Gamma-ray Burst 090728

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 Jul 09 14:46:30 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     358574,   Seg_Num: 0
GRB_RA:           29.660d {+01h 58m 38s} (J2000),
                  29.806d {+01h 59m 14s} (current),
                  28.899d {+01h 55m 36s} (1950)
GRB_DEC:         +41.647d {+41d 38' 49"} (J2000),
                 +41.693d {+41d 41' 36"} (current),
                 +41.404d {+41d 24' 15"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       15322 [cnts]    Image_Peak=373 [image_cnts]
TRIGGER_DUR:     4.096 [sec] 
TRIGGER_INDEX:   301     E_range: 25-100 keV
BKG_INTEN:       133846 [cnts]
BKG_TIME:        53091.05 SOD {14:44:51.05} UT
BKG_DUR:         40 [sec]
GRB_DATE:        15040 TJD;   209 DOY;   09/07/28
GRB_TIME:        53145.96 SOD {14:45:45.96} UT
GRB_PHI:         -15.22 [deg]
GRB_THETA:        46.31 [deg]
SOLN_STATUS:     0x2003
RATE_SIGNIF:     10.95 [sigma]
IMAGE_SIGNIF:    9.64 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +2  +0  +0  +0 -10  +0 
SUN_POSTN:       128.02d {+08h 32m 05s}  +18.86d {+18d 51' 22"}
SUN_DIST:         83.45 [deg]   Sun_angle= 6.5 [hr] (West of Sun)
MOON_POSTN:      208.17d {+13h 52m 41s}  -17.25d {-17d 15' 04"}
MOON_DIST:       155.52 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      136.18,-19.49 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       42.91, 27.56 [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:        There is a bright star (mag=6.78) 8.35 arcmin from this position.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 235.69,16.48 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 Jul 09 14:48:09 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     358574,   Seg_Num: 0
GRB_RA:           29.6512d {+01h 58m 36.28s} (J2000),
                  29.7973d {+01h 59m 11.36s} (current),
                  28.8902d {+01h 55m 33.64s} (1950)
GRB_DEC:         +41.6329d {+41d 37' 58.4"} (J2000),
                 +41.6792d {+41d 40' 45.0"} (current),
                 +41.3900d {+41d 23' 24.1"} (1950)
GRB_ERROR:       6.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       3.90e-10 [erg/cm2/sec]
GRB_SIGNIF:      4.47 [sigma]
IMG_START_DATE:  15040 TJD;   209 DOY;   09/07/28
IMG_START_TIME:  53256.54 SOD {14:47:36.54} UT,   110.6 [sec] since BAT Trigger Time
TAM[0-3]:        327.65 237.23 261.43 243.53
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       128.02d {+08h 32m 05s}  +18.86d {+18d 51' 21"}
SUN_DIST:         83.47 [deg]   Sun_angle= 6.5 [hr] (West of Sun)
MOON_POSTN:      208.18d {+13h 52m 44s}  -17.26d {-17d 15' 22"}
MOON_DIST:       155.54 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      136.17,-19.51 [deg] galactic lon,lat of the burst
ECL_COORDS:       42.90, 27.55 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.94 arcmin from the BAT position.  
COMMENTS:        There is a bright star (mag=6.78) 8.31 arcmin from the XRT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 Jul 09 14:48:19 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     358574,   Seg_Num: 0
GRB_RA:           29.6512d {+01h 58m 36.2s} (J2000),
                  29.7973d {+01h 59m 11.3s} (current),
                  28.8902d {+01h 55m 33.6s} (1950)
GRB_DEC:         +41.6329d {+41d 37' 58.4"} (J2000),
                 +41.6792d {+41d 40' 45.0"} (current),
                 +41.3900d {+41d 23' 24.1"} (1950)
GRB_ERROR:       6.5 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       20 [cnts]
IMG_START_DATE:  15040 TJD;   209 DOY;   09/07/28
IMG_START_TIME:  53256.54 SOD {14:47:36.54} UT,   110.6 [sec] since BAT Trigger Time
CENTROID_X:      328.42,  raw= 328  [pixels]
CENTROID_Y:      300.20,  raw= 300  [pixels]
ROLL:            70.45 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   5.19
GRB_POS_XRT_Z:   61.58
IMAGE_URL:       sw00358574000msxps_rw.img
SUN_POSTN:       128.02d {+08h 32m 05s}  +18.86d {+18d 51' 21"}
SUN_DIST:         83.47 [deg]   Sun_angle= 6.5 [hr] (West of Sun)
MOON_POSTN:      208.18d {+13h 52m 44s}  -17.26d {-17d 15' 24"}
MOON_DIST:       155.54 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      136.17,-19.51 [deg] galactic lon,lat of the burst
ECL_COORDS:       42.90, 27.55 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.  
