Gamma-ray Burst 060712

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 12 Jul 06 21:09:20 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     218582,   Seg_Num: 0
GRB_RA:          184.061d {+12h 16m 15s} (J2000),
                 184.143d {+12h 16m 34s} (current),
                 183.434d {+12h 13m 44s} (1950)
GRB_DEC:         +35.560d {+35d 33' 35"} (J2000),
                 +35.523d {+35d 31' 24"} (current),
                 +35.837d {+35d 50' 15"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       109635 [cnts]    Image_Peak=544 [image_cnts]
TRIGGER_DUR:     26.880 [sec] 
TRIGGER_INDEX:   480     E_range: 25-100 keV
BKG_INTEN:       250542 [cnts]
BKG_TIME:        75950.68 SOD {21:05:50.68} UT
BKG_DUR:         64 [sec]
GRB_DATE:        13928 TJD;   193 DOY;   06/07/12
GRB_TIME:        76063.71 SOD {21:07:43.71} UT
GRB_PHI:          -4.98 [deg]
GRB_THETA:        55.56 [deg]
SOLN_STATUS:     0x83
RATE_SIGNIF:     10.39 [sigma]
IMAGE_SIGNIF:    6.67 [sigma]
MERIT_PARAMS:     +1  +0  +0  +5  +2  +0  +0  +0 -45  +1 
SUN_POSTN:       112.03d {+07h 28m 08s}  +21.89d {+21d 53' 36"}
SUN_DIST:         63.34 [deg]   Sun_angle= -4.8 [hr] (East of Sun)
MOON_POSTN:      317.70d {+21h 10m 49s}  -19.98d {-19d 58' 33"}
MOON_DIST:       136.52 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      162.42, 78.72 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      167.60, 33.81 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This Notice was delayed by more than 60 sec past the end of the trigger integration interval;  
COMMENTS:        probably due to it occurring during a Malindi downlink session.  
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 = 265.02,6.53 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 12 Jul 06 21:11:30 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     218582,   Seg_Num: 0
POINT_RA:        184.081d {+12h 16m 19s} (J2000)
POINT_DEC:       +35.544d {+35d 32' 38"} (J2000)
IMG_START_DATE:  13928 TJD;   193 DOY;   06/07/12
IMG_START_TIME:  76247.33 SOD {21:10:47.33} UT,   183.6 [sec] since BAT Trigger Time
COUNTS:          7    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:     Wed 12 Jul 06 21:12:57 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     218582,   Seg_Num: 0
GRB_RA:          184.061d {+12h 16m 15s} (J2000),
                 184.143d {+12h 16m 34s} (current),
                 183.434d {+12h 13m 44s} (1950)
GRB_DEC:         +35.560d {+35d 33' 35"} (J2000),
                 +35.523d {+35d 31' 24"} (current),
                 +35.837d {+35d 50' 15"} (1950)
GRB_DATE:        13928 TJD;   193 DOY;   06/07/12
GRB_TIME:        76063.71 SOD {21:07:43.71} UT
TRIGGER_INDEX:   480
GRB_PHI:          -4.98 [deg]
GRB_THETA:        55.56 [deg]
DELTA_TIME:      57.00 [sec]
TRIGGER_DUR:     26.880 [sec] 
SOLN_STATUS:     0x83
RATE_SIGNIF:     10.39 [sigma]
IMAGE_SIGNIF:    6.67 [sigma]
LC_URL:          sw00218582000msb.lc
SUN_POSTN:       112.04d {+07h 28m 09s}  +21.89d {+21d 53' 34"}
SUN_DIST:         63.34 [deg]   Sun_angle= -4.8 [hr] (East of Sun)
MOON_POSTN:      317.74d {+21h 10m 58s}  -19.96d {-19d 57' 46"}
MOON_DIST:       136.54 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      162.42, 78.72 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      167.60, 33.81 [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 = 265.02,6.53 [deg].

