Gamma-ray Burst 070628

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 28 Jun 07 14:41:31 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     283320,   Seg_Num: 0
GRB_RA:          115.284d {+07h 41m 08s} (J2000),
                 115.366d {+07h 41m 28s} (current),
                 114.736d {+07h 38m 57s} (1950)
GRB_DEC:         -20.285d {-20d 17' 04"} (J2000),
                 -20.302d {-20d 18' 08"} (current),
                 -20.167d {-20d 10' 00"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       10869 [cnts]    Image_Peak=466 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   149     E_range: 25-100 keV
BKG_INTEN:       60784 [cnts]
BKG_TIME:        52845.94 SOD {14:40:45.94} UT
BKG_DUR:         8 [sec]
GRB_DATE:        14279 TJD;   179 DOY;   07/06/28
GRB_TIME:        52862.84 SOD {14:41:02.84} UT
GRB_PHI:         -20.30 [deg]
GRB_THETA:        38.20 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     24.37 [sigma]
IMAGE_SIGNIF:    12.08 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +8  +0  +1 -68  +1 
SUN_POSTN:        97.12d {+06h 28m 28s}  +23.28d {+23d 16' 36"}
SUN_DIST:         47.07 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:      251.48d {+16h 45m 56s}  -27.41d {-27d 24' 46"}
MOON_DIST:       116.12 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      236.55,  1.23 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      122.04,-40.95 [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 = 272.25,-16.86 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 28 Jun 07 14:44:01 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     283320,   Seg_Num: 0
POINT_RA:        115.277d {+07h 41m 07s} (J2000)
POINT_DEC:       -20.279d {-20d 16' 45"} (J2000)
IMG_START_DATE:  14279 TJD;   179 DOY;   07/06/28
IMG_START_TIME:  52973.67 SOD {14:42:53.67} UT,   110.8 [sec] since BAT Trigger Time
COUNTS:          109    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        4    Max_iter_allowed= 4
ERROR_CODE:      2
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        Algorithm did not converge; too many interations.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 28 Jun 07 14:46:06 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     283320,   Seg_Num: 0
GRB_RA:          115.284d {+07h 41m 08s} (J2000),
                 115.366d {+07h 41m 28s} (current),
                 114.736d {+07h 38m 57s} (1950)
GRB_DEC:         -20.285d {-20d 17' 04"} (J2000),
                 -20.302d {-20d 18' 08"} (current),
                 -20.167d {-20d 10' 00"} (1950)
GRB_DATE:        14279 TJD;   179 DOY;   07/06/28
GRB_TIME:        52862.84 SOD {14:41:02.84} UT
TRIGGER_INDEX:   149
GRB_PHI:         -20.30 [deg]
GRB_THETA:        38.20 [deg]
DELTA_TIME:      7395.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     24.37 [sigma]
IMAGE_SIGNIF:    12.08 [sigma]
LC_URL:          sw00283320000msb.lc
SUN_POSTN:        97.12d {+06h 28m 29s}  +23.28d {+23d 16' 35"}
SUN_DIST:         47.07 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:      251.53d {+16h 46m 07s}  -27.42d {-27d 25' 04"}
MOON_DIST:       116.15 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      236.55,  1.23 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      122.04,-40.95 [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 = 272.25,-16.86 [deg].  
COMMENTS:        The 3rd packet (of 3) was missing in the lightcurve data stream.

