batgrbproduct Analysis for Trigger=419932
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): Thu Apr 22 21:08:33 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger419932/SDC
======================================================================
Trigger: 00419932 Segment: 000
BAT Trigger Time: 293433768 [s; MET]
Trigger Stop: 293433844 [s; MET]
UTC: 2010-04-20T05:22:42.276700 [includes UTCF correction]
Where From?: Command line
BAT
RA: 296.127555899969 Dec: 55.7926334166084 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.37
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.37
Flight Position: [ source = BAT ]
RA: 296.127555899969 Dec: 55.7926334166084 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 295.934043912031 Dec: 55.9623583283087 [deg; J2000]
{ 19h 43m 44.2s , +55d 57' 44.5" }
+/- 4.57745715205943 [arcmin] (estimated 90% radius based on SNR)
+/- 3.05823869583591 [arcmin] (formal 1-sigma fit error)
SNR: 3.46233748398066
Angular difference between Flight and Ground position is 12.088219 arcmin
Partial Coding Fraction: 0.921875 [ including projection effects ]
Duration
T90: 48 +/- 35.7770876399966
Measured from: 1
to: 49 [s; relative to TRIGTIME]
T50: 32 +/- 16
Measured from: 1
to: 33 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.5
to: 9.5 [s; relative to TRIGTIME]
Total Fluence
Measured from: 1
to: 65 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.189227 0.312467 0.163031 0.048121
0.045741 0.045949 0.042133 0.040486 [error]
Peak 0.062969 0.075451 0.087189 0.029888
0.022931 0.023036 0.021415 0.020492 [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 5.66e-08 1.08e-07 1.60e-07 5.06e-07 4.51e-07 8.30e-07 erg/cm2
Error 1.67e-08 2.02e-08 4.02e-08 2.72e-07 9.79e-08 3.06e-07 erg/cm2
Peak flux Power-law 3.17e-02 4.01e-02 3.69e-02 5.96e-02 1.29e-01 1.68e-01 ph/cm2/s
Error 4.85e-02 4.22e-02 3.87e-02 3.39e-01 1.29e-01 3.46e-01 ph/cm2/s
Fluence Cutoff-PL 5.16e-08 1.17e-07 1.62e-07 1.71e-07 4.19e-07 5.02e-07 erg/cm2
Error 1.90e-08 2.66e-08 4.58e-08 3.38e-07 1.10e-07 3.89e-07 erg/cm2
Peak flux Cutoff-PL 2.68e-02 4.40e-02 4.03e-02 2.30e-02 1.26e-01 1.34e-01 ph/cm2/s
Error 4.76e-02 5.58e-02 4.63e-02 3.57e-01 1.27e-01 2.16e-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 2.63e-02 1.46e-01 1.38e-01 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 1.437 0.319 - - 7.35e-04 1.41e-04 88.500 57
CPL 0.720 1.330 83.5 0.0 1.77e-03 0.00e+00 87.520 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.115 1.978 - - 1.11e-03 1.10e-03 52.760 57
CPL 0.133 0.000 96.5 0.0 3.44e-03 8.09e+00 52.630 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 64.000 1.000 65.000
T90 48.000 1.000 49.000
T50 32.000 1.000 33.000
Peak 1.000 8.500 9.500
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
295.9340 +55.9624 0.0557 16.0 140.9 0.9773 3.5 TRIG_00419932
------------------------------------------
Foreground time interval of the image:
1.000 65.000 (delta_t = 64.000 [sec])
Background time interval of the image:
-6.299 1.000 (delta_t = 7.299 [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 1.000 sec. to 65.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43725 ( -0.31597 0.321782 )
Norm@50keV : 7.34699E-04 ( -0.000142019 0.000139978 )
------------------------------------------------------------
# Chi-Squared = 88.50 using 59 PHA bins.
# Reduced chi-squared = 1.553 for 57 degrees of freedom
# Null hypothesis probability = 4.741462e-03
Photon flux (15-150 keV) in 64 sec: 9.02604E-02 ( -0.0165077 0.0165175 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.51035e-07 ( -9.63277e-08 9.93862e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.000 sec. to 65.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.720374 ( -1.69194 0.968361 )
Epeak [keV] : 83.4834 ( )
Norm@50keV : 1.76981E-03 ( )
------------------------------------------------------------
# Chi-Squared = 87.52 using 59 PHA bins.
# Reduced chi-squared = 1.563 for 56 degrees of freedom
# Null hypothesis probability = 4.492088e-03
Photon flux (15-150 keV) in 64 sec: 8.74990E-02 ( -0.017186 0.01712 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.18992e-07 ( -1.08715e-07 1.11787e-07 ) ergs/cm2
Band function
Time interval is from 1.000 sec. to 65.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.24834 ( -2.13082 -2.13082 )
beta : -1.73940 ( 1.73963 0.496755 )
Epeak [keV] : 35.9251 ( -35.9248 89.1375 )
Norm@50keV : 0.202801 ( -0.202868 8.98726 )
------------------------------------------------------------
# Chi-Squared = 86.94 using 59 PHA bins.
# Reduced chi-squared = 1.581 for 55 degrees of freedom
# Null hypothesis probability = 3.904495e-03
Photon flux (15-150 keV) in 64 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] : 13.8207 (-2.91864 3.97944)
R^2/D10^2 : 1.38367E-02 (-0.00807918 0.0179316)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 91.76 using 59 PHA bins.
