batgrbproduct Analysis for Trigger=243690
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): Wed Jan 2 15:24:51 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger243690/GCN5_download_cron
======================================================================
Trigger: 00243690 Segment: 000
BAT Trigger Time: 187446040.928 [s; MET]
Trigger Stop: 187446041.312 [s; MET]
UTC: 2006-12-10T12:20:39.303180 [includes UTCF correction]
Where From?: (*SHORT BURST*) Expanded to TRIGTIME - 32 ms to TRIGTIME + 320 ms
BAT
RA: 144.513866649245 Dec: 15.6321041191689 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.35
Image Trigger?: NO
Rate S/N Ratio: 211.501773042214 [ if not an image trigger ]
Image S/N Ratio: 12.35
Flight Position: [ source = BAT ]
RA: 144.513866649245 Dec: 15.6321041191689 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 144.521412081095 Dec: 15.6177352498841 [deg; J2000]
{ 09h 38m 05.1s , +15d 37' 03.8" }
+/- 2.36941042927498 [arcmin] (estimated 90% radius based on SNR)
+/- 1.45153933201656 [arcmin] (formal 1-sigma fit error)
SNR: 8.86988435402013
RA = 9h 38m 5.1s (144.521412 deg.)
Dec = 15d 37' 4" (15.617735 deg.)
Angular difference between Flight and Ground position is 0.966108 arcmin
Partial Coding Fraction: 0.3046875 [ including projection effects ]
Duration
T90: 85.2480000257492 +/- 11.3820175559932
Measured from: 0.255999982357025
to: 85.5040000081062 [s; relative to TRIGTIME]
T50: 49.608000010252 +/- 20.0730035574524
Measured from: 6.65599998831749
to: 56.2639999985695 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0180000066757202
to: 1.01800000667572 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.243999987840652
to: 89.6399999856949 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.486370 0.601952 0.490628 0.081691
0.083250 0.083454 0.072045 0.061969 [error]
Peak 0.051408 0.112692 0.152272 0.063749
0.008211 0.010212 0.010923 0.009303 [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 1.59e-07 2.82e-07 3.83e-07 1.07e-06 1.11e-06 1.90e-06 erg/cm2
Error 4.25e-08 4.36e-08 7.43e-08 4.72e-07 1.76e-07 5.20e-07 erg/cm2
Peak flux Power-law 9.67e-01 1.49e+00 1.72e+00 3.82e+00 5.31e+00 8.00e+00 ph/cm2/s
Error 1.89e-01 1.78e-01 1.49e-01 7.30e-01 4.69e-01 7.77e-01 ph/cm2/s
Fluence Cutoff-PL 1.59e-07 2.83e-07 3.83e-07 1.06e-06 1.11e-06 1.90e-06 erg/cm2
Error 4.26e-08 4.36e-08 7.44e-08 4.69e-07 1.76e-07 5.17e-07 erg/cm2
Peak flux Cutoff-PL 9.65e-01 1.49e+00 1.72e+00 3.80e+00 5.30e+00 7.98e+00 ph/cm2/s
Error 1.89e-01 1.78e-01 1.49e-01 7.26e-01 4.69e-01 7.74e-01 ph/cm2/s
Fluence Band 1.58e-07 2.81e-07 3.82e-07 1.07e-06 1.11e-06 1.89e-06 erg/cm2
Error 2.18e-08 4.07e-08 5.70e-08 4.00e-07 1.67e-07 3.22e-07 erg/cm2
Peak flux Band 8.83e-01 1.50e+00 1.80e+00 2.93e+00 5.27e+00 7.12e+00 ph/cm2/s
Error 2.47e-01 1.88e-01 2.12e-01 1.36e+00 4.74e-01 1.41e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.559 0.279 - - 1.32e-03 1.92e-04 70.343 57
CPL 1.558 0.280 9998.5 5000.0 1.32e-03 1.94e-04 70.354 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.790 0.152 - - 4.61e-02 4.18e-03 38.314 57
CPL 0.506 0.567 328.9 5000.0 6.05e-02 3.71e-02 37.647 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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 89.396 0.244 89.640
T90 85.248 0.256 85.504
T50 49.608 6.656 56.264
Peak 1.000 0.018 1.018
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
144.5214 +15.6177 0.0216 37.6 140.4 1.6743 8.9 TRIG_00243690
------------------------------------------
Foreground time interval of the image:
0.212 89.608 (delta_t = 89.396 [sec])
Background time interval of the image:
-135.659 0.212 (delta_t = 135.871 [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 0.212 sec. to 89.608 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55940 ( -0.276921 0.280118 )
Norm@50keV : 1.320203E-03 ( -1.934982E-04 1.911317E-04) )
------------------------------------------------------------
Chi-Squared = 70.34292 using 59 PHA bins.
