Gamma-ray Burst 131024A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 24 Oct 13 12:27:38 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     575707,   Seg_Num: 0
GRB_RA:          290.464d {+19h 21m 51s} (J2000),
                 290.792d {+19h 23m 10s} (current),
                 289.270d {+19h 17m 05s} (1950)
GRB_DEC:         -64.603d {-64d 36' 08"} (J2000),
                 -64.575d {-64d 34' 30"} (current),
                 -64.697d {-64d 41' 49"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=1563 [image_cnts]
TRIGGER_DUR:     64.000 [sec] 
TRIGGER_INDEX:   20000     E_range: 15-50 keV
BKG_INTEN:       0 [cnts]
BKG_TIME:        0.00 SOD {00:00:00.00} UT
BKG_DUR:         0 [sec]
GRB_DATE:        16589 TJD;   297 DOY;   13/10/24
GRB_TIME:        44780.81 SOD {12:26:20.81} UT
GRB_PHI:         -58.64 [deg]
GRB_THETA:        21.23 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    8.50 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  -1  +0  +0 -24  +0 
SUN_POSTN:       209.11d {+13h 56m 27s}  -11.91d {-11d 54' 35"}
SUN_DIST:         75.69 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       94.66d {+06h 18m 39s}  +18.92d {+18d 54' 54"}
MOON_DIST:       133.07 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      331.58,-27.54 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      281.64,-41.99 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 66.83,-17.49 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 24 Oct 13 12:28:41 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     575707,   Seg_Num: 0
POINT_RA:        290.516d {+19h 22m 04s} (J2000)
POINT_DEC:       -64.606d {-64d 36' 22"} (J2000)
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  44914.29 SOD {12:28:34.29} UT,   133.5 [sec] since BAT Trigger Time
COUNTS:          1    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:     Thu 24 Oct 13 12:30:25 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     575707,   Seg_Num: 0
GRB_RA:          290.464d {+19h 21m 51s} (J2000),
                 290.792d {+19h 23m 10s} (current),
                 289.270d {+19h 17m 05s} (1950)
GRB_DEC:         -64.603d {-64d 36' 08"} (J2000),
                 -64.575d {-64d 34' 30"} (current),
                 -64.697d {-64d 41' 49"} (1950)
GRB_DATE:        16589 TJD;   297 DOY;   13/10/24
GRB_TIME:        44780.81 SOD {12:26:20.81} UT
TRIGGER_INDEX:   20000
GRB_PHI:         -58.64 [deg]
GRB_THETA:        21.23 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    8.50 [sigma]
LC_URL:          sw00575707000msb.lc
SUN_POSTN:       209.12d {+13h 56m 28s}  -11.91d {-11d 54' 38"}
SUN_DIST:         75.69 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       94.69d {+06h 18m 45s}  +18.91d {+18d 54' 48"}
MOON_DIST:       133.07 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      331.58,-27.54 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      281.64,-41.99 [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 an image trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 66.83,-17.49 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 24 Oct 13 12:31:31 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     575707,   Seg_Num: 0
POINT_RA:        290.515d {+19h 22m 04s} (J2000)
POINT_DEC:       -64.606d {-64d 36' 21"} (J2000)
POINT_ROLL:      272.567d
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  44917.63 SOD {12:28:37.63} UT,   136.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.674
N_STARS:         173
X_OFFSET:        649 [pixels]
Y_OFFSET:        493 [pixels]
X_MAX:           1608 [pixels]
Y_MAX:           1452 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00575707000msufc0136.fits
SUN_POSTN:       209.12d {+13h 56m 28s}  -11.91d {-11d 54' 39"}
SUN_DIST:         75.71 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       94.70d {+06h 18m 47s}  +18.91d {+18d 54' 45"}
MOON_DIST:       133.06 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      331.58,-27.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      281.67,-42.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 24 Oct 13 12:31:56 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     575707,   Seg_Num: 0
POINT_RA:        290.515d {+19h 22m 04s} (J2000)
POINT_DEC:       -64.606d {-64d 36' 21"} (J2000)
POINT_ROLL:      272.567d
