batgrbproduct Analysis for Trigger=114485
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 Jan 4 23:50:49 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger114485/SDC
======================================================================
Trigger: 00114485 Segment: 000
BAT Trigger Time: 134977442.368 [s; MET]
Trigger Stop: 134977444.416 [s; MET]
UTC: 2005-04-12T05:44:02.894760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 181.120322462344 Dec: -1.25227292288913 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9
Image Trigger?: NO
Rate S/N Ratio: 18.5741756210067 [ if not an image trigger ]
Image S/N Ratio: 9
Flight Position: [ source = BAT ]
RA: 181.120322462344 Dec: -1.25227292288913 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 181.098069490645 Dec: -1.18774470454552 [deg; J2000]
{ 12h 04m 23.5s , -01d 11' 15.9" }
+/- 1.51807395884139 [arcmin] (estimated 90% radius based on SNR)
+/- 0.862851545950794 [arcmin] (formal 1-sigma fit error)
SNR: 16.7543845564339
RA = 12h 4m 23.5s (181.098069 deg.)
Dec = -1d 11' 16" (-1.187745 deg.)
Angular difference between Flight and Ground position is 4.095351 arcmin
Partial Coding Fraction: 0.953125 [ including projection effects ]
Duration
T90: 26.5120000243187 +/- 3.46144937543315
Measured from: -6.34400001168251
to: 20.1680000126362 [s; relative to TRIGTIME]
T50: 7.55199998617172 +/- 3.88035721521118
Measured from: -1.65599998831749
to: 5.89599999785423 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.17599999904633
to: 2.17599999904633 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.28400000929832
to: 22.1559999883175 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.139450 0.247144 0.307730 0.132389
0.023805 0.024365 0.022117 0.019489 [error]
Peak 0.013574 0.014442 0.032141 0.013754
0.004361 0.004562 0.004366 0.003633 [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 3.25e-08 9.54e-08 2.29e-07 1.51e-06 6.18e-07 1.87e-06 erg/cm2
Error 7.15e-09 1.23e-08 2.00e-08 3.40e-07 5.54e-08 3.43e-07 erg/cm2
Peak flux Power-law 7.71e-02 1.28e-01 1.60e-01 4.01e-01 4.77e-01 7.66e-01 ph/cm2/s
Error 3.90e-02 3.93e-02 3.14e-02 1.82e-01 1.00e-01 1.80e-01 ph/cm2/s
Fluence Cutoff-PL 3.17e-08 9.55e-08 2.31e-07 1.50e-06 6.18e-07 1.71e-06 erg/cm2
Error 8.24e-09 1.25e-08 2.32e-08 3.38e-07 5.54e-08 5.64e-07 erg/cm2
Peak flux Cutoff-PL 6.37e-02 1.26e-01 1.71e-01 2.82e-01 4.69e-01 6.45e-01 ph/cm2/s
Error 5.09e-02 4.48e-02 4.39e-02 2.98e-01 7.81e-02 2.63e-01 ph/cm2/s
Fluence Band 3.21e-08 9.51e-08 2.28e-07 1.50e-06 6.18e-07 1.69e-06 erg/cm2
Error 8.00e-09 1.22e-08 2.00e-08 3.38e-07 5.54e-08 5.67e-07 erg/cm2
Peak flux Band 6.38e-02 1.26e-01 1.71e-01 2.83e-01 4.69e-01 6.43e-01 ph/cm2/s
Error 5.09e-02 4.54e-02 4.39e-02 2.98e-01 1.04e-01 2.63e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.740 0.172 - - 1.69e-03 1.64e-04 34.381 57
CPL 0.732 0.174 9997.4 5000.0 1.71e-03 1.64e-04 34.389 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.672 0.386 - - 4.12e-03 9.37e-04 73.814 57
CPL 0.184 1.635 253.6 5000.0 6.23e-03 1.51e-02 73.530 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: 28.096000 sec.
