Gamma-ray Burst 170112A

(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 12 Jan 17 02:02:13 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     732188,   Seg_Num: 0
GRB_RA:           15.231d {+01h 00m 56s} (J2000),
                  15.442d {+01h 01m 46s} (current),
                  14.613d {+00h 58m 27s} (1950)
GRB_DEC:         -17.190d {-17d 11' 24"} (J2000),
                 -17.099d {-17d 05' 55"} (current),
                 -17.459d {-17d 27' 32"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       511 [cnts]    Image_Peak=66 [image_cnts]
TRIGGER_DUR:     0.064 [sec] 
TRIGGER_INDEX:   10418     E_range: 25-100 keV
BKG_INTEN:       27765 [cnts]
BKG_TIME:        7309.55 SOD {02:01:49.55} UT
BKG_DUR:         8 [sec]
GRB_DATE:        17765 TJD;    12 DOY;   17/01/12
GRB_TIME:        7320.11 SOD {02:02:00.11} UT
GRB_PHI:           2.06 [deg]
GRB_THETA:        16.10 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     19.20 [sigma]
IMAGE_SIGNIF:    7.88 [sigma]
MERIT_PARAMS:     +1  +0  +0  -4  +2  -2  +0  +0 -24  +0 
SUN_POSTN:       293.82d {+19h 35m 17s}  -21.63d {-21d 37' 51"}
SUN_DIST:         76.24 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      107.68d {+07h 10m 42s}  +18.70d {+18d 42' 04"}
MOON_DIST:        97.44 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      135.86,-79.82 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        6.97,-21.78 [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 = 201.03,-6.55 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 12 Jan 17 02:03:09 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     732188,   Seg_Num: 0
POINT_RA:         15.232d {+01h 00m 56s} (J2000)
POINT_DEC:       -17.188d {-17d 11' 15"} (J2000)
IMG_START_DATE:  17765 TJD;    12 DOY;   17/01/12
IMG_START_TIME:  7382.42 SOD {02:03:02.42} UT,   62.3 [sec] since BAT Trigger Time
COUNTS:          1    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        0    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 12 Jan 17 02:05:33 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     732188,   Seg_Num: 0
GRB_RA:           15.231d {+01h 00m 56s} (J2000),
                  15.442d {+01h 01m 46s} (current),
                  14.613d {+00h 58m 27s} (1950)
GRB_DEC:         -17.190d {-17d 11' 24"} (J2000),
                 -17.099d {-17d 05' 55"} (current),
                 -17.459d {-17d 27' 32"} (1950)
GRB_DATE:        17765 TJD;    12 DOY;   17/01/12
GRB_TIME:        7320.11 SOD {02:02:00.11} UT
TRIGGER_INDEX:   10418
GRB_PHI:           2.06 [deg]
GRB_THETA:        16.10 [deg]
DELTA_TIME:      64.00 [sec]
TRIGGER_DUR:     0.064 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     19.20 [sigma]
IMAGE_SIGNIF:    7.88 [sigma]
LC_URL:          sw00732188000msb.lc
SUN_POSTN:       293.83d {+19h 35m 18s}  -21.63d {-21d 37' 50"}
SUN_DIST:         76.24 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      107.71d {+07h 10m 51s}  +18.70d {+18d 41' 57"}
MOON_DIST:        97.48 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      135.86,-79.82 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        6.97,-21.78 [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 = 201.03,-6.55 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 12 Jan 17 02:06:03 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     732188,   Seg_Num: 0
POINT_RA:         15.232d {+01h 00m 56s} (J2000)
POINT_DEC:       -17.188d {-17d 11' 16"} (J2000)
POINT_ROLL:      251.367d
IMG_START_DATE:  17765 TJD;    12 DOY;   17/01/12
IMG_START_TIME:  7387.04 SOD {02:03:07.04} UT,   66.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.746
N_STARS:         15
X_OFFSET:        491 [pixels]
Y_OFFSET:        555 [pixels]
X_MAX:           1450 [pixels]
Y_MAX:           1514 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00732188000msufc0066.fits
SUN_POSTN:       293.83d {+19h 35m 18s}  -21.63d {-21d 37' 50"}
SUN_DIST:         76.24 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      107.72d {+07h 10m 52s}  +18.70d {+18d 41' 56"}