GCN Circular #6584
S. T. Holland (CRESST/GSFC/USRA), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), P. J. Brown (PSU), D. N. Burrows (PSU), S. Campana (INAF-OAB), M. L. Conciatore (ASDC), N. Gehrels (NASA/GSFC), C. Gronwall (PSU), C. Guidorzi (Univ Bicocca&INAF-OAB), J. A. Kennea (PSU), H. A. Krimm (GSFC/USRA), V. La Parola (INAF-IASFPA), V. Mangano (INAF-IASFPA), F. E. Marshall (NASA/GSFC), P. T. O'Brien (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL), M. Perri (ASDC), P. Romano (Univ. Bicocca & INAF-OAB), T. Sakamoto (NASA/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (NASA/ORAU) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team:
At 14:41:02 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 070628 (trigger=283320). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 115.284, -20.285 which is
```
   RA(J2000)  =  07h 41m 08s
   Dec(J2000) = -20d 17' 04"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single peak on a rising background while entering the SAA with a duration of about 20 sec. The peak count rate was ~3000 counts/sec (15-350 keV), at ~5 sec after the trigger. Given the galactic latitude of +1.25deg, we can not rule out a Galactic transient origin of this trigger.
The XRT began taking data at 14:42:53 UT, 111 seconds after the BAT trigger. The initial image mode frames show many cosmic ray tracks due to entrance into the SAA; the XRT on-board centroid algorithm did not find a source in the image and no prompt position is available. Further XRT data are delayed by the SAA passage. We are waiting for down-linked data to detect and determine a position for the source.
Because Swift was entering the SAA, there were no prompt UVOT observations of this source.
Burst Advocate for this burst is S. T. Holland (sholland 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:     Thu 28 Jun 07 15:02:11 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     283320,   Seg_Num: 0
POINT_RA:        115.276d {+07h 41m 06s} (J2000)
POINT_DEC:       -20.280d {-20d 16' 47"} (J2000)
POINT_ROLL:      336.989d
IMG_START_DATE:  14279 TJD;   179 DOY;   07/06/28
IMG_START_TIME:  53961.78 SOD {14:59:21.78} UT,   1098.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.195
N_STARS:         190
X_OFFSET:        448 [pixels]
Y_OFFSET:        614 [pixels]
X_MAX:           1407 [pixels]
Y_MAX:           1573 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00283320000msufc1098.fits
SUN_POSTN:        97.13d {+06h 28m 32s}  +23.28d {+23d 16' 33"}
SUN_DIST:         47.06 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:      251.68d {+16h 46m 44s}  -27.43d {-27d 26' 04"}
MOON_DIST:       116.25 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      236.54,  1.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      122.02,-40.95 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 28 Jun 07 15:02:49 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     283320,   Seg_Num: 0
POINT_RA:        115.276d {+07h 41m 06s} (J2000)
POINT_DEC:       -20.280d {-20d 16' 47"} (J2000)
POINT_ROLL:      336.989d
IMG_START_DATE:  14279 TJD;   179 DOY;   07/06/28
IMG_START_TIME:  53961.78 SOD {14:59:21.78} UT,   1098.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.195
N_STARS:         190
X_OFFSET:        448 [pixels]
Y_OFFSET:        614 [pixels]
X_MAX:           1407 [pixels]
Y_MAX:           1573 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00283320000msufc1098.fits
SUN_POSTN:        97.13d {+06h 28m 32s}  +23.28d {+23d 16' 33"}
SUN_DIST:         47.06 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:      251.69d {+16h 46m 45s}  -27.44d {-27d 26' 07"}
MOON_DIST:       116.25 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      236.54,  1.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      122.02,-40.95 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 28 Jun 07 15:03:41 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     283320,   Seg_Num: 0
POINT_RA:        115.276d {+07h 41m 06s} (J2000)
POINT_DEC:       -20.280d {-20d 16' 47"} (J2000)
ROLL:            336.989d
IMG_START_DATE:  14279 TJD;   179 DOY;   07/06/28
IMG_START_TIME:  53961.78 SOD {14:59:21.78} UT,   1098.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     204735563
X_OFFSET:        767 [pixels]
Y_OFFSET:        933 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       927
Y_GRB_POS:       1093
BINNING_INDEX:   1
IM_URL:          sw00283320000msuni1098.fits
SUN_POSTN:        97.13d {+06h 28m 32s}  +23.28d {+23d 16' 33"}
SUN_DIST:         47.06 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:      251.70d {+16h 46m 47s}  -27.44d {-27d 26' 10"}
MOON_DIST:       116.25 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      236.54,  1.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      122.02,-40.95 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 28 Jun 07 15:04:06 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     283320,   Seg_Num: 0
POINT_RA:        115.276d {+07h 41m 06s} (J2000)
POINT_DEC:       -20.280d {-20d 16' 47"} (J2000)
ROLL:            336.989d
IMG_START_DATE:  14279 TJD;   179 DOY;   07/06/28
IMG_START_TIME:  53961.78 SOD {14:59:21.78} UT,   1098.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     204735563
X_OFFSET:        767 [pixels]
