Gamma-ray Burst 120714B

(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 14 Jul 12 21:20:07 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     526642,   Seg_Num: 0
GRB_RA:          355.433d {+23h 41m 44s} (J2000),
                 355.599d {+23h 42m 24s} (current),
                 354.767d {+23h 39m 04s} (1950)
GRB_DEC:         -46.186d {-46d 11' 08"} (J2000),
                 -46.116d {-46d 06' 57"} (current),
                 -46.463d {-46d 27' 46"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=1964 [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:        16122 TJD;   196 DOY;   12/07/14
GRB_TIME:        76726.57 SOD {21:18:46.57} UT
GRB_PHI:         106.84 [deg]
GRB_THETA:        10.77 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    11.30 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  +1  +0  +0 +58  +0 
SUN_POSTN:       114.63d {+07h 38m 30s}  +21.51d {+21d 30' 29"}
SUN_DIST:        125.25 [deg]   Sun_angle= 7.9 [hr] (West of Sun)
MOON_POSTN:       62.40d {+04h 09m 37s}  +21.09d {+21d 05' 06"}
MOON_DIST:        90.26 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      334.23,-66.48 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      333.93,-39.80 [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 = 165.94,9.52 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 14 Jul 12 21:21:20 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     526642,   Seg_Num: 0
GRB_RA:          355.3993d {+23h 41m 35.83s} (J2000),
                 355.5656d {+23h 42m 15.75s} (current),
                 354.7337d {+23h 38m 56.09s} (1950)
GRB_DEC:         -46.1764d {-46d 10' 35.0"} (J2000),
                 -46.1068d {-46d 06' 24.5"} (current),
                 -46.4538d {-46d 27' 13.5"} (1950)
GRB_ERROR:       5.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.59e-09 [erg/cm2/sec]
GRB_SIGNIF:      7.74 [sigma]
IMG_START_DATE:  16122 TJD;   196 DOY;   12/07/14
IMG_START_TIME:  76846.67 SOD {21:20:46.67} UT,   120.1 [sec] since BAT Trigger Time
TAM[0-3]:        327.65 237.23 261.54 243.35
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       114.63d {+07h 38m 31s}  +21.51d {+21d 30' 29"}
SUN_DIST:        125.28 [deg]   Sun_angle= 7.9 [hr] (West of Sun)
MOON_POSTN:       62.42d {+04h 09m 40s}  +21.09d {+21d 05' 10"}
MOON_DIST:        90.28 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      334.29,-66.47 [deg] galactic lon,lat of the burst
ECL_COORDS:      333.91,-39.78 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.49 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 14 Jul 12 21:21:30 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     526642,   Seg_Num: 0
GRB_RA:          355.3993d {+23h 41m 35.8s} (J2000),
                 355.5656d {+23h 42m 15.7s} (current),
                 354.7337d {+23h 38m 56.0s} (1950)
GRB_DEC:         -46.1764d {-46d 10' 35.0"} (J2000),
                 -46.1068d {-46d 06' 24.5"} (current),
                 -46.4538d {-46d 27' 13.5"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       60 [cnts]
IMG_START_DATE:  16122 TJD;   196 DOY;   12/07/14
IMG_START_TIME:  76846.67 SOD {21:20:46.67} UT,   120.1 [sec] since BAT Trigger Time
CENTROID_X:      354.69,  raw= 355  [pixels]
CENTROID_Y:      301.38,  raw= 301  [pixels]
ROLL:            95.17 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   7.97
GRB_POS_XRT_Z:   120.20
IMAGE_URL:       sw00526642000msxps_rw.img
SUN_POSTN:       114.63d {+07h 38m 31s}  +21.51d {+21d 30' 29"}
SUN_DIST:        125.28 [deg]   Sun_angle= 7.9 [hr] (West of Sun)
MOON_POSTN:       62.42d {+04h 09m 40s}  +21.09d {+21d 05' 10"}
MOON_DIST:        90.28 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      334.29,-66.47 [deg] galactic lon,lat of the burst
ECL_COORDS:      333.91,-39.78 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 14 Jul 12 21:21:36 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     526642,   Seg_Num: 0
GRB_RA:          355.3993d {+23h 41m 35.8s} (J2000),
                 355.5656d {+23h 42m 15.7s} (current),
                 354.7337d {+23h 38m 56.0s} (1950)
