Gamma-ray Burst 120116A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 16 Jan 12 18:06:47 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     511866,   Seg_Num: 0
GRB_RA:           16.248d {+01h 05m 00s} (J2000),
                  16.415d {+01h 05m 40s} (current),
                  15.557d {+01h 02m 14s} (1950)
GRB_DEC:         +33.929d {+33d 55' 44"} (J2000),
                 +33.993d {+33d 59' 36"} (current),
                 +33.661d {+33d 39' 40"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       6262 [cnts]    Image_Peak=853 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   137     E_range: 15-50 keV
BKG_INTEN:       23681 [cnts]
BKG_TIME:        65176.21 SOD {18:06:16.21} UT
BKG_DUR:         8 [sec]
GRB_DATE:        15942 TJD;    16 DOY;   12/01/16
GRB_TIME:        65188.05 SOD {18:06:28.05} UT
GRB_PHI:         -158.43 [deg]
GRB_THETA:        28.59 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     55.19 [sigma]
IMAGE_SIGNIF:    20.37 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +1  +7  +0  +0  +3  +0 
SUN_POSTN:       298.00d {+19h 52m 01s}  -20.94d {-20d 56' 38"}
SUN_DIST:         92.54 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      207.49d {+13h 49m 57s}  -15.05d {-15d 02' 49"}
MOON_DIST:       158.58 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      126.14,-28.86 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       28.64, 24.82 [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 = 0.84,-5.29 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 16 Jan 12 18:08:13 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     511866,   Seg_Num: 0
GRB_RA:           16.2416d {+01h 04m 57.98s} (J2000),
                  16.4086d {+01h 05m 38.05s} (current),
                  15.5500d {+01h 02m 12.00s} (1950)
GRB_DEC:         +33.9321d {+33d 55' 55.5"} (J2000),
                 +33.9964d {+33d 59' 47.1"} (current),
                 +33.6643d {+33d 39' 51.6"} (1950)
GRB_ERROR:       6.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       6.52e-10 [erg/cm2/sec]
GRB_SIGNIF:      5.65 [sigma]
IMG_START_DATE:  15942 TJD;    16 DOY;   12/01/16
IMG_START_TIME:  65262.50 SOD {18:07:42.50} UT,   74.4 [sec] since BAT Trigger Time
TAM[0-3]:        327.68 237.23 261.65 243.38
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       298.01d {+19h 52m 01s}  -20.94d {-20d 56' 38"}
SUN_DIST:         92.53 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      207.50d {+13h 50m 01s}  -15.05d {-15d 03' 04"}
MOON_DIST:       158.57 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      126.14,-28.86 [deg] galactic lon,lat of the burst
ECL_COORDS:       28.64, 24.82 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.38 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 16 Jan 12 18:08:23 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     511866,   Seg_Num: 0
GRB_RA:           16.2416d {+01h 04m 57.9s} (J2000),
                  16.4086d {+01h 05m 38.0s} (current),
                  15.5500d {+01h 02m 12.0s} (1950)
GRB_DEC:         +33.9321d {+33d 55' 55.5"} (J2000),
                 +33.9964d {+33d 59' 47.1"} (current),
                 +33.6643d {+33d 39' 51.6"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       32 [cnts]
IMG_START_DATE:  15942 TJD;    16 DOY;   12/01/16
IMG_START_TIME:  65262.50 SOD {18:07:42.50} UT,   74.4 [sec] since BAT Trigger Time
CENTROID_X:      292.62,  raw= 293  [pixels]
CENTROID_Y:      289.65,  raw= 290  [pixels]
ROLL:            246.21 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -19.66
GRB_POS_XRT_Z:   -26.10
IMAGE_URL:       sw00511866000msxps_rw.img
SUN_POSTN:       298.01d {+19h 52m 01s}  -20.94d {-20d 56' 38"}
SUN_DIST:         92.53 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      207.50d {+13h 50m 01s}  -15.05d {-15d 03' 06"}
MOON_DIST:       158.57 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      126.14,-28.86 [deg] galactic lon,lat of the burst
