Gamma-ray Burst 130511A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 11 May 13 11:31:05 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     555600,   Seg_Num: 0
GRB_RA:          196.639d {+13h 06m 33s} (J2000),
                 196.803d {+13h 07m 13s} (current),
                 196.025d {+13h 04m 06s} (1950)
GRB_DEC:         +18.698d {+18d 41' 51"} (J2000),
                 +18.626d {+18d 37' 35"} (current),
                 +18.965d {+18d 57' 53"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       2083 [cnts]    Image_Peak=142 [image_cnts]
TRIGGER_DUR:     0.512 [sec] 
TRIGGER_INDEX:   124     E_range: 25-100 keV
BKG_INTEN:       22192 [cnts]
BKG_TIME:        41437.45 SOD {11:30:37.45} UT
BKG_DUR:         8 [sec]
GRB_DATE:        16423 TJD;   131 DOY;   13/05/11
GRB_TIME:        41447.44 SOD {11:30:47.44} UT
GRB_PHI:          64.35 [deg]
GRB_THETA:        23.37 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     17.02 [sigma]
IMAGE_SIGNIF:    9.07 [sigma]
MERIT_PARAMS:     +1  +0  +0  -1  +2  +0  +0  +0 +66  +0 
SUN_POSTN:        48.51d {+03h 14m 01s}  +17.99d {+17d 59' 21"}
SUN_DIST:        131.93 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       65.45d {+04h 21m 48s}  +19.59d {+19d 35' 33"}
MOON_DIST:       118.86 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      326.13, 80.88 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      187.61, 23.70 [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 = 87.68,4.59 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 11 May 13 11:32:09 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     555600,   Seg_Num: 0
POINT_RA:        196.617d {+13h 06m 28s} (J2000)
POINT_DEC:       +18.708d {+18d 42' 29"} (J2000)
IMG_START_DATE:  16423 TJD;   131 DOY;   13/05/11
IMG_START_TIME:  41518.98 SOD {11:31:58.98} UT,   71.5 [sec] since BAT Trigger Time
COUNTS:          0    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        0    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:     Sat 11 May 13 11:34:45 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     555600,   Seg_Num: 0
GRB_RA:          196.639d {+13h 06m 33s} (J2000),
                 196.803d {+13h 07m 13s} (current),
                 196.025d {+13h 04m 06s} (1950)
GRB_DEC:         +18.698d {+18d 41' 51"} (J2000),
                 +18.626d {+18d 37' 35"} (current),
                 +18.965d {+18d 57' 53"} (1950)
GRB_DATE:        16423 TJD;   131 DOY;   13/05/11
GRB_TIME:        41447.44 SOD {11:30:47.44} UT
TRIGGER_INDEX:   124
GRB_PHI:          64.35 [deg]
GRB_THETA:        23.37 [deg]
DELTA_TIME:      -37.00 [sec]
TRIGGER_DUR:     0.512 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     17.02 [sigma]
IMAGE_SIGNIF:    9.07 [sigma]
LC_URL:          sw00555600000msb.lc
SUN_POSTN:        48.51d {+03h 14m 02s}  +17.99d {+17d 59' 23"}
SUN_DIST:        131.92 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       65.48d {+04h 21m 56s}  +19.59d {+19d 35' 41"}
MOON_DIST:       118.84 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      326.13, 80.88 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      187.61, 23.70 [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 = 87.68,4.59 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 11 May 13 11:34:59 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     555600,   Seg_Num: 0
POINT_RA:        196.617d {+13h 06m 28s} (J2000)
POINT_DEC:       +18.708d {+18d 42' 29"} (J2000)
POINT_ROLL:      317.683d
IMG_START_DATE:  16423 TJD;   131 DOY;   13/05/11
IMG_START_TIME:  41522.17 SOD {11:32:02.17} UT,   74.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.071
