Gamma-ray Burst 130315A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Mar 13 12:46:42 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     551126,   Seg_Num: 0
GRB_RA:          157.542d {+10h 30m 10s} (J2000),
                 157.676d {+10h 30m 42s} (current),
                 157.038d {+10h 28m 09s} (1950)
GRB_DEC:         -51.810d {-51d 48' 36"} (J2000),
                 -51.878d {-51d 52' 40"} (current),
                 -51.553d {-51d 33' 11"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       31661 [cnts]    Image_Peak=492 [image_cnts]
TRIGGER_DUR:     12.160 [sec] 
TRIGGER_INDEX:   491     E_range: 50-350 keV
BKG_INTEN:       151516 [cnts]
BKG_TIME:        45837.67 SOD {12:43:57.67} UT
BKG_DUR:         64 [sec]
GRB_DATE:        16366 TJD;    74 DOY;   13/03/15
GRB_TIME:        45932.97 SOD {12:45:32.97} UT
GRB_PHI:          -0.56 [deg]
GRB_THETA:        44.00 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.63 [sigma]
IMAGE_SIGNIF:    8.07 [sigma]
MERIT_PARAMS:     +1  +0  +0  +4  +3  -2  +0  +1 +56  +0 
SUN_POSTN:       355.50d {+23h 42m 00s}   -1.95d {-01d 56' 51"}
SUN_DIST:        124.10 [deg]   Sun_angle= -10.8 [hr] (East of Sun)
MOON_POSTN:       36.51d {+02h 26m 03s}  +15.22d {+15d 13' 21"}
MOON_DIST:       120.99 [deg]
MOON_ILLUM:      14 [%]
GAL_COORDS:      281.90,  5.20 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      189.53,-54.59 [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 = 173.54,9.88 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Mar 13 12:48:47 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     551126,   Seg_Num: 0
GRB_RA:          157.5465d {+10h 30m 11.16s} (J2000),
                 157.6800d {+10h 30m 43.21s} (current),
                 157.0419d {+10h 28m 10.05s} (1950)
GRB_DEC:         -51.7935d {-51d 47' 36.6"} (J2000),
                 -51.8615d {-51d 51' 41.2"} (current),
                 -51.5367d {-51d 32' 12.0"} (1950)
GRB_ERROR:       4.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.10e-08 [erg/cm2/sec]
GRB_SIGNIF:      15.09 [sigma]
IMG_START_DATE:  16366 TJD;    74 DOY;   13/03/15
IMG_START_TIME:  46093.72 SOD {12:48:13.72} UT,   160.8 [sec] since BAT Trigger Time
TAM[0-3]:        327.65 237.23 261.51 243.57
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       355.50d {+23h 42m 00s}   -1.95d {-01d 56' 49"}
SUN_DIST:        124.12 [deg]   Sun_angle= -10.8 [hr] (East of Sun)
MOON_POSTN:       36.53d {+02h 26m 07s}  +15.23d {+15d 13' 36"}
MOON_DIST:       120.99 [deg]
MOON_ILLUM:      14 [%]
GAL_COORDS:      281.89,  5.21 [deg] galactic lon,lat of the burst
ECL_COORDS:      189.52,-54.58 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.01 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:     Fri 15 Mar 13 12:49:01 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     551126,   Seg_Num: 0
GRB_RA:          157.5465d {+10h 30m 11.1s} (J2000),
                 157.6800d {+10h 30m 43.2s} (current),
                 157.0419d {+10h 28m 10.0s} (1950)
GRB_DEC:         -51.7935d {-51d 47' 36.6"} (J2000),
                 -51.8615d {-51d 51' 41.2"} (current),
                 -51.5367d {-51d 32' 12.0"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       228 [cnts]
IMG_START_DATE:  16366 TJD;    74 DOY;   13/03/15
IMG_START_TIME:  46093.72 SOD {12:48:13.72} UT,   160.8 [sec] since BAT Trigger Time
CENTROID_X:      276.30,  raw= 276  [pixels]
CENTROID_Y:      291.89,  raw= 292  [pixels]
ROLL:            201.83 [deg]
GAIN:            4
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -14.38
GRB_POS_XRT_Z:   -64.59
IMAGE_URL:       sw00551126000msxps_rw.img
SUN_POSTN:       355.50d {+23h 42m 00s}   -1.95d {-01d 56' 49"}
