batgrbproduct Analysis for Trigger=423181
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 v2.46
Process Start Time (local time): Thu May 27 13:10:36 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger423181/GCN5_download_cron
======================================================================
Trigger: 00423181 Segment: 000
BAT Trigger Time: 296583976 [s; MET]
Trigger Stop: 296584040 [s; MET]
UTC: 2010-05-26T16:26:10.166000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 230.785345490408 Dec: 25.6390614214754 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.19
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.19
Flight Position: [ source = BAT ]
RA: 230.785345490408 Dec: 25.6390614214754 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 230.785026876271 Dec: 25.6258064253366 [deg; J2000]
{ 15h 23m 08.4s , +25d 37' 32.9" }
+/- 1.83050206151367 [arcmin] (estimated 90% radius based on SNR)
+/- 1.04997062086037 [arcmin] (formal 1-sigma fit error)
SNR: 12.8238391612435
Angular difference between Flight and Ground position is 0.795487 arcmin
Partial Coding Fraction: 0.2695312 [ including projection effects ]
Duration
T90: 104.067999958992 +/- 10.2695482178003
Measured from: -26.2719998955727
to: 77.7960000634193 [s; relative to TRIGTIME]
T50: 73.5359999537468 +/- 15.6412220515168
Measured from: -9.78399986028671
to: 63.7520000934601 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 69.9039999842644
to: 70.9039999842644 [s; relative to TRIGTIME]
Total Fluence
Measured from: -34.3519999980927
to: 84.1280000209808 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.379193 1.497513 1.015030 0.215265
0.114865 0.119318 0.104817 0.090023 [error]
Peak 0.029460 0.036601 0.017370 0.014972
0.010918 0.011281 0.010261 0.008204 [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 4.89e-07 7.29e-07 8.13e-07 1.71e-06 2.55e-06 3.74e-06 erg/cm2
Error 6.71e-08 6.18e-08 1.08e-07 4.76e-07 2.47e-07 5.71e-07 erg/cm2
Peak flux Power-law 2.78e-01 2.46e-01 1.49e-01 1.36e-01 7.31e-01 8.09e-01 ph/cm2/s
Error 1.58e-01 9.83e-02 7.79e-02 1.56e-01 2.91e-01 3.21e-01 ph/cm2/s
Fluence Cutoff-PL 4.88e-07 7.30e-07 8.13e-07 1.70e-06 2.55e-06 3.73e-06 erg/cm2
Error 6.71e-08 6.18e-08 1.08e-07 4.72e-07 2.47e-07 5.68e-07 erg/cm2
Peak flux Cutoff-PL 2.26e-01 2.96e-01 1.58e-01 2.85e-02 7.09e-01 0.00e+00 ph/cm2/s
Error 1.74e-01 1.34e-01 1.30e-01 3.07e-01 0.00e+00 0.00e+00 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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 Band 2.35e-01 7.24e-01 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 3.08e-01 0.00e+00 0.00e+00 0.00e+00 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 1.843 0.164 - - 2.34e-03 2.24e-04 67.440 57
CPL 2.009 0.000 4.3 0.0 1.88e-03 0.00e+00 67.040 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.724 0.648 - - 5.45e-03 2.34e-03 66.130 57
CPL 0.050 1.107 52.6 0.0 4.50e-02 1.52e+01 64.880 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: 99.392000 sec.
T50 in the 50-300 keV band: 56.384000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 118.480 -34.352 84.128
T90 104.068 -26.272 77.796
T50 73.536 -9.784 63.752
Peak 1.000 69.904 70.904
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
230.7850 +25.6258 0.0150 40.9 31.8 3.2266 12.8 TRIG_00423181
------------------------------------------
Foreground time interval of the image:
-34.352 71.301 (delta_t = 105.653 [sec])
Background time interval of the image:
-239.000 -237.510 (delta_t = 1.490 [sec])
-236.000 -34.352 (delta_t = 201.648 [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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -34.352 sec. to 84.128 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84289 ( -0.160884 0.166115 )
Norm@50keV : 2.33846E-03 ( -0.000225765 0.000221453 )
------------------------------------------------------------
# Chi-Squared = 67.44 using 59 PHA bins.
# Reduced chi-squared = 1.183 for 57 degrees of freedom
# Null hypothesis probability = 1.621638e-01
Photon flux (15-150 keV) in 118.5 sec: 0.327749 ( -0.0283185 0.0284023 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.54822e-06 ( -2.45486e-07 2.47813e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -34.352 sec. to 84.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.00940 ( )
Epeak [keV] : 4.29450 ( )
Norm@50keV : 1.87977E-03 ( )
------------------------------------------------------------
# Chi-Squared = 67.04 using 59 PHA bins.
# Reduced chi-squared = 1.197 for 56 degrees of freedom
# Null hypothesis probability = 1.483348e-01
Photon flux (15-150 keV) in 118.5 sec: 0.327613 ( -0.028308 0.028391 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.54831e-06 ( -2.45532e-07 2.47878e-07 ) ergs/cm2
Band function
Time interval is from -34.352 sec. to 84.128 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.55759 ( 1.55759 1.55759 )
beta : -1.84288 ( -0.166288 0.16083 )
Epeak [keV] : 9.02437 ( -9.02437 -9.02437 )
Norm@50keV : 5.74545E-03 ( -0.00574545 2218.22 )
------------------------------------------------------------
# Chi-Squared = 67.44 using 59 PHA bins.
# Reduced chi-squared = 1.226 for 55 degrees of freedom
# Null hypothesis probability = 1.210719e-01
Photon flux (15-150 keV) in 118.5 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.2927 ( )
R^2/D10^2 : 6.77595E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 123.13 using 59 PHA bins.
