batgrbproduct Analysis for Trigger=148225
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): Tue Jan 8 14:13:30 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger148225/GCN5_download_hand
======================================================================
Trigger: 00148225 Segment: 000
BAT Trigger Time: 144446302.848 [s; MET]
Trigger Stop: 144446315.008 [s; MET]
UTC: 2005-07-30T19:58:23.199020 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 212.065218990972 Dec: -3.76180048165143 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.96
Image Trigger?: NO
Rate S/N Ratio: 11.9582607431014 [ if not an image trigger ]
Image S/N Ratio: 10.96
Flight Position: [ source = BAT ]
RA: 212.065218990972 Dec: -3.76180048165143 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 212.070239396566 Dec: -3.75447951543452 [deg; J2000]
{ 14h 08m 16.9s , -03d 45' 16.1" }
+/- 1.37918997454049 [arcmin] (estimated 90% radius based on SNR)
+/- 0.535507316640729 [arcmin] (formal 1-sigma fit error)
SNR: 19.2156638172196
RA = 14h 8m 16.9s (212.070239 deg.)
Dec = -3d 45' 16" (-3.754480 deg.)
Angular difference between Flight and Ground position is 0.532254 arcmin
Partial Coding Fraction: 0.78125 [ including projection effects ]
Duration
T90: 156.504000008106 +/- 18.0332990692667
Measured from: -46.9280000030994
to: 109.576000005007 [s; relative to TRIGTIME]
T50: 62.0999999940395 +/- 11.9340058671203
Measured from: -9.02399998903275
to: 53.0760000050068 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.02799999713898
to: 6.02799999713898 [s; relative to TRIGTIME]
Total Fluence
Measured from: -59.7599999904633
to: 120.516000002623 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.113127 1.355605 1.092984 0.309825
0.070426 0.071648 0.064026 0.058301 [error]
Peak 0.017959 0.022484 0.022418 0.010819
0.005646 0.005701 0.005299 0.004659 [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 3.37e-07 6.03e-07 8.29e-07 2.36e-06 2.39e-06 4.14e-06 erg/cm2
Error 3.75e-08 3.84e-08 6.41e-08 4.15e-07 1.52e-07 4.54e-07 erg/cm2
Peak flux Power-law 1.52e-01 1.75e-01 1.46e-01 2.05e-01 5.47e-01 6.78e-01 ph/cm2/s
Error 7.50e-02 5.19e-02 4.24e-02 1.34e-01 1.40e-01 1.73e-01 ph/cm2/s
Fluence Cutoff-PL 3.37e-07 6.04e-07 8.29e-07 2.34e-06 2.39e-06 4.12e-06 erg/cm2
Error 3.75e-08 3.84e-08 6.42e-08 4.11e-07 1.52e-07 5.59e-07 erg/cm2
Peak flux Cutoff-PL 1.51e-01 1.76e-01 1.46e-01 2.03e-01 5.47e-01 6.76e-01 ph/cm2/s
Error 7.50e-02 5.20e-02 4.24e-02 1.34e-01 1.40e-01 1.73e-01 ph/cm2/s
Fluence Band 3.26e-07 5.97e-07 8.33e-07 2.41e-06 2.40e-06 3.46e-06 erg/cm2
Error 2.25e-08 4.82e-08 2.86e-07 1.39e-07 8.70e-07 0.00e+00 erg/cm2
Peak flux Band 1.53e-01 1.76e-01 1.47e-01 2.06e-01 5.46e-01 6.77e-01 ph/cm2/s
Error 5.78e-02 4.98e-02 3.82e-02 1.38e-01 1.36e-01 1.66e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.542 0.113 - - 1.41e-03 8.27e-05 41.317 57
CPL 1.524 0.210 9427.7 0.0 1.40e-03 8.31e-05 41.460 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.265 0.474 - - 4.61e-03 1.13e-03 31.940 57
CPL 1.261 0.478 9993.1 5000.0 4.63e-03 1.13e-03 31.945 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: 156.608000 sec.
