batgrbproduct Analysis for Trigger=229185
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): Wed Jan 2 04:23:00 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger229185/GCN5_download_cron
======================================================================
Trigger: 00229185 Segment: 000
BAT Trigger Time: 179762155.584 [s; MET]
Trigger Stop: 179762156.608 [s; MET]
UTC: 2006-09-12T13:55:54.144260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 5.28584793860298 Dec: 20.9715924063833 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 19.85
Image Trigger?: NO
Rate S/N Ratio: 81.3879597975032 [ if not an image trigger ]
Image S/N Ratio: 19.85
Flight Position: [ source = BAT ]
RA: 5.28584793860298 Dec: 20.9715924063833 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 5.28142841761413 Dec: 20.9685989496078 [deg; J2000]
{ 00h 21m 07.5s , +20d 58' 07.0" }
+/- 0.904823282199918 [arcmin] (estimated 90% radius based on SNR)
+/- 0.267952706323004 [arcmin] (formal 1-sigma fit error)
SNR: 35.0889313228669
RA = 0h 21m 7.5s (5.281428 deg.)
Dec = 20d 58' 7" (20.968599 deg.)
Angular difference between Flight and Ground position is 0.305890 arcmin
Partial Coding Fraction: 0.3359375 [ including projection effects ]
Duration
T90: 5.0440000295639 +/- 0.579999999547827
Measured from: -0.131999999284744
to: 4.91200003027916 [s; relative to TRIGTIME]
T50: 1.75600001215935 +/- 0.186290068818423
Measured from: 0.376000016927719
to: 2.13200002908707 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0
to: 1 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.563999980688095
to: 6.11599999666214 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.716063 0.821953 0.569198 0.120961
0.027358 0.029063 0.025193 0.020407 [error]
Peak 0.274784 0.385600 0.244499 0.050386
0.013868 0.015269 0.013196 0.009473 [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 2.35e-07 3.72e-07 4.44e-07 1.03e-06 1.35e-06 2.09e-06 erg/cm2
Error 1.91e-08 1.72e-08 2.65e-08 1.39e-07 6.17e-08 1.55e-07 erg/cm2
Peak flux Power-law 3.19e+00 2.88e+00 1.79e+00 1.70e+00 8.58e+00 9.56e+00 ph/cm2/s
Error 2.75e-01 1.51e-01 1.13e-01 2.19e-01 4.42e-01 4.64e-01 ph/cm2/s
Fluence Cutoff-PL 2.35e-07 3.72e-07 4.45e-07 1.03e-06 1.35e-06 1.83e-06 erg/cm2
Error 1.91e-08 1.72e-08 2.66e-08 1.38e-07 6.17e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.97e+00 2.98e+00 1.85e+00 1.14e+00 8.42e+00 8.93e+00 ph/cm2/s
Error 3.29e-01 1.75e-01 1.28e-01 4.06e-01 4.60e-01 6.23e-01 ph/cm2/s
Fluence Band 2.29e-07 3.71e-07 4.44e-07 1.03e-06 1.35e-06 1.90e-06 erg/cm2
Error 2.09e-08 1.71e-08 2.65e-08 1.38e-07 6.16e-08 0.00e+00 erg/cm2
Peak flux Band 2.97e+00 2.98e+00 1.85e+00 1.14e+00 8.42e+00 8.94e+00 ph/cm2/s
Error 3.29e-01 1.75e-01 1.28e-01 4.06e-01 4.61e-01 6.24e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.743 0.086 - - 2.19e-02 9.67e-04 61.136 57
CPL 1.711 0.156 441.0 0.0 2.27e-02 9.71e-04 61.453 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.684 0.087 - - 6.49e-02 3.25e-03 45.721 57
CPL 1.305 0.342 92.8 118.7 1.01e-01 4.02e-02 41.740 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: 5.632000 sec.