COMMENTS:        There is a bright star (mag=6.78) 8.35 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 Jul 09 14:48:26 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     358574,   Seg_Num: 0
GRB_RA:           29.6512d {+01h 58m 36.2s} (J2000),
                  29.7973d {+01h 59m 11.3s} (current),
                  28.8902d {+01h 55m 33.6s} (1950)
GRB_DEC:         +41.6329d {+41d 37' 58.4"} (J2000),
                 +41.6792d {+41d 40' 45.0"} (current),
                 +41.3900d {+41d 23' 24.1"} (1950)
GRB_ERROR:       6.5 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       20 [cnts]
IMG_START_DATE:  15040 TJD;   209 DOY;   09/07/28
IMG_START_TIME:  53256.54 SOD {14:47:36.54} UT,   110.6 [sec] since BAT Trigger Time
CENTROID_X:      328.42,  raw= 328  [pixels]
CENTROID_Y:      300.20,  raw= 300  [pixels]
ROLL:            70.45 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   5.19
GRB_POS_XRT_Z:   61.58
IMAGE_URL:       sw00358574000msxps_rw.img
SUN_POSTN:       128.02d {+08h 32m 05s}  +18.86d {+18d 51' 21"}
SUN_DIST:         83.47 [deg]   Sun_angle= 6.5 [hr] (West of Sun)
MOON_POSTN:      208.19d {+13h 52m 45s}  -17.26d {-17d 15' 25"}
MOON_DIST:       155.54 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      136.17,-19.51 [deg] galactic lon,lat of the burst
ECL_COORDS:       42.90, 27.55 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.  
COMMENTS:        There is a bright star (mag=6.78) 8.35 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 Jul 09 14:49:31 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     358574,   Seg_Num: 0
GRB_RA:           29.660d {+01h 58m 38s} (J2000),
                  29.806d {+01h 59m 14s} (current),
                  28.899d {+01h 55m 36s} (1950)
GRB_DEC:         +41.647d {+41d 38' 49"} (J2000),
                 +41.693d {+41d 41' 36"} (current),
                 +41.404d {+41d 24' 15"} (1950)
GRB_DATE:        15040 TJD;   209 DOY;   09/07/28
GRB_TIME:        53145.96 SOD {14:45:45.96} UT
TRIGGER_INDEX:   301
GRB_PHI:         -15.22 [deg]
GRB_THETA:        46.31 [deg]
DELTA_TIME:      -50.00 [sec]
TRIGGER_DUR:     4.096 [sec] 
SOLN_STATUS:     0x2003
RATE_SIGNIF:     10.95 [sigma]
IMAGE_SIGNIF:    9.64 [sigma]
LC_URL:          sw00358574000msb.lc
SUN_POSTN:       128.02d {+08h 32m 06s}  +18.86d {+18d 51' 20"}
SUN_DIST:         83.46 [deg]   Sun_angle= 6.5 [hr] (West of Sun)
MOON_POSTN:      208.20d {+13h 52m 47s}  -17.26d {-17d 15' 38"}
MOON_DIST:       155.53 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      136.18,-19.49 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       42.91, 27.56 [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:        There is a bright star (mag=6.78) 8.35 arcmin from this position.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 235.69,16.48 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 Jul 09 14:52:21 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     358574,   Seg_Num: 0
POINT_RA:         29.674d {+01h 58m 42s} (J2000)
POINT_DEC:       +41.636d {+41d 38' 09"} (J2000)
POINT_ROLL:      70.451d
IMG_START_DATE:  15040 TJD;   209 DOY;   09/07/28
IMG_START_TIME:  53262.43 SOD {14:47:42.43} UT,   116.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.118
N_STARS:         109
X_OFFSET:        160 [pixels]
Y_OFFSET:        272 [pixels]
X_MAX:           1599 [pixels]
Y_MAX:           1711 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00358574000msufc0116.fits
SUN_POSTN:       128.03d {+08h 32m 06s}  +18.86d {+18d 51' 19"}
SUN_DIST:         83.45 [deg]   Sun_angle= 6.6 [hr] (West of Sun)
MOON_POSTN:      208.22d {+13h 52m 53s}  -17.27d {-17d 16' 10"}
MOON_DIST:       155.55 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      136.19,-19.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.92, 27.54 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.  
