batgrbproduct Analysis for Trigger=145994
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): Mon Jan 7 15:35:08 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger145994/SDC
======================================================================
Trigger: 00145994 Segment: 000
BAT Trigger Time: 143073632 [s; MET]
Trigger Stop: 143073696 [s; MET]
UTC: 2005-07-14T22:40:32.377900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 169.69397915696 Dec: -15.5277825312379 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.07
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.07
Flight Position: [ source = BAT ]
RA: 169.69397915696 Dec: -15.5277825312379 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 169.684864522723 Dec: -15.5439908713117 [deg; J2000]
{ 11h 18m 44.4s , -15d 32' 38.4" }
+/- 2.4543034427536 [arcmin] (estimated 90% radius based on SNR)
+/- 1.24117663132759 [arcmin] (formal 1-sigma fit error)
SNR: 8.43486261768477
RA = 11h 18m 44.4s (169.684865 deg.)
Dec = -15d 32' 38" (-15.543991 deg.)
Angular difference between Flight and Ground position is 1.106064 arcmin
Partial Coding Fraction: 0.3945312 [ including projection effects ]
Duration
T90: 39.7040000259876 +/- 12.6485295528462
Measured from: 27.7919999957085
to: 67.4960000216961 [s; relative to TRIGTIME]
T50: 23.2719999849796 +/- 7.74642034767598
Measured from: 31.4600000083447
to: 54.7319999933243 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 55.1680000126362
to: 56.1680000126362 [s; relative to TRIGTIME]
Total Fluence
Measured from: 17.9880000054836
to: 68.2479999959469 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.462281 0.475288 0.120546 0.061782
0.057154 0.058457 0.051595 0.046028 [error]
Peak 0.018708 0.026252 0.014568 0.004517
0.007847 0.008361 0.007308 0.006385 [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 1.89e-07 1.96e-07 1.44e-07 1.70e-07 5.95e-07 6.99e-07 erg/cm2
Error 3.46e-08 3.15e-08 4.38e-08 9.65e-08 1.05e-07 1.61e-07 erg/cm2
Peak flux Power-law 2.40e-01 1.73e-01 8.22e-02 5.52e-02 5.21e-01 5.50e-01 ph/cm2/s
Error 1.40e-01 7.45e-02 5.71e-02 8.19e-02 2.24e-01 2.37e-01 ph/cm2/s
Fluence Cutoff-PL 1.75e-07 2.34e-07 1.13e-07 1.45e-08 5.35e-07 5.37e-07 erg/cm2
Error 3.90e-08 4.44e-08 5.70e-08 4.95e-08 1.02e-07 1.13e-07 erg/cm2
Peak flux Cutoff-PL 2.33e-01 1.83e-01 8.16e-02 3.01e-02 5.17e-01 5.29e-01 ph/cm2/s
Error 1.47e-01 1.01e-01 7.35e-02 8.03e-02 1.68e-01 2.41e-01 ph/cm2/s
Fluence Band 1.72e-07 2.34e-07 1.12e-07 1.38e-08 5.33e-07 5.22e-07 erg/cm2
Error 2.59e-08 2.74e-08 4.28e-08 8.76e-09 8.12e-08 0.00e+00 erg/cm2
Peak flux Band 2.34e-01 1.83e-01 8.16e-02 3.00e-02 5.17e-01 5.28e-01 ph/cm2/s
Error 1.47e-01 9.72e-02 7.39e-02 8.03e-02 2.23e-01 2.43e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.448 0.297 - - 1.20e-03 2.70e-04 45.255 57
CPL 0.776 1.522 26.7 17.7 1.33e-02 1.02e-01 40.691 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.071 0.860 - - 3.36e-03 1.85e-03 64.017 57
CPL 1.644 2.805 33.7 5000.0 6.04e-03 4.00e+00 63.931 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 50.260 17.988 68.248
T90 39.704 27.792 67.496
T50 23.272 31.460 54.732
Peak 1.000 55.168 56.168
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
169.6849 -15.5440 0.0228 46.4 -171.5 1.0009 8.4 TRIG_00145994
------------------------------------------
Foreground time interval of the image:
17.988 68.248 (delta_t = 50.260 [sec])
Background time interval of the image:
-155.595 -83.000 (delta_t = 72.596 [sec])
-82.000 17.988 (delta_t = 99.988 [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 17.988 sec. to 68.248 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.44818 ( -0.280256 0.313353 )
Norm@50keV : 1.200514E-03 ( -2.721094E-04 2.685450E-04) )
------------------------------------------------------------
Chi-Squared = 45.25478 using 59 PHA bins.
