Gamma-ray Burst 120728A

(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 28 Jul 12 22:26:24 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     529021,   Seg_Num: 0
GRB_RA:          137.100d {+09h 08m 24s} (J2000),
                 137.194d {+09h 08m 47s} (current),
                 136.724d {+09h 06m 54s} (1950)
GRB_DEC:         -54.437d {-54d 26' 13"} (J2000),
                 -54.489d {-54d 29' 18"} (current),
                 -54.234d {-54d 14' 01"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       54833 [cnts]    Image_Peak=764 [image_cnts]
TRIGGER_DUR:     12.160 [sec] 
TRIGGER_INDEX:   478     E_range: 25-100 keV
BKG_INTEN:       259288 [cnts]
BKG_TIME:        80614.52 SOD {22:23:34.52} UT
BKG_DUR:         64 [sec]
GRB_DATE:        16136 TJD;   210 DOY;   12/07/28
GRB_TIME:        80711.03 SOD {22:25:11.03} UT
GRB_PHI:         172.11 [deg]
GRB_THETA:        51.82 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     19.10 [sigma]
IMAGE_SIGNIF:    11.23 [sigma]
MERIT_PARAMS:     +1  +0  +0  +4  +2  +1  +0  +1 -28  +0 
SUN_POSTN:       128.60d {+08h 34m 25s}  +18.72d {+18d 42' 56"}
SUN_DIST:         73.57 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
MOON_POSTN:      248.75d {+16h 34m 59s}  -21.26d {-21d 15' 38"}
MOON_DIST:        84.47 [deg]
MOON_ILLUM:      78 [%]
GAL_COORDS:      274.09, -4.57 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      174.68,-64.67 [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 = 206.97,-5.45 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(1.0<100sec) coincident with the FERMI_GBM event (trignum=365207115).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 28 Jul 12 22:25:24 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     365207115
GRB_RA:          167.050d {+11h 08m 12s} (J2000),
                 167.195d {+11h 08m 47s} (current),
                 166.474d {+11h 05m 54s} (1950)
GRB_DEC:         -45.683d {-45d 40' 59"} (J2000),
                 -45.752d {-45d 45' 05"} (current),
                 -45.412d {-45d 24' 43"} (1950)
GRB_ERROR:       21.02 [deg radius, statistical plus systematic]
GRB_INTEN:       117 [cnts/sec]
DATA_SIGNIF:     6.50 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        16136 TJD;   210 DOY;   12/07/28
GRB_TIME:        80712.74 SOD {22:25:12.74} UT
GRB_PHI:         337.00 [deg]
GRB_THETA:       120.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.72
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   2%  Generic Transient
DETECTORS:       0,0,0, 0,1,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       128.60d {+08h 34m 25s}  +18.72d {+18d 42' 57"}
SUN_DIST:         73.34 [deg]   Sun_angle= -2.6 [hr] (East of Sun)
MOON_POSTN:      248.74d {+16h 34m 57s}  -21.26d {-21d 15' 36"}
MOON_DIST:        69.18 [deg]
MOON_ILLUM:      78 [%]
GAL_COORDS:      284.70, 13.50 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      191.70,-45.95 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 125.85,0.35 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 28 Jul 12 22:26:33 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     365207115
GRB_RA:          131.800d {+08h 47m 12s} (J2000),
                 131.881d {+08h 47m 31s} (current),
                 131.478d {+08h 45m 55s} (1950)
GRB_DEC:         -56.910d {-56d 54' 35"} (J2000),
                 -56.957d {-56d 57' 23"} (current),
                 -56.725d {-56d 43' 29"} (1950)
GRB_ERROR:       5.55 [deg radius, statistical only]
DATA_SIGNIF:     11.90 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        16136 TJD;   210 DOY;   12/07/28
GRB_TIME:        80712.74 SOD {22:25:12.74} UT
GRB_PHI:         312.00 [deg]
GRB_THETA:       111.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4143 (Gnd S/W Version number)
SUN_POSTN:       128.60d {+08h 34m 25s}  +18.72d {+18d 42' 56"}
SUN_DIST:         75.72 [deg]   Sun_angle= -0.2 [hr] (East of Sun)
MOON_POSTN:      248.75d {+16h 35m 00s}  -21.26d {-21d 15' 38"}
MOON_DIST:        85.74 [deg]
MOON_ILLUM:      78 [%]
