Gamma-ray Burst 070611

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Jun 07 01:57:51 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     282003,   Seg_Num: 0
GRB_RA:            1.987d {+00h 07m 57s} (J2000),
                   2.081d {+00h 08m 20s} (current),
                   1.351d {+00h 05m 24s} (1950)
GRB_DEC:         -29.755d {-29d 45' 18"} (J2000),
                 -29.714d {-29d 42' 49"} (current),
                 -30.034d {-30d 02' 00"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       16933 [cnts]    Image_Peak=384 [image_cnts]
TRIGGER_DUR:     4.096 [sec] 
TRIGGER_INDEX:   298     E_range: 25-100 keV
BKG_INTEN:       150276 [cnts]
BKG_TIME:        6973.98 SOD {01:56:13.98} UT
BKG_DUR:         40 [sec]
GRB_DATE:        14262 TJD;   162 DOY;   07/06/11
GRB_TIME:        7033.89 SOD {01:57:13.89} UT
GRB_PHI:         -167.27 [deg]
GRB_THETA:        42.98 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.86 [sigma]
IMAGE_SIGNIF:    9.07 [sigma]
MERIT_PARAMS:     +1  +0  +0  +3  +2  +1  +0  +0  +1  +1 
SUN_POSTN:        78.91d {+05h 15m 38s}  +23.05d {+23d 02' 46"}
SUN_DIST:         90.68 [deg]   Sun_angle= 5.1 [hr] (West of Sun)
MOON_POSTN:       21.09d {+01h 24m 21s}  +12.70d {+12d 41' 42"}
MOON_DIST:        46.20 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:       15.02,-80.09 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      348.93,-27.86 [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 = 166.20,-16.33 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Jun 07 02:00:50 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     282003,   Seg_Num: 0
GRB_RA:            1.987d {+00h 07m 57s} (J2000),
                   2.081d {+00h 08m 20s} (current),
                   1.351d {+00h 05m 24s} (1950)
GRB_DEC:         -29.755d {-29d 45' 18"} (J2000),
                 -29.714d {-29d 42' 49"} (current),
                 -30.034d {-30d 02' 00"} (1950)
GRB_DATE:        14262 TJD;   162 DOY;   07/06/11
GRB_TIME:        7033.89 SOD {01:57:13.89} UT
TRIGGER_INDEX:   298
GRB_PHI:         -167.27 [deg]
GRB_THETA:        42.98 [deg]
DELTA_TIME:      -69.00 [sec]
TRIGGER_DUR:     4.096 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.86 [sigma]
IMAGE_SIGNIF:    9.07 [sigma]
LC_URL:          sw00282003000msb.lc
SUN_POSTN:        78.91d {+05h 15m 38s}  +23.05d {+23d 02' 46"}
SUN_DIST:         90.68 [deg]   Sun_angle= 5.1 [hr] (West of Sun)
MOON_POSTN:       21.12d {+01h 24m 28s}  +12.71d {+12d 42' 29"}
MOON_DIST:        46.22 [deg]
MOON_ILLUM:      22 [%]
GAL_COORDS:       15.02,-80.09 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      348.93,-27.86 [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 = 166.20,-16.33 [deg].

GCN Circular #6494
M. C. Stroh (PSU), S. D. Barthelmy (GSFC), J. R. Cummings (NASA/UMBC), N. Gehrels (NASA/GSFC), D. Grupe (PSU), S. T. Holland (CRESST/GSFC/USRA), J. A. Kennea (PSU), W. B. Landsman (NASA/GSFC), C. B. Markwardt (GSFC/UMD), F. E. Marshall (NASA/GSFC), C. Pagani (PSU), D. M. Palmer (LANL), A. M. Parsons (GSFC), M. Stamatikos (NASA/ORAU) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team:
At 01:57:13 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 070611 (trigger=282003). The BAT on-board calculated location is RA, Dec 1.987, -29.755 which is
```
   RA(J2000)  =  00h 07m 57s
   Dec(J2000) = -29d 45' 18"
```
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 10 sec. The peak count rate was ~800 counts/sec (15-350 keV), at ~2 sec after the trigger.
