Gamma-ray Burst 060717

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 17 Jul 06 09:08:04 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     219646,   Seg_Num: 0
GRB_RA:          170.862d {+11h 23m 27s} (J2000),
                 170.948d {+11h 23m 48s} (current),
                 170.195d {+11h 20m 47s} (1950)
GRB_DEC:         +28.948d {+28d 56' 54"} (J2000),
                 +28.912d {+28d 54' 44"} (current),
                 +29.223d {+29d 13' 22"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       9340 [cnts]    Image_Peak=249 [image_cnts]
TRIGGER_DUR:     2.048 [sec] 
TRIGGER_INDEX:   443     E_range: 15-50 keV
BKG_INTEN:       98951 [cnts]
BKG_TIME:        32822.67 SOD {09:07:02.67} UT
BKG_DUR:         24 [sec]
GRB_DATE:        13933 TJD;   198 DOY;   06/07/17
GRB_TIME:        32858.90 SOD {09:07:38.90} UT
GRB_PHI:         -130.60 [deg]
GRB_THETA:        12.98 [deg]
SOLN_STATUS:     0x83
RATE_SIGNIF:     9.69 [sigma]
IMAGE_SIGNIF:    6.68 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +1  +0  +0  +0 -65  +1 
SUN_POSTN:       116.59d {+07h 46m 21s}  +21.19d {+21d 11' 26"}
SUN_DIST:         49.44 [deg]   Sun_angle= -3.6 [hr] (East of Sun)
MOON_POSTN:       16.98d {+01h 07m 55s}   +9.16d {+09d 09' 53"}
MOON_DIST:       134.39 [deg]
MOON_ILLUM:      55 [%]
GAL_COORDS:      202.42, 70.53 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      159.67, 22.88 [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:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 150.71,-20.37 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 17 Jul 06 09:11:10 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     219646,   Seg_Num: 0
GRB_RA:          170.862d {+11h 23m 27s} (J2000),
                 170.948d {+11h 23m 48s} (current),
                 170.195d {+11h 20m 47s} (1950)
GRB_DEC:         +28.948d {+28d 56' 54"} (J2000),
                 +28.912d {+28d 54' 44"} (current),
                 +29.223d {+29d 13' 22"} (1950)
GRB_DATE:        13933 TJD;   198 DOY;   06/07/17
GRB_TIME:        32858.90 SOD {09:07:38.90} UT
TRIGGER_INDEX:   443
GRB_PHI:         -130.60 [deg]
GRB_THETA:        12.98 [deg]
DELTA_TIME:      57.00 [sec]
TRIGGER_DUR:     2.048 [sec] 
SOLN_STATUS:     0x83
RATE_SIGNIF:     9.69 [sigma]
IMAGE_SIGNIF:    6.68 [sigma]
LC_URL:          sw00219646000msb.lc
SUN_POSTN:       116.59d {+07h 46m 21s}  +21.19d {+21d 11' 25"}
SUN_DIST:         49.43 [deg]   Sun_angle= -3.6 [hr] (East of Sun)
MOON_POSTN:       17.01d {+01h 08m 01s}   +9.18d {+09d 10' 43"}
MOON_DIST:       134.36 [deg]
MOON_ILLUM:      55 [%]
GAL_COORDS:      202.42, 70.53 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      159.67, 22.88 [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:        Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.  
