Gamma-ray Burst 160216A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Feb 16 19:10:54 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     673978,   Seg_Num: 0
GRB_RA:          311.706d {+20h 46m 49s} (J2000),
                 312.112d {+20h 48m 27s} (current),
                 310.433d {+20h 41m 44s} (1950)
GRB_DEC:         -71.555d {-71d 33' 17"} (J2000),
                 -71.495d {-71d 29' 41"} (current),
                 -71.738d {-71d 44' 16"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       6310 [cnts]    Image_Peak=798 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       18973 [cnts]
BKG_TIME:        69016.14 SOD {19:10:16.14} UT
BKG_DUR:         8 [sec]
GRB_DATE:        17434 TJD;    47 DOY;   16/02/16
GRB_TIME:        69031.44 SOD {19:10:31.44} UT
GRB_PHI:         -24.74 [deg]
GRB_THETA:        41.21 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     74.18 [sigma]
IMAGE_SIGNIF:    20.11 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +6  +0  +0 -49  +0 
SUN_POSTN:       329.74d {+21h 58m 57s}  -12.32d {-12d 19' 26"}
SUN_DIST:         60.14 [deg]   Sun_angle= 1.2 [hr] (West of Sun)
MOON_POSTN:       75.72d {+05h 02m 53s}  +17.53d {+17d 31' 41"}
MOON_DIST:       116.94 [deg]
MOON_ILLUM:      66 [%]
GAL_COORDS:      322.62,-34.64 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      289.51,-50.93 [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 = 222.10,1.10 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Feb 16 19:12:38 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     673978,   Seg_Num: 0
GRB_RA:          311.6570d {+20h 46m 37.67s} (J2000),
                 312.0638d {+20h 48m 15.30s} (current),
                 310.3834d {+20h 41m 32.00s} (1950)
GRB_DEC:         -71.5552d {-71d 33' 18.7"} (J2000),
                 -71.4953d {-71d 29' 43.0"} (current),
                 -71.7379d {-71d 44' 16.5"} (1950)
GRB_ERROR:       5.4 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.32e-09 [erg/cm2/sec]
GRB_SIGNIF:      5.65 [sigma]
IMG_START_DATE:  17434 TJD;    47 DOY;   16/02/16
IMG_START_TIME:  69125.33 SOD {19:12:05.33} UT,   93.9 [sec] since BAT Trigger Time
TAM[0-3]:        327.70 237.21 261.63 243.28
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       329.74d {+21h 58m 57s}  -12.32d {-12d 19' 24"}
SUN_DIST:         60.14 [deg]   Sun_angle= 1.2 [hr] (West of Sun)
MOON_POSTN:       75.74d {+05h 02m 57s}  +17.53d {+17d 31' 46"}
MOON_DIST:       116.96 [deg]
MOON_ILLUM:      66 [%]
GAL_COORDS:      322.62,-34.63 [deg] galactic lon,lat of the burst
ECL_COORDS:      289.49,-50.92 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.92 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:     Tue 16 Feb 16 19:12:48 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     673978,   Seg_Num: 0
GRB_RA:          311.6570d {+20h 46m 37.6s} (J2000),
                 312.0638d {+20h 48m 15.3s} (current),
                 310.3834d {+20h 41m 32.0s} (1950)
GRB_DEC:         -71.5552d {-71d 33' 18.7"} (J2000),
                 -71.4953d {-71d 29' 43.0"} (current),
                 -71.7379d {-71d 44' 16.5"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       32 [cnts]
IMG_START_DATE:  17434 TJD;    47 DOY;   16/02/16
IMG_START_TIME:  69125.33 SOD {19:12:05.33} UT,   93.9 [sec] since BAT Trigger Time
CENTROID_X:      344.24,  raw= 344  [pixels]
CENTROID_Y:      334.39,  raw= 334  [pixels]
ROLL:            20.34 [deg]
GAIN:            2
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   86.25
GRB_POS_XRT_Z:   91.80
IMAGE_URL:       sw00673978000msxps_rw.img
SUN_POSTN:       329.74d {+21h 58m 57s}  -12.32d {-12d 19' 24"}
SUN_DIST:         60.14 [deg]   Sun_angle= 1.2 [hr] (West of Sun)
MOON_POSTN:       75.74d {+05h 02m 57s}  +17.53d {+17d 31' 47"}
MOON_DIST:       116.96 [deg]
MOON_ILLUM:      66 [%]
GAL_COORDS:      322.62,-34.63 [deg] galactic lon,lat of the burst
ECL_COORDS:      289.49,-50.92 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.  