Because of an Earth limb constraint, the spacecraft did not slew promptly to the BAT position, and so there are no immediate XRT or UVOT data products to analyze. XRT and UVOT will begin observing this target at 02:50 UT.
GCN Circular #6495
Bradley E. Schaefer (Louisiana State), S.A. Yost (U Mich), E.S. Rykoff (U Mich), and F. Yuan (U Mich) report on behalf of the ROTSE collaboration:
ROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia, responded to GRB 070611 (Swift trigger 282003; M. C. Stroh et al. 2007, GCN 6494), producing images beginning 7.6 s after the GCN notice time. An automated response took the first image at 01:57:58.6 UT, 44.7 s after the burst, under excellent conditions. We took 10 5-sec, 10 20-sec and 20 60-sec exposures, with further exposures now ongoing. These unfiltered images are calibrated relative to USNO A2.0 (R).
Comparison to the DSS (second epoch) reveals no new sources within the 3-sigma Swift/BAT error circle; the field is not crowded. Individual images have limiting magnitudes ranging from 15.7-17.2; we set the following specific limits.
```
start UT       end UT      t_exp(s)   mlim   t_start-tGRB(s)  Coadd?
--------------------------------------------------------------------
01:57:58.6   01:58:03.6         5     15.8           44.7       N
01:57:58.6   01:59:16.6        78     17.0           44.7       Y
02:04:20.5   02:15:45.2       684     18.3          426.6       Y
```

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Jun 07 02:52:39 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     282003,   Seg_Num: 0
GRB_RA:            1.7813d {+00h 07m 07.5s} (J2000),
                   1.8759d {+00h 07m 30.2s} (current),
                   1.1448d {+00h 04m 34.7s} (1950)
GRB_DEC:         -29.6446d {-29d 38' 40.5"} (J2000),
                 -29.6032d {-29d 36' 11.5"} (current),
                 -29.9229d {-29d 55' 22.4"} (1950)
GRB_ERROR:       4.3 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       43 [cnts]
IMG_START_DATE:  14262 TJD;   162 DOY;   07/06/11
IMG_START_TIME:  10321.06 SOD {02:52:01.06} UT,   3287.2 [sec] since BAT Trigger Time
CENTROID_X:      452.99,  raw= 453  [pixels]
CENTROID_Y:      554.93,  raw= 555  [pixels]
ROLL:            63.71 [deg]
GAIN:            16
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   605.67
GRB_POS_XRT_Z:   355.24
IMAGE_URL:       sw00282003000msxps_rw.img
SUN_POSTN:        78.95d {+05h 15m 47s}  +23.05d {+23d 02' 56"}
SUN_DIST:         90.83 [deg]   Sun_angle= 5.1 [hr] (West of Sun)
MOON_POSTN:       21.60d {+01h 26m 25s}  +12.93d {+12d 55' 55"}
MOON_DIST:        46.60 [deg]
MOON_ILLUM:      21 [%]
GAL_COORDS:       15.86,-79.94 [deg] galactic lon,lat of the burst
ECL_COORDS:      348.80,-27.68 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Jun 07 02:52:39 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     282003,   Seg_Num: 0
GRB_RA:            1.7813d {+00h 07m 07.5s} (J2000),
                   1.8759d {+00h 07m 30.2s} (current),
                   1.1448d {+00h 04m 34.7s} (1950)
GRB_DEC:         -29.6446d {-29d 38' 40.5"} (J2000),
                 -29.6032d {-29d 36' 11.5"} (current),
                 -29.9229d {-29d 55' 22.4"} (1950)
GRB_ERROR:       4.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       5.61e-08 [erg/cm2/sec]
GRB_SIGNIF:      6.55 [sigma]
IMG_START_DATE:  14262 TJD;   162 DOY;   07/06/11
IMG_START_TIME:  10321.06 SOD {02:52:01.06} UT,   3287.2 [sec] since BAT Trigger Time
