batgrbproduct Analysis for Trigger=501485
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): Sat Aug 27 02:08:37 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger501485/GCN5_download_cron
======================================================================
Trigger: 00501485 Segment: 000
BAT Trigger Time: 336040216 [s; MET]
Trigger Stop: 336040280 [s; MET]
UTC: 2011-08-26T08:30:08.700600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 264.164985090561 Dec: -27.3749846904929 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.59
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.59
Flight Position: [ source = BAT ]
RA: 264.164985090561 Dec: -27.3749846904929 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 264.121191670142 Dec: -27.3172495932002 [deg; J2000]
{ 17h 36m 29.1s , -27d 19' 02.1" }
+/- 3.90753598731594 [arcmin] (estimated 90% radius based on SNR)
+/- 2.39952653137379 [arcmin] (formal 1-sigma fit error)
SNR: 4.34052922877921
Angular difference between Flight and Ground position is 4.177011 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.189907 0.183517 0.016685 0.007059
0.044905 0.041298 0.036330 0.034412 [error]
Peak 0.189907 0.183517 0.016685 0.007059
0.044905 0.041298 0.036330 0.034412 [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 5.05e-08 5.80e-08 4.79e-08 6.62e-08 1.80e-07 2.23e-07 erg/cm2
Error 1.75e-08 1.85e-08 2.74e-08 8.42e-08 6.65e-08 1.14e-07 erg/cm2
Peak flux Power-law 2.62e-02 1.67e-02 6.89e-03 3.86e-03 5.18e-02 5.37e-02 ph/cm2/s
Error 9.24e-03 5.20e-03 3.82e-03 4.62e-03 1.51e-02 1.59e-02 ph/cm2/s
Fluence Cutoff-PL 4.92e-08 7.76e-08 6.12e-09 2.02e-12 1.33e-07 1.33e-07 erg/cm2
Error 2.06e-08 2.83e-08 1.69e-08 1.27e-09 4.16e-08 4.16e-08 erg/cm2
Peak flux Cutoff-PL 2.43e-02 2.33e-02 1.07e-03 1.90e-07 4.87e-02 4.87e-02 ph/cm2/s
Error 1.07e-02 7.86e-03 2.64e-03 1.09e-04 1.39e-02 1.39e-02 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 3.48e-02 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 2.277 0.561 - - 3.00e-04 1.29e-04 52.800 57
CPL -4.761 0.250 28.3 5.8 2.34e+01 0.00e+00 46.780 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.277 0.561 - - 3.00e-04 1.29e-04 52.800 57
CPL -4.761 0.250 28.3 5.8 2.34e+01 0.00e+00 46.780 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 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
264.1212 -27.3172 0.0440 3.5 -47.7 0.3879 4.3 TRIG_00501485
------------------------------------------
Foreground time interval of the image:
0.000 49.210 (delta_t = 49.210 [sec])
50.000 64.000 (delta_t = 14.000 [sec])
Background time interval of the image:
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
Multiple GTIs in the spectrum
tstart tstop
0.000000 49.210000
50.000000 64.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.27690 ( -0.518346 0.603506 )
Norm@50keV : 3.00048E-04 ( -0.000127572 0.000130351 )
------------------------------------------------------------
# Chi-Squared = 52.80 using 59 PHA bins.
# Reduced chi-squared = 0.9262 for 57 degrees of freedom
# Null hypothesis probability = 6.334541e-01
Photon flux (15-150 keV) in 63.21 sec: 5.17673E-02 ( -0.0150574 0.0150871 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80398e-07 ( -6.30402e-08 7.0031e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 49.210000
50.000000 64.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.76139 ( 3.44898 3.94805 )
Epeak [keV] : 28.3296 ( -5.56201 5.95468 )
Norm@50keV : 23.3970 ( )
------------------------------------------------------------
# Chi-Squared = 46.78 using 59 PHA bins.
# Reduced chi-squared = 0.8354 for 56 degrees of freedom
# Null hypothesis probability = 8.050863e-01
Photon flux (15-150 keV) in 63.21 sec: 4.87043E-02 ( -0.0138295 0.0140019 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32889e-07 ( -3.93141e-08 4.38551e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 49.210000
50.000000 64.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.94271 ( -45.2772 -35.3242 )
beta : -9.37023 ( 9.99772 19.9906 )
Epeak [keV] : 28.3679 ( -4.56119 5.28946 )
Norm@50keV : 31.2373 ( -14.374 27.0311 )
------------------------------------------------------------
# Chi-Squared = 46.78 using 59 PHA bins.
# Reduced chi-squared = 0.8505 for 55 degrees of freedom
# Null hypothesis probability = 7.771203e-01
Photon flux (15-150 keV) in 63.21 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] : 7.18279 (-1.49201 1.92184)
R^2/D10^2 : 9.66996E-02 (-0.0611319 0.156423)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 47.57 using 59 PHA bins.
