignum=512035).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 19 Jan 12 04:05:02 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      57
TRIGGER_NUM:     348638667
GRB_RA:          123.017d {+08h 12m 04s} (J2000),
                 123.168d {+08h 12m 40s} (current),
                 122.390d {+08h 09m 34s} (1950)
GRB_DEC:          -3.517d {-03d 30' 59"} (J2000),
                  -3.553d {-03d 33' 11"} (current),
                  -3.366d {-03d 21' 57"} (1950)
GRB_ERROR:       8.08 [deg radius, statistical plus systematic]
GRB_INTEN:       336 [cnts/sec]
DATA_SIGNIF:     21.30 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        15945 TJD;    19 DOY;   12/01/19
GRB_TIME:        14665.06 SOD {04:04:25.06} UT
GRB_PHI:         177.00 [deg]
GRB_THETA:        70.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.67
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 0,0,0, 0,1,1, 0,0,
SUN_POSTN:       300.58d {+20h 02m 20s}  -20.47d {-20d 27' 55"}
SUN_DIST:        155.85 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      243.05d {+16h 12m 12s}  -21.81d {-21d 48' 37"}
MOON_DIST:       116.02 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      225.65, 16.15 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      126.19,-22.90 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 311.72,18.85 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(5.0<100sec) coincident with the SWIFT_BAT event (trignum=512035).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 19 Jan 12 04:05:09 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      69
TRIGGER_NUM:     348638667
GRB_RA:          113.617d {+07h 34m 28s} (J2000),
                 113.766d {+07h 35m 04s} (current),
                 112.998d {+07h 31m 59s} (1950)
GRB_DEC:          -4.850d {-04d 50' 59"} (J2000),
                  -4.877d {-04d 52' 36"} (current),
                  -4.740d {-04d 44' 22"} (1950)
GRB_ERROR:       5.78 [deg radius, statistical plus systematic]
GRB_INTEN:       472 [cnts/sec]
DATA_SIGNIF:     41.20 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        15945 TJD;    19 DOY;   12/01/19
GRB_TIME:        14665.06 SOD {04:04:25.06} UT
GRB_PHI:         167.00 [deg]
GRB_THETA:        70.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.78
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   2%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 0,0,0, 0,1,1, 0,0,
SUN_POSTN:       300.58d {+20h 02m 20s}  -20.47d {-20d 27' 55"}
SUN_DIST:        153.79 [deg]   Sun_angle= -11.5 [hr] (East of Sun)
MOON_POSTN:      243.05d {+16h 12m 12s}  -21.81d {-21d 48' 37"}
MOON_DIST:       123.65 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      222.22,  7.29 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      116.40,-26.15 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 311.72,18.85 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(5.0<100sec) coincident with the SWIFT_BAT event (trignum=512035).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 19 Jan 12 04:06:01 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     512035,   Seg_Num: 0
GRB_RA:          120.0293d {+08h 00m 07.03s} (J2000),
                 120.1744d {+08h 00m 41.85s} (current),
                 119.4271d {+07h 57m 42.50s} (1950)
GRB_DEC:          -9.0803d {-09d 04' 49.0"} (J2000),
                  -9.1139d {-09d 06' 50.1"} (current),
                  -8.9422d {-08d 56' 32.0"} (1950)
GRB_ERROR:       4.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.06e-08 [erg/cm2/sec]
GRB_SIGNIF:      14.69 [sigma]
IMG_START_DATE:  15945 TJD;    19 DOY;   12/01/19
IMG_START_TIME:  14723.49 SOD {04:05:23.49} UT,   53.3 [sec] since BAT Trigger Time
TAM[0-3]:        327.65 237.23 261.34 243.64
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       300.58d {+20h 02m 20s}  -20.47d {-20d 27' 55"}
SUN_DIST:        150.42 [deg]   Sun_angle= -12.0 [hr] (East of Sun)
MOON_POSTN:      243.06d {+16h 12m 14s}  -21.81d {-21d 48' 40"}
MOON_DIST:       116.03 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      229.09, 10.81 [deg] galactic lon,lat of the burst
ECL_COORDS:      124.40,-29.00 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.40 arcmin from the BAT position.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 19 Jan 12 04:06:10 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     512035,   Seg_Num: 0
GRB_RA:          120.0293d {+08h 00m 07.0s} (J2000),
                 120.1744d {+08h 00m 41.8s} (current),
                 119.4271d {+07h 57m 42.5s} (1950)
GRB_DEC:          -9.0803d {-09d 04' 49.0"} (J2000),
                  -9.1139d {-09d 06' 50.1"} (current),
                  -8.9422d {-08d 56' 32.0"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       216 [cnts]
IMG_START_DATE:  15945 TJD;    19 DOY;   12/01/19
IMG_START_TIME:  14723.49 SOD {04:05:23.49} UT,   53.3 [sec] since BAT Trigger Time
CENTROID_X:      282.90,  raw= 283  [pixels]
CENTROID_Y:      302.60,  raw= 303  [pixels]
ROLL:            181.05 [deg]
GAIN:            4
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   10.84
GRB_POS_XRT_Z:   -49.03
IMAGE_URL:       sw00512035000msxps_rw.img
SUN_POSTN:       300.58d {+20h 02m 20s}  -20.47d {-20d 27' 55"}
SUN_DIST:        150.42 [deg]   Sun_angle= -12.0 [hr] (East of Sun)
MOON_POSTN:      243.06d {+16h 12m 15s}  -21.81d {-21d 48' 40"}
MOON_DIST:       116.03 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      229.09, 10.81 [deg] galactic lon,lat of the burst
ECL_COORDS:      124.40,-29.00 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 19 Jan 12 04:06:17 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     512035,   Seg_Num: 0
GRB_RA:          120.0293d {+08h 00m 07.0s} (J2000),
                 120.1744d {+08h 00m 41.8s} (current),
                 119.4271d {+07h 57m 42.5s} (1950)
GRB_DEC:          -9.0803d {-09d 04' 49.0"} (J2000),
                  -9.1139d {-09d 06' 50.1"} (current),
                  -8.9422d {-08d 56' 32.0"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       216 [cnts]
IMG_START_DATE:  15945 TJD;    19 DOY;   12/01/19
IMG_START_TIME:  14723.49 SOD {04:05:23.49} UT,   53.3 [sec] since BAT Trigger Time
