Gamma-ray Burst 140408A

(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:     Tue 08 Apr 14 13:16:28 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     595141,   Seg_Num: 0
GRB_RA:          290.685d {+19h 22m 44s} (J2000),
                 290.884d {+19h 23m 32s} (current),
                 289.986d {+19h 19m 57s} (1950)
GRB_DEC:         -12.578d {-12d 34' 40"} (J2000),
                 -12.550d {-12d 32' 59"} (current),
                 -12.675d {-12d 40' 28"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       11659 [cnts]    Image_Peak=271 [image_cnts]
TRIGGER_DUR:     2.048 [sec] 
TRIGGER_INDEX:   473     E_range: 25-100 keV
BKG_INTEN:       117942 [cnts]
BKG_TIME:        47724.13 SOD {13:15:24.13} UT
BKG_DUR:         24 [sec]
GRB_DATE:        16755 TJD;    98 DOY;   14/04/08
GRB_TIME:        47754.79 SOD {13:15:54.79} UT
GRB_PHI:         -142.35 [deg]
GRB_THETA:        40.30 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     11.70 [sigma]
IMAGE_SIGNIF:    7.83 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +2  -2  +0  +0  -3  +0 
SUN_POSTN:        17.19d {+01h 08m 45s}   +7.30d {+07d 17' 59"}
SUN_DIST:         88.01 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      122.70d {+08h 10m 49s}  +14.64d {+14d 38' 25"}
MOON_DIST:       168.32 [deg]
MOON_ILLUM:      61 [%]
GAL_COORDS:       25.09,-12.57 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      290.45,  9.40 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 275.22,-10.37 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(1.0<100sec) coincident with the FERMI_GBM event (trignum=418655758).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 08 Apr 14 13:16:19 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     418655758
GRB_RA:          289.100d {+19h 16m 24s} (J2000),
                 289.301d {+19h 17m 12s} (current),
                 288.396d {+19h 13m 35s} (1950)
GRB_DEC:         -13.583d {-13d 34' 59"} (J2000),
                 -13.557d {-13d 33' 25"} (current),
                 -13.673d {-13d 40' 21"} (1950)
GRB_ERROR:       18.88 [deg radius, statistical plus systematic]
GRB_INTEN:       90 [cnts/sec]
DATA_SIGNIF:     5.80 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        16755 TJD;    98 DOY;   14/04/08
GRB_TIME:        47755.24 SOD {13:15:55.24} UT
GRB_PHI:         270.00 [deg]
GRB_THETA:        90.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      1.43
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      94%  GRB
2nd_MOST_LIKELY:   4%  SGR_1806n20
DETECTORS:       0,0,0, 0,1,0, 0,0,1, 0,0,0, 0,0,
SUN_POSTN:        17.19d {+01h 08m 45s}   +7.30d {+07d 17' 59"}
SUN_DIST:         89.67 [deg]   Sun_angle= 5.9 [hr] (West of Sun)
MOON_POSTN:      122.70d {+08h 10m 49s}  +14.64d {+14d 38' 26"}
MOON_DIST:       166.96 [deg]
MOON_ILLUM:      61 [%]
GAL_COORDS:       23.48,-11.60 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      288.77,  8.62 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 149.10,0.03 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 08 Apr 14 13:16:52 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     418655758
GRB_RA:          282.600d {+18h 50m 24s} (J2000),
                 282.800d {+18h 51m 12s} (current),
                 281.897d {+18h 47m 35s} (1950)
GRB_DEC:         -12.820d {-12d 49' 11"} (J2000),
                 -12.803d {-12d 48' 08"} (current),
                 -12.879d {-12d 52' 44"} (1950)
GRB_ERROR:       5.00 [deg radius, statistical only]
DATA_SIGNIF:     7.40 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        16755 TJD;    98 DOY;   14/04/08
GRB_TIME:        47755.24 SOD {13:15:55.24} UT
GRB_PHI:         266.00 [deg]
GRB_THETA:        85.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:        17.19d {+01h 08m 45s}   +7.30d {+07d 17' 59"}
SUN_DIST:         95.86 [deg]   Sun_angle= 6.3 [hr] (West of Sun)
MOON_POSTN:      122.71d {+08h 10m 50s}  +14.64d {+14d 38' 22"}