N_STARS:         14
X_OFFSET:        357 [pixels]
Y_OFFSET:        696 [pixels]
X_MAX:           1316 [pixels]
Y_MAX:           1655 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00555600000msufc0074.fits
SUN_POSTN:        48.51d {+03h 14m 02s}  +17.99d {+17d 59' 23"}
SUN_DIST:        131.90 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       65.48d {+04h 21m 56s}  +19.60d {+19d 35' 42"}
MOON_DIST:       118.81 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      326.03, 80.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      187.59, 23.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 11 May 13 11:35:37 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     555600,   Seg_Num: 0
POINT_RA:        196.617d {+13h 06m 28s} (J2000)
POINT_DEC:       +18.708d {+18d 42' 29"} (J2000)
POINT_ROLL:      317.683d
IMG_START_DATE:  16423 TJD;   131 DOY;   13/05/11
IMG_START_TIME:  41522.17 SOD {11:32:02.17} UT,   74.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.071
N_STARS:         14
X_OFFSET:        357 [pixels]
Y_OFFSET:        696 [pixels]
X_MAX:           1316 [pixels]
Y_MAX:           1655 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00555600000msufc0074.fits
SUN_POSTN:        48.51d {+03h 14m 02s}  +17.99d {+17d 59' 24"}
SUN_DIST:        131.90 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       65.49d {+04h 21m 58s}  +19.60d {+19d 35' 44"}
MOON_DIST:       118.81 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      326.03, 80.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      187.59, 23.70 [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:     Sat 11 May 13 11:36:26 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     555600,   Seg_Num: 0
POINT_RA:        196.617d {+13h 06m 28s} (J2000)
POINT_DEC:       +18.708d {+18d 42' 29"} (J2000)
ROLL:            317.683d
IMG_START_DATE:  16423 TJD;   131 DOY;   13/05/11
IMG_START_TIME:  41522.17 SOD {11:32:02.17} UT,   74.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     389964732
X_OFFSET:        676 [pixels]
Y_OFFSET:        1015 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       836
Y_GRB_POS:       1175
BINNING_INDEX:   1
IM_URL:          sw00555600000msuni0085.fits
SUN_POSTN:        48.51d {+03h 14m 02s}  +17.99d {+17d 59' 24"}
SUN_DIST:        131.90 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       65.50d {+04h 21m 59s}  +19.60d {+19d 35' 45"}
MOON_DIST:       118.80 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      326.03, 80.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      187.59, 23.70 [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:     Sat 11 May 13 11:36:36 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     555600,   Seg_Num: 0
GRB_RA:          196.6471d {+13h 06m 35.30s} (J2000),
                 196.8110d {+13h 07m 14.64s} (current),
                 196.0333d {+13h 04m 07.99s} (1950)
GRB_DEC:         +18.7086d {+18d 42' 30.9"} (J2000),
                 +18.6374d {+18d 38' 14.5"} (current),
                 +18.9758d {+18d 58' 32.7"} (1950)
GRB_ERROR:       3.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16423 TJD;   131 DOY;   13/05/11
IMG_START_TIME:  41526.00 SOD {11:32:06.00} UT,   78.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        48.51d {+03h 14m 02s}  +17.99d {+17d 59' 24"}
SUN_DIST:        131.92 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       65.50d {+04h 22m 00s}  +19.60d {+19d 35' 46"}
MOON_DIST:       118.82 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      326.20, 80.89 [deg] galactic lon,lat of the burst
