Gamma-ray Burst 130505A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 05 May 13 08:22:50 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     555163,   Seg_Num: 0
GRB_RA:          137.060d {+09h 08m 14s} (J2000),
                 137.247d {+09h 08m 59s} (current),
                 136.359d {+09h 05m 26s} (1950)
GRB_DEC:         +17.485d {+17d 29' 06"} (J2000),
                 +17.431d {+17d 25' 50"} (current),
                 +17.688d {+17d 41' 16"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       28086 [cnts]    Image_Peak=147 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   155     E_range: 50-350 keV
BKG_INTEN:       17016 [cnts]
BKG_TIME:        30133.48 SOD {08:22:13.48} UT
BKG_DUR:         8 [sec]
GRB_DATE:        16417 TJD;   125 DOY;   13/05/05
GRB_TIME:        30148.39 SOD {08:22:28.39} UT
GRB_PHI:         -175.87 [deg]
GRB_THETA:        59.43 [deg]
SOLN_STATUS:     0x83
RATE_SIGNIF:     255.99 [sigma]
IMAGE_SIGNIF:    6.59 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +3  -4  +0  +0  +0  +0 
SUN_POSTN:        42.54d {+02h 50m 10s}  +16.34d {+16d 20' 13"}
SUN_DIST:         89.47 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      349.85d {+23h 19m 24s}   +0.43d {+00d 25' 44"}
MOON_DIST:       143.27 [deg]
MOON_ILLUM:      21 [%]
GAL_COORDS:      211.27, 37.89 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      134.29,  0.99 [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:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 203.17,11.37 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 05 May 13 08:24:46 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     555163,   Seg_Num: 0
GRB_RA:          137.0626d {+09h 08m 15.02s} (J2000),
                 137.2494d {+09h 09m 00.13s} (current),
                 136.3616d {+09h 05m 26.77s} (1950)
GRB_DEC:         +17.4857d {+17d 29' 08.5"} (J2000),
                 +17.4312d {+17d 25' 52.4"} (current),
                 +17.6884d {+17d 41' 18.0"} (1950)
GRB_ERROR:       4.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       7.35e-09 [erg/cm2/sec]
GRB_SIGNIF:      14.07 [sigma]
IMG_START_DATE:  16417 TJD;   125 DOY;   13/05/05
IMG_START_TIME:  30244.77 SOD {08:24:04.77} UT,   96.4 [sec] since BAT Trigger Time
TAM[0-3]:        327.67 237.20 261.57 243.78
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        42.54d {+02h 50m 11s}  +16.34d {+16d 20' 15"}
SUN_DIST:         89.47 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      349.86d {+23h 19m 28s}   +0.43d {+00d 26' 06"}
MOON_DIST:       143.26 [deg]
MOON_ILLUM:      21 [%]
GAL_COORDS:      211.27, 37.89 [deg] galactic lon,lat of the burst
ECL_COORDS:      134.30,  0.99 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.17 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:     Sun 05 May 13 08:25:10 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     555163,   Seg_Num: 0
GRB_RA:          137.0626d {+09h 08m 15.0s} (J2000),
                 137.2494d {+09h 09m 00.1s} (current),
                 136.3616d {+09h 05m 26.7s} (1950)
GRB_DEC:         +17.4857d {+17d 29' 08.5"} (J2000),
                 +17.4312d {+17d 25' 52.4"} (current),
                 +17.6884d {+17d 41' 18.0"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       198 [cnts]
IMG_START_DATE:  16417 TJD;   125 DOY;   13/05/05
IMG_START_TIME:  30244.77 SOD {08:24:04.77} UT,   96.4 [sec] since BAT Trigger Time
CENTROID_X:      305.31,  raw= 305  [pixels]
CENTROID_Y:      303.81,  raw= 304  [pixels]
ROLL:            286.92 [deg]
GAIN:            2
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   13.69
GRB_POS_XRT_Z:   3.81
IMAGE_URL:       sw00555163000msxps_rw.img
SUN_POSTN:        42.54d {+02h 50m 11s}  +16.34d {+16d 20' 15"}
SUN_DIST:         89.47 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      349.87d {+23h 19m 28s}   +0.44d {+00d 26' 10"}
MOON_DIST:       143.25 [deg]
MOON_ILLUM:      21 [%]
GAL_COORDS:      211.27, 37.89 [deg] galactic lon,lat of the burst
ECL_COORDS:      134.30,  0.99 [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:     Sun 05 May 13 08:24:57 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     555163,   Seg_Num: 0
GRB_RA:          137.0626d {+09h 08m 15.0s} (J2000),
                 137.2494d {+09h 09m 00.1s} (current),
                 136.3616d {+09h 05m 26.7s} (1950)
GRB_DEC:         +17.4857d {+17d 29' 08.5"} (J2000),
                 +17.4312d {+17d 25' 52.4"} (current),
                 +17.6884d {+17d 41' 18.0"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       198 [cnts]
IMG_START_DATE:  16417 TJD;   125 DOY;   13/05/05