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  44917.63 SOD {12:28:37.63} UT,   136.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.674
N_STARS:         173
X_OFFSET:        649 [pixels]
Y_OFFSET:        493 [pixels]
X_MAX:           1608 [pixels]
Y_MAX:           1452 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00575707000msufc0136.fits
SUN_POSTN:       209.12d {+13h 56m 28s}  -11.91d {-11d 54' 39"}
SUN_DIST:         75.71 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       94.70d {+06h 18m 48s}  +18.91d {+18d 54' 44"}
MOON_DIST:       133.06 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      331.58,-27.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      281.67,-42.00 [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:     Thu 24 Oct 13 12:32:56 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     575707,   Seg_Num: 0
POINT_RA:        290.515d {+19h 22m 04s} (J2000)
POINT_DEC:       -64.606d {-64d 36' 21"} (J2000)
ROLL:            272.567d
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  44917.63 SOD {12:28:37.63} UT,   136.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     404310528
X_OFFSET:        968 [pixels]
Y_OFFSET:        812 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1128
Y_GRB_POS:       972
BINNING_INDEX:   1
IM_URL:          sw00575707000msuni0148.fits
SUN_POSTN:       209.12d {+13h 56m 28s}  -11.91d {-11d 54' 40"}
SUN_DIST:         75.71 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       94.71d {+06h 18m 50s}  +18.91d {+18d 54' 42"}
MOON_DIST:       133.06 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      331.58,-27.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      281.67,-42.00 [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:     Thu 24 Oct 13 12:33:22 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     575707,   Seg_Num: 0
POINT_RA:        290.515d {+19h 22m 04s} (J2000)
POINT_DEC:       -64.606d {-64d 36' 21"} (J2000)
ROLL:            272.567d
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  44917.63 SOD {12:28:37.63} UT,   136.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     404310528
X_OFFSET:        968 [pixels]
Y_OFFSET:        812 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1128
Y_GRB_POS:       972
BINNING_INDEX:   1
IM_URL:          sw00575707000msuni0148.fits
SUN_POSTN:       209.12d {+13h 56m 28s}  -11.91d {-11d 54' 40"}
SUN_DIST:         75.71 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       94.71d {+06h 18m 51s}  +18.91d {+18d 54' 40"}
MOON_DIST:       133.07 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      331.58,-27.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      281.67,-42.00 [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:     Thu 24 Oct 13 12:33:05 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     575707,   Seg_Num: 0
GRB_RA:          290.4822d {+19h 21m 55.72s} (J2000),
                 290.8106d {+19h 23m 14.55s} (current),
                 289.2891d {+19h 17m 09.38s} (1950)
GRB_DEC:         -64.6018d {-64d 36' 06.4"} (J2000),
                 -64.5747d {-64d 34' 28.8"} (current),
                 -64.6965d {-64d 41' 47.4"} (1950)
GRB_ERROR:       4.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  44940.00 SOD {12:29:00.00} UT,   159.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       209.12d {+13h 56m 28s}  -11.91d {-11d 54' 40"}
SUN_DIST:         75.69 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       94.71d {+06h 18m 50s}  +18.91d {+18d 54' 41"}
MOON_DIST:       133.07 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      331.58,-27.55 [deg] galactic lon,lat of the burst
ECL_COORDS:      281.65,-41.99 [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 Circular #15365
J. L. Racusin (NASA/GSFC), D. N. Burrows (PSU), N. Gehrels (NASA/GSFC), H. A. Krimm (CRESST/GSFC/USRA), A. Maselli (INAF-IASFPA), K. L. Page (U Leicester), D. M. Palmer (LANL), P. Romano (INAF-IASFPA), M. H. Siegel (PSU), E. Troja (NASA/GSFC/UMCP) and T. N. Ukwatta (MSU) report on behalf of the Swift Team:
At 12:26:20 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 131024A (trigger=575707). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 290.464, -64.603 which is
```
   RA(J2000) = 19h 21m 51s
   Dec(J2000) = -64d 36' 08"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). As is usual with an image trigger, the available BAT light curve shows no significant structure.
