Gamma-ray Burst 160321A

(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 21 Mar 16 15:56:23 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     680017,   Seg_Num: 0
GRB_RA:           99.414d {+06h 37m 39s} (J2000),
                  99.631d {+06h 38m 31s} (current),
                  98.746d {+06h 34m 59s} (1950)
GRB_DEC:          +5.715d {+05d 42' 53"} (J2000),
                  +5.700d {+05d 41' 59"} (current),
                  +5.759d {+05d 45' 31"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       33932 [cnts]    Image_Peak=679 [image_cnts]
TRIGGER_DUR:     8.192 [sec] 
TRIGGER_INDEX:   453     E_range: 15-50 keV
BKG_INTEN:       241349 [cnts]
BKG_TIME:        57239.98 SOD {15:53:59.98} UT
BKG_DUR:         64 [sec]
GRB_DATE:        17468 TJD;    81 DOY;   16/03/21
GRB_TIME:        57327.22 SOD {15:55:27.22} UT
GRB_PHI:         -141.91 [deg]
GRB_THETA:        17.24 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.30 [sigma]
IMAGE_SIGNIF:    9.20 [sigma]
MERIT_PARAMS:     +1  +0  +0  +3  +1  +0  +0  +1 +13  +0 
SUN_POSTN:         1.35d {+00h 05m 23s}   +0.58d {+00d 35' 01"}
SUN_DIST:         98.18 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      162.24d {+10h 48m 58s}   +6.53d {+06d 32' 05"}
MOON_DIST:        62.22 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      206.28, -0.45 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       99.82,-17.40 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 50.20,16.58 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 21 Mar 16 15:57:25 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     680017,   Seg_Num: 0
POINT_RA:         99.422d {+06h 37m 41s} (J2000)
POINT_DEC:        +5.718d {+05d 43' 06"} (J2000)
IMG_START_DATE:  17468 TJD;    81 DOY;   16/03/21
IMG_START_TIME:  57438.09 SOD {15:57:18.09} UT,   110.9 [sec] since BAT Trigger Time
COUNTS:          21    Min_needed= 20
STD_DEV:         32.04   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        3    Max_iter_allowed= 4
ERROR_CODE:      3
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        Standard deviation too large.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 21 Mar 16 15:59:25 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     680017,   Seg_Num: 0
GRB_RA:           99.414d {+06h 37m 39s} (J2000),
                  99.631d {+06h 38m 31s} (current),
                  98.746d {+06h 34m 59s} (1950)
GRB_DEC:          +5.715d {+05d 42' 53"} (J2000),
                  +5.700d {+05d 41' 59"} (current),
                  +5.759d {+05d 45' 31"} (1950)
GRB_DATE:        17468 TJD;    81 DOY;   16/03/21
GRB_TIME:        57327.22 SOD {15:55:27.22} UT
TRIGGER_INDEX:   453
GRB_PHI:         -141.91 [deg]
GRB_THETA:        17.24 [deg]
DELTA_TIME:      77.00 [sec]
TRIGGER_DUR:     8.192 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.30 [sigma]
IMAGE_SIGNIF:    9.20 [sigma]
LC_URL:          sw00680017000msb.lc
SUN_POSTN:         1.35d {+00h 05m 24s}   +0.58d {+00d 35' 04"}
SUN_DIST:         98.18 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      162.27d {+10h 49m 04s}   +6.53d {+06d 31' 38"}
MOON_DIST:        62.24 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      206.28, -0.45 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       99.82,-17.40 [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 = 50.20,16.58 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 21 Mar 16 16:00:54 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     680017,   Seg_Num: 0
POINT_RA:         99.422d {+06h 37m 41s} (J2000)
POINT_DEC:        +5.719d {+05d 43' 07"} (J2000)
POINT_ROLL:      271.390d
IMG_START_DATE:  17468 TJD;    81 DOY;   16/03/21
IMG_START_TIME:  57442.11 SOD {15:57:22.11} UT,   114.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.244
N_STARS:         190
X_OFFSET:        518 [pixels]
Y_OFFSET:        485 [pixels]
X_MAX:           1477 [pixels]
Y_MAX:           1444 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    10
SL_URL:          sw00680017000msufc0114.fits
SUN_POSTN:         1.35d {+00h 05m 24s}   +0.58d {+00d 35' 05"}
SUN_DIST:         98.19 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      162.28d {+10h 49m 07s}   +6.52d {+06d 31' 25"}
MOON_DIST:        62.25 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      206.28, -0.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       99.83,-17.40 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 21 Mar 16 16:01:24 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     680017,   Seg_Num: 0
POINT_RA:         99.422d {+06h 37m 41s} (J2000)
POINT_DEC:        +5.719d {+05d 43' 07"} (J2000)
POINT_ROLL:      271.390d
IMG_START_DATE:  17468 TJD;    81 DOY;   16/03/21
IMG_START_TIME:  57442.11 SOD {15:57:22.11} UT,   114.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.244
N_STARS:         190
X_OFFSET:        518 [pixels]
Y_OFFSET:        485 [pixels]
X_MAX:           1477 [pixels]
Y_MAX:           1444 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    10
SL_URL:          sw00680017000msufc0114.fits
