batgrbproduct Analysis for Trigger=131005
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): Sun Jan 6 18:18:19 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger131005/SDC
======================================================================
Trigger: 00131005 Segment: 000
BAT Trigger Time: 139074911.616 [s; MET]
Trigger Stop: 139074919.808 [s; MET]
UTC: 2005-05-29T15:55:12.069640 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 84.7349801976583 Dec: 26.3158421681598 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6
Image Trigger?: NO
Rate S/N Ratio: 10.0498756211209 [ if not an image trigger ]
Image S/N Ratio: 6
Flight Position: [ source = BAT ]
RA: 84.7349801976583 Dec: 26.3158421681598 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 84.7646532374071 Dec: 26.3337408708085 [deg; J2000]
{ 05h 39m 03.5s , +26d 20' 01.5" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 1.93257692553025 [arcmin] (formal 1-sigma fit error)
SNR: -4.99316090900555
RA = 5h 39m 3.5s (84.764653 deg.)
Dec = 26d 20' 1" (26.333741 deg.)
Angular difference between Flight and Ground position is 1.923465 arcmin
Partial Coding Fraction: 0.2695312 [ including projection effects ]
Duration
T90: 51 +/- 244.165927188869
Measured from: -276.615999996662
to: -225.615999996662 [s; relative to TRIGTIME]
T50: 42 +/- 251.447807705695
Measured from: -272.615999996662
to: -230.615999996662 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.38400000333786
to: 4.38400000333786 [s; relative to TRIGTIME]
Total Fluence
Measured from: -278.615999996662
to: 17.3840000033379 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 19.786756 16.174841 2.565160 0.184871
0.191947 0.194948 0.165809 0.133916 [error]
Peak 0.100208 0.116862 0.013239 0.008032
0.012049 0.012169 0.010242 0.007790 [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 9.59e-06 6.66e-06 3.04e-06 1.93e-06 2.02e-05 2.12e-05 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Power-law 1.25e+00 7.45e-01 2.82e-01 1.42e-01 2.36e+00 2.42e+00 ph/cm2/s
Error 2.09e-01 1.08e-01 7.33e-02 6.54e-02 3.21e-01 3.32e-01 ph/cm2/s
Fluence Cutoff-PL 9.59e-06 6.67e-06 3.04e-06 1.92e-06 2.02e-05 2.12e-05 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.06e+00 1.04e+00 1.54e-01 1.21e-03 2.26e+00 2.26e+00 ph/cm2/s
Error 2.41e-01 1.63e-01 8.93e-02 5.49e-03 3.14e-01 3.14e-01 ph/cm2/s
Fluence Band 7.09e-06 7.47e-06 2.17e-06 1.13e-07 1.70e-05 1.71e-05 erg/cm2
Error 5.15e-07 1.96e-07 1.25e-07 1.09e-07 4.75e-07 4.94e-07 erg/cm2
Peak flux Band 1.17e+00 9.57e-01 2.12e-01 1.08e-02 2.34e+00 2.34e+00 ph/cm2/s
Error 1.58e-01 1.31e-01 6.45e-02 3.07e-02 3.03e-01 3.03e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.132 0.000 - - 5.34e-03 0.00e+00 202.070 57
CPL 0.684 0.436 20.3 3.2 1.47e-01 9.40e-02 48.842 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.402 0.253 - - 1.27e-02 2.57e-03 73.791 57
CPL -1.304 1.630 30.7 4.1 3.06e+00 1.07e+01 55.265 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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 296.000 -278.616 17.384
T90 51.000 -276.616 -225.616
T50 42.000 -272.616 -230.616
Peak 1.000 3.384 4.384
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
84.7647 +26.3337 0.0384 35.8 -70.7 -6.6503 -5.0 TRIG_00131005
------------------------------------------
Foreground time interval of the image:
-278.616 17.384 (delta_t = 296.000 [sec])
Background time interval of the image:
-299.616 -278.616 (delta_t = 21.000 [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 -278.616 sec. to 17.384 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.13200 ( )
Norm@50keV : 5.337698E-03 ( )
------------------------------------------------------------
Chi-Squared = 202.0697 using 59 PHA bins.
Reduced chi-squared = 3.545082 for 57 degrees of freedom
Null hypothesis probability = 4.181E-18
Photon flux (15-150 keV) in 296.0 sec: 1.61844 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02301e-05 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -278.616 sec. to 17.384 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.684345 ( -0.453517 0.418757 )
Epeak [keV] : 20.2880 ( -3.66925 2.82804 )
Norm@50keV : 0.146653 ( -6.330080E-02 0.124724 )
------------------------------------------------------------
Chi-Squared = 48.84192 using 59 PHA bins.
Reduced chi-squared = 0.8721771 for 56 degrees of freedom
Null hypothesis probability = 0.740
Photon flux (15-150 keV) in 296.0 sec: 1.33722 ( -0.06748 0.06831 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.02279e-05 ( 0 0 ) ergs/cm2
Band function
Time interval is from -278.616 sec. to 17.384 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.36046 ( )
beta : -9.10445 ( )
Epeak [keV] : 17.4662 ( )
Norm@50keV : 4.116996E-02 ( )
------------------------------------------------------------
Chi-Squared = 125.4394 using 59 PHA bins.
Reduced chi-squared = 2.280716 for 55 degrees of freedom
Null hypothesis probability = 2.012E-07
Photon flux (15-150 keV) in 296.0 sec: 1.34416 ( -0.02828 0.05728 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69501e-05 ( -4.71439e-07 4.79106e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 3.384 sec. to 4.384 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.40217 ( -0.240427 0.266181 )
Norm@50keV : 1.271552E-02 ( -2.578757E-03 2.557372E-03) )
------------------------------------------------------------
Chi-Squared = 73.79063 using 59 PHA bins.
Reduced chi-squared = 1.294572 for 57 degrees of freedom
Null hypothesis probability = 6.663E-02
Photon flux (15-150 keV) in 1.000 sec: 2.35562 ( -0.32075 0.32079 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24132e-07 ( -2.0127e-08 2.0672e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.384 sec. to 4.384 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.30352 ( -1.69648 1.56264 )
Epeak [keV] : 30.7116 ( -4.14561 4.06798 )
Norm@50keV : 3.05913 ( -3.05913 18.3624 )
------------------------------------------------------------
Chi-Squared = 55.26545 using 59 PHA bins.
Reduced chi-squared = 0.9868830 for 56 degrees of freedom
Null hypothesis probability = 0.503
Photon flux (15-150 keV) in 1.000 sec: 2.25518 ( -0.31337 0.3149 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05286e-07 ( -1.5758e-08 1.7106e-08 ) ergs/cm2
Band function
Time interval is from 3.384 sec. to 4.384 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.704014 ( -4.37488 1.30003 )
beta : -5.00745 ( -5.90585 13.0959 )
Epeak [keV] : 27.4044 ( -2.52391 31.9699 )
Norm@50keV : 0.155243 ( -3.10821 709.384 )
------------------------------------------------------------
Chi-Squared = 59.79726 using 59 PHA bins.
Reduced chi-squared = 1.087223 for 55 degrees of freedom
Null hypothesis probability = 0.306
Photon flux (15-150 keV) in 1.000 sec: 2.34016 ( -0.30338 0.30256 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.11385e-07 ( -1.51801e-08 1.6015e-08 ) ergs/cm2
Plot creation:
Sun Jan 6 18:25:38 EST 2008