# Reduced chi-squared = 1.610 for 57 degrees of freedom
# Null hypothesis probability = 2.399485e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.577e-08 1.427e-08
25- 50 1.313e-07 4.176e-08
50-150 1.641e-07 7.066e-08
15-150 3.312e-07 1.050e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.359 (-199.918 -199.918)
Norm : 0.369799 (-0.0671942 0.0672517)
------------------------------------------------------------
# Chi-Squared = 88.13 using 59 PHA bins.
# Reduced chi-squared = 1.546 for 57 degrees of freedom
# Null hypothesis probability = 5.113347e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.893e-08 3.232e-08
25- 50 1.134e-07 6.301e-08
50-150 2.486e-07 1.400e-07
15-150 4.209e-07 2.364e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.40317 (-4.12408 4.56197)
R1^2/D10^2 : 5.23264E-02 (-0.0378305 0.334068)
kT2 [keV] : 29.3101 (-24.0782 -29.3187)
R2^2/D10^2 : 7.25110E-04 (-0.000713853 0.00749014)
------------------------------------------------------------
# Chi-Squared = 86.70 using 59 PHA bins.
# Reduced chi-squared = 1.576 for 55 degrees of freedom
# Null hypothesis probability = 4.105932e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.057e-08 2.934e-08
25- 50 1.228e-07 6.662e-08
50-150 2.625e-07 1.596e-07
15-150 4.359e-07 2.549e-07
Peak spectrum fit
Power-law model
Time interval is from 8.500 sec. to 9.500 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11462 ( -1.11813 2.83809 )
Norm@50keV : 1.10975E-03 ( -0.00110977 0.00109008 )
------------------------------------------------------------
# Chi-Squared = 52.76 using 59 PHA bins.
# Reduced chi-squared = 0.9256 for 57 degrees of freedom
# Null hypothesis probability = 6.348749e-01
Photon flux (15-150 keV) in 1 sec: 0.128955 ( -0.128955 0.129094 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15394e-08 ( -1.15392e-08 1.29773e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.500 sec. to 9.500 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.133162 ( -0.140295 -0.140295 )
Epeak [keV] : 96.4997 ( -97.1884 -97.1884 )
Norm@50keV : 3.44339E-03 ( -0.00337938 16.1755 )
------------------------------------------------------------
# Chi-Squared = 52.63 using 59 PHA bins.
# Reduced chi-squared = 0.9398 for 56 degrees of freedom
# Null hypothesis probability = 6.033504e-01
Photon flux (15-150 keV) in 1 sec: 0.125599 ( -0.125599 0.129346 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07849e-08 ( -1.07849e-08 1.33875e-08 ) ergs/cm2
Band function
Time interval is from 8.500 sec. to 9.500 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.03992E-02 ( -1.8431 0.565525 )
beta : -10.00000 ( 3.41278e+11 3.41278e+11 )
Epeak [keV] : 92.3139 ( -84.2177 -96.2342 )
Norm@50keV : 3.69572E-03 ( -0.00340491 13.6314 )
------------------------------------------------------------
# Chi-Squared = 52.63 using 59 PHA bins.
# Reduced chi-squared = 0.9569 for 55 degrees of freedom
# Null hypothesis probability = 5.657809e-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] : 20.4746 (-20.5288 -20.5288)
R^2/D10^2 : 5.68547E-03 (-0.00564356 1.71407)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 52.83 using 59 PHA bins.
# Reduced chi-squared = 0.9268 for 57 degrees of freedom
# Null hypothesis probability = 6.322273e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.551e-10 4.321e-10
25- 50 2.302e-09 1.937e-09
50-150 7.175e-09 6.300e-09
15-150 9.932e-09 8.480e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.966 -199.966)
Norm : 0.526527 (-0.526685 0.530158)
------------------------------------------------------------
# Chi-Squared = 52.89 using 59 PHA bins.
# Reduced chi-squared = 0.9279 for 57 degrees of freedom
# Null hypothesis probability = 6.299326e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.311e-09 1.032e-09
25- 50 2.522e-09 2.219e-09
50-150 5.531e-09 4.641e-09
15-150 9.365e-09 8.240e-09
Double BB
R1^2/D10^2 : 8.46120E-02 ( )
kT2 [keV] : 32.5268 (-32.6812 -32.6812)
R2^2/D10^2 : 9.98102E-04 (-0.000979812 4.8336)
------------------------------------------------------------
# Chi-Squared = 52.83 using 59 PHA bins.
# Chi-Squared = 52.41 using 59 PHA bins.
# Chi-Squared = 52.36 using 59 PHA bins.
# Reduced chi-squared = 0.9605 for 55 degrees of freedom
# Reduced chi-squared = 0.9530 for 55 degrees of freedom
# Reduced chi-squared = 0.9520 for 55 degrees of freedom
# Null hypothesis probability = 5.580289e-01
# Null hypothesis probability = 5.741018e-01
# Null hypothesis probability = 5.760384e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Fri Apr 23 00:05:37 EDT 2010