GRB_DEC:         -46.1764d {-46d 10' 35.0"} (J2000),
                 -46.1068d {-46d 06' 24.5"} (current),
                 -46.4538d {-46d 27' 13.5"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       60 [cnts]
IMG_START_DATE:  16122 TJD;   196 DOY;   12/07/14
IMG_START_TIME:  76846.67 SOD {21:20:46.67} UT,   120.1 [sec] since BAT Trigger Time
CENTROID_X:      354.69,  raw= 355  [pixels]
CENTROID_Y:      301.38,  raw= 301  [pixels]
ROLL:            95.17 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   7.97
GRB_POS_XRT_Z:   120.20
IMAGE_URL:       sw00526642000msxps_rw.img
SUN_POSTN:       114.63d {+07h 38m 31s}  +21.51d {+21d 30' 29"}
SUN_DIST:        125.28 [deg]   Sun_angle= 7.9 [hr] (West of Sun)
MOON_POSTN:       62.42d {+04h 09m 40s}  +21.09d {+21d 05' 10"}
MOON_DIST:        90.28 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      334.29,-66.47 [deg] galactic lon,lat of the burst
ECL_COORDS:      333.91,-39.78 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 14 Jul 12 21:22:34 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     526642,   Seg_Num: 0
POINT_RA:        355.447d {+23h 41m 47s} (J2000)
POINT_DEC:       -46.181d {-46d 10' 52"} (J2000)
POINT_ROLL:      95.168d
IMG_START_DATE:  16122 TJD;   196 DOY;   12/07/14
IMG_START_TIME:  76855.95 SOD {21:20:55.95} UT,   129.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.790
N_STARS:         15
X_OFFSET:        424 [pixels]
Y_OFFSET:        624 [pixels]
X_MAX:           1383 [pixels]
Y_MAX:           1583 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00526642000msufc0129.fits
SUN_POSTN:       114.63d {+07h 38m 31s}  +21.51d {+21d 30' 28"}
SUN_DIST:        125.24 [deg]   Sun_angle= 7.9 [hr] (West of Sun)
MOON_POSTN:       62.43d {+04h 09m 42s}  +21.09d {+21d 05' 13"}
MOON_DIST:        90.26 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      334.22,-66.49 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      333.95,-39.80 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 14 Jul 12 21:22:59 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     526642,   Seg_Num: 0
POINT_RA:        355.447d {+23h 41m 47s} (J2000)
POINT_DEC:       -46.181d {-46d 10' 52"} (J2000)
POINT_ROLL:      95.168d
IMG_START_DATE:  16122 TJD;   196 DOY;   12/07/14
IMG_START_TIME:  76855.95 SOD {21:20:55.95} UT,   129.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.790
N_STARS:         15
X_OFFSET:        424 [pixels]
Y_OFFSET:        624 [pixels]
X_MAX:           1383 [pixels]
Y_MAX:           1583 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw00526642000msufc0129.fits
SUN_POSTN:       114.63d {+07h 38m 31s}  +21.51d {+21d 30' 28"}
SUN_DIST:        125.24 [deg]   Sun_angle= 7.9 [hr] (West of Sun)
MOON_POSTN:       62.43d {+04h 09m 43s}  +21.09d {+21d 05' 14"}
MOON_DIST:        90.27 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      334.22,-66.49 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      333.95,-39.80 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_srclist.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 14 Jul 12 21:24:58 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     526642,   Seg_Num: 0
POINT_RA:        355.447d {+23h 41m 47s} (J2000)
POINT_DEC:       -46.181d {-46d 10' 52"} (J2000)
ROLL:            95.168d
IMG_START_DATE:  16122 TJD;   196 DOY;   12/07/14
IMG_START_TIME:  76855.95 SOD {21:20:55.95} UT,   129.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     363993665
X_OFFSET:        571 [pixels]
Y_OFFSET:        976 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       731
Y_GRB_POS:       1136
BINNING_INDEX:   1
IM_URL:          sw00526642000msuni0139.fits
SUN_POSTN:       114.63d {+07h 38m 31s}  +21.51d {+21d 30' 27"}
SUN_DIST:        125.25 [deg]   Sun_angle= 7.9 [hr] (West of Sun)
MOON_POSTN:       62.45d {+04h 09m 47s}  +21.09d {+21d 05' 20"}
MOON_DIST:        90.28 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      334.22,-66.49 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      333.95,-39.80 [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).  