CENTROID_X:      282.90,  raw= 283  [pixels]
CENTROID_Y:      302.60,  raw= 303  [pixels]
ROLL:            181.05 [deg]
GAIN:            4
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   10.84
GRB_POS_XRT_Z:   -49.03
IMAGE_URL:       sw00512035000msxps_rw.img
SUN_POSTN:       300.58d {+20h 02m 20s}  -20.47d {-20d 27' 55"}
SUN_DIST:        150.42 [deg]   Sun_angle= -12.0 [hr] (East of Sun)
MOON_POSTN:      243.06d {+16h 12m 15s}  -21.81d {-21d 48' 41"}
MOON_DIST:       116.03 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      229.09, 10.81 [deg] galactic lon,lat of the burst
ECL_COORDS:      124.40,-29.00 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 19 Jan 12 04:08:05 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     348638667
GRB_RA:          116.820d {+07h 47m 17s} (J2000),
                 116.981d {+07h 47m 55s} (current),
                 116.151d {+07h 44m 36s} (1950)
GRB_DEC:          +6.520d {+06d 31' 12"} (J2000),
                  +6.490d {+06d 29' 22"} (current),
                  +6.644d {+06d 38' 39"} (1950)
GRB_ERROR:       8.28 [deg radius, statistical only]
DATA_SIGNIF:     9.70 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        15945 TJD;    19 DOY;   12/01/19
GRB_TIME:        14665.06 SOD {04:04:25.06} UT
GRB_PHI:         172.00 [deg]
GRB_THETA:        59.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       300.59d {+20h 02m 21s}  -20.47d {-20d 27' 54"}
SUN_DIST:        165.59 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:      243.08d {+16h 12m 19s}  -21.81d {-21d 48' 46"}
MOON_DIST:       125.84 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      213.42, 15.37 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      117.57,-14.39 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(5.0<100sec) coincident with the SWIFT_BAT event (trignum=512035).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 19 Jan 12 04:08:19 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      68
TRIGGER_NUM:     348638667
GRB_RA:          118.910d {+07h 55m 38s} (J2000),
                 119.056d {+07h 56m 13s} (current),
                 118.305d {+07h 53m 13s} (1950)
GRB_DEC:          -8.230d {-08d 13' 47"} (J2000),
                  -8.263d {-08d 15' 44"} (current),
                  -8.097d {-08d 05' 47"} (1950)
GRB_ERROR:       2.50 [deg radius, statistical only]
DATA_SIGNIF:     43.80 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        15945 TJD;    19 DOY;   12/01/19
GRB_TIME:        14665.06 SOD {04:04:25.06} UT
GRB_PHI:         172.00 [deg]
GRB_THETA:        74.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       300.59d {+20h 02m 21s}  -20.47d {-20d 27' 54"}
SUN_DIST:        151.23 [deg]   Sun_angle= -11.9 [hr] (East of Sun)
MOON_POSTN:      243.08d {+16h 12m 20s}  -21.81d {-21d 48' 47"}
MOON_DIST:       117.43 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      227.78, 10.27 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      122.96,-28.42 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(5.0<100sec) coincident with the SWIFT_BAT event (trignum=512035).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 19 Jan 12 04:08:27 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      71
TRIGGER_NUM:     348638667
GRB_RA:          119.520d {+07h 58m 05s} (J2000),
                 119.667d {+07h 58m 40s} (current),
                 118.909d {+07h 55m 38s} (1950)
GRB_DEC:          -7.030d {-07d 01' 47"} (J2000),
                  -7.063d {-07d 03' 46"} (current),
                  -6.894d {-06d 53' 38"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
DATA_SIGNIF:     86.70 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        15945 TJD;    19 DOY;   12/01/19
GRB_TIME:        14665.06 SOD {04:04:25.06} UT
GRB_PHI:         173.00 [deg]
GRB_THETA:        73.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       300.59d {+20h 02m 21s}  -20.47d {-20d 27' 54"}
SUN_DIST:        152.46 [deg]   Sun_angle= -11.9 [hr] (East of Sun)
MOON_POSTN:      243.08d {+16h 12m 20s}  -21.81d {-21d 48' 48"}
MOON_DIST:       117.50 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      227.02, 11.39 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      123.33,-27.12 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        Bright hard burst in the GBM.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(5.0<100sec) coincident with the SWIFT_BAT event (trignum=512035).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 19 Jan 12 04:08:32 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      74
TRIGGER_NUM:     348638667
GRB_RA:          119.460d {+07h 57m 50s} (J2000),
                 119.607d {+07h 58m 26s} (current),
                 118.849d {+07h 55m 24s} (1950)
GRB_DEC:          -7.010d {-07d 00' 35"} (J2000),
                  -7.043d {-07d 02' 34"} (current),
                  -6.874d {-06d 52' 27"} (1950)
GRB_ERROR:       1.39 [deg radius, statistical only]
DATA_SIGNIF:     88.50 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        15945 TJD;    19 DOY;   12/01/19
GRB_TIME:        14665.06 SOD {04:04:25.06} UT
GRB_PHI:         173.00 [deg]
GRB_THETA:        73.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       300.59d {+20h 02m 21s}  -20.47d {-20d 27' 53"}
SUN_DIST:        152.47 [deg]   Sun_angle= -11.9 [hr] (East of Sun)
MOON_POSTN:      243.09d {+16h 12m 21s}  -21.81d {-21d 48' 48"}
MOON_DIST:       117.56 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      226.98, 11.35 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      123.26,-27.11 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        Bright hard burst in the GBM.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(5.0<100sec) coincident with the SWIFT_BAT event (trignum=512035).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 19 Jan 12 04:08:29 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     512035,   Seg_Num: 0
POINT_RA:        120.026d {+08h 00m 06s} (J2000)
POINT_DEC:        -9.067d {-09d 04' 00"} (J2000)
POINT_ROLL:      181.050d
IMG_START_DATE:  15945 TJD;    19 DOY;   12/01/19
IMG_START_TIME:  14731.94 SOD {04:05:31.94} UT,   61.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.469