ECL_COORDS:      187.62, 23.72 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 11 May 13 11:36:40 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     555600,   Seg_Num: 0
POINT_RA:        196.617d {+13h 06m 28s} (J2000)
POINT_DEC:       +18.708d {+18d 42' 29"} (J2000)
ROLL:            317.683d
IMG_START_DATE:  16423 TJD;   131 DOY;   13/05/11
IMG_START_TIME:  41522.17 SOD {11:32:02.17} UT,   74.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     389964732
X_OFFSET:        676 [pixels]
Y_OFFSET:        1015 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       836
Y_GRB_POS:       1175
BINNING_INDEX:   1
IM_URL:          sw00555600000msuni0085.fits
SUN_POSTN:        48.51d {+03h 14m 02s}  +17.99d {+17d 59' 24"}
SUN_DIST:        131.90 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       65.50d {+04h 22m 00s}  +19.60d {+19d 35' 46"}
MOON_DIST:       118.80 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      326.03, 80.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      187.59, 23.70 [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:     Sat 11 May 13 11:39:32 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     555600,   Seg_Num: 0
GRB_RA:          196.6456d {+13h 06m 34.94s} (J2000),
                 196.8095d {+13h 07m 14.28s} (current),
                 196.0318d {+13h 04m 07.63s} (1950)
GRB_DEC:         +18.7099d {+18d 42' 35.6"} (J2000),
                 +18.6387d {+18d 38' 19.2"} (current),
                 +18.9771d {+18d 58' 37.4"} (1950)
GRB_ERROR:       0.6 [arcsec radius, statistical only]
GRB_MAG:         19.18 +/- 0.14 [mag]
FILTER:          10, White
IMG_START_DATE:  16423 TJD;   131 DOY;   13/05/11
IMG_START_TIME:  41521.00 SOD {11:32:01.00} UT,   73.6 [sec] since BAT Trigger Time
SUN_POSTN:        48.51d {+03h 14m 03s}  +17.99d {+17d 59' 26"}
SUN_DIST:        131.92 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       65.52d {+04h 22m 06s}  +19.60d {+19d 35' 53"}
MOON_DIST:       118.80 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      326.20, 80.89 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      187.62, 23.72 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN Circular #14620
H. A. Krimm (CRESST/GSFC/USRA), D. N. Burrows (PSU), N. Gehrels (NASA/GSFC), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 11:30:47 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 130511A (trigger=555600). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 196.639, +18.698 which is
```
   RA(J2000) = 13h 06m 33s
   Dec(J2000) = +18d 41' 51"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single short peak of duration ~0.5 sec followed by a 10-second tail. The peak count rate was ~3000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 11:31:58.9 UT, 71.6 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 196.64698, 18.70893 which is equivalent to:
```
   RA(J2000)  = 13h 06m 35.28s
   Dec(J2000) = +18d 42' 32.1"
```
with an uncertainty of 3.6 arcseconds (radius, 90% containment). This location is 47 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (2.08 x 10^20 cm^-2, Kalberla et al. 2005), with an excess column of 2.5 (+1.47/-1.33) x 10^21 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 74 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	13:06:34.96 = 196.64567
  DEC(J2000) = +18:42:36.0  =  18.70999
```
with a 90%-confidence error radius of about 0.64 arc sec. This position is 7.0 arc sec. from the center of the XRT error circle. The estimated magnitude is 19.18 with a 1-sigma error of about 0.15. No correction has been made for the expected extinction corresponding to E(B-V) of 0.03.
