batgrbproduct Analysis for Trigger=257213
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): Thu Dec 13 11:49:51 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger257213/GCN5_download_cron
======================================================================
Trigger: 00257213 Segment: 000
BAT Trigger Time: 191139180.16 [s; MET]
Trigger Stop: 191139188.352 [s; MET]
UTC: 2007-01-22T06:12:58.445300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 266.265032609865 Dec: -28.9518822403057 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 9.22
Image Trigger?: NO
Rate S/N Ratio: 10.8627804912002 [ if not an image trigger ]
Image S/N Ratio: 9.22
Flight Position: [ source = BAT ]
RA: 266.265032609865 Dec: -28.9518822403057 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 266.21127319791 Dec: -28.9656726797808 [deg; J2000]
{ 17h 44m 50.7s , -28d 57' 56.4" }
+/- 3.36948676563099 [arcmin] (estimated 90% radius based on SNR)
+/- 1.70545774781421 [arcmin] (formal 1-sigma fit error)
SNR: 5.36359371182918
RA = 17h 44m 50.7s (266.211273 deg.)
Dec = -28d 57' 56" (-28.965673 deg.)
Angular difference between Flight and Ground position is 2.941058 arcmin
Partial Coding Fraction: 0.8828125 [ including projection effects ]
Duration
T90: 8.19200000166893 +/-
Measured from: 0
to: 8.19200000166893 [s; relative to TRIGTIME]
T50: 8.19200000166893 +/-
Measured from: 0
to: 8.19200000166893 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 8.19200000166893 second)
Measured from: -1.49011611938477e-08
to: 8.19199998676777 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 8.19200000166893 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.163079 -0.027586 0.009460 0.006815
0.017938 0.015344 0.012506 0.010513 [error]
Peak 0.163079 -0.027586 0.009460 0.006815
0.017938 0.015344 0.012506 0.010513 [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 4.45e-08 7.01e-09 5.11e-10 3.97e-11 5.20e-08 5.21e-08 erg/cm2
Error 1.02e-08 4.48e-09 8.09e-10 1.23e-10 1.39e-08 1.39e-08 erg/cm2
Peak flux Power-law 1.91e-01 1.76e-02 6.41e-04 2.42e-05 2.09e-01 2.10e-01 ph/cm2/s
Error 4.28e-02 1.08e-02 9.88e-04 7.08e-05 5.02e-02 5.03e-02 ph/cm2/s
Fluence Cutoff-PL 5.22e-08 3.86e-09 9.77e-13 7.26e-21 5.60e-08 5.61e-08 erg/cm2
Error 1.10e-08 2.94e-09 1.92e-11 1.17e-15 1.27e-08 1.27e-08 erg/cm2
Peak flux Cutoff-PL 1.91e-01 1.75e-02 6.37e-04 2.39e-05 2.09e-01 2.08e-01 ph/cm2/s
Error 4.28e-02 1.08e-02 9.86e-04 7.02e-05 5.02e-02 5.02e-02 ph/cm2/s
Fluence Band 4.41e-08 7.59e-09 3.56e-10 1.76e-11 5.67e-08 6.29e-08 erg/cm2
Error 1.34e-08 1.24e-08 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.99e-01 1.74e-02 2.80e-04 3.15e-06 2.16e-01 2.16e-01 ph/cm2/s
Error 4.28e-02 5.19e-03 4.29e-04 1.16e-05 5.06e-02 4.66e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.780 1.007 - - 6.32e-05 8.27e-05 60.367 57
CPL -2.391 0.000 10.6 2.8 5.78e+02 7.37e+02 54.143 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 5.780 1.007 - - 6.32e-05 8.27e-05 60.367 57
CPL -2.391 0.000 10.6 2.8 5.78e+02 7.37e+02 54.143 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 8.192 0.000 8.192
T90 8.192 0.000 8.192
T50 8.192 0.000 8.192
Peak 8.192 -0.000 8.192
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
266.2113 -28.9657 0.0358 20.4 -139.1 0.1513 5.4 TRIG_00257213
------------------------------------------
Foreground time interval of the image:
0.000 8.192 (delta_t = 8.192 [sec])
Background time interval of the image:
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 0.000 sec. to 8.192 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.78047 ( -0.899632 1.11456 )
Norm@50keV : 6.322248E-05 ( -6.322248E-05 1.021575E-04) )
------------------------------------------------------------
Chi-Squared = 60.36667 using 59 PHA bins.