IMG_START_TIME:  30244.77 SOD {08:24:04.77} UT,   96.4 [sec] since BAT Trigger Time
CENTROID_X:      305.31,  raw= 305  [pixels]
CENTROID_Y:      303.81,  raw= 304  [pixels]
ROLL:            286.92 [deg]
GAIN:            2
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   13.69
GRB_POS_XRT_Z:   3.81
IMAGE_URL:       sw00555163000msxps_rw.img
SUN_POSTN:        42.54d {+02h 50m 11s}  +16.34d {+16d 20' 15"}
SUN_DIST:         89.47 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      349.87d {+23h 19m 28s}   +0.44d {+00d 26' 08"}
MOON_DIST:       143.26 [deg]
MOON_ILLUM:      21 [%]
GAL_COORDS:      211.27, 37.89 [deg] galactic lon,lat of the burst
ECL_COORDS:      134.30,  0.99 [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:     Sun 05 May 13 08:26:31 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     555163,   Seg_Num: 0
GRB_RA:          137.060d {+09h 08m 14s} (J2000),
                 137.247d {+09h 08m 59s} (current),
                 136.359d {+09h 05m 26s} (1950)
GRB_DEC:         +17.485d {+17d 29' 06"} (J2000),
                 +17.431d {+17d 25' 50"} (current),
                 +17.688d {+17d 41' 16"} (1950)
GRB_DATE:        16417 TJD;   125 DOY;   13/05/05
GRB_TIME:        30148.39 SOD {08:22:28.39} UT
TRIGGER_INDEX:   155
GRB_PHI:         -175.87 [deg]
GRB_THETA:        59.43 [deg]
DELTA_TIME:      -50.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x83
RATE_SIGNIF:     255.99 [sigma]
IMAGE_SIGNIF:    6.59 [sigma]
LC_URL:          sw00555163000msb.lc
SUN_POSTN:        42.55d {+02h 50m 11s}  +16.34d {+16d 20' 16"}
SUN_DIST:         89.47 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      349.88d {+23h 19m 31s}   +0.44d {+00d 26' 25"}
MOON_DIST:       143.24 [deg]
MOON_ILLUM:      21 [%]
GAL_COORDS:      211.27, 37.89 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      134.29,  0.99 [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:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 203.17,11.37 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 05 May 13 08:27:23 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     555163,   Seg_Num: 0
POINT_RA:        137.062d {+09h 08m 15s} (J2000)
POINT_DEC:       +17.490d {+17d 29' 23"} (J2000)
POINT_ROLL:      286.922d
IMG_START_DATE:  16417 TJD;   125 DOY;   13/05/05
IMG_START_TIME:  30255.09 SOD {08:24:15.09} UT,   106.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.597
N_STARS:         24
X_OFFSET:        451 [pixels]
Y_OFFSET:        520 [pixels]
X_MAX:           1410 [pixels]
Y_MAX:           1479 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00555163000msufc0106.fits
SUN_POSTN:        42.55d {+02h 50m 11s}  +16.34d {+16d 20' 17"}
SUN_DIST:         89.47 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      349.89d {+23h 19m 33s}   +0.44d {+00d 26' 35"}
MOON_DIST:       143.23 [deg]
MOON_ILLUM:      21 [%]
GAL_COORDS:      211.26, 37.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      134.30,  0.99 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 05 May 13 08:28:00 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     555163,   Seg_Num: 0
POINT_RA:        137.062d {+09h 08m 15s} (J2000)
POINT_DEC:       +17.490d {+17d 29' 23"} (J2000)
POINT_ROLL:      286.922d
IMG_START_DATE:  16417 TJD;   125 DOY;   13/05/05
IMG_START_TIME:  30255.09 SOD {08:24:15.09} UT,   106.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.597
N_STARS:         24
X_OFFSET:        451 [pixels]
Y_OFFSET:        520 [pixels]
X_MAX:           1410 [pixels]
Y_MAX:           1479 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00555163000msufc0106.fits
SUN_POSTN:        42.55d {+02h 50m 11s}  +16.34d {+16d 20' 17"}
SUN_DIST:         89.47 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      349.89d {+23h 19m 34s}   +0.44d {+00d 26' 42"}
MOON_DIST:       143.23 [deg]
MOON_ILLUM:      21 [%]
GAL_COORDS:      211.26, 37.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      134.30,  0.99 [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:     Sun 05 May 13 08:29:03 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     555163,   Seg_Num: 0
POINT_RA:        137.062d {+09h 08m 15s} (J2000)
POINT_DEC:       +17.490d {+17d 29' 23"} (J2000)
ROLL:            286.922d
IMG_START_DATE:  16417 TJD;   125 DOY;   13/05/05
IMG_START_TIME:  30255.09 SOD {08:24:15.09} UT,   106.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     389435065
X_OFFSET:        771 [pixels]
Y_OFFSET:        840 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       931
Y_GRB_POS:       1000
BINNING_INDEX:   1
IM_URL:          sw00555163000msuni0117.fits