Burst Advocate for this burst is H. A. Krimm (krimm AT milkyway.gsfc.nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 11 May 13 11:43:09 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     555600,   Seg_Num: 0
POINT_RA:        196.615d {+13h 06m 28s} (J2000)
POINT_DEC:       +18.709d {+18d 42' 33"} (J2000)
POINT_ROLL:      317.682d
IMG_START_DATE:  16423 TJD;   131 DOY;   13/05/11
IMG_START_TIME:  41735.29 SOD {11:35:35.29} UT,   287.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.548
N_STARS:         27
X_OFFSET:        117 [pixels]
Y_OFFSET:        456 [pixels]
X_MAX:           1556 [pixels]
Y_MAX:           1895 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00555600000msufc0287.fits
SUN_POSTN:        48.51d {+03h 14m 03s}  +17.99d {+17d 59' 28"}
SUN_DIST:        131.90 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       65.56d {+04h 22m 14s}  +19.60d {+19d 36' 02"}
MOON_DIST:       118.75 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      326.02, 80.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      187.59, 23.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 11 May 13 11:43:29 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     555600,   Seg_Num: 0
POINT_RA:        196.615d {+13h 06m 28s} (J2000)
POINT_DEC:       +18.709d {+18d 42' 33"} (J2000)
POINT_ROLL:      317.682d
IMG_START_DATE:  16423 TJD;   131 DOY;   13/05/11
IMG_START_TIME:  41735.29 SOD {11:35:35.29} UT,   287.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.548
N_STARS:         27
X_OFFSET:        117 [pixels]
Y_OFFSET:        456 [pixels]
X_MAX:           1556 [pixels]
Y_MAX:           1895 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00555600000msufc0287.fits
SUN_POSTN:        48.51d {+03h 14m 03s}  +17.99d {+17d 59' 29"}
SUN_DIST:        131.90 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       65.56d {+04h 22m 14s}  +19.60d {+19d 36' 02"}
MOON_DIST:       118.75 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      326.02, 80.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      187.59, 23.70 [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:     Sat 11 May 13 11:43:50 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     555600,   Seg_Num: 0
GRB_RA:          196.6449d {+13h 06m 34.77s} (J2000),
                 196.8088d {+13h 07m 14.11s} (current),
                 196.0311d {+13h 04m 07.46s} (1950)
GRB_DEC:         +18.7097d {+18d 42' 34.9"} (J2000),
                 +18.6385d {+18d 38' 18.5"} (current),
                 +18.9769d {+18d 58' 36.7"} (1950)
GRB_ERROR:       2.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16423 TJD;   131 DOY;   13/05/11
IMG_START_TIME:  41526.00 SOD {11:32:06.00} UT,   78.6 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        48.51d {+03h 14m 03s}  +17.99d {+17d 59' 29"}
SUN_DIST:        131.91 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       65.56d {+04h 22m 15s}  +19.60d {+19d 36' 03"}
MOON_DIST:       118.77 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      326.19, 80.89 [deg] galactic lon,lat of the burst
ECL_COORDS:      187.61, 23.72 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 11 May 13 11:44:29 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     555600,   Seg_Num: 0
POINT_RA:        196.615d {+13h 06m 28s} (J2000)
POINT_DEC:       +18.709d {+18d 42' 33"} (J2000)
ROLL:            317.682d
IMG_START_DATE:  16423 TJD;   131 DOY;   13/05/11
IMG_START_TIME:  41735.29 SOD {11:35:35.29} UT,   287.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     389964945
X_OFFSET:        676 [pixels]
Y_OFFSET:        1015 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       836
Y_GRB_POS:       1175
BINNING_INDEX:   1
IM_URL:          sw00555600000msuni0298.fits
SUN_POSTN:        48.51d {+03h 14m 03s}  +17.99d {+17d 59' 29"}
SUN_DIST:        131.89 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       65.57d {+04h 22m 16s}  +19.60d {+19d 36' 05"}
MOON_DIST:       118.74 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      326.02, 80.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      187.59, 23.70 [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:     Sat 11 May 13 11:44:46 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     555600,   Seg_Num: 0
POINT_RA:        196.615d {+13h 06m 28s} (J2000)
POINT_DEC:       +18.709d {+18d 42' 33"} (J2000)
ROLL:            317.682d
IMG_START_DATE:  16423 TJD;   131 DOY;   13/05/11
IMG_START_TIME:  41735.29 SOD {11:35:35.29} UT,   287.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     389964945
X_OFFSET:        676 [pixels]
Y_OFFSET:        1015 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       836
Y_GRB_POS:       1175
BINNING_INDEX:   1
IM_URL:          sw00555600000msuni0298.fits