COMMENTS:        There is a bright star (mag=6.78) 8.35 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 Jul 09 14:52:21 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     358574,   Seg_Num: 0
POINT_RA:         29.674d {+01h 58m 42s} (J2000)
POINT_DEC:       +41.636d {+41d 38' 09"} (J2000)
POINT_ROLL:      70.451d
IMG_START_DATE:  15040 TJD;   209 DOY;   09/07/28
IMG_START_TIME:  53262.43 SOD {14:47:42.43} UT,   116.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.118
N_STARS:         109
X_OFFSET:        160 [pixels]
Y_OFFSET:        272 [pixels]
X_MAX:           1599 [pixels]
Y_MAX:           1711 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00358574000msufc0116.fits
SUN_POSTN:       128.03d {+08h 32m 06s}  +18.86d {+18d 51' 19"}
SUN_DIST:         83.45 [deg]   Sun_angle= 6.6 [hr] (West of Sun)
MOON_POSTN:      208.22d {+13h 52m 53s}  -17.27d {-17d 16' 10"}
MOON_DIST:       155.55 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      136.19,-19.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.92, 27.54 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.  
COMMENTS:        There is a bright star (mag=6.78) 8.35 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 Jul 09 14:53:00 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     358574,   Seg_Num: 0
POINT_RA:         29.674d {+01h 58m 42s} (J2000)
POINT_DEC:       +41.636d {+41d 38' 09"} (J2000)
POINT_ROLL:      70.451d
IMG_START_DATE:  15040 TJD;   209 DOY;   09/07/28
IMG_START_TIME:  53262.43 SOD {14:47:42.43} UT,   116.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.118
N_STARS:         109
X_OFFSET:        160 [pixels]
Y_OFFSET:        272 [pixels]
X_MAX:           1599 [pixels]
Y_MAX:           1711 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00358574000msufc0116.fits
SUN_POSTN:       128.03d {+08h 32m 06s}  +18.86d {+18d 51' 18"}
SUN_DIST:         83.45 [deg]   Sun_angle= 6.6 [hr] (West of Sun)
MOON_POSTN:      208.23d {+13h 52m 54s}  -17.27d {-17d 16' 17"}
MOON_DIST:       155.55 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      136.19,-19.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.92, 27.54 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.  
COMMENTS:        There is a bright star (mag=6.78) 8.35 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 Jul 09 14:54:05 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     358574,   Seg_Num: 0
POINT_RA:         29.674d {+01h 58m 42s} (J2000)
POINT_DEC:       +41.636d {+41d 38' 09"} (J2000)
ROLL:            70.451d
IMG_START_DATE:  15040 TJD;   209 DOY;   09/07/28
IMG_START_TIME:  53262.43 SOD {14:47:42.43} UT,   116.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     270485267
X_OFFSET:        696 [pixels]
Y_OFFSET:        939 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       856
Y_GRB_POS:       1099
BINNING_INDEX:   1
IM_URL:          sw00358574000msuni0121.fits
SUN_POSTN:       128.03d {+08h 32m 06s}  +18.85d {+18d 51' 18"}
SUN_DIST:         83.45 [deg]   Sun_angle= 6.6 [hr] (West of Sun)
MOON_POSTN:      208.24d {+13h 52m 57s}  -17.28d {-17d 16' 29"}
MOON_DIST:       155.56 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      136.19,-19.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.92, 27.54 [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:        There is a bright star (mag=6.78) 8.35 arcmin from the BAT position.