GAL_COORDS:      274.05, -8.45 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      173.70,-68.52 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(1.0<100sec) coincident with the SWIFT_BAT event (trignum=529021).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 28 Jul 12 22:27:49 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     529021,   Seg_Num: 0
POINT_RA:        137.113d {+09h 08m 27s} (J2000)
POINT_DEC:       -54.451d {-54d 27' 01"} (J2000)
IMG_START_DATE:  16136 TJD;   210 DOY;   12/07/28
IMG_START_TIME:  80858.84 SOD {22:27:38.84} UT,   147.8 [sec] since BAT Trigger Time
COUNTS:          8    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        1    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 28 Jul 12 22:29:12 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     529021,   Seg_Num: 0
GRB_RA:          137.100d {+09h 08m 24s} (J2000),
                 137.194d {+09h 08m 47s} (current),
                 136.724d {+09h 06m 54s} (1950)
GRB_DEC:         -54.437d {-54d 26' 13"} (J2000),
                 -54.489d {-54d 29' 18"} (current),
                 -54.234d {-54d 14' 01"} (1950)
GRB_DATE:        16136 TJD;   210 DOY;   12/07/28
GRB_TIME:        80711.03 SOD {22:25:11.03} UT
TRIGGER_INDEX:   478
GRB_PHI:         172.11 [deg]
GRB_THETA:        51.82 [deg]
DELTA_TIME:      -50.00 [sec]
TRIGGER_DUR:     12.160 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     19.10 [sigma]
IMAGE_SIGNIF:    11.23 [sigma]
LC_URL:          sw00529021000msb.lc
SUN_POSTN:       128.61d {+08h 34m 25s}  +18.72d {+18d 42' 55"}
SUN_DIST:         73.57 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
MOON_POSTN:      248.78d {+16h 35m 07s}  -21.26d {-21d 15' 44"}
MOON_DIST:        84.49 [deg]
MOON_ILLUM:      78 [%]
GAL_COORDS:      274.09, -4.57 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      174.68,-64.67 [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 = 206.97,-5.45 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 28 Jul 12 22:31:52 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     529021,   Seg_Num: 0
GRB_RA:          137.0941d {+09h 08m 22.58s} (J2000),
                 137.1885d {+09h 08m 45.24s} (current),
                 136.7186d {+09h 06m 52.47s} (1950)
GRB_DEC:         -54.4378d {-54d 26' 16.0"} (J2000),
                 -54.4891d {-54d 29' 20.8"} (current),
                 -54.2345d {-54d 14' 04.1"} (1950)
GRB_ERROR:       4.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16136 TJD;   210 DOY;   12/07/28
IMG_START_TIME:  80880.00 SOD {22:28:00.00} UT,   169.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       128.61d {+08h 34m 26s}  +18.71d {+18d 42' 53"}
SUN_DIST:         73.57 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
MOON_POSTN:      248.81d {+16h 35m 13s}  -21.26d {-21d 15' 49"}
MOON_DIST:        84.50 [deg]
MOON_ILLUM:      78 [%]
GAL_COORDS:      274.09, -4.57 [deg] galactic lon,lat of the burst
ECL_COORDS:      174.68,-64.67 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 28 Jul 12 22:32:21 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     529021,   Seg_Num: 0
POINT_RA:        137.113d {+09h 08m 27s} (J2000)
POINT_DEC:       -54.450d {-54d 27' 01"} (J2000)
POINT_ROLL:      351.596d
IMG_START_DATE:  16136 TJD;   210 DOY;   12/07/28
IMG_START_TIME:  80859.57 SOD {22:27:39.57} UT,   148.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.778
N_STARS:         190
X_OFFSET:        293 [pixels]
Y_OFFSET:        217 [pixels]
X_MAX:           1732 [pixels]
Y_MAX:           1656 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00529021000msufc0148.fits
SUN_POSTN:       128.61d {+08h 34m 26s}  +18.71d {+18d 42' 53"}
SUN_DIST:         73.59 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
MOON_POSTN:      248.81d {+16h 35m 15s}  -21.26d {-21d 15' 50"}
MOON_DIST:        84.49 [deg]
MOON_ILLUM:      78 [%]
GAL_COORDS:      274.11, -4.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      174.72,-64.67 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 28 Jul 12 22:32:41 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     529021,   Seg_Num: 0