MOON_DIST:        97.48 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      135.86,-79.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.97,-21.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 12 Jan 17 02:06:33 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     732188,   Seg_Num: 0
POINT_RA:         15.232d {+01h 00m 56s} (J2000)
POINT_DEC:       -17.188d {-17d 11' 16"} (J2000)
POINT_ROLL:      251.367d
IMG_START_DATE:  17765 TJD;    12 DOY;   17/01/12
IMG_START_TIME:  7387.04 SOD {02:03:07.04} UT,   66.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.746
N_STARS:         15
X_OFFSET:        491 [pixels]
Y_OFFSET:        555 [pixels]
X_MAX:           1450 [pixels]
Y_MAX:           1514 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00732188000msufc0066.fits
SUN_POSTN:       293.83d {+19h 35m 18s}  -21.63d {-21d 37' 50"}
SUN_DIST:         76.24 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      107.72d {+07h 10m 53s}  +18.70d {+18d 41' 55"}
MOON_DIST:        97.48 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      135.86,-79.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.97,-21.78 [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 12 Jan 17 02:07:35 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     732188,   Seg_Num: 0
POINT_RA:         15.232d {+01h 00m 56s} (J2000)
POINT_DEC:       -17.188d {-17d 11' 16"} (J2000)
ROLL:            251.367d
IMG_START_DATE:  17765 TJD;    12 DOY;   17/01/12
IMG_START_TIME:  7387.04 SOD {02:03:07.04} UT,   66.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     505879405
X_OFFSET:        810 [pixels]
Y_OFFSET:        874 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       970
Y_GRB_POS:       1034
BINNING_INDEX:   1
IM_URL:          sw00732188000msuni0085.fits
SUN_POSTN:       293.83d {+19h 35m 18s}  -21.63d {-21d 37' 49"}
SUN_DIST:         76.24 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      107.73d {+07h 10m 56s}  +18.70d {+18d 41' 52"}
MOON_DIST:        97.49 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      135.86,-79.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.97,-21.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 12 Jan 17 02:07:50 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     732188,   Seg_Num: 0
POINT_RA:         15.232d {+01h 00m 56s} (J2000)
POINT_DEC:       -17.188d {-17d 11' 16"} (J2000)
ROLL:            251.367d
IMG_START_DATE:  17765 TJD;    12 DOY;   17/01/12
IMG_START_TIME:  7387.04 SOD {02:03:07.04} UT,   66.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     505879405
X_OFFSET:        810 [pixels]
Y_OFFSET:        874 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       970
Y_GRB_POS:       1034
BINNING_INDEX:   1
IM_URL:          sw00732188000msuni0085.fits
SUN_POSTN:       293.83d {+19h 35m 18s}  -21.63d {-21d 37' 49"}
SUN_DIST:         76.24 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      107.74d {+07h 10m 56s}  +18.70d {+18d 41' 52"}
MOON_DIST:        97.50 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      135.86,-79.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.97,-21.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 12 Jan 17 02:14:47 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     732188,   Seg_Num: 0
POINT_RA:         15.234d {+01h 00m 56s} (J2000)
POINT_DEC:       -17.191d {-17d 11' 26"} (J2000)
POINT_ROLL:      251.367d
IMG_START_DATE:  17765 TJD;    12 DOY;   17/01/12
IMG_START_TIME:  7599.36 SOD {02:06:39.36} UT,   279.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.743
N_STARS:         56
X_OFFSET:        251 [pixels]
Y_OFFSET:        315 [pixels]
X_MAX:           1690 [pixels]
Y_MAX:           1754 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00732188000msufc0279.fits
SUN_POSTN:       293.83d {+19h 35m 20s}  -21.63d {-21d 37' 46"}
SUN_DIST:         76.23 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      107.81d {+07h 11m 14s}  +18.69d {+18d 41' 36"}