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:     Tue 16 Feb 16 19:12:56 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     673978,   Seg_Num: 0
GRB_RA:          311.6570d {+20h 46m 37.6s} (J2000),
                 312.0638d {+20h 48m 15.3s} (current),
                 310.3834d {+20h 41m 32.0s} (1950)
GRB_DEC:         -71.5552d {-71d 33' 18.7"} (J2000),
                 -71.4953d {-71d 29' 43.0"} (current),
                 -71.7379d {-71d 44' 16.5"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       32 [cnts]
IMG_START_DATE:  17434 TJD;    47 DOY;   16/02/16
IMG_START_TIME:  69125.33 SOD {19:12:05.33} UT,   93.9 [sec] since BAT Trigger Time
CENTROID_X:      344.24,  raw= 344  [pixels]
CENTROID_Y:      334.39,  raw= 334  [pixels]
ROLL:            20.34 [deg]
GAIN:            2
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   86.25
GRB_POS_XRT_Z:   91.80
IMAGE_URL:       sw00673978000msxps_rw.img
SUN_POSTN:       329.74d {+21h 58m 57s}  -12.32d {-12d 19' 24"}
SUN_DIST:         60.14 [deg]   Sun_angle= 1.2 [hr] (West of Sun)
MOON_POSTN:       75.74d {+05h 02m 57s}  +17.53d {+17d 31' 47"}
MOON_DIST:       116.96 [deg]
MOON_ILLUM:      66 [%]
GAL_COORDS:      322.62,-34.63 [deg] galactic lon,lat of the burst
ECL_COORDS:      289.49,-50.92 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.  
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:     Tue 16 Feb 16 19:14:28 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     673978,   Seg_Num: 0
GRB_RA:          311.706d {+20h 46m 49s} (J2000),
                 312.112d {+20h 48m 27s} (current),
                 310.433d {+20h 41m 44s} (1950)
GRB_DEC:         -71.555d {-71d 33' 17"} (J2000),
                 -71.495d {-71d 29' 41"} (current),
                 -71.738d {-71d 44' 16"} (1950)
GRB_DATE:        17434 TJD;    47 DOY;   16/02/16
GRB_TIME:        69031.44 SOD {19:10:31.44} UT
TRIGGER_INDEX:   146
GRB_PHI:         -24.74 [deg]
GRB_THETA:        41.21 [deg]
DELTA_TIME:      71.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     74.18 [sigma]
IMAGE_SIGNIF:    20.11 [sigma]
LC_URL:          sw00673978000msb.lc
SUN_POSTN:       329.74d {+21h 58m 57s}  -12.32d {-12d 19' 23"}
SUN_DIST:         60.14 [deg]   Sun_angle= 1.2 [hr] (West of Sun)
MOON_POSTN:       75.75d {+05h 03m 01s}  +17.53d {+17d 31' 52"}
MOON_DIST:       116.96 [deg]
MOON_ILLUM:      66 [%]
GAL_COORDS:      322.62,-34.64 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      289.51,-50.93 [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 = 222.10,1.10 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Feb 16 19:17:25 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     673978,   Seg_Num: 0
POINT_RA:        311.754d {+20h 47m 01s} (J2000)
POINT_DEC:       -71.539d {-71d 32' 21"} (J2000)
POINT_ROLL:      20.340d
IMG_START_DATE:  17434 TJD;    47 DOY;   16/02/16
IMG_START_TIME:  69132.32 SOD {19:12:12.32} UT,   100.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        6.798
N_STARS:         71
X_OFFSET:        328 [pixels]
Y_OFFSET:        576 [pixels]
X_MAX:           1287 [pixels]
Y_MAX:           1535 [pixels]
DET_THRESH:      22
PHOTO_THRESH:    14
SL_URL:          sw00673978000msufc0100.fits
SUN_POSTN:       329.74d {+21h 58m 58s}  -12.32d {-12d 19' 20"}
SUN_DIST:         60.12 [deg]   Sun_angle= 1.2 [hr] (West of Sun)
MOON_POSTN:       75.78d {+05h 03m 08s}  +17.53d {+17d 32' 00"}
MOON_DIST:       116.96 [deg]
MOON_ILLUM:      66 [%]
GAL_COORDS:      322.63,-34.66 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      289.54,-50.92 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Feb 16 19:17:48 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     673978,   Seg_Num: 0