MOON_DIST:       160.58 [deg]
MOON_ILLUM:      61 [%]
GAL_COORDS:       21.37, -5.58 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      282.48, 10.08 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(1.0<100sec) coincident with the SWIFT_BAT event (trignum=595141).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Apr 14 13:17:46 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     595141,   Seg_Num: 0
POINT_RA:        290.680d {+19h 22m 43s} (J2000)
POINT_DEC:       -12.578d {-12d 34' 40"} (J2000)
IMG_START_DATE:  16755 TJD;    98 DOY;   14/04/08
IMG_START_TIME:  47860.25 SOD {13:17:40.25} UT,   105.5 [sec] since BAT Trigger Time
COUNTS:          17    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        4    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 08 Apr 14 13:19:47 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     595141,   Seg_Num: 0
GRB_RA:          290.685d {+19h 22m 44s} (J2000),
                 290.884d {+19h 23m 32s} (current),
                 289.986d {+19h 19m 57s} (1950)
GRB_DEC:         -12.578d {-12d 34' 40"} (J2000),
                 -12.550d {-12d 32' 59"} (current),
                 -12.675d {-12d 40' 28"} (1950)
GRB_DATE:        16755 TJD;    98 DOY;   14/04/08
GRB_TIME:        47754.79 SOD {13:15:54.79} UT
TRIGGER_INDEX:   473
GRB_PHI:         -142.35 [deg]
GRB_THETA:        40.30 [deg]
DELTA_TIME:      -24.00 [sec]
TRIGGER_DUR:     2.048 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     11.70 [sigma]
IMAGE_SIGNIF:    7.83 [sigma]
LC_URL:          sw00595141000msb.lc
SUN_POSTN:        17.19d {+01h 08m 46s}   +7.30d {+07d 18' 02"}
SUN_DIST:         88.01 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      122.73d {+08h 10m 56s}  +14.63d {+14d 38' 04"}
MOON_DIST:       168.30 [deg]
MOON_ILLUM:      61 [%]
GAL_COORDS:       25.09,-12.57 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      290.45,  9.40 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 275.22,-10.37 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Apr 14 13:21:32 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     595141,   Seg_Num: 0
POINT_RA:        290.680d {+19h 22m 43s} (J2000)
POINT_DEC:       -12.579d {-12d 34' 42"} (J2000)
POINT_ROLL:      82.106d
IMG_START_DATE:  16755 TJD;    98 DOY;   14/04/08
IMG_START_TIME:  47863.81 SOD {13:17:43.81} UT,   109.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.523
N_STARS:         190
X_OFFSET:        519 [pixels]
Y_OFFSET:        521 [pixels]
X_MAX:           1478 [pixels]
Y_MAX:           1480 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00595141000msufc0109.fits
SUN_POSTN:        17.19d {+01h 08m 46s}   +7.30d {+07d 18' 03"}
SUN_DIST:         88.01 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      122.75d {+08h 10m 59s}  +14.63d {+14d 37' 53"}
MOON_DIST:       168.28 [deg]
MOON_ILLUM:      61 [%]
GAL_COORDS:       25.08,-12.56 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      290.45,  9.40 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Apr 14 13:22:01 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     595141,   Seg_Num: 0
POINT_RA:        290.680d {+19h 22m 43s} (J2000)
POINT_DEC:       -12.579d {-12d 34' 42"} (J2000)
POINT_ROLL:      82.106d
IMG_START_DATE:  16755 TJD;    98 DOY;   14/04/08
IMG_START_TIME:  47863.81 SOD {13:17:43.81} UT,   109.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.523
N_STARS:         190
X_OFFSET:        519 [pixels]
Y_OFFSET:        521 [pixels]
X_MAX:           1478 [pixels]
Y_MAX:           1480 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00595141000msufc0109.fits
SUN_POSTN:        17.19d {+01h 08m 46s}   +7.30d {+07d 18' 04"}
SUN_DIST:         88.01 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      122.75d {+08h 11m 00s}  +14.63d {+14d 37' 50"}
MOON_DIST:       168.28 [deg]
MOON_ILLUM:      61 [%]