ECL_COORDS:       28.64, 24.82 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 16 Jan 12 18:08:36 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     511866,   Seg_Num: 0
GRB_RA:           16.2416d {+01h 04m 57.9s} (J2000),
                  16.4086d {+01h 05m 38.0s} (current),
                  15.5500d {+01h 02m 12.0s} (1950)
GRB_DEC:         +33.9321d {+33d 55' 55.5"} (J2000),
                 +33.9964d {+33d 59' 47.1"} (current),
                 +33.6643d {+33d 39' 51.6"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       32 [cnts]
IMG_START_DATE:  15942 TJD;    16 DOY;   12/01/16
IMG_START_TIME:  65262.50 SOD {18:07:42.50} UT,   74.4 [sec] since BAT Trigger Time
CENTROID_X:      292.62,  raw= 293  [pixels]
CENTROID_Y:      289.65,  raw= 290  [pixels]
ROLL:            246.21 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -19.66
GRB_POS_XRT_Z:   -26.10
IMAGE_URL:       sw00511866000msxps_rw.img
SUN_POSTN:       298.01d {+19h 52m 01s}  -20.94d {-20d 56' 38"}
SUN_DIST:         92.53 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      207.51d {+13h 50m 01s}  -15.05d {-15d 03' 08"}
MOON_DIST:       158.57 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      126.14,-28.86 [deg] galactic lon,lat of the burst
ECL_COORDS:       28.64, 24.82 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 16 Jan 12 18:10:08 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     511866,   Seg_Num: 0
GRB_RA:           16.248d {+01h 05m 00s} (J2000),
                  16.415d {+01h 05m 40s} (current),
                  15.557d {+01h 02m 14s} (1950)
GRB_DEC:         +33.929d {+33d 55' 44"} (J2000),
                 +33.993d {+33d 59' 36"} (current),
                 +33.661d {+33d 39' 40"} (1950)
GRB_DATE:        15942 TJD;    16 DOY;   12/01/16
GRB_TIME:        65188.05 SOD {18:06:28.05} UT
TRIGGER_INDEX:   137
GRB_PHI:         -158.43 [deg]
GRB_THETA:        28.59 [deg]
DELTA_TIME:      -63.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     55.19 [sigma]
IMAGE_SIGNIF:    20.37 [sigma]
LC_URL:          sw00511866000msb.lc
SUN_POSTN:       298.01d {+19h 52m 02s}  -20.94d {-20d 56' 37"}
SUN_DIST:         92.54 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      207.52d {+13h 50m 05s}  -15.06d {-15d 03' 24"}
MOON_DIST:       158.57 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      126.14,-28.86 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       28.64, 24.82 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 0.84,-5.29 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 16 Jan 12 18:11:03 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     511866,   Seg_Num: 0
POINT_RA:         16.252d {+01h 05m 01s} (J2000)
POINT_DEC:       +33.929d {+33d 55' 44"} (J2000)
POINT_ROLL:      246.210d
IMG_START_DATE:  15942 TJD;    16 DOY;   12/01/16
IMG_START_TIME:  65271.21 SOD {18:07:51.21} UT,   83.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.471
N_STARS:         27
X_OFFSET:        504 [pixels]
Y_OFFSET:        528 [pixels]
X_MAX:           1463 [pixels]
Y_MAX:           1487 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00511866000msufc0083.fits
SUN_POSTN:       298.01d {+19h 52m 02s}  -20.94d {-20d 56' 36"}
SUN_DIST:         92.54 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      207.53d {+13h 50m 07s}  -15.06d {-15d 03' 33"}
MOON_DIST:       158.57 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      126.15,-28.86 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       28.64, 24.82 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 16 Jan 12 18:11:35 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     511866,   Seg_Num: 0
POINT_RA:         16.252d {+01h 05m 01s} (J2000)
POINT_DEC:       +33.929d {+33d 55' 44"} (J2000)
POINT_ROLL:      246.210d
IMG_START_DATE:  15942 TJD;    16 DOY;   12/01/16
IMG_START_TIME:  65271.21 SOD {18:07:51.21} UT,   83.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.471
N_STARS:         27
X_OFFSET:        504 [pixels]
Y_OFFSET:        528 [pixels]
X_MAX:           1463 [pixels]
