batgrbproduct Analysis for Trigger=500100
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): Fri Aug 12 13:17:40 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger500100/GCN5_download_cron
======================================================================
Trigger: 00500100 Segment: 000
BAT Trigger Time: 334823891.136 [s; MET]
Trigger Stop: 334823918.016 [s; MET]
UTC: 2011-08-12T06:38:03.884040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 135.531579592115 Dec: -40.558481890169 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 16.84
Image Trigger?: NO
Rate S/N Ratio: 31.6701752442262 [ if not an image trigger ]
Image S/N Ratio: 16.84
Flight Position: [ source = BAT ]
RA: 135.531579592115 Dec: -40.558481890169 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 135.29803252226 Dec: -40.5245979701403 [deg; J2000]
{ 09h 01m 11.5s , -40d 31' 28.6" }
+/- 10.7588915732078 [arcmin] (estimated 90% radius based on SNR)
+/- 9.25520109534102 [arcmin] (formal 1-sigma fit error)
SNR: 1.02132688582196
Angular difference between Flight and Ground position is 10.841164 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 451.199999988079 +/- 111.338388671289
Measured from: -170.079999864101
to: 281.120000123978 [s; relative to TRIGTIME]
T50: 92.9919999837875 +/- 176.688833857157
Measured from: -61.5359998345375
to: 31.45600014925 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 25.3560000061989
to: 26.3560000061989 [s; relative to TRIGTIME]
Total Fluence
Measured from: -181.215999960899
to: 380.896000027657 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 8.326549 5.079895 0.245744 0.095615
0.113921 0.113603 0.099069 0.090643 [error]
Peak 0.042638 0.029608 0.003523 0.008060
0.005101 0.005149 0.004208 0.003715 [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 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 Power-law 3.76e-01 1.96e-01 6.35e-02 2.65e-02 6.50e-01 6.62e-01 ph/cm2/s
Error 7.58e-02 4.21e-02 2.74e-02 2.04e-02 1.15e-01 1.19e-01 ph/cm2/s
Fluence Cutoff-PL 2.36e-06 2.07e-06 1.16e-07 5.33e-11 4.55e-06 4.55e-06 erg/cm2
Error 1.95e-07 8.96e-08 3.64e-08 1.04e-10 2.25e-07 2.25e-07 erg/cm2
Peak flux Cutoff-PL 3.61e-01 2.42e-01 2.58e-02 1.83e-04 6.28e-01 6.28e-01 ph/cm2/s
Error 8.47e-02 6.05e-02 3.25e-02 5.30e-03 1.10e-01 1.10e-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 0.00e+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 3.426 0.000 - - 6.72e-04 0.00e+00 216.110 57
CPL 1.000 0.000 50.0 0.0 2.74e-03 0.00e+00 973.630 56
The chi2 of BB fit is 39.55 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.626 0.403 - - 3.06e-03 1.02e-03 78.270 57
CPL -0.045 3.444 23.3 0.0 2.13e-01 0.00e+00 74.370 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 562.112 -181.216 380.896
T90 451.200 -170.080 281.120
T50 92.992 -61.536 31.456
Peak 1.000 25.356 26.356
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
135.2980 -40.5246 0.1887 8.2 94.2 0.3686 1.0 TRIG_00500100
------------------------------------------
Foreground time interval of the image:
-181.216 -56.261 (delta_t = 124.955 [sec])
-55.136 85.565 (delta_t = 140.701 [sec])
Background time interval of the image:
-239.136 -181.216 (delta_t = 57.920 [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
Multiple GTIs in the spectrum
tstart tstop
-181.216000 -56.261500
-55.136000 380.896000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.42589 ( )
Norm@50keV : 6.72111E-04 ( )
------------------------------------------------------------
# Chi-Squared = 216.11 using 59 PHA bins.
# Reduced chi-squared = 3.7915 for 57 degrees of freedom
# Null hypothesis probability = 2.313291e-20
Photon flux (15-150 keV) in 561 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-181.216000 -56.261500
-55.136000 380.896000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.73874E-03 ( )
------------------------------------------------------------
# Chi-Squared = 973.63 using 59 PHA bins.
# Reduced chi-squared = 17.386 for 56 degrees of freedom
# Null hypothesis probability = 1.332707e-167
Photon flux (15-150 keV) in 561 sec: 0.209796 ( -0.012325 0.012418 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.54864e-06 ( -2.24641e-07 2.26133e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-181.216000 -56.261500
-55.136000 380.896000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.41602 ( -0.709345 1.46024 )
beta : -7.04217 ( 5.75928 0.0893744 )
Epeak [keV] : 22.5976 ( -1.54679 0.706498 )
Norm@50keV : 6.22791 ( -7.2628 39.6495 )
------------------------------------------------------------
# Chi-Squared = 37.88 using 59 PHA bins.
# Reduced chi-squared = 0.6887 for 55 degrees of freedom
# Null hypothesis probability = 9.621416e-01
Photon flux (15-150 keV) in 561 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] : 5.55764 (-0.166509 0.172453)
R^2/D10^2 : 1.19975 (-0.179111 0.210778)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 39.55 using 59 PHA bins.
