batgrbproduct Analysis for Trigger=211117
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 13:24:37 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger211117/SDC
======================================================================
Trigger: 00211117 Segment: 000
BAT Trigger Time: 169956680 [s; MET]
Trigger Stop: 169956744 [s; MET]
UTC: 2006-05-22T02:11:18.792140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 322.950749367837 Dec: 2.87593922853813 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 13.36
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 13.36
Flight Position: [ source = BAT ]
RA: 322.950749367837 Dec: 2.87593922853813 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 322.95853362184 Dec: 2.89100903165226 [deg; J2000]
{ 21h 31m 50.0s , +02d 53' 27.6" }
+/- 1.49845920645844 [arcmin] (estimated 90% radius based on SNR)
+/- 0.47312543648407 [arcmin] (formal 1-sigma fit error)
SNR: 17.0685669307687
RA = 21h 31m 50.0s (322.958534 deg.)
Dec = 2d 53' 28" (2.891009 deg.)
Angular difference between Flight and Ground position is 1.017421 arcmin
Partial Coding Fraction: 0.75 [ including projection effects ]
Duration
T90: 64.0000000298023 +/- 5.75480670605174
Measured from: 5.34799998998642
to: 69.3480000197887 [s; relative to TRIGTIME]
T50: 34.3880000114441 +/- 8.94166091228717
Measured from: 25.3959999978542
to: 59.7840000092983 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.40799999237061
to: 5.40799999237061 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.164000004529953
to: 78.6439999938011 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.451849 0.759923 0.442054 0.099577
0.050249 0.051806 0.048059 0.048093 [error]
Peak 0.019673 0.027442 0.010109 0.005191
0.005911 0.006041 0.005326 0.005382 [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 1.64e-07 2.91e-07 3.94e-07 1.10e-06 1.14e-06 1.95e-06 erg/cm2
Error 2.37e-08 2.58e-08 4.65e-08 2.77e-07 1.11e-07 3.14e-07 erg/cm2
Peak flux Power-law 2.54e-01 1.81e-01 8.48e-02 5.59e-02 5.46e-01 5.75e-01 ph/cm2/s
Error 9.12e-02 5.05e-02 4.07e-02 5.07e-02 1.49e-01 1.60e-01 ph/cm2/s
Fluence Cutoff-PL 1.47e-07 3.15e-07 4.05e-07 3.84e-07 1.07e-06 1.35e-06 erg/cm2
Error 2.86e-08 3.44e-08 5.23e-08 4.05e-07 1.29e-07 4.38e-07 erg/cm2
Peak flux Cutoff-PL 2.18e-01 2.27e-01 7.27e-02 4.96e-03 5.22e-01 5.23e-01 ph/cm2/s
Error 1.08e-01 7.85e-02 5.15e-02 4.54e-02 1.51e-01 1.52e-01 ph/cm2/s
Fluence Band 1.45e-07 3.17e-07 3.90e-07 7.42e-07 1.09e-06 1.59e-06 erg/cm2
Error 3.27e-08 4.01e-08 5.82e-08 5.65e-07 1.17e-07 4.82e-07 erg/cm2
Peak flux Band 2.29e-01 2.27e-01 7.34e-02 8.42e-03 5.23e-01 5.28e-01 ph/cm2/s
Error 7.11e-02 6.81e-02 3.66e-02 4.46e-02 1.46e-01 1.45e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.561 0.153 - - 1.55e-03 1.38e-04 70.553 57
CPL 0.797 0.757 75.6 110.7 3.86e-03 5.14e-03 66.919 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.091 0.522 - - 3.49e-03 1.30e-03 51.832 57
CPL 0.159 2.639 36.8 5000.0 5.14e-02 1.37e+00 50.131 0
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: 80.768000 sec.