# Reduced chi-squared = 0.8345 for 57 degrees of freedom
# Null hypothesis probability = 8.089852e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.199e-08 2.644e-08
25- 50 7.482e-08 4.510e-08
50-150 1.360e-08 1.054e-08
15-150 1.404e-07 8.552e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 33.1446 (-14.8155 41.7653)
Norm : 0.392414 (-0.168284 0.30516)
------------------------------------------------------------
# Chi-Squared = 50.82 using 59 PHA bins.
# Reduced chi-squared = 0.8915 for 57 degrees of freedom
# Null hypothesis probability = 7.048946e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.294e-08 2.551e-08
25- 50 6.377e-08 3.554e-08
50-150 3.965e-08 3.241e-08
15-150 1.564e-07 9.262e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.954 ( )
R1^2/D10^2 : 1.91185E-06 (-1.91082e-06 6.00218e-06)
kT2 [keV] : 7.02629 (-7.02636 1.94074)
R2^2/D10^2 : 0.103926 (-0.0663065 0.172963)
------------------------------------------------------------
# Chi-Squared = 47.57 using 59 PHA bins.
# Chi-Squared = 47.25 using 59 PHA bins.
# Reduced chi-squared = 0.8649 for 55 degrees of freedom
# Reduced chi-squared = 0.8591 for 55 degrees of freedom
# Null hypothesis probability = 7.513747e-01
# Null hypothesis probability = 7.619013e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.216e-08 2.470e-02
25- 50 7.466e-08 1.977e-01
50-150 1.346e-08 5.009e+00
15-150 1.403e-07 5.373e+00
Peak spectrum fit
Power-law model
Time interval is from 50.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.27690 ( -0.518346 0.603506 )
Norm@50keV : 3.00048E-04 ( -0.000127572 0.000130351 )
------------------------------------------------------------
# Chi-Squared = 52.80 using 59 PHA bins.
# Reduced chi-squared = 0.9262 for 57 degrees of freedom
# Null hypothesis probability = 6.334541e-01
Photon flux (15-150 keV) in 63.21 sec: 5.17673E-02 ( -0.0150574 0.0150871 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80398e-07 ( -6.30402e-08 7.0031e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 50.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.76139 ( 3.44898 3.94805 )
Epeak [keV] : 28.3296 ( -5.56201 5.95468 )
Norm@50keV : 23.3970 ( )
------------------------------------------------------------
# Chi-Squared = 46.78 using 59 PHA bins.
# Reduced chi-squared = 0.8354 for 56 degrees of freedom
# Null hypothesis probability = 8.050863e-01
Photon flux (15-150 keV) in 63.21 sec: 4.87043E-02 ( -0.0138295 0.0140019 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32889e-07 ( -3.93141e-08 4.38551e-08 ) ergs/cm2
Band function
Time interval is from 50.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.94271 ( -45.3224 -35.3242 )
beta : -9.37023 ( 9.99772 19.9906 )
Epeak [keV] : 28.3679 ( -4.56119 5.28946 )
Norm@50keV : 31.2373 ( -14.374 27.0311 )
------------------------------------------------------------
# Chi-Squared = 46.78 using 59 PHA bins.
# Reduced chi-squared = 0.8505 for 55 degrees of freedom
# Null hypothesis probability = 7.771203e-01
Photon flux (15-150 keV) in 63.21 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] : 7.18279 (-1.49201 1.92184)
R^2/D10^2 : 9.66996E-02 (-0.0611319 0.156423)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 47.57 using 59 PHA bins.
# Reduced chi-squared = 0.8345 for 57 degrees of freedom
# Null hypothesis probability = 8.089852e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.199e-08 3.095e-08
25- 50 7.482e-08 4.627e-08
50-150 1.360e-08 1.127e-08
15-150 1.404e-07 8.755e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 33.1446 (-14.8155 41.7653)
Norm : 0.392414 (-0.168284 0.30516)
------------------------------------------------------------
# Chi-Squared = 50.82 using 59 PHA bins.
# Reduced chi-squared = 0.8915 for 57 degrees of freedom
# Null hypothesis probability = 7.048946e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.294e-08 2.563e-08
25- 50 6.377e-08 3.820e-08
50-150 3.965e-08 3.373e-08
15-150 1.564e-07 8.763e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.954 ( )
R1^2/D10^2 : 1.91185E-06 (-1.91082e-06 6.00218e-06)
kT2 [keV] : 7.02629 (-7.02636 1.94074)
R2^2/D10^2 : 0.103926 (-0.0663065 0.172963)
------------------------------------------------------------
# Chi-Squared = 47.57 using 59 PHA bins.
# Chi-Squared = 47.25 using 59 PHA bins.
# Reduced chi-squared = 0.8649 for 55 degrees of freedom
# Reduced chi-squared = 0.8591 for 55 degrees of freedom
# Null hypothesis probability = 7.513747e-01
# Null hypothesis probability = 7.619013e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.216e-08 2.379e-02
25- 50 7.466e-08 1.856e-01
50-150 1.346e-08 4.491e+00
15-150 1.403e-07 5.019e+00
Plot creation:
Sat Aug 27 02:27:56 EDT 2011