batgrbproduct Analysis for Trigger=458448
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 1 03:18:53 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger458448/GCN5_download_cron
======================================================================
Trigger: 00458448 Segment: 000
BAT Trigger Time: 333803377.664 [s; MET]
Trigger Stop: 333803378.688 [s; MET]
UTC: 2011-07-31T11:09:30.451760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 280.521297500506 Dec: -28.5459461093081 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 24.57
Image Trigger?: NO
Rate S/N Ratio: 180.740144959552 [ if not an image trigger ]
Image S/N Ratio: 24.57
Flight Position: [ source = BAT ]
RA: 280.521297500506 Dec: -28.5459461093081 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 280.512791635534 Dec: -28.5361239550775 [deg; J2000]
{ 18h 42m 03.1s , -28d 32' 10.0" }
+/- 0.503168115584937 [arcmin] (estimated 90% radius based on SNR)
+/- 0.1549407001004 [arcmin] (formal 1-sigma fit error)
SNR: 81.1414013573412
Angular difference between Flight and Ground position is 0.740480 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 40.947999894619 +/- 11.6624637198907
Measured from: -0.239999830722809
to: 40.7080000638962 [s; relative to TRIGTIME]
T50: 4.90399998426437 +/- 0.181945018323369
Measured from: 1.06800013780594
to: 5.97200012207031 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.259999990463257
to: 0.740000009536743 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.29999995231628
to: 80.2919999957085 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.972388 2.936544 2.856088 0.909526
0.062275 0.060590 0.053680 0.043277 [error]
Peak 0.304926 0.504279 0.458312 0.098499
0.010941 0.012490 0.012011 0.007443 [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 5.35e-07 1.22e-06 2.19e-06 9.31e-06 5.96e-06 1.32e-05 erg/cm2
Error 2.89e-08 3.77e-08 5.56e-08 5.86e-07 1.43e-07 6.01e-07 erg/cm2
Peak flux Power-law 3.09e+00 3.54e+00 2.90e+00 3.99e+00 1.10e+01 1.35e+01 ph/cm2/s
Error 1.79e-01 1.23e-01 9.80e-02 2.87e-01 3.39e-01 4.06e-01 ph/cm2/s
Fluence Cutoff-PL 5.34e-07 1.22e-06 2.19e-06 9.24e-06 5.96e-06 1.32e-05 erg/cm2
Error 2.85e-08 3.76e-08 5.57e-08 5.78e-07 1.44e-07 4.80e-07 erg/cm2
Peak flux Cutoff-PL 2.70e+00 3.62e+00 3.07e+00 2.50e+00 1.07e+01 1.19e+01 ph/cm2/s
Error 2.28e-01 1.34e-01 1.21e-01 4.64e-01 3.57e-01 6.02e-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 1.20e+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 1.153 0.046 - - 7.10e-03 1.70e-04 57.560 57
CPL 1.148 0.046 10000.0 0.0 7.13e-03 1.70e-04 57.710 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.285 0.052 - - 9.23e-02 2.70e-03 81.640 57
CPL 0.769 0.218 135.2 39.3 1.57e-01 3.49e-02 63.530 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: 29.824000 sec.
T50 in the 50-300 keV band: 4.480000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 81.592 -1.300 80.292
T90 40.948 -0.240 40.708
T50 4.904 1.068 5.972
Peak 1.000 -0.260 0.740
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
280.5128 -28.5361 0.0024 16.2 175.3 7.8914 81.1 TRIG_00458448
------------------------------------------
Foreground time interval of the image:
-1.300 15.737 (delta_t = 17.037 [sec])
Background time interval of the image:
-239.664 -1.300 (delta_t = 238.364 [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 -1.300 sec. to 80.292 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15291 ( -0.0457338 0.0454716 )
Norm@50keV : 7.09943E-03 ( -0.000169891 0.000169376 )
------------------------------------------------------------
# Chi-Squared = 57.56 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 57 degrees of freedom
# Null hypothesis probability = 4.542361e-01
Photon flux (15-150 keV) in 81.59 sec: 0.828230 ( -0.0213988 0.0215205 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.95775e-06 ( -1.43261e-07 1.43512e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.300 sec. to 80.292 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14785 ( -0.0490047 0.0433908 )
Epeak [keV] : 10000.00 ( )
Norm@50keV : 7.13481E-03 ( -0.00017022 0.000169738 )
------------------------------------------------------------
# Chi-Squared = 57.71 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 56 degrees of freedom
# Null hypothesis probability = 4.119974e-01
Photon flux (15-150 keV) in 81.59 sec: 0.828135 ( -0.021666 0.021135 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.95807e-06 ( -1.42505e-07 1.44643e-07 ) ergs/cm2
Band function
Time interval is from -1.300 sec. to 80.292 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.902336 ( 0.902398 0.902398 )
beta : -1.15291 ( -0.0454836 0.0457359 )
Epeak [keV] : 55.9436 ( -55.9193 -55.9193 )
Norm@50keV : 1.28403E-02 ( -0.0043897 0 )
------------------------------------------------------------
# Chi-Squared = 57.56 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 55 degrees of freedom
# Null hypothesis probability = 3.805551e-01
Photon flux (15-150 keV) in 81.59 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] : 22.0128 ( )
R^2/D10^2 : 2.73206E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 436.94 using 59 PHA bins.
