batgrbproduct Analysis for Trigger=117504
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): Sat Jan 5 01:29:37 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger117504/SDC
======================================================================
Trigger: 00117504 Segment: 000
BAT Trigger Time: 137028140.608 [s; MET]
Trigger Stop: 137028142.656 [s; MET]
UTC: 2005-05-05T23:22:21.098760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 141.781927347682 Dec: 30.2552283992829 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10
Image Trigger?: NO
Rate S/N Ratio: 15.4596248337403 [ if not an image trigger ]
Image S/N Ratio: 10
Flight Position: [ source = BAT ]
RA: 141.781927347682 Dec: 30.2552283992829 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 141.756938658209 Dec: 30.2672088167886 [deg; J2000]
{ 09h 27m 01.7s , +30d 16' 02.0" }
+/- 1.29304056843882 [arcmin] (estimated 90% radius based on SNR)
+/- 0.401516161635 [arcmin] (formal 1-sigma fit error)
SNR: 21.0703839839942
RA = 9h 27m 1.7s (141.756939 deg.)
Dec = 30d 16' 2" (30.267209 deg.)
Angular difference between Flight and Ground position is 1.481143 arcmin
Partial Coding Fraction: 0.2480469 [ including projection effects ]
Duration
T90: 58.8240000009537 +/- 6.83897067866905
Measured from: -8.608000010252
to: 50.2159999907017 [s; relative to TRIGTIME]
T50: 25.6680000126362 +/- 5.93981984521465
Measured from: 0.467999994754791
to: 26.136000007391 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.01999998092651
to: 2.01999998092651 [s; relative to TRIGTIME]
Total Fluence
Measured from: -10.0640000104904
to: 52.4919999837875 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.719735 1.315814 1.061908 0.325089
0.081143 0.084037 0.073364 0.060315 [error]
Peak 0.020921 0.083700 0.083552 0.028580
0.010562 0.011706 0.010603 0.008465 [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 3.04e-07 5.88e-07 8.86e-07 2.89e-06 2.49e-06 4.66e-06 erg/cm2
Error 4.18e-08 4.91e-08 7.01e-08 5.05e-07 1.79e-07 5.41e-07 erg/cm2
Peak flux Power-law 4.52e-01 5.73e-01 5.30e-01 8.60e-01 1.85e+00 2.41e+00 ph/cm2/s
Error 1.46e-01 1.17e-01 7.95e-02 2.59e-01 3.11e-01 3.57e-01 ph/cm2/s
Fluence Cutoff-PL 2.78e-07 6.10e-07 9.30e-07 1.75e-06 2.46e-06 3.48e-06 erg/cm2
Error 5.12e-08 5.66e-08 8.74e-08 1.06e-06 1.86e-07 1.04e-06 erg/cm2
Peak flux Cutoff-PL 3.62e-01 5.96e-01 5.95e-01 4.76e-01 1.81e+00 2.03e+00 ph/cm2/s
Error 1.70e-01 1.33e-01 1.11e-01 3.73e-01 3.12e-01 4.66e-01 ph/cm2/s
Fluence Band 2.47e-07 6.42e-07 8.97e-07 2.35e-06 2.44e-06 4.19e-06 erg/cm2
Error 5.96e-08 4.76e-08 7.57e-08 4.60e-07 1.83e-07 6.35e-07 erg/cm2
Peak flux Band 3.62e-01 5.96e-01 5.96e-01 4.75e-01 1.81e+00 2.03e+00 ph/cm2/s
Error 1.70e-01 1.33e-01 1.11e-01 3.73e-01 3.12e-01 4.77e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.410 0.120 - - 4.13e-03 2.90e-04 47.754 57
CPL 0.988 0.512 133.8 4956.6 6.47e-03 3.72e-03 45.649 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.112 0.246 - - 1.59e-02 2.52e-03 63.691 57
CPL 0.314 1.049 127.3 4960.7 3.52e-02 5.25e-02 61.607 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: 58.560000 sec.