SUN_DIST:        124.12 [deg]   Sun_angle= -10.8 [hr] (East of Sun)
MOON_POSTN:       36.53d {+02h 26m 07s}  +15.23d {+15d 13' 37"}
MOON_DIST:       120.98 [deg]
MOON_ILLUM:      14 [%]
GAL_COORDS:      281.89,  5.21 [deg] galactic lon,lat of the burst
ECL_COORDS:      189.52,-54.58 [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:     Fri 15 Mar 13 12:49:09 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     551126,   Seg_Num: 0
GRB_RA:          157.5465d {+10h 30m 11.1s} (J2000),
                 157.6800d {+10h 30m 43.2s} (current),
                 157.0419d {+10h 28m 10.0s} (1950)
GRB_DEC:         -51.7935d {-51d 47' 36.6"} (J2000),
                 -51.8615d {-51d 51' 41.2"} (current),
                 -51.5367d {-51d 32' 12.0"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       228 [cnts]
IMG_START_DATE:  16366 TJD;    74 DOY;   13/03/15
IMG_START_TIME:  46093.72 SOD {12:48:13.72} UT,   160.8 [sec] since BAT Trigger Time
CENTROID_X:      276.30,  raw= 276  [pixels]
CENTROID_Y:      291.89,  raw= 292  [pixels]
ROLL:            201.83 [deg]
GAIN:            4
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -14.38
GRB_POS_XRT_Z:   -64.59
IMAGE_URL:       sw00551126000msxps_rw.img
SUN_POSTN:       355.50d {+23h 42m 00s}   -1.95d {-01d 56' 49"}
SUN_DIST:        124.12 [deg]   Sun_angle= -10.8 [hr] (East of Sun)
MOON_POSTN:       36.53d {+02h 26m 08s}  +15.23d {+15d 13' 38"}
MOON_DIST:       120.98 [deg]
MOON_ILLUM:      14 [%]
GAL_COORDS:      281.89,  5.21 [deg] galactic lon,lat of the burst
ECL_COORDS:      189.52,-54.58 [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:     Fri 15 Mar 13 12:49:36 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     551126,   Seg_Num: 0
GRB_RA:          157.542d {+10h 30m 10s} (J2000),
                 157.676d {+10h 30m 42s} (current),
                 157.038d {+10h 28m 09s} (1950)
GRB_DEC:         -51.810d {-51d 48' 36"} (J2000),
                 -51.878d {-51d 52' 40"} (current),
                 -51.553d {-51d 33' 11"} (1950)
GRB_DATE:        16366 TJD;    74 DOY;   13/03/15
GRB_TIME:        45932.97 SOD {12:45:32.97} UT
TRIGGER_INDEX:   491
GRB_PHI:          -0.56 [deg]
GRB_THETA:        44.00 [deg]
DELTA_TIME:      71.00 [sec]
TRIGGER_DUR:     12.160 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.63 [sigma]
IMAGE_SIGNIF:    8.07 [sigma]
LC_URL:          sw00551126000msb.lc
SUN_POSTN:       355.50d {+23h 42m 00s}   -1.95d {-01d 56' 49"}
SUN_DIST:        124.10 [deg]   Sun_angle= -10.8 [hr] (East of Sun)
MOON_POSTN:       36.54d {+02h 26m 09s}  +15.23d {+15d 13' 42"}
MOON_DIST:       120.98 [deg]
MOON_ILLUM:      14 [%]
GAL_COORDS:      281.90,  5.20 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      189.53,-54.59 [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 = 173.54,9.88 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Mar 13 12:51:26 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     551126,   Seg_Num: 0
POINT_RA:        157.563d {+10h 30m 15s} (J2000)
POINT_DEC:       -51.779d {-51d 46' 42"} (J2000)
POINT_ROLL:      201.825d
IMG_START_DATE:  16366 TJD;    74 DOY;   13/03/15
IMG_START_TIME:  46104.33 SOD {12:48:24.33} UT,   171.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.827
N_STARS:         190
X_OFFSET:        609 [pixels]
Y_OFFSET:        520 [pixels]
X_MAX:           1568 [pixels]
Y_MAX:           1479 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00551126000msufc0171.fits
SUN_POSTN:       355.50d {+23h 42m 01s}   -1.95d {-01d 56' 47"}
SUN_DIST:        124.13 [deg]   Sun_angle= -10.8 [hr] (East of Sun)
MOON_POSTN:       36.55d {+02h 26m 12s}  +15.23d {+15d 13' 55"}