GCN Circular #9725
V. Mangano (INAF-IASFPA), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), D. N. Burrows (PSU), P.A. Curran (MSSL-UCL), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), S. T. Holland (CRESST/USRA/GSFC), E. A. Hoversten (PSU), J. A. Kennea (PSU), N. P. M. Kuin (MSSL), F. E. Marshall (NASA/GSFC), P. T. O'Brien (U Leicester), P. Romano (INAF-IASFPA), T. Sakamoto (NASA/UMBC), B. Sbarufatti (INAF-IASFPA), M. H. Siegel (PSU), M. Stamatikos (NASA/ORAU) and M. A. Stark (PSU) report on behalf of the Swift Team:
At 14:45:45 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 090728 (trigger=358574). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 29.660, +41.647 which is
```
   RA(J2000) = 01h 58m 38s
   Dec(J2000) = +41d 38' 49"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single peak with a duration of about 20 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~2 sec after the trigger.
The XRT began observing the field at 14:47:36.5 UT, 110.6 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 29.65234, 41.63270 which is equivalent to:
```
   RA(J2000)  = 01h 58m 36.56s
   Dec(J2000) = +41d 37' 57.7"
```
with an uncertainty of 4.2 arcseconds (radius, 90% containment). This location is 55 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 7.35e+20 cm^-2 (Kalberla et al. 2005).
The initial flux in the 2.5 s image was 3.90e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 250 seconds with the U filter starting 116 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 3-sigma upper limit is 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 0.07. The XRT position is near a bright (< 6.5 mag) star.
Burst Advocate for this burst is V. Mangano (vanessa AT ifc.inaf.it). 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:     Tue 28 Jul 09 14:54:31 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     358574,   Seg_Num: 0
POINT_RA:         29.674d {+01h 58m 42s} (J2000)
POINT_DEC:       +41.636d {+41d 38' 09"} (J2000)
ROLL:            70.451d
IMG_START_DATE:  15040 TJD;   209 DOY;   09/07/28
IMG_START_TIME:  53262.43 SOD {14:47:42.43} UT,   116.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     270485267
X_OFFSET:        696 [pixels]
Y_OFFSET:        939 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       856
Y_GRB_POS:       1099
BINNING_INDEX:   1
IM_URL:          sw00358574000msuni0121.fits
SUN_POSTN:       128.03d {+08h 32m 06s}  +18.85d {+18d 51' 17"}
SUN_DIST:         83.45 [deg]   Sun_angle= 6.6 [hr] (West of Sun)
MOON_POSTN:      208.24d {+13h 52m 57s}  -17.28d {-17d 16' 34"}
MOON_DIST:       155.56 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      136.19,-19.50 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.92, 27.54 [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.  
COMMENTS:        There is a bright star (mag=6.78) 8.35 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 Jul 09 15:03:52 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     358574,   Seg_Num: 0
POINT_RA:         29.671d {+01h 58m 41s} (J2000)
POINT_DEC:       +41.639d {+41d 38' 22"} (J2000)
POINT_ROLL:      70.448d
IMG_START_DATE:  15040 TJD;   209 DOY;   09/07/28
IMG_START_TIME:  54020.03 SOD {15:00:20.03} UT,   874.1 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.968
N_STARS:         67
X_OFFSET:        136 [pixels]
Y_OFFSET:        379 [pixels]
X_MAX:           1575 [pixels]
Y_MAX:           1818 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00358574000msufc0874.fits
SUN_POSTN:       128.03d {+08h 32m 08s}  +18.85d {+18d 51' 12"}
SUN_DIST:         83.46 [deg]   Sun_angle= 6.6 [hr] (West of Sun)
MOON_POSTN:      208.32d {+13h 53m 17s}  -17.31d {-17d 18' 20"}
MOON_DIST:       155.59 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      136.19,-19.49 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.91, 27.55 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.  