GAL_COORDS:       25.08,-12.56 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      290.45,  9.40 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Apr 14 13:23:06 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     595141,   Seg_Num: 0
POINT_RA:        290.680d {+19h 22m 43s} (J2000)
POINT_DEC:       -12.579d {-12d 34' 42"} (J2000)
ROLL:            82.106d
IMG_START_DATE:  16755 TJD;    98 DOY;   14/04/08
IMG_START_TIME:  47863.81 SOD {13:17:43.81} UT,   109.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     418655875
X_OFFSET:        838 [pixels]
Y_OFFSET:        840 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       998
Y_GRB_POS:       1000
BINNING_INDEX:   1
IM_URL:          sw00595141000msuni0121.fits
SUN_POSTN:        17.19d {+01h 08m 46s}   +7.30d {+07d 18' 05"}
SUN_DIST:         88.02 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      122.76d {+08h 11m 02s}  +14.63d {+14d 37' 43"}
MOON_DIST:       168.27 [deg]
MOON_ILLUM:      61 [%]
GAL_COORDS:       25.08,-12.56 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      290.45,  9.40 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Apr 14 13:23:26 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     595141,   Seg_Num: 0
POINT_RA:        290.680d {+19h 22m 43s} (J2000)
POINT_DEC:       -12.579d {-12d 34' 42"} (J2000)
ROLL:            82.106d
IMG_START_DATE:  16755 TJD;    98 DOY;   14/04/08
IMG_START_TIME:  47863.81 SOD {13:17:43.81} UT,   109.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     418655875
X_OFFSET:        838 [pixels]
Y_OFFSET:        840 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       998
Y_GRB_POS:       1000
BINNING_INDEX:   1
IM_URL:          sw00595141000msuni0121.fits
SUN_POSTN:        17.19d {+01h 08m 46s}   +7.30d {+07d 18' 05"}
SUN_DIST:         88.02 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      122.76d {+08h 11m 03s}  +14.63d {+14d 37' 41"}
MOON_DIST:       168.27 [deg]
MOON_ILLUM:      61 [%]
GAL_COORDS:       25.08,-12.56 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      290.45,  9.40 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Apr 14 13:28:49 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     595141,   Seg_Num: 0
POINT_RA:        290.677d {+19h 22m 43s} (J2000)
POINT_DEC:       -12.580d {-12d 34' 48"} (J2000)
POINT_ROLL:      82.108d
IMG_START_DATE:  16755 TJD;    98 DOY;   14/04/08
IMG_START_TIME:  48076.04 SOD {13:21:16.04} UT,   321.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.861
N_STARS:         190
X_OFFSET:        279 [pixels]
Y_OFFSET:        281 [pixels]
X_MAX:           1718 [pixels]
Y_MAX:           1720 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00595141000msufc0321.fits
SUN_POSTN:        17.20d {+01h 08m 47s}   +7.30d {+07d 18' 10"}
SUN_DIST:         88.02 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      122.81d {+08h 11m 14s}  +14.62d {+14d 37' 08"}
MOON_DIST:       168.22 [deg]
MOON_ILLUM:      61 [%]
GAL_COORDS:       25.08,-12.56 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      290.45,  9.40 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Apr 14 13:29:20 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     595141,   Seg_Num: 0
POINT_RA:        290.677d {+19h 22m 43s} (J2000)
POINT_DEC:       -12.580d {-12d 34' 48"} (J2000)
POINT_ROLL:      82.108d
IMG_START_DATE:  16755 TJD;    98 DOY;   14/04/08
IMG_START_TIME:  48076.04 SOD {13:21:16.04} UT,   321.2 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.861
N_STARS:         190
X_OFFSET:        279 [pixels]
Y_OFFSET:        281 [pixels]
X_MAX:           1718 [pixels]
Y_MAX:           1720 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00595141000msufc0321.fits
SUN_POSTN:        17.20d {+01h 08m 47s}   +7.30d {+07d 18' 11"}
SUN_DIST:         88.02 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      122.81d {+08h 11m 15s}  +14.62d {+14d 37' 04"}
MOON_DIST:       168.22 [deg]