POINT_RA:        137.113d {+09h 08m 27s} (J2000)
POINT_DEC:       -54.450d {-54d 27' 01"} (J2000)
POINT_ROLL:      351.596d
IMG_START_DATE:  16136 TJD;   210 DOY;   12/07/28
IMG_START_TIME:  80859.57 SOD {22:27:39.57} UT,   148.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.778
N_STARS:         190
X_OFFSET:        293 [pixels]
Y_OFFSET:        217 [pixels]
X_MAX:           1732 [pixels]
Y_MAX:           1656 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00529021000msufc0148.fits
SUN_POSTN:       128.61d {+08h 34m 26s}  +18.71d {+18d 42' 53"}
SUN_DIST:         73.59 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
MOON_POSTN:      248.81d {+16h 35m 16s}  -21.26d {-21d 15' 51"}
MOON_DIST:        84.49 [deg]
MOON_ILLUM:      78 [%]
GAL_COORDS:      274.11, -4.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      174.72,-64.67 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 28 Jul 12 22:33:54 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     529021,   Seg_Num: 0
POINT_RA:        137.113d {+09h 08m 27s} (J2000)
POINT_DEC:       -54.450d {-54d 27' 01"} (J2000)
ROLL:            351.596d
IMG_START_DATE:  16136 TJD;   210 DOY;   12/07/28
IMG_START_TIME:  80859.57 SOD {22:27:39.57} UT,   148.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     365207269
X_OFFSET:        852 [pixels]
Y_OFFSET:        776 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1012
Y_GRB_POS:       936
BINNING_INDEX:   1
IM_URL:          sw00529021000msuni0158.fits
SUN_POSTN:       128.61d {+08h 34m 26s}  +18.71d {+18d 42' 52"}
SUN_DIST:         73.59 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
MOON_POSTN:      248.83d {+16h 35m 19s}  -21.26d {-21d 15' 53"}
MOON_DIST:        84.50 [deg]
MOON_ILLUM:      78 [%]
GAL_COORDS:      274.11, -4.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      174.72,-64.67 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 28 Jul 12 22:34:09 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     529021,   Seg_Num: 0
POINT_RA:        137.113d {+09h 08m 27s} (J2000)
POINT_DEC:       -54.450d {-54d 27' 01"} (J2000)
ROLL:            351.596d
IMG_START_DATE:  16136 TJD;   210 DOY;   12/07/28
IMG_START_TIME:  80859.57 SOD {22:27:39.57} UT,   148.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     365207269
X_OFFSET:        852 [pixels]
Y_OFFSET:        776 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1012
Y_GRB_POS:       936
BINNING_INDEX:   1
IM_URL:          sw00529021000msuni0158.fits
SUN_POSTN:       128.61d {+08h 34m 26s}  +18.71d {+18d 42' 52"}
SUN_DIST:         73.59 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
MOON_POSTN:      248.83d {+16h 35m 19s}  -21.27d {-21d 15' 53"}
MOON_DIST:        84.50 [deg]
MOON_ILLUM:      78 [%]
GAL_COORDS:      274.11, -4.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      174.72,-64.67 [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 #13525
J. R. Cummings (NASA/UMBC), S. D. Barthelmy (GSFC), M. M. Chester (PSU), H. A. Krimm (CRESST/GSFC/USRA), N. P. M. Kuin (UCL-MSSL), C. B. Markwardt (NASA/GSFC), A. Maselli (INAF-IASFPA), D. M. Palmer (LANL), M. H. Siegel (PSU) and T. N. Ukwatta (MSU) report on behalf of the Swift Team:
At 22:25:11 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 120728A (trigger=529021). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 137.100, -54.437, which is
```
   RA(J2000)  =  09h 08m 24s
   Dec(J2000) = -54d 26' 13"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a peak with structure with a total duration of about 20 sec. The peak count rate was ~1500 counts/sec (15-350 keV), at ~3 sec after the trigger.
The XRT began observing the field at 22:27:38.8 UT, 147.8 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source located at RA, Dec 137.09412, -54.43783 which is equivalent to:
```
   RA(J2000)  = 09h 08m 22.59s
   Dec(J2000) = -54d 26' 16.2"
```
with an uncertainty of 4.1 arcseconds (radius, 90% containment). This location is 12 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 5.18 x 10^21 cm^-2 (Kalberla et al. 2005).
