Gamma-ray Burst 140331A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 31 Mar 14 06:09:36 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     594081,   Seg_Num: 0
GRB_RA:          134.845d {+08h 59m 23s} (J2000),
                 135.030d {+09h 00m 07s} (current),
                 134.194d {+08h 56m 47s} (1950)
GRB_DEC:          +2.707d {+02d 42' 25"} (J2000),
                  +2.651d {+02d 39' 03"} (current),
                  +2.902d {+02d 54' 08"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=3497 [image_cnts]
TRIGGER_DUR:     320.000 [sec]   (=5.3 [min])
TRIGGER_INDEX:   20000     E_range: 15-50 keV
BKG_INTEN:       0 [cnts]
BKG_TIME:        0.00 SOD {00:00:00.00} UT
BKG_DUR:         0 [sec]
GRB_DATE:        16747 TJD;    90 DOY;   14/03/31
GRB_TIME:        20988.17 SOD {05:49:48.17} UT
GRB_PHI:          48.36 [deg]
GRB_THETA:         9.04 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    7.74 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  -2  +0  +0 +57  +0 
SUN_POSTN:         9.61d {+00h 38m 27s}   +4.14d {+04d 08' 21"}
SUN_DIST:        125.04 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:       15.05d {+01h 00m 12s}   +7.49d {+07d 29' 18"}
MOON_DIST:       119.27 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      226.17, 29.50 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      136.49,-13.79 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This Notice was delayed by more than 60 sec past the end of the trigger integration interval;  
COMMENTS:        probably due to it occurring during a Malindi downlink session.  
COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
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 = 176.45,17.26 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 31 Mar 14 06:10:24 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     594081,   Seg_Num: 0
GRB_RA:          134.8654d {+08h 59m 27.69s} (J2000),
                 135.0505d {+09h 00m 12.13s} (current),
                 134.2151d {+08h 56m 51.63s} (1950)
GRB_DEC:          +2.7156d {+02d 42' 56.1"} (J2000),
                  +2.6596d {+02d 39' 34.4"} (current),
                  +2.9109d {+02d 54' 39.1"} (1950)
GRB_ERROR:       6.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       6.70e-10 [erg/cm2/sec]
GRB_SIGNIF:      6.32 [sigma]
IMG_START_DATE:  16747 TJD;    90 DOY;   14/03/31
IMG_START_TIME:  21373.21 SOD {05:56:13.21} UT,   385.0 [sec] since BAT Trigger Time
TAM[0-3]:        327.63 237.20 261.69 243.39
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:         9.61d {+00h 38m 27s}   +4.14d {+04d 08' 22"}
SUN_DIST:        125.05 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:       15.06d {+01h 00m 13s}   +7.49d {+07d 29' 26"}
MOON_DIST:       119.28 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      226.17, 29.52 [deg] galactic lon,lat of the burst
ECL_COORDS:      136.51,-13.78 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.35 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 31 Mar 14 06:10:35 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     594081,   Seg_Num: 0
GRB_RA:          134.8654d {+08h 59m 27.6s} (J2000),
                 135.0505d {+09h 00m 12.1s} (current),
                 134.2151d {+08h 56m 51.6s} (1950)
GRB_DEC:          +2.7156d {+02d 42' 56.1"} (J2000),
                  +2.6596d {+02d 39' 34.4"} (current),
                  +2.9109d {+02d 54' 39.1"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       40 [cnts]
IMG_START_DATE:  16747 TJD;    90 DOY;   14/03/31
IMG_START_TIME:  21373.21 SOD {05:56:13.21} UT,   385.0 [sec] since BAT Trigger Time
CENTROID_X:      334.61,  raw= 335  [pixels]
CENTROID_Y:      278.78,  raw= 279  [pixels]
ROLL:            276.93 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -44.81
GRB_POS_XRT_Z:   69.11
IMAGE_URL:       sw00594081000msxps_rw.img
SUN_POSTN:         9.61d {+00h 38m 27s}   +4.14d {+04d 08' 22"}
SUN_DIST:        125.05 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:       15.06d {+01h 00m 14s}   +7.49d {+07d 29' 28"}