MOON_ILLUM:      61 [%]
GAL_COORDS:       25.08,-12.56 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      290.45,  9.40 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Apr 14 13:30:11 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     595141,   Seg_Num: 0
GRB_RA:          290.7157d {+19h 22m 51.76s} (J2000),
                 290.9151d {+19h 23m 39.61s} (current),
                 290.0166d {+19h 20m 03.99s} (1950)
GRB_DEC:         -12.5937d {-12d 35' 37.3"} (J2000),
                 -12.5655d {-12d 33' 55.7"} (current),
                 -12.6906d {-12d 41' 26.1"} (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:  16755 TJD;    98 DOY;   14/04/08
IMG_START_TIME:  48153.00 SOD {13:22:33.00} UT,   398.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        17.20d {+01h 08m 47s}   +7.30d {+07d 18' 12"}
SUN_DIST:         87.99 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      122.82d {+08h 11m 16s}  +14.62d {+14d 36' 59"}
MOON_DIST:       168.25 [deg]
MOON_ILLUM:      61 [%]
GAL_COORDS:       25.09,-12.60 [deg] galactic lon,lat of the burst
ECL_COORDS:      290.48,  9.38 [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 1.1% < P(seren) < 2.8%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Apr 14 13:30:15 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     595141,   Seg_Num: 0
POINT_RA:        290.677d {+19h 22m 43s} (J2000)
POINT_DEC:       -12.580d {-12d 34' 48"} (J2000)
ROLL:            82.108d
IMG_START_DATE:  16755 TJD;    98 DOY;   14/04/08
IMG_START_TIME:  48076.04 SOD {13:21:16.04} UT,   321.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     418656087
X_OFFSET:        838 [pixels]
Y_OFFSET:        840 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       998
Y_GRB_POS:       1000
BINNING_INDEX:   1
IM_URL:          sw00595141000msuni0333.fits
SUN_POSTN:        17.20d {+01h 08m 47s}   +7.30d {+07d 18' 12"}
SUN_DIST:         88.02 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      122.82d {+08h 11m 17s}  +14.62d {+14d 36' 59"}
MOON_DIST:       168.21 [deg]
MOON_ILLUM:      61 [%]
GAL_COORDS:       25.08,-12.56 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      290.45,  9.40 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Apr 14 13:30:42 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     595141,   Seg_Num: 0
POINT_RA:        290.677d {+19h 22m 43s} (J2000)
POINT_DEC:       -12.580d {-12d 34' 48"} (J2000)
ROLL:            82.108d
IMG_START_DATE:  16755 TJD;    98 DOY;   14/04/08
IMG_START_TIME:  48076.04 SOD {13:21:16.04} UT,   321.2 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     418656087
X_OFFSET:        838 [pixels]
Y_OFFSET:        840 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       998
Y_GRB_POS:       1000
BINNING_INDEX:   1
IM_URL:          sw00595141000msuni0333.fits
SUN_POSTN:        17.20d {+01h 08m 47s}   +7.30d {+07d 18' 12"}
SUN_DIST:         88.02 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      122.82d {+08h 11m 17s}  +14.62d {+14d 36' 56"}
MOON_DIST:       168.21 [deg]
MOON_ILLUM:      61 [%]
GAL_COORDS:       25.08,-12.56 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      290.45,  9.40 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Apr 14 13:35:09 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     595141,   Seg_Num: 0
POINT_RA:        290.677d {+19h 22m 42s} (J2000)
POINT_DEC:       -12.580d {-12d 34' 48"} (J2000)
POINT_ROLL:      82.107d
IMG_START_DATE:  16755 TJD;    98 DOY;   14/04/08
IMG_START_TIME:  48629.60 SOD {13:30:29.60} UT,   874.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.397
N_STARS:         190
X_OFFSET:        279 [pixels]
Y_OFFSET:        281 [pixels]
X_MAX:           1718 [pixels]
Y_MAX:           1720 [pixels]
DET_THRESH:      24
PHOTO_THRESH:    14
SL_URL:          sw00595141000msufc0874.fits
SUN_POSTN:        17.20d {+01h 08m 48s}   +7.30d {+07d 18' 16"}