Y_OFFSET:        933 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       927
Y_GRB_POS:       1093
BINNING_INDEX:   1
IM_URL:          sw00283320000msuni1098.fits
SUN_POSTN:        97.13d {+06h 28m 32s}  +23.28d {+23d 16' 33"}
SUN_DIST:         47.06 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:      251.70d {+16h 46m 48s}  -27.44d {-27d 26' 11"}
MOON_DIST:       116.26 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      236.54,  1.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      122.02,-40.95 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 28 Jun 07 15:04:31 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     283320,   Seg_Num: 0
POINT_RA:        115.276d {+07h 41m 06s} (J2000)
POINT_DEC:       -20.280d {-20d 16' 47"} (J2000)
POINT_ROLL:      336.989d
IMG_START_DATE:  14279 TJD;   179 DOY;   07/06/28
IMG_START_TIME:  54065.18 SOD {15:01:05.18} UT,   1202.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.188
N_STARS:         190
X_OFFSET:        448 [pixels]
Y_OFFSET:        614 [pixels]
X_MAX:           1407 [pixels]
Y_MAX:           1573 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00283320000msufc1202.fits
SUN_POSTN:        97.13d {+06h 28m 32s}  +23.28d {+23d 16' 33"}
SUN_DIST:         47.06 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:      251.71d {+16h 46m 49s}  -27.44d {-27d 26' 13"}
MOON_DIST:       116.26 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      236.54,  1.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      122.02,-40.95 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 28 Jun 07 15:05:02 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     283320,   Seg_Num: 0
POINT_RA:        115.276d {+07h 41m 06s} (J2000)
POINT_DEC:       -20.280d {-20d 16' 47"} (J2000)
POINT_ROLL:      336.989d
IMG_START_DATE:  14279 TJD;   179 DOY;   07/06/28
IMG_START_TIME:  54065.18 SOD {15:01:05.18} UT,   1202.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.188
N_STARS:         190
X_OFFSET:        448 [pixels]
Y_OFFSET:        614 [pixels]
X_MAX:           1407 [pixels]
Y_MAX:           1573 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00283320000msufc1202.fits
SUN_POSTN:        97.13d {+06h 28m 32s}  +23.28d {+23d 16' 33"}
SUN_DIST:         47.06 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:      251.71d {+16h 46m 50s}  -27.44d {-27d 26' 15"}
MOON_DIST:       116.26 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      236.54,  1.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      122.02,-40.95 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 28 Jun 07 15:05:55 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     283320,   Seg_Num: 0
POINT_RA:        115.276d {+07h 41m 06s} (J2000)
POINT_DEC:       -20.280d {-20d 16' 47"} (J2000)
ROLL:            336.989d
IMG_START_DATE:  14279 TJD;   179 DOY;   07/06/28
IMG_START_TIME:  54065.18 SOD {15:01:05.18} UT,   1202.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     204735667
X_OFFSET:        767 [pixels]
Y_OFFSET:        933 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       927
Y_GRB_POS:       1093
BINNING_INDEX:   1
IM_URL:          sw00283320000msuni1202.fits
SUN_POSTN:        97.13d {+06h 28m 32s}  +23.28d {+23d 16' 33"}
SUN_DIST:         47.06 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:      251.72d {+16h 46m 53s}  -27.44d {-27d 26' 18"}
MOON_DIST:       116.27 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      236.54,  1.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      122.02,-40.95 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 28 Jun 07 15:06:20 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     283320,   Seg_Num: 0
POINT_RA:        115.276d {+07h 41m 06s} (J2000)
POINT_DEC:       -20.280d {-20d 16' 47"} (J2000)
ROLL:            336.989d
IMG_START_DATE:  14279 TJD;   179 DOY;   07/06/28
IMG_START_TIME:  54065.18 SOD {15:01:05.18} UT,   1202.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     204735667
X_OFFSET:        767 [pixels]
Y_OFFSET:        933 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       927
Y_GRB_POS:       1093
BINNING_INDEX:   1
IM_URL:          sw00283320000msuni1202.fits
SUN_POSTN:        97.13d {+06h 28m 32s}  +23.28d {+23d 16' 33"}
SUN_DIST:         47.06 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:      251.72d {+16h 46m 53s}  -27.44d {-27d 26' 20"}
MOON_DIST:       116.27 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      236.54,  1.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      122.02,-40.95 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 28 Jun 07 15:10:06 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     283320,   Seg_Num: 0
POINT_RA:        115.276d {+07h 41m 06s} (J2000)
POINT_DEC:       -20.280d {-20d 16' 47"} (J2000)
POINT_ROLL:      336.989d
IMG_START_DATE:  14279 TJD;   179 DOY;   07/06/28
IMG_START_TIME:  54170.83 SOD {15:02:50.83} UT,   1308.0 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        3.694
N_STARS:         190
X_OFFSET:        448 [pixels]
Y_OFFSET:        614 [pixels]
X_MAX:           1407 [pixels]
Y_MAX:           1573 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00283320000msufc1307.fits
SUN_POSTN:        97.14d {+06h 28m 33s}  +23.28d {+23d 16' 32"}
