batgrbproduct Analysis for Trigger=145011
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 12:37:57 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger145011/GCN5_download_cron
======================================================================
Trigger: 00145011 Segment: 000
BAT Trigger Time: 142594520 [s; MET]
Trigger Stop: 142594584 [s; MET]
UTC: 2005-07-09T09:35:20.387100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 273.581178445992 Dec: -17.1302817148166 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 33280
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 33280
Flight Position: [ source = BAT ]
RA: 273.581178445992 Dec: -17.1302817148166 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 273.583897293976 Dec: -17.1323676960533 [deg; J2000]
{ 18h 14m 20.1s , -17d 07' 56.5" }
+/- 15.8240618397808 [arcmin] (estimated 90% radius based on SNR)
+/- 16.5280977445037 [arcmin] (formal 1-sigma fit error)
SNR: 0.588582021414536
RA = 18h 14m 20.1s (273.583897 deg.)
Dec = -17d 7' 57" (-17.132368 deg.)
Angular difference between Flight and Ground position is 0.199918 arcmin
Partial Coding Fraction: 0.796875 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.174330 0.009148 -0.057061 -0.023927
0.033215 0.030550 0.025929 0.022194 [error]
Peak 0.174330 0.009148 -0.057061 -0.023927
0.033215 0.030550 0.025929 0.022194 [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 4.05e-08 1.75e-08 4.48e-09 1.42e-09 6.33e-08 6.35e-08 erg/cm2
Error 1.49e-08 1.20e-08 6.79e-09 4.44e-09 2.97e-08 3.12e-08 erg/cm2
Peak flux Power-law 4.16e-02 1.01e-02 1.28e-03 1.82e-04 5.33e-02 5.31e-02 ph/cm2/s
Error 1.53e-02 6.76e-03 1.93e-03 5.48e-04 2.05e-02 2.05e-02 ph/cm2/s
Fluence Cutoff-PL 4.05e-08 1.75e-08 4.48e-09 1.41e-09 6.33e-08 6.35e-08 erg/cm2
Error 1.49e-08 1.20e-08 6.79e-09 4.40e-09 2.97e-08 3.12e-08 erg/cm2
Peak flux Cutoff-PL 4.16e-02 1.03e-02 1.32e-03 1.88e-04 5.33e-02 5.34e-02 ph/cm2/s
Error 1.53e-02 6.76e-03 1.93e-03 5.45e-04 2.07e-02 2.08e-02 ph/cm2/s
Fluence Band 7.34e-08 1.88e-08 2.44e-09 3.44e-11 6.74e-08 6.01e-07 erg/cm2
Error 2.53e-08 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 4.54e-02 1.24e-02 4.50e-04 1.97e-06 5.83e-02 5.83e-02 ph/cm2/s
Error 1.67e-02 7.97e-03 1.24e-03 1.59e-04 2.03e-02 2.05e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.927 1.144 - - 9.24e-05 1.07e-04 54.601 57
CPL 1.761 0.000 2.7 25.8 4.63e-03 0.00e+00 52.405 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.927 1.144 - - 9.24e-05 1.07e-04 54.601 57
CPL 1.761 0.000 2.7 25.8 4.63e-03 0.00e+00 52.405 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
273.5839 -17.1324 0.3260 16.5 106.0 0.0323 0.6 TRIG_00145011
------------------------------------------
Foreground time interval of the image:
0.000 33.053 (delta_t = 33.053 [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 33.053 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.92731 ( -0.876005 1.41132 )
Norm@50keV : 9.241596E-05 ( -9.241596E-05 1.210730E-04) )
------------------------------------------------------------
Chi-Squared = 54.60110 using 59 PHA bins.
Reduced chi-squared = 0.9579140 for 57 degrees of freedom
Null hypothesis probability = 0.566
Photon flux (15-150 keV) in 33.05 sec: 5.334604E-02 ( -0.0199604 0.0209472 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.32544e-08 ( -2.73684e-08 3.20235e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.053 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76137 ( )
Epeak [keV] : 2.67807 ( -6.17884 45.5004 )
Norm@50keV : 4.629687E-03 ( )
------------------------------------------------------------
Chi-Squared = 52.40520 using 59 PHA bins.
but latest trial 44.7926 gives Chi-Squared = 16.2637
Reduced chi-squared = 0.9358072 for 56 degrees of freedom
Null hypothesis probability = 0.612
Photon flux (15-150 keV) in 33.05 sec: 5.325680E-02 ( -0.0204189 0.0210157 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.32709e-08 ( -2.74146e-08 3.20192e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.053 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.88309 ( -8.05865 0.482719 )
beta : -9.24471 ( -0.634096 6.10830 )
Epeak [keV] : 10.8326 ( -0.402953 213.925 )
Norm@50keV : 4.568097E-04 ( -3.153510E-03 7.823439E-03) )
------------------------------------------------------------
Chi-Squared = 64.66109 using 59 PHA bins.
Reduced chi-squared = 1.175656 for 55 degrees of freedom
Null hypothesis probability = 0.175
Photon flux (15-150 keV) in 33.05 sec: 5.825407E-02 ( -0.0202693 0.0203464 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.74339e-08 ( -2.70765e-08 2.3568e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.053 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.92731 ( -0.876005 1.41132 )
Norm@50keV : 9.241596E-05 ( -9.241596E-05 1.210730E-04) )
------------------------------------------------------------
Chi-Squared = 54.60110 using 59 PHA bins.
Reduced chi-squared = 0.9579140 for 57 degrees of freedom
Null hypothesis probability = 0.566
Photon flux (15-150 keV) in 33.05 sec: 5.334604E-02 ( -0.0199604 0.0209472 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.32544e-08 ( -2.73684e-08 3.20235e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.053 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76137 ( )
Epeak [keV] : 2.67807 ( -6.17884 45.5004 )
Norm@50keV : 4.629687E-03 ( )
------------------------------------------------------------
Chi-Squared = 52.40520 using 59 PHA bins.
but latest trial 44.7926 gives Chi-Squared = 16.2637
Reduced chi-squared = 0.9358072 for 56 degrees of freedom
Null hypothesis probability = 0.612
Photon flux (15-150 keV) in 33.05 sec: 5.325680E-02 ( -0.0204189 0.0210157 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.32709e-08 ( -2.74146e-08 3.20192e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.053 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.88309 ( -7.15147 0.482719 )
beta : -9.24471 ( -1.38425 0.904175 )
Epeak [keV] : 10.8326 ( -10.7326 9989.17 )
Norm@50keV : 4.568097E-04 ( -1.841581E-02 0.728592 )
------------------------------------------------------------
Chi-Squared = 64.66109 using 59 PHA bins.
Reduced chi-squared = 1.175656 for 55 degrees of freedom
Null hypothesis probability = 0.175
Photon flux (15-150 keV) in 33.05 sec: 5.825407E-02 ( -0.0202693 0.0203464 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.74339e-08 ( -2.70765e-08 2.3568e-08 ) ergs/cm2
Plot creation:
Mon Jan 7 12:42:12 EST 2008