MOON_DIST:       120.99 [deg]
MOON_ILLUM:      14 [%]
GAL_COORDS:      281.89,  5.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      189.52,-54.56 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Mar 13 12:51:52 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     551126,   Seg_Num: 0
POINT_RA:        157.563d {+10h 30m 15s} (J2000)
POINT_DEC:       -51.779d {-51d 46' 42"} (J2000)
POINT_ROLL:      201.825d
IMG_START_DATE:  16366 TJD;    74 DOY;   13/03/15
IMG_START_TIME:  46104.33 SOD {12:48:24.33} UT,   171.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.827
N_STARS:         190
X_OFFSET:        609 [pixels]
Y_OFFSET:        520 [pixels]
X_MAX:           1568 [pixels]
Y_MAX:           1479 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00551126000msufc0171.fits
SUN_POSTN:       355.50d {+23h 42m 01s}   -1.95d {-01d 56' 46"}
SUN_DIST:        124.13 [deg]   Sun_angle= -10.8 [hr] (East of Sun)
MOON_POSTN:       36.56d {+02h 26m 13s}  +15.23d {+15d 13' 58"}
MOON_DIST:       120.99 [deg]
MOON_ILLUM:      14 [%]
GAL_COORDS:      281.89,  5.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      189.52,-54.56 [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:     Fri 15 Mar 13 12:52:54 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     551126,   Seg_Num: 0
POINT_RA:        157.563d {+10h 30m 15s} (J2000)
POINT_DEC:       -51.779d {-51d 46' 42"} (J2000)
ROLL:            201.825d
IMG_START_DATE:  16366 TJD;    74 DOY;   13/03/15
IMG_START_TIME:  46104.33 SOD {12:48:24.33} UT,   171.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     385044514
X_OFFSET:        929 [pixels]
Y_OFFSET:        840 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1089
Y_GRB_POS:       1000
BINNING_INDEX:   1
IM_URL:          sw00551126000msuni0182.fits
SUN_POSTN:       355.50d {+23h 42m 01s}   -1.95d {-01d 56' 45"}
SUN_DIST:        124.13 [deg]   Sun_angle= -10.8 [hr] (East of Sun)
MOON_POSTN:       36.56d {+02h 26m 16s}  +15.23d {+15d 14' 06"}
MOON_DIST:       120.98 [deg]
MOON_ILLUM:      14 [%]
GAL_COORDS:      281.89,  5.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      189.52,-54.56 [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:     Fri 15 Mar 13 12:53:11 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     551126,   Seg_Num: 0
POINT_RA:        157.563d {+10h 30m 15s} (J2000)
POINT_DEC:       -51.779d {-51d 46' 42"} (J2000)
ROLL:            201.825d
IMG_START_DATE:  16366 TJD;    74 DOY;   13/03/15
IMG_START_TIME:  46104.33 SOD {12:48:24.33} UT,   171.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     385044514
X_OFFSET:        929 [pixels]
Y_OFFSET:        840 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1089
Y_GRB_POS:       1000
BINNING_INDEX:   1
IM_URL:          sw00551126000msuni0182.fits
SUN_POSTN:       355.50d {+23h 42m 01s}   -1.95d {-01d 56' 45"}
SUN_DIST:        124.13 [deg]   Sun_angle= -10.8 [hr] (East of Sun)
MOON_POSTN:       36.57d {+02h 26m 16s}  +15.24d {+15d 14' 08"}
MOON_DIST:       120.98 [deg]
MOON_ILLUM:      14 [%]
GAL_COORDS:      281.89,  5.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      189.52,-54.56 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Mar 13 12:58:22 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     551126,   Seg_Num: 0
POINT_RA:        157.564d {+10h 30m 15s} (J2000)
POINT_DEC:       -51.778d {-51d 46' 41"} (J2000)
POINT_ROLL:      201.823d
IMG_START_DATE:  16366 TJD;    74 DOY;   13/03/15
IMG_START_TIME:  46263.52 SOD {12:51:03.52} UT,   330.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.910
N_STARS:         190
X_OFFSET:        609 [pixels]