MOON_DIST:       119.28 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      226.17, 29.52 [deg] galactic lon,lat of the burst
ECL_COORDS:      136.51,-13.78 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 31 Mar 14 06:11:02 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     594081,   Seg_Num: 0
GRB_RA:          134.845d {+08h 59m 23s} (J2000),
                 135.030d {+09h 00m 07s} (current),
                 134.194d {+08h 56m 47s} (1950)
GRB_DEC:          +2.707d {+02d 42' 25"} (J2000),
                  +2.651d {+02d 39' 03"} (current),
                  +2.902d {+02d 54' 08"} (1950)
GRB_DATE:        16747 TJD;    90 DOY;   14/03/31
GRB_TIME:        20988.17 SOD {05:49:48.17} UT
TRIGGER_INDEX:   20000
GRB_PHI:          48.36 [deg]
GRB_THETA:         9.04 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     320.000 [sec]   (=5.3 [min])
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    7.74 [sigma]
LC_URL:          sw00594081000msb.lc
SUN_POSTN:         9.61d {+00h 38m 27s}   +4.14d {+04d 08' 22"}
SUN_DIST:        125.03 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:       15.06d {+01h 00m 15s}   +7.49d {+07d 29' 33"}
MOON_DIST:       119.25 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      226.17, 29.50 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      136.49,-13.79 [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 an image 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 = 176.45,17.26 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 31 Mar 14 06:10:48 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     594081,   Seg_Num: 0
GRB_RA:          134.8654d {+08h 59m 27.6s} (J2000),
                 135.0505d {+09h 00m 12.1s} (current),
                 134.2151d {+08h 56m 51.6s} (1950)
GRB_DEC:          +2.7156d {+02d 42' 56.1"} (J2000),
                  +2.6596d {+02d 39' 34.4"} (current),
                  +2.9109d {+02d 54' 39.1"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       40 [cnts]
IMG_START_DATE:  16747 TJD;    90 DOY;   14/03/31
IMG_START_TIME:  21373.21 SOD {05:56:13.21} UT,   385.0 [sec] since BAT Trigger Time
CENTROID_X:      334.61,  raw= 335  [pixels]
CENTROID_Y:      278.78,  raw= 279  [pixels]
ROLL:            276.93 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -44.81
GRB_POS_XRT_Z:   69.11
IMAGE_URL:       sw00594081000msxps_rw.img
SUN_POSTN:         9.61d {+00h 38m 27s}   +4.14d {+04d 08' 22"}
SUN_DIST:        125.05 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:       15.06d {+01h 00m 14s}   +7.49d {+07d 29' 31"}
MOON_DIST:       119.28 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      226.17, 29.52 [deg] galactic lon,lat of the burst
ECL_COORDS:      136.51,-13.78 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 31 Mar 14 06:11:28 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     594081,   Seg_Num: 0
POINT_RA:        134.845d {+08h 59m 23s} (J2000)
POINT_DEC:        +2.706d {+02d 42' 22"} (J2000)
POINT_ROLL:      276.928d
IMG_START_DATE:  16747 TJD;    90 DOY;   14/03/31
IMG_START_TIME:  21381.81 SOD {05:56:21.81} UT,   393.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.361
N_STARS:         44
X_OFFSET:        480 [pixels]
Y_OFFSET:        576 [pixels]
X_MAX:           1439 [pixels]
Y_MAX:           1535 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00594081000msufc0393.fits
SUN_POSTN:         9.61d {+00h 38m 27s}   +4.14d {+04d 08' 23"}
SUN_DIST:        125.03 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:       15.07d {+01h 00m 16s}   +7.49d {+07d 29' 38"}
MOON_DIST:       119.25 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      226.17, 29.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      136.50,-13.79 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 31 Mar 14 06:12:07 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     594081,   Seg_Num: 0
POINT_RA:        134.845d {+08h 59m 23s} (J2000)
POINT_DEC:        +2.706d {+02d 42' 22"} (J2000)
POINT_ROLL:      276.928d
IMG_START_DATE:  16747 TJD;    90 DOY;   14/03/31