Y_MAX:           1487 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00511866000msufc0083.fits
SUN_POSTN:       298.01d {+19h 52m 02s}  -20.94d {-20d 56' 36"}
SUN_DIST:         92.54 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      207.53d {+13h 50m 08s}  -15.06d {-15d 03' 38"}
MOON_DIST:       158.57 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      126.15,-28.86 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       28.64, 24.82 [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 16 Jan 12 18:12:37 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     511866,   Seg_Num: 0
POINT_RA:         16.252d {+01h 05m 01s} (J2000)
POINT_DEC:       +33.929d {+33d 55' 44"} (J2000)
ROLL:            246.210d
IMG_START_DATE:  15942 TJD;    16 DOY;   12/01/16
IMG_START_TIME:  65271.21 SOD {18:07:51.21} UT,   83.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     348430079
X_OFFSET:        863 [pixels]
Y_OFFSET:        867 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1023
Y_GRB_POS:       1027
BINNING_INDEX:   1
IM_URL:          sw00511866000msuni0091.fits
SUN_POSTN:       298.01d {+19h 52m 02s}  -20.94d {-20d 56' 36"}
SUN_DIST:         92.54 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      207.55d {+13h 50m 11s}  -15.06d {-15d 03' 49"}
MOON_DIST:       158.57 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      126.15,-28.86 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       28.64, 24.82 [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 16 Jan 12 18:12:52 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     511866,   Seg_Num: 0
POINT_RA:         16.252d {+01h 05m 01s} (J2000)
POINT_DEC:       +33.929d {+33d 55' 44"} (J2000)
ROLL:            246.210d
IMG_START_DATE:  15942 TJD;    16 DOY;   12/01/16
IMG_START_TIME:  65271.21 SOD {18:07:51.21} UT,   83.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     348430079
X_OFFSET:        863 [pixels]
Y_OFFSET:        867 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1023
Y_GRB_POS:       1027
BINNING_INDEX:   1
IM_URL:          sw00511866000msuni0091.fits
SUN_POSTN:       298.01d {+19h 52m 02s}  -20.94d {-20d 56' 36"}
SUN_DIST:         92.54 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      207.55d {+13h 50m 11s}  -15.06d {-15d 03' 52"}
MOON_DIST:       158.57 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      126.15,-28.86 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       28.64, 24.82 [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 Circular #12834
A. Melandri (INAF-OAB), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), S. Campana (INAF-OAB), P. D'Avanzo (INAF-OAB), N. Gehrels (NASA/GSFC), J. A. Kennea (PSU), A. Y. Lien (NASA/GSFC/ORAU), D. M. Palmer (LANL), T. Sakamoto (NASA/UMBC), B. Sbarufatti (INAF-OAB/PSU), M. H. Siegel (PSU), R. L. C. Starling (U Leicester), C. A. Swenson (PSU), T. N. Ukwatta (MSU), C. A. Wolf (PSU) and B.-B. Zhang (PSU) report on behalf of the Swift Team:
At 18:06:28 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 120116A (trigger=511866). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 16.248, +33.929, which is
```
   RA(J2000)  =  01h 05m 00s
   Dec(J2000) = +33d 55' 44"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows at least two precursor peaks followed by a complex FRED peak with a total duration of at least 50 sec. The peak count rate was ~4000 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began observing the field at 18:07:42.5 UT, 74.4 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 16.24183, 33.93034 which is equivalent to:
```
   RA(J2000)  = 01h 04m 58.04s
   Dec(J2000) = +33d 55' 49.2"
```
with an uncertainty of 4.0 arcseconds (radius, 90% containment). This location is 19 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 4.64 x 10^20 cm^-2 (Kalberla et al. 2005).
The initial flux in the 2.5 s image was 6.52e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 83 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.05.
