Gamma-ray Burst 130701A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 01 Jul 13 04:18:02 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     559482,   Seg_Num: 0
GRB_RA:          357.216d {+23h 48m 52s} (J2000),
                 357.386d {+23h 49m 33s} (current),
                 356.586d {+23h 46m 21s} (1950)
GRB_DEC:         +36.099d {+36d 05' 58"} (J2000),
                 +36.174d {+36d 10' 28"} (current),
                 +35.821d {+35d 49' 17"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       7972 [cnts]    Image_Peak=1234 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   148     E_range: 25-100 keV
BKG_INTEN:       17667 [cnts]
BKG_TIME:        15445.26 SOD {04:17:25.26} UT
BKG_DUR:         8 [sec]
GRB_DATE:        16474 TJD;   182 DOY;   13/07/01
GRB_TIME:        15463.63 SOD {04:17:43.63} UT
GRB_PHI:         -130.20 [deg]
GRB_THETA:        41.16 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     135.14 [sigma]
IMAGE_SIGNIF:    22.22 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +7  +0  +0  -6  +0 
SUN_POSTN:       100.34d {+06h 41m 23s}  +23.10d {+23d 05' 46"}
SUN_DIST:         86.27 [deg]   Sun_angle= 6.9 [hr] (West of Sun)
MOON_POSTN:       18.63d {+01h 14m 30s}  +10.28d {+10d 16' 37"}
MOON_DIST:        32.26 [deg]
MOON_ILLUM:      40 [%]
GAL_COORDS:      109.01,-25.08 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       13.81, 33.79 [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 = 300.28,8.33 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Mon 01 Jul 13 04:18:38 UT 
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    6878,   Sub_Num: 0
GRB_INTEN:      9.58 [sigma]   
GRB_TIME:       15461.69 SOD {04:17:41.69} UT
GRB_DATE:       16474 TJD;   182 DOY;   13/07/01
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.
COMMENTS:       Time_Scale=2.0000 and Time_Error=1.0000.
COMMENTS:
COMMENTS:       NOTE: This SPIACS event is temporally(2.0<100sec) coincident with the SWIFT_BAT event (trignum=559482).
COMMENTS:
COMMENTS:       The SPIACS lightcurve can be found at:
COMMENTS:       ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2013-07/2013-07-01T04-17-41.4584-31228-15248-0.lc

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 01 Jul 13 04:19:42 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     559482,   Seg_Num: 0
GRB_RA:          357.2287d {+23h 48m 54.88s} (J2000),
                 357.3991d {+23h 49m 35.77s} (current),
                 356.5991d {+23h 46m 23.77s} (1950)
GRB_DEC:         +36.0997d {+36d 05' 58.9"} (J2000),
                 +36.1748d {+36d 10' 29.1"} (current),
                 +35.8217d {+35d 49' 18.1"} (1950)
GRB_ERROR:       5.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.36e-09 [erg/cm2/sec]
GRB_SIGNIF:      7.93 [sigma]
IMG_START_DATE:  16474 TJD;   182 DOY;   13/07/01
IMG_START_TIME:  15549.10 SOD {04:19:09.10} UT,   85.5 [sec] since BAT Trigger Time
TAM[0-3]:        327.67 237.24 261.53 243.62
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       100.35d {+06h 41m 23s}  +23.10d {+23d 05' 46"}
SUN_DIST:         86.26 [deg]   Sun_angle= 6.9 [hr] (West of Sun)
MOON_POSTN:       18.64d {+01h 14m 33s}  +10.28d {+10d 16' 52"}
MOON_DIST:        32.26 [deg]
MOON_ILLUM:      40 [%]
GAL_COORDS:      109.02,-25.08 [deg] galactic lon,lat of the burst
ECL_COORDS:       13.82, 33.79 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.63 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 01 Jul 13 04:20:05 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     559482,   Seg_Num: 0
GRB_RA:          357.2287d {+23h 48m 54.8s} (J2000),
                 357.3991d {+23h 49m 35.7s} (current),
                 356.5991d {+23h 46m 23.7s} (1950)