SUN_POSTN:         1.35d {+00h 05m 24s}   +0.58d {+00d 35' 06"}
SUN_DIST:         98.19 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      162.28d {+10h 49m 08s}   +6.52d {+06d 31' 20"}
MOON_DIST:        62.25 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      206.28, -0.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       99.83,-17.40 [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 21 Mar 16 16:01:28 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     680017,   Seg_Num: 0
GRB_RA:           99.4206d {+06h 37m 40.94s} (J2000),
                  99.6374d {+06h 38m 32.96s} (current),
                  98.7523d {+06h 35m 00.55s} (1950)
GRB_DEC:          +5.7481d {+05d 44' 53.1"} (J2000),
                  +5.7332d {+05d 43' 59.3"} (current),
                  +5.7921d {+05d 47' 31.4"} (1950)
GRB_ERROR:       3.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17468 TJD;    81 DOY;   16/03/21
IMG_START_TIME:  57456.00 SOD {15:57:36.00} UT,   128.8 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:         1.35d {+00h 05m 24s}   +0.58d {+00d 35' 06"}
SUN_DIST:         98.19 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      162.28d {+10h 49m 08s}   +6.52d {+06d 31' 20"}
MOON_DIST:        62.25 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      206.25, -0.43 [deg] galactic lon,lat of the burst
ECL_COORDS:       99.83,-17.37 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
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:     Mon 21 Mar 16 16:02:49 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     680017,   Seg_Num: 0
POINT_RA:         99.422d {+06h 37m 41s} (J2000)
POINT_DEC:        +5.719d {+05d 43' 07"} (J2000)
ROLL:            271.390d
IMG_START_DATE:  17468 TJD;    81 DOY;   16/03/21
IMG_START_TIME:  57442.11 SOD {15:57:22.11} UT,   114.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     480268658
X_OFFSET:        837 [pixels]
Y_OFFSET:        804 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       997
Y_GRB_POS:       964
BINNING_INDEX:   1
IM_URL:          sw00680017000msuni0131.fits
SUN_POSTN:         1.35d {+00h 05m 24s}   +0.59d {+00d 35' 07"}
SUN_DIST:         98.19 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      162.29d {+10h 49m 10s}   +6.52d {+06d 31' 08"}
MOON_DIST:        62.26 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      206.28, -0.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       99.83,-17.40 [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 21 Mar 16 16:03:05 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     680017,   Seg_Num: 0
POINT_RA:         99.422d {+06h 37m 41s} (J2000)
POINT_DEC:        +5.719d {+05d 43' 07"} (J2000)
ROLL:            271.390d
IMG_START_DATE:  17468 TJD;    81 DOY;   16/03/21
IMG_START_TIME:  57442.11 SOD {15:57:22.11} UT,   114.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     480268658
X_OFFSET:        837 [pixels]
Y_OFFSET:        804 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       997
Y_GRB_POS:       964
BINNING_INDEX:   1
IM_URL:          sw00680017000msuni0131.fits
SUN_POSTN:         1.35d {+00h 05m 24s}   +0.59d {+00d 35' 08"}
SUN_DIST:         98.19 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      162.30d {+10h 49m 11s}   +6.52d {+06d 31' 05"}
MOON_DIST:        62.26 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      206.28, -0.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       99.83,-17.40 [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:     Mon 21 Mar 16 16:07:50 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     680017,   Seg_Num: 0
POINT_RA:         99.424d {+06h 37m 42s} (J2000)
POINT_DEC:        +5.720d {+05d 43' 13"} (J2000)
POINT_ROLL:      271.393d
IMG_START_DATE:  17468 TJD;    81 DOY;   16/03/21
IMG_START_TIME:  57600.20 SOD {16:00:00.20} UT,   273.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.442
N_STARS:         190
X_OFFSET:        278 [pixels]
Y_OFFSET:        245 [pixels]
X_MAX:           1717 [pixels]
Y_MAX:           1684 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00680017000msufc0272.fits
SUN_POSTN:         1.35d {+00h 05m 25s}   +0.59d {+00d 35' 12"}
SUN_DIST:         98.19 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      162.33d {+10h 49m 20s}   +6.51d {+06d 30' 23"}
MOON_DIST:        62.30 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      206.28, -0.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       99.83,-17.40 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 21 Mar 16 16:08:12 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     680017,   Seg_Num: 0
POINT_RA:         99.424d {+06h 37m 42s} (J2000)
POINT_DEC:        +5.720d {+05d 43' 13"} (J2000)
POINT_ROLL:      271.393d
IMG_START_DATE:  17468 TJD;    81 DOY;   16/03/21
IMG_START_TIME:  57600.20 SOD {16:00:00.20} UT,   273.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.442
N_STARS:         190
X_OFFSET:        278 [pixels]
Y_OFFSET:        245 [pixels]
X_MAX:           1717 [pixels]
Y_MAX:           1684 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00680017000msufc0272.fits