T50 in the 50-300 keV band: 1.920000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 6.680 -0.564 6.116
T90 5.044 -0.132 4.912
T50 1.756 0.376 2.132
Peak 1.000 0.000 1.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
5.2814 +20.9686 0.0055 33.2 125.7 2.2466 35.1 TRIG_00229185
------------------------------------------
Foreground time interval of the image:
-0.564 6.116 (delta_t = 6.680 [sec])
Background time interval of the image:
-239.584 -0.564 (delta_t = 239.020 [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 -0.564 sec. to 6.116 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74286 ( -8.516479E-02 8.593845E-02) )
Norm@50keV : 2.189389E-02 ( -9.681433E-04 9.649731E-04) )
------------------------------------------------------------
Chi-Squared = 61.13601 using 59 PHA bins.
Reduced chi-squared = 1.072562 for 57 degrees of freedom
Null hypothesis probability = 0.330
Photon flux (15-150 keV) in 6.680 sec: 2.95267 ( -0.13899 0.13958 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.35005e-06 ( -6.16096e-08 6.18501e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.564 sec. to 6.116 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71106 ( -0.189599 0.121711 )
Epeak [keV] : 441.025 ( )
Norm@50keV : 2.272807E-02 ( -9.722803E-04 9.691454E-04) )
------------------------------------------------------------
Chi-Squared = 61.45306 using 59 PHA bins.
Reduced chi-squared = 1.097376 for 56 degrees of freedom
Null hypothesis probability = 0.287
Photon flux (15-150 keV) in 6.680 sec: 2.95111 ( -0.13892 0.13952 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.35019e-06 ( -6.16364e-08 6.18568e-08 ) ergs/cm2
Band function
Time interval is from -0.564 sec. to 6.116 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.18261 ( -8.81739 2.59795 )
beta : -1.74705 ( -9.835923E-02 8.755541E-02) )
Epeak [keV] : 31.2676 ( -31.1676 9968.73 )
Norm@50keV : 6.187234E-02 ( -6.187234E-02 302.893 )
------------------------------------------------------------
Chi-Squared = 61.01851 using 59 PHA bins.
Reduced chi-squared = 1.109427 for 55 degrees of freedom
Null hypothesis probability = 0.269
Photon flux (15-150 keV) in 6.680 sec: 2.94987 ( -0.07424 0.13545 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34847e-06 ( -6.14961e-08 6.16631e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68428 ( -8.645368E-02 8.712113E-02) )
Norm@50keV : 6.494950E-02 ( -3.257751E-03 3.248475E-03) )
------------------------------------------------------------
Chi-Squared = 45.72053 using 59 PHA bins.
Reduced chi-squared = 0.8021146 for 57 degrees of freedom
Null hypothesis probability = 0.858
Photon flux (15-150 keV) in 1.000 sec: 8.57921 ( -0.44159 0.44247 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.02134e-07 ( -3.1508e-08 3.1608e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30513 ( -0.355262 0.327787 )
Epeak [keV] : 92.7609 ( -23.4842 213.996 )
Norm@50keV : 0.100623 ( -3.095873E-02 4.945318E-02) )
------------------------------------------------------------
Chi-Squared = 41.73995 using 59 PHA bins.
Reduced chi-squared = 0.7453563 for 56 degrees of freedom
Null hypothesis probability = 0.922
Photon flux (15-150 keV) in 1.000 sec: 8.42383 ( -0.45996 0.46004 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.88624e-07 ( -3.3958e-08 3.4117e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.30569 ( -0.327245 0.355876 )
beta : -8.85036 ( -8.19708 0.141816 )
Epeak [keV] : 92.8489 ( -11.3106 146.928 )
Norm@50keV : 0.100528 ( -8.18915 2811.97 )
------------------------------------------------------------
Chi-Squared = 41.73976 using 59 PHA bins.
Reduced chi-squared = 0.7589047 for 55 degrees of freedom
Null hypothesis probability = 0.906
Photon flux (15-150 keV) in 1.000 sec: 8.42357 ( -0.46043 0.46113 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.88244e-07 ( -3.4112e-08 3.3915e-08 ) ergs/cm2
Plot creation:
Wed Jan 2 04:38:17 EST 2008