T50 in the 50-300 keV band: 35.136000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 78.480 0.164 78.644
T90 64.000 5.348 69.348
T50 34.388 25.396 59.784
Peak 1.000 4.408 5.408
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
322.9585 +2.8910 0.0113 31.9 177.1 1.8975 17.1 TRIG_00211117
------------------------------------------
Foreground time interval of the image:
0.164 76.805 (delta_t = 76.641 [sec])
Background time interval of the image:
-239.000 0.164 (delta_t = 239.164 [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 0.164 sec. to 78.644 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56086 ( -0.151830 0.153593 )
Norm@50keV : 1.547670E-03 ( -1.386717E-04 1.375099E-04) )
------------------------------------------------------------
Chi-Squared = 70.55318 using 59 PHA bins.
Reduced chi-squared = 1.237775 for 57 degrees of freedom
Null hypothesis probability = 0.107
Photon flux (15-150 keV) in 78.48 sec: 0.196546 ( -0.01714 0.017165 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.14175e-06 ( -1.10759e-07 1.11881e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.164 sec. to 78.644 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.797480 ( -0.826928 0.686775 )
Epeak [keV] : 75.6038 ( -18.3936 203.025 )
Norm@50keV : 3.860534E-03 ( -3.860534E-03 6.417214E-03) )
------------------------------------------------------------
Chi-Squared = 66.91928 using 59 PHA bins.
Reduced chi-squared = 1.194987 for 56 degrees of freedom
Null hypothesis probability = 0.151
Photon flux (15-150 keV) in 78.48 sec: 0.189910 ( -0.018346 0.018175 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07119e-06 ( -1.28684e-07 1.29633e-07 ) ergs/cm2
Band function
Time interval is from 0.164 sec. to 78.644 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.921986 ( -1.37191 1.55132 )
beta : -2.14635 ( -7.99831 0.380152 )
Epeak [keV] : 79.6478 ( -32.2035 76.3135 )
Norm@50keV : 3.381323E-03 ( -4.744428E-03 0.132073 )
------------------------------------------------------------
Chi-Squared = 66.89335 using 59 PHA bins.
Reduced chi-squared = 1.216243 for 55 degrees of freedom
Null hypothesis probability = 0.131
Photon flux (15-150 keV) in 78.48 sec: 0.190060 ( -0.018489 0.017514 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.08899e-06 ( -1.16739e-07 1.17547e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 4.408 sec. to 5.408 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.09114 ( -0.476569 0.568294 )
Norm@50keV : 3.486354E-03 ( -1.322612E-03 1.268924E-03) )
------------------------------------------------------------
Chi-Squared = 51.83208 using 59 PHA bins.
Reduced chi-squared = 0.9093347 for 57 degrees of freedom
Null hypothesis probability = 0.669
Photon flux (15-150 keV) in 1.000 sec: 0.546211 ( -0.149444 0.149456 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.2378e-08 ( -1.06715e-08 1.13559e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.408 sec. to 5.408 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.158521 ( -3.15852 2.12035 )
Epeak [keV] : 36.7934 ( -36.7834 9963.21 )
Norm@50keV : 5.143860E-02 ( -5.143860E-02 2.69420 )
------------------------------------------------------------
Chi-Squared = 50.13102 using 59 PHA bins.
but latest trial 2.12638 gives Chi-Squared = 1.71546
Reduced chi-squared = 0.8951967 for 56 degrees of freedom
Null hypothesis probability = 0.696
Photon flux (15-150 keV) in 1.000 sec: 0.522255 ( -0.14965 0.151372 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.78439e-08 ( -8.664e-09 1.21509e-08 ) ergs/cm2
Band function
Time interval is from 4.408 sec. to 5.408 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.563818E-02 ( -10.0156 4.69911 )
beta : -9.37156 ( -0.628441 19.3715 )
Epeak [keV] : 36.8818 ( -36.7818 9963.12 )
Norm@50keV : 6.542242E-02 ( -1.748792E-02 2403.74 )
------------------------------------------------------------
Chi-Squared = 50.12027 using 59 PHA bins.
Reduced chi-squared = 0.9112777 for 55 degrees of freedom
Null hypothesis probability = 0.661
Photon flux (15-150 keV) in 1.000 sec: 0.523345 ( -0.148445 0.143903 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.82824e-08 ( -9.3917e-09 1.22011e-08 ) ergs/cm2
Plot creation:
Tue Jan 1 13:45:04 EST 2008