SUN_POSTN:         1.35d {+00h 05m 25s}   +0.59d {+00d 35' 13"}
SUN_DIST:         98.19 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      162.34d {+10h 49m 21s}   +6.51d {+06d 30' 20"}
MOON_DIST:        62.30 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      206.28, -0.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       99.83,-17.40 [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 21 Mar 16 16:08:22 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     680017,   Seg_Num: 0
GRB_RA:           99.4192d {+06h 37m 40.60s} (J2000),
                  99.6360d {+06h 38m 32.63s} (current),
                  98.7509d {+06h 35m 00.21s} (1950)
GRB_DEC:          +5.7473d {+05d 44' 50.2"} (J2000),
                  +5.7324d {+05d 43' 56.4"} (current),
                  +5.7913d {+05d 47' 28.5"} (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:  17468 TJD;    81 DOY;   16/03/21
IMG_START_TIME:  57456.00 SOD {15:57:36.00} UT,   128.8 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:         1.35d {+00h 05m 25s}   +0.59d {+00d 35' 13"}
SUN_DIST:         98.18 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      162.34d {+10h 49m 21s}   +6.51d {+06d 30' 19"}
MOON_DIST:        62.31 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      206.25, -0.43 [deg] galactic lon,lat of the burst
ECL_COORDS:       99.82,-17.37 [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 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 21 Mar 16 16:09:18 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     680017,   Seg_Num: 0
POINT_RA:         99.424d {+06h 37m 42s} (J2000)
POINT_DEC:        +5.720d {+05d 43' 13"} (J2000)
ROLL:            271.393d
IMG_START_DATE:  17468 TJD;    81 DOY;   16/03/21
IMG_START_TIME:  57600.20 SOD {16:00:00.20} UT,   273.0 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     480268816
X_OFFSET:        837 [pixels]
Y_OFFSET:        804 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       997
Y_GRB_POS:       964
BINNING_INDEX:   1
IM_URL:          sw00680017000msuni0289.fits
SUN_POSTN:         1.35d {+00h 05m 25s}   +0.59d {+00d 35' 14"}
SUN_DIST:         98.19 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      162.35d {+10h 49m 23s}   +6.50d {+06d 30' 10"}
MOON_DIST:        62.31 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      206.28, -0.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       99.83,-17.40 [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 21 Mar 16 16:09:33 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     680017,   Seg_Num: 0
POINT_RA:         99.424d {+06h 37m 42s} (J2000)
POINT_DEC:        +5.720d {+05d 43' 13"} (J2000)
ROLL:            271.393d
IMG_START_DATE:  17468 TJD;    81 DOY;   16/03/21
IMG_START_TIME:  57600.20 SOD {16:00:00.20} UT,   273.0 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     480268816
X_OFFSET:        837 [pixels]
Y_OFFSET:        804 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       997
Y_GRB_POS:       964
BINNING_INDEX:   1
IM_URL:          sw00680017000msuni0289.fits
SUN_POSTN:         1.35d {+00h 05m 25s}   +0.59d {+00d 35' 14"}
SUN_DIST:         98.19 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      162.35d {+10h 49m 23s}   +6.50d {+06d 30' 08"}
MOON_DIST:        62.32 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      206.28, -0.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       99.83,-17.40 [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 #19211
M. Stamatikos (OSU/NASA/GSFC), S. D. Barthelmy (GSFC), A. A. Breeveld (UCL-MSSL), D. N. Burrows (PSU), S. B. Cenko (GSFC), P. D'Avanzo (INAF-OAB), P.A. Evans (U Leicester), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), N. P. M. Kuin (UCL-MSSL), L. M. McCauley (PSU), A. Melandri (INAF-OAB), B. Mingo (U Leicester), K. L. Page (U Leicester), T. G. R. Roegiers (PSU), T. Sakamoto (AGU), B. Sbarufatti (INAF-OAB/PSU) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 15:55:27 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 160321A (trigger=680017). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 99.414, +5.715, which is
```
   RA(J2000)  =  06h 37m 39s
   Dec(J2000) = +05d 42' 53"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a few weak peaks with a total duration of about 35 sec. The peak count rate was ~700 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began observing the field at 15:57:18.0 UT, 110.9 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 99.4192, 5.7474 which is equivalent to:
```
   RA(J2000)  = 06h 37m 40.60s
   Dec(J2000) = +05d 44' 50.8"
```
with an uncertainty of 2.3 arcseconds (radius, 90% containment). This location is 118 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 consistent with the Galactic value of 7.16 x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 114 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 none of the XRT error circle. 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 large, but uncertain extinction expected.