COMMENTS:        This trigger occurred at longitude,latitude = 150.71,-20.37 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 17 Jul 06 09:12:11 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     219646,   Seg_Num: 0
POINT_RA:        170.887d {+11h 23m 33s} (J2000)
POINT_DEC:       +28.953d {+28d 57' 11"} (J2000)
IMG_START_DATE:  13933 TJD;   198 DOY;   06/07/17
IMG_START_TIME:  33075.39 SOD {09:11:15.39} UT,   216.5 [sec] since BAT Trigger Time
COUNTS:          2    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        1    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 17 Jul 06 09:14:17 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     219646,   Seg_Num: 0
POINT_RA:        170.887d {+11h 23m 33s} (J2000)
POINT_DEC:       +28.953d {+28d 57' 11"} (J2000)
POINT_ROLL:      274.015d
IMG_START_DATE:  13933 TJD;   198 DOY;   06/07/17
IMG_START_TIME:  33080.17 SOD {09:11:20.17} UT,   221.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.088
N_STARS:         8
X_OFFSET:        607 [pixels]
Y_OFFSET:        437 [pixels]
X_MAX:           1566 [pixels]
Y_MAX:           1396 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00219646000msufc0221.fits
SUN_POSTN:       116.59d {+07h 46m 22s}  +21.19d {+21d 11' 24"}
SUN_DIST:         49.45 [deg]   Sun_angle= -3.6 [hr] (East of Sun)
MOON_POSTN:       17.03d {+01h 08m 08s}   +9.19d {+09d 11' 33"}
MOON_DIST:       134.35 [deg]
MOON_ILLUM:      55 [%]
GAL_COORDS:      202.41, 70.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      159.69, 22.89 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 17 Jul 06 09:14:57 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     219646,   Seg_Num: 0
POINT_RA:        170.887d {+11h 23m 33s} (J2000)
POINT_DEC:       +28.953d {+28d 57' 11"} (J2000)
ROLL:            274.015d
IMG_START_DATE:  13933 TJD;   198 DOY;   06/07/17
IMG_START_TIME:  33080.17 SOD {09:11:20.17} UT,   221.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     174820281
X_OFFSET:        927 [pixels]
Y_OFFSET:        757 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1087
Y_GRB_POS:       917
BINNING_INDEX:   1
IM_URL:          sw00219646000msuni0221.fits
SUN_POSTN:       116.59d {+07h 46m 22s}  +21.19d {+21d 11' 23"}
SUN_DIST:         49.45 [deg]   Sun_angle= -3.6 [hr] (East of Sun)
MOON_POSTN:       17.04d {+01h 08m 09s}   +9.20d {+09d 11' 44"}
MOON_DIST:       134.34 [deg]
MOON_ILLUM:      55 [%]
GAL_COORDS:      202.41, 70.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      159.69, 22.89 [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:     Mon 17 Jul 06 09:16:17 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     219646,   Seg_Num: 0
POINT_RA:        170.887d {+11h 23m 33s} (J2000)
POINT_DEC:       +28.953d {+28d 57' 11"} (J2000)
POINT_ROLL:      274.015d
IMG_START_DATE:  13933 TJD;   198 DOY;   06/07/17
IMG_START_TIME:  33080.17 SOD {09:11:20.17} UT,   221.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.088
N_STARS:         8
X_OFFSET:        607 [pixels]
Y_OFFSET:        437 [pixels]
X_MAX:           1566 [pixels]
Y_MAX:           1396 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00219646000msufc0221.fits
SUN_POSTN:       116.59d {+07h 46m 22s}  +21.19d {+21d 11' 23"}
SUN_DIST:         49.45 [deg]   Sun_angle= -3.6 [hr] (East of Sun)
MOON_POSTN:       17.05d {+01h 08m 12s}   +9.20d {+09d 12' 05"}
MOON_DIST:       134.33 [deg]
MOON_ILLUM:      55 [%]
GAL_COORDS:      202.41, 70.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      159.69, 22.89 [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 17 Jul 06 09:16:41 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     219646,   Seg_Num: 0
POINT_RA:        170.887d {+11h 23m 33s} (J2000)
POINT_DEC:       +28.953d {+28d 57' 11"} (J2000)
ROLL:            274.015d
IMG_START_DATE:  13933 TJD;   198 DOY;   06/07/17
IMG_START_TIME:  33080.17 SOD {09:11:20.17} UT,   221.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     174820281
X_OFFSET:        927 [pixels]
Y_OFFSET:        757 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1087
Y_GRB_POS:       917
BINNING_INDEX:   1
IM_URL:          sw00219646000msuni0221.fits
SUN_POSTN:       116.59d {+07h 46m 22s}  +21.19d {+21d 11' 23"}
SUN_DIST:         49.45 [deg]   Sun_angle= -3.6 [hr] (East of Sun)
MOON_POSTN:       17.05d {+01h 08m 13s}   +9.20d {+09d 12' 12"}
MOON_DIST:       134.33 [deg]
MOON_ILLUM:      55 [%]
GAL_COORDS:      202.41, 70.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      159.69, 22.89 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        If you have elected to receive attachments:  
COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 17 Jul 06 09:32:43 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     219646,   Seg_Num: 0
GRB_RA:          170.8410d {+11h 23m 21.8s} (J2000),
                 170.9280d {+11h 23m 42.7s} (current),
                 170.1749d {+11h 20m 41.9s} (1950)
GRB_DEC:         +28.9510d {+28d 57' 03.6"} (J2000),
                 +28.9150d {+28d 54' 54.1"} (current),
                 +29.2256d {+29d 13' 32.1"} (1950)
GRB_ERROR:       9.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       9.99e-12 [erg/cm2/sec]
GRB_SIGNIF:      3.00 [sigma]
IMG_START_DATE:  13933 TJD;   198 DOY;   06/07/17
IMG_START_TIME:  33092.00 SOD {09:11:32.00} UT,   233.1 [sec] since BAT Trigger Time
TAM[0-3]:        327.61 237.19 261.35 242.66
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       116.60d {+07h 46m 25s}  +21.19d {+21d 11' 16"}
SUN_DIST:         49.40 [deg]   Sun_angle= -3.6 [hr] (East of Sun)
MOON_POSTN:       17.20d {+01h 08m 47s}   +9.28d {+09d 16' 31"}
MOON_DIST:       134.17 [deg]
MOON_ILLUM:      55 [%]
GAL_COORDS:      202.41, 70.51 [deg] galactic lon,lat of the burst
ECL_COORDS:      159.65, 22.87 [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 #5326
T. Sakamoto (NASA/ORAU), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), S. Campana (INAF-OAB), M. Capalbi (ASDC), M.L. Conciatore (ASDC), C. Gronwall (PSU), H. A. Krimm (GSFC/USRA), K. M. McLean (LANL/UTD), K. L. Page (U Leicester), D. M. Palmer (LANL), M. Perri (ASDC), P. Romano (INAF-OAB) and L. Vetere (ASDC) report on behalf of the Swift Team:
At 09:07:38 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 060717 (trigger=219646). Swift slewed immediately to the burst. The BAT on-board calculated location is RA,Dec 170.862, +28.948 {11h 23m 27s, +28d 56' 54"} (J2000) with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single peak about 5 sec in duration with a peak count rate of 1000 counts/sec (15-350 keV).
The XRT began taking data at 09:11:15 UT, 216 seconds after the BAT trigger. The XRT on-board centroid algorithm did not find a source in the image, however analysis of TDRSS downlinked PC data reveals a faint point source at the following coordinates
```
   RA(J2000) =  11h 23m 21.9s
   Dec(J2000)= +28d 57' 05.4"
```
with an estimated uncertainty of 9 arcseconds radius (90% containment). This position lies 66 arcseconds from BAT localization.
UVOT took a finding chart exposure of 73 seconds with the White (160-650 nm) filter starting 221 seconds after the BAT trigger. No afterglow candidate has been found in the initial data products. Image catalog data are not available at this time. The 8'x8' region for the list of sources generated on-board covers 100% of the BAT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for extinction.
GCN Circular #5327
E.Sonoda, S.Maeno, M.Yamauchi (University of Miyazaki)
"We have observed the field covering the error circle of GRB060717 (GCN 5326) with the unfiltered CCD camera on the 30-cm telescope at University of Miyazaki. The observation was started 12:07:14 UT on Jul. 17. After co-adding a set of 11 images (12:07:14 - 12:18:58 UT) of 30 sec exposures, we have compared with the USNO A2.0 catalog. Preliminary analysis shows there is no new source brighter than 16.5 mag. "
GCN Circular #5329
Richard J. Cool (Arizona), Daniel J. Eisenstein (Arizona), David W. Hogg (NYU), Michael R. Blanton (NYU), David J. Schlegel (LBNL), J. Brinkmann (APO), Donald Q. Lamb (Chicago), Donald P. Schneider (PSU), and Daniel E. Vanden Berk (PSU) report:
The Sloan Digital Sky Survey (SDSS) imaged the field of burst GRB060717 prior to the burst. As these data should be useful as a pre-burst comparison and for calibrating photometry, we are supplying the images and photometry measurements for this GRB field to the community.
Data from the SDSS, including 5 FITS images, 3 JPGS, and 3 files of photometry and astrometry, are being placed at http://mizar.as.arizona.edu/~grb/public/GRB060717
We supply FITS images in each of the 5 SDSS bands of a 8'x8' region centered on the GRB position (ra=170.841 (11:23:21.8), dec=28.9150 (28:54:54.0); GCN 5326), as well as 3 gri color-composite JPGs (with different stretches). The units in the FITS images are nanomaggies per pixel. A pixel is 0.396 arcsec on a side. A nanomaggie is a flux-density unit equal to 10^-9 of a magnitude 0 source or, to the extent that SDSS is an AB system, 3.631e-6 Jy. The FITS images have WCS astrometric information.