MOON_DIST:        97.56 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      135.88,-79.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.97,-21.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 12 Jan 17 02:15:10 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     732188,   Seg_Num: 0
POINT_RA:         15.234d {+01h 00m 56s} (J2000)
POINT_DEC:       -17.191d {-17d 11' 26"} (J2000)
POINT_ROLL:      251.367d
IMG_START_DATE:  17765 TJD;    12 DOY;   17/01/12
IMG_START_TIME:  7599.36 SOD {02:06:39.36} UT,   279.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.743
N_STARS:         56
X_OFFSET:        251 [pixels]
Y_OFFSET:        315 [pixels]
X_MAX:           1690 [pixels]
Y_MAX:           1754 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    3
SL_URL:          sw00732188000msufc0279.fits
SUN_POSTN:       293.83d {+19h 35m 20s}  -21.63d {-21d 37' 46"}
SUN_DIST:         76.23 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      107.81d {+07h 11m 15s}  +18.69d {+18d 41' 35"}
MOON_DIST:        97.57 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      135.88,-79.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.97,-21.78 [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 12 Jan 17 02:16:38 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     732188,   Seg_Num: 0
POINT_RA:         15.234d {+01h 00m 56s} (J2000)
POINT_DEC:       -17.191d {-17d 11' 26"} (J2000)
ROLL:            251.367d
IMG_START_DATE:  17765 TJD;    12 DOY;   17/01/12
IMG_START_TIME:  7599.36 SOD {02:06:39.36} UT,   279.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     505879617
X_OFFSET:        810 [pixels]
Y_OFFSET:        874 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       970
Y_GRB_POS:       1034
BINNING_INDEX:   1
IM_URL:          sw00732188000msuni0298.fits
SUN_POSTN:       293.83d {+19h 35m 20s}  -21.63d {-21d 37' 45"}
SUN_DIST:         76.23 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      107.83d {+07h 11m 19s}  +18.69d {+18d 41' 32"}
MOON_DIST:        97.58 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      135.88,-79.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.97,-21.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 12 Jan 17 02:16:57 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     732188,   Seg_Num: 0
POINT_RA:         15.234d {+01h 00m 56s} (J2000)
POINT_DEC:       -17.191d {-17d 11' 26"} (J2000)
ROLL:            251.367d
IMG_START_DATE:  17765 TJD;    12 DOY;   17/01/12
IMG_START_TIME:  7599.36 SOD {02:06:39.36} UT,   279.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     505879617
X_OFFSET:        810 [pixels]
Y_OFFSET:        874 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       970
Y_GRB_POS:       1034
BINNING_INDEX:   1
IM_URL:          sw00732188000msuni0298.fits
SUN_POSTN:       293.83d {+19h 35m 20s}  -21.63d {-21d 37' 45"}
SUN_DIST:         76.23 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      107.83d {+07h 11m 20s}  +18.69d {+18d 41' 31"}
MOON_DIST:        97.58 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      135.88,-79.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.97,-21.78 [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 #20436
B. Mingo (U Leicester), D. N. Burrows (PSU), C. Gronwall (PSU), J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 02:02:00 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 170112A (trigger=732188). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 15.231, -17.190 which is
```
   RA(J2000) = 01h 00m 56s
   Dec(J2000) = -17d 11' 24"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 0.1 sec. The peak count rate was ~4000 counts/sec (15-350 keV), at ~0.1 sec after the trigger.
The XRT began observing the field at 02:03:02.4 UT, 62.3 seconds after the BAT trigger. No source was detected in 368 s of promptly downlinked data. We are waiting for the full dataset to detect and localise the XRT counterpart.