Due to the proximity of the source to the Galactic plane (lat = -0.43 degrees) we cannot determine whether this is a Galactic source or a GRB, based on the immediately available data.
Burst Advocate for this burst is M. Stamatikos (Michael.Stamatikos-1 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:     Mon 21 Mar 16 16:13:14 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     680017,   Seg_Num: 0
POINT_RA:         99.424d {+06h 37m 42s} (J2000)
POINT_DEC:        +5.720d {+05d 43' 12"} (J2000)
POINT_ROLL:      271.392d
IMG_START_DATE:  17468 TJD;    81 DOY;   16/03/21
IMG_START_TIME:  58204.22 SOD {16:10:04.22} UT,   877.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.966
N_STARS:         190
X_OFFSET:        278 [pixels]
Y_OFFSET:        245 [pixels]
X_MAX:           1717 [pixels]
Y_MAX:           1684 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    9
SL_URL:          sw00680017000msufc0877.fits
SUN_POSTN:         1.36d {+00h 05m 26s}   +0.59d {+00d 35' 18"}
SUN_DIST:         98.18 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      162.38d {+10h 49m 31s}   +6.49d {+06d 29' 35"}
MOON_DIST:        62.35 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      206.28, -0.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       99.83,-17.40 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 21 Mar 16 16:13:27 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     680017,   Seg_Num: 0
POINT_RA:         99.424d {+06h 37m 42s} (J2000)
POINT_DEC:        +5.720d {+05d 43' 12"} (J2000)
POINT_ROLL:      271.392d
IMG_START_DATE:  17468 TJD;    81 DOY;   16/03/21
IMG_START_TIME:  58204.22 SOD {16:10:04.22} UT,   877.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.966
N_STARS:         190
X_OFFSET:        278 [pixels]
Y_OFFSET:        245 [pixels]
X_MAX:           1717 [pixels]
Y_MAX:           1684 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    9
SL_URL:          sw00680017000msufc0877.fits
SUN_POSTN:         1.36d {+00h 05m 26s}   +0.59d {+00d 35' 18"}
SUN_DIST:         98.18 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      162.38d {+10h 49m 31s}   +6.49d {+06d 29' 33"}
MOON_DIST:        62.35 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      206.28, -0.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       99.83,-17.40 [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 21 Mar 16 16:15:02 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     680017,   Seg_Num: 0
POINT_RA:         99.424d {+06h 37m 42s} (J2000)
POINT_DEC:        +5.720d {+05d 43' 12"} (J2000)
ROLL:            271.392d
IMG_START_DATE:  17468 TJD;    81 DOY;   16/03/21
IMG_START_TIME:  58204.22 SOD {16:10:04.22} UT,   877.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     480269420
X_OFFSET:        837 [pixels]
Y_OFFSET:        804 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       997
Y_GRB_POS:       964
BINNING_INDEX:   1
IM_URL:          sw00680017000msuni0894.fits
SUN_POSTN:         1.36d {+00h 05m 26s}   +0.59d {+00d 35' 19"}
SUN_DIST:         98.18 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      162.39d {+10h 49m 34s}   +6.49d {+06d 29' 19"}
MOON_DIST:        62.36 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      206.28, -0.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       99.83,-17.40 [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 21 Mar 16 16:15:19 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     680017,   Seg_Num: 0
POINT_RA:         99.424d {+06h 37m 42s} (J2000)
POINT_DEC:        +5.720d {+05d 43' 12"} (J2000)
ROLL:            271.392d
IMG_START_DATE:  17468 TJD;    81 DOY;   16/03/21
IMG_START_TIME:  58204.22 SOD {16:10:04.22} UT,   877.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     480269420
X_OFFSET:        837 [pixels]
Y_OFFSET:        804 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       997
Y_GRB_POS:       964
BINNING_INDEX:   1
IM_URL:          sw00680017000msuni0894.fits
SUN_POSTN:         1.36d {+00h 05m 26s}   +0.59d {+00d 35' 20"}
SUN_DIST:         98.18 [deg]   Sun_angle= -6.6 [hr] (East of Sun)