UVOT took a finding chart exposure of 250 seconds with the U filter starting 148 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. Because of the density of catalogued stars, further analysis is required to report an upper limit for any afterglow in the sub-image. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. Because of the density of catalogued stars, further analysis is required to report an upper limit for any afterglow in the region. No correction has been made for the large, but uncertain extinction expected.
Burst Advocate for this burst is J. R. Cummings (jayc AT milkyway.gsfc.nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 28 Jul 12 22:53:02 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     529021,   Seg_Num: 0
GRB_RA:          137.0948d {+09h 08m 22.75s} (J2000),
                 137.1892d {+09h 08m 45.41s} (current),
                 136.7193d {+09h 06m 52.63s} (1950)
GRB_DEC:         -54.4382d {-54d 26' 17.5"} (J2000),
                 -54.4895d {-54d 29' 22.2"} (current),
                 -54.2349d {-54d 14' 05.6"} (1950)
GRB_ERROR:       3.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  16136 TJD;   210 DOY;   12/07/28
IMG_START_TIME:  80880.00 SOD {22:28:00.00} UT,   169.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       128.62d {+08h 34m 29s}  +18.71d {+18d 42' 40"}
SUN_DIST:         73.57 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
MOON_POSTN:      249.03d {+16h 36m 08s}  -21.28d {-21d 16' 31"}
MOON_DIST:        84.61 [deg]
MOON_ILLUM:      78 [%]
GAL_COORDS:      274.09, -4.57 [deg] galactic lon,lat of the burst
ECL_COORDS:      174.68,-64.67 [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:     Sat 28 Jul 12 22:59:10 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     529021,   Seg_Num: 0
POINT_RA:        137.117d {+09h 08m 28s} (J2000)
POINT_DEC:       -54.450d {-54d 26' 57"} (J2000)
POINT_ROLL:      351.593d
IMG_START_DATE:  16136 TJD;   210 DOY;   12/07/28
IMG_START_TIME:  81593.02 SOD {22:39:53.02} UT,   882.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.100
N_STARS:         190
X_OFFSET:        293 [pixels]
Y_OFFSET:        217 [pixels]
X_MAX:           1732 [pixels]
Y_MAX:           1656 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00529021000msufc0881.fits
SUN_POSTN:       128.63d {+08h 34m 30s}  +18.71d {+18d 42' 37"}
SUN_DIST:         73.58 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
MOON_POSTN:      249.10d {+16h 36m 24s}  -21.28d {-21d 16' 43"}
MOON_DIST:        84.62 [deg]
MOON_ILLUM:      78 [%]
GAL_COORDS:      274.11, -4.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      174.72,-64.67 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 28 Jul 12 22:59:44 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     529021,   Seg_Num: 0
POINT_RA:        137.117d {+09h 08m 28s} (J2000)
POINT_DEC:       -54.450d {-54d 26' 57"} (J2000)
POINT_ROLL:      351.593d
IMG_START_DATE:  16136 TJD;   210 DOY;   12/07/28
IMG_START_TIME:  81593.02 SOD {22:39:53.02} UT,   882.0 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.100
N_STARS:         190
X_OFFSET:        293 [pixels]
Y_OFFSET:        217 [pixels]
X_MAX:           1732 [pixels]
Y_MAX:           1656 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00529021000msufc0881.fits
SUN_POSTN:       128.63d {+08h 34m 30s}  +18.71d {+18d 42' 37"}
SUN_DIST:         73.58 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
MOON_POSTN:      249.10d {+16h 36m 25s}  -21.28d {-21d 16' 44"}
MOON_DIST:        84.62 [deg]
MOON_ILLUM:      78 [%]
GAL_COORDS:      274.11, -4.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      174.72,-64.67 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 28 Jul 12 23:00:10 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     529021,   Seg_Num: 0
POINT_RA:        137.117d {+09h 08m 28s} (J2000)
POINT_DEC:       -54.450d {-54d 26' 57"} (J2000)
ROLL:            351.593d
IMG_START_DATE:  16136 TJD;   210 DOY;   12/07/28
IMG_START_TIME:  81593.02 SOD {22:39:53.02} UT,   882.0 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     365208002