COMMENTS:        There is a bright star (mag=6.78) 8.35 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 Jul 09 15:04:24 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     358574,   Seg_Num: 0
POINT_RA:         29.671d {+01h 58m 41s} (J2000)
POINT_DEC:       +41.639d {+41d 38' 22"} (J2000)
POINT_ROLL:      70.448d
IMG_START_DATE:  15040 TJD;   209 DOY;   09/07/28
IMG_START_TIME:  54020.03 SOD {15:00:20.03} UT,   874.1 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.968
N_STARS:         67
X_OFFSET:        136 [pixels]
Y_OFFSET:        379 [pixels]
X_MAX:           1575 [pixels]
Y_MAX:           1818 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00358574000msufc0874.fits
SUN_POSTN:       128.03d {+08h 32m 08s}  +18.85d {+18d 51' 11"}
SUN_DIST:         83.46 [deg]   Sun_angle= 6.6 [hr] (West of Sun)
MOON_POSTN:      208.33d {+13h 53m 18s}  -17.31d {-17d 18' 26"}
MOON_DIST:       155.59 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      136.19,-19.49 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.91, 27.55 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.  
COMMENTS:        There is a bright star (mag=6.78) 8.35 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 Jul 09 15:03:52 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     358574,   Seg_Num: 0
POINT_RA:         29.671d {+01h 58m 41s} (J2000)
POINT_DEC:       +41.639d {+41d 38' 22"} (J2000)
POINT_ROLL:      70.448d
IMG_START_DATE:  15040 TJD;   209 DOY;   09/07/28
IMG_START_TIME:  54020.03 SOD {15:00:20.03} UT,   874.1 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.968
N_STARS:         67
X_OFFSET:        136 [pixels]
Y_OFFSET:        379 [pixels]
X_MAX:           1575 [pixels]
Y_MAX:           1818 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00358574000msufc0874.fits
SUN_POSTN:       128.03d {+08h 32m 08s}  +18.85d {+18d 51' 12"}
SUN_DIST:         83.46 [deg]   Sun_angle= 6.6 [hr] (West of Sun)
MOON_POSTN:      208.32d {+13h 53m 17s}  -17.31d {-17d 18' 20"}
MOON_DIST:       155.59 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      136.19,-19.49 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.91, 27.55 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.  
COMMENTS:        There is a bright star (mag=6.78) 8.35 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 Jul 09 15:05:33 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     358574,   Seg_Num: 0
POINT_RA:         29.671d {+01h 58m 41s} (J2000)
POINT_DEC:       +41.639d {+41d 38' 22"} (J2000)
ROLL:            70.448d
IMG_START_DATE:  15040 TJD;   209 DOY;   09/07/28
IMG_START_TIME:  54020.03 SOD {15:00:20.03} UT,   874.1 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     270486024
X_OFFSET:        695 [pixels]
Y_OFFSET:        938 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       855
Y_GRB_POS:       1098
BINNING_INDEX:   1
IM_URL:          sw00358574000msuni0879.fits
SUN_POSTN:       128.03d {+08h 32m 08s}  +18.85d {+18d 51' 11"}
SUN_DIST:         83.46 [deg]   Sun_angle= 6.6 [hr] (West of Sun)
MOON_POSTN:      208.34d {+13h 53m 21s}  -17.31d {-17d 18' 39"}
MOON_DIST:       155.59 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      136.19,-19.49 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.91, 27.55 [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.  