SUN_DIST:         88.03 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      122.86d {+08h 11m 26s}  +14.61d {+14d 36' 28"}
MOON_DIST:       168.17 [deg]
MOON_ILLUM:      61 [%]
GAL_COORDS:       25.08,-12.56 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      290.45,  9.40 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Apr 14 13:35:16 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     595141,   Seg_Num: 0
POINT_RA:        290.677d {+19h 22m 42s} (J2000)
POINT_DEC:       -12.580d {-12d 34' 48"} (J2000)
POINT_ROLL:      82.107d
IMG_START_DATE:  16755 TJD;    98 DOY;   14/04/08
IMG_START_TIME:  48629.60 SOD {13:30:29.60} UT,   874.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.397
N_STARS:         190
X_OFFSET:        279 [pixels]
Y_OFFSET:        281 [pixels]
X_MAX:           1718 [pixels]
Y_MAX:           1720 [pixels]
DET_THRESH:      24
PHOTO_THRESH:    14
SL_URL:          sw00595141000msufc0874.fits
SUN_POSTN:        17.20d {+01h 08m 48s}   +7.30d {+07d 18' 16"}
SUN_DIST:         88.03 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      122.86d {+08h 11m 26s}  +14.61d {+14d 36' 27"}
MOON_DIST:       168.17 [deg]
MOON_ILLUM:      61 [%]
GAL_COORDS:       25.08,-12.56 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      290.45,  9.40 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Apr 14 13:36:07 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     595141,   Seg_Num: 0
GRB_RA:          290.7162d {+19h 22m 51.88s} (J2000),
                 290.9156d {+19h 23m 39.73s} (current),
                 290.0171d {+19h 20m 04.11s} (1950)
GRB_DEC:         -12.5955d {-12d 35' 43.7"} (J2000),
                 -12.5673d {-12d 34' 02.1"} (current),
                 -12.6924d {-12d 41' 32.6"} (1950)
GRB_ERROR:       2.5 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16755 TJD;    98 DOY;   14/04/08
IMG_START_TIME:  48153.00 SOD {13:22:33.00} UT,   398.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        17.20d {+01h 08m 48s}   +7.30d {+07d 18' 17"}
SUN_DIST:         87.99 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      122.87d {+08h 11m 28s}  +14.61d {+14d 36' 22"}
MOON_DIST:       168.21 [deg]
MOON_ILLUM:      61 [%]
GAL_COORDS:       25.08,-12.60 [deg] galactic lon,lat of the burst
ECL_COORDS:      290.48,  9.38 [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 1.1% < P(seren) < 2.8%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Apr 14 13:37:27 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     595141,   Seg_Num: 0
POINT_RA:        290.677d {+19h 22m 42s} (J2000)
POINT_DEC:       -12.580d {-12d 34' 48"} (J2000)
ROLL:            82.107d
IMG_START_DATE:  16755 TJD;    98 DOY;   14/04/08
IMG_START_TIME:  48629.60 SOD {13:30:29.60} UT,   874.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     418656641
X_OFFSET:        838 [pixels]
Y_OFFSET:        840 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       998
Y_GRB_POS:       1000
BINNING_INDEX:   1
IM_URL:          sw00595141000msuni0886.fits
SUN_POSTN:        17.20d {+01h 08m 48s}   +7.31d {+07d 18' 18"}
SUN_DIST:         88.03 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      122.88d {+08h 11m 31s}  +14.60d {+14d 36' 14"}
MOON_DIST:       168.16 [deg]
MOON_ILLUM:      61 [%]
GAL_COORDS:       25.08,-12.56 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      290.45,  9.40 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 08 Apr 14 13:37:45 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     595141,   Seg_Num: 0
POINT_RA:        290.677d {+19h 22m 42s} (J2000)
POINT_DEC:       -12.580d {-12d 34' 48"} (J2000)
ROLL:            82.107d
IMG_START_DATE:  16755 TJD;    98 DOY;   14/04/08
IMG_START_TIME:  48629.60 SOD {13:30:29.60} UT,   874.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     418656641
X_OFFSET:        838 [pixels]
Y_OFFSET:        840 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       998