MOON_POSTN:      162.39d {+10h 49m 35s}   +6.49d {+06d 29' 17"}
MOON_DIST:        62.36 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      206.28, -0.44 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       99.83,-17.40 [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 #19212
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk
E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.V.Chazov Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Senik Kislovodsk Solar Station of the Pulkovo Observatory
K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University
V.Krushinski, I.Zalozhnih, A. Popov Ural Federal University, Kourovka
D.Buckley, S. Potter, A.Kniazev, M.Kotze South African Astronomical Observatory
Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA)
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Kislovodsk was pointed to the GRB160321A 6 sec after notice time and 68 sec after trigger time at 2016-03-21 15:56:35 UT. We do not found optical transient within SWIFT error-box (Stamatikos et al., GCN 60321A) brighter then 13.1. After Sunset we found:
```
Pro.type	Date time 	     Exp.time	Limit	Filt.	Tube.
Alert 	      2016-03-21 16:43:44	180	18.6	W	WEST
Alert 	      2016-03-21 16:43:44	180	18.1	W	EAST
Alert 	      2016-03-21 16:40:18	180	18.6	W	WEST
Alert 	      2016-03-21 16:36:45	180	18.6	W	WEST
Alert 	      2016-03-21 16:36:45	180	18.1	W	EAST
Alert 	      2016-03-21 16:33:16	180	18.5	W	WEST
Alert 	      2016-03-21 16:28:25	180	17.6	P	WEST
Alert 	      2016-03-21 16:28:25	180	17.6	P	EAST
Alert 	      2016-03-21 16:21:39	180	17.4	P	EAST
```
The galaxy latitude is about zero. So this is the optical free GRB.
The message may be cited.
GCN Circular #19213
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 1066 s of XRT Photon Counting mode data and 2 UVOT images for GRB 160321A, 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 = 99.41970, +5.74771 which is equivalent to:
```
RA (J2000): 06h 37m 40.73s
Dec (J2000): +05d 44' 51.8"
```
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 #19215
A. Maselli (INAF-IASFPA), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), T.G.R. Roegiers (PSU), C. Pagani (U. Leicester), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester) and M. Stamatikos report on behalf of the Swift-XRT team:
We have analysed 8.9 ks of XRT data for GRB 160321A (Stamatikos et al. GCN Circ. 19211), from 96 s to 58.6 ks after the BAT trigger. The data comprise 31 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. 19213).
The light curve can be modelled with a power-law decay with a decay index of alpha=2.36 (+0.13, -0.11).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.45 (+0.33, -0.30). The best-fitting absorption column is 9.3 (+3.8, -2.1) x 10^21 cm^-2, consistent with the Galactic value of 7.2 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 6.5 x 10^-11 (8.8 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     9.3 (+3.8, -2.1) x 10^21 cm^-2
Galactic foreground: 7.2 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.45 (+0.33, -0.30)
```
If the light curve continues to decay with a power-law decay index of 2.36, the count rate at T+24 hours will be 1.2 x 10^-6 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 8.0 x 10^-17 (1.1 x 10^-16) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00680017.
This circular is an official product of the Swift-XRT team.
GCN Circular #19216
H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), 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-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 160321A (trigger #680017) (Stamatikos, et al., GCN Circ. 19211). The BAT ground-calculated position is RA, Dec = 99.420, 5.753 deg which is
```
     RA(J2000)  =  06h 37m 40.7s
     Dec(J2000) = +05d 45' 09.3"
```
with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 96%.
The mask-weighted light curve shows a single-pulse structure that starts at ~ T0-22 sec, peaks at ~ T+2 sec, and ends at ~ T+23 sec. T90 (15-350 keV) is 33.6 +- 4.8 sec (estimated error including systematics).