SUN_POSTN:        42.55d {+02h 50m 11s}  +16.34d {+16d 20' 18"}
SUN_DIST:         89.47 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      349.90d {+23h 19m 36s}   +0.45d {+00d 26' 53"}
MOON_DIST:       143.22 [deg]
MOON_ILLUM:      21 [%]
GAL_COORDS:      211.26, 37.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      134.30,  0.99 [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:     Sun 05 May 13 08:28:50 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     555163,   Seg_Num: 0
POINT_RA:        137.062d {+09h 08m 15s} (J2000)
POINT_DEC:       +17.490d {+17d 29' 23"} (J2000)
ROLL:            286.922d
IMG_START_DATE:  16417 TJD;   125 DOY;   13/05/05
IMG_START_TIME:  30255.09 SOD {08:24:15.09} UT,   106.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     389435065
X_OFFSET:        771 [pixels]
Y_OFFSET:        840 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       931
Y_GRB_POS:       1000
BINNING_INDEX:   1
IM_URL:          sw00555163000msuni0117.fits
SUN_POSTN:        42.55d {+02h 50m 11s}  +16.34d {+16d 20' 18"}
SUN_DIST:         89.47 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      349.90d {+23h 19m 36s}   +0.45d {+00d 26' 51"}
MOON_DIST:       143.22 [deg]
MOON_ILLUM:      21 [%]
GAL_COORDS:      211.26, 37.89 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      134.30,  0.99 [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:     Sun 05 May 13 08:30:59 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     555163,   Seg_Num: 0
GRB_RA:          137.0610d {+09h 08m 14.64s} (J2000),
                 137.2478d {+09h 08m 59.47s} (current),
                 136.3600d {+09h 05m 26.39s} (1950)
GRB_DEC:         +17.4847d {+17d 29' 04.9"} (J2000),
                 +17.4302d {+17d 25' 48.8"} (current),
                 +17.6874d {+17d 41' 14.4"} (1950)
GRB_ERROR:       0.7 [arcsec radius, statistical only]
GRB_MAG:         14.14 +/- 0.14 [mag]
FILTER:          10, White
IMG_START_DATE:  16417 TJD;   125 DOY;   13/05/05
IMG_START_TIME:  30254.00 SOD {08:24:14.00} UT,   105.6 [sec] since BAT Trigger Time
SUN_POSTN:        42.55d {+02h 50m 12s}  +16.34d {+16d 20' 19"}
SUN_DIST:         89.47 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      349.92d {+23h 19m 40s}   +0.45d {+00d 27' 15"}
MOON_DIST:       143.20 [deg]
MOON_ILLUM:      21 [%]
GAL_COORDS:      211.27, 37.89 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      134.30,  0.99 [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 6.5 arcsec from the XRT position.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 05 May 13 08:33:44 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     555163,   Seg_Num: 0
POINT_RA:        137.064d {+09h 08m 15s} (J2000)
POINT_DEC:       +17.492d {+17d 29' 30"} (J2000)
POINT_ROLL:      286.925d
IMG_START_DATE:  16417 TJD;   125 DOY;   13/05/05
IMG_START_TIME:  30468.01 SOD {08:27:48.01} UT,   319.6 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.868
N_STARS:         15
X_OFFSET:        451 [pixels]
Y_OFFSET:        520 [pixels]
X_MAX:           1410 [pixels]
Y_MAX:           1479 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00555163000msufc0319.fits
SUN_POSTN:        42.55d {+02h 50m 12s}  +16.34d {+16d 20' 21"}
SUN_DIST:         89.47 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      349.94d {+23h 19m 46s}   +0.46d {+00d 27' 46"}
MOON_DIST:       143.18 [deg]
MOON_ILLUM:      21 [%]
GAL_COORDS:      211.26, 37.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      134.30,  0.99 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 05 May 13 08:34:01 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     555163,   Seg_Num: 0
POINT_RA:        137.064d {+09h 08m 15s} (J2000)
POINT_DEC:       +17.492d {+17d 29' 30"} (J2000)
POINT_ROLL:      286.925d
IMG_START_DATE:  16417 TJD;   125 DOY;   13/05/05
IMG_START_TIME:  30468.01 SOD {08:27:48.01} UT,   319.6 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.868
N_STARS:         15
X_OFFSET:        451 [pixels]
Y_OFFSET:        520 [pixels]
X_MAX:           1410 [pixels]
Y_MAX:           1479 [pixels]
DET_THRESH:      8
PHOTO_THRESH:    4
SL_URL:          sw00555163000msufc0319.fits
SUN_POSTN:        42.55d {+02h 50m 12s}  +16.34d {+16d 20' 21"}
SUN_DIST:         89.47 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      349.94d {+23h 19m 46s}   +0.46d {+00d 27' 49"}
MOON_DIST:       143.17 [deg]
MOON_ILLUM:      21 [%]
GAL_COORDS:      211.26, 37.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      134.30,  0.99 [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:     Sun 05 May 13 08:35:02 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     555163,   Seg_Num: 0