The XRT began observing the field at 12:28:34.2 UT, 133.5 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source located at RA, Dec 290.48228, -64.60181 which is equivalent to:
```
   RA(J2000)  = 19h 21m 55.75s
   Dec(J2000) = -64d 36' 06.5"
```
with an uncertainty of 4.0 arcseconds (radius, 90% containment). This location is 28 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 consistent with the Galactic value of 4.45 x 10^20 cm^-2 (Kalberla et al. 2005).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 136 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.05.
Burst Advocate for this burst is J. L. Racusin (judith.racusin AT 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:     Thu 24 Oct 13 12:38:37 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     575707,   Seg_Num: 0
POINT_RA:        290.522d {+19h 22m 05s} (J2000)
POINT_DEC:       -64.608d {-64d 36' 26"} (J2000)
POINT_ROLL:      272.562d
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  45075.61 SOD {12:31:15.61} UT,   294.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.672
N_STARS:         190
X_OFFSET:        409 [pixels]
Y_OFFSET:        253 [pixels]
X_MAX:           1848 [pixels]
Y_MAX:           1692 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00575707000msufc0294.fits
SUN_POSTN:       209.12d {+13h 56m 29s}  -11.91d {-11d 54' 45"}
SUN_DIST:         75.71 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       94.76d {+06h 19m 02s}  +18.91d {+18d 54' 28"}
MOON_DIST:       133.07 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      331.58,-27.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      281.67,-42.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 24 Oct 13 12:39:05 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     575707,   Seg_Num: 0
POINT_RA:        290.522d {+19h 22m 05s} (J2000)
POINT_DEC:       -64.608d {-64d 36' 26"} (J2000)
POINT_ROLL:      272.562d
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  45075.61 SOD {12:31:15.61} UT,   294.8 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.672
N_STARS:         190
X_OFFSET:        409 [pixels]
Y_OFFSET:        253 [pixels]
X_MAX:           1848 [pixels]
Y_MAX:           1692 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00575707000msufc0294.fits
SUN_POSTN:       209.12d {+13h 56m 29s}  -11.91d {-11d 54' 45"}
SUN_DIST:         75.71 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       94.76d {+06h 19m 03s}  +18.91d {+18d 54' 26"}
MOON_DIST:       133.07 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      331.58,-27.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      281.67,-42.00 [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:     Thu 24 Oct 13 12:39:23 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     575707,   Seg_Num: 0
GRB_RA:          290.4798d {+19h 21m 55.15s} (J2000),
                 290.8083d {+19h 23m 13.98s} (current),
                 289.2867d {+19h 17m 08.80s} (1950)
GRB_DEC:         -64.6029d {-64d 36' 10.4"} (J2000),
                 -64.5758d {-64d 34' 32.8"} (current),
                 -64.6976d {-64d 41' 51.3"} (1950)
GRB_ERROR:       2.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  44940.00 SOD {12:29:00.00} UT,   159.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       209.12d {+13h 56m 29s}  -11.91d {-11d 54' 46"}
SUN_DIST:         75.69 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       94.76d {+06h 19m 03s}  +18.91d {+18d 54' 26"}
MOON_DIST:       133.08 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      331.58,-27.55 [deg] galactic lon,lat of the burst
ECL_COORDS:      281.65,-41.99 [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:     Thu 24 Oct 13 12:40:18 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     575707,   Seg_Num: 0
POINT_RA:        290.522d {+19h 22m 05s} (J2000)
POINT_DEC:       -64.608d {-64d 36' 26"} (J2000)
ROLL:            272.562d
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  45075.61 SOD {12:31:15.61} UT,   294.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     404310686