# Reduced chi-squared = 2.1602 for 57 degrees of freedom
# Null hypothesis probability = 9.078690e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.571e-07 4.361e-08
25- 50 8.319e-07 9.284e-08
50-150 7.679e-07 1.461e-07
15-150 1.857e-06 1.979e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.7508 (-24.8319 60.8656)
Norm : 1.42715 (-0.188229 0.182009)
------------------------------------------------------------
# Chi-Squared = 72.14 using 59 PHA bins.
# Reduced chi-squared = 1.266 for 57 degrees of freedom
# Null hypothesis probability = 8.530288e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.420e-07 6.358e-08
25- 50 7.639e-07 7.874e-08
50-150 1.236e-06 4.364e-07
15-150 2.442e-06 4.740e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.85586 (-0.972173 1.23595)
R1^2/D10^2 : 1.78441 (-1.08398 3.1243)
kT2 [keV] : 22.0631 (-4.03395 6.28483)
R2^2/D10^2 : 6.59460E-03 (-0.00391078 0.00738433)
------------------------------------------------------------
# Chi-Squared = 66.89 using 59 PHA bins.
# Reduced chi-squared = 1.216 for 55 degrees of freedom
# Null hypothesis probability = 1.306725e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.271e-07 2.000e-07
25- 50 6.498e-07 1.903e-07
50-150 1.364e-06 6.426e-07
15-150 2.541e-06 7.698e-07
Peak spectrum fit
Power-law model
Time interval is from 69.904 sec. to 70.904 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72419 ( -0.610843 0.685918 )
Norm@50keV : 5.45495E-03 ( -0.00237926 0.00230456 )
------------------------------------------------------------
# Chi-Squared = 66.13 using 59 PHA bins.
# Reduced chi-squared = 1.160 for 57 degrees of freedom
# Null hypothesis probability = 1.907093e-01
Photon flux (15-150 keV) in 1 sec: 0.730839 ( -0.290308 0.291299 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.04432e-08 ( -2.17831e-08 2.27446e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 69.904 sec. to 70.904 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.99667E-02 ( -0.0491072 2.16509 )
Epeak [keV] : 52.6377 ( -52.6374 -52.6374 )
Norm@50keV : 4.50305E-02 ( -0.0450686 30.4086 )
------------------------------------------------------------
# Chi-Squared = 64.88 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 56 degrees of freedom
# Null hypothesis probability = 1.947747e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 69.904 sec. to 70.904 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99965 ( -5445.96 -5441.19 )
beta : -2.06975 ( -3.60647 0.767324 )
Epeak [keV] : 27.0328 ( -27.032 21.4944 )
Norm@50keV : 484.358 ( -484.643 4.73765e+06 )
------------------------------------------------------------
# Chi-Squared = 64.46 using 59 PHA bins.
# Reduced chi-squared = 1.172 for 55 degrees of freedom
# Null hypothesis probability = 1.794979e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.3237 (-4.59055 7.06413)
R^2/D10^2 : 0.173402 (-0.141828 0.770061)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 65.40 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 57 degrees of freedom
# Null hypothesis probability = 2.081325e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.580e-09 3.575e-09
25- 50 1.811e-08 1.116e-08
50-150 1.683e-08 1.240e-08
15-150 4.052e-08 2.662e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.9034 (-99.936 -99.936)
Norm : 3.32819 (-1.44093 2.26744)
------------------------------------------------------------
# Chi-Squared = 65.45 using 59 PHA bins.
# Reduced chi-squared = 1.148 for 57 degrees of freedom
# Null hypothesis probability = 2.068523e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.699e-09 5.595e-09
25- 50 1.504e-08 9.685e-09
50-150 2.436e-08 2.002e-08
15-150 4.810e-08 3.451e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 19.1765 ( )
R1^2/D10^2 : 2.10030E-02 (-0.0266077 0.709207)
kT2 [keV] : 7.37913 (-6.91682 -6.91682)
R2^2/D10^2 : 0.645055 (-0.722026 -0.722026)
------------------------------------------------------------
# Chi-Squared = 64.73 using 59 PHA bins.
# Chi-Squared = 64.71 using 59 PHA bins.
# Reduced chi-squared = 1.177 for 55 degrees of freedom
# Reduced chi-squared = 1.177 for 55 degrees of freedom
# Null hypothesis probability = 1.733963e-01
# Null hypothesis probability = 1.737738e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.561e-09 4.755e-09
25- 50 1.665e-08 1.047e-08
50-150 2.123e-08 1.518e-08
15-150 4.544e-08 2.862e-08
Plot creation:
Thu May 27 13:40:51 EDT 2010