# Reduced chi-squared = 7.6656 for 57 degrees of freedom
# Null hypothesis probability = 5.659029e-60
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.998e-07 1.061e-08
25- 50 1.057e-06 3.998e-08
50-150 3.827e-06 1.252e-07
15-150 5.084e-06 1.420e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 3.58868 ( )
------------------------------------------------------------
# Chi-Squared = 319.89 using 59 PHA bins.
# Reduced chi-squared = 5.6121 for 57 degrees of freedom
# Null hypothesis probability = 2.939518e-38
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.291e-07 3.702e-07
25- 50 1.403e-06 7.090e-07
50-150 3.076e-06 1.561e-06
15-150 5.208e-06 2.643e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.90840 (-0.884293 0.95671)
R1^2/D10^2 : 0.325006 (-0.087824 0.131225)
kT2 [keV] : 40.0559 (-4.43414 6.35017)
R2^2/D10^2 : 3.59373E-03 (-0.00124448 0.00155522)
------------------------------------------------------------
# Chi-Squared = 68.18 using 59 PHA bins.
# Reduced chi-squared = 1.240 for 55 degrees of freedom
# Null hypothesis probability = 1.092094e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.682e-07 4.161e-08
25- 50 1.266e-06 6.568e-08
50-150 4.277e-06 2.827e-07
15-150 6.012e-06 3.635e-07
Peak spectrum fit
Power-law model
Time interval is from -0.260 sec. to 0.740 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28497 ( -0.0516347 0.0516498 )
Norm@50keV : 9.22629E-02 ( -0.00270384 0.00270381 )
------------------------------------------------------------
# Chi-Squared = 81.64 using 59 PHA bins.
# Reduced chi-squared = 1.432 for 57 degrees of freedom
# Null hypothesis probability = 1.785565e-02
Photon flux (15-150 keV) in 1 sec: 10.9773 ( -0.338543 0.339014 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.15117e-07 ( -2.90806e-08 2.91305e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.260 sec. to 0.740 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.769452 ( -0.223401 0.213287 )
Epeak [keV] : 135.227 ( -24.5644 54.0637 )
Norm@50keV : 0.157249 ( -0.0303542 0.0395332 )
------------------------------------------------------------
# Chi-Squared = 63.53 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 56 degrees of freedom
# Null hypothesis probability = 2.284300e-01
Photon flux (15-150 keV) in 1 sec: 10.6799 ( -0.3563 0.357 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.93422e-07 ( -3.0971e-08 3.0884e-08 ) ergs/cm2
Band function
Time interval is from -0.260 sec. to 0.740 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.769432 ( -0.247545 0.180413 )
beta : -10.00000 ( 1.14024e+10 1.14024e+10 )
Epeak [keV] : 135.206 ( -24.562 54.0578 )
Norm@50keV : 0.157244 ( -0.0303598 0.0395452 )
------------------------------------------------------------
# Chi-Squared = 63.53 using 59 PHA bins.
# Reduced chi-squared = 1.155 for 55 degrees of freedom
# Null hypothesis probability = 2.012187e-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] : 18.8912 ( )
R^2/D10^2 : 0.600480 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 237.08 using 59 PHA bins.
# Reduced chi-squared = 4.1593 for 57 degrees of freedom
# Null hypothesis probability = 8.021195e-24
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.221e-08 2.350e-09
25- 50 2.022e-07 8.050e-09
50-150 5.297e-07 2.750e-08
15-150 7.741e-07 2.845e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 46.0011 ( )
------------------------------------------------------------
# Chi-Squared = 151.68 using 59 PHA bins.
# Reduced chi-squared = 2.6611 for 57 degrees of freedom
# Null hypothesis probability = 1.557484e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.146e-07 5.830e-08
25- 50 2.204e-07 1.116e-07
50-150 4.833e-07 2.459e-07
15-150 8.181e-07 4.181e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.63102 (-0.943961 1.0463)
R1^2/D10^2 : 6.37968 (-2.11111 3.53224)
kT2 [keV] : 27.7048 (-2.2747 2.96745)
R2^2/D10^2 : 0.139033 (-0.0429893 0.0513359)
------------------------------------------------------------
# Chi-Squared = 59.38 using 59 PHA bins.
# Reduced chi-squared = 1.080 for 55 degrees of freedom
# Null hypothesis probability = 3.192382e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.222e-08 1.041e-08
25- 50 2.085e-07 1.475e-08
50-150 6.045e-07 4.945e-08
15-150 8.953e-07 5.975e-08
Plot creation:
Mon Aug 1 03:43:04 EDT 2011