Burst Advocate for this burst is A. Melandri (andrea.melandri AT brera.inaf.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 16 Jan 12 18:18:54 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     511866,   Seg_Num: 0
POINT_RA:         16.253d {+01h 05m 01s} (J2000)
POINT_DEC:       +33.932d {+33d 55' 57"} (J2000)
POINT_ROLL:      246.213d
IMG_START_DATE:  15942 TJD;    16 DOY;   12/01/16
IMG_START_TIME:  65483.82 SOD {18:11:23.82} UT,   295.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.725
N_STARS:         19
X_OFFSET:        543 [pixels]
Y_OFFSET:        547 [pixels]
X_MAX:           1502 [pixels]
Y_MAX:           1506 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00511866000msufc0295.fits
SUN_POSTN:       298.01d {+19h 52m 03s}  -20.94d {-20d 56' 33"}
SUN_DIST:         92.54 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      207.61d {+13h 50m 26s}  -15.08d {-15d 04' 53"}
MOON_DIST:       158.56 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      126.15,-28.85 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       28.64, 24.82 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 16 Jan 12 18:19:16 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     511866,   Seg_Num: 0
POINT_RA:         16.253d {+01h 05m 01s} (J2000)
POINT_DEC:       +33.932d {+33d 55' 57"} (J2000)
POINT_ROLL:      246.213d
IMG_START_DATE:  15942 TJD;    16 DOY;   12/01/16
IMG_START_TIME:  65483.82 SOD {18:11:23.82} UT,   295.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.725
N_STARS:         19
X_OFFSET:        543 [pixels]
Y_OFFSET:        547 [pixels]
X_MAX:           1502 [pixels]
Y_MAX:           1506 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00511866000msufc0295.fits
SUN_POSTN:       298.01d {+19h 52m 03s}  -20.94d {-20d 56' 33"}
SUN_DIST:         92.54 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      207.61d {+13h 50m 26s}  -15.08d {-15d 04' 57"}
MOON_DIST:       158.56 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      126.15,-28.85 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       28.64, 24.82 [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 16 Jan 12 18:19:40 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     511866,   Seg_Num: 0
GRB_RA:           16.2417d {+01h 04m 58.00s} (J2000),
                  16.4087d {+01h 05m 38.08s} (current),
                  15.5501d {+01h 02m 12.03s} (1950)
GRB_DEC:         +33.9301d {+33d 55' 48.3"} (J2000),
                 +33.9944d {+33d 59' 39.9"} (current),
                 +33.6623d {+33d 39' 44.4"} (1950)
GRB_ERROR:       2.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15942 TJD;    16 DOY;   12/01/16
IMG_START_TIME:  65357.00 SOD {18:09:17.00} UT,   168.9 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       298.01d {+19h 52m 03s}  -20.94d {-20d 56' 32"}
SUN_DIST:         92.53 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      207.61d {+13h 50m 27s}  -15.08d {-15d 05' 01"}
MOON_DIST:       158.55 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      126.14,-28.86 [deg] galactic lon,lat of the burst
ECL_COORDS:       28.63, 24.82 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.11% < P(seren) < 0.58%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 16 Jan 12 18:20:25 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     511866,   Seg_Num: 0
POINT_RA:         16.253d {+01h 05m 01s} (J2000)
POINT_DEC:       +33.932d {+33d 55' 57"} (J2000)
ROLL:            246.213d
IMG_START_DATE:  15942 TJD;    16 DOY;   12/01/16
IMG_START_TIME:  65483.82 SOD {18:11:23.82} UT,   295.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     348430291
X_OFFSET:        863 [pixels]
Y_OFFSET:        867 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1023
Y_GRB_POS:       1027
BINNING_INDEX:   1
IM_URL:          sw00511866000msuni0303.fits
SUN_POSTN:       298.01d {+19h 52m 04s}  -20.94d {-20d 56' 32"}
SUN_DIST:         92.54 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      207.62d {+13h 50m 29s}  -15.09d {-15d 05' 09"}
MOON_DIST:       158.56 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      126.15,-28.85 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       28.64, 24.82 [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 16 Jan 12 18:20:37 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     511866,   Seg_Num: 0
POINT_RA:         16.253d {+01h 05m 01s} (J2000)
POINT_DEC:       +33.932d {+33d 55' 57"} (J2000)
ROLL:            246.213d
IMG_START_DATE:  15942 TJD;    16 DOY;   12/01/16
IMG_START_TIME:  65483.82 SOD {18:11:23.82} UT,   295.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     348430291
X_OFFSET:        863 [pixels]
Y_OFFSET:        867 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1023
Y_GRB_POS:       1027
BINNING_INDEX:   1
IM_URL:          sw00511866000msuni0303.fits
SUN_POSTN:       298.01d {+19h 52m 04s}  -20.94d {-20d 56' 32"}
SUN_DIST:         92.53 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      207.62d {+13h 50m 30s}  -15.09d {-15d 05' 11"}