POINT_RA:        137.064d {+09h 08m 15s} (J2000)
POINT_DEC:       +17.492d {+17d 29' 30"} (J2000)
ROLL:            286.925d
IMG_START_DATE:  16417 TJD;   125 DOY;   13/05/05
IMG_START_TIME:  30468.01 SOD {08:27:48.01} UT,   319.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     389435278
X_OFFSET:        771 [pixels]
Y_OFFSET:        840 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       931
Y_GRB_POS:       1000
BINNING_INDEX:   1
IM_URL:          sw00555163000msuni0330.fits
SUN_POSTN:        42.55d {+02h 50m 12s}  +16.34d {+16d 20' 22"}
SUN_DIST:         89.47 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      349.95d {+23h 19m 49s}   +0.47d {+00d 28' 00"}
MOON_DIST:       143.16 [deg]
MOON_ILLUM:      21 [%]
GAL_COORDS:      211.26, 37.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      134.30,  0.99 [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:     Sun 05 May 13 08:35:20 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     555163,   Seg_Num: 0
POINT_RA:        137.064d {+09h 08m 15s} (J2000)
POINT_DEC:       +17.492d {+17d 29' 30"} (J2000)
ROLL:            286.925d
IMG_START_DATE:  16417 TJD;   125 DOY;   13/05/05
IMG_START_TIME:  30468.01 SOD {08:27:48.01} UT,   319.6 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     389435278
X_OFFSET:        771 [pixels]
Y_OFFSET:        840 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       931
Y_GRB_POS:       1000
BINNING_INDEX:   1
IM_URL:          sw00555163000msuni0330.fits
SUN_POSTN:        42.55d {+02h 50m 12s}  +16.34d {+16d 20' 22"}
SUN_DIST:         89.47 [deg]   Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN:      349.95d {+23h 19m 49s}   +0.47d {+00d 28' 03"}
MOON_DIST:       143.16 [deg]
MOON_ILLUM:      21 [%]
GAL_COORDS:      211.26, 37.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      134.30,  0.99 [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 Circular #14563
J. K. Cannizzo (NASA/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (NASA/UMBC), V. D'Elia (ASDC), C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC), A. Melandri (INAF-OAB), P. T. O'Brien (U Leicester), B. Sbarufatti (INAF-OAB/PSU) and M. Stamatikos (OSU/NASA/GSFC) report on behalf of the Swift Team:
At 08:22:28 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 130505A (trigger=555163). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 137.060, +17.485 which is
```
   RA(J2000)  =  09h 08m 14s
   Dec(J2000) = +17d 29' 06"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a bright peak followed by a much weaker peak with a total duration of about 20 sec. The peak count rate was ~35,500 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 08:24:04.7 UT, 96.4 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 137.0626, 17.4857 which is equivalent to:
```
   RA(J2000)  = +09h 08m 15.02s
   Dec(J2000) = +17d 29' 08.5"
```
with an uncertainty of 4.8 arcseconds (radius, 90% containment). This location is 9.3 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy.
The initial flux in the 2.5 s image was 7.35e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 106 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	09:08:14.64 = 137.06100
  DEC(J2000) = +17:29:05.2  =  17.48479
```
with a 90%-confidence error radius of about 0.74 arc sec. This position is 6.4 arc sec. from the center of the XRT error circle. The estimated magnitude is 14.14 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.04.
Burst Advocate for this burst is J. K. Cannizzo (cannizzo AT milkyway.gsfc.nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular #14566
GRB 130505A: MAXI/GSC detection
S. Nakahira (JAXA), M. Serino (RIKEN), H. Negoro (Nihon U.), S. Ueno, H. Tomida, M. Kimura, M. Ishikawa (JAXA), T. Mihara, M. Sugizaki, M. Morii, T. Yamamoto, J. Sugimoto, T. Takagi, M. Matsuoka (RIKEN), N. Kawai, R. Usui, K. Ishikawa, T. Yoshii (Tokyo Tech), A. Yoshida, T. Sakamoto, Y. Nakano (AGU), H. Tsunemi, M. Sasaki (Osaka U.), M. Nakajima, T. Onodera, K. Fukushima, K. Suzuki (Nihon U.), Y. Ueda, M. Shidatsu, T. Kawamuro, (Kyoto U.), Y. Tsuboi, M. Higa (Chuo U.), M. Yamauchi, K. Yoshidome, Y. Ogawa, H. Yamada (Miyazaki U.), K. Yamaoka (Nagoya U.) report on behalf of the MAXI team
At 2013-05-05T08:22:29 UT, the MAXI/GSC detected an uncatalogued X-ray transient source. Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec.) = (136.955 deg, 17.585 deg)= (09 07 49 , +17 35 05)(J2000) with a 90% C.L. statistical error of 0.07 deg and an additional systematic uncertainty of 0.1 deg (90% containment radius).