IMG_START_TIME:  21381.81 SOD {05:56:21.81} UT,   393.6 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.361
N_STARS:         44
X_OFFSET:        480 [pixels]
Y_OFFSET:        576 [pixels]
X_MAX:           1439 [pixels]
Y_MAX:           1535 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00594081000msufc0393.fits
SUN_POSTN:         9.61d {+00h 38m 27s}   +4.14d {+04d 08' 23"}
SUN_DIST:        125.03 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:       15.07d {+01h 00m 17s}   +7.50d {+07d 29' 44"}
MOON_DIST:       119.24 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      226.17, 29.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      136.50,-13.79 [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 31 Mar 14 06:12:46 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     594081,   Seg_Num: 0
POINT_RA:        134.845d {+08h 59m 23s} (J2000)
POINT_DEC:        +2.706d {+02d 42' 22"} (J2000)
ROLL:            276.928d
IMG_START_DATE:  16747 TJD;    90 DOY;   14/03/31
IMG_START_TIME:  21381.81 SOD {05:56:21.81} UT,   393.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     417938193
X_OFFSET:        719 [pixels]
Y_OFFSET:        1028 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       879
Y_GRB_POS:       1188
BINNING_INDEX:   1
IM_URL:          sw00594081000msuni0405.fits
SUN_POSTN:         9.61d {+00h 38m 27s}   +4.14d {+04d 08' 24"}
SUN_DIST:        125.03 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:       15.08d {+01h 00m 19s}   +7.50d {+07d 29' 51"}
MOON_DIST:       119.24 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      226.17, 29.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      136.50,-13.79 [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:     Mon 31 Mar 14 06:13:01 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     594081,   Seg_Num: 0
POINT_RA:        134.845d {+08h 59m 23s} (J2000)
POINT_DEC:        +2.706d {+02d 42' 22"} (J2000)
ROLL:            276.928d
IMG_START_DATE:  16747 TJD;    90 DOY;   14/03/31
IMG_START_TIME:  21381.81 SOD {05:56:21.81} UT,   393.6 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     417938193
X_OFFSET:        719 [pixels]
Y_OFFSET:        1028 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       879
Y_GRB_POS:       1188
BINNING_INDEX:   1
IM_URL:          sw00594081000msuni0405.fits
SUN_POSTN:         9.61d {+00h 38m 27s}   +4.14d {+04d 08' 24"}
SUN_DIST:        125.03 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:       15.08d {+01h 00m 19s}   +7.50d {+07d 29' 54"}
MOON_DIST:       119.24 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      226.17, 29.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      136.50,-13.79 [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:     Mon 31 Mar 14 06:15:51 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     594081,   Seg_Num: 0
POINT_RA:        134.845d {+08h 59m 23s} (J2000)
POINT_DEC:        +2.704d {+02d 42' 16"} (J2000)
POINT_ROLL:      276.927d
IMG_START_DATE:  16747 TJD;    90 DOY;   14/03/31
IMG_START_TIME:  21858.56 SOD {06:04:18.56} UT,   870.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.189
N_STARS:         137
X_OFFSET:        159 [pixels]
Y_OFFSET:        468 [pixels]
X_MAX:           1598 [pixels]
Y_MAX:           1907 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00594081000msufc0870.fits
SUN_POSTN:         9.62d {+00h 38m 28s}   +4.14d {+04d 08' 27"}
SUN_DIST:        125.03 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:       15.11d {+01h 00m 26s}   +7.51d {+07d 30' 24"}
MOON_DIST:       119.21 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      226.17, 29.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      136.50,-13.79 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 31 Mar 14 06:16:23 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     594081,   Seg_Num: 0
POINT_RA:        134.845d {+08h 59m 23s} (J2000)
POINT_DEC:        +2.704d {+02d 42' 16"} (J2000)
POINT_ROLL:      276.927d
IMG_START_DATE:  16747 TJD;    90 DOY;   14/03/31