POINT_RA:        311.754d {+20h 47m 01s} (J2000)
POINT_DEC:       -71.539d {-71d 32' 21"} (J2000)
POINT_ROLL:      20.340d
IMG_START_DATE:  17434 TJD;    47 DOY;   16/02/16
IMG_START_TIME:  69132.32 SOD {19:12:12.32} UT,   100.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        6.798
N_STARS:         71
X_OFFSET:        328 [pixels]
Y_OFFSET:        576 [pixels]
X_MAX:           1287 [pixels]
Y_MAX:           1535 [pixels]
DET_THRESH:      22
PHOTO_THRESH:    14
SL_URL:          sw00673978000msufc0100.fits
SUN_POSTN:       329.74d {+21h 58m 58s}  -12.32d {-12d 19' 20"}
SUN_DIST:         60.12 [deg]   Sun_angle= 1.2 [hr] (West of Sun)
MOON_POSTN:       75.79d {+05h 03m 09s}  +17.53d {+17d 32' 02"}
MOON_DIST:       116.96 [deg]
MOON_ILLUM:      66 [%]
GAL_COORDS:      322.63,-34.66 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      289.54,-50.92 [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:     Tue 16 Feb 16 19:19:43 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     673978,   Seg_Num: 0
POINT_RA:        311.754d {+20h 47m 01s} (J2000)
POINT_DEC:       -71.539d {-71d 32' 21"} (J2000)
ROLL:            20.340d
IMG_START_DATE:  17434 TJD;    47 DOY;   16/02/16
IMG_START_TIME:  69132.32 SOD {19:12:12.32} UT,   100.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     477342748
X_OFFSET:        563 [pixels]
Y_OFFSET:        826 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       723
Y_GRB_POS:       986
BINNING_INDEX:   1
IM_URL:          sw00673978000msuni0116.fits
SUN_POSTN:       329.74d {+21h 58m 58s}  -12.32d {-12d 19' 18"}
SUN_DIST:         60.12 [deg]   Sun_angle= 1.2 [hr] (West of Sun)
MOON_POSTN:       75.81d {+05h 03m 13s}  +17.54d {+17d 32' 07"}
MOON_DIST:       116.97 [deg]
MOON_ILLUM:      66 [%]
GAL_COORDS:      322.63,-34.66 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      289.54,-50.92 [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:     Tue 16 Feb 16 19:19:59 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     673978,   Seg_Num: 0
POINT_RA:        311.754d {+20h 47m 01s} (J2000)
POINT_DEC:       -71.539d {-71d 32' 21"} (J2000)
ROLL:            20.340d
IMG_START_DATE:  17434 TJD;    47 DOY;   16/02/16
IMG_START_TIME:  69132.32 SOD {19:12:12.32} UT,   100.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     477342748
X_OFFSET:        563 [pixels]
Y_OFFSET:        826 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       723
Y_GRB_POS:       986
BINNING_INDEX:   1
IM_URL:          sw00673978000msuni0116.fits
SUN_POSTN:       329.74d {+21h 58m 58s}  -12.32d {-12d 19' 18"}
SUN_DIST:         60.12 [deg]   Sun_angle= 1.2 [hr] (West of Sun)
MOON_POSTN:       75.81d {+05h 03m 14s}  +17.54d {+17d 32' 08"}
MOON_DIST:       116.97 [deg]
MOON_ILLUM:      66 [%]
GAL_COORDS:      322.63,-34.66 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      289.54,-50.92 [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 #19014
E. Troja (NASA/GSFC/UMCP), S. D. Barthelmy (GSFC), D. N. Burrows (PSU), S. B. Cenko (GSFC), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), F. E. Marshall (NASA/GSFC), L. M. McCauley (PSU), T. G. R. Roegiers (PSU), B. Sbarufatti (INAF-OAB/PSU) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 19:10:31 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 160216A (trigger=673978). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 311.706, -71.555 which is
```
   RA(J2000)  =  20h 46m 49s
   Dec(J2000) = -71d 33' 17"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows several bright peaks with a duration of about 30 sec. The peak count rate was ~7000 counts/sec (15-350 keV), at ~3 sec after the trigger.