The position and time are consistent with those of GRB 130505A (Cannizzo et al, GCN #14563). The transit by MAXI occurred from 2013-05-05T08:22:18 (=T0-10 s, where T0 is the Swift/BAT trigger time) to T0+40s. The averaged X-ray flux was 3.17 +/- 0.21 Crab (2-20 keV). The spectrum is fitted by a power-law model with a photon index of 1.37 (-0.10/+0.10). There was no significant excess flux at the previous transit at 2013/05/05 06:46 UT and at the next transit at 2013/05/05 09:55 UT with an upper limit of 20 mCrab for each.
GCN Circular #14567
N. R. Tanvir (U. Leicester), A. J. Levan (U. Warwick), T. Matulonis and A. B. Smith (Gemini) report on behalf of a larger collaboration:
We observed the afterglow of GRB 130505A (Cannizzo et al. GCN 14563) with the GMOS-N spectrograph on Gemini-N, beginning approximately 60 min after the BAT trigger.
In our provisional reduction we detect numerous absorption lines, including Lyman alpha, SiII/SiII*1260, SiII*1264, OI1302, SiII/OI*1304, SiII*1309, CII/CII* 1334/1335, SiIV1394/1403, SiII 1527, SiII* 1533, CIV 1548/1551, FeII 1608, AlII 1671 and AlIII 1855/1863 at a common redshift of z=2.27.
The presence of fine structure lines, in particular, confirms this to be the redshift of this burst.
GCN Circular #14568
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 the MITSuME collaboration:
We observed the field of GRB 130505A (Cannizzo et al., GCNC 14563) 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 2013-05-05 10:52:56 UT (~2.5 h after the burst). We detected the previously reported afterglow (Cannizzo et al., GCNC 14563) in all the three bands.
Photometric results of the OT are listed below. We used SDSS catalog for flux calibration.
```
#T0+[day]  MID-UT    T-EXP[sec]   g'  g'_err   Rc  Rc_err   Ic  Ic_err
-----------------------------------------------------------------------
0.11507    11:08:09    1620.0    18.2  0.1    18.2  0.1    17.6  0.1
------------------------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
```
GCN Circular #14569
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 1875 s of XRT Photon Counting mode data and 5 UVOT images for GRB 130505A, 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 = 137.06069, +17.48471 which is equivalent to:
```
RA (J2000): 09h 08m 14.57s
Dec (J2000): +17d 29' 05.0"
```
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 #14570
D. Xu (DARK/NBI), C. Cao, S.-M. Hu, J.-M. Ai (SDU) report:
We observed the field of GRB 130505A (Cannizzo et al., GCN 14563) with the 1m telescope located in Weihai, Shandong Province, China. We obtained 2x600s frames in the solan r-filter with a mean time of 3.3724 hr after the BAT trigger.
The optical afterglow is clearly detected at the UVOT position with r=18.4 +/- 0.1 mag, calibrated against the SDSS field.
GCN Circular #14571
L. P. Xin, J. Y. Wei, Y. L. Qiu, J. Wang, J. S. Deng, C. Wu, X. H. Han report on behalf of EAFON team:
We began to observe the field of GRB 130505A (Cannizzo, et al., GCN 14563) using 80cm TNT telescope located at Xinglong observatory, China at 12:25:39 UT on 2013-05-05. We obtained several R-band images.
The reported optical counterpart (Cannizzo, et al., GCN 14563) is detected in all images. A prelinary analysis shows that its brightness is decaying from R~18.05 to R~18.68 mag during 4.05h and 4.85h after the trigger time. These magnitudes are calibrated with USNO B1.0 R2 stars,
This message may be cited.
GCN Circular #14572
Veli-Pekka Hentunen, Markku Nissinen and Tuomo Salmi (Taurus Hill Observatory, Varkaus, Finland) report:
We have detected GRB 130505A optical afterglow at iTelescope observatory T12 (Siding Spring, Australia) Takahashi FSQ ED 0.10m/5.0 astrograph and SBIG STL-11000M CCD. Five unfiltered images with 600 sec and 300 sec exposure time were made.
The afterglow was detected at following position RA 09:08:14.6 and DEC +17:29:04.
The following magnitudes were obtained from the observations using NOMAD1 1075-0205635 (R=14.240) as the comparison:
```
Tmid(sec)+T0    Filter          Exp. time        Mag      Mag err. 