In the file GRB060717_sdss.calstar.dat, we report photometry and astrometry of 136 bright stars (r<20.5) within 15' of the burst location. The magnitudes presented in this file are asinh magnitudes as are standard in the SDSS (Lupton 1999, AJ, 118, 1406). Beware that some of these stars are not well-detected in the u-band; use the errors and object flags to monitor data quality.
In the files GRB060717_sdss.objects_flux.dat and GRB060717_sdss.objects_magnitudes.dat, we report photometry of 842 objects detected within 6' of the GRB position. We have removed saturated objects and objects with model magnitudes fainter than 23.0 in the r-band. The fluxes listed in GRB060717_sdss.objects_flux.dat are in nanomaggies while the magnitudes listed in GRB060717_sdss.objects_magnitudes.dat are asinh magnitudes.
All quantities reported are standard SDSS photometry, meaning that they are very close to AB zeropoints and magnitudes are quoted in asinh magnitudes. Photometric zeropoints are known to about 2% rms. None of the photometry is corrected for dust extinction. The Schlegel, Finkbeiner, and Davis (1998) predictions for this region are A_U=0.091 mag, A_g=0.067 mag, A_r = 0.048 mag, A_i=0.037 mag, and A_z=0.026 mag.
There are currently no objects within 6 arcminutes of the GRB position in the SDSS spectroscopic database.
SDSS astrometry is generally better than 0.1 arcsecond per coordinate. Users requiring high precision astrometry should take note that the SDSS astrometric system can differ from other systems such as those used in other notices; we have not checked the offsets in this region.
More detailed information pertaining to our SDSS GRB releases can be found in our initial data release paper (Cool et al. 2006, astro-ph/0601218). See the SDSS DR4 documentation for more details: http://www.sdss.org/dr4.
These data have been reduced using a slightly different pipeline than that used for SDSS public data releases. We cannot guarantee that the values here will exactly match those in the data release in which these data are included. In particular, we expect the photometric calibrations to differ by of order 0.01 mag.
This note may be cited, but please also cite the SDSS data release paper, Adelman-McCarthy et al. (2006, ApJS, in press, astro-ph/0507711), when using the data or referring to the technical documentation.
GCN Circular #5330
C. Markwardt (GSFC/UMD), L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/ORAU), E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), M. Koss (GSFC/UMD), J. Norris (GSFC), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC) on behalf of the Swift-BAT team:
Using the data set from T-119 to T+183 sec from the recent telemetry downlink, we report further analysis of BAT GRB 060717 (trigger #219646) (Sakamoto, et al., GCN Circ. 5326). The BAT ground-calculated position is RA,Dec = 170.851,+28.970 deg {11h 23m 24.2s,+28d 58' 12.5"} (J2000) +- 2.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 99%.
The mask-weighted light curve shows a single peak which is most prominent in the 15-50 keV energy band and not detectable above 100 keV. T90 (15-350 keV) is 3.0 +- 1 sec (estimated error including systematics). The standard Norris lag analysis for this burst is 250 +/- 250 msec (15-25 to 50-100 keV energy bands for the CCF). This plus the soft spectrum indicate that this is not a short GRB.
The time-averaged spectrum from T-0.2 to T+2.8 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.72 +- 0.38. The fluence in the 15-150 keV band is 6.5 +- 1.6 x 10^-8 erg/cm2. The 1-sec peak photon flux measured from T+0.78 sec in the 15-150 keV band is 0.5 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
GCN Circular #5331
M. Capalbi, M. Perri (ASDC), D.N. Burrows (PSU) report on behalf of the Swift XRT team:
We have analysed the first 3 orbits of XRT data for GRB 060717 (trigger #219646, Sakamoto et al., GCN 5326). A ~2.6ks PC mode image reveals a faint (30 photons), fading X-ray source at the following coordinates:
```
RA(J2000) =   11h 23m 21.74s
Dec(J2000) = +28d 57' 03.2"
```
with an estimated uncertainty of 5.3 arcseconds (90% containment). This position lies 3 arcseconds from the XRT position given in GCN 5326 and 76.5 arcseconds from the center of the refined BAT error circle (Markwardt et al., GCN 5330).
This circular is an official product of the Swift XRT Team.