TAM[0-3]:        327.63 237.18 261.38 243.58
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        78.95d {+05h 15m 47s}  +23.05d {+23d 02' 56"}
SUN_DIST:         90.83 [deg]   Sun_angle= 5.1 [hr] (West of Sun)
MOON_POSTN:       21.60d {+01h 26m 25s}  +12.93d {+12d 55' 55"}
MOON_DIST:        46.60 [deg]
MOON_ILLUM:      21 [%]
GAL_COORDS:       15.86,-79.94 [deg] galactic lon,lat of the burst
ECL_COORDS:      348.80,-27.68 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact; see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Jun 07 02:52:54 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     282003,   Seg_Num: 0
GRB_RA:            1.7813d {+00h 07m 07.5s} (J2000),
                   1.8759d {+00h 07m 30.2s} (current),
                   1.1448d {+00h 04m 34.7s} (1950)
GRB_DEC:         -29.6446d {-29d 38' 40.5"} (J2000),
                 -29.6032d {-29d 36' 11.5"} (current),
                 -29.9229d {-29d 55' 22.4"} (1950)
GRB_ERROR:       4.3 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       43 [cnts]
IMG_START_DATE:  14262 TJD;   162 DOY;   07/06/11
IMG_START_TIME:  10321.06 SOD {02:52:01.06} UT,   3287.2 [sec] since BAT Trigger Time
CENTROID_X:      452.99,  raw= 453  [pixels]
CENTROID_Y:      554.93,  raw= 555  [pixels]
ROLL:            63.71 [deg]
GAIN:            16
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   605.67
GRB_POS_XRT_Z:   355.24
IMAGE_URL:       sw00282003000msxps_rw.img
SUN_POSTN:        78.95d {+05h 15m 47s}  +23.05d {+23d 02' 56"}
SUN_DIST:         90.83 [deg]   Sun_angle= 5.1 [hr] (West of Sun)
MOON_POSTN:       21.61d {+01h 26m 25s}  +12.93d {+12d 55' 59"}
MOON_DIST:        46.60 [deg]
MOON_ILLUM:      21 [%]
GAL_COORDS:       15.86,-79.94 [deg] galactic lon,lat of the burst
ECL_COORDS:      348.80,-27.68 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Jun 07 02:54:17 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     282003,   Seg_Num: 0
POINT_RA:          1.969d {+00h 07m 53s} (J2000)
POINT_DEC:       -29.752d {-29d 45' 08"} (J2000)
POINT_ROLL:      63.709d
IMG_START_DATE:  14262 TJD;   162 DOY;   07/06/11
IMG_START_TIME:  10329.23 SOD {02:52:09.23} UT,   3295.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.525
N_STARS:         22
X_OFFSET:        592 [pixels]
Y_OFFSET:        584 [pixels]
X_MAX:           1551 [pixels]
Y_MAX:           1543 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00282003000msufc3295.fits
SUN_POSTN:        78.95d {+05h 15m 48s}  +23.05d {+23d 02' 56"}
SUN_DIST:         90.73 [deg]   Sun_angle= 5.1 [hr] (West of Sun)
MOON_POSTN:       21.62d {+01h 26m 28s}  +12.94d {+12d 56' 21"}
MOON_DIST:        46.63 [deg]
MOON_ILLUM:      21 [%]
GAL_COORDS:       15.05,-80.08 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.91,-27.85 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Jun 07 02:54:44 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     282003,   Seg_Num: 0
POINT_RA:          1.969d {+00h 07m 53s} (J2000)
POINT_DEC:       -29.752d {-29d 45' 08"} (J2000)
POINT_ROLL:      63.709d
IMG_START_DATE:  14262 TJD;   162 DOY;   07/06/11
IMG_START_TIME:  10329.23 SOD {02:52:09.23} UT,   3295.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.525
N_STARS:         22
X_OFFSET:        592 [pixels]
Y_OFFSET:        584 [pixels]
X_MAX:           1551 [pixels]
Y_MAX:           1543 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00282003000msufc3295.fits
SUN_POSTN:        78.95d {+05h 15m 48s}  +23.05d {+23d 02' 56"}
