batgrbproduct Analysis for Trigger=114753
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 00:06:12 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger114753/SDC
======================================================================
Trigger: 00114753 Segment: 000
BAT Trigger Time: 135342283.968 [s; MET]
Trigger Stop: 135342284.48 [s; MET]
UTC: 2005-04-16T11:04:44.488360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 188.478556551299 Dec: 21.0434055593792 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11
Image Trigger?: NO
Rate S/N Ratio: 19.2613602842582 [ if not an image trigger ]
Image S/N Ratio: 11
Flight Position: [ source = BAT ]
RA: 188.478556551299 Dec: 21.0434055593792 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 188.482249533018 Dec: 21.0599609719841 [deg; J2000]
{ 12h 33m 55.7s , +21d 03' 35.9" }
+/- 1.51843924966585 [arcmin] (estimated 90% radius based on SNR)
+/- 0.623671428618201 [arcmin] (formal 1-sigma fit error)
SNR: 16.7486268516692
RA = 12h 33m 55.7s (188.482250 deg.)
Dec = 21d 3' 36" (21.059961 deg.)
Angular difference between Flight and Ground position is 1.014621 arcmin
Partial Coding Fraction: 0.1679688 [ including projection effects ]
Duration
T90: 2.48800000548363 +/- 0.444072089685655
Measured from: 0.0559999942779541
to: 2.54399999976158 [s; relative to TRIGTIME]
T50: 0.903999984264374 +/- 0.545321930461323
Measured from: 0.464000016450882
to: 1.36800000071526 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0559999942779541
to: 0.944000005722046 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0559999942779541
to: 2.96400001645088 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.447358 0.302954 0.044328 -0.011623
0.026321 0.024438 0.018316 0.015300 [error]
Peak 0.257710 0.211233 0.025692 -0.001589
0.017325 0.016446 0.011262 0.008896 [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 1.70e-07 1.22e-07 5.77e-08 3.85e-08 3.68e-07 3.88e-07 erg/cm2
Error 1.93e-08 1.37e-08 1.35e-08 1.63e-08 3.74e-08 4.37e-08 erg/cm2
Peak flux Power-law 2.97e+00 1.41e+00 4.09e-01 1.49e-01 4.88e+00 4.94e+00 ph/cm2/s
Error 3.52e-01 1.48e-01 7.77e-02 4.89e-02 4.82e-01 4.86e-01 ph/cm2/s
Fluence Cutoff-PL 1.62e-07 1.37e-07 3.34e-08 1.60e-09 3.34e-07 3.33e-07 erg/cm2
Error 2.11e-08 1.74e-08 1.90e-08 5.94e-09 3.75e-08 3.81e-08 erg/cm2
Peak flux Cutoff-PL 2.77e+00 1.85e+00 1.84e-01 1.06e-03 4.80e+00 4.80e+00 ph/cm2/s
Error 4.03e-01 2.19e-01 1.06e-01 4.60e-03 4.86e-01 4.86e-01 ph/cm2/s
Fluence Band 1.70e-07 1.20e-07 5.57e-08 3.61e-08 3.65e-07 3.83e-07 erg/cm2
Error 1.87e-08 1.27e-08 1.29e-08 7.65e-09 3.56e-08 4.07e-08 erg/cm2
Peak flux Band 3.05e+00 1.45e+00 2.61e-01 4.38e-02 4.88e+00 4.94e+00 ph/cm2/s
Error 3.29e-01 9.34e-02 3.11e-02 4.88e-01 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.078 0.221 - - 9.76e-03 1.71e-03 58.790 57
CPL 1.233 1.201 13.0 10.3 1.72e-01 1.20e+00 51.223 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.790 0.182 - - 2.06e-02 3.08e-03 78.872 57
CPL -0.513 1.710 24.1 4.1 3.48e+00 0.00e+00 55.278 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 3.020 -0.056 2.964
T90 2.488 0.056 2.544
T50 0.904 0.464 1.368
Peak 1.000 -0.056 0.944
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
188.4822 +21.0600 0.0115 36.3 79.1 0.8102 16.7 TRIG_00114753
------------------------------------------
Foreground time interval of the image:
-0.056 2.964 (delta_t = 3.020 [sec])
Background time interval of the image:
-299.968 -0.056 (delta_t = 299.912 [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 -0.056 sec. to 2.964 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.07762 ( -0.213364 0.229475 )
Norm@50keV : 9.760588E-03 ( -1.687458E-03 1.724413E-03) )
------------------------------------------------------------
Chi-Squared = 58.78954 using 59 PHA bins.
