batgrbproduct Analysis for Trigger=147478
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 18:12:27 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger147478/SDC
======================================================================
Trigger: 00147478 Segment: 000
BAT Trigger Time: 143901249 [s; MET]
Trigger Stop: 143901249.064 [s; MET]
UTC: 2005-07-24T12:34:09.361840 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 246.214226784009 Dec: -27.5239717279159 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.77
Image Trigger?: NO
Rate S/N Ratio: 32.832910318764 [ if not an image trigger ]
Image S/N Ratio: 10.77
Flight Position: [ source = BAT ]
RA: 246.214226784009 Dec: -27.5239717279159 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 246.186555580209 Dec: -27.526782977156 [deg; J2000]
{ 16h 24m 44.8s , -27d 31' 36.4" }
+/- 2.1462081634422 [arcmin] (estimated 90% radius based on SNR)
+/- 1.09591584178138 [arcmin] (formal 1-sigma fit error)
SNR: 10.2164840710076
RA = 16h 24m 44.8s (246.186556 deg.)
Dec = -27d 31' 36" (-27.526783 deg.)
Angular difference between Flight and Ground position is 1.481970 arcmin
Partial Coding Fraction: 0.3671875 [ including projection effects ]
Duration
T90: 95.9640000164509 +/- 8.12466563776041
Measured from: 0.0519999861717224
to: 96.0160000026226 [s; relative to TRIGTIME]
T50: 61.727999985218 +/- 10.8440542184343
Measured from: 1.81600001454353
to: 63.5439999997616 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0239999890327454
to: 0.976000010967255 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0239999890327454
to: 102.831999987364 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.675029 0.699374 0.350229 0.129669
0.071491 0.061006 0.052193 0.046309 [error]
Peak 0.120807 0.133943 0.100017 0.023702
0.011608 0.010727 0.009607 0.007361 [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 2.18e-07 3.07e-07 3.21e-07 6.19e-07 1.04e-06 1.46e-06 erg/cm2
Error 3.84e-08 3.22e-08 5.47e-08 2.25e-07 1.22e-07 2.71e-07 erg/cm2
Peak flux Power-law 1.19e+00 1.09e+00 6.96e-01 6.80e-01 3.26e+00 3.66e+00 ph/cm2/s
Error 1.90e-01 1.04e-01 8.26e-02 1.69e-01 3.01e-01 3.21e-01 ph/cm2/s
Fluence Cutoff-PL 2.17e-07 3.07e-07 3.21e-07 6.14e-07 1.04e-06 1.46e-06 erg/cm2
Error 3.84e-08 3.22e-08 5.48e-08 2.23e-07 1.22e-07 2.69e-07 erg/cm2
Peak flux Cutoff-PL 1.19e+00 1.09e+00 6.96e-01 6.76e-01 3.26e+00 3.65e+00 ph/cm2/s
Error 1.90e-01 1.04e-01 8.27e-02 1.68e-01 3.01e-01 3.21e-01 ph/cm2/s
Fluence Band 2.11e-07 3.05e-07 3.24e-07 6.33e-07 1.04e-06 1.51e-06 erg/cm2
Error 3.17e-08 3.19e-08 3.85e-08 3.26e-07 1.14e-07 0.00e+00 erg/cm2
Peak flux Band 1.18e+00 1.10e+00 6.99e-01 6.40e-01 3.25e+00 3.61e+00 ph/cm2/s
Error 1.96e-01 1.12e-01 8.86e-02 2.61e-01 3.11e-01 4.13e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.934 0.216 - - 1.10e-03 1.32e-04 58.227 57
CPL 1.934 0.217 9991.2 9.7 1.10e-03 1.33e-04 58.228 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.652 0.167 - - 2.50e-02 2.29e-03 66.052 57
CPL 1.650 0.168 9994.5 5000.0 2.50e-02 2.30e-03 66.052 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: 0.320000 sec.