The XRT began observing the field at 19:12:05.3 UT, 93.9 seconds after the BAT trigger. The position determined from promptly downlinked data differs significantly from the on-board position, suggesting that the XRT may have centroided on a cosmic ray; the initial XRT position notice should be treated with caution. Using promptly downlinked data we find a fading, uncatalogued X-ray source located at RA, Dec 311.68630, -71.54787 which is equivalent to:
```
   RA(J2000)  = 20h 46m 44.71s
   Dec(J2000) = -71d 32' 52.3"
```
with an uncertainty of 3.9 arcseconds (radius, 90% containment). This location is 34 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (4.50 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 1.1 (+0.67/-0.50) x 10^22 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 100 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 E. Troja (eleonora.troja AT nasa.gov). 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:     Tue 16 Feb 16 19:28:54 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     673978,   Seg_Num: 0
GRB_RA:          311.6858d {+20h 46m 44.59s} (J2000),
                 312.0924d {+20h 48m 22.17s} (current),
                 310.4127d {+20h 41m 39.05s} (1950)
GRB_DEC:         -71.5479d {-71d 32' 52.4"} (J2000),
                 -71.4880d {-71d 29' 16.6"} (current),
                 -71.7307d {-71d 43' 50.6"} (1950)
GRB_ERROR:       3.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17434 TJD;    47 DOY;   16/02/16
IMG_START_TIME:  69169.00 SOD {19:12:49.00} UT,   137.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       329.75d {+21h 59m 00s}  -12.32d {-12d 19' 10"}
SUN_DIST:         60.14 [deg]   Sun_angle= 1.2 [hr] (West of Sun)
MOON_POSTN:       75.90d {+05h 03m 35s}  +17.54d {+17d 32' 35"}
MOON_DIST:       117.02 [deg]
MOON_ILLUM:      66 [%]
GAL_COORDS:      322.63,-34.64 [deg] galactic lon,lat of the burst
ECL_COORDS:      289.51,-50.92 [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:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Feb 16 19:38:14 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     673978,   Seg_Num: 0
POINT_RA:        310.962d {+20h 43m 51s} (J2000)
POINT_DEC:       -71.107d {-71d 06' 25"} (J2000)
POINT_ROLL:      21.522d
IMG_START_DATE:  17434 TJD;    47 DOY;   16/02/16
IMG_START_TIME:  69345.75 SOD {19:15:45.75} UT,   314.3 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        4.054
N_STARS:         28
X_OFFSET:        243 [pixels]
Y_OFFSET:        506 [pixels]
X_MAX:           1202 [pixels]
Y_MAX:           1465 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    9
SL_URL:          sw00673978000msufc0314.fits
SUN_POSTN:       329.75d {+21h 59m 01s}  -12.32d {-12d 19' 02"}
SUN_DIST:         59.81 [deg]   Sun_angle= 1.2 [hr] (West of Sun)
MOON_POSTN:       75.99d {+05h 03m 57s}  +17.55d {+17d 33' 02"}
MOON_DIST:       117.46 [deg]
MOON_ILLUM:      66 [%]
GAL_COORDS:      323.22,-34.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      289.46,-50.42 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Feb 16 19:38:30 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     673978,   Seg_Num: 0
POINT_RA:        310.962d {+20h 43m 51s} (J2000)
POINT_DEC:       -71.107d {-71d 06' 25"} (J2000)
POINT_ROLL:      21.522d
IMG_START_DATE:  17434 TJD;    47 DOY;   16/02/16
IMG_START_TIME:  69345.75 SOD {19:15:45.75} UT,   314.3 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        4.054
N_STARS:         28
X_OFFSET:        243 [pixels]
Y_OFFSET:        506 [pixels]
X_MAX:           1202 [pixels]
Y_MAX:           1465 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    9
SL_URL:          sw00673978000msufc0314.fits
SUN_POSTN:       329.75d {+21h 59m 01s}  -12.32d {-12d 19' 02"}
SUN_DIST:         59.81 [deg]   Sun_angle= 1.2 [hr] (West of Sun)
MOON_POSTN:       75.99d {+05h 03m 58s}  +17.55d {+17d 33' 03"}
MOON_DIST:       117.46 [deg]
MOON_ILLUM:      66 [%]
GAL_COORDS:      323.22,-34.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      289.46,-50.42 [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:     Tue 16 Feb 16 19:39:38 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     673978,   Seg_Num: 0
POINT_RA:        310.962d {+20h 43m 51s} (J2000)
POINT_DEC:       -71.107d {-71d 06' 25"} (J2000)
ROLL:            21.522d
IMG_START_DATE:  17434 TJD;    47 DOY;   16/02/16
IMG_START_TIME:  69345.75 SOD {19:15:45.75} UT,   314.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     477342961
X_OFFSET:        563 [pixels]
