batgrbproduct Analysis for Trigger=458918
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 batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Mon Aug 8 09:15:01 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger458918/SDC
======================================================================
Trigger: 00458918 Segment: 000
BAT Trigger Time: 334477141.44 [s; MET]
Trigger Stop: 334477149.632 [s; MET]
UTC: 2011-08-08T06:18:54.201560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 57.2642206519533 Dec: -44.1786208592457 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.19
Image Trigger?: NO
Rate S/N Ratio: 10 [ if not an image trigger ]
Image S/N Ratio: 7.19
Flight Position: [ source = BAT ]
RA: 57.2642206519533 Dec: -44.1786208592457 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 57.3215383401265 Dec: -44.1765094016388 [deg; J2000]
{ 03h 49m 17.2s , -44d 10' 35.4" }
+/- 2.68212898431237 [arcmin] (estimated 90% radius based on SNR)
+/- 1.64126825104893 [arcmin] (formal 1-sigma fit error)
SNR: 7.43026975246166
Angular difference between Flight and Ground position is 2.469690 arcmin
Partial Coding Fraction: 0.765625 [ including projection effects ]
Duration
T90: 48 +/- 22.6274169979695
Measured from: -7.43999999761581
to: 40.5600000023842 [s; relative to TRIGTIME]
T50: 32 +/- 16
Measured from: -7.43999999761581
to: 24.5600000023842 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0600000023841858
to: 1.06000000238419 [s; relative to TRIGTIME]
Total Fluence
Measured from: -7.43999999761581
to: 40.5600000023842 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.279340 0.282943 0.094353 0.030043
0.048262 0.047631 0.042126 0.038380 [error]
Peak 0.015779 0.013651 0.018479 0.005514
0.007128 0.007315 0.006123 0.005533 [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 9.44e-08 1.06e-07 8.48e-08 1.13e-07 3.27e-07 3.98e-07 erg/cm2
Error 2.31e-08 2.35e-08 3.69e-08 9.51e-08 8.49e-08 1.45e-07 erg/cm2
Peak flux Power-law 1.36e-01 1.28e-01 8.37e-02 8.46e-02 3.82e-01 4.32e-01 ph/cm2/s
Error 9.33e-02 5.85e-02 4.95e-02 1.12e-01 1.71e-01 1.94e-01 ph/cm2/s
Fluence Cutoff-PL 9.36e-08 1.09e-07 8.08e-08 5.91e-08 3.15e-07 3.43e-07 erg/cm2
Error 2.39e-08 2.95e-08 6.15e-08 1.14e-07 9.61e-08 1.68e-07 erg/cm2
Peak flux Cutoff-PL 1.00e-01 1.43e-01 9.57e-02 2.83e-02 3.60e-01 3.67e-01 ph/cm2/s
Error 1.14e-01 1.09e-01 8.22e-02 1.02e-01 1.76e-01 3.04e-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 3.81e-01 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 2.320 0.433 - - 7.09e-04 2.26e-04 58.600 57
CPL 1.854 0.000 11.5 0.0 1.39e-03 0.00e+00 58.530 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.614 0.826 - - 2.96e-03 1.42e-03 56.550 57
CPL 0.168 1.113 65.8 0.0 1.50e-02 0.00e+00 56.060 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 48.000 -7.440 40.560
T90 48.000 -7.440 40.560
T50 32.000 -7.440 24.560
Peak 1.000 0.060 1.060
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
57.3215 -44.1765 0.0258 29.3 170.3 0.7435 7.4 TRIG_00458918
------------------------------------------
Foreground time interval of the image:
-7.440 40.560 (delta_t = 48.000 [sec])
Background time interval of the image:
-239.440 -7.440 (delta_t = 232.000 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) 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.
- 5) 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.
- 6) 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 -7.440 sec. to 40.560 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.31972 ( -0.397172 0.468216 )
Norm@50keV : 7.09237E-04 ( -0.000229431 0.00022337 )
------------------------------------------------------------
# Chi-Squared = 58.60 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 57 degrees of freedom
# Null hypothesis probability = 4.165098e-01
Photon flux (15-150 keV) in 48 sec: 0.125320 ( -0.0245453 0.0245561 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.26534e-07 ( -8.21434e-08 8.77214e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -7.440 sec. to 40.560 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85395 ( )
Epeak [keV] : 11.4849 ( )
Norm@50keV : 1.39213E-03 ( )
------------------------------------------------------------
# Chi-Squared = 58.53 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 56 degrees of freedom
# Null hypothesis probability = 3.826794e-01
Photon flux (15-150 keV) in 48 sec: 0.124194 ( -0.0244099 0.025093 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.14732e-07 ( -9.42898e-08 9.78802e-08 ) ergs/cm2
Band function
Time interval is from -7.440 sec. to 40.560 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.95159 ( 1.89302 0.283445 )
beta : -9.37167 ( 9.99993 19.9999 )
Epeak [keV] : 4.83363 ( -4.67086 -8.0661 )
Norm@50keV : 1.20736E-03 ( -0.000458311 0.00068676 )
------------------------------------------------------------
# Chi-Squared = 58.51 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 55 degrees of freedom
# Null hypothesis probability = 3.479484e-01
Photon flux (15-150 keV) in 48 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] : 7.10230 (-1.5003 1.95902)
R^2/D10^2 : 0.219691 (-0.137884 0.369208)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 62.79 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 57 degrees of freedom
# Null hypothesis probability = 2.786582e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.673e-08 3.877e-08
25- 50 1.221e-07 4.873e-08
50-150 2.132e-08 1.450e-08
15-150 2.302e-07 9.919e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 37.8906 (-15.9178 34.9227)
Norm : 0.839771 (-0.279082 0.502038)
