batgrbproduct Analysis for Trigger=216568
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.41
Process Start Time (local time): Tue Jan 1 19:16:04 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger216568/GCN5_download_cron
======================================================================
Trigger: 00216568 Segment: 000
BAT Trigger Time: 173403504 [s; MET]
Trigger Stop: 173403568 [s; MET]
UTC: 2006-06-30T23:38:22.711300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 308.036919807042 Dec: 37.6440789320738 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 17.57
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 17.57
Flight Position: [ source = BAT ]
RA: 308.036919807042 Dec: 37.6440789320738 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 308.060786700995 Dec: 37.6671839171752 [deg; J2000]
{ 20h 32m 14.6s , +37d 40' 01.9" }
+/- 3.53533931243753 [arcmin] (estimated 90% radius based on SNR)
+/- 1.92929959217654 [arcmin] (formal 1-sigma fit error)
SNR: 5.00778155642011
RA = 20h 32m 14.6s (308.060787 deg.)
Dec = 37d 40' 2" (37.667184 deg.)
Angular difference between Flight and Ground position is 1.790851 arcmin
Partial Coding Fraction: 0.875 [ including projection effects ]
Duration
T90: 7 +/- 3.16227766016838
Measured from: 2
to: 9 [s; relative to TRIGTIME]
T50: 2 +/- 2.82842712474619
Measured from: 4
to: 6 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5
to: 6 [s; relative to TRIGTIME]
Total Fluence
Measured from: 2
to: 9 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.147284 0.112296 0.032589 0.008331
0.015160 0.014853 0.012391 0.010513 [error]
Peak 0.024539 0.012586 0.011977 0.010355
0.005863 0.005591 0.004704 0.003937 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 4.79e-08 4.80e-08 3.38e-08 3.78e-08 1.45e-07 1.68e-07 erg/cm2
Error 7.97e-09 7.52e-09 1.03e-08 2.14e-08 2.48e-08 3.71e-08 erg/cm2
Peak flux Power-law 1.95e-01 1.43e-01 6.97e-02 4.80e-02 4.31e-01 4.56e-01 ph/cm2/s
Error 1.00e-01 4.73e-02 5.64e-02 6.32e-02 1.42e-01 1.50e-01 ph/cm2/s
Fluence Cutoff-PL 4.68e-08 5.45e-08 2.37e-08 3.03e-09 1.28e-07 1.28e-07 erg/cm2
Error 8.54e-09 1.01e-08 1.49e-08 1.76e-08 2.57e-08 3.25e-08 erg/cm2
Peak flux Cutoff-PL 1.95e-01 1.43e-01 6.96e-02 4.77e-02 4.31e-01 4.56e-01 ph/cm2/s
Error 1.00e-01 4.73e-02 5.64e-02 6.28e-02 1.42e-01 1.50e-01 ph/cm2/s
Fluence Band 4.64e-08 5.40e-08 2.49e-08 7.95e-09 1.33e-07 1.30e-07 erg/cm2
Error 6.40e-09 1.04e-08 1.11e-08 1.99e-08 2.46e-08 4.18e-08 erg/cm2
Peak flux Band 1.95e-01 1.44e-01 7.04e-02 4.88e-02 4.33e-01 4.60e-01 ph/cm2/s
Error 1.02e-01 4.73e-02 3.23e-02 3.47e-02 1.42e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.506 0.291 - - 2.06e-03 4.67e-04 64.972 57
CPL 1.102 1.473 21.1 15.1 1.76e-02 2.41e-01 61.998 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.039 0.810 - - 2.82e-03 1.30e-03 56.692 57
CPL 2.080 0.000 35.5 4979.9 2.40e-03 0.00e+00 56.477 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 7.000 2.000 9.000
T90 7.000 2.000 9.000
T50 2.000 4.000 6.000
Peak 1.000 5.000 6.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
308.0608 +37.6672 0.0384 28.9 -21.9 0.1680 5.0 TRIG_00216568
------------------------------------------
Foreground time interval of the image:
2.000 9.000 (delta_t = 7.000 [sec])
Background time interval of the image:
-10.000 2.000 (delta_t = 12.000 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 5) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 2.000 sec. to 9.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.50584 ( -0.275636 0.305594 )
Norm@50keV : 2.063099E-03 ( -4.670055E-04 4.664166E-04) )
------------------------------------------------------------
Chi-Squared = 64.97184 using 59 PHA bins.