Y_OFFSET:        826 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       723
Y_GRB_POS:       986
BINNING_INDEX:   1
IM_URL:          sw00673978000msuni0330.fits
SUN_POSTN:       329.76d {+21h 59m 01s}  -12.32d {-12d 19' 01"}
SUN_DIST:         59.81 [deg]   Sun_angle= 1.2 [hr] (West of Sun)
MOON_POSTN:       76.00d {+05h 04m 00s}  +17.55d {+17d 33' 06"}
MOON_DIST:       117.47 [deg]
MOON_ILLUM:      66 [%]
GAL_COORDS:      323.22,-34.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      289.46,-50.42 [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:     Tue 16 Feb 16 19:39:56 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     673978,   Seg_Num: 0
POINT_RA:        310.962d {+20h 43m 51s} (J2000)
POINT_DEC:       -71.107d {-71d 06' 25"} (J2000)
ROLL:            21.522d
IMG_START_DATE:  17434 TJD;    47 DOY;   16/02/16
IMG_START_TIME:  69345.75 SOD {19:15:45.75} UT,   314.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     477342961
X_OFFSET:        563 [pixels]
Y_OFFSET:        826 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       723
Y_GRB_POS:       986
BINNING_INDEX:   1
IM_URL:          sw00673978000msuni0330.fits
SUN_POSTN:       329.76d {+21h 59m 01s}  -12.32d {-12d 19' 01"}
SUN_DIST:         59.81 [deg]   Sun_angle= 1.2 [hr] (West of Sun)
MOON_POSTN:       76.00d {+05h 04m 01s}  +17.55d {+17d 33' 07"}
MOON_DIST:       117.47 [deg]
MOON_ILLUM:      66 [%]
GAL_COORDS:      323.22,-34.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      289.46,-50.42 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Feb 16 19:52:32 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     673978,   Seg_Num: 0
GRB_RA:          311.6858d {+20h 46m 44.59s} (J2000),
                 312.0924d {+20h 48m 22.17s} (current),
                 310.4127d {+20h 41m 39.05s} (1950)
GRB_DEC:         -71.5479d {-71d 32' 52.4"} (J2000),
                 -71.4880d {-71d 29' 16.6"} (current),
                 -71.7307d {-71d 43' 50.6"} (1950)
GRB_ERROR:       3.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17434 TJD;    47 DOY;   16/02/16
IMG_START_TIME:  69169.00 SOD {19:12:49.00} UT,   137.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       329.76d {+21h 59m 03s}  -12.31d {-12d 18' 50"}
SUN_DIST:         60.15 [deg]   Sun_angle= 1.2 [hr] (West of Sun)
MOON_POSTN:       76.13d {+05h 04m 31s}  +17.56d {+17d 33' 44"}
MOON_DIST:       117.10 [deg]
MOON_ILLUM:      67 [%]
GAL_COORDS:      322.63,-34.64 [deg] galactic lon,lat of the burst
ECL_COORDS:      289.51,-50.92 [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:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN Circular #19015
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 400 s of XRT Photon Counting mode data and 1 UVOT images for GRB 160216A, 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 = 311.68414, -71.54837 which is equivalent to:
```
RA (J2000): 20h 46m 44.19s
Dec (J2000): -71d 32' 54.1"
```
with an uncertainty of 1.8 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #19016
N. P. M. Kuin (UCL-MSSL) and E. Troja (NASA/GSFC/UMCP) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 160216A 101 s after the BAT trigger (Troja et al., GCN Circ. 19014). No optical afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 19015) has been 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           101          251          147         >19.8
u_FC               314          564          246         >19.1
white              101         5921          541         >20.6
v                 4695         6301          364         >19.0
b                 4079         5716          393         >19.9
u                  314         5510          442         >19.3
w1                5105         5305          197         >19.4
m2                4900         5099          197         >19.7
w2                4490         6126          393         >20.4
```
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 #19018
A. D'Ai (INAF-IASFPA), A. Maselli (INAF-IASFPA), A. Melandri (INAF-OAB), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), C. Pagani (U. Leicester), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester) and E. Troja report on behalf of the Swift-XRT team:
We have analysed 7.5 ks of XRT data for GRB 160216A (Troja et al. GCN Circ. 19014), from 81 s to 34.6 ks after the BAT trigger. The data comprise 36 s in Windowed Timing (WT) mode (the first 8 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 19015).
