batgrbproduct Analysis for Trigger=458521
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): Tue Aug 2 08:11:46 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger458521/GCN5_download_cron
======================================================================
Trigger: 00458521 Segment: 000
BAT Trigger Time: 333920990.208 [s; MET]
Trigger Stop: 333920994.304 [s; MET]
UTC: 2011-08-01T19:49:42.991200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 89.2848875077534 Dec: 80.9884210932685 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.83
Image Trigger?: NO
Rate S/N Ratio: 8.83176086632785 [ if not an image trigger ]
Image S/N Ratio: 7.83
Flight Position: [ source = BAT ]
RA: 89.2848875077534 Dec: 80.9884210932685 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 89.4150579518812 Dec: 80.9579294489934 [deg; J2000]
{ 05h 57m 39.6s , +80d 57' 28.5" }
+/- 1.07388896576803 [arcmin] (estimated 90% radius based on SNR)
+/- 0.291976809894832 [arcmin] (formal 1-sigma fit error)
SNR: 27.4720263421207
Angular difference between Flight and Ground position is 2.201969 arcmin
Partial Coding Fraction: 0.78125 [ including projection effects ]
Duration
T90: 385.267999947071 +/- 8.96954068200079
Measured from: -11.7119998931885
to: 373.556000053883 [s; relative to TRIGTIME]
T50: 329.483999967575 +/- 7.36543304757893
Measured from: 11.7360001206398
to: 341.220000088215 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 341.783999979496
to: 342.783999979496 [s; relative to TRIGTIME]
Total Fluence
Measured from: -24.1800000071526
to: 384.987999975681 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.833015 3.050025 1.979639 0.365099
0.122262 0.127615 0.118041 0.115043 [error]
Peak 0.041359 0.051709 0.029146 0.010304
0.006570 0.006820 0.006027 0.005678 [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 9.02e-07 1.35e-06 1.51e-06 3.18e-06 4.72e-06 6.94e-06 erg/cm2
Error 7.46e-08 6.71e-08 1.21e-07 5.40e-07 2.72e-07 6.43e-07 erg/cm2
Peak flux Power-law 4.60e-01 3.68e-01 1.99e-01 1.57e-01 1.10e+00 1.18e+00 ph/cm2/s
Error 1.01e-01 5.58e-02 5.09e-02 7.72e-02 1.66e-01 1.84e-01 ph/cm2/s
Fluence Cutoff-PL 8.73e-07 1.38e-06 1.51e-06 2.17e-06 4.61e-06 5.93e-06 erg/cm2
Error 8.81e-08 8.20e-08 1.25e-07 1.20e-06 3.24e-07 1.27e-06 erg/cm2
Peak flux Cutoff-PL 4.49e-01 3.79e-01 1.99e-01 1.09e+00 1.14e+00 0.00e+00 ph/cm2/s
Error 1.10e-01 6.85e-02 5.36e-02 1.70e-01 2.12e-01 0.00e+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 1.13e+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 1.840 0.100 - - 1.25e-03 7.12e-05 77.420 57
CPL 1.615 0.296 78.6 -26.2 1.65e-03 7.31e-04 76.340 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.889 0.291 - - 7.69e-03 1.48e-03 60.650 57
CPL 1.646 0.939 62.5 0.0 1.06e-02 0.00e+00 60.450 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: 384.960000 sec.
T50 in the 50-300 keV band: 247.040000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 409.168 -24.180 384.988
T90 385.268 -11.712 373.556
T50 329.484 11.736 341.220
Peak 1.000 341.784 342.784
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
89.4151 +80.9579 0.0070 25.3 -132.1 3.5936 27.5 TRIG_00458521
------------------------------------------
Foreground time interval of the image:
-24.180 36.093 (delta_t = 60.273 [sec])
Background time interval of the image:
-239.208 -24.180 (delta_t = 215.028 [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 -24.180 sec. to 384.988 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84007 ( -0.0990871 0.10085 )
Norm@50keV : 1.25386E-03 ( -7.15826e-05 7.08835e-05 )
------------------------------------------------------------
# Chi-Squared = 77.42 using 59 PHA bins.
# Reduced chi-squared = 1.358 for 57 degrees of freedom
# Null hypothesis probability = 3.727922e-02
Photon flux (15-150 keV) in 409.2 sec: 0.175536 ( -0.00892844 0.00894327 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.7184e-06 ( -2.70828e-07 2.73525e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -24.180 sec. to 384.988 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.61524 ( -0.398174 0.194593 )
Epeak [keV] : 78.6043 ( -26.2869 -78.6043 )
Norm@50keV : 1.65142E-03 ( -0.00045198 0.00101019 )
------------------------------------------------------------
# Chi-Squared = 76.34 using 59 PHA bins.
# Reduced chi-squared = 1.363 for 56 degrees of freedom
# Null hypothesis probability = 3.673660e-02
Photon flux (15-150 keV) in 409.2 sec: 0.172902 ( -0.009848 0.009848 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.60505e-06 ( -3.26173e-07 3.21713e-07 ) ergs/cm2
Band function
Time interval is from -24.180 sec. to 384.988 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.61522 ( 1.63294 0.406883 )
beta : -10.00000 ( 4.85524e+14 4.85524e+14 )
Epeak [keV] : 78.5869 ( -26.2718 -78.5869 )
Norm@50keV : 1.65112E-03 ( -0.000452154 0.00101029 )
------------------------------------------------------------
# Chi-Squared = 76.34 using 59 PHA bins.
# Reduced chi-squared = 1.388 for 55 degrees of freedom
# Null hypothesis probability = 3.004111e-02
Photon flux (15-150 keV) in 409.2 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] : 11.9074 ( )
R^2/D10^2 : 4.07436E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 170.26 using 59 PHA bins.