Y_OFFSET:        520 [pixels]
X_MAX:           1568 [pixels]
Y_MAX:           1479 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00551126000msufc0330.fits
SUN_POSTN:       355.51d {+23h 42m 02s}   -1.94d {-01d 56' 40"}
SUN_DIST:        124.14 [deg]   Sun_angle= -10.8 [hr] (East of Sun)
MOON_POSTN:       36.61d {+02h 26m 27s}  +15.25d {+15d 14' 45"}
MOON_DIST:       120.97 [deg]
MOON_ILLUM:      14 [%]
GAL_COORDS:      281.89,  5.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      189.52,-54.56 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Mar 13 12:58:51 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     551126,   Seg_Num: 0
POINT_RA:        157.564d {+10h 30m 15s} (J2000)
POINT_DEC:       -51.778d {-51d 46' 41"} (J2000)
POINT_ROLL:      201.823d
IMG_START_DATE:  16366 TJD;    74 DOY;   13/03/15
IMG_START_TIME:  46263.52 SOD {12:51:03.52} UT,   330.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.910
N_STARS:         190
X_OFFSET:        609 [pixels]
Y_OFFSET:        520 [pixels]
X_MAX:           1568 [pixels]
Y_MAX:           1479 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00551126000msufc0330.fits
SUN_POSTN:       355.51d {+23h 42m 02s}   -1.94d {-01d 56' 39"}
SUN_DIST:        124.14 [deg]   Sun_angle= -10.8 [hr] (East of Sun)
MOON_POSTN:       36.62d {+02h 26m 28s}  +15.25d {+15d 14' 49"}
MOON_DIST:       120.96 [deg]
MOON_ILLUM:      14 [%]
GAL_COORDS:      281.89,  5.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      189.52,-54.56 [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:     Fri 15 Mar 13 12:59:53 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     551126,   Seg_Num: 0
POINT_RA:        157.564d {+10h 30m 15s} (J2000)
POINT_DEC:       -51.778d {-51d 46' 41"} (J2000)
ROLL:            201.823d
IMG_START_DATE:  16366 TJD;    74 DOY;   13/03/15
IMG_START_TIME:  46263.52 SOD {12:51:03.52} UT,   330.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     385044673
X_OFFSET:        929 [pixels]
Y_OFFSET:        840 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1089
Y_GRB_POS:       1000
BINNING_INDEX:   1
IM_URL:          sw00551126000msuni0341.fits
SUN_POSTN:       355.51d {+23h 42m 02s}   -1.94d {-01d 56' 38"}
SUN_DIST:        124.14 [deg]   Sun_angle= -10.8 [hr] (East of Sun)
MOON_POSTN:       36.63d {+02h 26m 30s}  +15.25d {+15d 14' 56"}
MOON_DIST:       120.96 [deg]
MOON_ILLUM:      14 [%]
GAL_COORDS:      281.89,  5.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      189.52,-54.56 [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:     Fri 15 Mar 13 13:00:01 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     551126,   Seg_Num: 0
POINT_RA:        157.564d {+10h 30m 15s} (J2000)
POINT_DEC:       -51.778d {-51d 46' 41"} (J2000)
ROLL:            201.823d
IMG_START_DATE:  16366 TJD;    74 DOY;   13/03/15
IMG_START_TIME:  46263.52 SOD {12:51:03.52} UT,   330.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     385044673
X_OFFSET:        929 [pixels]
Y_OFFSET:        840 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1089
Y_GRB_POS:       1000
BINNING_INDEX:   1
IM_URL:          sw00551126000msuni0341.fits
SUN_POSTN:       355.51d {+23h 42m 02s}   -1.94d {-01d 56' 38"}
SUN_DIST:        124.14 [deg]   Sun_angle= -10.8 [hr] (East of Sun)
MOON_POSTN:       36.63d {+02h 26m 30s}  +15.25d {+15d 14' 57"}
MOON_DIST:       120.96 [deg]
MOON_ILLUM:      14 [%]
GAL_COORDS:      281.89,  5.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      189.52,-54.56 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Mar 13 13:01:41 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     551126,   Seg_Num: 0