GRB_DEC:         +36.0997d {+36d 05' 58.9"} (J2000),
                 +36.1748d {+36d 10' 29.1"} (current),
                 +35.8217d {+35d 49' 18.1"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       63 [cnts]
IMG_START_DATE:  16474 TJD;   182 DOY;   13/07/01
IMG_START_TIME:  15549.10 SOD {04:19:09.10} UT,   85.5 [sec] since BAT Trigger Time
CENTROID_X:      275.07,  raw= 275  [pixels]
CENTROID_Y:      285.96,  raw= 286  [pixels]
ROLL:            63.81 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -28.38
GRB_POS_XRT_Z:   -67.47
IMAGE_URL:       sw00559482000msxps_rw.img
SUN_POSTN:       100.35d {+06h 41m 23s}  +23.10d {+23d 05' 46"}
SUN_DIST:         86.26 [deg]   Sun_angle= 6.9 [hr] (West of Sun)
MOON_POSTN:       18.64d {+01h 14m 34s}  +10.28d {+10d 16' 56"}
MOON_DIST:        32.26 [deg]
MOON_ILLUM:      40 [%]
GAL_COORDS:      109.02,-25.08 [deg] galactic lon,lat of the burst
ECL_COORDS:       13.82, 33.79 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 01 Jul 13 04:21:51 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     559482,   Seg_Num: 0
GRB_RA:          357.216d {+23h 48m 52s} (J2000),
                 357.386d {+23h 49m 33s} (current),
                 356.586d {+23h 46m 21s} (1950)
GRB_DEC:         +36.099d {+36d 05' 58"} (J2000),
                 +36.174d {+36d 10' 28"} (current),
                 +35.821d {+35d 49' 17"} (1950)
GRB_DATE:        16474 TJD;   182 DOY;   13/07/01
GRB_TIME:        15463.63 SOD {04:17:43.63} UT
TRIGGER_INDEX:   148
GRB_PHI:         -130.20 [deg]
GRB_THETA:        41.16 [deg]
DELTA_TIME:      -76.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     135.14 [sigma]
IMAGE_SIGNIF:    22.22 [sigma]
LC_URL:          sw00559482000msb.lc
SUN_POSTN:       100.35d {+06h 41m 23s}  +23.10d {+23d 05' 46"}
SUN_DIST:         86.27 [deg]   Sun_angle= 6.9 [hr] (West of Sun)
MOON_POSTN:       18.66d {+01h 14m 38s}  +10.29d {+10d 17' 12"}
MOON_DIST:        32.27 [deg]
MOON_ILLUM:      40 [%]
GAL_COORDS:      109.01,-25.08 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       13.81, 33.79 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is 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 = 300.28,8.33 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 01 Jul 13 04:24:54 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     559482,   Seg_Num: 0
POINT_RA:        357.202d {+23h 48m 48s} (J2000)
POINT_DEC:       +36.097d {+36d 05' 48"} (J2000)
POINT_ROLL:      63.813d
IMG_START_DATE:  16474 TJD;   182 DOY;   13/07/01
IMG_START_TIME:  15614.30 SOD {04:20:14.30} UT,   150.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.325
N_STARS:         190
X_OFFSET:        0 [pixels]
Y_OFFSET:        0 [pixels]
X_MAX:           2047 [pixels]
Y_MAX:           2047 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00559482000msufc0150.fits
SUN_POSTN:       100.35d {+06h 41m 24s}  +23.10d {+23d 05' 45"}
SUN_DIST:         86.29 [deg]   Sun_angle= 6.9 [hr] (West of Sun)
MOON_POSTN:       18.68d {+01h 14m 44s}  +10.29d {+10d 17' 41"}
MOON_DIST:        32.28 [deg]
MOON_ILLUM:      40 [%]
GAL_COORDS:      109.00,-25.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       13.80, 33.80 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 01 Jul 13 04:25:25 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     559482,   Seg_Num: 0
POINT_RA:        357.202d {+23h 48m 48s} (J2000)
POINT_DEC:       +36.097d {+36d 05' 48"} (J2000)
POINT_ROLL:      63.813d
IMG_START_DATE:  16474 TJD;   182 DOY;   13/07/01
IMG_START_TIME:  15614.30 SOD {04:20:14.30} UT,   150.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.325
N_STARS:         190
X_OFFSET:        0 [pixels]
Y_OFFSET:        0 [pixels]
X_MAX:           2047 [pixels]