GCN Circular #5301
J. R. Cummings (NASA/ORAU), S. D. Barthelmy (GSFC), C. Gronwall (PSU), S. T. Holland (GSFC/USRA), J. A. Kennea (PSU), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), M. Perri (ASDC), M. Stamatikos (NASA/ORAU) and L. Vetere (ASDC) report on behalf of the Swift Team:
At 21:07:43 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 060712 (trigger=218582). Swift slewed immediately to the burst. The BAT on-board calculated location is RA,Dec 184.061, +35.560 {12h 16m 15s, +35d 33' 35"} (J2000) with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows very little structure above background. This is a 6.7-sigma detection in BAT spread over ~26 sec so little is expected to be seen in the BAT lightcurve. The peak count rate was ~500 counts/sec (15-350 keV).
The XRT began taking data at 21:10:47 UT, 184 seconds after the BAT trigger. The XRT on-board centroid algorithm did not find a source in the image and no prompt position is available. However analysis of the downlinked Photon Counting mode data reveals a point source at the following coordinates: RA(J2000) = 12:16:16.3, Dec(J2000) = +35:32:17.7 with an error radius of 4.2 arcseconds (90% confidence). This position is 81 arcseconds from the BAT position.
UVOT was in an engineering mode, so no UVOT data are currently available.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 12 Jul 06 21:31:55 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     218582,   Seg_Num: 0
GRB_RA:          184.0680d {+12h 16m 16.3s} (J2000),
                 184.1498d {+12h 16m 35.9s} (current),
                 183.4406d {+12h 13m 45.7s} (1950)
GRB_DEC:         +35.5382d {+35d 32' 17.5"} (J2000),
                 +35.5019d {+35d 30' 07.0"} (current),
                 +35.8160d {+35d 48' 57.6"} (1950)
GRB_ERROR:       4.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       5.00e-11 [erg/cm2/sec]
GRB_SIGNIF:      5.00 [sigma]
IMG_START_DATE:  13928 TJD;   193 DOY;   06/07/12
IMG_START_TIME:  76257.50 SOD {21:10:57.50} UT,   193.8 [sec] since BAT Trigger Time
TAM[0-3]:        327.61 237.19 261.35 242.66
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       112.05d {+07h 28m 12s}  +21.89d {+21d 53' 28"}
SUN_DIST:         63.34 [deg]   Sun_angle= -4.8 [hr] (East of Sun)
MOON_POSTN:      317.93d {+21h 11m 44s}  -19.89d {-19d 53' 41"}
MOON_DIST:       136.66 [deg]
MOON_ILLUM:      96 [%]
GAL_COORDS:      162.48, 78.74 [deg] galactic lon,lat of the burst
ECL_COORDS:      167.61, 33.80 [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 #5303
V. Lipunov, V.Kornilov, D.Kuvshinov, N.Tyurina, A.Belinski, E.Gorbovskoy, A.Krylov, G.Borisov, A.Sankovich, M.Sinitsin, P.Gritsyk
Sternberg Astronomical Institute, Moscow Union 'Optic' MASTER robotic system (http://observ.pereplet.ru) responded to GRBGRB060712 (GRB_TIME is 2006-03-19 21:07:43.71) at high zenit distance jn the west at white night.
The first R image was at 2006-07-12 21:10:32 UT, 72 s after notice time and 212 s after the GRB time
The robot not find OT-candidate in error box brighter then 14.5 (s/n=3).
The reduction is continuing. This work is supported by RFFI 04-02-16411 grant. This message can be cited. Mailto: lipunov@sai.msu.ru
GCN Circular #5304
D. Hullinger (BYU-Idaho), L. Barbier (GSFC), S. D. Barthelmy (GSFC), J. Cummings (GSFC/ORAU), E. Fenimore (LANL), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), M. Koss (GSFC/UMD), 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) on behalf of the Swift-BAT team:
Using the data set from T-119 to T+183 sec from recent telemetry downlinks, we report further analysis of BAT GRB 060712 (trigger #218582) (Cummings, et al., GCN Circ. 5301). The BAT ground-calculated position is RA,Dec = 184.065, +35.539 deg {12h 16m 15.7s, +35d 32' 21.6"} (J2000) +- 2.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 9%.