Y_GRB_POS:       1000
BINNING_INDEX:   1
IM_URL:          sw00595141000msuni0886.fits
SUN_POSTN:        17.20d {+01h 08m 48s}   +7.31d {+07d 18' 19"}
SUN_DIST:         88.03 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      122.88d {+08h 11m 31s}  +14.60d {+14d 36' 12"}
MOON_DIST:       168.15 [deg]
MOON_ILLUM:      61 [%]
GAL_COORDS:       25.08,-12.56 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      290.45,  9.40 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #16082
V. D'Elia (ASDC), D. N. Burrows (PSU), N. Gehrels (NASA/GSFC), S. T. Holland (STScI), L. Izzo (URoma/ICRA), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), A. Y. Lien (NASA/GSFC/ORAU), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), B. Sbarufatti (INAF-OAB/PSU), M. H. Siegel (PSU), R. L. C. Starling (U Leicester) and C. A. Swenson (PSU) report on behalf of the Swift Team:
At 13:15:54 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 140408A (trigger=595141). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 290.685, -12.578 which is
```
   RA(J2000)  =  19h 22m 44s
   Dec(J2000) = -12d 34' 40"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single peak with a duration of about 10 sec. The peak count rate was ~2000 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began observing the field at 13:17:40.2 UT, 105.5 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 290.71576, -12.59373 which is equivalent to:
```
   RA(J2000)  = 19h 22m 51.78s
   Dec(J2000) = -12d 35' 37.4"
```
with an uncertainty of 4.1 arcseconds (radius, 90% containment). This location is 122 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.
UVOT took a finding chart exposure of 150 seconds with the White filter starting 109 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers none of the XRT error circle. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. Because of the density of catalogued stars, further analysis is required to report an upper limit for any afterglow in the region. No correction has been made for the expected extinction corresponding to E(B-V) of 0.19.
Burst Advocate for this burst is V. D'Elia (delia AT asdc.asi.it). 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 #16084
P. Jenke (UAH), G. Fitzpatrick (UCD) reports on behalf of the Fermi GBM Team:
"At 13:15:55.24 UT on April 8 2014, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 140408A (trigger 418655758/140408553), which was also detected by Swift (V. D'Elia et al. 2014, GCN 16082). The GBM on-ground location, using the Fermi GBM trigger data, is consistent with the Swift/BAT location.
The angle of the burst direction to the Fermi LAT boresight is 90 degrees.
The GBM light curve consists of one main peak with a duration (T90) of about 13 s (50-300 keV). The time-averaged spectrum from T0-4.1 s to T0+10.2s is well fit by a power law with an index of -1.61 +/- 0.07.
The event fluence (10-1000 keV) in this time interval is (1.8 +/- 0.2)E-06 erg/cm^2. The 1.0-sec peak photon flux measured starting from T0+0.0 s in the 10-1000 keV band is 2.0 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #16085
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 661 s of XRT Photon Counting mode data and 1 UVOT images for GRB 140408A, 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 = 290.71590, -12.59525 which is equivalent to:
```
RA (J2000): 19h 22m 51.82s
Dec (J2000): -12d 35' 42.9"
```
with an uncertainty of 2.1 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 #16086
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 140408A (D'Elia et al., GCNC 16082) 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 2014-04-08 17:47:44 UT (~4.5 h after the burst). We did not find any new point source within the enhanced XRT circle (Evans et al., GCNC 16085) in all the three bands.
Three sigma upper limits of the OT are listed below. We used GSC2.3 catalog for flux calibration.
