Gamma-ray Burst 100316B

(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 Mar 10 08:01:52 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     416103,   Seg_Num: 0
GRB_RA:          163.498d {+10h 54m 00s} (J2000),
                 163.612d {+10h 54m 27s} (current),
                 162.939d {+10h 51m 45s} (1950)
GRB_DEC:         -45.480d {-45d 28' 47"} (J2000),
                 -45.534d {-45d 32' 03"} (current),
                 -45.213d {-45d 12' 47"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       3097 [cnts]    Image_Peak=189 [image_cnts]
TRIGGER_DUR:     0.512 [sec] 
TRIGGER_INDEX:   121     E_range: 15-50 keV
BKG_INTEN:       36362 [cnts]
BKG_TIME:        28882.38 SOD {08:01:22.38} UT
BKG_DUR:         8 [sec]
GRB_DATE:        15271 TJD;    75 DOY;   10/03/16
GRB_TIME:        28896.97 SOD {08:01:36.97} UT
GRB_PHI:          83.15 [deg]
GRB_THETA:        14.40 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     15.42 [sigma]
IMAGE_SIGNIF:    9.10 [sigma]
MERIT_PARAMS:     +1  +0  +0  -1  +1  +0  +0  +0 +66  +0 
SUN_POSTN:       355.98d {+23h 43m 56s}   -1.74d {-01d 44' 19"}
SUN_DIST:        131.47 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      358.83d {+23h 55m 20s}   +4.69d {+04d 41' 19"}
MOON_DIST:       137.05 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      282.30, 12.64 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      188.53,-47.17 [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 = 209.54,4.82 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Mar 10 08:02:56 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     416103,   Seg_Num: 0
POINT_RA:        163.486d {+10h 53m 57s} (J2000)
POINT_DEC:       -45.490d {-45d 29' 22"} (J2000)
IMG_START_DATE:  15271 TJD;    75 DOY;   10/03/16
IMG_START_TIME:  28961.09 SOD {08:02:41.09} UT,   64.1 [sec] since BAT Trigger Time
COUNTS:          12    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        3    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:     Tue 16 Mar 10 08:05:48 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     416103,   Seg_Num: 0
GRB_RA:          163.498d {+10h 54m 00s} (J2000),
                 163.612d {+10h 54m 27s} (current),
                 162.939d {+10h 51m 45s} (1950)
GRB_DEC:         -45.480d {-45d 28' 47"} (J2000),
                 -45.534d {-45d 32' 03"} (current),
                 -45.213d {-45d 12' 47"} (1950)
GRB_DATE:        15271 TJD;    75 DOY;   10/03/16
GRB_TIME:        28896.97 SOD {08:01:36.97} UT
TRIGGER_INDEX:   121
GRB_PHI:          83.15 [deg]
GRB_THETA:        14.40 [deg]
DELTA_TIME:      -18.00 [sec]
TRIGGER_DUR:     0.512 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     15.42 [sigma]
IMAGE_SIGNIF:    9.10 [sigma]
LC_URL:          sw00416103000msb.lc
SUN_POSTN:       355.99d {+23h 43m 57s}   -1.74d {-01d 44' 15"}
SUN_DIST:        131.47 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      358.86d {+23h 55m 27s}   +4.70d {+04d 42' 10"}
MOON_DIST:       137.06 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      282.30, 12.64 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      188.53,-47.17 [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 = 209.54,4.82 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Mar 10 08:06:22 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     416103,   Seg_Num: 0
POINT_RA:        163.486d {+10h 53m 57s} (J2000)
POINT_DEC:       -45.490d {-45d 29' 22"} (J2000)
POINT_ROLL:      196.771d
IMG_START_DATE:  15271 TJD;    75 DOY;   10/03/16
IMG_START_TIME:  28963.62 SOD {08:02:43.62} UT,   66.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.976
N_STARS:         190
X_OFFSET:        368 [pixels]
Y_OFFSET:        575 [pixels]
X_MAX:           1327 [pixels]
Y_MAX:           1534 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00416103000msufc0066.fits
SUN_POSTN:       355.99d {+23h 43m 57s}   -1.74d {-01d 44' 14"}
SUN_DIST:        131.46 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      358.87d {+23h 55m 28s}   +4.70d {+04d 42' 17"}