The lightcurve for this weak source shows approximately 3 overlapping peaks starting at T_zero and lasting unit ~T+35 sec. T90 (15-350 keV) is 26 +- 5 sec (estimated error including systematics).
The time-averaged spectrum from T+0.6 to T+29.7 is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.64 +- 0.32. The fluence in the 15-150 keV band is 1.3 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+16.76 sec in the 15-150 keV band is 1.7 +- 0.6 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
GCN Circular #5305
L. Vetere (ADSC), M.L.Conciatore (ASDC), J. R. Cummings (NASA/ORAU) report on behalf of the Swift/XRT team:
XRT started observing the field of GRB060712 193 s after BAT trigger in PC mode. The 2.2 ks analysis of the first two orbits provides the refined XRT position:
```
RA(J2000)  =  12h 16m 16.3s,
Dec(J2000) = +35d 32m 17.8s
```
with an uncertainty of 3.8 arcsec (90% containment). This position is 0.1 arcsec away from the XRT position quoted in Cummings et al. (GCN5301) and 8.2" arcseconds from the refined BAT position (GCN5304).
The light curve shows a fast initial decay. Further osbervations are ongoing.
This circular is an official product of the Swift XRT Team.
GCN Circular #5307
GRB 060712: Swift/UVOT Upper Limits
S. T. Holland (GSFC/USRA) reports on behalf of the Swift/UVOT team:
The Swift UVOT began taking data on the field of GRB 060712 (Swift Trigger 218582) 4983 s after the BAT trigger (Cummings et al. 2006, GCN Circular 5301). UVOT was in an engineering mode when the burst occurred so it did not make prompt observations of the field of this burst. No new source, relative to the DSS, is seen in any of the UVOT exposures inside the XRT error circle (Vetere et al. 2006, GCN Circular 5305). The 3-sigma upper limits are:
```
         Midpoint   Exposure
Filte r  Time (s)     (s)       Mag
    V      5141       197      19.44  3-sigma upper limit
    B      5959       197      20.64  3-sigma upper limit
    U      5754       197      20.06  3-sigma upper limit
  UVW1     5550       197      20.16  3-sigma upper limit
  UVM2     5345       197      19.38  3-sigma upper limit
 White     4985        98      19.88  3-sigma upper limit (160-650 nm)
```
These upper limits have not been corrected for the estimated Galactic reddening of E_{B-V} = 0.01 mag (Schlegel et al. 1998).
GCN Circular #5308
L. Vetere, M.L. Conciatore (ASDC), J. R. Cummings (NASA/ORAU) report on behalf of the Swift/XRT team:
We have analysed the first 10 orbits of X-ray data for GRB 060712 for a total exposure time of 18 ks (up to ~14.5 h since the BAT trigger).
The PC light curve, from 300 s after the BAT trigger can be fitted with a single powerlaw with decay index of 0.65 +/- 0.06.
The 0.3-10 keV PC spectrum is well fitted by an absorbed power law with photon index of 2.7 +/- 0.4 with an nH value of (1.6 +/-0.9)e21 cm^-2, greater than the Galactic value of 0.13e21 cm^-2.
The predicted unabsorbed flux at 24 hours after the BAT trigger is 6.8e-13 ergs cm^-2 s^-1.
This circular is an official product of the Swift XRT Team.
GCN Circular #5309
S. B. Cenko and E. O. Ofek (Caltech) report on behalf of a larger collaboration:
We have imaged the field of GRB 060712 (Cummings et al; GCN 5301) with the automated Palomar 60-inch telescope. Observations consisted of 5 x 180 s exposures in the Kron R and Sloan i' filters taken at a mean epoch of approximately UT July 13.22 (~ 8.3 hours after the burst). Inside the revised XRT error circle (Vetere et al; GCN 5305), we find no evidence for any sources. The limiting magnitude of our observation is R < 20.5.

Back to JG's homepage

Jochen Greiner, last update: 13-Jul-2006 [Disclaimer]