N_STARS:         190
X_OFFSET:        528 [pixels]
Y_OFFSET:        528 [pixels]
X_MAX:           1487 [pixels]
Y_MAX:           1487 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00512035000msufc0061.fits
SUN_POSTN:       300.59d {+20h 02m 21s}  -20.47d {-20d 27' 54"}
SUN_DIST:        150.43 [deg]   Sun_angle= -12.0 [hr] (East of Sun)
MOON_POSTN:      243.09d {+16h 12m 20s}  -21.81d {-21d 48' 48"}
MOON_DIST:       116.06 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      229.08, 10.81 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      124.40,-28.99 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 19 Jan 12 04:08:59 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     512035,   Seg_Num: 0
POINT_RA:        120.026d {+08h 00m 06s} (J2000)
POINT_DEC:        -9.067d {-09d 04' 00"} (J2000)
POINT_ROLL:      181.050d
IMG_START_DATE:  15945 TJD;    19 DOY;   12/01/19
IMG_START_TIME:  14731.94 SOD {04:05:31.94} UT,   61.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.469
N_STARS:         190
X_OFFSET:        528 [pixels]
Y_OFFSET:        528 [pixels]
X_MAX:           1487 [pixels]
Y_MAX:           1487 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00512035000msufc0061.fits
SUN_POSTN:       300.59d {+20h 02m 21s}  -20.47d {-20d 27' 53"}
SUN_DIST:        150.43 [deg]   Sun_angle= -12.0 [hr] (East of Sun)
MOON_POSTN:      243.09d {+16h 12m 22s}  -21.81d {-21d 48' 49"}
MOON_DIST:       116.07 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      229.08, 10.81 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      124.40,-28.99 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 19 Jan 12 04:09:58 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     512035,   Seg_Num: 0
POINT_RA:        120.026d {+08h 00m 06s} (J2000)
POINT_DEC:        -9.067d {-09d 04' 00"} (J2000)
ROLL:            181.050d
IMG_START_DATE:  15945 TJD;    19 DOY;   12/01/19
IMG_START_TIME:  14731.94 SOD {04:05:31.94} UT,   61.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     348638739
X_OFFSET:        877 [pixels]
Y_OFFSET:        814 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1037
Y_GRB_POS:       974
BINNING_INDEX:   1
IM_URL:          sw00512035000msuni0069.fits
SUN_POSTN:       300.59d {+20h 02m 21s}  -20.46d {-20d 27' 53"}
SUN_DIST:        150.43 [deg]   Sun_angle= -12.0 [hr] (East of Sun)
MOON_POSTN:      243.10d {+16h 12m 24s}  -21.81d {-21d 48' 52"}
MOON_DIST:       116.08 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      229.08, 10.81 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      124.40,-28.99 [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:     Thu 19 Jan 12 04:10:17 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     512035,   Seg_Num: 0
POINT_RA:        120.026d {+08h 00m 06s} (J2000)
POINT_DEC:        -9.067d {-09d 04' 00"} (J2000)
ROLL:            181.050d
IMG_START_DATE:  15945 TJD;    19 DOY;   12/01/19
IMG_START_TIME:  14731.94 SOD {04:05:31.94} UT,   61.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     348638739
X_OFFSET:        877 [pixels]
Y_OFFSET:        814 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1037
Y_GRB_POS:       974
BINNING_INDEX:   1
IM_URL:          sw00512035000msuni0069.fits
SUN_POSTN:       300.59d {+20h 02m 21s}  -20.46d {-20d 27' 53"}
SUN_DIST:        150.43 [deg]   Sun_angle= -12.0 [hr] (East of Sun)
MOON_POSTN:      243.10d {+16h 12m 25s}  -21.82d {-21d 48' 53"}
MOON_DIST:       116.08 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      229.08, 10.81 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      124.40,-28.99 [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:     Thu 19 Jan 12 04:11:24 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     512035,   Seg_Num: 0
POINT_RA:        120.028d {+08h 00m 07s} (J2000)
POINT_DEC:        -9.066d {-09d 03' 58"} (J2000)
POINT_ROLL:      181.047d
IMG_START_DATE:  15945 TJD;    19 DOY;   12/01/19
IMG_START_TIME:  14943.93 SOD {04:09:03.93} UT,   273.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.109
N_STARS:         74
X_OFFSET:        557 [pixels]
Y_OFFSET:        494 [pixels]
X_MAX:           1516 [pixels]
Y_MAX:           1453 [pixels]
DET_THRESH:      4
PHOTO_THRESH:    2
SL_URL:          sw00512035000msufc0273.fits
SUN_POSTN:       300.59d {+20h 02m 21s}  -20.46d {-20d 27' 52"}
SUN_DIST:        150.43 [deg]   Sun_angle= -12.0 [hr] (East of Sun)
MOON_POSTN:      243.12d {+16h 12m 28s}  -21.82d {-21d 48' 57"}
MOON_DIST:       116.09 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      229.08, 10.81 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      124.40,-28.99 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 19 Jan 12 04:11:55 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     512035,   Seg_Num: 0
POINT_RA:        120.028d {+08h 00m 07s} (J2000)
POINT_DEC:        -9.066d {-09d 03' 58"} (J2000)
POINT_ROLL:      181.047d
IMG_START_DATE:  15945 TJD;    19 DOY;   12/01/19
IMG_START_TIME:  14943.93 SOD {04:09:03.93} UT,   273.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.109
N_STARS:         74
X_OFFSET:        557 [pixels]
Y_OFFSET:        494 [pixels]
X_MAX:           1516 [pixels]
Y_MAX:           1453 [pixels]
DET_THRESH:      4
PHOTO_THRESH:    2
SL_URL:          sw00512035000msufc0273.fits
SUN_POSTN:       300.59d {+20h 02m 21s}  -20.46d {-20d 27' 52"}
SUN_DIST:        150.43 [deg]   Sun_angle= -12.0 [hr] (East of Sun)
MOON_POSTN:      243.12d {+16h 12m 29s}  -21.82d {-21d 48' 59"}
MOON_DIST:       116.09 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      229.08, 10.81 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      124.40,-28.99 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_srclist.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 19 Jan 12 04:12:42 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     512035,   Seg_Num: 0
POINT_RA:        120.028d {+08h 00m 07s} (J2000)
POINT_DEC:        -9.066d {-09d 03' 58"} (J2000)
ROLL:            181.047d
IMG_START_DATE:  15945 TJD;    19 DOY;   12/01/19
IMG_START_TIME:  14943.93 SOD {04:09:03.93} UT,   273.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     348638951
X_OFFSET:        877 [pixels]
