batgrbproduct Analysis for Trigger=420247
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): Sat Apr 24 06:01:21 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger420247/GCN5_download_cron
======================================================================
Trigger: 00420247 Segment: 000
BAT Trigger Time: 293675704.896 [s; MET]
Trigger Stop: 293675705.92 [s; MET]
UTC: 2010-04-23T00:34:59.164220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 136.477016071933 Dec: 21.4794761790139 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 21.49
Image Trigger?: NO
Rate S/N Ratio: 116.228223766863 [ if not an image trigger ]
Image S/N Ratio: 21.49
Flight Position: [ source = BAT ]
RA: 136.477016071933 Dec: 21.4794761790139 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 136.472703954005 Dec: 21.4805623590246 [deg; J2000]
{ 09h 05m 53.4s , +21d 28' 50.0" }
+/- 0.659559380088711 [arcmin] (estimated 90% radius based on SNR)
+/- 0.239442025991205 [arcmin] (formal 1-sigma fit error)
SNR: 55.1222698232986
Angular difference between Flight and Ground position is 0.249422 arcmin
Partial Coding Fraction: 0.7421875 [ including projection effects ]
Duration
T90: 114.991999983788 +/- 15.8193183058926
Measured from: 0.156000077724457
to: 115.148000061512 [s; relative to TRIGTIME]
T50: 47.379999935627 +/- 2.09261557873065
Measured from: 4.90000009536743
to: 52.2800000309944 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.155999958515167
to: 1.15599995851517 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.01600003242493
to: 161.867999970913 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.451022 3.753465 4.139079 1.760332
0.091992 0.100502 0.099802 0.107699 [error]
Peak 0.131916 0.260205 0.382145 0.173062
0.008402 0.010625 0.012421 0.011725 [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 6.96e-07 1.66e-06 3.15e-06 1.45e-05 8.53e-06 2.00e-05 erg/cm2
Error 4.52e-08 6.12e-08 1.01e-07 1.16e-06 2.61e-07 1.19e-06 erg/cm2
Peak flux Power-law 1.21e+00 1.95e+00 2.37e+00 5.67e+00 7.15e+00 1.12e+01 ph/cm2/s
Error 9.59e-02 9.31e-02 9.25e-02 4.93e-01 2.62e-01 5.28e-01 ph/cm2/s
Fluence Cutoff-PL 6.96e-07 1.66e-06 3.15e-06 1.44e-05 8.53e-06 1.99e-05 erg/cm2
Error 4.52e-08 6.13e-08 1.01e-07 1.15e-06 2.62e-07 1.18e-06 erg/cm2
Peak flux Cutoff-PL 1.19e+00 1.95e+00 2.39e+00 5.32e+00 7.14e+00 1.08e+01 ph/cm2/s
Error 1.16e-01 9.67e-02 1.04e-01 1.00e+00 2.60e-01 1.02e+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 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 1.077 0.056 - - 4.94e-03 1.43e-04 44.320 57
CPL 1.071 0.000 10000.0 0.0 4.97e-03 1.43e-04 44.470 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.716 0.065 - - 6.19e-02 2.32e-03 49.560 57
CPL 0.687 0.181 2685.1 0.0 6.37e-02 1.14e-02 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: 51.200000 sec.
T50 in the 50-300 keV band: 25.472000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 163.884 -2.016 161.868
T90 114.992 0.156 115.148
T50 47.380 4.900 52.280
Peak 1.000 0.156 1.156
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
136.4727 +21.4806 0.0035 32.3 179.5 12.3230 55.1 TRIG_00420247
------------------------------------------
Foreground time interval of the image:
-2.016 114.705 (delta_t = 116.721 [sec])
Background time interval of the image:
-179.896 -14.616 (delta_t = 165.280 [sec])
-13.896 -2.016 (delta_t = 11.880 [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 -2.016 sec. to 161.868 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07654 ( -0.056396 0.0559934 )
Norm@50keV : 4.94158E-03 ( -0.000142916 0.000142603 )
------------------------------------------------------------
# Chi-Squared = 44.32 using 59 PHA bins.
# Reduced chi-squared = 0.7776 for 57 degrees of freedom
# Null hypothesis probability = 8.897384e-01
Photon flux (15-150 keV) in 163.9 sec: 0.571959 ( -0.017309 0.0173823 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.5325e-06 ( -2.60837e-07 2.61953e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.016 sec. to 161.868 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07119 ( )
Epeak [keV] : 10000.00 ( )
Norm@50keV : 4.96842E-03 ( -0.000143334 0.000143048 )
------------------------------------------------------------
# Chi-Squared = 44.47 using 59 PHA bins.
# Reduced chi-squared = 0.7941 for 56 degrees of freedom
# Null hypothesis probability = 8.665879e-01
Photon flux (15-150 keV) in 163.9 sec: 0.571686 ( -0.0173 0.017375 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.53393e-06 ( -2.61011e-07 2.62043e-07 ) ergs/cm2
Band function
Time interval is from -2.016 sec. to 161.868 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.79732 ( -11.3877 -11.3877 )
beta : -1.08266 ( -0.0607923 0.0553924 )
Epeak [keV] : 21.8194 ( -21.8194 4.70563 )
Norm@50keV : 544.799 ( -39.9298 6554.82 )
------------------------------------------------------------
# Chi-Squared = 43.85 using 59 PHA bins.
# Reduced chi-squared = 0.7972 for 55 degrees of freedom
# Null hypothesis probability = 8.600371e-01
Photon flux (15-150 keV) in 163.9 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] : 22.2069 ( )
R^2/D10^2 : 1.87568E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 296.74 using 59 PHA bins.
