batgrbproduct Analysis for Trigger=141088
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 Jan 10 17:59:03 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger141088/SDC
======================================================================
Trigger: 00141088 Segment: 000
BAT Trigger Time: 140462126.336 [s; MET]
Trigger Stop: 140462134.528 [s; MET]
UTC: 2005-06-14T17:15:26.763700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 132.809353623585 Dec: -42.4920216396168 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.69
Image Trigger?: NO
Rate S/N Ratio: 11.1803398874989 [ if not an image trigger ]
Image S/N Ratio: 10.69
Flight Position: [ source = BAT ]
RA: 132.809353623585 Dec: -42.4920216396168 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 132.884913541498 Dec: -42.4840575034254 [deg; J2000]
{ 08h 51m 32.4s , -42d 29' 02.6" }
+/- 3.13970302531733 [arcmin] (estimated 90% radius based on SNR)
+/- 1.91721063755605 [arcmin] (formal 1-sigma fit error)
SNR: 5.93304392483488
RA = 8h 51m 32.4s (132.884914 deg.)
Dec = -42d 29' 3" (-42.484058 deg.)
Angular difference between Flight and Ground position is 3.377134 arcmin
Partial Coding Fraction: 0.515625 [ including projection effects ]
Duration
T90: 45.1999999880791 +/- 4.55038681275507
Measured from: -22.7879999876022
to: 22.4120000004768 [s; relative to TRIGTIME]
T50: 22.2039999961853 +/- 7.5280300213012
Measured from: -12.6239999830723
to: 9.58000001311302 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.19200000166893
to: 2.19200000166893 [s; relative to TRIGTIME]
Total Fluence
Measured from: -24.7159999907017
to: 24.3440000116825 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.766051 0.665686 0.035628 -0.036975
0.049431 0.049742 0.042073 0.038396 [error]
Peak 0.036071 0.011381 0.010593 0.008491
0.007228 0.007156 0.006132 0.005559 [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 3.07e-07 2.49e-07 1.37e-07 1.10e-07 7.43e-07 8.03e-07 erg/cm2
Error 3.37e-08 2.80e-08 2.98e-08 4.28e-08 8.09e-08 1.01e-07 erg/cm2
Peak flux Power-law 3.70e-01 1.66e-01 4.46e-02 1.49e-02 5.89e-01 5.95e-01 ph/cm2/s
Error 1.40e-01 7.65e-02 4.43e-02 3.29e-02 1.94e-01 1.99e-01 ph/cm2/s
Fluence Cutoff-PL 2.96e-07 3.07e-07 2.36e-08 2.05e-11 6.27e-07 6.27e-07 erg/cm2
Error 3.55e-08 3.73e-08 1.80e-08 1.54e-10 5.91e-08 5.93e-08 erg/cm2
Peak flux Cutoff-PL 3.70e-01 1.66e-01 4.44e-02 1.47e-02 5.89e-01 5.95e-01 ph/cm2/s
Error 1.40e-01 7.65e-02 4.42e-02 3.25e-02 1.94e-01 1.99e-01 ph/cm2/s
Fluence Band 2.96e-07 3.02e-07 7.38e-08 2.42e-09 6.76e-07 6.90e-07 erg/cm2
Error 3.15e-08 2.64e-08 1.33e-09 6.12e-08 7.08e-08 0.00e+00 erg/cm2
Peak flux Band 3.79e-01 1.11e-01 1.72e-03 2.08e-05 5.75e-01 5.45e-01 ph/cm2/s
Error 7.18e-02 2.83e-02 9.06e-03 1.78e-01 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.866 0.198 - - 1.34e-03 2.20e-04 89.968 57
CPL -2.463 0.000 24.3 1.7 7.30e+00 5.94e+00 52.746 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.895 0.991 - - 2.31e-03 2.10e-03 64.856 57
CPL -2.491 0.000 18.2 4.3 5.79e+01 2.82e+02 63.279 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 49.060 -24.716 24.344
T90 45.200 -22.788 22.412
T50 22.204 -12.624 9.580
Peak 1.000 1.192 2.192
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
132.8849 -42.4841 0.0323 42.0 -14.8 0.8374 5.9 TRIG_00141088
------------------------------------------
Foreground time interval of the image:
-24.716 24.344 (delta_t = 49.060 [sec])
Background time interval of the image:
-60.336 -24.716 (delta_t = 35.620 [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 -24.716 sec. to 24.344 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.86605 ( -0.191560 0.204424 )
Norm@50keV : 1.335853E-03 ( -2.179941E-04 2.223653E-04) )
------------------------------------------------------------
Chi-Squared = 89.96796 using 59 PHA bins.
