batgrbproduct Analysis for Trigger=115214
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 01:04:04 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger115214/GCN_download_cron
======================================================================
Trigger: 00115214 Segment: 000
BAT Trigger Time: 135849159.296 [s; MET]
Trigger Stop: 135849171.456 [s; MET]
UTC: 2005-04-22T07:52:39.807480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 324.454526255759 Dec: 55.7987882060191 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8
Image Trigger?: NO
Rate S/N Ratio: 12.2474487139159 [ if not an image trigger ]
Image S/N Ratio: 8
Flight Position: [ source = BAT ]
RA: 324.454526255759 Dec: 55.7987882060191 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 324.504667952219 Dec: 55.785175026069 [deg; J2000]
{ 21h 38m 01.1s , +55d 47' 06.6" }
+/- 1.91019968356341 [arcmin] (estimated 90% radius based on SNR)
+/- 0.87860015932668 [arcmin] (formal 1-sigma fit error)
SNR: 12.0663878774003
RA = 21h 38m 1.1s (324.504668 deg.)
Dec = 55d 47' 7" (55.785175 deg.)
Angular difference between Flight and Ground position is 1.878271 arcmin
Partial Coding Fraction: 0.9453125 [ including projection effects ]
Duration
T90: 80 +/- 22.6274169979695
Measured from: -11.2960000038147
to: 68.7039999961853 [s; relative to TRIGTIME]
T50: 48 +/- 16
Measured from: 4.7039999961853
to: 52.7039999961853 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 60.2039999961853
to: 61.2039999961853 [s; relative to TRIGTIME]
Total Fluence
Measured from: -11.2960000038147
to: 68.7039999961853 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.281215 0.325367 0.291415 0.016368
0.039296 0.040087 0.034390 0.028594 [error]
Peak 0.160948 0.115758 0.079618 -0.009753
0.017752 0.018042 0.015467 0.012710 [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 7.34e-08 1.43e-07 2.17e-07 7.12e-07 6.09e-07 1.15e-06 erg/cm2
Error 1.57e-08 1.87e-08 3.35e-08 2.41e-07 8.25e-08 2.65e-07 erg/cm2
Peak flux Power-law 8.88e-02 6.18e-02 2.82e-02 1.80e-02 1.88e-01 1.97e-01 ph/cm2/s
Error 1.85e-02 9.38e-03 8.07e-03 9.74e-03 2.78e-02 2.97e-02 ph/cm2/s
Fluence Cutoff-PL 6.50e-08 1.52e-07 2.28e-07 3.21e-07 5.87e-07 7.59e-07 erg/cm2
Error 1.95e-08 2.29e-08 3.89e-08 3.81e-07 8.87e-08 3.91e-07 erg/cm2
Peak flux Cutoff-PL 8.62e-02 6.38e-02 2.84e-02 1.25e-02 1.86e-01 1.91e-01 ph/cm2/s
Error 2.06e-02 8.47e-03 8.52e-03 1.43e-02 2.75e-02 3.25e-02 ph/cm2/s
Fluence Band 6.46e-08 1.51e-07 2.28e-07 3.21e-07 5.87e-07 7.74e-07 erg/cm2
Error 1.93e-08 2.28e-08 3.88e-08 3.74e-07 8.86e-08 3.91e-07 erg/cm2
Peak flux Band 8.62e-02 6.38e-02 2.84e-02 1.26e-02 1.86e-01 1.91e-01 ph/cm2/s
Error 2.06e-02 1.15e-02 8.53e-03 1.41e-02 2.82e-02 3.25e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.402 0.212 - - 7.88e-04 9.62e-05 57.084 57
CPL 0.781 0.914 102.7 4969.1 1.58e-03 2.49e-03 55.592 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.130 0.313 - - 1.17e-03 2.51e-04 74.567 57
CPL 1.855 0.632 23.1 5000.0 1.68e-03 3.00e-03 74.317 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: 75.584000 sec.