Reduced chi-squared = 1.031395 for 57 degrees of freedom
Null hypothesis probability = 0.410
Photon flux (15-150 keV) in 3.020 sec: 2.84170 ( -0.26764 0.26792 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.67546e-07 ( -3.72849e-08 3.75295e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.056 sec. to 2.964 sec.
Parameters : value lower 90% higher 90%
Photon index: 1.23289 ( -1.64987 0.752769 )
Epeak [keV] : 13.0226 ( -12.0913 8.50648 )
Norm@50keV : 0.171932 ( -0.127570 2.26390 )
------------------------------------------------------------
Chi-Squared = 51.22294 using 59 PHA bins.
but latest trial 0.890602 gives Chi-Squared = 0.840691
but latest trial 4.422683E-02 gives Chi-Squared = 2.84150
Reduced chi-squared = 0.9146954 for 56 degrees of freedom
Null hypothesis probability = 0.656
Photon flux (15-150 keV) in 3.020 sec: 2.84047 ( -0.26751 0.26779 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.33819e-07 ( -3.60389e-08 3.89701e-08 ) ergs/cm2
Band function
Time interval is from -0.056 sec. to 2.964 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.55777 ( -0.151320 8.836055E-02) )
beta : -9.26264 ( -0.737358 19.2625 )
Epeak [keV] : 8.46378 ( -4.96115 8.53463 )
Norm@50keV : 0.115152 ( -1.609497E-02 440.868 )
------------------------------------------------------------
Chi-Squared = 51.80974 using 59 PHA bins.
Reduced chi-squared = 0.9419953 for 55 degrees of freedom
Null hypothesis probability = 0.597
Photon flux (15-150 keV) in 3.020 sec: 2.70240 ( -0.26223 0.24897 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.64734e-07 ( -3.39206e-08 3.72034e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.056 sec. to 0.944 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.79035 ( -0.176603 0.188003 )
Norm@50keV : 2.057991E-02 ( -3.072515E-03 3.078219E-03) )
------------------------------------------------------------
Chi-Squared = 78.87161 using 59 PHA bins.
Reduced chi-squared = 1.383713 for 57 degrees of freedom
Null hypothesis probability = 2.914E-02
Photon flux (15-150 keV) in 1.000 sec: 4.88101 ( -0.48192 0.48212 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.26349e-07 ( -2.4171e-08 2.4359e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.056 sec. to 0.944 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.513222 ( -2.11031 1.30899 )
Epeak [keV] : 24.0536 ( -4.87777 3.30069 )
Norm@50keV : 3.47505 ( )
------------------------------------------------------------
Chi-Squared = 55.27775 using 59 PHA bins.
Reduced chi-squared = 0.9871027 for 56 degrees of freedom
Null hypothesis probability = 0.502
Photon flux (15-150 keV) in 1.000 sec: 4.80002 ( -0.48637 0.48569 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.01757e-07 ( -2.1138e-08 2.209e-08 ) ergs/cm2
Band function
Time interval is from -0.056 sec. to 0.944 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.44312 ( -0.147636 0.414863 )
beta : -8.73850 ( -0.628562 19.3714 )
Epeak [keV] : 15.8726 ( -4.99000 2.39996 )
Norm@50keV : 0.139348 ( -7.06689 3125.12 )
------------------------------------------------------------
Chi-Squared = 63.41484 using 59 PHA bins.
Reduced chi-squared = 1.152997 for 55 degrees of freedom
Null hypothesis probability = 0.204
Photon flux (15-150 keV) in 1.000 sec: 4.87951 ( -0.46042 0.51551 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.1463e-07 ( -2.0525e-08 2.5067e-08 ) ergs/cm2
Plot creation:
Sat Jan 5 00:22:10 EST 2008