batgrbproduct Analysis for Trigger=282066
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): Fri Dec 14 01:24:28 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger282066/GCN5_download_cron
======================================================================
Trigger: 00282066 Segment: 000
BAT Trigger Time: 203308728 [s; MET]
Trigger Stop: 203308792 [s; MET]
UTC: 2007-06-12T02:38:45.983960 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 121.385105116276 Dec: 37.2655808388602 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.22
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 14.22
Flight Position: [ source = BAT ]
RA: 121.385105116276 Dec: 37.2655808388602 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 121.351470927989 Dec: 37.2603851399356 [deg; J2000]
{ 08h 05m 24.4s , +37d 15' 37.4" }
+/- 1.37434878341208 [arcmin] (estimated 90% radius based on SNR)
+/- 0.605301821581447 [arcmin] (formal 1-sigma fit error)
SNR: 19.3124336728881
RA = 8h 5m 24.4s (121.351471 deg.)
Dec = 37d 15' 37" (37.260385 deg.)
Angular difference between Flight and Ground position is 1.636071 arcmin
Partial Coding Fraction: 0.1181641 [ including projection effects ]
Duration
T90: 370.447999954224 +/- 54.0578090609156
Measured from: 1.03200000524521
to: 371.479999959469 [s; relative to TRIGTIME]
T50: 188.703999996185 +/- 12.8869298042265
Measured from: 31.6399999856949
to: 220.34399998188 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 10.363999992609
to: 11.363999992609 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.69600000977516
to: 417.831999987364 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 5.165304 6.018850 4.594601 0.965128
0.276686 0.282617 0.251164 0.216924 [error]
Peak 0.037653 0.063956 0.070252 0.033027
0.014468 0.014767 0.014296 0.011702 [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 1.75e-06 2.86e-06 3.55e-06 8.72e-06 1.06e-05 1.67e-05 erg/cm2
Error 1.67e-07 1.61e-07 2.53e-07 1.36e-06 6.01e-07 1.55e-06 erg/cm2
Peak flux Power-law 4.20e-01 4.84e-01 4.00e-01 5.56e-01 1.51e+00 1.86e+00 ph/cm2/s
Error 1.91e-01 1.38e-01 9.56e-02 2.78e-01 3.72e-01 4.16e-01 ph/cm2/s
Fluence Cutoff-PL 1.72e-06 2.89e-06 3.58e-06 7.74e-06 1.06e-05 1.54e-05 erg/cm2
Error 1.93e-07 1.85e-07 2.67e-07 2.74e-06 6.47e-07 2.85e-06 erg/cm2
Peak flux Cutoff-PL 3.69e-01 4.91e-01 4.28e-01 4.04e-01 1.48e+00 1.69e+00 ph/cm2/s
Error 2.41e-01 1.49e-01 1.29e-01 3.52e-01 3.85e-01 4.07e-01 ph/cm2/s
Fluence Band 1.69e-06 2.92e-06 3.52e-06 8.33e-06 1.05e-05 1.66e-05 erg/cm2
Error 2.02e-07 1.87e-07 2.45e-07 1.05e-06 6.15e-07 7.15e-07 erg/cm2
Peak flux Band 3.69e-01 4.91e-01 4.28e-01 4.04e-01 1.48e+00 1.69e+00 ph/cm2/s
Error 2.41e-01 1.49e-01 1.30e-01 3.55e-01 3.85e-01 5.37e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.690 0.098 - - 2.72e-03 1.47e-04 54.760 57
CPL 1.608 0.276 243.7 4958.9 2.99e-03 9.83e-04 54.615 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.274 0.387 - - 1.27e-02 2.88e-03 59.641 57
CPL 0.866 1.418 171.3 4963.2 1.88e-02 1.87e-02 59.399 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: 224.512000 sec.