The light curve can be modelled with a power-law decay with a decay index of alpha=0.996 (+0.026, -0.025).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.90 (+0.18, -0.17). The best-fitting absorption column is 5.4 (+1.2, -1.0) x 10^21 cm^-2, in excess of the Galactic value of 4.5 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.4 x 10^-11 (6.8 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     5.4 (+1.2, -1.0) x 10^21 cm^-2
Galactic foreground: 4.5 x 10^20 cm^-2
Excess significance: 7.8 sigma
Photon index:	     1.90 (+0.18, -0.17)
```
If the light curve continues to decay with a power-law decay index of 0.996, the count rate at T+24 hours will be 0.010 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 4.4 x 10^-13 (6.9 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00673978.
This circular is an official product of the Swift-XRT team.
GCN Circular #19019
A. Kozlova, S. Golenetskii, R. Aptekar, D. Frederiks, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, report:
The long-duration GRB 160216A (Swift-BAT trigger #673978: Troja et al., GCN Circ. 19014) triggered Konus-Wind at T0=69030.129 s UT (19:10:30.129).
The burst light curve shows a double-peaked structure started at ~T0-0.3 s with a total duration (80-1400 keV) of ~3.6 s. The emission is seen up to ~4 MeV.
As observed by Konus-Wind, the burst had a fluence of 3.05(-0.35,+0.39)x10^-6 erg/cm2, and a 64-ms peak flux, measured from T0+2.864 s, of 2.62(-0.70,+0.71)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the burst (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 10 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.66 (-0.31,+0.36) and Ep = 140 (-18,+25) keV (chi2 = 91/87 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -3.0 (chi2 = 91/86 dof)
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB160216_T69030/
Another long-duration GRB 160216B was detected by Konus-Wind in the same trigger record at ~T0+150 s. This second burst was also detected by Fermi-GBM, trigger #477342778.The KW ecliptic latitude response for GRB 160216B is consistent with the GBM localization and inconsistent with the BAT localization of GRB 160216A.
All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
GCN Circular #19020
S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), E. Troja (NASA/GSFC/UMCP), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlinks, we report further analysis of BAT GRB 160216A (trigger #673978) (Troja, et al., GCN Circ. 19014). The BAT ground-calculated position is RA, Dec = 311.679, -71.550 deg, which is
```
   RA(J2000)  =  20h 46m 43.0s 
   Dec(J2000) = -71d 33' 01.0" 
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 48%.
The mask-weighted light curve shows a small peak starting at ~T-0.3 sec, then two large peaks at ~T+0.6 s and ~T+3.2 sec, and ending at ~T+20 sec. T90 (15-350 keV) is 11.0 +- 1.0 sec (estimated error including systematics).
The time-averaged spectrum from T-0.30 to T+11.70 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.48 +- 0.08. The fluence in the 15-150 keV band is 2.0 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.70 sec in the 15-150 keV band is 7.3 +- 0.5 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/673978/BA/

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Jochen Greiner, last update: 17-Feb-2016 [Disclaimer]