Reduced chi-squared = 1.234086 for 57 degrees of freedom
Null hypothesis probability = 0.110
Photon flux (15-150 keV) in 89.40 sec: 0.167592 ( -0.025167 0.025255 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10956e-06 ( -1.74875e-07 1.76225e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.212 sec. to 89.608 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55763 ( -0.278845 0.281528 )
Epeak [keV] : 9998.53 ( -9998.53 1.46484 )
Norm@50keV : 1.323568E-03 ( -1.945739E-04 1.924719E-04) )
------------------------------------------------------------
Chi-Squared = 70.35446 using 59 PHA bins.
Reduced chi-squared = 1.256330 for 56 degrees of freedom
Null hypothesis probability = 9.392E-02
Photon flux (15-150 keV) in 89.40 sec: 0.167521 ( -0.025159 0.025246 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10978e-06 ( -1.75027e-07 1.76225e-07 ) ergs/cm2
Band function
Time interval is from 0.212 sec. to 89.608 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.29164 ( -8.70836 6.29164 )
beta : -1.55928 ( -0.280611 0.276729 )
Epeak [keV] : 16.5186 ( -16.4186 9983.48 )
Norm@50keV : 3.013102E-03 ( -3.013102E-03 0.268181 )
------------------------------------------------------------
Chi-Squared = 70.34298 using 59 PHA bins.
Reduced chi-squared = 1.278963 for 55 degrees of freedom
Null hypothesis probability = 7.961E-02
Photon flux (15-150 keV) in 89.40 sec: 0.166675 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.10877e-06 ( -1.57523e-07 1.75796e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.212 sec. to 0.760 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.790423 ( -0.155362 0.149635 )
Norm@50keV : 4.614661E-02 ( -4.207604E-03 4.153036E-03) )
------------------------------------------------------------
Chi-Squared = 38.31399 using 59 PHA bins.
Reduced chi-squared = 0.6721752 for 57 degrees of freedom
Null hypothesis probability = 0.973
Photon flux (15-150 keV) in 0.5480 sec: 5.30561 ( -0.46875 0.4696 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.96715e-07 ( -2.64859e-08 2.65402e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.212 sec. to 0.760 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.505907 ( -0.724325 0.408729 )
Epeak [keV] : 328.877 ( -328.867 9671.12 )
Norm@50keV : 6.052313E-02 ( -1.772897E-02 5.643574E-02) )
------------------------------------------------------------
Chi-Squared = 37.64657 using 59 PHA bins.
Reduced chi-squared = 0.6722602 for 56 degrees of freedom
Null hypothesis probability = 0.972
Photon flux (15-150 keV) in 0.5480 sec: 5.30500 ( -0.46864 0.46949 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.96095e-07 ( -2.69775e-08 2.68312e-08 ) ergs/cm2
Band function
Time interval is from 0.212 sec. to 0.760 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.848434 ( -9.15157 5.84843 )
beta : -0.790408 ( -0.149626 0.155546 )
Epeak [keV] : 12.9296 ( -12.8296 9987.07 )
Norm@50keV : 7.147227E-02 ( -2.566674E-02 81836.5 )
------------------------------------------------------------
Chi-Squared = 38.31398 using 59 PHA bins.
Reduced chi-squared = 0.6966178 for 55 degrees of freedom
Null hypothesis probability = 0.958
Photon flux (15-150 keV) in 0.5480 sec: 5.27387 ( -0.47279 0.47425 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.94745e-07 ( -2.70361e-08 2.76482e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 15:43:28 EST 2008