The time-averaged spectrum from T-20.9 to T+19.0 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.89 +- 0.19. The fluence in the 15-150 keV band is 5.3 +- 0.7 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+2.17 sec in the 15-150 keV band is 0.5 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
Based on the ground analysis result, this event is very likely a GRB. However, given that it is on the Galactic Plane (lat = -0.43 deg.), we cannot rule out a galactic origin. We note that the BAT time averaged spectrum is soft but still in the typical range for BAT GRBs.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/680017/BA/
GCN Circular #19217
S.W.K. Emery (UCL-MSSL) and M. Stamatikos (OSU/NASA/GSFC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 160321A 115 s after the BAT trigger (Stamatikos et al., GCN Circ. 19211). No optical afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 19213) 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           115          265          147         >20.4
u_FC               273          523          246         >19.7
white              115         6458          546         >21.1
v                  603         6870          452         >19.5
b                  529         6253          255         >20.1
u                  273        12683          570         >20.1
w1                 652        12607         1141         >20.2
m2                 627        11700         1205         >20.1
w2                 579         6664          452         >19.7
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.75 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #19218
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 (GSFC/STScI), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jos=E9 A. de Diego (UNAM), Leonid Georgiev (UNAM), 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 GRB 160321A (Stamatikos, et al., GCN 19211) 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 2016/03 22.14 to 2016/03 22.29 UTC (11.32 to 15.08 hours after the BAT trigger), obtaining a total of 2.47 hours exposure in the r and i bands and 0.82 hours exposure in the Z, Y, J, and H bands.
For a source within the Swift-XRT error circle (Beardmore, et al., GCN 19213), in comparison with the USNO-B1 and 2MASS catalogs, we obtain the following weak detections and upper limits (3-sigma):
```
 r > 23.84
 i =3D 22.32 +/- 0.11
 Z =3D 22.49 +/- 0.34
 Y > 22.19
 J > 21.53
 H > 21.27
```
These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. Further analysis is ongoing.
We thank the staff of the Observatorio Astron=F3mico Nacional in San Pedro M=E1rtir.
GCN Circular #19219
E. Mazaeva (IKI), A. Volnova (IKI), R. Inasaridze (AbAO), V. Ayvazian (AbAO), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of Swift GRB 160321A (Stamatikos et al., GCN 19211) with AS-32 (0.7m) telescope of Abastumani Observatory starting on Mar. 21 (UT) 16:26:45. We obtained several unfiltered images of the field. We do not detect any source within enhanced XRT error circle (Beardmore et al., GCN 19213) down to 21.9m. A probable source (S/N = 2) detected 3.5 arcsec South from the center of XRT error circle (Beardmore et al., GCN 19213) in coordinates (J2000) 06:37:40.74 +05:44:48.2 +/- 0.5 arcsec in both coordinates.
Preliminary photometry of the field is following
```
Date       UT start   t-T0     Filter  Exp.    UL (3 sigma)
                      (mid, days)       (s)

2016-03-21 16:26:45   0.06839  none    41*120  21.9
```
Photometry is based on nearby USNO-B1.0 stars
```
USNO-B1_id   R2
0956-0104166 16.23
0957-0105913 15.38
0957-0106394 14.58
0956-0104566 15.41
```
GCN Circular #19452
K. P. Mooley, T. D. Staley, R. P. Fender (Oxford), G. E. Anderson (Curtin), C. Rumsey, D. Titterington, S. Carey, J. Hickish, Y. C. Perrott, N. Razavi-Ghods, P. Scott (Cambridge), K. Grainge, A. Scaife (Manchester)
The AMI Large Array robotically triggered on the Swift alert for GRB 160321A (Stamatikos et al., GCN 19211) as part of the 4pisky program, and subsequent follow up observations were obtained up to 10 days post-burst. Our observations at 15 GHz on 2016 Mar 21.70, Mar 22.85, Mar 24.74, Mar 29.66, and Mar 31.68 (UT) do not reveal any radio source at the XRT location (Beardmore et al., GCN 19213), with 3sigma upper limits of 195 uJy, 261 uJy, 162 uJy, 207 uJy, and 189 uJy respectively.
We thank the AMI staff for scheduling these observations. The AMI-GRB database is a log of all GRB follow up observations with the AMI, and is available at http://4pisky.org/ami-grb/.

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Jochen Greiner, last update: 24-May-2016 [Disclaimer]