GCN Circular #5332
A. Cucchiara (PSU), P. Brown on behalf of the Swift/UVOT team:
The Swift UVOT began taking data on the field of GRB 060717 222 s after the BAT trigger (Sakamoto et al. 2006, GCN Circular 5326). No new source, relative to the DSS, is seen inside the refined XRT error circle (Capalbi et al. GCN 5331) The 3-sigma upper limits for the first finding chart and the coadded images are listed below.
Finding chart:

         Midpoint   Exposure
Filter  Time (s)     (s)          Mag
White     272        100       19.57  3-sigma upper limit (160-650 nm)

Coadded images:

Filter     T_start(s)    T_stop(s)    EXPOSURE (s)    Mag   
White    222             10309               1241              20.85  UL
V          203             11899               1079              19.62  UL
B          4436           16062               1298              20.66  UL
U          4231             5862                400              19.83  UL
UVW1     4027         5659                393              19.33  UL
UVM2     3822         5453                400              19.25  UL
UVW2     4845       11215               1099              20.51  UL

T_start and T_stop are estimated from the time of the burst. These upper limits have not been corrected for the estimated Galactic reddening of E_{B-V} = 0.064 mag (Schlegel et al. 1998).

GCN Circular #5333
A. Stefanescu, G. Kanbach, S. Duscha, F. Schrey, M. Muehlegger, N.Prymak, H. Steinle (MPE Garching) of the OPTIMA-Burst team report from the 1.3m Skinakas Observatory(University of Crete, Heraklion, Greece):
We observed the position of the refined XRT errorcircle (GCN 5331, Capalbi et al.) on 2006-07-17 at 18:55 UT (9:48h post burst). We do not detect a counterpart candidate in our 3x600s white light exposures brighter than 21mag.
GCN Circular #5335
Pall Jakobsson (U. Hertfordshire), Johan P.U. Fynbo, Jens Hjorth (DARK, NBI), Tine B. Nielsen and Karianne Holhjem (NOT, La Palma) report:
We observed the afterglow position of GRB 060717 (Sakamoto et al., GCN 5326) on July 17.906 (12.5 hr post-burst) in R-band and on July 17.922 (12.9 hr post-burst) in i-band with ALFOSC on the Nordic Optical Telescope. Inside the revised XRT error circle (Capalbi et al., GCN 5331), we find no evidence for any sources. The limiting magnitudes of our observations are R > 23.8 and i > 22.7.
The corresponding upper limit on beta_OX is 0.42, rendering the burst dark according to the definition proposed by Jakobsson et al. (2004, ApJ, 617, L21).
GCN Circular #5338
M. Capalbi, M. Perri (ASDC), D.N. Burrows (PSU), T. Sakamoto (NASA/ORAU) report on behalf of the Swift XRT team:
We have analysed the first 8 orbits of XRT data from GRB 060717 (Sakamoto et al., GCN 5326). A Photon Counting mode image (11 ks) provides a refined XRT position:
```
RA(J2000)  =3D 11h 23m 21.79s
Dec(J2000) =3D +28d 57m 03.3s
```
with an uncertainty of 4.5 arcsec (90% containment). This position is 0.7 arcsec away from the XRT position quoted in Capalbi et al. (GCN 5331).
The 0.3-10 keV X-ray light curve shows a power law decline with a decay index of -0.9 =B1 0.2.
There are only 56 counts, insufficient for spectral analysis. Assuming a photon index of 2.0 and the Galactic value for the column density (1.4e20 cm^-2), the estimated unabsorbed source flux at T+24h is about 3e-14 erg cm^-2 s^-1.
This circular is an official product of the Swift XRT Team.
GCN Circular #5431
I. Asfandyarov (MAO), A. Pozanenko (IKI), M. Ibrahimov (MAO) on behalf of larger GRB follow up collaboration report:
We observed the field of GRB060717 (Sakamoto et al., GCN 5326) with 1.5 m telescope of Maidanak Astronomical Observatory (MAO) on July 17, (UT) 16:02 - 16:19. We do no detect optical sources in R-band within refined XRT error box (Capalbi et al., GCN 5338). Based on USNO A2.0 we estimate limiting (3 sigma) magnitude of a combined image:
```
Mid time T0+ (hrs), Exposure, R_lim

7.05                840 sec   20.9
```
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Note from March 4, 2021
The redshift of z=2.71 in Simbad and referenced with 2009ApJ...690..163R (Roming: The first Swift ultraviolet/optical telescope GRB afterglow catalog) refers to GRB 060714, not to 060717.

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Jochen Greiner, last update: 04-Mar-2021 [Disclaimer]