X_OFFSET:        968 [pixels]
Y_OFFSET:        812 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1128
Y_GRB_POS:       972
BINNING_INDEX:   1
IM_URL:          sw00575707000msuni0306.fits
SUN_POSTN:       209.12d {+13h 56m 29s}  -11.91d {-11d 54' 46"}
SUN_DIST:         75.71 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       94.77d {+06h 19m 05s}  +18.91d {+18d 54' 24"}
MOON_DIST:       133.07 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      331.58,-27.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      281.67,-42.00 [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:     Thu 24 Oct 13 12:40:26 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     575707,   Seg_Num: 0
POINT_RA:        290.522d {+19h 22m 05s} (J2000)
POINT_DEC:       -64.608d {-64d 36' 26"} (J2000)
ROLL:            272.562d
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  45075.61 SOD {12:31:15.61} UT,   294.8 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     404310686
X_OFFSET:        968 [pixels]
Y_OFFSET:        812 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1128
Y_GRB_POS:       972
BINNING_INDEX:   1
IM_URL:          sw00575707000msuni0306.fits
SUN_POSTN:       209.12d {+13h 56m 29s}  -11.91d {-11d 54' 46"}
SUN_DIST:         75.71 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       94.77d {+06h 19m 06s}  +18.91d {+18d 54' 23"}
MOON_DIST:       133.07 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:      331.58,-27.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      281.67,-42.00 [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:     Thu 24 Oct 13 12:44:19 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     575707,   Seg_Num: 0
POINT_RA:        290.522d {+19h 22m 05s} (J2000)
POINT_DEC:       -64.608d {-64d 36' 26"} (J2000)
POINT_ROLL:      272.562d
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  45652.49 SOD {12:40:52.49} UT,   871.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.261
N_STARS:         190
X_OFFSET:        409 [pixels]
Y_OFFSET:        253 [pixels]
X_MAX:           1848 [pixels]
Y_MAX:           1692 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00575707000msufc0871.fits
SUN_POSTN:       209.12d {+13h 56m 30s}  -11.91d {-11d 54' 50"}
SUN_DIST:         75.71 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       94.81d {+06h 19m 14s}  +18.90d {+18d 54' 14"}
MOON_DIST:       133.07 [deg]
MOON_ILLUM:      72 [%]
GAL_COORDS:      331.58,-27.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      281.67,-42.00 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 24 Oct 13 12:44:38 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     575707,   Seg_Num: 0
POINT_RA:        290.522d {+19h 22m 05s} (J2000)
POINT_DEC:       -64.608d {-64d 36' 26"} (J2000)
POINT_ROLL:      272.562d
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  45652.49 SOD {12:40:52.49} UT,   871.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.261
N_STARS:         190
X_OFFSET:        409 [pixels]
Y_OFFSET:        253 [pixels]
X_MAX:           1848 [pixels]
Y_MAX:           1692 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00575707000msufc0871.fits
SUN_POSTN:       209.12d {+13h 56m 30s}  -11.91d {-11d 54' 50"}
SUN_DIST:         75.71 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       94.81d {+06h 19m 14s}  +18.90d {+18d 54' 13"}
MOON_DIST:       133.07 [deg]
MOON_ILLUM:      72 [%]
GAL_COORDS:      331.58,-27.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      281.67,-42.00 [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:     Thu 24 Oct 13 12:45:57 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     575707,   Seg_Num: 0
POINT_RA:        290.522d {+19h 22m 05s} (J2000)
POINT_DEC:       -64.608d {-64d 36' 26"} (J2000)
ROLL:            272.562d
MG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  45652.49 SOD {12:40:52.49} UT,   871.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     404311263
X_OFFSET:        968 [pixels]