MOON_DIST:       137.05 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      282.30, 12.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      188.53,-47.18 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Mar 10 08:07:21 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     416103,   Seg_Num: 0
POINT_RA:        163.486d {+10h 53m 57s} (J2000)
POINT_DEC:       -45.490d {-45d 29' 22"} (J2000)
POINT_ROLL:      196.771d
IMG_START_DATE:  15271 TJD;    75 DOY;   10/03/16
IMG_START_TIME:  28963.62 SOD {08:02:43.62} UT,   66.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.976
N_STARS:         190
X_OFFSET:        368 [pixels]
Y_OFFSET:        575 [pixels]
X_MAX:           1327 [pixels]
Y_MAX:           1534 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00416103000msufc0066.fits
SUN_POSTN:       355.99d {+23h 43m 57s}   -1.74d {-01d 44' 13"}
SUN_DIST:        131.46 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      358.88d {+23h 55m 30s}   +4.71d {+04d 42' 30"}
MOON_DIST:       137.05 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      282.30, 12.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      188.53,-47.18 [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 Mar 10 08:08:00 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     416103,   Seg_Num: 0
POINT_RA:        163.486d {+10h 53m 57s} (J2000)
POINT_DEC:       -45.490d {-45d 29' 22"} (J2000)
ROLL:            196.771d
IMG_START_DATE:  15271 TJD;    75 DOY;   10/03/16
IMG_START_TIME:  28963.62 SOD {08:02:43.62} UT,   66.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     290419369
X_OFFSET:        687 [pixels]
Y_OFFSET:        894 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       847
Y_GRB_POS:       1054
BINNING_INDEX:   1
IM_URL:          sw00416103000msuni0072.fits
SUN_POSTN:       355.99d {+23h 43m 57s}   -1.74d {-01d 44' 13"}
SUN_DIST:        131.46 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      358.88d {+23h 55m 31s}   +4.71d {+04d 42' 39"}
MOON_DIST:       137.05 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      282.30, 12.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      188.53,-47.18 [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:     Tue 16 Mar 10 08:08:25 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     416103,   Seg_Num: 0
POINT_RA:        163.486d {+10h 53m 57s} (J2000)
POINT_DEC:       -45.490d {-45d 29' 22"} (J2000)
ROLL:            196.771d
IMG_START_DATE:  15271 TJD;    75 DOY;   10/03/16
IMG_START_TIME:  28963.62 SOD {08:02:43.62} UT,   66.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     290419369
X_OFFSET:        687 [pixels]
Y_OFFSET:        894 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       847
Y_GRB_POS:       1054
BINNING_INDEX:   1
IM_URL:          sw00416103000msuni0072.fits
SUN_POSTN:       355.99d {+23h 43m 57s}   -1.74d {-01d 44' 12"}
SUN_DIST:        131.46 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      358.88d {+23h 55m 32s}   +4.71d {+04d 42' 44"}
MOON_DIST:       137.05 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      282.30, 12.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      188.53,-47.18 [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:     Tue 16 Mar 10 08:09:21 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     416103,   Seg_Num: 0
GRB_RA:          163.4884d {+10h 53m 57.21s} (J2000),
                 163.6028d {+10h 54m 24.66s} (current),
                 162.9293d {+10h 51m 43.02s} (1950)
GRB_DEC:         -45.4722d {-45d 28' 19.9"} (J2000),
                 -45.5267d {-45d 31' 36.0"} (current),
                 -45.2057d {-45d 12' 20.3"} (1950)
GRB_ERROR:       4.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15271 TJD;    75 DOY;   10/03/16
IMG_START_TIME:  28976.00 SOD {08:02:56.00} UT,   79.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       355.99d {+23h 43m 57s}   -1.74d {-01d 44' 11"}