SUN_POSTN:        48.51d {+03h 14m 03s}  +17.99d {+17d 59' 29"}
SUN_DIST:        131.89 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       65.57d {+04h 22m 17s}  +19.60d {+19d 36' 06"}
MOON_DIST:       118.74 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      326.02, 80.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      187.59, 23.70 [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:     Sat 11 May 13 11:49:14 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     555600,   Seg_Num: 0
POINT_RA:        196.615d {+13h 06m 28s} (J2000)
POINT_DEC:       +18.709d {+18d 42' 31"} (J2000)
POINT_ROLL:      317.683d
IMG_START_DATE:  16423 TJD;   131 DOY;   13/05/11
IMG_START_TIME:  42312.72 SOD {11:45:12.72} UT,   865.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.968
N_STARS:         43
X_OFFSET:        117 [pixels]
Y_OFFSET:        456 [pixels]
X_MAX:           1556 [pixels]
Y_MAX:           1895 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00555600000msufc0865.fits
SUN_POSTN:        48.52d {+03h 14m 04s}  +17.99d {+17d 59' 32"}
SUN_DIST:        131.89 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       65.61d {+04h 22m 26s}  +19.60d {+19d 36' 16"}
MOON_DIST:       118.71 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      326.02, 80.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      187.59, 23.70 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 11 May 13 11:49:32 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     555600,   Seg_Num: 0
POINT_RA:        196.615d {+13h 06m 28s} (J2000)
POINT_DEC:       +18.709d {+18d 42' 31"} (J2000)
POINT_ROLL:      317.683d
IMG_START_DATE:  16423 TJD;   131 DOY;   13/05/11
IMG_START_TIME:  42312.72 SOD {11:45:12.72} UT,   865.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.968
N_STARS:         43
X_OFFSET:        117 [pixels]
Y_OFFSET:        456 [pixels]
X_MAX:           1556 [pixels]
Y_MAX:           1895 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00555600000msufc0865.fits
SUN_POSTN:        48.52d {+03h 14m 04s}  +17.99d {+17d 59' 32"}
SUN_DIST:        131.89 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       65.61d {+04h 22m 27s}  +19.60d {+19d 36' 17"}
MOON_DIST:       118.71 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      326.02, 80.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      187.59, 23.70 [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:     Sat 11 May 13 11:50:47 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     555600,   Seg_Num: 0
POINT_RA:        196.615d {+13h 06m 28s} (J2000)
POINT_DEC:       +18.709d {+18d 42' 31"} (J2000)
ROLL:            317.683d
IMG_START_DATE:  16423 TJD;   131 DOY;   13/05/11
IMG_START_TIME:  42312.72 SOD {11:45:12.72} UT,   865.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     389965523
X_OFFSET:        676 [pixels]
Y_OFFSET:        1015 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       836
Y_GRB_POS:       1175
BINNING_INDEX:   1
IM_URL:          sw00555600000msuni0876.fits
SUN_POSTN:        48.52d {+03h 14m 04s}  +17.99d {+17d 59' 33"}
SUN_DIST:        131.89 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       65.62d {+04h 22m 30s}  +19.61d {+19d 36' 20"}
MOON_DIST:       118.70 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      326.02, 80.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      187.59, 23.70 [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:     Sat 11 May 13 11:51:00 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     555600,   Seg_Num: 0
POINT_RA:        196.615d {+13h 06m 28s} (J2000)
POINT_DEC:       +18.709d {+18d 42' 31"} (J2000)
ROLL:            317.683d
IMG_START_DATE:  16423 TJD;   131 DOY;   13/05/11
IMG_START_TIME:  42312.72 SOD {11:45:12.72} UT,   865.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     389965523
X_OFFSET:        676 [pixels]
Y_OFFSET:        1015 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       836
Y_GRB_POS:       1175
BINNING_INDEX:   1
IM_URL:          sw00555600000msuni0876.fits
SUN_POSTN:        48.52d {+03h 14m 04s}  +17.99d {+17d 59' 33"}
SUN_DIST:        131.89 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       65.63d {+04h 22m 30s}  +19.61d {+19d 36' 20"}
MOON_DIST:       118.70 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      326.02, 80.90 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      187.59, 23.70 [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 #14621
A. Cucchiara (UCSC) and N. R. Tanvir (U. Leicester) report on behalf of a larger collaboration:
On May 11.511 UT (~45 minutes after the Swift trigger) we observed the optical counterpart of GRB 130511A (Krimm et al. GCN 14620) with the GMOS spectrograph mounted on the Gemini-North telescope.