Y_OFFSET:        812 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1128
Y_GRB_POS:       972
BINNING_INDEX:   1
IM_URL:          sw00575707000msuni0883.fits
SUN_POSTN:       209.13d {+13h 56m 30s}  -11.91d {-11d 54' 51"}
SUN_DIST:         75.71 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       94.82d {+06h 19m 17s}  +18.90d {+18d 54' 10"}
MOON_DIST:       133.07 [deg]
MOON_ILLUM:      72 [%]
GAL_COORDS:      331.58,-27.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      281.67,-42.00 [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:     Thu 24 Oct 13 12:46:06 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     575707,   Seg_Num: 0
POINT_RA:        290.522d {+19h 22m 05s} (J2000)
POINT_DEC:       -64.608d {-64d 36' 26"} (J2000)
ROLL:            272.562d
IMG_START_DATE:  16589 TJD;   297 DOY;   13/10/24
IMG_START_TIME:  45652.49 SOD {12:40:52.49} UT,   871.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     404311263
X_OFFSET:        968 [pixels]
Y_OFFSET:        812 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1128
Y_GRB_POS:       972
BINNING_INDEX:   1
IM_URL:          sw00575707000msuni0883.fits
SUN_POSTN:       209.13d {+13h 56m 30s}  -11.91d {-11d 54' 51"}
SUN_DIST:         75.70 [deg]   Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN:       94.82d {+06h 19m 17s}  +18.90d {+18d 54' 09"}
MOON_DIST:       133.07 [deg]
MOON_ILLUM:      72 [%]
GAL_COORDS:      331.58,-27.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      281.67,-42.00 [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 #15367
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 1446 s of XRT Photon Counting mode data and 2 UVOT images for GRB 131024A, 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 = 290.48247, -64.60275 which is equivalent to:
```
RA (J2000): 19h 21m 55.79s
Dec (J2000): -64d 36' 09.9"
```
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 #15369
A. Trotter, J. Haislip, D. Reichart, A. Verveer, T. Spuck, A. LaCluyze, N. Frank, J. Moore, T. Berger, H. T. Cromartie, R. Egger, A. Foster, K. Ivarsen, M. Maples, M. Nysewander, E. Speckhard, and J. A. Crain report:
Skynet observed the Swift/XRT localization of the field of GRB 131024A (Racusin et al., GCN 15365, Swift trigger # 575707) with the 14-inch R-COP telescope at Perth Observatory, Australia, starting at 2013-10-24, 12:28:14 UT and continuing until 14:25 UT (t=1.9-118m post trigger). R-COP took a total of 44x20-80s exposures simultaneously in the BRI bands.
In a stack of 2 early R-band images at a mean time t=6.9m we marginally detect (S/N~3.5 sigma) an uncataloged source in the R band within the XRT error circle, with R~18.9 mag. In later stacks at mean times ~70-80m, we obtain only 3-sigma upper limits in all three bands:
```
band    t(mean) exp     mag
B       69m      9x80s  >19.2
R       80m     12x80s  >19.8
I       83m     16x80s  >18.9
```
Magnitudes are in the Vega system, calibrated to four APASS-DR7 stars in the field, and have not been corrected for line-of-sight Milky Way dust extinction, with expected E(B-V)=0.05 (Schlegel et al. 1998).
No further Skynet observations are scheduled.
GCN Circular #15370
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), J. L. Racusin (NASA/GSFC), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+303 sec from the recent telemetry downlink, we report further analysis of BAT GRB 131024A (trigger #575707) (Racusin, et al., GCN Circ. 15365). The BAT ground-calculated position is RA, Dec = 290.544, -64.599 deg which is
```
    RA(J2000)  =  19h 22m 10.5s
    Dec(J2000) = -64d 35' 54.8"
```
with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 78%. The burst started during a pre-planned slew. Low-level emission begins around T-150 sec. Then there is a first peak from T-70 to T-50 sec, a second peak from T-15 to T-4 sec and a third peak from T-2 to T+20 sec. We note that there is a gap in the currently available data from ~T-140 to T-120 sec. T90 (15-350 keV) is 112.00 +- 36 sec (estimated error including systematics).