Reduced chi-squared = 1.059064 for 57 degrees of freedom
Null hypothesis probability = 0.355
Photon flux (15-150 keV) in 8.192 sec: 0.208945 ( -0.049966 0.05048 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.20048e-08 ( -1.35712e-08 1.42799e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 8.192 sec.
Parameters : value lower 90% higher 90%
Photon index: -2.39073 ( )
Epeak [keV] : 10.6073 ( -3.71110 1.89292 )
Norm@50keV : 578.107 ( -643.141 831.153 )
------------------------------------------------------------
Chi-Squared = 54.14320 using 59 PHA bins.
but latest trial 6.90347 gives Chi-Squared = 1.55740
but latest trial 1835.70 gives Chi-Squared = 64.9186
Reduced chi-squared = 0.9668428 for 56 degrees of freedom
Null hypothesis probability = 0.545
Photon flux (15-150 keV) in 8.192 sec: 0.208718 ( -0.049957 0.050463 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.60432e-08 ( -1.26337e-08 1.28048e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.62850 ( -0.147862 4.11182 )
beta : -2.94954 ( -1.11092 0.903944 )
Epeak [keV] : 11.0918 ( -10.9918 9988.91 )
Norm@50keV : 3.209300E-03 ( -8.552773E-03 1.391741E-02) )
------------------------------------------------------------
Chi-Squared = 99.90534 using 59 PHA bins.
Reduced chi-squared = 1.816461 for 55 degrees of freedom
Null hypothesis probability = 2.037E-04
Photon flux (15-150 keV) in 8.192 sec: 0.216330 ( -0.054507 0.046654 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.66999e-08 ( -1.30688e-08 1.17839e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.78047 ( -0.899632 1.11456 )
Norm@50keV : 6.322248E-05 ( -6.322248E-05 1.021575E-04) )
------------------------------------------------------------
Chi-Squared = 60.36667 using 59 PHA bins.
Reduced chi-squared = 1.059064 for 57 degrees of freedom
Null hypothesis probability = 0.355
Photon flux (15-150 keV) in 8.192 sec: 0.208945 ( -0.049966 0.05048 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.20048e-08 ( -1.35712e-08 1.42799e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 8.192 sec.
Parameters : value lower 90% higher 90%
Photon index: -2.39073 ( )
Epeak [keV] : 10.6073 ( -3.71110 1.89292 )
Norm@50keV : 578.107 ( -643.141 831.153 )
------------------------------------------------------------
Chi-Squared = 54.14320 using 59 PHA bins.
but latest trial 6.90347 gives Chi-Squared = 1.55740
but latest trial 1835.70 gives Chi-Squared = 64.9186
Reduced chi-squared = 0.9668428 for 56 degrees of freedom
Null hypothesis probability = 0.545
Photon flux (15-150 keV) in 8.192 sec: 0.208718 ( -0.049957 0.050463 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.60432e-08 ( -1.26337e-08 1.28048e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 8.192 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.62850 ( -0.147862 4.11182 )
beta : -2.94954 ( -1.11092 0.903944 )
Epeak [keV] : 11.0918 ( -10.9918 9988.91 )
Norm@50keV : 3.209300E-03 ( -8.552773E-03 1.391741E-02) )
------------------------------------------------------------
Chi-Squared = 99.90534 using 59 PHA bins.
Reduced chi-squared = 1.816461 for 55 degrees of freedom
Null hypothesis probability = 2.037E-04
Photon flux (15-150 keV) in 8.192 sec: 0.216330 ( -0.054507 0.046654 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.66999e-08 ( -1.30688e-08 1.17839e-08 ) ergs/cm2
Plot creation:
Thu Dec 13 11:55:07 EST 2007