GRB_RA:          157.5470d {+10h 30m 11.27s} (J2000),
                 157.6805d {+10h 30m 43.33s} (current),
                 157.0424d {+10h 28m 10.17s} (1950)
GRB_DEC:         -51.7945d {-51d 47' 40.1"} (J2000),
                 -51.8625d {-51d 51' 44.8"} (current),
                 -51.5377d {-51d 32' 15.6"} (1950)
GRB_ERROR:       1.1 [arcsec radius, statistical only]
GRB_MAG:         18.04 +/- 0.40 [mag]
FILTER:          7, U
IMG_START_DATE:  16366 TJD;    74 DOY;   13/03/15
IMG_START_TIME:  46262.00 SOD {12:51:02.00} UT,   329.0 [sec] since BAT Trigger Time
SUN_POSTN:       355.51d {+23h 42m 02s}   -1.94d {-01d 56' 37"}
SUN_DIST:        124.12 [deg]   Sun_angle= -10.8 [hr] (East of Sun)
MOON_POSTN:       36.64d {+02h 26m 34s}  +15.25d {+15d 15' 10"}
MOON_DIST:       120.94 [deg]
MOON_ILLUM:      14 [%]
GAL_COORDS:      281.89,  5.21 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      189.52,-54.58 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The UVOT position is 4.0 arcsec from the XRT position.  
COMMENTS:        Result based on srclist data.  
COMMENTS:        Notice generated automatically.

GCN Circular #14311
P. A. Evans (U Leicester), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), B.P. Gompertz (U Leicester), J. A. Kennea (PSU), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), M. H. Siegel (PSU), R. L. C. Starling (U Leicester) and E. Troja (NASA/GSFC/UMCP) report on behalf of the Swift Team:
At 12:45:32 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 130315A (trigger=551126). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 157.542, -51.810 which is
```
   RA(J2000)  =  10h 30m 10s
   Dec(J2000) = -51d 48' 36"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows multiple peaks with a total duration of about 40 sec. The peak count rate was ~1100 counts/sec (15-350 keV), at ~10 sec after the trigger. There is a possible flare at T+160 sec.
The XRT began observing the field at 12:48:13.7 UT, 160.7 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 157.54648, -51.79244 which is equivalent to:
```
   RA(J2000)  = 10h 30m 11.16s
   Dec(J2000) = -51d 47' 32.8"
```
with an uncertainty of 5.0 arcseconds (radius, 90% containment). This location is 63 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 2.27 x 10^21 cm^-2 (Kalberla et al. 2005).
The initial flux in the 2.5 s image was 1.10e-08 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 171 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 0.36.
Burst Advocate for this burst is P. A. Evans (pae9 AT star.le.ac.uk). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 15 Mar 13 13:10:24 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     551126,   Seg_Num: 0
GRB_RA:          157.5456d {+10h 30m 10.94s} (J2000),
                 157.6791d {+10h 30m 42.99s} (current),
                 157.0410d {+10h 28m 09.83s} (1950)
GRB_DEC:         -51.7939d {-51d 47' 38.0"} (J2000),
                 -51.8619d {-51d 51' 42.6"} (current),
                 -51.5371d {-51d 32' 13.4"} (1950)
GRB_ERROR:       4.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16366 TJD;    74 DOY;   13/03/15
IMG_START_TIME:  46401.00 SOD {12:53:21.00} UT,   468.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       355.51d {+23h 42m 04s}   -1.94d {-01d 56' 28"}
SUN_DIST:        124.12 [deg]   Sun_angle= -10.8 [hr] (East of Sun)
MOON_POSTN:       36.72d {+02h 26m 52s}  +15.27d {+15d 16' 13"}
MOON_DIST:       120.91 [deg]
MOON_ILLUM:      14 [%]
GAL_COORDS:      281.89,  5.21 [deg] galactic lon,lat of the burst
ECL_COORDS:      189.52,-54.58 [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 0.11% < P(seren) < 0.58%.