Y_MAX:           2047 [pixels]
DET_THRESH:      6
PHOTO_THRESH:    2
SL_URL:          sw00559482000msufc0150.fits
SUN_POSTN:       100.35d {+06h 41m 24s}  +23.10d {+23d 05' 45"}
SUN_DIST:         86.29 [deg]   Sun_angle= 6.9 [hr] (West of Sun)
MOON_POSTN:       18.69d {+01h 14m 45s}  +10.30d {+10d 17' 46"}
MOON_DIST:        32.28 [deg]
MOON_ILLUM:      40 [%]
GAL_COORDS:      109.00,-25.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       13.80, 33.80 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 01 Jul 13 04:26:03 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     559482,   Seg_Num: 0
POINT_RA:        357.202d {+23h 48m 48s} (J2000)
POINT_DEC:       +36.097d {+36d 05' 48"} (J2000)
ROLL:            63.813d
IMG_START_DATE:  16474 TJD;   182 DOY;   13/07/01
IMG_START_TIME:  15614.30 SOD {04:20:14.30} UT,   150.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     394345225
X_OFFSET:        949 [pixels]
Y_OFFSET:        846 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1109
Y_GRB_POS:       1006
BINNING_INDEX:   1
IM_URL:          sw00559482000msuni0161.fits
SUN_POSTN:       100.35d {+06h 41m 24s}  +23.10d {+23d 05' 45"}
SUN_DIST:         86.29 [deg]   Sun_angle= 6.9 [hr] (West of Sun)
MOON_POSTN:       18.69d {+01h 14m 46s}  +10.30d {+10d 17' 52"}
MOON_DIST:        32.29 [deg]
MOON_ILLUM:      40 [%]
GAL_COORDS:      109.00,-25.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       13.80, 33.80 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 01 Jul 13 04:26:20 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     559482,   Seg_Num: 0
POINT_RA:        357.202d {+23h 48m 48s} (J2000)
POINT_DEC:       +36.097d {+36d 05' 48"} (J2000)
ROLL:            63.813d
IMG_START_DATE:  16474 TJD;   182 DOY;   13/07/01
IMG_START_TIME:  15614.30 SOD {04:20:14.30} UT,   150.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     394345225
X_OFFSET:        949 [pixels]
Y_OFFSET:        846 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1109
Y_GRB_POS:       1006
BINNING_INDEX:   1
IM_URL:          sw00559482000msuni0161.fits
SUN_POSTN:       100.35d {+06h 41m 24s}  +23.10d {+23d 05' 45"}
SUN_DIST:         86.29 [deg]   Sun_angle= 6.9 [hr] (West of Sun)
MOON_POSTN:       18.70d {+01h 14m 47s}  +10.30d {+10d 17' 55"}
MOON_DIST:        32.29 [deg]
MOON_ILLUM:      40 [%]
GAL_COORDS:      109.00,-25.07 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       13.80, 33.80 [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 #14953
N. P. M. Kuin (UCL-MSSL), D. Malesani (DARK/NBI), K. L. Page (U Leicester), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU/NASA/GSFC) and T. N. Ukwatta (MSU) report on behalf of the Swift Team:
At 04:17:43 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 130701A (trigger=559482). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 357.216, +36.099 which is
```
   RA(J2000) = 23h 48m 52s
   Dec(J2000) = +36d 05' 58"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a double-peaked structure with a duration of about 8 sec. The peak count rate was ~10304 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began observing the field at 04:19:09.1 UT, 85.5 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 357.2287, 36.0997 which is equivalent to:
```
   RA(J2000)  = +23h 48m 54.89s
   Dec(J2000) = +36d 05' 58.9"
```
with an uncertainty of 5.3 arcseconds (radius, 90% containment). This location is 37 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.
UVOT took a finding chart exposure of 250 seconds with the U filter starting 150 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 19.2 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 18.0 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.09.