# Reduced chi-squared = 0.6938 for 57 degrees of freedom
# Null hypothesis probability = 9.620621e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.454e-06 1.456e-07
25- 50 2.061e-06 8.920e-08
50-150 1.364e-07 2.121e-08
15-150 4.651e-06 1.753e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.8752 (-0.822895 0.892144)
Norm : 4.46776 (-0.467567 0.524182)
------------------------------------------------------------
# Chi-Squared = 93.87 using 59 PHA bins.
# Reduced chi-squared = 1.647 for 57 degrees of freedom
# Null hypothesis probability = 1.518474e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.884e-06 1.534e-07
25- 50 1.950e-06 8.527e-08
50-150 3.377e-07 5.167e-08
15-150 5.171e-06 1.905e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.984 ( )
R1^2/D10^2 : 3.56305E-07 (-3.56305e-07 1.66143e-06)
kT2 [keV] : 5.55009 (-0.169515 0.175942)
R2^2/D10^2 : 1.20709 (-0.182746 0.215501)
------------------------------------------------------------
# Chi-Squared = 39.55 using 59 PHA bins.
# Chi-Squared = 39.42 using 59 PHA bins.
# Reduced chi-squared = 0.7191 for 55 degrees of freedom
# Reduced chi-squared = 0.7168 for 55 degrees of freedom
# Null hypothesis probability = 9.422793e-01
# Null hypothesis probability = 9.439711e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.454e-06 8.224e+02
25- 50 2.061e-06 7.635e+03
50-150 1.364e-07 1.856e+05
15-150 4.651e-06 1.783e+05
Peak spectrum fit
Power-law model
Time interval is from 25.356 sec. to 26.356 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.62646 ( -0.370715 0.436147 )
Norm@50keV : 3.05535E-03 ( -0.00100119 0.00103154 )
------------------------------------------------------------
# Chi-Squared = 78.27 using 59 PHA bins.
# Reduced chi-squared = 1.373 for 57 degrees of freedom
# Null hypothesis probability = 3.227554e-02
Photon flux (15-150 keV) in 1 sec: 0.649890 ( -0.114835 0.115068 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.17123e-08 ( -7.20353e-09 7.76502e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 25.356 sec. to 26.356 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.46030E-02 ( -4.63133 2.25596 )
Epeak [keV] : 23.3133 ( )
Norm@50keV : 0.213145 ( )
------------------------------------------------------------
# Chi-Squared = 74.37 using 59 PHA bins.
# Reduced chi-squared = 1.328 for 56 degrees of freedom
# Null hypothesis probability = 5.080681e-02
Photon flux (15-150 keV) in 1 sec: 0.628285 ( -0.110118 0.110794 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.65718e-08 ( -5.3326e-09 6.3252e-09 ) ergs/cm2
Band function
Time interval is from 25.356 sec. to 26.356 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.944749 ( -2.23374 -0.965868 )
beta : -8.30421 ( 6.56136 16.5578 )
Epeak [keV] : 24.8353 ( -6.43435 4.96248 )
Norm@50keV : 0.900808 ( -0.900822 570.555 )
------------------------------------------------------------
# Chi-Squared = 74.31 using 59 PHA bins.
# Reduced chi-squared = 1.351 for 55 degrees of freedom
# Null hypothesis probability = 4.241588e-02
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] : 6.56755 (-1.0214 1.15442)
R^2/D10^2 : 1.69365 (-0.840326 1.76422)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 74.51 using 59 PHA bins.
# Reduced chi-squared = 1.307 for 57 degrees of freedom
# Null hypothesis probability = 5.959895e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.093e-08 3.413e-09
25- 50 1.319e-08 4.320e-09
50-150 1.725e-09 1.071e-09
15-150 2.584e-08 7.545e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 24.6816 (-7.62946 12.4347)
Norm : 6.34906 (-2.03494 3.25504)
------------------------------------------------------------
# Chi-Squared = 75.57 using 59 PHA bins.
# Reduced chi-squared = 1.326 for 57 degrees of freedom
# Null hypothesis probability = 5.041119e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.153e-08 2.745e-09
25- 50 1.172e-08 3.193e-09
50-150 4.891e-09 3.372e-09
15-150 2.814e-08 8.400e-09
Double BB
R1^2/D10^2 : 1.88797 ( )
kT2 [keV] : 185.156 ( )
R2^2/D10^2 : 3.18275E-05 (-3.13761e-05 2.76627)
------------------------------------------------------------
# Chi-Squared = 73.31 using 59 PHA bins.
# Chi-Squared = 73.20 using 59 PHA bins.
# Chi-Squared = 73.12 using 59 PHA bins.
# Reduced chi-squared = 1.333 for 55 degrees of freedom
# Reduced chi-squared = 1.331 for 55 degrees of freedom
# Reduced chi-squared = 1.329 for 55 degrees of freedom
# Null hypothesis probability = 5.003242e-02
# Null hypothesis probability = 5.095351e-02
# Null hypothesis probability = 5.156734e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.087e-08 5.855e-09
25- 50 1.320e-08 7.715e-09
50-150 2.226e-09 1.581e-09
15-150 2.630e-08 1.484e-08
Plot creation:
Fri Aug 12 13:35:25 EDT 2011