T50 in the 50-300 keV band: 24.512000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 62.556 -10.064 52.492
T90 58.824 -8.608 50.216
T50 25.668 0.468 26.136
Peak 1.000 1.020 2.020
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
141.7569 +30.2672 0.0092 49.3 -157.1 3.6749 21.1 TRIG_00117504
------------------------------------------
Foreground time interval of the image:
-10.064 52.492 (delta_t = 62.556 [sec])
Background time interval of the image:
-299.608 -110.718 (delta_t = 188.890 [sec])
-109.608 -10.064 (delta_t = 99.544 [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 -10.064 sec. to 52.492 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40973 ( -0.120687 0.119098 )
Norm@50keV : 4.126661E-03 ( -2.899724E-04 2.896586E-04) )
------------------------------------------------------------
Chi-Squared = 47.75385 using 59 PHA bins.
Reduced chi-squared = 0.8377867 for 57 degrees of freedom
Null hypothesis probability = 0.804
Photon flux (15-150 keV) in 62.56 sec: 0.503670 ( -0.039208 0.039395 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.48965e-06 ( -1.7869e-07 1.79028e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -10.064 sec. to 52.492 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.988400 ( -0.548665 0.476013 )
Epeak [keV] : 133.846 ( -46.9419 9866.15 )
Norm@50keV : 6.474029E-03 ( -2.473202E-03 4.961493E-03) )
------------------------------------------------------------
Chi-Squared = 45.64883 using 59 PHA bins.
Reduced chi-squared = 0.8151578 for 56 degrees of freedom
Null hypothesis probability = 0.837
Photon flux (15-150 keV) in 62.56 sec: 0.495338 ( -0.040317 0.040573 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.45788e-06 ( -1.87323e-07 1.84708e-07 ) ergs/cm2
Band function
Time interval is from -10.064 sec. to 52.492 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.237389 ( -1.17143 3.68157 )
beta : -1.63560 ( -8.36440 0.236429 )
Epeak [keV] : 64.8810 ( -38.5165 184.899 )
Norm@50keV : 1.780005E-02 ( -1.780005E-02 45.1633 )
------------------------------------------------------------
Chi-Squared = 43.63987 using 59 PHA bins.
Reduced chi-squared = 0.7934523 for 55 degrees of freedom
Null hypothesis probability = 0.865
Photon flux (15-150 keV) in 62.56 sec: 0.487129 ( -0.04184 0.038561 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.43607e-06 ( -1.84458e-07 1.81599e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.020 sec. to 2.020 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11214 ( -0.254758 0.237149 )
Norm@50keV : 1.589853E-02 ( -2.541946E-03 2.499709E-03) )
------------------------------------------------------------
Chi-Squared = 63.69096 using 59 PHA bins.
Reduced chi-squared = 1.117385 for 57 degrees of freedom
Null hypothesis probability = 0.253
Photon flux (15-150 keV) in 1.000 sec: 1.84640 ( -0.30972 0.31327 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65587e-07 ( -2.464e-08 2.4647e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.020 sec. to 2.020 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.313993 ( -1.18788 0.910550 )
Epeak [keV] : 127.305 ( -48.6387 9872.70 )
Norm@50keV : 3.515404E-02 ( -3.515404E-02 6.993128E-02) )
------------------------------------------------------------
Chi-Squared = 61.60696 using 59 PHA bins.
but latest trial 61.3519 gives Chi-Squared = 13.4902
Reduced chi-squared = 1.100124 for 56 degrees of freedom
Null hypothesis probability = 0.282
Photon flux (15-150 keV) in 1.000 sec: 1.81259 ( -0.30953 0.31379 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.647e-07 ( -2.5047e-08 2.5142e-08 ) ergs/cm2
Band function
Time interval is from 1.020 sec. to 2.020 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.312189 ( -0.912262 1.18776 )
beta : -9.06019 ( -0.939811 8.11792 )
Epeak [keV] : 127.111 ( -44.3545 9872.89 )
Norm@50keV : 3.522222E-02 ( -3.522222E-02 6.998064E-02) )
------------------------------------------------------------
Chi-Squared = 61.60691 using 59 PHA bins.
Reduced chi-squared = 1.120126 for 55 degrees of freedom
Null hypothesis probability = 0.252
Photon flux (15-150 keV) in 1.000 sec: 1.81238 ( -0.30933 0.31471 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.64736e-07 ( -2.5146e-08 2.5043e-08 ) ergs/cm2
Plot creation:
Sat Jan 5 01:41:45 EST 2008