IMG_START_TIME:  21858.56 SOD {06:04:18.56} UT,   870.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.189
N_STARS:         137
X_OFFSET:        159 [pixels]
Y_OFFSET:        468 [pixels]
X_MAX:           1598 [pixels]
Y_MAX:           1907 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00594081000msufc0870.fits
SUN_POSTN:         9.62d {+00h 38m 28s}   +4.14d {+04d 08' 27"}
SUN_DIST:        125.03 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:       15.11d {+01h 00m 27s}   +7.51d {+07d 30' 29"}
MOON_DIST:       119.20 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      226.17, 29.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      136.50,-13.79 [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 31 Mar 14 06:18:07 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     594081,   Seg_Num: 0
GRB_RA:          134.8643d {+08h 59m 27.43s} (J2000),
                 135.0494d {+09h 00m 11.86s} (current),
                 134.2140d {+08h 56m 51.36s} (1950)
GRB_DEC:          +2.7174d {+02d 43' 02.6"} (J2000),
                  +2.6614d {+02d 39' 40.9"} (current),
                  +2.9127d {+02d 54' 45.6"} (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:  16747 TJD;    90 DOY;   14/03/31
IMG_START_TIME:  21506.00 SOD {05:58:26.00} UT,   517.8 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:         9.62d {+00h 38m 28s}   +4.14d {+04d 08' 29"}
SUN_DIST:        125.05 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:       15.13d {+01h 00m 31s}   +7.51d {+07d 30' 48"}
MOON_DIST:       119.20 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      226.17, 29.52 [deg] galactic lon,lat of the burst
ECL_COORDS:      136.51,-13.78 [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 #16049
B.-B. Zhang (UAH), S. D. Barthelmy (GSFC), V. D'Elia (ASDC), J. A. Kennea (PSU), K. L. Page (U Leicester), D. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 05:49:48 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 140331A (trigger=594081). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 134.845, +2.707 which is
```
   RA(J2000) = 08h 59m 23s
   Dec(J2000) = +02d 42' 25"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). As is usual for an image trigger, there is no obvious variation in the BAT light curve.
The XRT began observing the field at 05:56:13.2 UT, 385.0 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source with an enhanced position: RA, Dec 134.8644, 2.7174 which is equivalent to:
```
   RA(J2000)  = 08h 59m 27.45s
   Dec(J2000) = +02d 43' 02.7"
```
with an uncertainty of 2.2 arcseconds (radius, 90% containment). This location is 79 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. No spectrum from the promptly downlinked event data is yet available to determine the column density.
The initial flux in the 2.5 s image was 6.70e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 393 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.05.
Burst Advocate for this burst is B.-B. Zhang (bbzhang AT psu.edu). 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 Circular #16050
Owen Littlejohns (ASU), Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (ORAU/GSFC), Eleonora Troja (GSFC), 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), and Harvey Moseley (GSFC) report:
We observed the field of GRB 140331A (Zhang, et al., GCN 16049) 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 2014/03 31.26 to 2014/03 31.32 UTC (0.35 to 1.87 hours after the BAT trigger), obtaining a total of 1.04 hours exposure in the r and i bands and 0.44 hours exposure in the Z, Y, J, and H bands.
For a source within the Swift-XRT error circle, in comparison with the SDSS DR9 and 2MASS, we obtain the following detections:
```
  r     22.02 +/- 0.11
  i     20.79 +/- 0.04
  Z     20.14 +/- 0.06
  Y     19.81 +/- 0.07
  J     19.75 +/- 0.08
  H     19.76 +/- 0.12
```
These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. This position coincides with a previously detected source, SDSS J085927.51+024304.0. We note that our r, i and Z band magnitudes are broadly consistent with those of the SDSS.