COMMENTS:        This notice was forced out after watchdog timer expiring -- most likely due to missing packet(s);  
COMMENTS:        as a consequence some of the fields may be incoorect (eg TRIGGER_NUM,RA,DEC).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 14 Jul 12 21:25:12 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     526642,   Seg_Num: 0
POINT_RA:        355.447d {+23h 41m 47s} (J2000)
POINT_DEC:       -46.181d {-46d 10' 52"} (J2000)
ROLL:            95.168d
IMG_START_DATE:  16122 TJD;   196 DOY;   12/07/14
IMG_START_TIME:  76855.95 SOD {21:20:55.95} UT,   129.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     363993665
X_OFFSET:        571 [pixels]
Y_OFFSET:        976 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       731
Y_GRB_POS:       1136
BINNING_INDEX:   1
IM_URL:          sw00526642000msuni0139.fits
SUN_POSTN:       114.63d {+07h 38m 31s}  +21.51d {+21d 30' 27"}
SUN_DIST:        125.25 [deg]   Sun_angle= 7.9 [hr] (West of Sun)
MOON_POSTN:       62.45d {+04h 09m 48s}  +21.09d {+21d 05' 21"}
MOON_DIST:        90.28 [deg]
MOON_ILLUM:      17 [%]
GAL_COORDS:      334.22,-66.49 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      333.95,-39.80 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.  
COMMENTS:        This notice was forced out after watchdog timer expiring -- most likely due to missing packet(s);  
COMMENTS:        as a consequence some of the fields may be incoorect (eg TRIGGER_NUM,RA,DEC).

GCN Circular #13471
C. J. Saxton (UCL-MSSL), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), D. N. Burrows (PSU), N. P. M. Kuin (UCL-MSSL), C. B. Markwardt (NASA/GSFC), S. R. Oates (UCL-MSSL), K. L. Page (U Leicester), D. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 21:18:46.57 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 120714B (trigger=526642). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 355.433, -46.186 deg, which is
```
   RA(J2000)  =  23h 41m 44s
   Dec(J2000) = -46d 11' 08"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). As is typical for image triggers (64 sec), the realtime TDRSS lightcurve does not show anything significant.
The XRT began observing the field at 21:20:46.6 UT, 120.1 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 355.3993, -46.1764 which is equivalent to:
```
   RA(J2000)  = +23h 41m 35.83s
   Dec(J2000) = -46d 10' 35.0"
```
with an uncertainty of 5.2 arcseconds (radius, 90% containment). This location is 90 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy.
The initial flux in the 2.5 s image was 1.59e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT results will not be available until further data are processed.
Burst Advocate for this burst is C. J. Saxton (cjs2 AT mssl.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 Circular #13473
F. E. Marshall (NASA/GSFC) and C. J. Saxton (UCL-MSSL) report on behalf of the Swift team:
The positions reported for GRB 120714B in GCN Circular 13471 are incorrect because of an unusally large attitude error on the spacecraft. Using the initial UVOT exposure, we find the corrected XRT position is:
```
  RA  (J2000) =  23h 41m 38.35s
  DEC (J2000) = -46d 11' 07"
```
There is a candidate afterglow in the initial UVOT exposure of 36 seconds starting 129 seconds after the trigger. The source has a mag of 18.6 in the white filter and is located at the following position:
```
  RA  (J2000) =  23h 41m 38.05s
  DEC (J2000) = -46d 11' 03"
```

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 15 Jul 12 00:08:56 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     526642,   Seg_Num: 0
POINT_RA:        355.455d {+23h 41m 49s} (J2000)
POINT_DEC:       -46.195d {-46d 11' 42"} (J2000)
POINT_ROLL:      95.172d
IMG_START_DATE:  16123 TJD;   197 DOY;   12/07/15
IMG_START_TIME:  361.03 SOD {00:06:01.03} UT,   10034.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.644
N_STARS:         20
X_OFFSET:        170 [pixels]
Y_OFFSET:        599 [pixels]
X_MAX:           1129 [pixels]
Y_MAX:           1558 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00526642000msufc10034.fits
SUN_POSTN:       114.75d {+07h 38m 59s}  +21.49d {+21d 29' 23"}