Y_OFFSET:        814 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1037
Y_GRB_POS:       974
BINNING_INDEX:   1
IM_URL:          sw00512035000msuni0281.fits
SUN_POSTN:       300.59d {+20h 02m 22s}  -20.46d {-20d 27' 51"}
SUN_DIST:        150.43 [deg]   Sun_angle= -12.0 [hr] (East of Sun)
MOON_POSTN:      243.13d {+16h 12m 31s}  -21.82d {-21d 49' 01"}
MOON_DIST:       116.10 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      229.08, 10.81 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      124.40,-28.99 [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:     Thu 19 Jan 12 04:12:56 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     512035,   Seg_Num: 0
POINT_RA:        120.028d {+08h 00m 07s} (J2000)
POINT_DEC:        -9.066d {-09d 03' 58"} (J2000)
ROLL:            181.047d
IMG_START_DATE:  15945 TJD;    19 DOY;   12/01/19
IMG_START_TIME:  14943.93 SOD {04:09:03.93} UT,   273.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     348638951
X_OFFSET:        877 [pixels]
Y_OFFSET:        814 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1037
Y_GRB_POS:       974
BINNING_INDEX:   1
IM_URL:          sw00512035000msuni0281.fits
SUN_POSTN:       300.59d {+20h 02m 22s}  -20.46d {-20d 27' 51"}
SUN_DIST:        150.43 [deg]   Sun_angle= -12.0 [hr] (East of Sun)
MOON_POSTN:      243.13d {+16h 12m 32s}  -21.82d {-21d 49' 02"}
MOON_DIST:       116.10 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      229.08, 10.81 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      124.40,-28.99 [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:     Thu 19 Jan 12 04:12:58 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     512035,   Seg_Num: 0
GRB_RA:          120.0288d {+08h 00m 06.91s} (J2000),
                 120.1739d {+08h 00m 41.73s} (current),
                 119.4266d {+07h 57m 42.39s} (1950)
GRB_DEC:          -9.0815d {-09d 04' 53.4"} (J2000),
                  -9.1151d {-09d 06' 54.5"} (current),
                  -8.9434d {-08d 56' 36.4"} (1950)
GRB_ERROR:       0.7 [arcsec radius, statistical only]
GRB_MAG:         19.67 +/- 0.16 [mag]
FILTER:          10, White
IMG_START_DATE:  15945 TJD;    19 DOY;   12/01/19
IMG_START_TIME:  14731.00 SOD {04:05:31.00} UT,   60.8 [sec] since BAT Trigger Time
SUN_POSTN:       300.59d {+20h 02m 22s}  -20.46d {-20d 27' 51"}
SUN_DIST:        150.42 [deg]   Sun_angle= -12.0 [hr] (East of Sun)
MOON_POSTN:      243.13d {+16h 12m 32s}  -21.82d {-21d 49' 02"}
MOON_DIST:       116.09 [deg]
MOON_ILLUM:      20 [%]
GAL_COORDS:      229.09, 10.80 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      124.40,-29.00 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The UVOT position is 4.7 arcsec from the XRT position.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN Circular #12859
A. P. Beardmore (U Leicester), S. D. Barthelmy (GSFC), M. M. Chester (PSU), N. Gehrels (NASA/GSFC), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), N. P. M. Kuin (UCL-MSSL), O. M. Littlejohns (U Leicester), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), M. H. Siegel (PSU), C. A. Swenson (PSU) and T. N. Ukwatta (MSU) report on behalf of the Swift Team:
At 04:04:30.21 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 120119A (trigger=512035). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 120.027, -9.074, which is
```
   RA(J2000)  =  08h 00m 07s
   Dec(J2000) = -09d 04' 25"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows at least three peaks with a total duration of at least 50 sec. The peak count rate was ~16,000 counts/sec (15-350 keV), at ~10 sec after the trigger.
The XRT began observing the field at 04:05:23.4 UT, 53.3 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 120.0293, -9.0803 which is equivalent to:
```
   RA(J2000)  = +08h 00m 7.03s
   Dec(J2000) = -09d 04' 49.1"
```
with an uncertainty of 4.7 arcseconds (radius, 90% containment). This location is 24 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy.
The initial flux in the 2.5 s image was 1.06e-08 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 61 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	08:00:06.94 = 120.02890
  DEC(J2000) = -09:04:53.7  =  -9.08157
```
with a 90%-confidence error radius of about 0.66 arc sec. This position is 4.8 arc sec. from the center of the XRT error circle. The estimated magnitude is 19.67 with a 1-sigma error of about 0.16. No correction has been made for the expected extinction corresponding to E(B-V) of 0.11.
Burst Advocate for this burst is A. P. Beardmore (apb AT star.le.ac.uk). 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 #12860
A. N. Morgan, and J. S. Bloom (UC Berkeley) report:
We observed the field of GRB 120119A (Beardmore et al., GCN 12859) with the 1.3m PAIRITEL located at Mt. Hopkins, Arizona. Observations began at 2012-Jan-19 04h07m15s UT, ~2.7 minutes after the Swift trigger. In mosaics (effective exposure time of 560 seconds) taken simultaneously in the J, H, and Ks filters, we detect a source at the position of the optical afterglow.
The preliminary photometry yields:
```
post burst
t_mid (m)  exp.(s)  filt  mag    m_err
10.3       560      J     14.35  0.02
10.3       560      H     13.10  0.02
10.3       560      Ks    11.95  0.02
```
All magnitudes are given in the Vega system, calibrated to 2MASS. No correction for Galactic extinction has been made to the above reported values. Observations are continuing.
GCN Circular #12861
A. Gomboc (University of Ljubljana, CE Space.si) reports on behalf of a large collaboration: The 2-m Liverpool Telescope responded automatically to Swift trigger 512035. Following observations with RINGO-2 polarimeter, observations in r' i' and z' filter started at 14.5 min after the BAT trigger time. We clearly detect the afterglow in all three filters consistent with the UVOT position (Beardmore et al. GCN Circ. 12859).
GCN Circular #12863
P. Schady, V. Sudilovsky, J. Greiner (all MPE Garching) and T.Kruehler (DARK/NBI) report on behalf of the GROND team:
We observed the field of GRB 120119A (Swift trigger 512035; Beardmore et al., GCN #12859) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPI/ESO telescope at La Silla Observatory (Chile).