Burst Advocate for this burst is N. P. M. Kuin (n.kuin AT ucl.ac.uk). 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:     Mon 01 Jul 13 05:08:38 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     559482,   Seg_Num: 0
GRB_RA:          357.2275d {+23h 48m 54.60s} (J2000),
                 357.3979d {+23h 49m 35.48s} (current),
                 356.5979d {+23h 46m 23.48s} (1950)
GRB_DEC:         +36.1003d {+36d 06' 01.0"} (J2000),
                 +36.1754d {+36d 10' 31.2"} (current),
                 +35.8223d {+35d 49' 20.2"} (1950)
GRB_ERROR:       3.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16474 TJD;   182 DOY;   13/07/01
IMG_START_TIME:  16955.00 SOD {04:42:35.00} UT,   1491.4 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       100.38d {+06h 41m 31s}  +23.09d {+23d 05' 38"}
SUN_DIST:         86.29 [deg]   Sun_angle= 6.9 [hr] (West of Sun)
MOON_POSTN:       19.05d {+01h 16m 13s}  +10.41d {+10d 24' 31"}
MOON_DIST:        32.38 [deg]
MOON_ILLUM:      40 [%]
GAL_COORDS:      109.02,-25.08 [deg] galactic lon,lat of the burst
ECL_COORDS:       13.82, 33.79 [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:        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:     Mon 01 Jul 13 04:19:56 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     559482,   Seg_Num: 0
GRB_RA:          357.2287d {+23h 48m 54.8s} (J2000),
                 357.3991d {+23h 49m 35.7s} (current),
                 356.5991d {+23h 46m 23.7s} (1950)
GRB_DEC:         +36.0997d {+36d 05' 58.9"} (J2000),
                 +36.1748d {+36d 10' 29.1"} (current),
                 +35.8217d {+35d 49' 18.1"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       63 [cnts]
IMG_START_DATE:  16474 TJD;   182 DOY;   13/07/01
IMG_START_TIME:  15549.10 SOD {04:19:09.10} UT,   85.5 [sec] since BAT Trigger Time
CENTROID_X:      275.07,  raw= 275  [pixels]
CENTROID_Y:      285.96,  raw= 286  [pixels]
ROLL:            63.81 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -28.38
GRB_POS_XRT_Z:   -67.47
IMAGE_URL:       sw00559482000msxps_rw.img
SUN_POSTN:       100.35d {+06h 41m 23s}  +23.10d {+23d 05' 46"}
SUN_DIST:         86.26 [deg]   Sun_angle= 6.9 [hr] (West of Sun)
MOON_POSTN:       18.64d {+01h 14m 34s}  +10.28d {+10d 16' 54"}
MOON_DIST:        32.26 [deg]
MOON_ILLUM:      40 [%]
GAL_COORDS:      109.02,-25.08 [deg] galactic lon,lat of the burst
ECL_COORDS:       13.82, 33.79 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN Circular #14954
G. Leloudas (OKC, Stockholm and DARK/NBI), N. R. Tanvir (Univ. Leicester), D. Xu (DARK/NBI), D. Malesani (DARK/NBI), P. Jakobsson (Univ. Iceland), O. Smirnova (NOT and Univ. Latvia), M. G. Pedersen (Univ. Aarhus), report:
We observed the field of GRB 130701A (Kuin et al., GCN 14953) with the NOT equipped with the ALFOSC camera. Observations were carried out in the R band and started on 2013 Jul 1.198 UT (28 min after the GRB). We detect a new object not visible in the DSS and SDSS surveys, at coordinates:
```
RA(J2000) = 23:48:55.09
Dec(J2000) = +36:06:01.4
```
The object had a magnitude R = 17.55 at 04:49 UT, calibrated against SDSS stars converted to Johnson R. The source decayed by 0.25 mag by 04:58 UT, hence confirming it is the afterglow of GRB 130701A.