SUN_DIST:        125.31 [deg]   Sun_angle= 7.9 [hr] (West of Sun)
MOON_POSTN:       63.90d {+04h 15m 35s}  +21.21d {+21d 12' 48"}
MOON_DIST:        91.24 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      334.19,-66.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      333.94,-39.82 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 15 Jul 12 00:09:26 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     526642,   Seg_Num: 0
POINT_RA:        355.455d {+23h 41m 49s} (J2000)
POINT_DEC:       -46.195d {-46d 11' 42"} (J2000)
POINT_ROLL:      95.172d
IMG_START_DATE:  16123 TJD;   197 DOY;   12/07/15
IMG_START_TIME:  361.03 SOD {00:06:01.03} UT,   10034.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.644
N_STARS:         20
X_OFFSET:        170 [pixels]
Y_OFFSET:        599 [pixels]
X_MAX:           1129 [pixels]
Y_MAX:           1558 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00526642000msufc10034.fits
SUN_POSTN:       114.75d {+07h 38m 59s}  +21.49d {+21d 29' 22"}
SUN_DIST:        125.31 [deg]   Sun_angle= 7.9 [hr] (West of Sun)
MOON_POSTN:       63.90d {+04h 15m 36s}  +21.21d {+21d 12' 49"}
MOON_DIST:        91.24 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      334.19,-66.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      333.94,-39.82 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_srclist.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 15 Jul 12 00:10:14 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     526642,   Seg_Num: 0
POINT_RA:        355.455d {+23h 41m 49s} (J2000)
POINT_DEC:       -46.195d {-46d 11' 42"} (J2000)
ROLL:            95.172d
IMG_START_DATE:  16123 TJD;   197 DOY;   12/07/15
IMG_START_TIME:  361.03 SOD {00:06:01.03} UT,   10034.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     364003570
X_OFFSET:        489 [pixels]
Y_OFFSET:        918 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       649
Y_GRB_POS:       1078
BINNING_INDEX:   1
IM_URL:          sw00526642000msuni10044.fits
SUN_POSTN:       114.75d {+07h 38m 59s}  +21.49d {+21d 29' 22"}
SUN_DIST:        125.31 [deg]   Sun_angle= 7.9 [hr] (West of Sun)
MOON_POSTN:       63.91d {+04h 15m 38s}  +21.21d {+21d 12' 51"}
MOON_DIST:        91.25 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      334.19,-66.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      333.94,-39.82 [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:     Sun 15 Jul 12 00:10:31 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     526642,   Seg_Num: 0
POINT_RA:        355.455d {+23h 41m 49s} (J2000)
POINT_DEC:       -46.195d {-46d 11' 42"} (J2000)
ROLL:            95.172d
IMG_START_DATE:  16123 TJD;   197 DOY;   12/07/15
IMG_START_TIME:  361.03 SOD {00:06:01.03} UT,   10034.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     364003570
X_OFFSET:        489 [pixels]
Y_OFFSET:        918 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       649
Y_GRB_POS:       1078
BINNING_INDEX:   1
IM_URL:          sw00526642000msuni10044.fits
SUN_POSTN:       114.75d {+07h 38m 59s}  +21.49d {+21d 29' 22"}
SUN_DIST:        125.31 [deg]   Sun_angle= 7.9 [hr] (West of Sun)
MOON_POSTN:       63.91d {+04h 15m 38s}  +21.21d {+21d 12' 52"}
MOON_DIST:        91.25 [deg]
MOON_ILLUM:      16 [%]
GAL_COORDS:      334.19,-66.48 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      333.94,-39.82 [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:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN Circular #13477
J.P.U. Fynbo (DARK/NBI), A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), V. D'Elia (ASDC, INAF), D. Xu (WIS), and D. Malesani (DARK/NBI) report on behalf of the X-shooter GRB GTO collaboration:
We observed the field of GRB 120714B (Saxton et. al GCN 13471, Marshall & Saxton GCN 13473) with X-shooter at VLT (Paranal, Chile). Observations started on 15 July at 5:06 UT (7.8 hr after the burst) and consisted of a total observing time of 4800 s in each of the UVB, VIS and NIR arms, covering the range between 3000 and 18000 A.
The spectrum shows a faint continuum where we detect MgII absorption as well as emission lines of [OII], H-beta, [OIII] and H-alpha at a common redshift of z=0.3984.