Fitting Milky Way, LMC and SMC extinction laws in addition to the IGM (see Littlejohns, et al. 2014) we find the source is possibly of high redshift, with a photometric redshift of z =3D 4.65 (+0.34,-2.80; 90% conf.). The large lower limit in the confidence region is due to a potential solution with a high quantity of Milky Way type dust.
We thank the staff of the Observatorio Astron=F3mico Nacional in San Pedro M=E1rtir.
GCN Circular #16052
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 4193 s of XRT Photon Counting mode data and 7 UVOT images for GRB 140331A, 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 = 134.86440, +2.71729 which is equivalent to:
```
RA (J2000): 08h 59m 27.46s
Dec (J2000): +02d 43' 02.3"
```
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 #16053
D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of MITSuME collaboration:
We observed the field of GRB 140331A (Zhang et al., GCNC 16049) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory.
The observation started on 2014-03-31 10:40:24 UT (~4.8 h after the burst). We could not detect the previously reported afterglow (Littlejohns et al., GCNC 16050) in all the three bands.
Three sigma upper limits of the OT are listed below. We used SDSS-DR7 catalog for flux calibration.
```
#T0+[day]  MID-UT    T-EXP[sec]   g'     Rc     Ic
-----------------------------------------------------
0.21730    11:02:43    2040.0   >19.6  >19.7  >18.7
-----------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
```
GCN Circular #16057
A. Klotz, D. Turpin (IRAP-CNRS-OMP), D. Macpherson (UWA/ICRAR), D. Coward (UWA), M. Boer, B. Gendre, K. Siellez, H. Dereli, O. Bardho (UNS-CNRS-OCA), A. Williams (PO-UWA), R. Martin (PO-UWA) report:
We imaged the field of GRB 140331A detected by SWIFT (trigger 594081) with the Zadko robotic telescope (D=100cm) located at the observatory - Gingin, Australia.
The observations started 8.26h after the GRB trigger. The elevation of the field was at 50 degrees above horizon and weather conditions were good.
We co-added two series of unfiltered exposures. They show clearly the presence of the object reported by Littlejohns et al. (GCNC 16050) that coincides with SDSS J085927.51+024304.0:
```
=start=  =end=  Rmag
  8.26h   8.68h  20.1 +/- 0.3
  9.74h  10.43h  20.1 +/- 0.3
```
The magnitude remains constant during our observation and is compatible with the magnitude found in visible bands by Littlejohns et al. (GCNC 16050) with RATIR less than two hours after the trigger. This suggests that the optical object is probably not the afterglow of GRB 130331A.
Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.
GCN Circular #16061
M. H. Siegel (PSU) and B.-B. Zhang (UAH) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 140331A 394 s after the BAT trigger (Zhang et al., GCN Circ. 16049). No optical afterglow consistent with either the enhanced XRT position (Beardmore et al. GCN Circ. 16052) or the RATIR detection (Littlejohns et al. GCN Circ. 16050) 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           394          543          147         >21.1
white              394         8016          764         >21.9
v                  550         7092          568         >19.7
b                  649         7912          568         >20.8
u                  624         7707          568         >21.1
w1                 600         7502          563         >21.1
m2                 575         7297          529         >20.5
w2                 700         6887          352         >21.4
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.05 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #16063
M. Stamatikos (OSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), J. Tueller (GSFC), T. N. Ukwatta (MSU), B.-B. Zhang (UAH) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+827 sec from recent telemetry downlinks, we report further analysis of BAT GRB 140331A (trigger #594081) (Zhang, et al., GCN Circ. 16049). The BAT ground-calculated position is RA, Dec = 134.860, 2.755 deg, which is
```
   RA(J2000)  =  08h 59m 26.4s 
   Dec(J2000) = +02d 45' 19.5" 
```
with an uncertainty of 3.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 98%.