------------------------------------------------------------
# Chi-Squared = 58.87 using 59 PHA bins.
# Reduced chi-squared = 1.033 for 57 degrees of freedom
# Null hypothesis probability = 4.067756e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.082e-08 2.527e-08
25- 50 1.167e-07 3.506e-08
50-150 8.496e-08 5.171e-08
15-150 2.924e-07 1.071e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.51841 (-3.39983 2.2171)
R1^2/D10^2 : 0.520075 ( )
kT2 [keV] : 21.5373 (-19.051 -21.5331)
R2^2/D10^2 : 1.55389E-03 (-0.0015512 0.0877746)
------------------------------------------------------------
# Chi-Squared = 58.36 using 59 PHA bins.
# Chi-Squared = 58.11 using 59 PHA bins.
# Reduced chi-squared = 1.061 for 55 degrees of freedom
# Reduced chi-squared = 1.057 for 55 degrees of freedom
# Null hypothesis probability = 3.530749e-01
# Null hypothesis probability = 3.613788e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.397e-08 5.628e-08
25- 50 1.008e-07 5.556e-08
50-150 1.010e-07 6.914e-08
15-150 2.958e-07 1.591e-07
Peak spectrum fit
Power-law model
Time interval is from 0.060 sec. to 1.060 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61382 ( -0.766872 0.884128 )
Norm@50keV : 2.96364E-03 ( -0.00146842 0.00137735 )
------------------------------------------------------------
# Chi-Squared = 56.55 using 59 PHA bins.
# Reduced chi-squared = 0.9922 for 57 degrees of freedom
# Null hypothesis probability = 4.917420e-01
Photon flux (15-150 keV) in 1 sec: 0.382490 ( -0.170236 0.17088 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.76704e-08 ( -1.36096e-08 1.42575e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.060 sec. to 1.060 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.167956 ( -0.164637 2.06053 )
Epeak [keV] : 65.7977 ( )
Norm@50keV : 1.49763E-02 ( )
------------------------------------------------------------
# Chi-Squared = 56.06 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 56 degrees of freedom
# Null hypothesis probability = 4.726677e-01
Photon flux (15-150 keV) in 1 sec: 0.360437 ( -0.172682 0.179956 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.60768e-08 ( -1.26551e-08 1.46555e-08 ) ergs/cm2
Band function
Time interval is from 0.060 sec. to 1.060 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.205609 ( 0.559578 0.559578 )
beta : -10.00000 ( 1.2108e+10 1.2108e+10 )
Epeak [keV] : 66.1465 ( -61.1719 -65.8886 )
Norm@50keV : 1.43843E-02 ( -0.0151153 3.24271 )
------------------------------------------------------------
# Chi-Squared = 56.06 using 59 PHA bins.
# Reduced chi-squared = 1.019 for 55 degrees of freedom
# Null hypothesis probability = 4.349267e-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] : 15.6655 (-5.68736 9.52681)
R^2/D10^2 : 3.90151E-02 (-0.0390146 0.147824)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 56.24 using 59 PHA bins.
# Reduced chi-squared = 0.9866 for 57 degrees of freedom
# Null hypothesis probability = 5.036889e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.989e-09 1.311e-09
25- 50 8.216e-09 5.270e-09
50-150 1.398e-08 1.013e-08
15-150 2.418e-08 1.641e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 182.126 ( )
Norm : 1.56943 (-0.70393 1.18154)
------------------------------------------------------------
# Chi-Squared = 56.34 using 59 PHA bins.
# Reduced chi-squared = 0.9884 for 57 degrees of freedom
# Null hypothesis probability = 4.999035e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.896e-09 2.483e-09
25- 50 7.483e-09 4.760e-09
50-150 1.634e-08 1.032e-08
15-150 2.772e-08 1.733e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.18877 (-3.14389 20.3394)
R1^2/D10^2 : 9.47560 (-14.363 77.5162)
kT2 [keV] : 17.7073 (-6.55111 16.435)
R2^2/D10^2 : 2.32314E-02 (-0.0250726 0.106302)
------------------------------------------------------------
# Chi-Squared = 54.99 using 59 PHA bins.
# Reduced chi-squared = 0.9999 for 55 degrees of freedom
# Null hypothesis probability = 4.748291e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.029e-09 2.205e-09
25- 50 7.156e-09 4.337e-09
50-150 1.517e-08 1.094e-08
15-150 2.636e-08 1.559e-08
Plot creation:
Mon Aug 8 09:42:06 EDT 2011