MOON_DIST:       158.56 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      126.15,-28.85 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       28.64, 24.82 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 16 Jan 12 18:24:26 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     511866,   Seg_Num: 0
POINT_RA:         16.253d {+01h 05m 01s} (J2000)
POINT_DEC:       +33.933d {+33d 55' 57"} (J2000)
POINT_ROLL:      246.213d
IMG_START_DATE:  15942 TJD;    16 DOY;   12/01/16
IMG_START_TIME:  66061.38 SOD {18:21:01.38} UT,   873.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        0.783
N_STARS:         67
X_OFFSET:        303 [pixels]
Y_OFFSET:        307 [pixels]
X_MAX:           1742 [pixels]
Y_MAX:           1746 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00511866000msufc0873.fits
SUN_POSTN:       298.02d {+19h 52m 04s}  -20.94d {-20d 56' 30"}
SUN_DIST:         92.53 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      207.66d {+13h 50m 39s}  -15.10d {-15d 05' 50"}
MOON_DIST:       158.55 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      126.15,-28.85 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       28.64, 24.82 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 16 Jan 12 18:24:55 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     511866,   Seg_Num: 0
POINT_RA:         16.253d {+01h 05m 01s} (J2000)
POINT_DEC:       +33.933d {+33d 55' 57"} (J2000)
POINT_ROLL:      246.213d
IMG_START_DATE:  15942 TJD;    16 DOY;   12/01/16
IMG_START_TIME:  66061.38 SOD {18:21:01.38} UT,   873.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        0.783
N_STARS:         67
X_OFFSET:        303 [pixels]
Y_OFFSET:        307 [pixels]
X_MAX:           1742 [pixels]
Y_MAX:           1746 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00511866000msufc0873.fits
SUN_POSTN:       298.02d {+19h 52m 04s}  -20.94d {-20d 56' 30"}
SUN_DIST:         92.53 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      207.67d {+13h 50m 40s}  -15.10d {-15d 05' 55"}
MOON_DIST:       158.55 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      126.15,-28.85 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       28.64, 24.82 [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 16 Jan 12 18:25:43 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     511866,   Seg_Num: 0
POINT_RA:         16.253d {+01h 05m 01s} (J2000)
POINT_DEC:       +33.933d {+33d 55' 57"} (J2000)
ROLL:            246.213d
IMG_START_DATE:  15942 TJD;    16 DOY;   12/01/16
IMG_START_TIME:  66061.38 SOD {18:21:01.38} UT,   873.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     348430869
X_OFFSET:        862 [pixels]
Y_OFFSET:        866 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1022
Y_GRB_POS:       1026
BINNING_INDEX:   1
IM_URL:          sw00511866000msuni0881.fits
SUN_POSTN:       298.02d {+19h 52m 04s}  -20.94d {-20d 56' 29"}
SUN_DIST:         92.53 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      207.67d {+13h 50m 42s}  -15.10d {-15d 06' 03"}
MOON_DIST:       158.55 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      126.15,-28.85 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       28.64, 24.82 [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 16 Jan 12 18:25:57 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     511866,   Seg_Num: 0
POINT_RA:         16.253d {+01h 05m 01s} (J2000)
POINT_DEC:       +33.933d {+33d 55' 57"} (J2000)
ROLL:            246.213d
IMG_START_DATE:  15942 TJD;    16 DOY;   12/01/16
IMG_START_TIME:  66061.38 SOD {18:21:01.38} UT,   873.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     348430869
X_OFFSET:        862 [pixels]
Y_OFFSET:        866 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1022
Y_GRB_POS:       1026
BINNING_INDEX:   1
IM_URL:          sw00511866000msuni0881.fits
SUN_POSTN:       298.02d {+19h 52m 05s}  -20.94d {-20d 56' 29"}
SUN_DIST:         92.53 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      207.68d {+13h 50m 42s}  -15.10d {-15d 06' 05"}
MOON_DIST:       158.55 [deg]
MOON_ILLUM:      46 [%]
GAL_COORDS:      126.15,-28.85 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       28.64, 24.82 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #12835
V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina, N.Shatskiy, P.Balanutsa, V.V.Chazov, A.Kuznetsov, D.Zimnukhov, M. Kornilov, A.Kuznetsov, D.Zimnukhov, M. Kornilov, A.Sankovich, S. Shurpakov Moscow State University, Sternberg Astronomical Institute
K.Ivanov, V.A.Poleshchuk, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev,E.Konstantinov, Irkutsk State University
V.Krushinski, I.Zalozhnich, A. Popov Ural State University, Kourovka
E. Sinykov, V.Yurkov, Yu.Sergienko, D.Varda, Blagoveschensk Educational State University, Blagoveschensk
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory
MASTER II robotic double telescope (MASTER-Net: http://observ.pereplet.ru) located in Tunka was pointed to the GRB120116A 10 sec s after notice time and 31 sec after GRB time at 2012-01-16 18:06:59.889 UT.
On our first (10s exposure) set we haven`t found optical transient within SWIFT XRT error-box (Melandri et al, GCN Circ 12834) in both polarizations.
The 3-sigma unfiltered upper limit has been about 15.0 mag This circular was generated automatically.
The message may be cited.