UVOT took a finding chart exposure of 150 seconds with the White filter starting 66 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 25% of the BAT 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 BAT 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 0.02.
Burst Advocate for this burst is B. Mingo (bm188 AT 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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 12 Jan 17 02:37:44 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     732188,   Seg_Num: 0
POINT_RA:         15.234d {+01h 00m 56s} (J2000)
POINT_DEC:       -17.191d {-17d 11' 26"} (J2000)
POINT_ROLL:      251.367d
IMG_START_DATE:  17765 TJD;    12 DOY;   17/01/12
IMG_START_TIME:  8176.46 SOD {02:16:16.46} UT,   856.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.662
N_STARS:         122
X_OFFSET:        251 [pixels]
Y_OFFSET:        315 [pixels]
X_MAX:           1690 [pixels]
Y_MAX:           1754 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00732188000msufc0856.fits
SUN_POSTN:       293.85d {+19h 35m 24s}  -21.63d {-21d 37' 37"}
SUN_DIST:         76.22 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      108.05d {+07h 12m 13s}  +18.68d {+18d 40' 44"}
MOON_DIST:        97.78 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      135.88,-79.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.97,-21.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 12 Jan 17 02:38:22 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     732188,   Seg_Num: 0
POINT_RA:         15.234d {+01h 00m 56s} (J2000)
POINT_DEC:       -17.191d {-17d 11' 26"} (J2000)
POINT_ROLL:      251.367d
IMG_START_DATE:  17765 TJD;    12 DOY;   17/01/12
IMG_START_TIME:  8176.46 SOD {02:16:16.46} UT,   856.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.662
N_STARS:         122
X_OFFSET:        251 [pixels]
Y_OFFSET:        315 [pixels]
X_MAX:           1690 [pixels]
Y_MAX:           1754 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00732188000msufc0856.fits
SUN_POSTN:       293.85d {+19h 35m 24s}  -21.63d {-21d 37' 37"}
SUN_DIST:         76.22 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      108.06d {+07h 12m 14s}  +18.68d {+18d 40' 43"}
MOON_DIST:        97.79 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      135.88,-79.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.97,-21.78 [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 12 Jan 17 02:39:33 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     732188,   Seg_Num: 0
POINT_RA:         15.234d {+01h 00m 56s} (J2000)
POINT_DEC:       -17.191d {-17d 11' 26"} (J2000)
ROLL:            251.367d
IMG_START_DATE:  17765 TJD;    12 DOY;   17/01/12
IMG_START_TIME:  8176.46 SOD {02:16:16.46} UT,   856.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     505880194
X_OFFSET:        810 [pixels]
Y_OFFSET:        874 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       970
Y_GRB_POS:       1034
BINNING_INDEX:   1
IM_URL:          sw00732188000msuni0875.fits
SUN_POSTN:       293.85d {+19h 35m 24s}  -21.63d {-21d 37' 36"}
SUN_DIST:         76.22 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      108.07d {+07h 12m 17s}  +18.68d {+18d 40' 40"}
MOON_DIST:        97.80 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      135.88,-79.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.97,-21.78 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 12 Jan 17 02:39:58 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     732188,   Seg_Num: 0
POINT_RA:         15.234d {+01h 00m 56s} (J2000)
POINT_DEC:       -17.191d {-17d 11' 26"} (J2000)
ROLL:            251.367d
IMG_START_DATE:  17765 TJD;    12 DOY;   17/01/12
IMG_START_TIME:  8176.46 SOD {02:16:16.46} UT,   856.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     505880194
X_OFFSET:        810 [pixels]
Y_OFFSET:        874 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       970
Y_GRB_POS:       1034
BINNING_INDEX:   1
IM_URL:          sw00732188000msuni0875.fits
SUN_POSTN:       293.85d {+19h 35m 24s}  -21.63d {-21d 37' 36"}
SUN_DIST:         76.22 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:      108.08d {+07h 12m 18s}  +18.68d {+18d 40' 39"}
MOON_DIST:        97.80 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      135.88,-79.82 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        6.97,-21.78 [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 #20438
P. D'Avanzo, D. Fugazza, S. Covino, A. Melandri (INAF/OAB) report on behalf of the REM team:
We observed the field of the short GRB 170112A (Mingo et al., GCN 20436) with the 60-cm robotic telescope REM located at the La Silla Observatory (Chile). The observations started at 02:02:55 UT, 55 seconds after the burst, and were carried out simultaneously in the g, r, i, z and H bands.