Observations started at 04:08 UT, 3.5 min after the GRB trigger, and are continuing. They were performed at an average seeing of 0.9" and at an average airmass of 1.0.
We found a single point source consistent with the UVOT afterglow position.
Based on the first 2.4 min of total exposures in g'r'i'z' and 4 min in JHK, we estimate preliminary magnitudes (all in AB) of
```
g' = 18.8 +- 0.1 mag,
r' = 17.7 +- 0.1 mag,
i' = 16.8 +- 0.1 mag,
z' = 16.2 +- 0.1 mag,
J  = 15.2 +- 0.1 mag,
H  = 14.6 +- 0.1 mag and
K  = 14.0 +- 0.1 mag
```
Given magnitudes are calibrated against SDSS zeropoints as well as 2MASS field stars and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.11 mag in the direction of the burst (Schlegel et al. 1998).
GCN Circular #12864
A. LaCluyze, J. Haislip, K. Ivarsen, D. Reichart, J. Moore, M. Nysewander, A. Trotter, R. Egger, A. Foster, A. Oza, T. Cromartie, E. Speckhard, and J. A. Crain report:
Skynet observed the field of GRB 120119A with the PROMPT telescopes located at CTIO in Chile. Observations in B, R, and I began at 04:05:08 UT, 38 seconds after the burst. We detect an optical source consistent with the UVOT position reported by Beardmore et. al. (GCN 12859) in all three filters. The optical afterglow faded for the first ~2.3 minutes, then brightened until approximately minute 14, after which it resumed fading. The afterglow is red, with (I - R) ~ 1 mag and (R - B) ~ 2 mag.
A preliminary light curve can be found at: http://skynet.unc.edu/grb/grb120119a.png
Further observations are ongoing.
GCN Circular #12865
A. Cucchiara, J. X. Prochaska (UCSC/UCO Lick) report on behalf of a larger collaboration:
On January 19.20 UT (53 minutes after the BAT trigger) we observed the optical counterpart of GRB 120119A (Beardmore et al., GCN 12859) using GMOS-South on the Gemini-South 8-m telescope.
Spectroscopic observation covering 4000-8000 Angstrom wavelength range reveals several absorption features, including AlIII1854, 1862, FeII2586,2600, MnII2606, MgII2796,2803 at a common redshift of 1.728. Also at least an intervening system is present at z=1.212 based on strong MgII2796 absorption features.
We therefore suggest this to be the redshift of GRB 120119A.
We thank the Gemini staff for performing this observation.
GCN Circular #12866
Anna Pancoast (UCSB), Rebecca Rosen (Cal Poly), Vardha Bennert (Cal Poly), A. Cucchiara (UCO) and J. Xavier Prochaska (UCO) on behalf of GRAASP report:
"We observed the afterglow of GRB 120119 with the Kast dual spectrometer for 1800s total starting at UT 05:30 under fine conditions. Analysis of the red side exposure shows strong absorption from ZnII and FeII transitions at a common redshift of z=1.73 confirming the reported redshift of Cucciara & Prochaska (GCN 12865).
Further analysis is in progress.
This GCN may be cited.
GCN Circular #12867
D. Milisavljevic, M. Drout, and E. Berger (Harvard) report:
"We obtained an optical spectrum of GRB 120119A (GCN 12859) with the Blue Channel spectrograph mounted on the MMT 6.5-m telescope. In a single 1800 sec exposure covering 3500-8500 Ang we find a wide range of absorption features (from CII1335 to MgI2853) at a common redshift of z=1.728, confirming the results of Cucchiara & Prochaska (GCN 12865)."
GCN Circular #12871
L. Elenin (KIAM), A. Volnova (SAI MSU), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 120119A (Beardmore et al., GCN 12859) with 0.45-m telescope ISON-NM observatory on Jan. 19. We took several unfiltered images of 60 s exposure on Jan.19, starting (UT) 05:19:52. We clearly detect the OT source (Beardmore et al., GCN 12859). Coordinates of the source are (J2000) 08 00 06.96 -09 04 54.4 which is consistent with UVOT position (GCN 12859). Photometry of the source is based on SDSS star J080000.59-090624.3 (08:00:00.60 -09:06:24.4) assuming R=16.42:
```
t-t0             filter      Exp.        OT
(mid, days)             (s)

0.05234    none     600   18.97  +/-    0.09
0.06039    none     600   18.84  +/-    0.08
0.06837    none     600   19.13  +/-    0.11
0.08321    none    1500   19.51  +/-    0.07
0.10178    none    1500   19.70  +/-    0.08
0.12128    none    1500   19.99  +/-    0.08
0.13989    none    1500   19.86  +/-    0.08
```
Looking for the photometry result one can suggest either plateau phase or the start of a re-brightening episode at ~ 0.14d.
GCN Circular #12872
S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, report:
The long GRB 120119A (Swift-BAT trigger #512035: Beardmore et al., GCN 12859) triggered Konus-Wind at T0=3D14674.872s UT (04:01:34.872)
The burst light curve shows a multi-peaked pulse with a total duration of ~61 s. The emission is seen up to ~7 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB120119_T14674/
As observed by Konus-Wind the burst had a fluence of (4.7 =B1 0.6)x10-5 erg/cm2, and a 256-ms peak flux, measured from T0+16.384 s, of (3.9 =B1 0.5)x10-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum of the burst (measured from T0 to T0+49.152 s) is best fitted in the 20 keV - 10 MeV range with the GRB (Band) model, for which: the low-energy photon index alpha =3D -0.85 (-0.16, +0.20), the high energy photon index beta =3D -2.34 (-0.22, +0.15), the peak energy Ep =3D 153(-19, +21) keV, chi2 =3D 73.5/84 dof.
The spectrum of the initial pulse (measured from T0 to T0+16.384 s) is best fitted is best fitted in the 20 keV - 10 MeV range with the GRB (Band) model, for which: the low-energy photon index alpha =3D -0.92 (-0.13, +0.14), the high energy photon index beta =3D -2.41 (-0.35, +0.16), the peak energy Ep =3D 192(-21, +29) keV, chi2 =3D 72.4/84 dof.