2485            unfiltered      600            16.78CR     0.06
3370            unfiltered      3x300          17.15CR     0.02
5061            unfiltered      600            17.45CR     0.08
```
GCN Circular #14573
M. De Pasquale (MSSL/UCL) and J. K. Cannizzo (NASA/UMBC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 130505A 107 s after the BAT trigger (Cannizzo et al., GCN Circ. 14563). A bright=20 but rapidly fading source is detected in the finding chart and initial exposu= res within the XRT error circle (Evans et al., GCN Circ. 14569).
The preliminary UVOT position is:
```
   RA(J2000)  =3D    09:08:14.64 =3D 137.0610
   DEC(J2000) =3D   +17:29:05.2  =3D +17.48478
```
with a 90%-confidence error radius of about 0.5 arc sec.
Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
```
Filter         T_start(s)   T_stop(s)    Exp(s)           Mag

white (FC)         107          256        147          14.14 =B1 0.05
white             3952         4151        197          17.96 =B1 0.07
v                 4362         4561        197          17.50 =B1 0.11
b                 3503         3946        197          17.71 =B1 0.08
u                  320          542        218          14.66 =B1 0.04
uvw1              4772         4971        197          19.28 =B1 0.29 (~3 sigma)
uvm2              4567         4766        197          >19.6
uvw2              4158         4357        197          >19.9
```
The non-detection of the optical source in um2 and uw2 filters is consistent with the redshift z=2.27 found by Tanvir et al (GCN Circ. 14567)
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) =3D 0.04 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #14575
S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, report:
The long very intense GRB 130505A (Swift-BAT trigger #555136: Cannizzo et al., GCN 14564) triggered Konus-Wind (K-W) at T0=3D30147.038s UT (08:22:27.038).
The K-W light curve shows a bright pulse with a duration of ~5s followed by a weaker decaying emission out to ~T0+30s with a slight increase in the count rate at ~T0+15s. The emission is seen up to ~10 Mev.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB130505_T30147/
As observed by Konus-Wind, the main phase of the burst had a fluence of (3.13 =B1 0.06)x10^-4 erg/cm2 and a 64-ms peak flux, measured from T0+2.496 s, of (6.9 =B1 0.3)x10^-5 erg/cm2/s (both in the 20 - 1200 keV energy range).
The time-averaged spectrum (measured from T0 to T0+21.248 s) is best fit in the 20 keV-15 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha =3D -0.69 =B1 0.04, the high energy photon index beta =3D -2.03 =B1 0.03, the peak energy Ep =3D 631 =B1 31 keV, chi2 =3D 113/92 dof.
The spectrum at the maximum count rate (measured from T0+2.304 to T0+2.816 s) is best fit in the 20 keV - 15 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha =3D -0.31 =B1 0.09, the high energy photon index beta =3D -2.26 =B1 0.07, the peak energy Ep =3D 604 =B1 49 keV, chi2 =3D 105/90 dof.
Assuming z=2.27 (Tanvir et al., GCN 14567) and a standard cosmology model with H_0 =3D 70 km/s/Mpc, Omega_M =3D 0.27, and Omega_Lambda =3D 0.73, the isotropic energy release E_iso is ~3.8x10^54 erg, the peak luminosity (L_iso)_max is ~2.7x10^54 erg/s, and the rest-frame peak energy Ep,i =3D 2030 keV
All the quoted errors are estimated at the 1 sigma confidence level.
GCN Circular #14576
D. A. Kann (TLS Tautenburg), and S. Schulze (PUC, MCSS) report:
Using the energetics provided by the Konus-Wind detection (Golenetskii et al. 2013, GCN 14575) of the extremely intense Swift GRB 130505A (Cannizzo et al. 2013, GCN 14564), and employing k-correction (Bloom et al. 2003, ApJ, 594, 674), we determine the isotropic energy release in the bolometric band (rest-frame 1 keV - 10 MeV) to be (5.65 +/- 0.13) x 10^54 erg (log E_iso = 54.75 +/- 0.01).
The most isotropically energetic GRBs known so far (all in the rest-frame bolometric band) are GRBs 990123, 080916C and 090323, for which log E_iso ~ 54.5 - 54.6 has been found (e.g., Kann et al. 2010, ApJ, 720, 1513).
This makes GRB 130505A the most energetic GRB known, and may indicate either an ultra-luminous event or a high degree of collimation.
We additionally note that the nearby GRB 130427A (Maselli et al. 2013, GCN 14448; Golenetskii et al. 2013, GCN 14487) is also highly energetic, with log E_iso,bol = 54.21 +/- 0.05, but this is about 3.5 times less than GRB 130505A.
This message may be cited.
GCN Circular #14577
D.N. Burrows (PSU), C. Pagani (U. Leicester), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), G. Stratta (ASDC), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), J.A. Kennea (PSU), M.C. Stroh (PSU) and J.K. Cannizzo report on behalf of the Swift-XRT team:
We have analysed 11 ks of XRT data for GRB 130505A (Cannizzo et al. GCN Circ. 14563), from 102 s to 29.4 ks after the BAT trigger. The data comprise 503 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN. Circ 14569).