X_OFFSET:        852 [pixels]
Y_OFFSET:        776 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1012
Y_GRB_POS:       936
BINNING_INDEX:   1
IM_URL:          sw00529021000msuni0891.fits
SUN_POSTN:       128.63d {+08h 34m 30s}  +18.71d {+18d 42' 36"}
SUN_DIST:         73.58 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
MOON_POSTN:      249.11d {+16h 36m 26s}  -21.28d {-21d 16' 45"}
MOON_DIST:        84.63 [deg]
MOON_ILLUM:      78 [%]
GAL_COORDS:      274.11, -4.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      174.72,-64.67 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 28 Jul 12 23:00:27 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     529021,   Seg_Num: 0
POINT_RA:        137.117d {+09h 08m 28s} (J2000)
POINT_DEC:       -54.450d {-54d 26' 57"} (J2000)
ROLL:            351.593d
IMG_START_DATE:  16136 TJD;   210 DOY;   12/07/28
IMG_START_TIME:  81593.02 SOD {22:39:53.02} UT,   882.0 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     365208002
X_OFFSET:        852 [pixels]
Y_OFFSET:        776 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1012
Y_GRB_POS:       936
BINNING_INDEX:   1
IM_URL:          sw00529021000msuni0891.fits
SUN_POSTN:       128.63d {+08h 34m 30s}  +18.71d {+18d 42' 36"}
SUN_DIST:         73.58 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
MOON_POSTN:      249.11d {+16h 36m 27s}  -21.28d {-21d 16' 45"}
MOON_DIST:        84.63 [deg]
MOON_ILLUM:      78 [%]
GAL_COORDS:      274.11, -4.57 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      174.72,-64.67 [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 #13526
D. A. Kann, S. Klose (both TLS Tautenburg), and J. Greiner (MPE Garching) report on behalf of the GROND team:
We observed the field of GRB 120728A (Swift trigger 529021; Cummings et al., GCN 13525) 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 23:05 UT on 2012-07-28, 41 minutes after the GRB trigger. Observations were obtained in twilight, at high (2.5) airmass and bad seeing (2".7 in the r' band).
Based on an exposure of 9.4 minutes in the optical and 16 minutes in the NIR we do not detect any source within the Swift/XRT error circle at coordinates RA, Dec(J2000)= 09:08:22.69, -54:26:17.7, error 3".6. (SPER data)
At the edge of the error circle, we find two sources. One, at RA (J2000) = 09:08:23.20, Dec. (J2000) = -54:26:18.8, is a star also visible in the DSS. The other may be marginally detected in the DSS, and likely consists of two sources, centered at (+/- 0".5) RA (J2000) = 09:08:22.82, Dec. (J2000) = -54:26:13.1 and RA (J2000) = 09:08:22.55, Dec. (J2000) = -54:26:14.2. We are unable to make any statements about the variability of these objects at this time, but given the crowded field this close to the Galactic plane, it is likely neither is associated with the GRB.
Preliminary limiting magnitudes (AB mags) are:
```
  g' > 21.6
  r' > 21.9
  i' > 21.3
  z' > 21.1
  J  > 19.5
  H  > 19.9
  Ks > 19.3.
```
Magnitudes are derived based on GROND zeropoints (g'r'i'z') and 2MASS stars (JHKs). No correction for the high Galactic reddening along the line of sight (E(B-V)=0.57 mag; Schlegel et al. 1998) has been applied.
GCN Circular #13528
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 4986 s of XRT Photon Counting mode data and 6 UVOT images for GRB 120728A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 137.09469, -54.43760 which is equivalent to:
```
RA (J2000): 09h 08m 22.73s
Dec (J2000): -54d 26' 15.4"
```
with an uncertainty of 1.7 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #13529
V. D'Elia (ASDC), A. Maselli (INAF-IASFPA), M.C. Stroh (PSU), D.N. Burrows (PSU), J.A. Kennea (PSU), P.A. Evans (U. Leicester), O.M. Littlejohns (U. Leicester), J.P. Osborne (U. Leicester), V. Mangano (INAF-IASFPA) and J.R. Cummings report on behalf of the Swift-XRT team:
We have analysed 10 ks of XRT data for GRB 120728A (Cummings et al. GCN Circ. 13525), from 161 s to 24.9 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN. Circ 13528).