GCN Circular #12836
U.Quadri, L.Strabla and R.Girelli report: We imaged the field of GRB 120116A detected by SWIFT(trigger 511866) with the robotic telescope of (IAU station 565) Bassano Bresciano Observatory, Italy.
The observations started 3min 41sec. after the GRB trigger,with our Schmidt telescope D=320 mm F/D=3.1.
Weather conditions were discrete.
We co-added a series of 15 exposures of 120sec.
We did not found any optical counterpart in the error box of the XRTcandidate (Melandri et al, GCN Circ 12834).
```
 Start      End       Vlim 
 03min      30min     17.0 
```
Magnitudes were estimated with the UCAC-3 catalog and are not corrected for galactic dust extinction.
The message may be cited.
GCN Circular #12837
R. Sanchez-Ramirez (IAA-CSIC), D. Jimenez Mejias (IAC), J.C. Tello (IAA-CSIC), A. de Ugarte Postigo (IAA-CSIC, DARK), J. Gorosabel (IAA-CSIC), report on behalf of a larger collaboration:
"We observed the field of GRB 120116A (Melandri et al., GCNC 12834) with the 82cm IAC80 telescope at the Observatorio del Teide, Tenerife, Spain. The observations were carried in the I-band on Jan 16.83154 -- 16.91640 UT (1.85-3.89 hours post burst) with a total exposure time of 22x300s. A preliminary analysis of the combined image shows no object brighter than I~21.8 inside the XRT error circle."
GCN Circular #12838
Paul Vreeswijk (U. Iceland), Don Pollacco, David Armstrong, Paul McDaid (Queens U. of Belfast), Dong Xu (WIS), A. De Cia and P=E1ll=20 Jakobsson (U. Iceland), report on behalf of a larger collaboration:
Using ALFOSC on the Nordic Optical Telescope (NOT) we have obtained Sloan r'- (3 x 600 s) and z'-band (6 x 300 s) imaging of the field of the Swift GRB 120116A (Melandri et al., GCN 12834), starting on 2012 January 16 at 19:59 UT, just under 2 hours after the burst. The observations were performed in clear conditions, with a seeing of about 1".
We do not detect any object within the XRT error circle, down to approximate limiting magnitudes of r'>24.1 and z'>22.4 (calibrated against the SDSS catalog).
GCN Circular #12839
D. M. Palmer (LANL), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), A. Melandri (INAF-OAB), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-61 to T+242 sec from the recent telemetry downlink, we report further analysis of BAT GRB 120116A (trigger #511866) (Melandri, et al., GCN Circ. 12834). The BAT ground-calculated position is RA, Dec = 16.240, 33.927 deg, which is
```
   RA(J2000)  =  01h 04m 57.7s 
   Dec(J2000) = +33d 55' 36.3" 
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 85%.
The mask-weighted light curve shows a couple small precursor peaks starting at ~T-30 sec. The main peak has a fast rise starting around T-2 sec, peaking at ~T+0 sec, and a roughly linear decay ending around T+30 sec. T90 (15-350 keV) is 41.0 +- 5.0 sec (estimated error including systematics).
The time-averaged spectrum from T-33.44 to T+26.57 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.31 +- 0.41, and Epeak of 19.4 +- 6.3 keV (chi squared 55.4 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 2.9 +- 0.1 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+0.00 sec in the 15-150 keV band is 4.1 +- 0.3 ph/cm2/sec. A fit to a simple power law gives a photon index of 2.70 +- 0.07 (chi squared 101.2 for 57 d.o.f.). All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/511866/BA/
GCN Circular #12840
S. Maticic, B. Dintinjana and H. Mikuz on behalf of PIKA observing program at Crni Vrh Observatory.
We observed the field of GRB 120116A (GCN 12834) from Crni Vrh Observatory with a 60 cm robotic telescope, R filter and CCD. Twenty consecutive exposures of 60 second duration were taken. First exposure started at 2012-01-16 18:07:47 UT, 79 seconds after the burst (60 seconds after the SWIFT trigger).
No optical candidate was detected within the uncertainty radius on single exposures, having R limiting magnitude 20.0 +/-0.2. Also we found no optical candidate on 20 sumed R images with total exposure of 1200 seconds and limiting R band magnitude 22.0 +/-0.2 (all magnitudes calibrated against the nearby USNO B1.0 R2 magnitude stars).