```
#T0+[day]  MID-UT    T-EXP[sec]   g'     Rc     Ic
-----------------------------------------------------
0.21515    18:25:43    4200.0   >19.1  >18.9  >18.3
-----------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
```
GCN Circular #16087
J.A. Kennea (PSU), V. Mangano (PSU), M.C. Stroh (PSU), B.P. Gompertz (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A. Maselli (INAF-IASFPA), A. Melandri (INAF-OAB) and V. D'Elia report on behalf of the Swift-XRT team:
We have analysed 8.7 ks of XRT data for GRB 140408A (D'Elia et al. GCN Circ. 16082), from 91 s to 29.8 ks after the BAT trigger. The data comprise 268 s in Windowed Timing (WT) mode (the first 8 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN Circ. 16085).
The light curve can be modelled with a power-law decay with a decay index of alpha=0.77 (+0.10, -0.09).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2 (+80, -1). The best-fitting absorption column is 1.4 (+7.3, -1.2) x 10^22 cm^-2, consistent with the Galactic value of 1.8 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 1.5 x 10^-11 (6.9 x 10^-11) erg cm^-2 count^-1.
A summary of the WT-mode spectrum is thus:
```
Total column:	     1.4 (+7.3, -1.2) x 10^22 cm^-2
Galactic foreground: 1.8 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     2 (+80, -1)
```
If the light curve continues to decay with a power-law decay index of 0.77, the count rate at T+24 hours will be 2.1 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.1 x 10^-14 (1.5 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/00595141.
This circular is an official product of the Swift-XRT team.
GCN Circular #16088
N. P. M. Kuin (UCL-MSSL) and V. D'Elia (ASDC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 140408A 109 s after the BAT trigger (D'Elia et al., GCN Circ. 16082). No optical afterglow consistent with the XRT position (Evans et al., GCN Circ. 16085,) and with the non-detection reported by Kuroda et al. (GCN Circ. 16086), 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           109          259          147         >20.9
u_FC               321          571          246         >20.5
white              109         1025          334         >21.2
v                  652         4403          236         >20.0
b                  577          769           39         >18.7
u                  321          745          265         >20.5
w1                 701          720           19         >18.1
m2                 676         4572          201         >19.9
w2                 627         1046           54         >20.2
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.19 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #16089
GRB 140408A: GROND Detection of an Afterglow Candidate
K. Varela, C. Delvaux (both MPE Garching), D.A. Kann (TLS Tautenburg), and J. Greiner (MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 140408A (Swift trigger 595141; d'Elia et al., GCN #16082) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at La Silla Observatory (Chile).
Observations started at 06:16:31 UT on 9th April 2014, 0.709 days after the GRB trigger. They were performed at an average seeing of 0".9 and at an average airmass of 1.6.
We find a single point source within the 2".2 Swift-XRT error circle reported by Evans et al. (GCN #16085) at
```
RA (J2000.0) = 19h 22m 51.78s  
Dec. (J2000.0) = 12d 35' 40.9" 
```
with an uncertainty of 0".4 in each coordinate.
Based on a 7380 s exposure on g'r'i'z' , and a 6000 s exposure in JHK, we estimate preliminary magnitudes (all in AB system) of
```
g' = 25.6 +- 0.3 mag,
r' = 23.7 +- 0.2 mag,
i' = 22.7 +- 0.2 mag,
z' = 22.8 +- 0.3 mag,
J > 22.0 mag,
H > 21.5 mag, and
K > 20.0 mag.
```
We propose this source to be a candidate afterglow for GRB 140408A. At the moment, fading can not be established. If it is the afterglow, the SED suggests a redshift of z ~ 4.
Given magnitudes are calibrated against GROND zeropoints as well as 2MASS field stars and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.16 mag in the direction of the burst (Schlafly & Finkbeiner 2011).

PS: In the original GCN, the data was inadvertedly given wrongly as April 8 - this has been corrected above. Thanks to N. Bhat for the notification.
GCN Circular #16090
T. N. Ukwatta (MSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), V. D'Elia (ASDC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), (i.e. the Swift-BAT team):
Using the data set from T-180 to T+902 sec from the recent telemetry downlink, we report further analysis of BAT GRB 140408A (trigger #595141) (D'Elia, et al., GCN Circ. 16082). The BAT ground-calculated position is RA, Dec = 290.723, -12.585 deg which is
```
   RA(J2000)  =  19h 22m 53.5s
   Dec(J2000) = -12d 35' 07.7"
```
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 40%.