The mask-weighted light curve shows a long weak peak starting at ~T+70 sec and ending at around T+350 sec. T90 (15-350 keV) is 209 +- 33 sec (estimated error including systematics).
The time-averaged spectrum from T87.28to T+321.14 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.01 +- 0.29. The fluence in the 15-150 keV band is 6.7 +- 1.3 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+292.49 sec in the 15-150 keV band is 0.31 +- 0.13 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/594081/BA/
GCN Circular #16065
P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), D.N. Burrows (PSU), J.A. Kennea (PSU), V. Mangano (PSU), P.A. Evans (U. Leicester), B.P. Gompertz (U. Leicester), J.P. Osborne (U. Leicester), A. Maselli (INAF-IASFPA) and B.-B. Zhang report on behalf of the Swift-XRT team:
We have analysed 8.0 ks of XRT data for GRB 140331A (-B. Zhang et al. GCN Circ. 16049), from 374 s to 42.6 ks after the BAT trigger. The data comprise 118 s in Windowed Timing (WT) mode (the first 9 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. 16052).
The light curve can be modelled with an initial power-law decay with an index of alpha=3.57 (+0.22, -0.19), followed by a break at T+1389 s to an alpha of 0.69 (+/-0.09).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.97 (+0.13, -0.12). The best-fitting absorption column is 6.3 (+2.9, -2.0) x 10^20 cm^-2, consistent with the Galactic value of 4.4 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.90 (+0.16, -0.11) and a best-fitting absorption column of 4.8 (+3.7, -0.4) x 10^20 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.4 x 10^-11 (3.8 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     4.8 (+3.7, -0.4) x 10^20 cm^-2
Galactic foreground: 4.4 x 10^20 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.90 (+0.16, -0.11)
```
If the light curve continues to decay with a power-law decay index of 0.69, the count rate at T+24 hours will be 0.011 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.8 x 10^-13 (4.2 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00594081.
This circular is an official product of the Swift-XRT team.
GCN Circular #16076
Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (ORAU/GSFC), 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), and Harvey Moseley (GSFC) report:
We again observed the field of GRB 140331A (Zhang, et al., GCN 16049) 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 first from 2014/04 1.13 to 2014/04 1.37 UTC (21.27 to 27.13 hours after the BAT trigger), obtaining a total of 3.50 hours exposure in the r and i bands and 1.46 hours exposure in the Z, Y, J, and H bands and then from 2014/04 3.18 to 2014/04 3.36 UTC (70.39 to 74.71 hours after the BAT trigger), obtaining a total of 2.56 hours exposure in the r and i bands and 1.07 hours exposure in the Z, Y, J, and H bands.
We do not detect statistically significant flux variation for the source reported by Littlejohns et al. (2014, GCN 16050), which was also noted to be coincident with an SDSS galaxy at z~0.7. We, therefore, conclude that this source is not the GRB afterglow (see, also, Klotz et al. 2014, GCN 6057).
We can utilize the observations reported here to estimate the limiting magnitudes for the GRB during our first night of observations (mean time ~1 hr after the GRB). For a source within the Swift-XRT error circle (Beardmore et al. 2014, GCN 16052) , in comparison with the SDSS DR9 and 2MASS, we obtain the following (3-sigma) upper limits:
```
 r > 23.5
 i > 23.2
 Z > 21.3
 Y > 21.3
 J > 21.2
 H > 21.0
```
These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. The r-band limit implies a very faint or reddened afterglow. Our r-band limit relative to the X-ray flux at the same epoch (e.g., D'Avanzo et al. 2014, GCN 16065) implies a broadband spectral index beta_OX<0.3 (3-sigma), which is significantly lower than the standard cuttoff (beta_OX<0.5) defining optically-dark GRB= s (e.g, Jakobsson et al. 2004).
We thank the staff of the Observatorio Astron=F3mico Nacional in San Pedro M=E1rtir.

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Jochen Greiner, last update: 03-Apr-2014 [Disclaimer]