Assuming the redshift z=3D1.73 (Cucchiara & Prochaska, GCN 12865; Pancoast et al., GCN 12866; Milisavljevic et al., GCN 12867) and a standard cosmology model with H_0 =3D 71 km/s/Mpc, Omega_M =3D 0.27, Omega_Lambda =3D 0.73, the isotropic energy release E_iso is (3.6 =B1 0.5)x10^53 erg, the isotropic peak luminosity L_iso_max is (5.1 =B1 0.7)x10^52 erg/s, and Ep_rest is (265 =B1 35) keV.
All the quoted results are preliminary. All the quoted errors are at the 90% confidence level.
GCN Circular #12874
David Gruber (MPE) reports on behalf of the Fermi GBM Team:
"At 04:04:25.06 UT on 19 January 2012, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 120119A (trigger 348638667 / 120119170). which was also detected by the Swift/BAT and Swift/XRT (Beardmore et al. 2012, GCN 12859) The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 31.4 degrees.
This burst was also independently detected by INTEGRAL SPI-ACS.
The GBM light curve shows several overlapping pulses with a duration (T90) of about 55 s (50-300 keV). The time-averaged spectrum from T0-1.5 s to T0+53.8 s is best fit by a Band function with Epeak = 189.2 +/- 8.3 keV, alpha = -0.98 +/- 0.03, and beta = -2.36 +/- 0.09.
The event fluence (10-1000 keV) in this time interval is (3.87 +/- 0.01)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+14.5 s in the 10-1000 keV band is 16.86 +/- 0.39 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #12876
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 6070 s of XRT Photon Counting mode data and 12 UVOT images for GRB 120119A, 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 = 120.02875, -9.08177 which is equivalent to:
```
RA (J2000): 08h 00m 6.90s
Dec (J2000): -09d 04' 54.4"
```
with an uncertainty of 1.4 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 #12877
V. D'Elia (ASDC), V. Mangano (INAF-IASFPA), M.C. Stroh (PSU), D.N. Burrows (PSU), J.A. Kennea (PSU), K.L. Page (U. Leicester), C. Pagani (U. Leicester), A. Melandri (INAF-OAB) and A.P. Beardmore report on behalf of the Swift-XRT team:
We have analysed 9.1 ks of XRT data for GRB 120119A (Beardmore et al. GCN Circ. 12859), from 59 s to 30.4 ks after the BAT trigger. The data comprise 332 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN. Circ 12876).
The light curve can be modelled with an initial power-law decay with an index of alpha=2.58 (+/-0.08), followed by a break at T+167 s to an alpha of 1.008 (+0.017, -0.018).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.93 (+/-0.07). The best-fitting absorption column is 2.18 (+0.22, -0.21) x 10^21 cm^-2, in excess of the Galactic value of 7.9 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 1.68 (+0.13, -0.12) and a best-fitting absorption column of 2.1 (+0.5, -0.4) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.7 x 10^-11 (6.0 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.1 (+0.5, -0.4) x 10^21 cm^-2
Galactic foreground: 7.9 x 10^20 cm^-2
Excess significance: 4.9 sigma
Photon index:	     1.68 (+0.13, -0.12)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00512035.
This circular is an official product of the Swift-XRT team.
GCN Circular #12878
B. E. Cobb (GWU), reports:
Using the ANDICAM instrument on the 1.3m telescope at CTIO, we obtained optical/IR imaging of the error region of GRB 120119A (GCN 12859, Beardmore et al.) over several epochs, starting ~0.6 hours post-burst. For the first epoch, several dithered images were obtained in each filter, with total summed exposure times of 180s in each of BRIJK and 120s in each of H and V. For later epochs, total summed exposure times amounted to 15 minutes in I and V and 12 minutes in J and K.
At a mid-exposure time of 2012-01-19 04:43 UT (0.64 hrs post-burst), the GRB afterglow (e.g. GCN 12859, Beardmore et al., GCN 12860, Morgan et al., GCN 12863, Schady et al.) is detected with the following magnitudes:
```
B = 20.07 +/- 0.06
V = 18.91 +/- 0.05
R = 18.02 +/- 0.03
I = 16.96 +/- 0.03
J = 15.14 +/- 0.05
H = 14.02 +/- 0.06
K = 12.89 +/- 0.10
```
Between about 0.6 hrs and 3 hrs post-burst, the GRB afterglow fades with a decay rate of approximately alpha = 1.6 (where afterglow flux is proportional to t^-alpha).
```
time
post-burst      I-band magnitude
0.64 hrs        16.96 +/- 0.03
1.71 hrs        18.52 +/- 0.03
2.97 hrs        19.39 +/- 0.05
```
(Optical photometry is calibrated against Landolt standard stars and IR photometry is calibrated against 2MASS stars in the field.)

GCN Circular #12880
M. M. Chester (PSU) and A. P. Beardmore (U Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 120119A 62 s after the BAT trigger (Beardmore et al., GCN Circ. 12859). A source consistent with the XRT position (Beardmore et al., GCN Circ. 12876) is detected in the initial UVOT exposures.
The preliminary UVOT position is:

     RA  (J2000) =  08:00:06.93 = 120.02889 (deg.)
     Dec (J2000) = -09:04:53.7  =  -9.08159 (deg.)

with an estimated uncertainty of 0.59 arc sec. (radius, 90% confidence).
Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) are:

Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white_FC            62          211          147         19.5 +/- 0.1
white               62         1997          205         19.5 +/- 0.1
white             6130        30955         1112         21.9 +/- 0.4
v                 1682         2048           58        >19.1
v                 7810        12009          926        >20.8
b                 1608         1973           58         19.4 +/- 0.3
b                 5926        30829         1967        >22.0
u_FC               273          302           28        >18.7
u                  273         1948           66        >19.3
u                 5720        29917         1967        >21.7
w1                1731         1923           39        >19.1
w1               12921        25179         1511        >21.5
m2                1706         2073           58        >19.3
m2               12014        12914          885        >21.2
w2                1658         2022           58        >19.5
w2                6336         7804          242        >20.6

The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.11 in the direction of the burst (Schlegel et al. 1998).

GCN Circular #12881
L. Elenin (KIAM), A. Volnova (SAI MSU), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the Swift GRB 120119A (Beardmore et al., GCN 12859) with 0.45-m telescope ISON-NM observatory on Jan. 20 between (UT) 05:59:24 - 06:53:16. We do not detect the OT at the UVOT position reported in GCN 12880 (Chester et al.).