SUN_DIST:         47.06 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:      251.76d {+16h 47m 02s}  -27.44d {-27d 26' 34"}
MOON_DIST:       116.29 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      236.54,  1.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      122.02,-40.95 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 28 Jun 07 15:10:34 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     283320,   Seg_Num: 0
POINT_RA:        115.276d {+07h 41m 06s} (J2000)
POINT_DEC:       -20.280d {-20d 16' 47"} (J2000)
POINT_ROLL:      336.989d
IMG_START_DATE:  14279 TJD;   179 DOY;   07/06/28
IMG_START_TIME:  54170.83 SOD {15:02:50.83} UT,   1308.0 [sec] since BAT Trigger Time
FILTER:          3, V
BKG_MEAN:        3.694
N_STARS:         190
X_OFFSET:        448 [pixels]
Y_OFFSET:        614 [pixels]
X_MAX:           1407 [pixels]
Y_MAX:           1573 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00283320000msufc1307.fits
SUN_POSTN:        97.14d {+06h 28m 33s}  +23.28d {+23d 16' 32"}
SUN_DIST:         47.06 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:      251.76d {+16h 47m 03s}  -27.44d {-27d 26' 36"}
MOON_DIST:       116.29 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      236.54,  1.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      122.02,-40.95 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 28 Jun 07 15:11:38 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     283320,   Seg_Num: 0
POINT_RA:        115.276d {+07h 41m 06s} (J2000)
POINT_DEC:       -20.280d {-20d 16' 47"} (J2000)
ROLL:            336.989d
IMG_START_DATE:  14279 TJD;   179 DOY;   07/06/28
IMG_START_TIME:  54170.83 SOD {15:02:50.83} UT,   1308.0 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     204735772
X_OFFSET:        767 [pixels]
Y_OFFSET:        933 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       927
Y_GRB_POS:       1093
BINNING_INDEX:   1
IM_URL:          sw00283320000msuni1307.fits
SUN_POSTN:        97.14d {+06h 28m 33s}  +23.28d {+23d 16' 32"}
SUN_DIST:         47.05 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:      251.77d {+16h 47m 06s}  -27.44d {-27d 26' 40"}
MOON_DIST:       116.30 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      236.54,  1.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      122.02,-40.95 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 28 Jun 07 15:12:03 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     283320,   Seg_Num: 0
POINT_RA:        115.276d {+07h 41m 06s} (J2000)
POINT_DEC:       -20.280d {-20d 16' 47"} (J2000)
ROLL:            336.989d
IMG_START_DATE:  14279 TJD;   179 DOY;   07/06/28
IMG_START_TIME:  54170.83 SOD {15:02:50.83} UT,   1308.0 [sec] since BAT Trigger Time
FILTER:          3, V
EXPOSURE_ID:     204735772
X_OFFSET:        767 [pixels]
Y_OFFSET:        933 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       927
Y_GRB_POS:       1093
BINNING_INDEX:   1
IM_URL:          sw00283320000msuni1307.fits
SUN_POSTN:        97.14d {+06h 28m 33s}  +23.28d {+23d 16' 32"}
SUN_DIST:         47.05 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:      251.78d {+16h 47m 07s}  -27.45d {-27d 26' 41"}
MOON_DIST:       116.30 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      236.54,  1.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      122.02,-40.95 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 28 Jun 07 15:14:15 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     283320,   Seg_Num: 0
GRB_RA:          115.2760d {+07h 41m 06.2s} (J2000),
                 115.3580d {+07h 41m 25.9s} (current),
                 114.7284d {+07h 38m 54.8s} (1950)
GRB_DEC:         -20.2795d {-20d 16' 46.1"} (J2000),
                 -20.2973d {-20d 17' 50.3"} (current),
                 -20.1618d {-20d 09' 42.5"} (1950)
GRB_ERROR:       4.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      5.00 [sigma]
IMG_START_DATE:  14279 TJD;   179 DOY;   07/06/28
IMG_START_TIME:  52973.66 SOD {14:42:53.66} UT,   110.8 [sec] since BAT Trigger Time
TAM[0-3]:        327.61 237.19 261.35 242.66
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        97.14d {+06h 28m 34s}  +23.28d {+23d 16' 32"}
SUN_DIST:         47.05 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
MOON_POSTN:      251.80d {+16h 47m 12s}  -27.45d {-27d 26' 49"}
MOON_DIST:       116.31 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      236.54,  1.23 [deg] galactic lon,lat of the burst
ECL_COORDS:      122.02,-40.95 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        TAM values are not valid.

GCN Circular #6585
Swift UVOT Observations of GRB 070628
C. Gronwall (PSU) and S. T. Holland (CRESST/GSFC/USRA) report on the behalf of the Swift UVOT team:
In response to GRB 070628 (Swift/BAT trigger 283320) at 14:41:02.84 UT, UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 1099 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
    RA(J2000)  = 07:41:06.12 = 115.2755
    DEC(J2000) = -20:16:46.2  = -20.2795
```
with a 1-sigma error radius of about 0.6 arc sec. This position is 34.9 arcsec. from the center of the BAT error circle. The estimated magnitude is 19.1 with a 1-sigma error of about 0.5 mag. No correction has been made for extinction.
GCN Circular #6586
Gary Melady (University College Dublin), John French (UCD), Petr Kubanek (GACE Valencia), Martin Jelinek (IAA CSIC Granada)