GCN Circular #14955
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 687 s of XRT Photon Counting mode data and 2 UVOT images for GRB 130701A, 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 = 357.22942, +36.10058 which is equivalent to:
```
RA (J2000): 23h 48m 55.06s
Dec (J2000): +36d 06' 02.1"
```
with an uncertainty of 2.0 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 #14956
D. Xu (DARK/NBI), A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), D. Malesani (DARK/NBI), P. Vreeswijk (Weizmann), V. D'Elia (INAF-OAR, ASI-ASDC), J. P. U. Fynbo (DARK/NBI), B. Milvang-Jensen (DARK/NBI), H. Flores (GEPI/Obs. de Paris), O. Hartoog (Amsterdam), P. Goldoni (APC, CEA/Irfu), L. Kaper (Amsterdam), S. D. Vergani (CNRS/GEPI)
We observed the afterglow of GRB 130701A (Kuin et al. GCN 14953, Leloudas et al. GCN 14954) with VLT/X-shooter, beginning at 2013-07-01 09:45 UT, about 5.5 hours after the burst. We obtained 2 spectra of 600s each, covering the wavelength range 3000-21000A.
From the acquisition image (Jul 1.404 UT, 5.40 hr after the GRB) we obtain a magnitude of R = 19.9 using the same calibration as in Leloudas et al. (GCN 14954).
Preliminary analysis of the spectrum reveals absorption lines of FeII 2344, 2374, 2382, MgII 2796, 2803, MgI 2852, CaII 3934, 3969 at a common redshift of z=1.155. We propose this to be the redshift of the GRB.
We thank the staff at Paranal, particularly Jonathan Smoker and Nestor Jimenez, for obtaining these observations.
GCN Circular #14957
A. A. Breeveld (MSSL-UCL) and N. P. M. Kuin (UCL-MSSL) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 130701A with the u filter 151 s after the BAT trigger (Kuin et al., GCN Circ.=20 14953). A source consistent with the enhanced XRT position (Beardmore et al.,=20 GCN Circ. 14955) and NOT position (Leloudas et al., GCN Circ. 14954) is=20 detected in the initial UVOT exposures. There is a faint USNO-B1 source=20 2.16" away (USNO-B1 1261-054544, with B2 mag of 21.10) which perhaps=20 could be the host galaxy for the GRB.
Preliminary detections using the UVOT photometric system (Breeveld et=20 al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

u_FC               151          400          246         15.52 =B1 0.1
v                 5950         6150          197         19.04 =B1 0.2
b                 5538         5737          197         19.66 =B1 0.2
w2                5744         5944          197         20.07 =B1 0.4
```
The magnitudes in the table are not corrected for the Galactic=20 extinction due to the reddening of E(B-V) =3D 0.09 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #14958
S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline, on behalf of the Konus-Wind team, report:
The long-duration, soft-spectrum GRB 130701A (Swift-BAT trigger 559482: Kuin, et al., GCN 14953) triggered Konus-Wind at T0=3D15462.161 s UT (04:17:42.161)
The light curve shows a multi-peaked pulse from ~T0-0.5 s to ~T0+5 s. The emission is seen up to 0.5 MeV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB130701_T15462/
As observed by Konus-Wind, the burst had a fluence of (5.8 =B1 0.2)x10-6 erg/cm2, and a 64-ms peak flux, measured from T0+0.896 s, of (4.3 =B1 0.4)x10-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 1.2 MeV range by the cutoff power law with the following model parameters: the photon index alpha =3D -1.1 =B1 0.1, the peak energy Ep =3D 89 =B1 4 keV, chi2 =3D 55.1/60 dof.
Assuming z=3D1.155 (Xu, et al., GCN 14956), and a standard cosmology model with H_0 =3D 70 km/s/Mpc, Omega_M =3D 0.27, and Omega_Lambda =3D 0.73, we estimate the following rest-frame parameters of the burst: the isotropic energy release E_iso ~ 2.1x10^52 erg, the peak luminosity (L_iso)_max ~ 3.3x10^52 erg/s, and the rest-frame peak energy Ep,i ~ 190 keV
All the quoted results are preliminary.
GCN Circular #14959
T. Sakamoto (AGU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), N. P. M. Kuin (UCL-MSSL), A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC), D. M. Palmer (LANL), G. Sato (ISAS), 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+349 sec from the recent telemetry downlink, we report further analysis of BAT GRB 130701A (trigger #559482) (Kuin, et al., GCN Circ. 14953). The BAT ground-calculated position is RA, Dec = 357.224, 36.100 deg which is
```
   RA(J2000)  =  23h 48m 53.7s
   Dec(J2000) = +36d 05' 58.4"
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 28%.