The late-time light curve (from T0+3.7 ks) can be modelled with a power-law decay with a decay index of alpha=1.06 (+0.03, -0.04).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.86 (+/-0.03). The best-fitting absorption column is 10.0 (+/-0.7) x 10^20 cm^-2, in excess of the Galactic value of 3.6 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 1.92 (+/-0.07) and a best-fitting absorption column of 8.8 (+1.6, -1.5) x 10^20 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.8 x 10^-11 (4.7 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     8.8 (+1.6, -1.5) x 10^20 cm^-2
Galactic foreground: 3.6 x 10^20 cm^-2
Excess significance: 5.6 sigma
Photon index:	     1.92 (+/-0.07)
```
If the light curve continues to decay with a power-law decay index of 1.06, the count rate at T+24 hours will be 0.27 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.0 x 10^-11 (1.3 x 10^-11) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00555163.
This circular is an official product of the Swift-XRT team.
GCN Circular #14578
D. Frederiks, on behalf of the Konus-Wind team, reports:
We have found a typo in our GCN Circ. 14575 "Konus-Wind observation of GRB 130505A": the correct energy range for the K-W energy fluence and peak flux estimations for GRB 130505A is 20-10000 keV, not "20 - 1200 keV", as mentioned. The 20-10000 keV range is a standard for the K-W estimations of GRB energetics in the observer frame.
We are sorry for the inconvenience.
GCN Circular #14580
D. A. Kann (TLS Tautenburg), and S. Schulze (PUC, MCSS) report:
Following the corrected Konus-Wind energy range (Frederiks, GCN 14578), we recalculated E_iso for GRBs 130505A and 130427A (affected by the same error in GCN 14487, Frederiks, GCN 14579), finding log E_iso,bol = 54.48 +/- 0.01 and 53.89 +/- 0.002, respectively.
This makes GRB 130505A comparable to GRB 080916C, and still one of the most energetic GRBs ever discovered, but not the most energetic of all.
GCN Circular #14585
Yu. Krugly (IA KhNU), I. Slyusarev (IA KhNU), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger collaboration:
We observed a filed of the Swift GRB 130505A (Cannizzo et al. GCN 14563) with 0.7m telescope of Institute of Astronomy, Kharkiv National University between May 05 (UT) 20:52:35 - 21:19:57. A set of images of 180 s were taken in R-filter. In the combined image we clearly detect optical afterglow (Cannizzo et al., GCN 14563; Tanvir et al., GCN 14567; Kuroda et al., GCN 14568). Preliminary photometry is based on the nearby SDSS stars:
```
T_start (UT)                 T0+                Filter   Exp.     OT
                                  mid,days                   s         mag


2013-05-05T20:52:35    0.5309            R        8x180   19.4 +/- 0.07
```
GCN Circular #14589
A. Y. Lien (NASA/GSFC/ORAU), J. R. Cummings (GSFC/UMBC), T. Sakamoto (AGU), C. B. Markwardt (GSFC), S . D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. K. Cannizzo (NASA/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), D. M. Palmer (LANL), M. Stamatikos (OSU), E. Troja (NASA/GSFC/UMCP), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 130505A (trigger #555163) (Cannizzo, et al., GCN Circ. 14563). The BAT ground-calculated position is RA, Dec = 137.060, 17.485 deg which is
```
   RA(J2000)  =  09h 08m 14s
   Dec(J2000) = +17d 29' 06"
```
with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 2%.
The mask-weighted light curve starts at ~T-3 sec, peaks at ~T+0.3 sec, drops sginificantly at ~T+5 sec, and then has a long tail out to ~T+350 sec. T90 (15-350 keV) is 88 +- 10 sec (estimated error including systematics).
The time-averaged spectrum from T-3.0 to T+363.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.18 +- 0.07. The fluence in the 15-150 keV band is 2.1 +- 0.1 x 10^-05 erg/cm2. The 1-sec peak photon flux measured from T+1.44 sec in the 15-150 keV band is 30.0 +- 3.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The spectral results may be skewed toward harder values because of the effects of the extreme partial coding.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/555163/BA/
GCN Circular #14593
D. A. Kann, B. Stecklum, and F. Ludwig (TLS Tautenburg) report:
We observed the optical afterglow (Cannizzo et al., GCN 14563) of the extremely luminous GRB 130505A (Cannizzo et al., GCN 14563; Golenetskii et al., GCN 14575) with the 1.34m Schmidt telescope of the Thueringer Landessternwarte Tautenburg equipped with a 4k CCD camera under good weather conditions. We obtained 3 x 300 sec frames in the Rc band. The afterglow is detected in each frame.
For a nearby SDSS star (RA = 137.082047, Dec. = 17.486120), using the transformations of Lupton (2005), we find: B = 18.118, V = 17.080, Rc = 16.501, Ic = 15.967.
Using this star for calibration, we derive a preliminary magnitude of Rc = 19.09 +/- 0.06 at 0.49118 days after the GRB.