# Reduced chi-squared = 2.9869 for 57 degrees of freedom
# Null hypothesis probability = 3.264541e-13
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.996e-07 4.644e-08
25- 50 1.558e-06 8.716e-08
50-150 1.321e-06 1.510e-07
15-150 3.379e-06 2.081e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 96.2365 ( )
Norm : 0.769147 (-0.057304 0.0649367)
------------------------------------------------------------
# Chi-Squared = 78.18 using 59 PHA bins.
# Reduced chi-squared = 1.372 for 57 degrees of freedom
# Null hypothesis probability = 3.278746e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.155e-07 6.015e-08
25- 50 1.409e-06 8.327e-08
50-150 2.276e-06 3.092e-07
15-150 4.500e-06 3.355e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.37752 (-0.756696 0.849658)
R1^2/D10^2 : 0.552311 (-0.23906 0.479739)
kT2 [keV] : 19.9055 (-2.45276 3.30817)
R2^2/D10^2 : 4.89907E-03 (-0.00217854 0.00327585)
------------------------------------------------------------
# Chi-Squared = 72.94 using 59 PHA bins.
# Reduced chi-squared = 1.326 for 55 degrees of freedom
# Null hypothesis probability = 5.307504e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.824e-07 1.696e-07
25- 50 1.329e-06 1.798e-07
50-150 2.269e-06 4.839e-07
15-150 4.480e-06 7.492e-07
Peak spectrum fit
Power-law model
Time interval is from 341.784 sec. to 342.784 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88897 ( -0.279339 0.302198 )
Norm@50keV : 7.68893E-03 ( -0.0015055 0.00145089 )
------------------------------------------------------------
# Chi-Squared = 60.65 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 57 degrees of freedom
# Null hypothesis probability = 3.455994e-01
Photon flux (15-150 keV) in 1 sec: 1.09831 ( -0.166213 0.166214 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.0685e-08 ( -1.32644e-08 1.37223e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 341.784 sec. to 342.784 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64601 ( -1.12702 0.750049 )
Epeak [keV] : 62.5369 ( )
Norm@50keV : 1.05850E-02 ( )
------------------------------------------------------------
# Chi-Squared = 60.45 using 59 PHA bins.
# Reduced chi-squared = 1.080 for 56 degrees of freedom
# Null hypothesis probability = 3.181621e-01
Photon flux (15-150 keV) in 1 sec: 1.08860 ( -0.169733 0.16978 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 341.784 sec. to 342.784 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.13868 ( 1.49675 0.997308 )
beta : 10.00000 ( -1.97895e+15 -1.97895e+15 )
Epeak [keV] : 2.79655 ( -2.79655 -2.79655 )
Norm@50keV : 3.85547E-19 ( -3.85547e-19 -3.85547e-19 )
------------------------------------------------------------
# Chi-Squared = 100.50 using 59 PHA bins.
# Reduced chi-squared = 1.8272 for 55 degrees of freedom
# Null hypothesis probability = 1.762588e-04
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] : 9.55975 (-1.79495 2.47409)
R^2/D10^2 : 0.597942 (-0.344967 0.725454)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 72.67 using 59 PHA bins.
# Reduced chi-squared = 1.275 for 57 degrees of freedom
# Null hypothesis probability = 7.886156e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.094e-08 3.207e-09
25- 50 2.549e-08 5.865e-09
50-150 1.166e-08 4.783e-09
15-150 4.809e-08 1.042e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 82.3789 (-33.8373 85.5843)
Norm : 5.10889 (-1.04835 1.40414)
------------------------------------------------------------
# Chi-Squared = 60.77 using 59 PHA bins.
# Reduced chi-squared = 1.066 for 57 degrees of freedom
# Null hypothesis probability = 3.416235e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.328e-08 2.854e-09
25- 50 2.201e-08 4.340e-09
50-150 3.169e-08 1.939e-08
15-150 6.698e-08 2.151e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.98979 (-1.72904 1.85366)
R1^2/D10^2 : 2.63532 (-1.6449 6.78606)
kT2 [keV] : 23.5949 (-8.03886 17.7253)
R2^2/D10^2 : 1.52791E-02 (-0.0125006 0.0531519)
------------------------------------------------------------
# Chi-Squared = 58.88 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 55 degrees of freedom
# Null hypothesis probability = 3.354147e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.406e-08 7.900e-09
25- 50 2.083e-08 1.064e-08
50-150 3.592e-08 2.165e-08
15-150 7.081e-08 3.511e-08
Plot creation:
Tue Aug 2 08:38:48 EDT 2011