T50 in the 50-300 keV band: 56.576000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 180.276 -59.760 120.516
T90 156.504 -46.928 109.576
T50 62.100 -9.024 53.076
Peak 1.000 5.028 6.028
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
212.0702 -3.7545 0.0100 30.5 -2.4 2.7095 19.2 TRIG_00148225
------------------------------------------
Foreground time interval of the image:
-59.760 56.253 (delta_t = 116.013 [sec])
Background time interval of the image:
-254.647 -59.760 (delta_t = 194.887 [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 -59.760 sec. to 120.516 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54224 ( -0.112477 0.112954 )
Norm@50keV : 1.406906E-03 ( -8.283614E-05 8.250365E-05) )
------------------------------------------------------------
Chi-Squared = 41.31736 using 59 PHA bins.
Reduced chi-squared = 0.7248660 for 57 degrees of freedom
Null hypothesis probability = 0.941
Photon flux (15-150 keV) in 180.3 sec: 0.177709 ( -0.010942 0.011011 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.39058e-06 ( -1.51831e-07 1.5284e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -59.760 sec. to 120.516 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52400 ( -0.287987 0.132315 )
Epeak [keV] : 9427.74 ( )
Norm@50keV : 1.399261E-03 ( -8.415768E-05 8.195033E-05) )
------------------------------------------------------------
Chi-Squared = 41.45984 using 59 PHA bins.
Reduced chi-squared = 0.7403544 for 56 degrees of freedom
Null hypothesis probability = 0.927
Photon flux (15-150 keV) in 180.3 sec: 0.177629 ( -0.010937 0.011006 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.39092e-06 ( -1.51921e-07 1.52858e-07 ) ergs/cm2
Band function
Time interval is from -59.760 sec. to 120.516 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.27969 ( -8.72031 6.27969 )
beta : -1.54224 ( -0.112961 0.112470 )
Epeak [keV] : 18.2258 ( -18.1258 9966.51 )
Norm@50keV : 3.107688E-03 ( -3.107687E-03 164.560 )
------------------------------------------------------------
Chi-Squared = 41.31736 using 59 PHA bins.
Reduced chi-squared = 0.7512246 for 55 degrees of freedom
Null hypothesis probability = 0.914
Photon flux (15-150 keV) in 180.3 sec: 0.201513 ( -0.034078 0.165072 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.39568e-06 ( -1.38056e-07 1.39498e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 5.028 sec. to 6.028 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26478 ( -0.485593 0.463316 )
Norm@50keV : 4.612584E-03 ( -1.128864E-03 1.128850E-03) )
------------------------------------------------------------
Chi-Squared = 31.94020 using 59 PHA bins.
Reduced chi-squared = 0.5603544 for 57 degrees of freedom
Null hypothesis probability = 0.997
Photon flux (15-150 keV) in 1.000 sec: 0.546883 ( -0.139949 0.140635 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.59792e-08 ( -1.23967e-08 1.25675e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.028 sec. to 6.028 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26105 ( -0.489327 0.466061 )
Epeak [keV] : 9993.11 ( -9993.10 6.89355 )
Norm@50keV : 4.633009E-03 ( -1.134171E-03 1.133990E-03) )
------------------------------------------------------------
Chi-Squared = 31.94508 using 59 PHA bins.
Reduced chi-squared = 0.5704479 for 56 degrees of freedom
Null hypothesis probability = 0.996
Photon flux (15-150 keV) in 1.000 sec: 0.546698 ( -0.139905 0.140595 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.59879e-08 ( -1.24028e-08 1.25753e-08 ) ergs/cm2
Band function
Time interval is from 5.028 sec. to 6.028 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.930354 ( -9.06965 5.88976 )
beta : -1.26578 ( -8.73422 0.485243 )
Epeak [keV] : 72.4164 ( -72.3164 9927.58 )
Norm@50keV : 8.420170E-03 ( -13.2491 887.666 )
------------------------------------------------------------
Chi-Squared = 31.92963 using 59 PHA bins.
Reduced chi-squared = 0.5805387 for 55 degrees of freedom
Null hypothesis probability = 0.995
Photon flux (15-150 keV) in 1.000 sec: 0.546330 ( -0.137161 0.135575 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.61924e-08 ( -1.16042e-08 1.21629e-08 ) ergs/cm2
Plot creation:
Tue Jan 8 14:27:06 EST 2008