SUN_DIST:        131.48 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      358.89d {+23h 55m 34s}   +4.72d {+04d 42' 56"}
MOON_DIST:       137.07 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      282.29, 12.64 [deg] galactic lon,lat of the burst
ECL_COORDS:      188.52,-47.17 [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:     Tue 16 Mar 10 08:06:22 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     416103,   Seg_Num: 0
POINT_RA:        163.486d {+10h 53m 57s} (J2000)
POINT_DEC:       -45.490d {-45d 29' 22"} (J2000)
POINT_ROLL:      196.771d
IMG_START_DATE:  15271 TJD;    75 DOY;   10/03/16
IMG_START_TIME:  28963.62 SOD {08:02:43.62} UT,   66.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.976
N_STARS:         190
X_OFFSET:        368 [pixels]
Y_OFFSET:        575 [pixels]
X_MAX:           1327 [pixels]
Y_MAX:           1534 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00416103000msufc0066.fits
SUN_POSTN:       355.99d {+23h 43m 57s}   -1.74d {-01d 44' 14"}
SUN_DIST:        131.46 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      358.87d {+23h 55m 28s}   +4.70d {+04d 42' 17"}
MOON_DIST:       137.05 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      282.30, 12.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      188.53,-47.18 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Mar 10 08:13:13 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     416103,   Seg_Num: 0
GRB_RA:          163.4881d {+10h 53m 57.14s} (J2000),
                 163.6025d {+10h 54m 24.59s} (current),
                 162.9290d {+10h 51m 42.95s} (1950)
GRB_DEC:         -45.4727d {-45d 28' 21.7"} (J2000),
                 -45.5272d {-45d 31' 37.8"} (current),
                 -45.2062d {-45d 12' 22.1"} (1950)
GRB_ERROR:       0.6 [arcsec radius, statistical only]
GRB_MAG:         18.36 +/- 0.14 [mag]
FILTER:          10, White
IMG_START_DATE:  15271 TJD;    75 DOY;   10/03/16
IMG_START_TIME:  28967.00 SOD {08:02:47.00} UT,   70.0 [sec] since BAT Trigger Time
SUN_POSTN:       355.99d {+23h 43m 58s}   -1.74d {-01d 44' 07"}
SUN_DIST:        131.48 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      358.92d {+23h 55m 41s}   +4.73d {+04d 43' 47"}
MOON_DIST:       137.07 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      282.29, 12.64 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      188.52,-47.17 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Mar 10 08:14:38 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     416103,   Seg_Num: 0
POINT_RA:        163.486d {+10h 53m 57s} (J2000)
POINT_DEC:       -45.492d {-45d 29' 32"} (J2000)
POINT_ROLL:      196.769d
IMG_START_DATE:  15271 TJD;    75 DOY;   10/03/16
IMG_START_TIME:  29175.50 SOD {08:06:15.50} UT,   278.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.631
N_STARS:         190
X_OFFSET:        128 [pixels]
Y_OFFSET:        335 [pixels]
X_MAX:           1567 [pixels]
Y_MAX:           1774 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00416103000msufc0278.fits
SUN_POSTN:       355.99d {+23h 43m 58s}   -1.74d {-01d 44' 06"}
SUN_DIST:        131.46 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      358.93d {+23h 55m 43s}   +4.73d {+04d 44' 05"}
MOON_DIST:       137.06 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      282.30, 12.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      188.53,-47.19 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Mar 10 08:15:20 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     416103,   Seg_Num: 0
POINT_RA:        163.486d {+10h 53m 57s} (J2000)
POINT_DEC:       -45.492d {-45d 29' 32"} (J2000)
POINT_ROLL:      196.769d
IMG_START_DATE:  15271 TJD;    75 DOY;   10/03/16
IMG_START_TIME:  29175.50 SOD {08:06:15.50} UT,   278.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.631
N_STARS:         190
X_OFFSET:        128 [pixels]
Y_OFFSET:        335 [pixels]
X_MAX:           1567 [pixels]
Y_MAX:           1774 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00416103000msufc0278.fits
SUN_POSTN:       355.99d {+23h 43m 58s}   -1.74d {-01d 44' 05"}