However we detect the source with coordiantes (J2000) 08 00 06.97 -09 04 56.6 with uncertainties of 0.1" (in both coordinates) which is differ from OT coordinates calculated in the first epoch of our observations (Elenin et al, GCN 12871). This source coincide with SDSS source SDSSJ080006.97-090456.8 (r=21.05) and is also visible at DSS2 image (R).
Photometry of this source at 1.0987 days after burst (mean time) is 21.1 +/- 0.2 and based on SDSS star J080005.86-090434.9 (J2000) 08 00 05.868 -09 04 34.91 assuming R=18.05.We suggest that the source could be a host galaxy of GRB 120119A. All results are preliminary.
GCN Circular #12882
D. Fugazza, P. D'Avanzo, A. Melandri (INAF-OAB), L. A. Antonelli (INAF-OAR/ASI-ASDC) report on behalf of the CIBO collaboration:
We observed the field of GRB 120119A (Beardmore et al., GCN 12859) with the REMIR infrared camera, mounted on the 60-cm robotic REM telescope at La Silla, starting 2.5 min after the burst.
The optical/NIR afterglow (Beardmore et al. GCN 12859; Morgan & Bloom GCN 12860; Gomboc GCN 12861; Schady et al. GCN 12863; Elenin et al. GCN 12871; Cobb GCN 12878) is clearly detected in the H-band. The light curve shows a plateau from about 4.5 min to 10 min after the burst with an observed magnitude of H~13.4, peaks at about T-T0=15 min with H~13.0 and then displays a significant decay. The last detection is at T-T0=3.8 hr with a magnitude of H~16.0.
The magnitudes are calibrated against the 2MASS catalogue.
GCN Circular #12883
Klotz A. (IRAP-CNRS-OMP), Gendre B. (ASDC/INAF-OAR), Boer M. (UNS-CNRS-OCA), Atteia J.L. (IRAP-CNRS-OMP) report:
We imaged the field of GRB 120119A detected by SWIFT (trigger 512035) with the TAROT robotic telescope (D=25cm) located at the European Southern Observatory, La Silla observatory, Chile.
The observations started 33.0s after the GRB trigger (9.2s after the notice) using the trigger time origin at 04:04:30.21 UT (Beardmore et al. GCNC 12859). The elevation of the field increased from 67 degrees above horizon and weather conditions were good. We observed during 4.35h until the dawn allowing a continuous follow up of the afterglow discovered by Beardmore et al. (GCNC 12859).
The first image is trailed with a duration of 60.0s (see the description in Klotz et al., 2006, A&A 451, L39). This image was obtained during the fading of the gamma emission. We extracted three measurements from the trail.
A first magnitude extraction is reported in the following table. As noticed by LaCluyze et al. (GCNC 12864), the optical emission decreased slowly in the range 33s to 200s, then it increased to reach a maximum R=16.8 at 850 +/- 50s. A decay phase alpha=1.3 occured between 10^3 and 10^4 seconds. As noticed by Elenin et al. (GCNC 12871) the begining of a plateau is suspected after 10^4 seconds. The end of the night over Chile does not allow to conclude definitively.
Note that the GRB was also observed at TAROT Calern (France) but data are poor due to the low elevation of the field. However, the afterglow is also detected in the TAROT Calern images.
```
------------------------------------------
  t1(min)    t2(min)     mag    dmag
------------------------------------------
     0.55       0.85    16.96    0.30
     0.85       1.15    17.15    0.30
     1.15       1.55    17.05    0.30
     1.67       2.17    17.32    0.16
     2.34       2.84    17.37    0.12
     3.01       3.51    17.58    0.22
     3.67       4.17    17.53    0.17
     4.34       4.84    17.27    0.17
    10.36      11.86    17.02    0.26
    12.03      13.53    16.87    0.20
    13.70      15.20    17.03    0.15
    15.37      16.87    16.94    0.18
    17.03      18.53    17.19    0.29
    18.70      20.20    17.19    0.11
    21.31      22.81    17.27    0.24
    22.97      24.47    17.37    0.16
    24.64      26.14    17.35    0.09
    26.31      27.81    17.32    0.19
    27.98      29.48    17.40    0.06
    29.64      31.14    17.59    0.05
    35.98      38.98    17.65    0.05
    39.15      42.15    18.00    0.21
    45.48      48.48    18.09    0.06
    48.65      51.65    18.31    0.25
    55.66      58.66    18.39    0.15
    58.83      61.83    18.58    0.26
    42.32      84.94    18.51    0.12
    65.16      91.28    19.10    0.15
    95.40     126.40    19.51    0.09
   129.73     195.34    19.78    0.12
   199.45     261.71    19.90    0.08
```
GCN Circular #12884
M. Stamatikos (OSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+395 sec from the recent telemetry downlink, we report further analysis of BAT GRB 120119A (trigger #512035) (Beardmore, et al., GCN Circ. 12859). The BAT ground-calculated position is RA, Dec = 120.029, -9.076 deg which is
```
    RA(J2000)  =  08h 00m 06.9s
    Dec(J2000) = -09d 04' 35.3"
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted light curve shows a series of three overlapping peaks running from T-10 sec to T+220 sec, with the bulk of emission before T+60 sec. T90 (15-350 keV) is 253.8 +- 24.5 sec (estimated error including systematics). Swift started to enter the South Atlantic Anomaly at T+ ~200 sec and collection of event data was terminated at T+395 sec.
The time-averaged spectrum from T-13.2 to T+361.9 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.38 +- 0.04. The fluence in the 15-150 keV band is 1.7 +- 0.0 x 10^-5 erg/cm2. The 1-sec peak photon flux measured from T+9.21 sec in the 15-150 keV band is 10.3 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/512035/BA/
GCN Circular #12892
V. Rumyantsev, K. Grankin (CrAO), A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration report:
We observed the field of the Swift GRB 120119A (Beardmore et al., GCN 12859) with AZT-11 telescope of CrAO observatory on Jan. 19. We took several images in R-filter under poor seeing (FWHM ~ 4.4") on Jan.19, between (UT) 18:35 - 19:59. We do not detect the OT (Beardmore et al. GCN 12859). Photometry is based on USNO-B1.0 star 0809-0167535 (08 00 04.98 -09 03 55.5) assuming R=16.22:
```
t-t0             filter      Exp.       UpperLimit
(mid, days)             (s)

0.6347        R       28x180     21.1 
```
GCN Circular #12894
T. Sakamoto (UMBC/GSFC), D. Donato (ORAU/GSFC), N. Gehrels (GSFC), T. Okajima (GSFC), Y. Urata (NCU)
We observed the field of GRB 120119A detected by Swift (trigger #512035; Beardmore et al., GCN Circ. 12859) with the 14-inch Goddard Robotic Telescope (GRT) located at the Goddard Geophysical and Astronomical Observatory (http://cddisa.gsfc.nasa.gov/ggao/).