COMMENTS:        There is a bright star (mag=6.78) 8.35 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 Jul 09 15:05:39 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     358574,   Seg_Num: 0
GRB_RA:           29.6530d {+01h 58m 36.71s} (J2000),
                  29.7991d {+01h 59m 11.79s} (current),
                  28.8920d {+01h 55m 34.07s} (1950)
GRB_DEC:         +41.6334d {+41d 38' 00.2"} (J2000),
                 +41.6797d {+41d 40' 46.8"} (current),
                 +41.3905d {+41d 23' 25.9"} (1950)
GRB_ERROR:       2.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  15040 TJD;   209 DOY;   09/07/28
IMG_START_TIME:  53322.00 SOD {14:48:42.00} UT,   176.0 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       128.03d {+08h 32m 08s}  +18.85d {+18d 51' 11"}
SUN_DIST:         83.48 [deg]   Sun_angle= 6.5 [hr] (West of Sun)
MOON_POSTN:      208.34d {+13h 53m 21s}  -17.31d {-17d 18' 40"}
MOON_DIST:       155.60 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      136.18,-19.50 [deg] galactic lon,lat of the burst
ECL_COORDS:       42.90, 27.55 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        There is a bright star (mag=6.78) 8.37 arcmin from the XRT position.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry

GCN Circular #9726
A. Melandri, C.G. Mundell, Z. Cano, R.J. Smith, I.A. Steele, S. Kobayashi, C.J. Mottram, D.F. Bersier (Liverpool JMU),A. Gomboc (Ljubljana), C. Guidorzi (INAF-OAB) report:
"The 2-m Faulkes Telescope North robotically followed up GRB090728 (SWIFT trigger 358574; Mangano et al. GCN 9725) beginning about 9.6 min after the GRB trigger time.
We identify a rapidly fading optical counterpart at:
```
RA (J2000)=01:58:36.6
Dec(J2000)=+41:37:59.6
```
This source is not detected in our R-band images, but is detected in SDSS-I band images with i'=19.55+/-0.3 mag (at a mean time of 13.2 min after the burst) wrt USNO-B1 I-mag.
Spectroscopic followup is encouraged."

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 Jul 09 15:05:16 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     358574,   Seg_Num: 0
POINT_RA:         29.671d {+01h 58m 41s} (J2000)
POINT_DEC:       +41.639d {+41d 38' 22"} (J2000)
ROLL:            70.448d
IMG_START_DATE:  15040 TJD;   209 DOY;   09/07/28
IMG_START_TIME:  54020.03 SOD {15:00:20.03} UT,   874.1 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     270486024
X_OFFSET:        695 [pixels]
Y_OFFSET:        938 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       855
Y_GRB_POS:       1098
BINNING_INDEX:   1
IM_URL:          sw00358574000msuni0879.fits
SUN_POSTN:       128.03d {+08h 32m 08s}  +18.85d {+18d 51' 11"}
SUN_DIST:         83.46 [deg]   Sun_angle= 6.6 [hr] (West of Sun)
MOON_POSTN:      208.33d {+13h 53m 20s}  -17.31d {-17d 18' 36"}
MOON_DIST:       155.59 [deg]
MOON_ILLUM:      47 [%]
GAL_COORDS:      136.19,-19.49 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       42.91, 27.55 [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).  
COMMENTS:        There is a bright star (mag=6.78) 8.35 arcmin from the BAT position.

GCN Circular #9727
Sub:GRB 090728, RIMOTS optical upper limits
K.Noda, H.Hayasi, E.Sonoda, N.Ohmori, K.Kono A.Daikyuji, Y.Nisioka, M.Yamauchi (University of Miyazaki)
We have observed the field covering the error circle of GRB 090728 (Swift trigger 358574, GCN 9725, V. Mangano et al.) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. The observation was started 14:46:53 UT, about 23 sec after the Swift trigger time. We have compared our data of 30 sec exposures with the USNO-A2.0 catalog, There is no new source at the reported position. (Swift trigger 358574, GCN 9725, V. Mangano et al.)
```
the upper limits are as follows:
--------------------------------------------------------------
Start(UT)   End(UT)    Num. of frames    Limit (mag.)