BAT mask-weighted light curve shows overlapping two-peak structure starting from T-1 sec with first peak around T+1 sec and second peak around T+3 sec. The episode ends around T+5 sec. T90 (15-350 keV) is 4.38 +- 0.25 sec (estimated error including systematics).
The time-averaged spectrum from T-1.14 to T+5.35 sec is best fit by a power law with an exponential cutoff. This fit gives a photon index 0.90 +- 0.21, and Epeak of 89.2 +- 12.4 keV (chi squared 40.06 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 4.4 +- 0.1 x 10^-06 erg/cm2 and the 1-sec peak flux measured from T+0.06 sec in the 15-150 keV band is 17.1 +- 0.7 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.58 +- 0.05 (chi squared 76.39 for 57 d.o.f.). 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/559482/BA/
GCN Circular #14960
S. B. Cenko (NASA/GSFC) and D. A. Perley (Caltech) report on behalf of a larger collaboration:
We have observed the location of the Swift GRB130701A (Kuin et al., GCN 14953) with the robotic Palomar 60 inch telescope. Observations were obtained in non-photometric conditions in the r', i', and z' filters beginning at 06:52 UT on 2013 July 1 (2.58 hr after the Swift trigger). Using nearby point sources from SDSS for photometric calibration, we measure afterglow magnitudes of r' = 19.57 +/- 0.12 and i' = 19.36 +/- 0.10 at approximately this time. Compared with the earlier detection from the NOT (Leloudas et al., GCN 14954), this implies a power-law decay index of alpha ~ 1.0.
GCN Circular #14961
M.C. Stroh (PSU), D.N. Burrows (PSU), K.L. Page (U. Leicester), C. Pagani (U. Leicester), A.P. Beardmore (U. Leicester), A. Maselli (INAF-IASFPA), V. Mangano (INAF-IASFPA), A. Melandri (INAF-OAB), J.A. Kennea (PSU) and N.P.M. Kuin report on behalf of the Swift-XRT team:
We have analysed 7.6 ks of XRT data for GRB 130701A (Kuin et al. GCN Circ. 14953), from 91 s to 36.5 ks after the BAT trigger. The data comprise 214 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN. Circ 14955).
The light curve can be modelled with an initial power-law decay with an index of alpha=1.02 (+0.03, -0.06), followed by a break at T+2249 s to an alpha of 1.38 (+0.10, -0.08).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.19 (+/-0.10). The best-fitting absorption column is 1.29 (+0.22, -0.20) x 10^21 cm^-2, in excess of the Galactic value of 6.9 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 1.97 (+0.16, -0.15) and a best-fitting absorption column of 1.3 (+/-0.4) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.8 x 10^-11 (5.0 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.3 (+/-0.4) x 10^21 cm^-2
Galactic foreground: 6.9 x 10^20 cm^-2
Excess significance: 2.8 sigma
Photon index:	     1.97 (+0.16, -0.15)
```
If the light curve continues to decay with a power-law decay index of 1.38, the count rate at T+24 hours will be 7.5 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.8 x 10^-13 (3.8 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/00559482.
This circular is an official product of the Swift-XRT team.
GCN Circular #14963
T. Yoshii, K. Ito, Y. Saito, Y. Yano, R. Usui, Y. Tachibana, S. Kurita, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 130701A (N. P. M. Kuin et al., GCNC 14953) with the optical three color (g, Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan.
The observation started on 2013-07-01 14:33:09 UT ( ~10.3 h after the burst). And we could not find any new point source within the XRT error circle (N. P. M. Kuin et al., GCNC 14953) in all the three bands.
The results of photometry (3 sigma upper limits) are listed below. We used GSC2.3 catalog for flux calibration.
```
band     T0+[hour]     MID-UT        T-EXP[sec]     magnitude
--------------------------------------------------------------------------------------------
g'             ~13.0           17:19:49         1680               >19.2
Rc           ~13.1           17:24:36         2880               >18.9
Ic             ~13.0           17:17:28         1320              >18.0
--------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst [hour]
T-EXP: Total Exposure time [sec]
```

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Jochen Greiner, last update: 02-Jul-2013 [Disclaimer]