batgrbproduct Analysis for Trigger=222546
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 23:04:09 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger222546/GCN5_download_cron
======================================================================
Trigger: 00222546 Segment: 000
BAT Trigger Time: 176369301.184 [s; MET]
Trigger Stop: 176369309.376 [s; MET]
UTC: 2006-08-04T07:28:19.825160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 112.201199296934 Dec: -27.2313754670281 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.92
Image Trigger?: NO
Rate S/N Ratio: 10.816653826392 [ if not an image trigger ]
Image S/N Ratio: 8.92
Flight Position: [ source = BAT ]
RA: 112.201199296934 Dec: -27.2313754670281 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 112.215515440796 Dec: -27.2229834008936 [deg; J2000]
{ 07h 28m 51.7s , -27d 13' 22.7" }
+/- 2.02893525621494 [arcmin] (estimated 90% radius based on SNR)
+/- 0.99302929156143 [arcmin] (formal 1-sigma fit error)
SNR: 11.0704130325993
RA = 7h 28m 51.7s (112.215515 deg.)
Dec = -27d 13' 23" (-27.222983 deg.)
Angular difference between Flight and Ground position is 0.914832 arcmin
Partial Coding Fraction: 0.1894531 [ including projection effects ]
Duration
T90: 17.8280000090599 +/- 2.26890280875323
Measured from: -10.9879999756813
to: 6.8400000333786 [s; relative to TRIGTIME]
T50: 9.15200001001358 +/- 4.0227478332896
Measured from: -4.4879999756813
to: 4.66400003433228 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.5160000026226
to: 5.5160000026226 [s; relative to TRIGTIME]
Total Fluence
Measured from: -12.2999999821186
to: 7.37200000882149 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.282536 0.442627 0.202595 0.099179
0.048030 0.049097 0.043388 0.038265 [error]
Peak 0.032919 0.047508 0.040997 0.026929
0.011263 0.011633 0.010606 0.008518 [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 1.03e-07 1.64e-07 1.97e-07 4.64e-07 5.98e-07 9.34e-07 erg/cm2
Error 2.31e-08 2.37e-08 4.18e-08 2.04e-07 9.86e-08 2.42e-07 erg/cm2
Peak flux Power-law 3.28e-01 3.67e-01 2.94e-01 3.90e-01 1.13e+00 1.38e+00 ph/cm2/s
Error 1.64e-01 1.08e-01 8.01e-02 2.44e-01 2.89e-01 3.27e-01 ph/cm2/s
Fluence Cutoff-PL 1.02e-07 1.67e-07 1.98e-07 3.77e-07 5.91e-07 7.66e-07 erg/cm2
Error 2.43e-08 2.20e-08 4.40e-08 2.73e-07 1.14e-07 3.53e-07 erg/cm2
Peak flux Cutoff-PL 3.28e-01 3.67e-01 2.94e-01 3.88e-01 1.13e+00 1.38e+00 ph/cm2/s
Error 1.64e-01 1.08e-01 8.02e-02 2.43e-01 2.89e-01 3.26e-01 ph/cm2/s
Fluence Band 9.47e-08 1.84e-07 1.84e-07 3.18e-07 5.69e-07 7.84e-07 erg/cm2
Error 3.62e-08 3.63e-08 4.47e-08 2.76e-07 9.86e-08 1.72e-07 erg/cm2
Peak flux Band 2.74e-01 3.50e-01 3.01e-01 4.32e-01 1.13e+00 1.39e+00 ph/cm2/s
Error 6.39e-02 7.09e-02 7.15e-02 2.75e-01 3.29e-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 1.733 0.257 - - 3.29e-03 5.19e-04 58.754 57
CPL 1.607 0.844 136.8 5000.0 3.87e-03 1.11e-02 58.748 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.322 0.470 - - 9.46e-03 2.22e-03 61.062 57
CPL 1.319 0.473 9996.3 5000.0 9.49e-03 2.23e-03 61.073 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: 7.936000 sec.