The late-time light curve (from T0+5.1 ks) can be modelled with a power-law decay with a decay index of alpha=0.98 (+/-0.25).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.67 (+0.25, -0.10). The best-fitting absorption column is consistent with the Galactic value of 5.2 x 10^21 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 (1.1 x 10^-10) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     0 (+2.2, -0) x 10^20 cm^-2
Galactic foreground: 5.2 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     2.67 (+0.25, -0.10)
```
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00529021.
This circular is an official product of the Swift-XRT team.
GCN Circular #13533
S. R. Oates (MSSL-UCL) and J. R. Cummings (NASA/UMBC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 120728A 148 s after the BAT trigger (Cummings et al., GCN Circ. 13525). No optical afterglow consistent with the XRT position (Osborne et al., GCN Circ.13528) 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

u_FC               148          398          246         >19.5
v                  456        17454         1356         >20.6
b                  404        24174         2261         >22.3
u                  148        23261         2438         >21.0
w1                 505        19107         1200         >20.8
m2                 480        18359         1357         >21.0
w2                 430        24878         1735         >21.3
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.53 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #13535
C. B. Markwardt (GSFC), 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), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), 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-240 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 120728A (trigger #529021) (Cummings, et al., GCN Circ. 13525). The BAT ground-calculated position is RA, Dec = 137.085, -54.437 deg which is
```
    RA(J2000)  =  09h 08m 20.3s
    Dec(J2000) = -54d 26' 12.4"
```
with an uncertainty of 1.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 13%.
The mask-weighted light curve shows a broad FRED-like peak of total duration ~25 seconds with three subsidiary peaks superimposed. The T90 (15-350 keV) is 22.06 +- 2.59 sec (estimated error including systematics).
The time-averaged spectrum from T+0.56 to T+26.46 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.79 +- 0.13. The fluence in the 15-150 keV band is 2.4 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+12.12 sec in the 15-150 keV band is 2.4 +- 0.5 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/529021/BA/
GCN Circular #13542
D. A. Kann, S. Klose (both TLS Tautenburg), and J. Greiner (MPE Garching) report on behalf of the GROND team:
We observed again the field of GRB 120728A (Swift trigger 529021; Cummings et al., GCN 13525) 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).
Compared to our first epoch (Kann et al., GCN 13526), seeing conditions significantly improved to 1".5 in the r' band. We obtained 7 minutes of optical observations and 12 minutes of NIR observations centered 1.035 days after the GRB. We achieve limiting magnitudes which are 0.5 mag deeper in all optical bands compared to our first epoch, but shallower in the NIR.
The enhanced Swift-XRT position (Osborne et al., GCN 13528) does not include the bright DSS source in the south-east anymore, but still overlaps with the two northern sources (Kann et al., GCN 13526). Upon close inspection, the eastern source is also detected in the DSS, whereas the western source is not. This source is furthermore not present anymore in our second epoch, which we confirm by image subtraction.
We therefore propose this source to be the optical afterglow of GRB 120728A, and derive a position:
```
RA  (J2000) =  09:08:22.62,
DEC (J2000) = -54:26:14.5
```
with an error of 0".8.
The preliminary magnitude is r' = 20.80 +/- 0.16 (statistical) +/- 0.27 (systematic) against the USNO-B1.0 catalog in the first epoch, 0.0377 days after the GRB.
GCN Circular #13595
Shaolin Xiong (UAH) reports on behalf of the Fermi GBM Team:
"At 22:25:13.737 UT on 28 July 2012, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 120728A (trigger 365207115 / 120728934) which was also detected by the Swift/BAT (Cummings et al. 2012, GCN 13525). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 110 degrees.
The GBM light curve consists of multiple pulses with a duration (T90) of about 32.8 s (50-300 keV). The time-averaged spectrum from T0-1.0 s to T0+23.6 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.66 +/- 0.10 and the cutoff energy, parameterized as Epeak, is 119.80 +/- 30.80 keV.
The event fluence (10-1000 keV) in this time interval is (5.29 +/- 0.27)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+13.12 s in the 10-1000 keV band is 3.58 +/- 0.28 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."

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Jochen Greiner, last update: 06-Aug-2012 [Disclaimer]