Reduced chi-squared = 1.578385 for 57 degrees of freedom
Null hypothesis probability = 3.501E-03
Photon flux (15-150 keV) in 49.06 sec: 0.333824 ( -0.031595 0.031598 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.42719e-07 ( -8.01101e-08 8.17438e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -24.716 sec. to 24.344 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.46304 ( )
Epeak [keV] : 24.3224 ( -1.66242 1.78390 )
Norm@50keV : 7.30270 ( -4.82132 7.06272 )
------------------------------------------------------------
Chi-Squared = 52.74577 using 59 PHA bins.
Reduced chi-squared = 0.9418887 for 56 degrees of freedom
Null hypothesis probability = 0.599
Photon flux (15-150 keV) in 49.06 sec: 0.319012 ( -0.02931 0.030089 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.26702e-07 ( -5.65515e-08 6.17126e-08 ) ergs/cm2
Band function
Time interval is from -24.716 sec. to 24.344 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.81170 ( -0.185882 0.134927 )
beta : -9.19302 ( -0.806978 5.89625 )
Epeak [keV] : 6.17305 ( -1.86896 2.32676 )
Norm@50keV : 6.533167E-03 ( -15.8902 200.257 )
------------------------------------------------------------
Chi-Squared = 73.52638 using 59 PHA bins.
Reduced chi-squared = 1.336843 for 55 degrees of freedom
Null hypothesis probability = 4.828E-02
Photon flux (15-150 keV) in 49.06 sec: 0.331949 ( -0.030075 0.030075 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.75527e-07 ( -6.11974e-08 6.11091e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.192 sec. to 2.192 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.89499 ( -0.854975 1.12720 )
Norm@50keV : 2.310621E-03 ( -2.310621E-03 1.890107E-03) )
------------------------------------------------------------
Chi-Squared = 64.85645 using 59 PHA bins.
Reduced chi-squared = 1.137833 for 57 degrees of freedom
Null hypothesis probability = 0.222
Photon flux (15-150 keV) in 1.000 sec: 0.589340 ( -0.194083 0.19417 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.65283e-08 ( -1.11133e-08 1.33367e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.192 sec. to 2.192 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49118 ( )
Epeak [keV] : 18.1824 ( -4.03982 4.64535 )
Norm@50keV : 57.9005 ( -146.600 416.486 )
------------------------------------------------------------
Chi-Squared = 63.27863 using 59 PHA bins.
Reduced chi-squared = 1.129976 for 56 degrees of freedom
Null hypothesis probability = 0.235
Photon flux (15-150 keV) in 1.000 sec: 0.589004 ( -0.194018 0.19411 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.64926e-08 ( -1.10815e-08 1.33408e-08 ) ergs/cm2
Band function
Time interval is from 1.192 sec. to 2.192 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.56487 ( -1.07515 13.9249 )
beta : -2.75349 ( -1.12799 0.854062 )
Epeak [keV] : 10.7904 ( -10.6904 9989.21 )
Norm@50keV : 1.720071E-02 ( -0.314244 0.256884 )
------------------------------------------------------------
Chi-Squared = 65.05115 using 59 PHA bins.
Reduced chi-squared = 1.182748 for 55 degrees of freedom
Null hypothesis probability = 0.166
Photon flux (15-150 keV) in 1.000 sec: 0.575475 ( -0.177466 0.178633 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.92954e-07 ( -7.92954e-07 2.72788e-06 ) ergs/cm2
Plot creation:
Thu Jan 10 18:07:27 EST 2008