T50 in the 50-300 keV band: 8.704000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 30.440 -8.284 22.156
T90 26.512 -6.344 20.168
T50 7.552 -1.656 5.896
Peak 1.000 1.176 2.176
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
181.0981 -1.1877 0.0115 12.1 126.6 0.8654 16.8 TRIG_00114485
------------------------------------------
Foreground time interval of the image:
-8.284 22.156 (delta_t = 30.440 [sec])
Background time interval of the image:
-126.363 -8.284 (delta_t = 118.079 [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 -8.284 sec. to 22.156 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.739783 ( -0.176257 0.167722 )
Norm@50keV : 1.692653E-03 ( -1.655044E-04 1.617234E-04) )
------------------------------------------------------------
Chi-Squared = 34.38074 using 59 PHA bins.
Reduced chi-squared = 0.6031710 for 57 degrees of freedom
Null hypothesis probability = 0.992
Photon flux (15-150 keV) in 30.44 sec: 0.195109 ( -0.017894 0.017974 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.17886e-07 ( -5.52638e-08 5.54982e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.284 sec. to 22.156 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.731667 ( -0.177948 0.169163 )
Epeak [keV] : 9997.42 ( -9997.41 2.58203 )
Norm@50keV : 1.708425E-03 ( -1.691107E-04 1.591677E-04) )
------------------------------------------------------------
Chi-Squared = 34.38934 using 59 PHA bins.
Reduced chi-squared = 0.6140953 for 56 degrees of freedom
Null hypothesis probability = 0.990
Photon flux (15-150 keV) in 30.44 sec: 0.195054 ( -0.017888 0.018001 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.1816e-07 ( -5.53612e-08 5.55104e-08 ) ergs/cm2
Band function
Time interval is from -8.284 sec. to 22.156 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.811191 ( -9.18881 5.81119 )
beta : -0.739782 ( -0.167678 0.176241 )
Epeak [keV] : 20.3126 ( -20.2126 9979.69 )
Norm@50keV : 2.256285E-03 ( -7.273020E-04 28637.1 )
------------------------------------------------------------
Chi-Squared = 34.38075 using 59 PHA bins.
Reduced chi-squared = 0.6251046 for 55 degrees of freedom
Null hypothesis probability = 0.987
Photon flux (15-150 keV) in 30.44 sec: 0.195046 ( -0.017879 0.017955 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.17771e-07 ( -5.53491e-08 5.54556e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.176 sec. to 2.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.671802 ( -0.407302 0.364700 )
Norm@50keV : 4.117626E-03 ( -9.619417E-04 9.129723E-04) )
------------------------------------------------------------
Chi-Squared = 73.81425 using 59 PHA bins.
Reduced chi-squared = 1.294987 for 57 degrees of freedom
Null hypothesis probability = 6.639E-02
Photon flux (15-150 keV) in 1.000 sec: 0.477101 ( -0.099977 0.100971 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.08989e-08 ( -1.03403e-08 1.03954e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.176 sec. to 2.176 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.184361 ( -2.44468 0.825749 )
Epeak [keV] : 253.617 ( -253.607 9746.38 )
Norm@50keV : 6.230427E-03 ( -2.994399E-03 2.727919E-02) )
------------------------------------------------------------
Chi-Squared = 73.52962 using 59 PHA bins.
but latest trial 1.01011 gives Chi-Squared = 2.73063
Reduced chi-squared = 1.313029 for 56 degrees of freedom
Null hypothesis probability = 5.808E-02
Photon flux (15-150 keV) in 1.000 sec: 0.468621 ( -0.10405 0.052155 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.08519e-08 ( -1.05703e-08 1.05147e-08 ) ergs/cm2
Band function
Time interval is from 1.176 sec. to 2.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.867308 ( -9.13269 5.86731 )
beta : -0.671822 ( -0.364578 0.407326 )
Epeak [keV] : 13.1202 ( -13.0202 9986.88 )
Norm@50keV : 6.290980E-03 ( -3.110026E-03 75537.5 )
------------------------------------------------------------
Chi-Squared = 73.81426 using 59 PHA bins.
Reduced chi-squared = 1.342077 for 55 degrees of freedom
Null hypothesis probability = 4.605E-02
Photon flux (15-150 keV) in 1.000 sec: 0.468711 ( -0.104368 0.104074 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.08249e-08 ( -1.05665e-08 1.05072e-08 ) ergs/cm2
Plot creation:
Sat Jan 5 00:06:05 EST 2008