batgrbproduct Analysis for Trigger=131156
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): Sun Jan 6 18:37:29 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger131156/SDC
======================================================================
Trigger: 00131156 Segment: 000
BAT Trigger Time: 139292684.224 [s; MET]
Trigger Stop: 139292700.608 [s; MET]
UTC: 2005-06-01T04:24:44.673560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 298.980125258475 Dec: 34.7626416482042 [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: 7.07106781186548 [ if not an image trigger ]
Image S/N Ratio: 10
Flight Position: [ source = BAT ]
RA: 298.980125258475 Dec: 34.7626416482042 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 298.986655482089 Dec: 34.6773313658697 [deg; J2000]
{ 19h 55m 56.8s , +34d 40' 38.4" }
+/- 1.8505553724832 [arcmin] (estimated 90% radius based on SNR)
+/- 0.638844113828866 [arcmin] (formal 1-sigma fit error)
SNR: 12.6257812057439
RA = 19h 55m 56.8s (298.986655 deg.)
Dec = 34d 40' 38" (34.677331 deg.)
Angular difference between Flight and Ground position is 5.128738 arcmin
Partial Coding Fraction: 0.53125 [ including projection effects ]
Duration
T90: 18.4200000166893 +/- 5.44183059518559
Measured from: -3.20000001788139
to: 15.2199999988079 [s; relative to TRIGTIME]
T50: 3.97200000286102 +/- 6.79589080340662
Measured from: 0.719999998807907
to: 4.69200000166893 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.5959999859333
to: 2.5959999859333 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.16400000452995
to: 15.4519999921322 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.175730 0.224815 0.126396 0.025376
0.027313 0.027721 0.023865 0.020551 [error]
Peak 0.017939 0.022006 0.005884 0.012888
0.006208 0.006267 0.005320 0.004739 [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 6.70e-08 9.46e-08 9.88e-08 1.90e-07 3.20e-07 4.49e-07 erg/cm2
Error 1.41e-08 1.35e-08 2.37e-08 9.19e-08 5.45e-08 1.16e-07 erg/cm2
Peak flux Power-law 2.01e-01 1.61e-01 8.70e-02 6.86e-02 4.81e-01 5.18e-01 ph/cm2/s
Error 1.04e-01 5.24e-02 6.82e-02 9.22e-02 1.57e-01 1.72e-01 ph/cm2/s
Fluence Cutoff-PL 6.27e-08 1.02e-07 9.93e-08 7.67e-08 3.06e-07 3.46e-07 erg/cm2
Error 1.67e-08 1.91e-08 2.62e-08 1.38e-07 5.98e-08 1.52e-07 erg/cm2
Peak flux Cutoff-PL 2.01e-01 1.61e-01 8.69e-02 6.80e-02 4.80e-01 5.18e-01 ph/cm2/s
Error 1.04e-01 5.24e-02 6.82e-02 9.14e-02 1.57e-01 1.72e-01 ph/cm2/s
Fluence Band 6.24e-08 1.01e-07 9.87e-08 1.04e-07 3.07e-07 3.62e-07 erg/cm2
Error 1.56e-08 1.74e-08 2.85e-08 7.63e-08 4.61e-08 1.47e-07 erg/cm2
Peak flux Band 1.84e-01 1.60e-01 9.25e-02 7.93e-02 4.78e-01 5.27e-01 ph/cm2/s
Error 4.92e-02 5.23e-02 3.45e-02 7.36e-02 1.55e-01 1.67e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.936 0.272 - - 1.77e-03 3.09e-04 44.774 57
CPL 1.120 0.000 48.3 5000.0 4.97e-03 1.21e-02 44.117 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.889 0.750 - - 3.36e-03 1.43e-03 59.612 57
CPL 2.029 0.000 12.0 0.0 2.43e-03 2.23e-03 58.751 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 19.616 -4.164 15.452
T90 18.420 -3.200 15.220
T50 3.972 0.720 4.692
Peak 1.000 1.596 2.596
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
298.9867 +34.6773 0.0152 31.2 32.7 0.6450 12.6 TRIG_00131156
------------------------------------------
Foreground time interval of the image:
-4.164 15.452 (delta_t = 19.616 [sec])
Background time interval of the image:
-299.224 -4.164 (delta_t = 295.060 [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 -4.164 sec. to 15.452 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.93612 ( -0.261871 0.282098 )
Norm@50keV : 1.774730E-03 ( -3.149383E-04 3.039831E-04) )
------------------------------------------------------------
Chi-Squared = 44.77446 using 59 PHA bins.