This message may be cited.
GCN Circular #14595
Alan M. Watson (UNAM), Nat Butler (ASU), 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 (UCSC), 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 observed the field of GRB 130505A (Cannizzo, et al., GCN Circular 14563) 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 2013/05 7.13 to 2013/05 7.22 UTC (42.84 to 44.87 hours after the BAT trigger), obtaining a total of 0.36 hours exposure in the r' and i' bands and 0.14 hours exposure in the Z, Y, J, and H bands.
The optical counterpart (Evans et al., GCN Circular 14569) is clearly identified. We obtain the following detections and 3-sigma upper limits:
```
 r' =3D 21.10 =B1 0.27
 i' =3D 20.98 =B1 0.23
 Z	> 21.17
 Y	> 19.15
 J	> 18.38
 H	> 17.15
```
These magnitudes are in the AB system, are calibrated by comparison with SDSS DR8 and 2MASS, and not corrected for Galactic extinction in the direction of the GRB. The quoted uncertainties on the detections are 1 sigma.
We thus confirm the fading reported by other observers at earlier epochs (Kuroda et al., GCN Circular 14568; Xu et al, GCN Circular 14570; Xin et al., GCN Circular 14571; Hentunen et al, GCN Circular 14572; Krugly et al., GCN Circular 14585; and Kann et al., GCN Circular 14593).
No further observations of this source are planned.
We thank the staff of the Observatorio Astron=F3mico Nacional in San Pedro M=E1rtir.
GCN Circular #14599
T. Yasuda, M. Tashiro, Y. Terada, Y. Ishida, H. Ueno, S. Sugimoto (Saitama U.), M. Ohno, K. Takaki, T. Kawano, R. Nakamura, S. Furui, Y. Fukazawa (Hiroshima U.), M. Yamauchi, N. Ohmori, M. Akiyama (Univ. of Miyazaki), K. Yamaoka (Nagoya U.), S. Sugita (Ehime U.), Y. E. Nakagawa, M. Kokubun, T. Takahashi (ISAS/JAXA), W. Iwakiri (RIKEN), Y. Hanabata (ICRR), Y. Urata (NCU), K. Nakazawa, K. Makishima (Univ. of Tokyo) on behalf of the Suzaku WAM team, report:
The bright, long GRB 13505A (GCN 14563; Cannizzo et al.) triggered the Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV at UT 08:22:24.527 (=T0).
The observed light curve shows a bright peak followed by a weaker emission seen up to T0+30 s with a duration (T90) of about 14 seconds. The fluence in 100 - 1000 keV was 1.06 (+0.05/-0.05) x10^-4 erg/cm^2. The 1-s peak flux measured from T0+4 s was 53.1 (+2.0/-2.5) photons/cm^2/s in the same energy range.
Preliminary result shows that the time-averaged spectrum from T0-2 s to T0+30 s is well fitted by a GRB Band model as follows. the low-energy photon index alpha: -0.99 (+0.17/-0.11), the high-energy photon index beta: -2.33 (+0.06/-0.07), and the peak energy Epeak: 1094 (+131/-175) keV (chi^2/d.o.f = 23.9/23). Using a redshift of z = 2.27 (Tanvir et al., GCN 14567), we estimate the isotropic energy release in the 1 keV - 10 MeV range to be 2.55 (+0.12/- 0.11) x10^54 erg and the peak energy at the rest frame to be 3615 (+532/-469) keV, where cosmological parameters of the Omega matter, the Omega lambda and the Hubble constant are fixed at 0.27, 0.73 and 70 km/s/Mpc respectively.
Due to the brightness of this burst, a 3% systematic error was added for low energy channels. All the quoted errors are at statistical 90% confidence level.
The light curves for this burst are available at: http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html
GCN Circular #14602
T. Yoshii, Y. Yatsu, Y. Yano, R. Usui, Y. Tachibana, K. Ito, S. Kurita, Y. Saito, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed GRB 130505A (Maselli et al., GCNC 14563) with an optical tri-color (g, Rc, and Ic) camera attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan.
The observation started at 2013-05-05 11:04:17 UT (9709 sec after the trigger). And we detected the previously reported afterglow . The measured magnitudes were listed below.
```
T0+[MID]   MID-UT   T-EXP[sec]    g'                 Rc                Ic
-----------------------------------------------------------------------------------------------------
 15550s     12:41:38     3480    18.8+/-0.1     18.9+/-0.2      18.0+/-0.1
-----------------------------------------------------------------------------------------------------
T-EXP: Total Exposure time [sec]
(The photon flux were calibrated against GSC2.3 catalog.)
```
GCN Report 429.1
GCN_Report 429.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_429_1.pdf by J.K. Cannizzo at NASA/UMBC titled: "Swift Observations of GRB 130505A"

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Jochen Greiner, last update: 08-May-2013 [Disclaimer]