report on behalf of the Watcher collaboration:
The Watcher 40cm robotic telescope, located at Boyden Observatory, South Africa, responded to Swift Trigger 283320 (GRB 070628, Holland et al. GCN 6584). when the dome opened at 15:17:29 UT, 36.43 minutes after the trigger. However the bright evening sky rendered the earliest images unusable.
An unfiltered 60s exposure taken under twilight conditions at 16:12:48 UT, 91.76 minutes after the Swift trigger, showed no new source in the UVOT error box (as reported by Gronwall et al., GCN 6585) down to an R-band limiting magnitude of approx 16.2 (in comparison to USNO-B1).
We combined 27 subsequent 60s exposures to create a 1620s unfiltered image with an exposure mid-time of 16:28:05 (108.05 minutes after the trigger). The later images were taken at high air mass as the target was setting. This shows no new source in the error box down to an R-band limiting magnitude of approx 17.2.
The target set at our location at 18:20 UT so no further observations will be made.
This message may be cited.
GCN Circular #6587
M. Perri, G. Stratta (ASDC) and S.T. Holland (CRESST/GSFC/USRA) report on behalf of the Swift XRT team:
We have analysed the first 3 orbits of Swift XRT data from the possible burst GRB 070628 (Holland et al., GCN Circ. 6584). Using an exposure time of 6.3 ks the refined XRT position is RA (J2000) = 115.275833, Dec (J2000) = -20.279750, corresponding to:
```
RA(J2000) = 07h 41m 06.2s
Dec(J2000) = -20d 16' 47.1"
```
with an uncertainty of 3.5" (90% containment). This is 0.5 arcmin from the BAT position (GCN Circ. 6584) and 1.4 arcsec from the UVOT position (Gronwall et al. GCN Circ. 6585).
The XRT light-curve in the time interval from T+116s to T+14ks shows a fading behavior with superimposed flaring activity. More data are being collected to monitor the light-curve evolution.
The X-ray spectrum covering the time period from T+1.1ks to T+14ks is well fit by an absorbed power law with a photon index of 2.2 +/- 0.1 and a total column density of NH=(7.5+/-0.7)e21 cm**-2. We note that the Galactic column density in the direction of the source is 7.35e21 cm**-2 (Dickey & Lockman 1990).
This circular is an official product of the Swift XRT team.
GCN Circular #6588
Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report:
We imaged the field of GRB 070628 detected by SWIFT (trigger 283320) with the TAROT robotic telescope (D=25cm) located at the European Southern Observatory, La Silla observatory, Chile.
The observations started 8.3h after the GRB trigger (started at the begining of the night). The elevation of the field decreased from from 22 degrees above horizon and weather conditions were good.
We co-added a series of exposures filtered in R, V and I. We do not detect any OT at the UVOT location (Gronwall & Holland GCN Circ. 6585):
t0+8.3h to t0+9.1h : R > 17.9
Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.
N.B. Galactic coordinates are lon=236.5513 lat= +1.2335 and the galactic extinction in R band is 2.4 magnitudes estimated from D. Schlegel et al. 1998ApJ...500..525S.
This message may be cited.
GCN Circular #6589
H. Krimm (GSFC/USRA), L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), S. T. Holland (CRESST/GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+67 sec from recent telemetry downlinks, we report further analysis of BAT GRB 070628 (trigger #283320) (Holland, et al., GCN Circ. 6584). The BAT ground-calculated position is RA, Dec = 115.271, -20.281 deg which is
```
   RA(J2000)  =   7h 41m 5.1s 
   Dec(J2000) = -20d 16' 50"
```
with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 58%.
The mask-weighted light curve shows pretrigger emission starting at T-30 sec. Then comes the main emission peak (roughly symmetrical) starting at ~T-5 sec and ending at ~T+20 sec. T90 (15-350 keV) is 39.1 +- 2 sec (estimated error including systematics). The BAT data end at T+67 sec because Swift entered the SAA.
The time-averaged spectrum from T-31.7 to T+16.2 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.91 +- 0.09. The fluence in the 15-150 keV band is 3.5 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+4.90 sec in the 15-150 keV band is 5.1 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
GCN Circular #6590
N. Primak, G. Szokoly, J. Greiner, C. Clemens, T. Kruehler, A. Kuepcue-Yoldas, A. Yoldas (all MPE Garching), S. Klose, A. Rossi (Tautenburg Observatory), and F. Carrier (Instituut voor Sterrenkunde Leuven, Belgium) report:
We observed the field of GRB 070628 (Swift trigger 283320; Holland et al., GCN 6584) with GROND at the 2.2m Max-Planck Institute telescope at the ESO La Silla observatory in Chile. The observations started at 22:21:57, about 7.7 hrs after the GRB and just after sunset, and lasted 10 min. We observed simultaneously in the g,r,i,z,J,H,K bands. The UVOT afterglow (Cronwall & Holland, GCN 6585) is clearly detected at H=16.2+-0.3 and K=16.3+-0.2 mag. The NIR magnitudes are calibrated against 2MASS. Nothing is visible in the J band (limiting magnitude 16.0), and all optical frames are saturated due to twilight.
We note that the afterglow was atypically bright for the given time after the burst, suggesting a slow fading. We encourage near-IR spectroscopy to determine the redshift.