T50 in the 50-300 keV band: 4.352000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 19.672 -12.300 7.372
T90 17.828 -10.988 6.840
T50 9.152 -4.488 4.664
Peak 1.000 4.516 5.516
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
112.2155 -27.2230 0.0174 36.9 -95.8 1.1449 11.1 TRIG_00222546
------------------------------------------
Foreground time interval of the image:
-12.300 7.372 (delta_t = 19.672 [sec])
Background time interval of the image:
-239.184 -12.300 (delta_t = 226.884 [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 -12.300 sec. to 7.372 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73254 ( -0.253609 0.260207 )
Norm@50keV : 3.288982E-03 ( -5.249649E-04 5.138300E-04) )
------------------------------------------------------------
Chi-Squared = 58.75407 using 59 PHA bins.
Reduced chi-squared = 1.030773 for 57 degrees of freedom
Null hypothesis probability = 0.411
Photon flux (15-150 keV) in 19.67 sec: 0.441897 ( -0.064284 0.064354 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.97577e-07 ( -9.7754e-08 9.94614e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -12.300 sec. to 7.372 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60728 ( -1.30214 0.385304 )
Epeak [keV] : 136.794 ( -136.784 9863.21 )
Norm@50keV : 3.874290E-03 ( -3.874290E-03 1.839398E-02) )
------------------------------------------------------------
Chi-Squared = 58.74817 using 59 PHA bins.
Reduced chi-squared = 1.049074 for 56 degrees of freedom
Null hypothesis probability = 0.375
Photon flux (15-150 keV) in 19.67 sec: 0.440862 ( -0.065268 0.065013 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.91449e-07 ( -1.22298e-07 1.05478e-07 ) ergs/cm2
Band function
Time interval is from -12.300 sec. to 7.372 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.380598 ( -9.61940 5.05478 )
beta : -1.99739 ( -0.879116 0.422190 )
Epeak [keV] : 40.3849 ( -40.2849 9959.62 )
Norm@50keV : 2.450746E-02 ( -0.210187 106.836 )
------------------------------------------------------------
Chi-Squared = 56.88486 using 59 PHA bins.
Reduced chi-squared = 1.034270 for 55 degrees of freedom
Null hypothesis probability = 0.405
Photon flux (15-150 keV) in 19.67 sec: 0.436981 ( -0.068345 0.063916 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.69374e-07 ( -1.05742e-07 9.15324e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 4.516 sec. to 5.516 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32190 ( -0.480600 0.458706 )
Norm@50keV : 9.456279E-03 ( -2.221273E-03 2.216998E-03) )
------------------------------------------------------------
Chi-Squared = 61.06235 using 59 PHA bins.
Reduced chi-squared = 1.071269 for 57 degrees of freedom
Null hypothesis probability = 0.332
Photon flux (15-150 keV) in 1.000 sec: 1.13281 ( -0.288501 0.28969 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.30022e-08 ( -2.33951e-08 2.33868e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.516 sec. to 5.516 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31872 ( -0.484133 0.461492 )
Epeak [keV] : 9996.29 ( -9996.28 3.70996 )
Norm@50keV : 9.494846E-03 ( -2.227843E-03 2.225161E-03) )
------------------------------------------------------------
Chi-Squared = 61.07281 using 59 PHA bins.
Reduced chi-squared = 1.090586 for 56 degrees of freedom
Null hypothesis probability = 0.299
Photon flux (15-150 keV) in 1.000 sec: 1.13236 ( -0.288422 0.28961 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.29485e-08 ( -2.33011e-08 2.34425e-08 ) ergs/cm2
Band function
Time interval is from 4.516 sec. to 5.516 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.06890 ( -8.93110 5.85543 )
beta : -1.32184 ( -8.67816 0.480555 )
Epeak [keV] : 35.5414 ( -35.4414 9964.46 )
Norm@50keV : 1.846029E-02 ( -1.846029E-02 3.05910 )
------------------------------------------------------------
Chi-Squared = 61.06235 using 59 PHA bins.
Reduced chi-squared = 1.110224 for 55 degrees of freedom
Null hypothesis probability = 0.267
Photon flux (15-150 keV) in 1.000 sec: 1.13073 ( -0.285964 0.26474 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.2873e-08 ( -2.33078e-08 2.3418e-08 ) ergs/cm2
Plot creation:
Tue Jan 1 23:29:17 EST 2008