--------------------------------------------------------------
14:59:59	15:00:29          1            13.8
14:46:53	15:00:29         11            15.4
---------------------------------------------------------------
```
GCN Circular #9729
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 2365 s of XRT Photon Counting mode data and 4 UVOT images for GRB 090728, 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 = 29.65290, +41.63313 which is equivalent to:
```
RA (J2000): 01h 58m 36.70s
Dec (J2000): +41d 37' 59.3"
```
with an uncertainty of 1.8 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, arXiv:0812.3662).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #9730
GRB 090728: Swift/UVOT Upper Limits
P.A. Curran (MSSL-UCL), V. Mangano (INAF-IASFPA), report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 090728 117s after the BAT trigger (Mangano et al., GCN 9725). No optical afterglow consistent with the refined XRT position (Osborne et al., GCN 9729) or the optical counterpart (Melandri et al. , GCN 9726) is detected in the UVOT exposures. This is consistent with the R-band non-detection of Melandri et al.
Preliminary 3-sigma upper limits using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for the initial finding chart (FC) and subsequent exposures are:
```
Filter   T_start(s)    T_stop(s)    Exp(s)    Mag

v       422             6883           479        > 20.70
b       372             6643           491        > 21.45
u       117             366            150        > 20.00 (FC)
u       117             6437           842        > 21.34
uw1     472             6233           452        > 21.05
um2     447             6026           452        > 20.75
uw2     398             6849           490        > 20.89
```
The values quoted above are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.07 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #9734
V. Mangano, B. Sbarufatti (INAF IASF Pa) report on beahalf the Swift XRT Team:
We have analysed 9.8 ks of XRT data for GRB 090728 (Mangano et al. GCN Circ. 9725), from 116.9 s to 53.1 ks after the BAT trigger. The data comprise 55.3 s in Windowed Timing (WT) mode from T+116.9 s to T+172.2 s, with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN. Circ 9729).
The 0.3-10 keV XRT light curve is well modeled by a doubly broken power law with initial decay slope -5.5 =B1 0.5, first break at T+204 =B1 10 s, plateau phase slope -0.11 =B1 0.14, second break at T+1.8 =B1 1.2 ks and final slope -1.7 =B1 0.1. Decaying at the present rate the source will reach a level of 2e-4 counts/s on July 30 at 14:45 UT (48 h after the trigger).
We extracted the average WT spectrum of the early decay phase (55.3 s exposure), and the average PC spectra of the plateau phase (866 s exposure, from T+174 s to T+1071 s) and the final decay phase (7.4 ks exposure, from T+4383 s to T+18.4 ks). The three spectra are well fitted by an absorbed power law model with NH consistent with the Galactic value of 7.35e20 cm-2 (Kalberla et al. 2005) and photon indices of 2.4 =B1 0.4, 1.8 =B1 0.2, and 2.0 =B1 0.3, respectively. The average 0.3-10 keV observed [unabsorbed] fluxes are 1.6e-10 [2.9e-10] erg cm-2 s-1, 2.7e-11 [3.0e-11] erg cm-2 s-1, and 1.5e-12 [2.3e-12] erg cm-2 s-1, respectively.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00358574.
This circular is an official product of the Swift-XRT team.
GCN Circular #9736
D. M. Palmer (LANL), 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), V. Mangano (INAF-IASFPA), C. B. Markwardt (GSFC/UMD), A. M. Parsons (GSFC), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from recent telemetry downlinks, we report further analysis of BAT GRB 090728 (trigger #358574) (Mangano, et al., GCN Circ. 9725). The BAT ground-calculated position is RA, Dec = 29.644, 41.632 deg which is
```
   RA(J2000)  =  01h 58m 34.5s 
   Dec(J2000) = +41d 37' 53.7" 
```
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 37%.
The mask-weighted light curve shows a single pulse starting at ~T-10 sec, peaking at ~T+2 sec, and ending at ~T+70 sec. T90 (15-350 keV) is 59 +- 18 sec (estimated error including systematics).
The time-averaged spectrum from T-5.0 to T+63.2 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.05 +- 0.26. The fluence in the 15-150 keV band is 1.0 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+1.25 sec in the 15-150 keV band is 1.0 +- 0.3 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/358574/BA/

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Jochen Greiner, last update: 29-Jul-2009 [Disclaimer]