Reduced chi-squared = 0.7939435 for 57 degrees of freedom
Null hypothesis probability = 0.869
Photon flux (15-150 keV) in 50.26 sec: 0.228548 ( -0.033526 0.033529 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.95345e-07 ( -1.03448e-07 1.07074e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 17.988 sec. to 68.248 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.775846 ( -1.83141 1.21180 )
Epeak [keV] : 26.7113 ( -26.7013 8.74551 )
Norm@50keV : 1.332600E-02 ( -1.332600E-02 0.189680 )
------------------------------------------------------------
Chi-Squared = 40.69149 using 59 PHA bins.
but latest trial 1.78581 gives Chi-Squared = 1.37115
Reduced chi-squared = 0.7266338 for 56 degrees of freedom
Null hypothesis probability = 0.938
Photon flux (15-150 keV) in 50.26 sec: 0.220936 ( -0.033643 0.033808 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.35168e-07 ( -9.58011e-08 1.08491e-07 ) ergs/cm2
Band function
Time interval is from 17.988 sec. to 68.248 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.45457 ( -1.20282 1.28089 )
beta : -9.06278 ( -5.722046E-06 0.791663 )
Epeak [keV] : 20.4351 ( -25.3256 8.38863 )
Norm@50keV : 5.002762E-03 ( -1.149850E-02 0.184533 )
------------------------------------------------------------
Chi-Squared = 41.28664 using 59 PHA bins.
Reduced chi-squared = 0.7506663 for 55 degrees of freedom
Null hypothesis probability = 0.915
Photon flux (15-150 keV) in 50.26 sec: 0.217293 ( -0.032173 0.03159 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.33133e-07 ( -8.46534e-08 7.78125e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 55.168 sec. to 56.168 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.07120 ( -0.760334 0.959175 )
Norm@50keV : 3.361048E-03 ( -1.914426E-03 1.784122E-03) )
------------------------------------------------------------
Chi-Squared = 64.01706 using 59 PHA bins.
Reduced chi-squared = 1.123106 for 57 degrees of freedom
Null hypothesis probability = 0.244
Photon flux (15-150 keV) in 1.000 sec: 0.521401 ( -0.223602 0.223731 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.1125e-08 ( -1.51655e-08 1.63375e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 55.168 sec. to 56.168 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64369 ( -4.64369 0.966264 )
Epeak [keV] : 33.7483 ( -33.7383 9966.25 )
Norm@50keV : 6.039215E-03 ( -6.039215E-03 7.99753 )
------------------------------------------------------------
Chi-Squared = 63.93146 using 59 PHA bins.
Reduced chi-squared = 1.141633 for 56 degrees of freedom
Null hypothesis probability = 0.218
Photon flux (15-150 keV) in 1.000 sec: 0.517412 ( -0.112465 0.223744 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.99268e-08 ( -2.99268e-08 1.7664e-08 ) ergs/cm2
Band function
Time interval is from 55.168 sec. to 56.168 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.66474 ( -11.5803 3.41972 )
beta : -9.31801 ( -7.33224 1.22262 )
Epeak [keV] : 33.3411 ( -30.9237 396.857 )
Norm@50keV : 5.891042E-03 ( -0.867787 260.050 )
------------------------------------------------------------
Chi-Squared = 63.93128 using 59 PHA bins.
Reduced chi-squared = 1.162387 for 55 degrees of freedom
Null hypothesis probability = 0.192
Photon flux (15-150 keV) in 1.000 sec: 0.517371 ( -0.222086 0.224724 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.93618e-08 ( -1.51402e-08 1.27932e-08 ) ergs/cm2
Plot creation:
Mon Jan 7 15:51:27 EST 2008