Reduced chi-squared = 1.139857 for 57 degrees of freedom
Null hypothesis probability = 0.219
Photon flux (15-150 keV) in 7.000 sec: 0.406735 ( -0.055745 0.05575 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.44637e-07 ( -2.42347e-08 2.52672e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.000 sec. to 9.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10173 ( -2.05205 0.893546 )
Epeak [keV] : 21.1271 ( -21.1171 9.06875 )
Norm@50keV : 1.760922E-02 ( -1.760922E-02 0.464406 )
------------------------------------------------------------
Chi-Squared = 61.99809 using 59 PHA bins.
Reduced chi-squared = 1.107109 for 56 degrees of freedom
Null hypothesis probability = 0.271
Photon flux (15-150 keV) in 7.000 sec: 0.395996 ( -0.055687 0.056097 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27798e-07 ( -2.31532e-08 2.82296e-08 ) ergs/cm2
Band function
Time interval is from 2.000 sec. to 9.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.59594 ( -8.40406 0.522993 )
beta : -9.11364 ( -5.64746 1.96927 )
Epeak [keV] : 15.8382 ( -15.4995 14.9886 )
Norm@50keV : 7.950549E-03 ( -26.8398 508.025 )
------------------------------------------------------------
Chi-Squared = 62.38301 using 59 PHA bins.
Reduced chi-squared = 1.134237 for 55 degrees of freedom
Null hypothesis probability = 0.230
Photon flux (15-150 keV) in 7.000 sec: 0.401197 ( -0.059548 0.057277 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32966e-07 ( -2.55913e-08 2.36957e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 5.000 sec. to 6.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.03944 ( -0.720193 0.899269 )
Norm@50keV : 2.820976E-03 ( -1.408439E-03 1.198258E-03) )
------------------------------------------------------------
Chi-Squared = 56.69175 using 59 PHA bins.
Reduced chi-squared = 0.9945921 for 57 degrees of freedom
Null hypothesis probability = 0.487
Photon flux (15-150 keV) in 1.000 sec: 0.431067 ( -0.141873 0.141732 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.60666e-08 ( -1.05667e-08 1.11687e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.000 sec. to 6.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.07966 ( )
Epeak [keV] : 35.5288 ( -6.89582 9952.88 )
Norm@50keV : 2.403472E-03 ( )
------------------------------------------------------------
Chi-Squared = 56.47724 using 59 PHA bins.
Reduced chi-squared = 1.008522 for 56 degrees of freedom
Null hypothesis probability = 0.457
Photon flux (15-150 keV) in 1.000 sec: 0.430871 ( -0.141828 0.141689 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.60693e-08 ( -1.05772e-08 1.11626e-08 ) ergs/cm2
Band function
Time interval is from 5.000 sec. to 6.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.51614 ( -14.9963 3.669739E-03) )
beta : -2.02703 ( -1.08356 0.699752 )
Epeak [keV] : 15.8576 ( -15.7576 184.790 )
Norm@50keV : 8.268115E-03 ( -9901.21 4.210668E+06) )
------------------------------------------------------------
Chi-Squared = 56.68666 using 59 PHA bins.
Reduced chi-squared = 1.030667 for 55 degrees of freedom
Null hypothesis probability = 0.412
Photon flux (15-150 keV) in 1.000 sec: 0.433180 ( -0.14141 0.141769 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.65574e-08 ( -8.968e-09 2.9209e-07 ) ergs/cm2
Plot creation:
Tue Jan 1 19:20:26 EST 2008