SUN_DIST:        131.46 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      358.94d {+23h 55m 45s}   +4.74d {+04d 44' 14"}
MOON_DIST:       137.06 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      282.30, 12.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      188.53,-47.19 [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 Mar 10 08:15:41 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     416103,   Seg_Num: 0
POINT_RA:        163.486d {+10h 53m 57s} (J2000)
POINT_DEC:       -45.492d {-45d 29' 32"} (J2000)
ROLL:            196.769d
IMG_START_DATE:  15271 TJD;    75 DOY;   10/03/16
IMG_START_TIME:  29175.50 SOD {08:06:15.50} UT,   278.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     290419581
X_OFFSET:        687 [pixels]
Y_OFFSET:        894 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       847
Y_GRB_POS:       1054
BINNING_INDEX:   1
IM_URL:          sw00416103000msuni0284.fits
SUN_POSTN:       355.99d {+23h 43m 58s}   -1.74d {-01d 44' 05"}
SUN_DIST:        131.46 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      358.94d {+23h 55m 45s}   +4.74d {+04d 44' 19"}
MOON_DIST:       137.06 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      282.30, 12.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      188.53,-47.19 [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:     Tue 16 Mar 10 08:14:38 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     416103,   Seg_Num: 0
POINT_RA:        163.486d {+10h 53m 57s} (J2000)
POINT_DEC:       -45.492d {-45d 29' 32"} (J2000)
POINT_ROLL:      196.769d
IMG_START_DATE:  15271 TJD;    75 DOY;   10/03/16
IMG_START_TIME:  29175.50 SOD {08:06:15.50} UT,   278.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.631
N_STARS:         190
X_OFFSET:        128 [pixels]
Y_OFFSET:        335 [pixels]
X_MAX:           1567 [pixels]
Y_MAX:           1774 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00416103000msufc0278.fits
SUN_POSTN:       355.99d {+23h 43m 58s}   -1.74d {-01d 44' 06"}
SUN_DIST:        131.46 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      358.93d {+23h 55m 43s}   +4.73d {+04d 44' 05"}
MOON_DIST:       137.06 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      282.30, 12.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      188.53,-47.19 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Mar 10 08:16:04 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     416103,   Seg_Num: 0
POINT_RA:        163.486d {+10h 53m 57s} (J2000)
POINT_DEC:       -45.492d {-45d 29' 32"} (J2000)
ROLL:            196.769d
IMG_START_DATE:  15271 TJD;    75 DOY;   10/03/16
IMG_START_TIME:  29175.50 SOD {08:06:15.50} UT,   278.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     290419581
X_OFFSET:        687 [pixels]
Y_OFFSET:        894 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       847
Y_GRB_POS:       1054
BINNING_INDEX:   1
IM_URL:          sw00416103000msuni0284.fits
SUN_POSTN:       355.99d {+23h 43m 58s}   -1.73d {-01d 44' 05"}
SUN_DIST:        131.46 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      358.94d {+23h 55m 46s}   +4.74d {+04d 44' 24"}
MOON_DIST:       137.06 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      282.30, 12.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      188.53,-47.19 [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:     Tue 16 Mar 10 08:16:07 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     416103,   Seg_Num: 0
GRB_RA:          163.4891d {+10h 53m 57.38s} (J2000),
                 163.6035d {+10h 54m 24.83s} (current),
                 162.9300d {+10h 51m 43.19s} (1950)
GRB_DEC:         -45.4727d {-45d 28' 21.7"} (J2000),
                 -45.5272d {-45d 31' 37.8"} (current),
                 -45.2062d {-45d 12' 22.1"} (1950)
GRB_ERROR:       2.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15271 TJD;    75 DOY;   10/03/16
IMG_START_TIME:  28976.00 SOD {08:02:56.00} UT,   79.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       355.99d {+23h 43m 58s}   -1.73d {-01d 44' 05"}