# Reduced chi-squared = 5.2060 for 57 degrees of freedom
# Null hypothesis probability = 4.025599e-34
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.794e-07 1.680e-08
25- 50 1.485e-06 6.630e-08
50-150 5.474e-06 2.508e-07
15-150 7.239e-06 2.557e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 2.42271 ( )
------------------------------------------------------------
# Chi-Squared = 266.62 using 59 PHA bins.
# Reduced chi-squared = 4.6776 for 57 degrees of freedom
# Null hypothesis probability = 7.550609e-29
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.888e-07 5.065e-07
25- 50 1.902e-06 9.711e-07
50-150 4.172e-06 2.130e-06
15-150 7.062e-06 3.600e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.05116 (-0.853999 1.36891)
R1^2/D10^2 : 0.296551 (-0.113982 0.137892)
kT2 [keV] : 38.0418 (-3.99296 8.49199)
R2^2/D10^2 : 3.16247E-03 (-0.00136383 0.00125586)
------------------------------------------------------------
# Chi-Squared = 51.51 using 59 PHA bins.
# Reduced chi-squared = 0.9366 for 55 degrees of freedom
# Null hypothesis probability = 6.086145e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.727e-07 8.752e-08
25- 50 1.687e-06 1.533e-07
50-150 6.317e-06 1.193e-06
15-150 8.676e-06 1.463e-06
Peak spectrum fit
Power-law model
Time interval is from 0.156 sec. to 1.156 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.715802 ( -0.0655104 0.0646992 )
Norm@50keV : 6.19332E-02 ( -0.00232941 0.00231992 )
------------------------------------------------------------
# Chi-Squared = 49.56 using 59 PHA bins.
# Reduced chi-squared = 0.8695 for 57 degrees of freedom
# Null hypothesis probability = 7.474683e-01
Photon flux (15-150 keV) in 1 sec: 7.15038 ( -0.261889 0.26192 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.5064e-07 ( -3.1021e-08 3.10904e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.156 sec. to 1.156 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.687048 ( -0.27419 0.0873275 )
Epeak [keV] : 2685.05 ( -1000.24 -1000.24 )
Norm@50keV : 6.37433E-02 ( -0.00357183 0.0191961 )
------------------------------------------------------------
# Chi-Squared = 49.44 using 59 PHA bins.
# Reduced chi-squared = 0.8829 for 56 degrees of freedom
# Null hypothesis probability = 7.197546e-01
Photon flux (15-150 keV) in 1 sec: 7.13928 ( -0.25946 0.26009 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.49443e-07 ( -1.5924e-08 3.1896e-08 ) ergs/cm2
Band function
Time interval is from 0.156 sec. to 1.156 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99998 ( -92875 -92875 )
beta : -0.726349 ( -0.0660536 0.0665691 )
Epeak [keV] : 23.3081 ( -23.3076 5.56953 )
Norm@50keV : 4767.67 ( -4768.79 3.60337e+06 )
------------------------------------------------------------
# Chi-Squared = 49.20 using 59 PHA bins.
# Reduced chi-squared = 0.8946 for 55 degrees of freedom
# Null hypothesis probability = 6.946390e-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] : 26.7130 ( )
R^2/D10^2 : 0.152790 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 159.29 using 59 PHA bins.
# Reduced chi-squared = 2.7946 for 57 degrees of freedom
# Null hypothesis probability = 1.297875e-11
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.827e-08 1.325e-09
25- 50 1.070e-07 5.920e-09
50-150 5.595e-07 3.280e-08
15-150 6.848e-07 3.060e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 25.4558 ( )
------------------------------------------------------------
# Chi-Squared = 456.79 using 59 PHA bins.
# Reduced chi-squared = 8.0138 for 57 degrees of freedom
# Null hypothesis probability = 9.352261e-64
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.339e-08 3.270e-08
25- 50 1.219e-07 6.290e-08
50-150 2.674e-07 1.372e-07
15-150 4.527e-07 2.336e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.51798 (-1.52584 1.85674)
R1^2/D10^2 : 2.09732 (-0.880289 1.71473)
kT2 [keV] : 41.4125 (-5.49606 9.09351)
R2^2/D10^2 : 3.98028E-02 (-0.0166529 0.0200679)
------------------------------------------------------------
# Chi-Squared = 49.91 using 59 PHA bins.
# Reduced chi-squared = 0.9074 for 55 degrees of freedom
# Null hypothesis probability = 6.690688e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.731e-08 6.075e-09
25- 50 1.151e-07 1.341e-08
50-150 6.079e-07 6.985e-08
15-150 7.603e-07 9.015e-08
Plot creation:
Sat Apr 24 07:22:55 EDT 2010