SUN_DIST:         90.73 [deg]   Sun_angle= 5.1 [hr] (West of Sun)
MOON_POSTN:       21.62d {+01h 26m 29s}  +12.94d {+12d 56' 28"}
MOON_DIST:        46.64 [deg]
MOON_ILLUM:      21 [%]
GAL_COORDS:       15.05,-80.08 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.91,-27.85 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Jun 07 02:55:37 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     282003,   Seg_Num: 0
POINT_RA:          1.969d {+00h 07m 53s} (J2000)
POINT_DEC:       -29.752d {-29d 45' 08"} (J2000)
ROLL:            63.709d
IMG_START_DATE:  14262 TJD;   162 DOY;   07/06/11
IMG_START_TIME:  10329.23 SOD {02:52:09.23} UT,   3295.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     203223131
X_OFFSET:        0 [pixels]
Y_OFFSET:        167 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       0
Y_GRB_POS:       327
BINNING_INDEX:   1
IM_URL:          sw00282003000msuni3295.fits
SUN_POSTN:        78.95d {+05h 15m 48s}  +23.05d {+23d 02' 56"}
SUN_DIST:         90.73 [deg]   Sun_angle= 5.1 [hr] (West of Sun)
MOON_POSTN:       21.63d {+01h 26m 31s}  +12.94d {+12d 56' 41"}
MOON_DIST:        46.64 [deg]
MOON_ILLUM:      21 [%]
GAL_COORDS:       15.05,-80.08 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.91,-27.85 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Jun 07 02:55:51 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     282003,   Seg_Num: 0
POINT_RA:          1.969d {+00h 07m 53s} (J2000)
POINT_DEC:       -29.752d {-29d 45' 08"} (J2000)
ROLL:            63.709d
IMG_START_DATE:  14262 TJD;   162 DOY;   07/06/11
IMG_START_TIME:  10329.23 SOD {02:52:09.23} UT,   3295.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     203223131
X_OFFSET:        0 [pixels]
Y_OFFSET:        167 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       0
Y_GRB_POS:       327
BINNING_INDEX:   1
IM_URL:          sw00282003000msuni3295.fits
SUN_POSTN:        78.95d {+05h 15m 48s}  +23.05d {+23d 02' 56"}
SUN_DIST:         90.73 [deg]   Sun_angle= 5.1 [hr] (West of Sun)
MOON_POSTN:       21.63d {+01h 26m 32s}  +12.95d {+12d 56' 45"}
MOON_DIST:        46.64 [deg]
MOON_ILLUM:      21 [%]
GAL_COORDS:       15.05,-80.08 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      348.91,-27.85 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Jun 07 02:58:58 UT 
NOTICE_TYPE:     Swift-XRT Position RETRACTION
TRIGGER_NUM:     282003,   Seg_Num: 0
GRB_RA:            1.7813d {+00h 07m 07.5s} (J2000),
                   1.8759d {+00h 07m 30.2s} (current),
                   1.1448d {+00h 04m 34.7s} (1950)
GRB_DEC:         -29.6446d {-29d 38' 40.5"} (J2000),
                 -29.6032d {-29d 36' 11.5"} (current),
                 -29.9229d {-29d 55' 22.4"} (1950)
GRB_ERROR:       4.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       5.61e-08 [erg/cm2/sec]
GRB_SIGNIF:      6.50 [sigma]  
IMG_START_DATE:  14262 TJD;   162 DOY;   07/06/11
IMG_START_TIME:  10321.05 SOD {02:52:01.05} UT,   3287.2 [sec] since BAT Trigger Time
TAM[0-3]:        327.61 237.19 261.35 242.66
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        78.95d {+05h 15m 48s}  +23.05d {+23d 02' 57"}
SUN_DIST:         90.83 [deg]   Sun_angle= 5.1 [hr] (West of Sun)
MOON_POSTN:       21.66d {+01h 26m 39s}  +12.96d {+12d 57' 34"}
MOON_DIST:        46.65 [deg]  
MOON_ILLUM:      21 [%]        
GAL_COORDS:       15.86,-79.94 [deg] galactic lon,lat of the burst
ECL_COORDS:      348.80,-27.68 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.