SUN_DIST:        131.48 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      358.94d {+23h 55m 46s}   +4.74d {+04d 44' 24"}
MOON_DIST:       137.08 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      282.29, 12.64 [deg] galactic lon,lat of the burst
ECL_COORDS:      188.52,-47.17 [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 Circular #10489
W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), S. Campana (INAF-OAB), P. A. Evans (U Leicester), J. M. Gelbord (PSU), C. Guidorzi (U Ferrara), S. T. Holland (CRESST/USRA/GSFC), O. M. Littlejohns (U Leicester), V. Mangano (INAF-IASFPA), C. B. Markwardt (CRESST/GSFC/UMD), P. T. O'Brien (U Leicester), C. Pagani (U Leicester), K. L. Page (U Leicester), P. Romano (INAF-IASFPA), A. Rowlinson (U Leicester), M. H. Siegel (PSU), R. L. C. Starling (U Leicester), G. Tagliaferri (INAF-OAB) and L. Vetere (PSU) report on behalf of the Swift Team:
At 08:01:36 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 100316B trigger=416103). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 163.498, -45.480 which is
```
   RA(J2000) = 10h 54m 00s
   Dec(J2000) = -45d 28' 47"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 5 sec. The peak count rate was ~2500 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began observing the field at 08:02:41.1 UT, 64.1 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source located at RA, Dec 163.48846, -45.47220 which is equivalent to:
```
   RA(J2000)  = 10h 53m 57.23s
   Dec(J2000) = -45d 28' 19.9"
```
with an uncertainty of 4.1 arcseconds (radius, 90% containment). This location is 36 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 9.92e+20 cm-2 (Kalberla et al. 2005).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 66 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	10:53:57.15 = 163.48812
  DEC(J2000) = -45:28:21.6  = -45.47267
```
with a 90%-confidence error radius of about 0.62 arc sec. This position is 2.1 arc sec. from the center of the XRT error circle. The estimated magnitude is 18.36 with a 1-sigma error of about 0.15. No correction has been made for the expected extinction corresponding to E(B-V) of 0.14.
Burst Advocate for this burst is W. H. Baumgartner (wayne AT milkyway.gsfc.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 Mar 10 08:22:46 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     416103,   Seg_Num: 0
POINT_RA:        163.486d {+10h 53m 57s} (J2000)
POINT_DEC:       -45.492d {-45d 29' 31"} (J2000)
POINT_ROLL:      196.769d
IMG_START_DATE:  15271 TJD;    75 DOY;   10/03/16
IMG_START_TIME:  29753.93 SOD {08:15:53.93} UT,   857.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.161
N_STARS:         190
X_OFFSET:        128 [pixels]
Y_OFFSET:        335 [pixels]
X_MAX:           1567 [pixels]
Y_MAX:           1774 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00416103000msufc0856.fits
SUN_POSTN:       356.00d {+23h 43m 59s}   -1.73d {-01d 43' 58"}
SUN_DIST:        131.46 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      358.99d {+23h 55m 59s}   +4.76d {+04d 45' 51"}
MOON_DIST:       137.07 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      282.30, 12.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      188.53,-47.19 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Mar 10 08:22:46 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     416103,   Seg_Num: 0
POINT_RA:        163.486d {+10h 53m 57s} (J2000)
POINT_DEC:       -45.492d {-45d 29' 31"} (J2000)
POINT_ROLL:      196.769d
IMG_START_DATE:  15271 TJD;    75 DOY;   10/03/16
IMG_START_TIME:  29753.93 SOD {08:15:53.93} UT,   857.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.161
N_STARS:         190
X_OFFSET:        128 [pixels]
Y_OFFSET:        335 [pixels]
X_MAX:           1567 [pixels]
Y_MAX:           1774 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00416103000msufc0856.fits
SUN_POSTN:       356.00d {+23h 43m 59s}   -1.73d {-01d 43' 58"}