T50 in the 50-300 keV band: 50.048000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 80.000 -11.296 68.704
T90 80.000 -11.296 68.704
T50 48.000 4.704 52.704
Peak 1.000 60.204 61.204
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
324.5047 +55.7852 0.0160 19.2 -35.1 0.8362 12.1 TRIG_00115214
------------------------------------------
Foreground time interval of the image:
-11.296 56.605 (delta_t = 67.901 [sec])
Background time interval of the image:
-299.296 -11.296 (delta_t = 288.000 [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 -11.296 sec. to 68.704 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40196 ( -0.211944 0.212301 )
Norm@50keV : 7.876168E-04 ( -9.634177E-05 9.598146E-05) )
------------------------------------------------------------
Chi-Squared = 57.08447 using 59 PHA bins.
Reduced chi-squared = 1.001482 for 57 degrees of freedom
Null hypothesis probability = 0.472
Photon flux (15-150 keV) in 80.00 sec: 9.596001E-02 ( -0.0118879 0.011913 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.08516e-07 ( -8.19576e-08 8.29528e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.296 sec. to 68.704 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.780632 ( -1.06669 0.760762 )
Epeak [keV] : 102.671 ( -40.8763 9897.33 )
Norm@50keV : 1.581820E-03 ( -1.581820E-03 3.396308E-03) )
------------------------------------------------------------
Chi-Squared = 55.59192 using 59 PHA bins.
but latest trial 49.9577 gives Chi-Squared = 12.9642
Reduced chi-squared = 0.9927128 for 56 degrees of freedom
Null hypothesis probability = 0.490
Photon flux (15-150 keV) in 80.00 sec: 9.356183E-02 ( -0.00627092 0.0124002 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.87387e-07 ( -8.8644e-08 8.8784e-08 ) ergs/cm2
Band function
Time interval is from -11.296 sec. to 68.704 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.828645 ( -0.713587 1.11654 )
beta : -9.30400 ( -0.696002 8.04374 )
Epeak [keV] : 107.007 ( -40.8094 9892.99 )
Norm@50keV : 1.499201E-03 ( -1.499201E-03 3.489761E-03) )
------------------------------------------------------------
Chi-Squared = 55.59938 using 59 PHA bins.
Reduced chi-squared = 1.010898 for 55 degrees of freedom
Null hypothesis probability = 0.452
Photon flux (15-150 keV) in 80.00 sec: 9.357373E-02 ( -0.0125016 0.0123993 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.86968e-07 ( -8.85344e-08 8.87136e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 52.704 sec. to 68.704 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.12983 ( -0.294188 0.331342 )
Norm@50keV : 1.174193E-03 ( -2.564739E-04 2.450062E-04) )
------------------------------------------------------------
Chi-Squared = 74.56655 using 59 PHA bins.
Reduced chi-squared = 1.308185 for 57 degrees of freedom
Null hypothesis probability = 5.910E-02
Photon flux (15-150 keV) in 16.00 sec: 0.187502 ( -0.027804 0.027804 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.75058e-07 ( -3.26514e-08 3.39072e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 52.704 sec. to 68.704 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.85540 ( -1.09806 0.166531 )
Epeak [keV] : 23.0561 ( -23.0461 9976.94 )
Norm@50keV : 1.678338E-03 ( -8.276373E-04 5.181023E-03) )
------------------------------------------------------------
Chi-Squared = 74.31663 using 59 PHA bins.
but latest trial 1.97123 gives Chi-Squared = 4.267883E-02
but latest trial 8.506973E-04 gives Chi-Squared = 7.08129
Reduced chi-squared = 1.327083 for 56 degrees of freedom
Null hypothesis probability = 5.124E-02
Photon flux (15-150 keV) in 16.00 sec: 0.185919 ( -0.02754 0.027538 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.71877e-07 ( -3.37982e-08 1.77888e-08 ) ergs/cm2
Band function
Time interval is from 52.704 sec. to 68.704 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.63929 ( -3.62072 0.627313 )
beta : -9.09013 ( -0.909872 7.15770 )
Epeak [keV] : 32.1239 ( -32.0239 9967.88 )
Norm@50keV : 2.214070E-03 ( -2.214070E-03 4.919106E-03) )
------------------------------------------------------------
Chi-Squared = 74.44963 using 59 PHA bins.
Reduced chi-squared = 1.353630 for 55 degrees of freedom
Null hypothesis probability = 4.145E-02
Photon flux (15-150 keV) in 16.00 sec: 0.185926 ( -0.028213 0.028248 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.71614e-07 ( -3.38475e-08 3.54176e-08 ) ergs/cm2
Plot creation:
Sat Jan 5 01:15:54 EST 2008