COMMENTS:        The BAT position for this trigger matched a source in the BAT ground catalog.
COMMENTS:        This is a RETRACTION of a previous notice that identified this as a burst afterglow -- it is NOT a GRB. 
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 11 Jun 07 03:23:03 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     282003,   Seg_Num: 0
GRB_RA:            1.9912d {+00h 07m 57.8s} (J2000),
                   2.0857d {+00h 08m 20.5s} (current),
                   1.3554d {+00h 05m 25.2s} (1950)
GRB_DEC:         -29.7567d {-29d 45' 24.1"} (J2000),
                 -29.7153d {-29d 42' 55.0"} (current),
                 -30.0350d {-30d 02' 05.9"} (1950)
GRB_ERROR:       5.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      5.00 [sigma]
IMG_START_DATE:  14262 TJD;   162 DOY;   07/06/11
IMG_START_TIME:  10321.05 SOD {02:52:01.05} UT,   3287.2 [sec] since BAT Trigger Time
TAM[0-3]:        327.61 237.19 261.35 242.66
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:        78.97d {+05h 15m 53s}  +23.05d {+23d 03' 01"}
SUN_DIST:         90.73 [deg]   Sun_angle= 5.1 [hr] (West of Sun)
MOON_POSTN:       21.89d {+01h 27m 33s}  +13.06d {+13d 03' 47"}
MOON_DIST:        46.85 [deg]
MOON_ILLUM:      21 [%]
GAL_COORDS:       15.00,-80.09 [deg] galactic lon,lat of the burst
ECL_COORDS:      348.93,-27.86 [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.   
COMMENTS:        This is a corrected XRT position.

GCN Circular #6496
GRB 070611; Swift-XRT position
M.C. Stroh, J. A. Kennea & C. Pagani (PSU) report on behalf of the Swift-XRT team:
We have analyzed the first 1.8 ks of prompt downlinked data for GRB 070611 (trigger=282003, GCN Circ. 6494). Because of an Earth limb constraint, the spacecraft did not slew promptly to the BAT position and the XRT observations started 3.3 ks since the BAT Trigger.
In the BAT error circle we find an uncatalogued source at position RA, Dec 1.9912, -29.7568 which is
```
   RA(J2000)  = 00 07 57.9
   Dec(J2000) = -29 45 24.3
```
with an uncertainty of 5.1 arcsec (radius, 90% containment).
The XRT position is 15arcsec from the BAT on board position (GCN Circ. 6494), within the BAT error circle. We are waiting for additional downlinked data to assess the fading behavior of the proposed X-ray afterglow.
This circular is an official product of the Swift-XRT team.
GCN Circular #6497
E. S. Rykoff, F. Yuan, S. A. Yost (U. Mich), report on behalf of the ROTSE collaboration:
ROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia, responded to GRB 070611 (Swift trigger 282003; Stroh et al., GCN 6494), producing images beginning 7.6 s after the GCN notice time, as reported in GCN 6495 (Schaefer, et al.). These unfiltered images are calibrated relative to USNO-B1.0 (R).
Further analysis reveals a faint, late-rising counterpart at a position consistent with the XRT position reported in GCN 6496 (Stroh, et al.). At a midpoint of 2157 s after the burst (in a 600 s stacked image), the counterpart was at a peak magnitude of 18.4+/-0.1 at a position:
00:07:58.0 -29:45:19.4 (J2000) [uncertainty < 1"]
The counterpart then faded below 19th magnitude by 6000 s post-burst.
A jpeg image is available at http://www.rotse.net/images/gsb282003_3c041-050_key.jpg Note that the object marked 156 is the candidate in question.
GCN Circular #6499
Christina C. Thoene (DARK), Pall Jakobsson (Univ. of Hertfordshire), Johan P. U. Fynbo, Daniele Malesani, Jens Hjorth (DARK) and Paul M. Vreeswijk (ESO) report:
We observed the OT (Rykoff et al., GCN 6497) of GRB 070611 (Stroh et al., GCN 6494) with FORS2/VLT using grism 300V through thin clouds. 2x30 min spectra were acquired starting on June 11, UT 09:37.