T50 in the 50-300 keV band: 0.128000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 102.856 -0.024 102.832
T90 95.964 0.052 96.016
T50 61.728 1.816 63.544
Peak 1.000 -0.024 0.976
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
246.1866 -27.5268 0.0188 33.3 45.6 0.6353 10.2 TRIG_00147478
------------------------------------------
Foreground time interval of the image:
0.016 12.445 (delta_t = 12.429 [sec])
Background time interval of the image:
-183.155 0.016 (delta_t = 183.171 [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 0.016 sec. to 102.872 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.93413 ( -0.211933 0.220235 )
Norm@50keV : 1.098950E-03 ( -1.340928E-04 1.305307E-04) )
------------------------------------------------------------
Chi-Squared = 58.22683 using 59 PHA bins.
Reduced chi-squared = 1.021523 for 57 degrees of freedom
Null hypothesis probability = 0.430
Photon flux (15-150 keV) in 102.9 sec: 0.160046 ( -0.017433 0.017536 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04026e-06 ( -1.21605e-07 1.23182e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.016 sec. to 102.872 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.93393 ( -0.212915 0.221284 )
Epeak [keV] : 9991.18 ( -10.6357 8.82227 )
Norm@50keV : 1.098825E-03 ( -1.342854E-04 1.318221E-04) )
------------------------------------------------------------
Chi-Squared = 58.22827 using 59 PHA bins.
Reduced chi-squared = 1.039791 for 56 degrees of freedom
Null hypothesis probability = 0.393
Photon flux (15-150 keV) in 102.9 sec: 0.159972 ( -0.017425 0.017529 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04011e-06 ( -1.21528e-07 1.23295e-07 ) ergs/cm2
Band function
Time interval is from 0.016 sec. to 102.872 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.50253 ( -8.49747 6.50253 )
beta : -1.93163 ( -0.220055 0.209574 )
Epeak [keV] : 15.6073 ( -15.5073 161.419 )
Norm@50keV : 2.966224E-03 ( -2.966224E-03 10.5809 )
------------------------------------------------------------
Chi-Squared = 58.22797 using 59 PHA bins.
Reduced chi-squared = 1.058690 for 55 degrees of freedom
Null hypothesis probability = 0.357
Photon flux (15-150 keV) in 102.9 sec: 0.159748 ( -0.016599 0.016698 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04264e-06 ( -1.09174e-07 1.18695e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.016 sec. to 1.016 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65181 ( -0.165721 0.168927 )
Norm@50keV : 2.495920E-02 ( -2.298841E-03 2.279729E-03) )
------------------------------------------------------------
Chi-Squared = 66.05230 using 59 PHA bins.
Reduced chi-squared = 1.158812 for 57 degrees of freedom
Null hypothesis probability = 0.193
Photon flux (15-150 keV) in 1.000 sec: 3.26102 ( -0.30054 0.30198 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.32093e-07 ( -2.2601e-08 2.2758e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.016 sec. to 1.016 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65000 ( -0.166723 0.169846 )
Epeak [keV] : 9994.50 ( -9994.49 5.50293 )
Norm@50keV : 2.501241E-02 ( -2.311639E-03 2.291331E-03) )
------------------------------------------------------------
Chi-Squared = 66.05166 using 59 PHA bins.
Reduced chi-squared = 1.179494 for 56 degrees of freedom
Null hypothesis probability = 0.168
Photon flux (15-150 keV) in 1.000 sec: 3.25966 ( -0.30041 0.30186 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3115e-07 ( -2.3631e-08 2.3868e-08 ) ergs/cm2
Band function
Time interval is from 0.016 sec. to 1.016 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.41052 ( -8.58948 6.40999 )
beta : -1.65181 ( -0.168485 0.165708 )
Epeak [keV] : 24.5994 ( -24.4994 9975.40 )
Norm@50keV : 4.677083E-02 ( -2.454969E-02 391.509 )
------------------------------------------------------------
Chi-Squared = 66.05231 using 59 PHA bins.
Reduced chi-squared = 1.200951 for 55 degrees of freedom
Null hypothesis probability = 0.146
Photon flux (15-150 keV) in 1.000 sec: 3.25134 ( -0.31207 0.30989 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31736e-07 ( -2.4315e-08 2.2893e-08 ) ergs/cm2
Plot creation:
Mon Jan 7 18:26:47 EST 2008