The time-averaged spectrum from T-111.00 to T+17.00 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.85 +- 0.18. The fluence in the 15-150 keV band is 1.2 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-55.50 sec in the 15-150 keV band is 0.3 +- 0.1 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/575707/BA/
GCN Circular #15372
A. Maselli (INAF-IASFPA), A. Melandri (INAF-OAB), V. Mangano (PSU), M.C. Stroh (PSU), D.N. Burrows (PSU), P.A. Evans (U. Leicester), B.P. Gompertz (U. Leicester), J.P. Osborne (U. Leicester), B. Sbarufatti (INAF-OAB/PSU) and J.L. Racusin report on behalf of the Swift-XRT team:
We have analysed 6.5 ks of XRT data for GRB 131024A (Racusin et al. GCN Circ. 15365), from 151 s to 24.0 ks after the BAT trigger. The data comprise 20 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN. Circ 15367).
The light curve can be modelled with a power-law decay with a decay index of alpha=0.46 (+/-0.05).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.08 (+0.18, -0.17). The best-fitting absorption column is 7.7 (+3.7, -3.2) x 10^20 cm^-2, consistent with the Galactic value of 4.4 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 3.4 x 10^-11 (4.3 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     7.7 (+3.7, -3.2) x 10^20 cm^-2
Galactic foreground: 4.4 x 10^20 cm^-2
Excess significance: <1.6 sigma
Photon index:	     2.08 (+0.18, -0.17)
```
If the light curve continues to decay with a power-law decay index of 0.46, the count rate at T+24 hours will be 0.036 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.2 x 10^-12 (1.6 x 10^-12) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00575707.
This circular is an official product of the Swift-XRT team.
GCN Circular #15373
V. Sudilovsky, K. Varela, D. A. Kann and J. Greiner (all MPE Garching) report on behalf of the GROND team:
We observed the field of the GRB 131024A (Racusin et al., GCN #15365) simultaneously in g'r'i'z'JHKs 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 00:20 UT on 25 October 2013, 12 hours after the GRB. They were performed at an average seeing of 1.6" and at an average airmass of 1.4.
Based on two co-added observations with individual exposure times of 1500s in g'r'i'z' and 1200s in JHK, we do not detect any source with the enhanced XRT circle (Osborne et al., GCN #15367) down to preliminary limiting magnitudes (all in the AB system):
```
g' > 25.1 mag,
r' > 24.7 mag,
i' > 23.9 mag,
z' > 23.8 mag,
J > 21.6 mag,
H > 21.0 mag,
K > 20.0 mag.
```
We do note there is a marginally detected source in r' at roughly 1.6" north-east of the center of the error circle.
Magnitudes are calibrated against GROND zeropoints (griz) and 2MASS stars (JHK), and are not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.04 mag in the direction of the burst (Schlegel et al. 1998).
GCN Circular #15375
M. H. Siegel (PSU) and J. L. Racusin (NASA/GSFC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 131024A 137 s after the BAT trigger (Racusin et al., GCN Circ. 15365). No optical afterglow consistent with the enhanced XRT position (Osborne et al., GCN Circ. 15367) 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)         136          286          147         >20.63
white              136         1542          392         >21.69
v                  624         1592          116         >18.91
b                  550         1517           97         >19.75
u (fc)             294          544          245         >19.99
u                  294         1492          569         >20.49
uvw1               673         1468           97         >19.15
uvm2               648         1606          106         >18.99
uvw2               600         1567          116         >19.48
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.05 in the direction of the burst (Schlegel et al. 1998).

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Jochen Greiner, last update: 25-Oct-2013 [Disclaimer]