SUN_DIST:        131.46 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      358.99d {+23h 55m 59s}   +4.76d {+04d 45' 51"}
MOON_DIST:       137.07 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      282.30, 12.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      188.53,-47.19 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 16 Mar 10 08:23:26 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     416103,   Seg_Num: 0
POINT_RA:        163.486d {+10h 53m 57s} (J2000)
POINT_DEC:       -45.492d {-45d 29' 31"} (J2000)
POINT_ROLL:      196.769d
IMG_START_DATE:  15271 TJD;    75 DOY;   10/03/16
IMG_START_TIME:  29753.93 SOD {08:15:53.93} UT,   857.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.161
N_STARS:         190
X_OFFSET:        128 [pixels]
Y_OFFSET:        335 [pixels]
X_MAX:           1567 [pixels]
Y_MAX:           1774 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00416103000msufc0856.fits
SUN_POSTN:       356.00d {+23h 43m 59s}   -1.73d {-01d 43' 57"}
SUN_DIST:        131.46 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      359.00d {+23h 56m 00s}   +4.77d {+04d 45' 59"}
MOON_DIST:       137.07 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      282.30, 12.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      188.53,-47.19 [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 Mar 10 08:24:22 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     416103,   Seg_Num: 0
POINT_RA:        163.486d {+10h 53m 57s} (J2000)
POINT_DEC:       -45.492d {-45d 29' 31"} (J2000)
ROLL:            196.769d
IMG_START_DATE:  15271 TJD;    75 DOY;   10/03/16
IMG_START_TIME:  29753.93 SOD {08:15:53.93} UT,   857.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     290420159
X_OFFSET:        687 [pixels]
Y_OFFSET:        894 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       847
Y_GRB_POS:       1054
BINNING_INDEX:   1
IM_URL:          sw00416103000msuni0862.fits
SUN_POSTN:       356.00d {+23h 44m 00s}   -1.73d {-01d 43' 56"}
SUN_DIST:        131.46 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      359.01d {+23h 56m 01s}   +4.77d {+04d 46' 11"}
MOON_DIST:       137.07 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      282.30, 12.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      188.53,-47.19 [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:     Tue 16 Mar 10 08:24:47 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     416103,   Seg_Num: 0
POINT_RA:        163.486d {+10h 53m 57s} (J2000)
POINT_DEC:       -45.492d {-45d 29' 31"} (J2000)
ROLL:            196.769d
IMG_START_DATE:  15271 TJD;    75 DOY;   10/03/16
IMG_START_TIME:  29753.93 SOD {08:15:53.93} UT,   857.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     290420159
X_OFFSET:        687 [pixels]
Y_OFFSET:        894 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       847
Y_GRB_POS:       1054
BINNING_INDEX:   1
IM_URL:          sw00416103000msuni0862.fits
SUN_POSTN:       356.00d {+23h 44m 00s}   -1.73d {-01d 43' 56"}
SUN_DIST:        131.46 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      359.01d {+23h 56m 02s}   +4.77d {+04d 46' 17"}
MOON_DIST:       137.07 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      282.30, 12.62 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      188.53,-47.19 [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 #10493
P. Afonso, R. Filgas and J.Greiner (all MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 100316B (Swift trigger #416103; Baumgartner et al., GCN #10489) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m ESO/MPI telescope at La Silla Observatory (Chile).
Observations started at 08:17 UT on 16 March 2010, 16 minutes after the GRB trigger, and are continuing.
We detect a single point source within the UVOT error circle reported by Baumgartner et al.
Based on the first 4 min of total exposures in g'r', we estimate preliminary magnitudes (all in AB system) of
g' = 19.2 +- 0.1 mag,
r' = 18.9 +- 0.1 mag,
indicating reshift < 3.5.