Reduced chi-squared = 0.7855169 for 57 degrees of freedom
Null hypothesis probability = 0.880
Photon flux (15-150 keV) in 19.62 sec: 0.258688 ( -0.037097 0.037121 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.20318e-07 ( -5.38647e-08 5.50812e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.164 sec. to 15.452 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11957 ( )
Epeak [keV] : 48.2842 ( -49.6721 9950.32 )
Norm@50keV : 4.968246E-03 ( -3.533811E-03 2.066975E-02) )
------------------------------------------------------------
Chi-Squared = 44.11699 using 59 PHA bins.
Reduced chi-squared = 0.7878035 for 56 degrees of freedom
Null hypothesis probability = 0.875
Photon flux (15-150 keV) in 19.62 sec: 0.253030 ( -0.039066 0.038767 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.0585e-07 ( -5.81811e-08 6.14479e-08 ) ergs/cm2
Band function
Time interval is from -4.164 sec. to 15.452 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.17172 ( -8.82828 3.14570 )
beta : -3.10017 ( -6.89983 12.8558 )
Epeak [keV] : 54.3209 ( -49.2378 92.4586 )
Norm@50keV : 4.330699E-03 ( -3.803205E-03 1642.67 )
------------------------------------------------------------
Chi-Squared = 44.23827 using 59 PHA bins.
Reduced chi-squared = 0.8043321 for 55 degrees of freedom
Null hypothesis probability = 0.850
Photon flux (15-150 keV) in 19.62 sec: 0.252951 ( -0.037522 0.037094 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.06629e-07 ( -3.25084e-08 5.979e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.596 sec. to 2.596 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88855 ( -0.707487 0.793020 )
Norm@50keV : 3.363758E-03 ( -1.521707E-03 1.332987E-03) )
------------------------------------------------------------
Chi-Squared = 59.61230 using 59 PHA bins.
Reduced chi-squared = 1.045830 for 57 degrees of freedom
Null hypothesis probability = 0.381
Photon flux (15-150 keV) in 1.000 sec: 0.480525 ( -0.15703 0.15674 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.08918e-08 ( -1.23765e-08 1.31508e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.596 sec. to 2.596 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.02870 ( )
Epeak [keV] : 12.0257 ( )
Norm@50keV : 2.426378E-03 ( -2.300210E-03 2.169630E-03) )
------------------------------------------------------------
Chi-Squared = 58.75119 using 59 PHA bins.
Reduced chi-squared = 1.049128 for 56 degrees of freedom
Null hypothesis probability = 0.375
Photon flux (15-150 keV) in 1.000 sec: 0.480316 ( -0.15699 0.156696 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.08986e-08 ( -1.23995e-08 1.31293e-08 ) ergs/cm2
Band function
Time interval is from 1.596 sec. to 2.596 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.47103 ( -8.52897 6.47103 )
beta : -1.88599 ( -1.20987 0.705770 )
Epeak [keV] : 13.1442 ( -13.0442 9986.86 )
Norm@50keV : 9.826742E-03 ( -9.826742E-03 299.537 )
------------------------------------------------------------
Chi-Squared = 59.61236 using 59 PHA bins.
Reduced chi-squared = 1.083861 for 55 degrees of freedom
Null hypothesis probability = 0.312
Photon flux (15-150 keV) in 1.000 sec: 0.477749 ( -0.15534 0.15548 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.10656e-08 ( -1.00979e-08 1.25942e-08 ) ergs/cm2
Plot creation:
Sun Jan 6 18:47:53 EST 2008