We acknowledge excellent support from the ESO staff, in particular Dimitri Gadotti.
GCN Circular #13478
A. Nicuesa Guelbenzu, S. Klose (both TLS Tautenburg), and J. Greiner (MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 120714B (Swift trigger 526642; Saxton et al., GCN 13471) simultaneously in g'r'i'z'JHKs with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG/ESO telescope at La Silla Observatory (Chile).
Observations started at 3:01 UT on 2012-07-15, about 6 hrs after the GRB trigger, at a airmass of 2.2, and a mean seeing of 2.4". Based on an exposure of 460 seconds in the optical and 480 seconds in the NIR, at a mean time of 03:27 UT we detect the UVOT afterglow candidate (Marshall et al., GCN 13473) with preliminary AB magnitudes
```
  g' = 22.3 +/- 0.2
  r' = 22.1 +/- 0.2
  i' = 21.5 +/- 0.2
  z' = 20.5 +/- 0.2
  J  > 20.7
  H  > 20.1
  Ks > 19.2.
```
This suggests a fading relative to the white light magnitude of 18.6 mag as reported by Marshall et al. (GCN 13473), suggesting this to be the afterglow of GRB 120714B. Observations are ongoing.
The magnitudes are derived based on GROND zeropoints (g'r'i'z') and 2MASS stars (JHK). We note that the Galactic reddening along the line of sight is E_(B-V)= 0.01 mag (Schlegel et al. 1998).
GCN Circular #13481
J. R. Cummings (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), C. J. Saxton (UCL-MSSL), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-60 to T+243 sec from recent telemetry downlinks, we report further analysis of BAT GRB 120714B (trigger #526642) (Saxton, et al., GCN Circ. 13471). The BAT ground-calculated position is RA, Dec = 355.412, -46.196 deg, which is
```
   RA(J2000)  =  23h 41m 38.9s 
   Dec(J2000) = -46d 11' 47.3" 
```
with an uncertainty of 2.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 92%.
The mask-weighted light curve shows a broad peak starting at ~T-35 sec, peaking around T+0 sec, and ending at ~T+55 sec with a tail out to ~T+150 sec. T90 (15-350 keV) is 159 +- 34 sec (estimated error including systematics).
The time-averaged spectrum from T-23.0 to T+154.0 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.52 +- 0.17. 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-21.71 sec in the 15-150 keV band is 0.4 +- 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/526642/BA/
GCN Circular #13483
O. M. Littlejohns, K. Page (U. Leicester) & C. J. Saxton (UCL-MSSL) reports on behalf of the Swift-XRT team:
We have analysed 2.4 ks of XRT data for GRB 120714B (Saxton et al. GCN Circ. 13471), from 110 s to 75.0 ks after the BAT trigger. The data comprise 9 s in Windowed Timing (WT) mode (taken while Swift was slewing), with the remainder in Photon Counting (PC) mode.
The light curve can be modelled with a power-law decay with a decay index of alpha=1.87 (+0.13, -0.09).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.0 (+0.9, -0.6). The best-fitting absorption column is 1 (+11, -0) x 10^20 cm^-2, consistent with the Galactic value of 1.2 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 (3.6 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1 (+11, -0) x 10^20 cm^-2
Galactic foreground: 1.2 x 10^20 cm^-2
Excess significance: <1.6 sigma
Photon index:	     2.0 (+0.9, -0.6)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00526642.
This circular is an official product of the Swift-XRT team.
GCN Circular #13484
N. P. M. Kuin (MSSL-UCL), F. Marshall (NASA/GSFC), and C. J. Saxton (UCL-MSSL) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 120714B 129 s after the BAT trigger (Saxton et al., GCN Circ. 13471). The UVOT source candidate reported by Marshall and Saxton (GCN Circ. No. 13473) is found to decay.
The preliminary UVOT position is RA, Dec (J2000) = (355.40864,-46.18387), or in sexagesimal coordinates:
```
RA = 23h41m38.1s
Dec = -46d11'02"
```
with 90% confidence error radius of 0.58".
Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white              129          165           35         18.40 +/- 0.20
white            10034        10184          147        >20.8
b                10195        11102          885        >21.5
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.01 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #13613
S. Klose (TLS), J. Greiner (MPE), J. Fynbo (DARK), A. Nicuesa Guelbenzu, S. Schmidl (both TLS), A. Rau (MPE), T. Kruehler (DARK), report on behalf of a larger collaboration:
GROND has been following the afterglow of GRB 120714B (Saxton et al., GCN 13471) at z=0.398 (Fynbo et al., GCN 13477) since July 15 (Nicuesa Guelbenzu et al., GCN 13478). The light of the optical transient has been fading in all GROND optical bands during the first 1.5 days, was then flattening in r',i',z', and finally rising at about 3 days after the trigger (while it is flattening in g'). The data suggested that this behavior can be interpreted as an upcoming supernova component with a an early rise similar to the SN associated with GRB 011121 at z=0.36 (Bloom et al. 2002, ApJ 672, 45; Garnavich et al. 2003, ApJ 582, 924; Greiner et al. 2003, ApJ 599, 1223; Price et al. 2002, ApJ 572, 51).
Spectroscopy of the optical transient with VLT/FORS2 was performed on August 1/2, 18.3 days after the burst. Observations were done with the 300V grism, covering the wavelength range from 445 to 865 nm, and lasted 7200 sec. The spectrum reveals very broad features in the continuum with a prominent peak around 6500 A and broad lines of Si II and Ca II, in agreement with a broad-lined SN dominating the light of the optical transient. At present a decision between type Ib and Ic cannot be performed due to an uncomfortable presence of atmospheric features in the spectrum.
We thank the staff at ESO Paranal and ESO Garching for their excellent support and for performing the spectroscopy. GROND observations are continuing.
CBET 3200
SUPERNOVA 2012eb = GRB 120714B
A gamma-ray burst designated GRB 120714B was announced on GCN Circular 13471 (posted at website URL http://gcn.gsfc.nasa.gov/gcn3/13471.gcn3) by C. J. Saxton et al.; it was detected on July 14.888 UT by the Swift Burst Alert Telescope (BAT); the Swift/XRT position for the source was given on GCN Circular 13473 as R.A. = 23h41m38s.35, Decl. = -46d11'07" (equinox 2000.0), with the UVOT white-filter magnitude given as 18.6 with position end figures 38s.05, 03". By July 15.126, the afterglow of GRB 120714B had faded to magnitude g' about 22.3 (GCN Circular 13478).
Sylvio Klose, Thueringer Landessternwarte (TLS), Tautenburg; J. Greiner, Max Planck Institute for extraterrestrial Physics, Garching, (MPE); J. Fynbo, DARK Cosmology Centre, Niels Bohr Institute, University of Copenhagen; A. Nicuesa Guelbenzu and S. Schmidl, TLS; A. Rau, MPE; and T. Kruehler, DARK Cosmology Centre, on behalf of a larger collaboration, report that the Gamma Ray Burst Oprical Near Infrared Detector (GROND; a 7-channel imager mounted at the 2.2-m ESO/MPG telescope at La Silla; cf. Greiner et al. 2008, PASP 120, 405) has been following the afterglow of GRB 120714B (Saxton et al., GCN Circ. 13471) at z = 0.398 (Fynbo et al., GCN Circ. 13477) since July 15 (Nicuesa Guelbenzu et al., GCN Circ. 13478). The light of the optical transient has been fading in all GROND optical bands during the first 1.5 days, was then flattening in r', i', and z' bands, and finally rising atabout three days after the trigger (while it is flattening in g'). The data suggested that this behavior can be interpreted as an upcoming supernova component with a an early rise similar to the supernova associated with GRB 011121 at z = 0.36 (Bloom et al. 2002, Ap.J. 672, 45; Garnavich et al. 2003, Ap.J. 582, 924; Greiner et al. 2003, Ap.J. 599, 1223; Price et al. 2002, Ap.J. 572, 51).
Spectroscopy of the optical transient with the Very Large Telescope (+ FORS2) was performed on Aug. 1/2, or 18.3 days after the burst. Observations were done with the 300V grism, covering the wavelength range from 445 to 865 nm, and lasted 7200 s. The spectrum reveals very broad features in the continuum, with a prominent peak around 650.0 nm and broad lines of Si II and Ca II, in agreement with a broad-lined supernova dominating the light of the optical transient. At present, a decision between type Ib and Ic events cannot be performed due to an uncomfortable presence of atmospheric features in the spectrum.

Back to JG's homepage

Jochen Greiner, last update: 09-Aug-2012 [Disclaimer]