Given magnitudes are calibrated against GROND zeropoints and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.14 mag in the direction of the burst (Schlegel et al. 1998).
GCN Circular #10494
J. Haislip, K. Ivarsen, D. Reichart, A. LaCluyze, R. Egger, A. Foster, J. Moore, A. Oza, M. Schubel, J. Styblova, A. Trotter, J. A. Crain, and M. Nysewander report:
Skynet observed the Swift/BAT localization of GRB 100316B (Baumgartner et al., GCN 10489) with four of the 16" PROMPT telescopes at CTIO beginning 32 seconds after the trigger (19 seconds after notification) in BVRI.
We detect the afterglow (Baumgartner et al., GCN 10489) in all filters.
At 34 seconds after the trigger, the afterglow's magnitude was I = 15.61 +0.16 -0.14 (statistical) +/- 0.20 (systematic; calibrated to 56 USNO B1 stars).
Between 34 seconds and 2.1 minutes after the trigger, the afterglow faded with a power-law index of about -1.0.
Between 2.1 and 35 minutes after the trigger, the afterglow faded more slowly, with a power-law index of about -0.3.
Between 35 and 41 minutes after the trigger, the afterglow suddenly rebrightened, with a power-law index of about +5.4.
Between 41 and 49 minutes after the trigger, the afterglow faded with a power-law index of about -0.6.
Between 49 and 95 minutes after the trigger, the afterglow faded more rapidly, with a power-law index of about -1.7.
At 95 minutes after the trigger, the afterglow's magnitude was R = 19.51 +0.33 -0.26 (statistical) +/- 0.28 (systematic; calibrated to 40 USNO B1 stars).
Skynet's most recent BVRI light curve, calibrated to USNO B1 and NOMAD stars, can be found here:
http://skynet.unc.edu/grb/grb100316b.png
GCN Circular #10495
S.D. Vergani (APC/Univ. Paris 7), P. D'Avanzo (INAF-OAB), D. Malesani, J.P.U. Fynbo, J. Hjorth (DARK/NBI), A.J. Levan (Univ. Warwick), H. Flores (Paris Obs.), N.R. Tanvir (Univ. Leicester), P. Goldoni (APC/Univ. Paris 7 and SAp/CEA), L.A. Antonelli (INAF-OAR) report on behalf of a larger collaboration:
We observed the optical afterglow of GRB 100316B (Baumgartner et al., GCN 10489; Afonso et al. GCN 10493; Haislip et al., GCN 10494) with the VLT equipped with the X-shooter spectrograph. Observations started on 2010 Mar 16 at 08:43 UT (~ 40 minutes after the GRB), for a total exposure time of 4x600 s. From the acquisition image, we estimate for the optical afterglow a magnitude of R = 18.2 +- 0.1 (calibrated against USNO-B1.0). In a preliminary analysis of the specta, we clearly detect the continuum in the UVB, VIS, and NIR arms, corresponding to the wavelength range 3200-24000 AA. We detect several absorption features, among these FeII(1608), AlII(1670), AlIII(1854), FeII(2344), FeII(2374), FeII(2382), MgII(2796, 2803) and MgI(2852) at a common redshift of z=1.180. The lack of Lyman forest lines down to ~3200 AA sets an upper limit to the redshift z<1.6. We also find evidence for FeII lines and MgII doublet from a strong intervening systems at z=1.063.
We caution that the above analysis (particularly the wavelength solution) is preliminary. Reduction with updated calibrations is underway. We would like to thank the ESO staff for their kind assistance, in particular Linda Schmidtobreick, Christophe Martayan, Patricia Guajardo and Manuel Olivares.
GCN Circular #10500
C. B. Markwardt (GSFC/UMD), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-61 to T+242 sec from recent telemetry downlinks, we report further analysis of BAT GRB 100316B (trigger #416103) (Baumgartner, et al., GCN Circ. 10489). The BAT ground-calculated position is RA, Dec = 163.499, -45.464 deg, which is
```
   RA(J2000)  =  10h 53m 59.8s 
   Dec(J2000) = -45d 27' 49.3" 
```
with an uncertainty of 1.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 83%.