In the spectra, we detect Lyman alpha, SiII, OI, CII, CIV and AlII from which we infer a redshift of z=2.04 for that burst. In addition, we detect Mg II and Fe II from an intervening system at z=1.29.
We thank the Paranal staff for excellent support, in particular Arjan Bik and Mario van den Ancker.
GCN Circular #6502
L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), M.C. Stroh (PSU), J. Tueller (GSFC), T. Ukwatta (GWU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 070611 (trigger #282003) (Stroh et al., GCN Circ. 6494). The BAT ground-calculated position is RA, Dec = 2.003, -29.758 deg which is
```
    RA(J2000) = 0h 8m 0.8s
    Dec(J2000) = -29d 45' 28"
```
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 50%.
The BAT light curve shows a single, symmetric peak. T90 (15-350 keV) is 12.0 +- 1 sec (estimated error including systematics). There is a possible second episode of emission ( at ~4.5 sigma) starting at T+70 and lasting for ~15 sec.
The time-averaged spectrum from T-6.3 to T+7.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.66 +- 0.22. The fluence in the 15-150 keV band is 3.9 +- 0.6 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+2.76 sec in the 15-150 keV band is 0.8 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
GCN Circular #6503
M.C. Stroh, C. Pagani & J. Racusin report on behalf of the Swift XRT team:
We have analysed the first four orbits of XRT data of GRB 070611 (Stroh et al., GCN Circ. 6494) with total exposure time of 8.9 ks in Photon Counting mode. The calculated XRT position is RA(J2000) = 1.9927, Dec (J2000) = -29.7557, corresponding to:
```
RA(J2000)  = 00h 07m 58.3s
Dec(J2000) = -29d 45' 20.4"
```
with an uncertainty of 4.0 arcsec (radius, 90% containment). This is 6.1 arcsec from the initial XRT position, and 3.4 arcsec from the ROTSE-III optical candidate reported by Rykoff, et al. (GCN Circ. 6497).
The XRT light curve follows a power-law decay with index 0.83 +/- 0.27 continuing through T+30 ks.
The PC spectrum can be fit with an absorbed power law with photon index of 1.9 +/- 0.5 and column density of (5 +/- 5) E20 cm-2, consistent with the Galactic absorption column density (1.34E20 cm-2; Dickey & Lockman, 1990).
The absorbed (unabsorbed) 0.3-10.0 keV average flux in the T+3 ks - T+30 ks time interval is 6.056E-13 (6.825E-13) ergs cm-2 s-1.
Assuming that the source continues its decay at the present rate, we predict an XRT count rate of 4.9E-3 counts/s at T+24 h, which corresponds to an absorbed (unabsorbed) flux of 2.144E-14 (2.417E-14) ergs cm-2 s-1.
This circular is an official product of the Swift XRT team.
GCN Circular #6504
W. Landsman (NASA/GSFC), F.E. Marshall (NASA/GSFC) and M.C. Stroh (PSU) report on behalf of the Swift/UVOT team.
UVOT took a finding chart exposure of 98 seconds of the field of GRB 070611 (Stroh et al., GCN 6494) with the White (160-650 nm) filter starting 3295 seconds after the BAT trigger. The UVOT finding chart was delayed due to an Earth limb constraint.
We detect the afterglow candidate reported by Rykoff et al. (GCN 6497), and measure a position of
```
 RA(J2000) = 00 07 58.01       
 Dec(J2000) = -29 45 20.0      
```
with an estimated 90% uncertainty of 0.5".
Because of a configuration problem, most subsequent UVOT images do not include the afterglow position, but there is a 3.5 sigma detection in a subsequent image taken with the UVW1 (2600 A) filter. Magnitudes and 3 sigma upper limits are reported below.