The observation consists of 2x900s exposures using the B600 grating and covers the 5100-7900 Angstroms wavelength range.
The resulting spectrum presents several absorption lines, including FeII(2344,2382,2374,2600), FeII*(2338,2349), FeI2463, MnII(25762594), MgII doublet (2796,2803A), and MgI2853 at the common redshift of z=1.3033.
We therefore propose this as the redshift of GRB 130511A.
We thank the Gemini staff for performing this observation, in particular Tom Geballe.
GCN Circular #14622
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 1521 s of XRT Photon Counting mode data and 1 UVOT images for GRB 130511A, 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 = 196.64526, +18.70977 which is equivalent to:
```
RA (J2000): 13h 06m 34.86s
Dec (J2000): +18d 42' 35.2"
```
with an uncertainty of 1.8 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #14623
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 130511A (Krimm et al. GCN 14620) using 80cm TNT telescope located at Xinglong observatory, China, at 41.9 min after the burst on 12:12:41 UT, May 11th, 2013. 15*300sec R-band images was obtained.
The reported optical counterpart (Krimm et al. GCN 14620; Cucchiara et a. GCN 14621) was not detected in all single images and the combined image, down to the upper limit of R~19.6 mag calibrated by USNO B1.0 R2 mag, at the mean time of 62.3 min after the trigger time.
This message may be cited.
GCN Circular #14624
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/GSFC/ORAU), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU),T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+950 sec from the recent telemetry downlink, we report further analysis of BAT GRB 130511A (trigger #555600) (Krimm, et al., GCN Circ. 14620). The BAT ground-calculated position is RA, Dec = 196.654, 18.709 deg which is
```
    RA(J2000)  =  13h 06m 36.9s
    Dec(J2000) = +18d 42' 33.7"
```
with an uncertainty of 2.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 57%.
The mask-weighted light curve shows an initial sharp double-peak at T0 of duration ~0.5 seconds, transitioning to a FRED-like decay lasting ~5 seconds, after which the light curve returns to baseline. T90 (15-350 keV) is 5.43 +- 2.22 sec (estimated error including systematics).
The time-averaged spectrum from T-0.07 to T+6.03 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.35 +- 0.31. The fluence in the 15-150 keV band is 2.2 +- 0.4 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T-0.09 sec in the 15-150 keV band is 1.3 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/555600/BA/
GCN Circular #14625
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 and OISTER collaboration:
We observed the field of GRB 130511A (Krimm et al., GCNC 14620) 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 2013-05-11 12:01:00 UT (~30 min after the burst). We did not find any new point source within the enhanced XRT error circle (Osborne et al., GCNC 14622) in all the three bands.
Three sigma upper limits of the OT are listed below. We used SDSS catalog for flux calibration.
```
#T0+[day]  MID-UT    T-EXP[sec]   g'     Rc     Ic
-----------------------------------------------------
0.16126    15:23:00    5940.0   >20.7  >20.7  >19.8
-----------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
```
GCN Circular #14626
K. Takaki, K. Kawaguchi, K. S. Kawabata, M. Ohno and M. Yoshida (Hiroshima Univ.) report on behalf of Kanata team:
We performed optical observations of GRB 130511A (Krimm et al., GCN 14620) with HOWPol attached to the 1.5-m Kanata telescope at Higashi-Hiroshima Observatory, Japan. The observation started at 11:32 UT on 2013 May 11 with imaging-polarimetry mode, followed by observation with imaging mode after 12:10 UT. We detected the optical afterglow of the GRB.
