batgrbproduct Analysis for Trigger=420398
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 v2.45
Process Start Time (local time): Mon Apr 26 11:24:40 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger420398/GCN5_download_cron
======================================================================
Trigger: 00420398 Segment: 000
BAT Trigger Time: 293856650.816 [s; MET]
Trigger Stop: 293856651.84 [s; MET]
UTC: 2010-04-25T02:50:45.077880 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 299.186579434482 Dec: -26.4412771886309 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.39
Image Trigger?: NO
Rate S/N Ratio: 14.247806848775 [ if not an image trigger ]
Image S/N Ratio: 9.39
Flight Position: [ source = BAT ]
RA: 299.186579434482 Dec: -26.4412771886309 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 299.161023488516 Dec: -26.466137184161 [deg; J2000]
{ 19h 56m 38.6s , -26d 27' 58.1" }
+/- 2.20427464383886 [arcmin] (estimated 90% radius based on SNR)
+/- 1.28035008286074 [arcmin] (formal 1-sigma fit error)
SNR: 9.83419468238931
Angular difference between Flight and Ground position is 2.027182 arcmin
Partial Coding Fraction: 0.484375 [ including projection effects ]
Duration
T90: 41.1999999880791 +/- 3.77353995290746
Measured from: -0.295999884605408
to: 40.9040001034737 [s; relative to TRIGTIME]
T50: 25.1279999613762 +/- 18.2475093908099
Measured from: 0.484000146389008
to: 25.6120001077652 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.272000014781952
to: 1.27200001478195 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.06400001049042
to: 43.244000017643 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.420217 0.499235 0.112542 0.074630
0.056973 0.054248 0.046947 0.042138 [error]
Peak 0.063213 0.072527 0.015076 0.018333
0.009980 0.009343 0.007564 0.006432 [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 1.59e-07 1.68e-07 1.27e-07 1.55e-07 5.13e-07 6.09e-07 erg/cm2
Error 2.85e-08 2.67e-08 3.92e-08 9.07e-08 9.17e-08 1.46e-07 erg/cm2
Peak flux Power-law 7.00e-01 4.37e-01 1.76e-01 9.53e-02 1.36e+00 1.41e+00 ph/cm2/s
Error 1.45e-01 7.63e-02 5.48e-02 5.35e-02 2.26e-01 2.36e-01 ph/cm2/s
Fluence Cutoff-PL 1.47e-07 1.96e-07 9.78e-08 1.39e-08 4.53e-07 4.55e-07 erg/cm2
Error 3.22e-08 3.83e-08 5.16e-08 6.63e-08 9.25e-08 1.17e-07 erg/cm2
Peak flux Cutoff-PL 6.32e-01 5.71e-01 1.09e-01 2.25e-03 1.31e+00 1.31e+00 ph/cm2/s
Error 1.66e-01 1.18e-01 6.95e-02 1.36e-02 2.22e-01 2.22e-01 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 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 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 2.409 0.304 - - 1.16e-03 2.63e-04 56.990 57
CPL 0.847 1.670 26.6 0.0 1.11e-02 0.00e+00 53.780 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.315 0.311 - - 7.72e-03 1.86e-03 56.020 57
CPL -0.351 2.407 30.2 5.9 4.13e-01 2.02e+01 49.440 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 45.308 -2.064 43.244
T90 41.200 -0.296 40.904
T50 25.128 0.484 25.612
Peak 1.000 0.272 1.272
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
299.1610 -26.4661 0.0196 28.5 -83.3 0.7205 9.8 TRIG_00420398
------------------------------------------
Foreground time interval of the image:
-2.064 17.385 (delta_t = 19.449 [sec])
Background time interval of the image:
-239.816 -56.806 (delta_t = 183.010 [sec])
-55.816 -2.064 (delta_t = 53.752 [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 -2.064 sec. to 43.244 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.40865 ( -0.286329 0.320822 )
Norm@50keV : 1.15848E-03 ( -0.000264633 0.000261063 )
------------------------------------------------------------
# Chi-Squared = 56.99 using 59 PHA bins.
# Reduced chi-squared = 0.9998 for 57 degrees of freedom
# Null hypothesis probability = 4.754633e-01
Photon flux (15-150 keV) in 45.31 sec: 0.215442 ( -0.0307535 0.0307536 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.13059e-07 ( -8.96621e-08 9.37006e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.064 sec. to 43.244 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.846717 ( -2.1896 1.15 )
Epeak [keV] : 26.5897 ( )
Norm@50keV : 1.10694E-02 ( )
------------------------------------------------------------
# Chi-Squared = 53.78 using 59 PHA bins.
# Reduced chi-squared = 0.9603 for 56 degrees of freedom
# Null hypothesis probability = 5.594739e-01
Photon flux (15-150 keV) in 45.31 sec: 0.206442 ( -0.031382 0.031589 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.53245e-07 ( -8.33595e-08 1.01739e-07 ) ergs/cm2
Band function
Time interval is from -2.064 sec. to 43.244 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.904757 ( -1.28868 1.42578 )
beta : -9.37166 ( 10 20 )
Epeak [keV] : 26.3792 ( -8.16609 9.09198 )
Norm@50keV : 1.01202E-02 ( -0.0101223 0.101282 )