The mask-weighted light curve shows a single-pulse structure starts at ~T-1 sec, peaks at ~ T+1 sec, and ends at ~T+4 sec. T90 (15-350 keV) is 4.00 +- 1.41 sec (estimated error including systematics).
The time-averaged spectrum from T-0.66 to T+3.34 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.49 +- 0.25. The fluence in the 15-150 keV band is 3.1 +- 0.5 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.34 sec in the 15-150 keV band is 1.2 +- 0.3 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/595141/BA/
GCN Circular #16091
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=F1= iga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report:
We observed the field of GRB 140408A (D'Elia, et al., GCN 16082) 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 2014/04 9.41 to 2014/04 9.48 UTC (20.52 to 22.37 hours after the BAT trigger), obtaining a total of 1.42 hours exposure in the r and i bands.
For a source within the Swift-XRT error circle we obtain the following upper limits (3-sigma):
```
  r     > 22.84
  i     > 22.53
```
These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. These upper limits are consistent with the previously reported GROND afterglow candidate (Varela, et al., GCN 16089).
We thank the staff of the Observatorio Astron=F3mico Nacional in San Pedro M=E1rtir.
GCN Circular #16093
H. Ohuchi, T. Yoshii, Y. Saito, Y. Tachibana, S. Kurita, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 140408A (V. D'Elia et al., GCN Circular #16082) with the optical three color (g, Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan.
The observation started on 2014-04-08 17:03:08.6 UT ( 3.8h after the burst). We did not find any new point source within the enhanced XRT circle (Evans et al., GCNC 16085) in all the three bands. The measured magnitudes were listed below.
```
T0+[sec]    MID-UT    T-EXP[sec]    g'         Rc         Ic
$B!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=(B-
17105     18:00:59     6300        >20.1    >19.6     >19.1
$B!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=(B-
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used GSC2.3 catalog for flux calibration.
```
GCN Circular #16096
S. Jeong, S. R. Oates, J. C. Tello, J. Gorosabel, A. Sota and A. J. Castro-Tirado (IAA-CSIC), on behalf of a larger collaboration, report:
"Following the detection of GRB140408A by Swift (D'Elia et al., GCNC 16082), we observed the field of GRB 140408A with the 1.5 m OSN telescope at Observatorio de Sierra Nevada in the R and I-bands. The observation started on Apr 9, 04:01:16 UT (i.e. ~0.62 d post burst). No optical afterglow is found at the position of the optical candidate reported by Varela et al. (GCNC 16089) in the median combined images (6 x 300s) down to 21.7 mag (I band) and 22.5 mag (R band) (3-sigma upper limits, with all magnitudes in Vega system and no correction for the Galaxy reddening)."
GCN Circular #16341
GRB 140408A: Withdrawal of afterglow candidate
F. Knust, K. Varela, C. Delvaux (all MPE Garching), D.A. Kann (TLS Tautenburg) and J. Greiner (MPE Garching) report on behalf of the GROND team:
We observed the GRB 140408A field again on further three epochs, simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at ESO La Silla Observatory (Chile).
The afterglow candidate reported in Varela et al. (GCN #16089) remained constant, thus this source is a fore- or background source and not the afterglow of GRB 140408A.
For the first epoch as reported in Varela et al. (GCN #16089), no other source is seen in the 1".8 Swift-XRT refined error circle (http://www.swift.ac.uk/xrt_positions/00595141/) down to limiting magnitudes (all in the AB system) of
```
g' > 25.8 mag, 
r' > 25.6 mag, 
i' > 25.0 mag, 
z' > 25.0 mag, 
J > 22.1 mag, 
H > 21.5 mag, and 
K > 20.0 mag.
```
The given limits are based on calibrating the images against GROND zeropoints and 2MASS field stars, and are not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B-V)= 0.16 in the direction of the burst (Schlegel et al. 1998).

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Jochen Greiner, last update: 30-May-2014 [Disclaimer]