Photometric results are shown below. We calibrated the Rc magnitude using USNO-B1.0 R2 magnitudes of nearby stars. Our result seems to be consistent with the brightness upper-limits reported in Xin et al. (GCN 14623) and Kuroda et al. (GCN 14625). The decline rate between these two epochs can be approximated by a single power-law with an index of -0.7.
```
Mid time from  Total Exp   Filter    Magnitude
trigger (s)    (s)
-------------------------------------------------
2571            300x2        Rc    20.0+-0.1
8768            300x2        Rc    21.0+-0.2
-------------------------------------------------
```
This message may be cited.
GCN Circular #14627
P.A. Evans (U. Leicester), B.P. Gompertz (U. Leicester), V. D'Elia (ASDC), A. Maselli (INAF-IASFPA), V. Mangano (INAF-IASFPA), M.C. Stroh (PSU), D.N. Burrows (PSU), J.A. Kennea (PSU), J.P. Osborne (U. Leicester) and H.A. Krimm report on behalf of the Swift-XRT team:
We have analysed 8.4 ks of XRT data for GRB 130511A (Krimm et al. GCN Circ. 14620), from 57 s to 36.5 ks after the BAT trigger. The data comprise 8 s in Windowed Timing (WT) mode (taken while Swift was slewing), with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN. Circ 14622).
The light curve can be modelled with a power-law decay with a decay index of alpha=0.99 (+/-0.04).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.03 (+0.20, -0.19). The best-fitting absorption column is 1.1 (+0.5, -0.4) x 10^21 cm^-2, in excess of the Galactic value of 2.1 x 10^20 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.6 x 10^-11 (4.8 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.1 (+0.5, -0.4) x 10^21 cm^-2
Galactic foreground: 2.1 x 10^20 cm^-2
Excess significance: 3.5 sigma
Photon index:	     2.03 (+0.20, -0.19)
```
If the light curve continues to decay with a power-law decay index of 0.99, the count rate at T+24 hours will be 2.6 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 9.4 x 10^-14 (1.2 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/00555600.
This circular is an official product of the Swift-XRT team.
GCN Circular #14628
M. Im (CEOU/SNU), H.-I. Sung (KASI), & Y. Urata (NCU) on behalf of a larger collaboration
We observed GRB 130511A (Krimm et al., GCN 14620) in BVRI filters using a 0.6m telescope at the Sobaeksan Optical Astronomy Observatory (SOAO), starting at 76min after the BAT alert.
In stacked images of 6 x 300sec exposures, we identify the optical afterglow with the following magnitude (Cucchiara et al. GCN 14621; Takaki et al. GCN 14626), calibrated against a USNO-B1 star in the vicinity.
```
   T(mid, UT)         Mag
05-11 13:50:12     R=20.78 +- 0.13
```
The afterglow is detected in the other bands, but at a lower S/N.
We thank the staffs at SOAO for performing the observation.
GCN Circular #14652
F. Yuan, M. Childress, S. Rapoport, B. Schmidt, M. Dopita (Australian National University) and J. Scharwachter (Observatoire de Paris)
We observed the field of GRB 130511A (Krimm et al., GCN 14620) using the Wide Field Spectrograph (WiFeS) on the ANU 2.3m. Three 900s integration at resolution R=3000, covering 540 - 950nm, were obtained starting at 2013-05-11 12:03 UTC, ~32 minutes after the Swift trigger.
Spectral photometry of the sky-subtracted data cube was carried out in a 6" diameter aperture. Compared to a nearby field star, we measure the optical afterglow to be at r ~ 20.2 and i ~ 20.1 at a mean time of ~ 1 hr after the burst. We thank Tiantian Yuan, Fred Vogt and Rebecca Davis for performing this observation.

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Jochen Greiner, last update: 15-May-2013 [Disclaimer]