GCN Circular #14312
J.C. Tello, R. S=E1nchez-Ramirez, M. Jelinek (IAA-CSIC Granada), J. Gorosabel (UPV/EHU-IAA/CSIC), W. Allen (Vintage Lane Obs.), Ph. Yock (Auckland Univ.), P. Kubanek (IP AS CR & IAA-CSIC), and A. J. Castro-Tirado (IAA-CSIC) report on behalf of a larger collaboration:
"We observed the field of GRB 130315A (Evans et al., GCNC 14311), detected by Swift/BAT, with the 0.6m Yock-Allen robotic telescope (BOOTES-3) located in Blenheim, New Zealand. Unfiltered images were obtained starting 13:21:02UT (35m after the burst, limited by clouds). An exposure of 30 seconds revealed no uncatalogued sources down to a magnitude of RMag~16.5 when compared to the USNO-B1 catalogue."
GCN Circular #14315
S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), P. A. Evans (U Leicester) N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (MSU) (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 130315A (trigger #551126) (Evans, et al., GCN Circ. 14311). The BAT ground-calculated position is RA, Dec = 157.541, -51.794 deg which is
```
    RA(J2000)  =  10h 30m 09.9s
    Dec(J2000) = -51d 47' 37.4"
```
with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 42%.
The mask-weighted light curve shows two broad peaks, the first starting at ~T-10 sec, peaking at T+10 sec and then slowly declining until ~T+70 sec. The rise to the second peak begins almost immediately, with a broad peak around T+160 sec and falling to background by T+240 sec. Note that a slew took the source out of the field of view at ~T+650 sec. T90 (15-350 keV) is 233.4 +- 17.5 sec (estimated error including systematics).
The time-averaged spectrum from T-3.30 to T+268.00 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.81 +- 0.08. The fluence in the 15-150 keV band is 4.9 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+8.41 sec in the 15-150 keV band is 1.0 +- 0.2 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/551126/BA/
GCN Circular #14317
K.L. Page (U. Leicester), C. Pagani (U. Leicester), G. Stratta (ASDC), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), M.C. Stroh (PSU), D.N. Burrows (PSU), J.A. Kennea (PSU), A.P. Beardmore (U. Leicester) and P.A. Evans report on behalf of the Swift-XRT team:
We have analysed 10 ks of XRT data for GRB 130315A (Evans et al. GCN Circ. 14311), from 167 s to 29.4 ks after the BAT trigger. The data comprise 337 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The refined XRT position is RA, Dec = 157.54687, -51.79362 which is equivalent to:
```
RA (J2000): 10 30 11.25
Dec(J2000): -51 47 37.0
```
with an uncertainty of 3.6 arcsec (radius, 90% confidence).
The light curve can be modelled with a power-law decay with a decay index of alpha=.
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.49 (+/-0.04). The best-fitting absorption column is 2.88 (+0.19, -0.18) x 10^21 cm^-2, in excess of the Galactic value of 2.3 x 10^21 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 2.1 (+/-0.3) and a best-fitting absorption column of 3.1 (+1.2, -0.8) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.9 x 10^-11 (6.7 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     3.1 (+1.2, -0.8) x 10^21 cm^-2
Galactic foreground: 2.3 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     2.1 (+/-0.3)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00551126.
This circular is an official product of the Swift-XRT team.
GCN Circular #14320
T. E. Pickering, P. Vaisanen, V. van Wyk report on behalf of SALT:
We have observed the field of GRB 130315A (Evans et al. GCN 14311) using the RSS imager/spectrograph at the Southern African Large Telescope (SALT). The observations began at 17:40 UT, just under 5 hours after the initial Swift trigger. Imaging was performed using a broadband filter with a blue cutoff at 4600 A and three narrow-band filters centered at 4820 A, 6530 A, and 8175 A. The data were somewhat hampered by scattered clouds and mediocre seeing. Comparison to a DSS2 red image finds no evidence of a new source within the error circle of the refined XRT position (3.6"; Page et al. GCN 14317). The limiting magnitude of our best images is roughly ~0.5 mag deeper than the DSS2 image which gives a detection upper limit of r ~ 21 based on comparison with nearby stars in the GSC 2.3.
This message may be cited.