A preliminary photometry of the first co-added images indicates that no obvious afterglow candidate is detected within the Swift/BAT error circle (Mingo et al. GCN 20436) down to the following 3sigma limiting magnitudes:
```
r > 18.8 at T-T0 = 763s
H > 18.0 at T-T0 = 730s
```
Magnitudes are in the AB system and have been calibrated with respect to the 2MASS (H-band) and APASS (r-band) catalogues.
GCN Circular #20439
R.Podesta, C.Lopez, F. Podesta Observatorio Astronomico Felix Aguilar (OAFA) , National University of San Juan, Argentina
H. Levato, C. Saffe Instituto de Ciencias Astronomicas,de la Tierra y del Espacio (ICATE), San Juan, Argentina
V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, A.V.Krylov, I.Gorbunov, P.Balanutsa, A.Kuznetsov, V.V.Chazov Lomonosov Moscow State University, Sternberg Astronomical Institut of MSU
K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk, O. Ershova Irkutsk State University
V.Yurkov, Yu.Sergienko Blagoveschensk Educational State University, Blagoveschensk
A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory
D.Buckley, S. Potter, A.Kniazev, M.Kotze South African Astronomical Observatory
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias
MASTER robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in OAFA was pointed to the GRB170112A 18 sec after notice time and 25 sec after trigger time at 2017-01-12 02:02:31 UT. On our first (10s exposure) set we haven`t found optical transient within SWIFT BAT error-box (Mingo et al., GCN 20436). The 5-sigma upper limit has been about 16.04mag The message may be cited.
The observations made on zenit distance = 54 degrees, galaxy latitude b = -79 degree. The moon (100 % bright part) is 30 degrees above the horizon. The distance between moon and object is 97 The sun altitude is -23.9 degree. The object can be observed till 2017-01-12 04:57:47
The message may be cited.
GCN Circular #20440
A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), D.N. Burrows (PSU), T.G.R. Roegiers (PSU), L.M. McCauley (PSU), S.L. Gibson (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester) reports on behalf of the Swift-XRT team:
We have analysed 5.7 ks of Photon Counting (PC) mode XRT data for the Swift/BAT-detected burst GRB 170112A, collected between T0+73 s and T0+13.3 ks.
No X-ray sources have been detected consistent with being within 296 arcsec of the Swift/BAT position. The 3-sigma upper limit in the field ranges from ~0.002 to ~0.003 ct s^-1, corresponding to a 0.3-10 keV observed flux of 7.8e-14 to 1.1e-13 erg cm^-2 s^-1 (assuming a typical GRB spectrum).
Six uncatalogued sources were detected too far from the GRB position to be likely afterglow candidates.
The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at http://www.swift.ac.uk/ToO_GRBs/00732188.
This circular is an official product of the Swift-XRT team.
GCN Circular #20443
A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), N. Gehrels (GSFC), H. A. Krimm (NSF/USRA), C. B. Markwardt (GSFC), J. P. Norris (BSU), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 170112A (trigger #732188) (Mingo, et al., GCN Circ. 20436). The BAT ground-calculated position is RA, Dec = 15.232, -17.233 deg which is
```
   RA(J2000)  =  01h 00m 55.7s
   Dec(J2000) = -17d 13' 57.9"
```
with an uncertainty of 2.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted light curve shows a single-peaked structure that starts and peaks at ~T0, and ends at ~T+0.06 s. T90 (15-350 keV) is 0.06 +- 0.02 sec (estimated error including systematics).