GCN Circular #6591
The Swift/UVOT observed the field of GRB 070628 starting 1099 sec after=20 the trigger (Holland et al., GCN Circ. 6584). We strongly detect the=20 afterglow in the white and V filters, and have a weak detection in the B=20 filter. The refined afterglow position is

RA(J2000)  =  07h 41m 06.09s
Dec(J2000) = -20d 16' 45.4"

with an uncertainty of 0.7" (radius, 90% containment, including systematic uncertainty). This is within the refined XRT error circle (Perri et al. GCN Circ. 6587).
Magnitudes and upper limits are reported below.

Filter   Tstart  Tstop    Exp       Mag
          (s)     (s)     (s)

WHITE    1099    1199      98     19.65 =B1 0.11
         1202    1302      98     19.62 =B1 0.11
         6628    6827     197     20.59 =B1 0.15
        11691   11990     295    >21.2 (3 sigma)

V        1309    1708     393     18.88  =B1 0.11
         1850    5804     256     19.55  =B1 0.25
        13207   13506     295    >19.6 (3 sigma)

B        1786    6622      78     20.7 =B1 0.3
         7856    8055     197    >20.4 (3 sigma)

U        6217    6417     197    >20.0 (3 sigma)

UVW1     6014    6213     197    >19.8 (3 sigma)

UVM2     5809    6008     197    >19.6 (3 sigma)

UVW2     6833    7032     197    >19.9 (3 sigma)

The above magnitudes are not corrected for the large and uncertain extinction expected at the low Galactic latitude of GRB 070628.
A power-law fit to the white filter observations gives a decay index of ~0.55 +/- 0.3.

GCN Report 68.1
GCN_Report 68.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_68_1.pdf by S.T. Holland at CRESST/USRA/GSFC titled: "Swift observations of GRB 070628"

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Jochen Greiner, last update: 30-Jun-2007 [Disclaimer]