```
Filter        T_start(sec)     Exposure(sec)         Mag
  
White           3295                 98            19.12 ? 0.11
UVW1            4632                197            19.51 ? 0.31
UVW1           10046                886           >20.72  (3 sigma)
UVM2            4427                197           >19.64  (3 sigma) 
UVW2            4019                197           >19.97  (3 sigma)
```
The lack of detections in the UVM2 (2260 A) and UVW2 (1930 A) filters are consistent with the redshift of z=2.04 reported by Thoene et al. (GCN 6499).
No correction has been made for the expected reddening of E(B-V) = 0.012
GCN Report 63.1
GCN_Report 63.1 has been posted: http://gcn.gsfc.nasa.gov/reports/report_63_1.pdf by M.C. Stroh at PSU titled: "Swift observations of GRB 070611"
GCN Report 63.2
GCN_Report 63.2 has been posted: http://gcn.gsfc.nasa.gov/reports/report_63_2.pdf by M.C. Stroh at PSU titled: "Swift observations of GRB 070611"
GCN Circular #6528
Gary Melady, John French, (University College Dublin), Petr Kubanek, Martin Jelinek (IAA CSIC Granada, Spain)
on behalf of the Watcher collaboration report:
The Watcher 40cm robotic telescope, located at Boyden Observatory, South Africa, began imaging the field of GRB 070611 (Stroh et al., GCN 6494) at 01:58:33 UT, 1m 17s after the Swift trigger (40s after receipt of the GCN notice).
We combined our initial series of 10s exposures to create a 440s unfiltered image with an exposure mid-time of 2:05:21 (501s after the burst). This shows no new source in the XRT error box (Stroh et al., GCN 6496) down to an R-band limiting magnitude of approx. 19.2 (in comparison to USNO-B1). Later images show a faint, uncatalogued source within the XRT error box coincident with the ROTSE detection (Rykoff et al., GCN 6497).
These observations are summarised below:
```
mean time UT      t-t0(s) 	exp(s) 	      Rmag
-------------------------------------------------------- 
 02:18:56          1316		 900	  19.08 +/- 0.24
 02:32:48	   2148		 210	  18.53 +/- 0.24
 02:37:11	   2411		 180	  19.12 +/- 0.30
 02:42:46	   2746		 240	  18.99 +/- 0.26
 02:48:54	   3144		 330	  19.19 +/- 0.24
```
The source is not detected in subsequent observations down to an R-band limiting magnitude of approx 19.2.
The field was no longer observed after 02:54 due to the system's incorrect handling of the retracted XRT position.
This message may be cited.
GCN Report 63.3
GCN_Report 63.3 has been posted: http://gcn.gsfc.nasa.gov/reports/report_63_3.pdf by M.C. Stroh at PSU titled: "Final Swift observations of GRB 070611"
GCN Circular #6601
Pall Jakobsson (U. Hertfordshire), Daniele Malesani, Dong Xu, Johan P.U. Fynbo, Jens Hjorth and Christina C. Thoene (DARK, NBI) report:
Using FORS1 on the Very Large Telescope during non-photometric conditions, we obtained a total of 4200 s R-band imaging of the GRB 070611 field (Stroh et al., GCN 6494) on June 15.375 (4.26 days after the burst). On the edge of the refined XRT circle (Butler 2007, AJ, 133, 1027; DSS catalog; version 3.6), we clearly detect a source that is consistent with the UVOT position (Landsman et al., GCN 6504).
Compared to the acquisition image obtained on June 11.040 (7.58 hr post-burst; Thoene et al., GCN 6499), the source has faded by dm = 5.3 +/- 0.3 mag. If the optical afterglow displays a similar fading behaviour as the X-ray afterglow with a possible jet-break around 1 day (Stroh et al., GCN Report 63.3), we would expect dm = 3.5 +/- 1.4 mag. Thus, the VLT observations are marginally consistent with a break occurring in the optical band as well.
We note that the source is somewhat extended at the latter epoch, implying that the host might contribute to the flux and hence the observed dm could be larger. An image of the field (on June 15.375) is shown at:
http://star-www.herts.ac.uk/~palli/grb070611/grb070611.jpg

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Jochen Greiner, last update: 06-Jul-2007 [Disclaimer]