The time-averaged spectrum from T-0.00 to T+0.06 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.17 +- 0.34. The fluence in the 15-150 keV band is 1.3 +- 0.4 x 10^-8 erg/cm2. The 1-sec peak photon flux measured from T-0.47 sec in the 15-150 keV band is 0.3 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
Using a 16-ms binned light curve, the lag analysis finds a lag of 19 (-17, +36) ms for the 100-350 keV to 25-50 keV, -7 (-12, +14) ms for the 50-100 keV to 15-25 keV band, and 0 (-7, +7) ms for the 50-100 keV to 25-50 keV. These values are consistent with those of a short GRB. Moreover, no extended emission are found.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/732188/BA/
GCN Circular #20444
Eleonora Troja (GSFC), Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UVI), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jes=FAs Gonz=E1lez (UNAM), Carlos Rom=E1n-Z=FA=F1iga (UNAM), Neil Gehrels (GSFC), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report:
We observed the field of the short GRB 170112A (Mingo, et al., GCN 20436) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astron=F3mico Nacional on Sierra San Pedro M=E1rtir from 2017/01 12.15 to 2017/01 12.21 UTC (1.58 to 2.95 hours after the BAT trigger), obtaining a total of 0.76 hours exposure in the r and i bands and 0.32 hours exposure in the Z and Y bands.
Comparison to the DSS reveals no obvious new source brighter than about magnitude 19. However our data are deeper and we cannot yet exclude a fainter counterpart.
Further observations to check for variability are planned.
We thank the staff of the Observatorio Astron=F3mico Nacional in San Pedro M=E1rtir.
GCN Circular #20451
M. H. Siegel (PSU) and B. Mingo (U. Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 170112A 279 s after the BAT trigger (Mingo et al., GCN Circ. 20436). No optical afterglow consistent with the BAT position (Lien et al., GCN Circ. 20443) 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           856         1006          147         >20.5
u_FC               279          529          246         >19.9
white              856         6361          344         >21.0
v                 5136         6771          393         >19.2
b                 5956         6156          197         >20.0
u                  279         7338          593         >20.4
w1                5546         7180          393         >19.9
m2                5341         6975          393         >20.2
w2                6366         6566          197         >20.0
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.02 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #20472
E. Mazaeva (IKI), A. Pozanenko (IKI), R. Inasaridze (AbAO), A. Volnova (IKI), V. Ayvazian (AbAO), O.Kvaratskhelia (AbAO), G. Inasaridze (AbAO), I. Molotov (KIAM), report on behalf of larger GRB follow-up collaboration:
We observed the field of short GRB 170112A (Mingo et al., GCN 20436) with AS-32 (0.7m) telescope of Abastumani Observatory on Jan., 12 (UT) 15:35:30. We obtained several unfiltered images of the field. Within BAT error circle (Mingo et al., GCN 2043) we found the source which is absent in USNO-B1.0 at coordinates (J2000) 01:00:49.80 -17:10:17.5 with uncertainty of 0.9 arcsec in both coordinates. Finding chart can be found at http://grb.rssi.ru/GRB170112A/GRB170112A_AAO_170112.png The source is barely visible in DSS2 (R). Preliminary photometry of the source is following
```
Date        UT start   t-T0      Filter Exp.   OT    Err UpLim (3 sigma)
                       (mid, days)       (s)

2017-01-12  15:35:30   0.61446   CR     47*60  17.50 0.25  17.7
```
Photometry is based on nearby USNO-B1.0 stars USNO-B.1_id R2
```
0727-0016063 14.46
0728-0016765 15.73
0728-0016759 12.78
0728-0016802 14.33
```
The source above does not match any source of XRT observation (D'Ai et al., GCN 20440), see also http://www.swift.ac.uk/ToO_GRBs/00732188/

Back to JG's homepage

Jochen Greiner, last update: 16-Jan-2017 [Disclaimer]