A total 294 images of 5 sec (200 images), 30 sec (60 images) and 60 sec (34 images) exposures were taken in the R filter starting from January 19 04:06:42 (UT), about 132 seconds after the trigger (114 seconds after the BAT position notice), and stopped on January 19 06:07:50 (UT).
We detect the optical afterglow inside the XRT error circle (Beardmore et al., GCN Circ. 12876) in the stacked image of good quality 5 sec exposure images (total exposure of 985 sec). The estimated magnitude is R = 17.24 +- 0.19 mag (start time: 04:06:42, stop time: 04:44:37). We do not detected the afterglow in the stacked images of 30 sec exposure images (total exposure of 1560 sec) and 60 sec exposure images (total exposure of 2040 sec). The estimated five sigma upper limits of those stacked images are ~17.9 mag (start time: 04:44:55, stop time: 05:30:01) and ~18.0 mag (start time: 05:30:17, stop time: 06:07:50). All the reported magnitudes are estimated using the USNO-B1 catalog.
GCN Circular #12895
A. Zauderer and E. Berger (Harvard) report on behalf of a larger collaboration:
"We observed the position of GRB 120119A (GCN 12859) with the EVLA beginning 2012 Jan 21.2 UT (2.0 days after the burst) at a mean frequency of 5.8 GHz. No significant radio emission is detected at the enhanced Swift-XRT position (GCN 12876), the UVOT position (GCN 12859) or optical position (e.g. GCN 12881), to a three-sigma upper limit of 34 uJy."
GCN Circular #12897
Y. Urata (NCU), S. Takahashi, K.Y. Huang (ASIAA) and G. Petitpas (SMA)
We observed the field of GRB120119A (Siegel et al., GCN 12720) with the Sub-Millimeter Array (SMA). The observation in the 225 GHz band was started at January 19 11.1 UT (7.1 hours after the trigger). Our preliminary analysis show no counterpart brighter than 8.1 mJy (3-sigma).
GCN Circular #12898
M. Jang, M. Im (SNU), and Y. Urata (NCU) on behalf of EAFON
We observed GRB 120119A (GCN 12859, Beardmore et al.) in B,V,R- bands with a 1 m telescope at Mt. Lemmon, Arizona, US. The observation began at 06:03:31 UT, ~ 2 hours after burst alert. We took 3 frames for each filter with the exposure time, 300 secs
The afterglow candidate was detected in stacked images of all three filters with a preliminary magnitude R ~ 20.3 +/- 0.2 mag. The photometry calibration is based on two USNO B1.0 stars, USNO-B1.0 0809-0167573 and 0808-0168858
We thank the LOAO operator, J. Yoon for his help with the observation.
1305.1928 from 10 May 13
Adam N. Morgan et al.: Evidence for Dust Destruction from the Early-time Colour Change of GRB 120119A
We present broadband observations and analysis of Swift gamma-ray burst (GRB) 120119A. Our early-time afterglow detections began under 15 s after the burst in the host frame (redshift z = 1.73), and they yield constraints on the burst energetics and local environment. Late-time afterglow observations of the burst show evidence for a moderate column of dust (A_V ~ 1.1 mag) similar to, but statistically distinct from, dust seen along Small Magellanic Cloud sightlines. Deep late-time observations reveal a dusty, rapidly star-forming host galaxy. Most notably, our early-time observations exhibit a significant red-to-blue colour change in the first ~200 s after the trigger at levels heretofore unseen in GRB afterglows. This colour change, which is coincident with the final phases of the prompt emission, is a hallmark prediction of the photodestruction of dust in GRB afterglows. We test whether dust-destruction signatures are significantly distinct from other sources of colour change, namely a change in the intrinsic spectral index {\beta}. We find that a time-varying power-law spectrum alone cannot adequately describe the observed colour change, and allowing for dust destruction (via a time-varying A_V) significantly improves the fit. While not definitively ruling out other possibilities, this event provides the best support yet for the direct detection of dust destruction in the local environment of a GRB.
1503.03623 from 13 Mar 15
J. Japelj et al.: Spectrophotometric analysis of GRB afterglow extinction curves with X-shooter
In this work we use gamma-ray burst (GRB) afterglow spectra observed with the VLT/X-shooter spectrograph to measure rest-frame extinction in GRB lines-of-sight by modeling the broadband near-infrared (NIR) to X-ray afterglow spectral energy distributions (SEDs). Our sample consists of nine Swift GRBs, eight of them belonging to the long-duration and one to the short-duration class. Dust is modeled using the average extinction curves of the Milky Way and the two Magellanic Clouds. We derive the rest-frame extinction of the entire sample, which fall in the range $0 \lesssim {\it A}_{\rm V} \lesssim 1.2$. Moreover, the SMC extinction curve is the preferred extinction curve template for the majority of our sample, a result which is in agreement with those commonly observed in GRB lines-of-sights. In one analysed case (GRB 120119A), the common extinction curve templates fail to reproduce the observed extinction. To illustrate the advantage of using the high-quality X-shooter afterglow SEDs over the photometric SEDs, we repeat the modeling using the broadband SEDs with the NIR-to-UV photometric measurements instead of the spectra. The main result is that the spectroscopic data, thanks to a combination of excellent resolution and coverage of the blue part of the SED, are more successful in constraining the extinction curves and therefore the dust properties in GRB hosts with respect to photometric measurements. In all cases but one the extinction curve of one template is preferred over the others. We show that the modeled values of the extinction and the spectral slope, obtained through spectroscopic and photometric SED analysis, can differ significantly for individual events. Finally we stress that, regardless of the resolution of the optical-to-NIR data, the SED modeling gives reliable results only when the fit is performed on a SED covering a broader spectral region.

Back to JG's homepage

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