GCN Circular #12841
A.J. Levan, S. Parsons (U. Warwick), N.R. Tanvir, K. Wiersema (U. Leicester), T. R. Marsh (Warwick), S. Littlefair (Sheffield) report on behalf of a larger collaboration:
We observed the field of GRB 120116A (Melandri et al. GCN 12834) with ULTRACAM on the 4.2m William Herschel Telescope. Observations began approximately 2 hours after the trigger, and 45, 60 second exposures were obtained simultaneously in ug and r. In the XRT error circle we do not locate any sources to preliminary limiting magnitudes of g>25.4, r>24.8, calibrated against SDSS observations of the field.
GCN Circular #12842
A. Zauderer and E. Berger (Harvard) report on behalf of a larger collaboration:
"We observed the position of GRB 120116A (GCN 12834) beginning 2012 Jan 17.06 (0.3 d after the burst) with the EVLA at a mean frequency of 5.8 GHz. We find no significant radio emission at the Swift-XRT position (http://www.swift.ac.uk/sper/) to a 3-sigma limit of 45 uJy."
GCN Circular #12843
A.J. Levan (U. Warwick) and N.R. Tanvir (U. Leicester) report for a larger collaboration:
"We observed GRB 120116A (Melandri et al. GCN 12834) with Gemini North beginning at Jan 17 04:54, approximately 11 hours after the burst trigger. We obtained optical imaging in iz with GMOS and near-IR imaging in JHK with GNIRS. Within the XRT localization of the source we find a faint object at
```
RA(J2000) 01:04:57.84
DEC(J2000) 33:55:51.1
```
(error +/- 0.3") with preliminary magnitudes (calibrated against SDSS and 2MASS) of
```
i=24.7 +/- 0.2
z=24.7 +/- 0.3
J> 23.0 (3-sigma)
H=22.8 +/- 0.4
K=21.6 +/- 0.3
```
This object is a plausible counterpart for GRB 120116A. However, at present we cannot assess if the source is fading, as it is significantly fainter than earlier optical limits (Quadri et al. GCN 12836, Sanchez-Ramirez et al. GCN 12837, Vreeswijk et al. GCN 12838, Levan et al. GCN 12841). We further note that the probability of a chance alignment of an object with this magnitude within a 2" error XRT position is non-negligible.
We thank the staff of Gemini, in particular Richard McDermid for their assistance in acquiring these data. "
GCN Circular #12844
A. Volnova (SAI MSU), I. Korobtsev, E. Klunko (ISTP), A.Pozanenko (IKI) on behalf of larger GRB follow up collaboration =A0report:
We observed the field of the Swift GRB 120116A (Melandri et al., GCN 12834) with AZT-33IK telescope of Sayan observatory (Mondy) on Jan, 16 between (UT) 18:49:24 - 19:20:20, i.e. starting 40 minutes after the trigger. We took several series of 60 s exposures in R-filter. Within the XRT error circle (Melandri et al., GCN 12834) =A0we do not detect any source, in particular we do not detect the source reported by Levan and Tanvir (GCN 12843). The photometry is based on the USNO-B1.0 1239-0020213 star (RA=01 05 04.50, Dec=+33 55 37.7) assuming R2=16.36.
```
UT_start, =A0T0+, =A0 =A0 =A0 =A0Filter, =A0Exposure, =A0 =A0OT =A0 =A0 =A0=
 uplim,
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0d =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 3 sig=
ma
18:49:24 =A0 0.03815 =A0R =A0 =A0 =A0  =A029x60 =A0 =A0 =A0 =A0 n/d =A0 =A0=
   19.5
```
GCN Circular #12846
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 1642 s of XRT Photon Counting mode data and 3 UVOT images for GRB 120116A, 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 = 16.24134, +33.93057 which is equivalent to:
```
RA (J2000): 01h 04m 57.92s
Dec (J2000): +33d 55' 50.0"
```
with an uncertainty of 1.7 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #12847
A. Melandri (INAF-OAB), S. Campana (INAF-OAB) and P. D'Avanzo (INAF-OAB) report on behalf of the Swift-XRT team:
We have analysed 8.2 ks of XRT data for GRB 120116A (Melandri et al. GCN Circ. 12834), from 64 s to 35.1 ks after the BAT trigger. The data comprise 92 s in Windowed Timing (WT) mode (the first 9 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN. Circ 12846).