------------------------------------------------------------
# Chi-Squared = 53.78 using 59 PHA bins.
# Reduced chi-squared = 0.9778 for 55 degrees of freedom
# Null hypothesis probability = 5.212755e-01
Photon flux (15-150 keV) in 45.31 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] : 7.92308 (-1.09591 1.26009)
R^2/D10^2 : 0.248103 (-0.112677 0.208925)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 57.05 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 57 degrees of freedom
# Null hypothesis probability = 4.732964e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.267e-07 3.328e-08
25- 50 2.180e-07 5.070e-08
50-150 5.545e-08 2.511e-08
15-150 4.002e-07 8.706e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 35.3694 (-10.1147 16.0992)
Norm : 1.52578 (-0.38336 0.543268)
------------------------------------------------------------
# Chi-Squared = 54.02 using 59 PHA bins.
# Reduced chi-squared = 0.9478 for 57 degrees of freedom
# Null hypothesis probability = 5.874451e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.517e-07 2.972e-08
25- 50 1.887e-07 3.743e-08
50-150 1.269e-07 6.044e-08
15-150 4.672e-07 1.052e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.93217 (-1.70477 4.00376)
R1^2/D10^2 : 125.495 (-330.395 -336.375)
kT2 [keV] : 8.92073 (-1.42112 3.45231)
R2^2/D10^2 : 0.141040 (-0.125313 0.165493)
------------------------------------------------------------
# Chi-Squared = 52.19 using 59 PHA bins.
# Reduced chi-squared = 0.9489 for 55 degrees of freedom
# Null hypothesis probability = 5.827100e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.370e-07 6.224e-08
25- 50 2.075e-07 9.784e-08
50-150 7.670e-08 4.514e-08
15-150 4.211e-07 1.830e-07
Peak spectrum fit
Power-law model
Time interval is from 0.272 sec. to 1.272 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.31529 ( -0.294864 0.327737 )
Norm@50keV : 7.72472E-03 ( -0.00187614 0.00185228 )
------------------------------------------------------------
# Chi-Squared = 56.02 using 59 PHA bins.
# Reduced chi-squared = 0.9828 for 57 degrees of freedom
# Null hypothesis probability = 5.118189e-01
Photon flux (15-150 keV) in 1 sec: 1.36151 ( -0.225752 0.225762 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.40269e-08 ( -1.47096e-08 1.5311e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.272 sec. to 1.272 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.350651 ( -2.90357 1.90962 )
Epeak [keV] : 30.2053 ( -5.75714 6.03567 )
Norm@50keV : 0.413165 ( -0.562362 39.9062 )
------------------------------------------------------------
# Chi-Squared = 49.44 using 59 PHA bins.
# Reduced chi-squared = 0.8829 for 56 degrees of freedom
# Null hypothesis probability = 7.196541e-01
Photon flux (15-150 keV) in 1 sec: 1.31454 ( -0.2214 0.22214 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.2236e-08 ( -1.16074e-08 1.34547e-08 ) ergs/cm2
Band function
Time interval is from 0.272 sec. to 1.272 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.709072 ( -1.69013 -0.208916 )
beta : -4.39584 ( 4.65312 13.5352 )
Epeak [keV] : 30.1987 ( -6.52796 6.42761 )
Norm@50keV : 0.722657 ( -0.698794 301.184 )
------------------------------------------------------------
# Chi-Squared = 49.36 using 59 PHA bins.
# Reduced chi-squared = 0.8974 for 55 degrees of freedom
# Null hypothesis probability = 6.891427e-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] : 7.96550 (-1.11908 1.29295)
R^2/D10^2 : 1.64298 (-0.762282 1.4028)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 49.89 using 59 PHA bins.
# Reduced chi-squared = 0.8753 for 57 degrees of freedom
# Null hypothesis probability = 7.364979e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.879e-08 4.985e-09
25- 50 3.264e-08 7.935e-09
50-150 8.449e-09 3.962e-09
15-150 5.988e-08 1.310e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 36.6617 (-10.986 18.6795)
Norm : 9.61698 (-2.57555 3.55211)
------------------------------------------------------------
# Chi-Squared = 51.82 using 59 PHA bins.
# Reduced chi-squared = 0.9092 for 57 degrees of freedom
# Null hypothesis probability = 6.691235e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.140e-08 4.330e-09
25- 50 2.708e-08 6.610e-09
50-150 1.899e-08 1.021e-08
15-150 6.747e-08 1.604e-08
Double BB
R1^2/D10^2 : 4.16429E-05 ( )
kT2 [keV] : 7.74660 (-7.74636 1.27426)
R2^2/D10^2 : 1.80170 (-0.964013 1.65897)
------------------------------------------------------------
# Chi-Squared = 49.32 using 59 PHA bins.
# Chi-Squared = 48.95 using 59 PHA bins.
# Chi-Squared = 48.73 using 59 PHA bins.
# Reduced chi-squared = 0.8967 for 55 degrees of freedom
# Reduced chi-squared = 0.8900 for 55 degrees of freedom
# Reduced chi-squared = 0.8860 for 55 degrees of freedom
# Null hypothesis probability = 6.904762e-01
# Null hypothesis probability = 7.038464e-01
# Null hypothesis probability = 7.115912e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.973e-08 1.025e-08
25- 50 3.143e-08 1.785e-08
50-150 1.030e-08 6.410e-09
15-150 6.146e-08 3.336e-08
Plot creation:
Mon Apr 26 11:50:41 EDT 2010