T50 in the 50-300 keV band: 172.352000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 422.528 -4.696 417.832
T90 370.448 1.032 371.480
T50 188.704 31.640 220.344
Peak 1.000 10.364 11.364
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
121.3515 +37.2604 0.0100 40.0 -108.5 19.0641 19.3 TRIG_00282066
------------------------------------------
Foreground time interval of the image:
-4.696 14.810 (delta_t = 19.506 [sec])
16.000 417.832 (delta_t = 401.832 [sec])
Background time interval of the image:
-239.000 -151.050 (delta_t = 87.950 [sec])
-150.000 -56.966 (delta_t = 93.034 [sec])
-56.000 -4.696 (delta_t = 51.304 [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
Multiple GTIs in the spectrum
tstart tstop
-4.696000 14.810000
16.000000 417.832000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68967 ( -9.814167E-02 9.870458E-02) )
Norm@50keV : 2.720828E-03 ( -1.475483E-04 1.468139E-04) )
------------------------------------------------------------
Chi-Squared = 54.76026 using 59 PHA bins.
Reduced chi-squared = 0.9607063 for 57 degrees of freedom
Null hypothesis probability = 0.560
Photon flux (15-150 keV) in 421.3 sec: 0.360062 ( -0.020375 0.020465 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.06227e-05 ( -6.00352e-07 6.01153e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-4.696000 14.810000
16.000000 417.832000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60788 ( -0.375871 0.176780 )
Epeak [keV] : 243.719 ( -161.459 9756.28 )
Norm@50keV : 2.988954E-03 ( -4.071170E-04 1.558502E-03) )
------------------------------------------------------------
Chi-Squared = 54.61499 using 59 PHA bins.
Reduced chi-squared = 0.9752678 for 56 degrees of freedom
Null hypothesis probability = 0.527
Photon flux (15-150 keV) in 421.3 sec: 0.358506 ( -0.021294 0.021291 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05724e-05 ( -6.54616e-07 6.38691e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-4.696000 14.810000
16.000000 417.832000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.621352 ( -10.5586 2.19867 )
beta : -1.72533 ( -0.116362 0.115612 )
Epeak [keV] : 34.5777 ( -28.6180 104.305 )
Norm@50keV : 1.586646E-02 ( -3.06199 239.349 )
------------------------------------------------------------
Chi-Squared = 53.37085 using 59 PHA bins.
Reduced chi-squared = 0.9703791 for 55 degrees of freedom
Null hypothesis probability = 0.537
Photon flux (15-150 keV) in 421.3 sec: 0.356525 ( -0.022599 0.020963 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05438e-05 ( -6.37216e-07 5.92264e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 10.360 sec. to 11.368 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27363 ( -0.395340 0.378595 )
Norm@50keV : 1.268107E-02 ( -2.895412E-03 2.869392E-03) )
------------------------------------------------------------
Chi-Squared = 59.64050 using 59 PHA bins.
Reduced chi-squared = 1.046325 for 57 degrees of freedom
Null hypothesis probability = 0.380
Photon flux (15-150 keV) in 1.008 sec: 1.50580 ( -0.37007 0.37416 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27226e-07 ( -2.91634e-08 2.91161e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 10.360 sec. to 11.368 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.865613 ( -2.06852 0.766796 )
Epeak [keV] : 171.273 ( -97.6585 9828.73 )
Norm@50keV : 1.882217E-02 ( -8.857755E-03 2.848787E-02) )
------------------------------------------------------------
Chi-Squared = 59.39860 using 59 PHA bins.
but latest trial 4.730696E-02 gives Chi-Squared = 54.6729
Reduced chi-squared = 1.060689 for 56 degrees of freedom
Null hypothesis probability = 0.353
Photon flux (15-150 keV) in 1.008 sec: 1.47887 ( -0.3847 0.3844 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27027e-07 ( -3.84945e-08 2.93348e-08 ) ergs/cm2
Band function
Time interval is from 10.360 sec. to 11.368 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.838495 ( -3.95981 2.04076 )
beta : -9.20015 ( -0.799849 8.30227 )
Epeak [keV] : 165.661 ( -165.561 9834.34 )
Norm@50keV : 1.930369E-02 ( -9.339606E-03 8.785190E-02) )
------------------------------------------------------------
Chi-Squared = 59.39734 using 59 PHA bins.
Reduced chi-squared = 1.079952 for 55 degrees of freedom
Null hypothesis probability = 0.319
Photon flux (15-150 keV) in 1.008 sec: 1.47897 ( -0.38473 0.38436 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27019e-07 ( -2.93565e-08 2.92985e-08 ) ergs/cm2
Plot creation:
Fri Dec 14 01:41:48 EST 2007