The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=3.9 (+0.9, -0.8). Centered at T+114 s there is a small flare. The light curve breaks again at T+205 s to a decay with alpha=0.42 (+0.09, -0.07), before a final break at T+8394 s s after which the decay index is 1.24 (+0.69, -0.24).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.93 (+0.33, -0.28). The best-fitting absorption column is 2.5 (+/-0.6) x 10^21 cm^-2, in excess of the Galactic value of 4.6 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 2.19 (+0.19, -0.18) and a best-fitting absorption column of 1.9 (+/-0.5) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.5 x 10^-11 (5.5 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.9 (+/-0.5) x 10^21 cm^-2
Galactic foreground: 4.6 x 10^20 cm^-2
Excess significance: 4.8 sigma
Photon index:	     2.19 (+0.19, -0.18)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00511866.
This circular is an official product of the Swift-XRT team.
GCN Circular #12848
N. P. M. Kuin (MSSL-UCL) and A. Melandri (INAF-OAB) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 120116A 83 s after the BAT trigger (Melandri et al., GCN Circ. 12834). No optical afterglow consistent with the enhanced XRT position Goad et al, GCN_Circ. 12846) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC            83          233          147         >21.0
u_FC               296          546          246         >20.1
white               83          919          192         >21.1
v                 4479         4679          197         >19.1
u                  296         5173          324         >20.4
w1                4889         5089          197         >20.2
m2                4684         4884          197         >19.8
w2                4274         4474          197         >20.5
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.05 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #12899
A. Volnova (SAI MSU), E. Litvinenko (UBAI), I. Molotov (KIAM), A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration report:
We observed the field of the Swift GRB 120116A (Melandri et al., GCN 12834) with ORI-40 telescope of Kitab ISON observatory on Jan. 16 starting (UT) 18:12:48, i.e. ~6 min after burst trigger. We obtained several unfiltered images with exposure of 60 seconds. On the stacked image we do not detect any source within the enhanced XRT error box (Goad et al., GCN 12846). The photometry is based on nearby reference stars of USNO-B1.0 (R2 magnitudes):
```
 Tstart UT,   T0+,      Filter,  Exposure, OT,   UL (3 sigma)
                (mid, d)             (s)

 18:12:48     0.01480 none    29x60      n/d   19.4
```
GCN Report 359.1
GCN_Report 359.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_359_1.pdf by A. Melandri at INAF-OAB titled: "Final Swift Observations of GRB 120116A"
GCN Circular #12906
V.V.Golovnya (Main Astro Obs, Kyiv) report:
We have undertaken the review of the sky area in vicinity of=20 GRB 120116A (M.R. Goad et al., GCN Circ.12846) on astronegatives, collected in Ukrainian NAS Main astronomical observatory plate=20 archive (1976-1996). All the plates with the possible object=20 appearance are digitized using Microtek ScanMaker 9800XL TMA=20 and Epson Expression 10000XL flatbed scanners and have been=20 placed into Golosiiv Plate Archive database DBGPA with open=20 access to them. The list of plates is given in the table:
```
YYYYMMDD/TimeUT	--Plates--	Exp.	LimMag	Star USNOA2=20
19770906/232931	GUA040C000721B	30.0	15.95	1200-00453119
19850919/225420	GUA040C000745A	16.0	15.95	1200-00453119
19860910/234443	GUA040C001009A	16.0	15.10	1200-00451448
19870917/232503	GUA040C001119A	16.0	15.55	1200-00452448
19871023/210844	GUA040C001139A	20.0	16.15	1200-00452199
19871024/204207	GUA040C001155A	17.0	15.10	1200-00451448
Plates: =96the plates archive identifier of DWA (D/F=3D400/2000,=20
GUA040C M=3D103"/mm) of the Ukrainian NAS Main Astro obs.
        (Marsden's number - 83) the plate number [1].
Exp.   - Duration of the maximum exposure (minutes).=20
LimMag - Limited V mag, derived in the 23 minutes area around=20
       the location given in M.R. Goad et al. GCN Circ. 12846:=20
       RA(J2000): 01h 04m 57.92s, Dec(J2000): +33d 55' 50.0"
Star USNOA2 - Comparison star.
```
The preview images of 6 areas together with =20 the 23x19 min.of arc area from SkyMap can be found in =20 http://gua.db.ukr-vo.org/img/grb/120116A/index.html The images with full resolution are available via e-mail on=20 demand.
References:
1.L.Pakuliak DATABASE of GOLOSIIV PLATE ARCHIVE (DBGPA V2.0), http://gua.db.ukr-vo.org

Back to JG's homepage

Jochen Greiner, last update: 31-Jan-2012 [Disclaimer]