GCN Circular #14323
S. T. Holland (STScI) and P. A. Evans (U Leicester) report on behalf of the Swift/UVOT team:
Swift/UVOT began settled observations of the field of GRB 130315A starting 171 s after the BAT trigger (Evans et al., 2013, GCNC 14311). We do not detect any new source within the XRT error circle (Page et al., 2013, GCNC 14317). Preliminary UVOT 3-sigma upper limits at this position are presented below.
```
------------------------------------------------
Filter      TSTART     TSTOP    Exposure     Mag
------------------------------------------------
white (FC)     171       321         147   >21.1 
    u (FC)     330       580         246   >20.3 
------------------------------------------------
    v         4476    23,657        1136   >20.7 
    b         3860    28,925        1685   >21.7 
    u          330    17,889        1443   >21.4 
 uvw1         4887    17,764        1995   >21.3 
 uvm2         4681    16,857        1277   >21.0 
 uvw2         4271    22,898        1279   >21.2 
white          171    29.424        1022   >22.2 
------------------------------------------------
```
The quoted upper limits have not been corrected for the Galactic extinction along the line of sight to this burst of E_{B-V} = 0.32 mag (Schlafly et al. 2011, ApJS, 737, 103). The photometry is in the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373). The photometry is affected by the presence of a J = 15.4 mag 2MASS source 10301128-5147395 located 2.3 arcsec south of the XRT position.
GCN Circular #14325
S. Schmidl (TLS Tautenburg), J. Elliott (MPE Garching), A. Nicuesa Guelbenzu (TLS Tautenburg), S. Klose (TLS Tautenburg), and J. Greiner (MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 130315A (Swift trigger 551126; Evans et al., GCN 14311) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG/ESO telescope at La Silla Observatory (Chile).
First-epoch observations started on March 15, 2013, at 23:51 UT, 11.1 hrs after the GRB trigger. They were performed at an average seeing of 0."7 and at an average airmass of 1.18. No evidence for a fading afterglow was found.
Second-epoch observations were executed the following night (38.4 hr after the trigger) under slightly worse observing conditions. A comparison with the first-epoch images reveales a fading source at the south-east border of the Swift/XRT error circle (Page et al., GCN 14317) at coordinates
```
RA (J2000.0)  =  10:30:11.54
Dec (J2000.0) = -51:47:39.8
```
with an uncertainty of 0."5 in each coordinate.
Based on a total exposure time of 1500 s in r'i'z' at a midtime of 12.8 hrs after the burst, for this source we measure the following preliminary AB magnitudes:
```
r' = 22.0 +/- 0.1,
i' = 21.5 +/- 0.1,
z' = 21.1 +/- 0.1.
```
Between both epochs this object faded by more than 1 magnitude, implying a decay with alpha > 0.75.
The given magnitudes are calibrated against GROND zeropoints. The Galactic reddening along the line of sight is E(B-V)= 0.36 mag (Schlegel et al. 1998).
GCN Circular #14330
GRB 130315A: Zadko observatory - Gingin optical observations
------------------------------**------------------------------**----------
H. Dereli (UNS-CNRS-OCA), A. Klotz (IRAP-CNRS-OMP), D. Macpherson (UWA/ICRAR), D. Coward (UWA), B. Gendre (IRAP-CNRS-OMP), M. Boer, K. Siellez, O. Bardho (UNS-CNRS-OCA), A. Williams (PO-UWA), R. Martin (PO-UWA) report:
We imaged the field of GRB 130315A detected by SWIFT (trigger 551126) with the Zadko robotic telescope (D=100cm) located at the observatory - Gingin, Australia.
The observations started 1.22h after the GRB trigger. The elevation of the field increased from 65 degrees above horizon and weather conditions were good.
We co-added a series of unfiltered exposures and we substracted images taken with the same telescope 4h to 8h later to eliminate contaminations by foreground stars. We did not detect any optical transient at the position provided by Schmidl et al. (GCNC 14325):
t0+1.22h to t0+1.54h : Rlim = 20.4
This limiting magnitude and the detection of Schmidl et al. (GCNC 14325) implies a decay with alpha < 0.67. As Schmidl et al. (GCNC 14325) announced alpha > 0.75 after 12h we suspect a late rising of a faint afterglow or a break of the decay.
Magnitudes were estimated with the nearby NOMAD1 stars and are not corrected for galactic dust extinction.

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Jochen Greiner, last update: 26-Mar-2013 [Disclaimer]