The mask-weighted light curve shows a FRED peak starting at T-0.3 sec, peaking at ~T+0.2 sec, and ending at ~T+20 sec. T90 (15-350 keV) is 3.8 +- 0.5 sec (estimated error including systematics).
The time-averaged spectrum from T-0.4 to T+4.0 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.23 +- 0.18. The fluence in the 15-150 keV band is 2.0 +- 0.2 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T-0.11 sec in the 15-150 keV band is 1.3 +- 0.1 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/416103/BA/
GCN Circular #10502
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 1148 s of XRT Photon Counting mode data and 2 UVOT images for GRB 100316B, 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 = 163.48865, -45.47244 which is equivalent to:
```
RA (J2000): 10h 53m 57.28s
Dec (J2000): -45d 28' 20.8"
```
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 #10508
S. R. Oates (MSSL-UCL) and W. H. Baumgartner (GSFC/UMBC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began observerving the field of GRB 100316B 67s after the BAT trigger (Baumgartner et al., GCN Circ. 10489). We detect the optical afterglow in the white, v, b, u and marginally in the uvw1 filter. The refined UVOT position is RA (J2000)= 163.48809, DEC (J2000)=-45.47265, which is equivalent to:
```
     RA (J2000) = 10:53:57.141
    Dec (J2000) = -45:28:21.54
```
with an estimated uncertainty of 0.52 arcsec (radius, 90% confidence). This position is consistent with the XRT refined position (Beardmore et al., GCN Circ 10502). The marginal detection in the uvw1 filter is consistent with the VLT redshift upper limit (D'Avanzo et al., GCN Circ. 10495).
Preliminary magnitudes and the 3 sigma upper limits are reported below for individual optical images and summed UV images.
```
Filter    T_start(s)  T_stop(s)  Exposure      Mag  Err
###########################################################
white     67           216         147         18.36 +/- 0.05
white     857          1007        147         19.15 +/- 0.09
u	  279          528         246         18.44 +/- 0.10
v         1212         1232        19          18.28 +/- 0.46
b         535          555         19          18.97 +/- 0.36
uvw1	  659          1108        58          18.91 +/- 0.36
uvm2      634          1246        66          > 18.59
uvw2      585          1207        78          > 19.13
###########################################################
```
The above magnitudes are not corrected for the Galactic extinction corresponding to a non-negligible reddening of E_{B-V} = 0.14 mag (Schlegel et al., 1998, ApJS, 500, 525). The photometry is on the UVOT photometric system described in Poole et al. (2008, MNRAS, 383,627).
GCN Circular #10518
O. M. Littlejohns, P. A. Evans, K. L. Page (U. Leicester) and W. H. Baumgartner (GSFC/UMBC) report on behalf of the Swift-XRT team:
We have analysed 2.9 ks of XRT data for GRB 100316B (Baumgartner et al. GCN Circ. 10489), from 75 s to 40.1 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN. Circ 10502).
The light curve can be modelled with a broken power-law decay with an initial decay index of alpha=0.1 (+/-0.2), followed by a break at T~1100 s to a final decay of alpha=1.2 (+0.5, -0.1).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.35 (+0.24, -0.21). The best-fitting absorption column is 4.1 (+2.7, -1.3) x 10^21 cm^-2, at a redshift of 1.18 (Vergani et al. GCN Circ 10495), in addition to the Galactic value of 9.9 x 10^20 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.4 x 10^-11 (5.8 x 10^-11) erg cm^-2 count^-1.
If the light curve continues to decay with a power-law decay index of 1.2, the count rate at T+48 hours will be 6.6 x 10^-4 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.2 x 10^-14 (3.8 x 10^-14) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00416103.
This circular is an official product of the Swift-XRT team.

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Jochen Greiner, last update: 16-Mar-2010 [Disclaimer]