batgrbproduct Analysis for Trigger=500914
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 19 12:30:54 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger500914/GCN5_download_cron
======================================================================
Trigger: 00500914 Segment: 000
BAT Trigger Time: 335392676.48 [s; MET]
Trigger Stop: 335392688.64 [s; MET]
UTC: 2011-08-18T20:37:49.205860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 317.383618630044 Dec: -63.969654053451 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.23
Image Trigger?: NO
Rate S/N Ratio: 16.0312195418814 [ if not an image trigger ]
Image S/N Ratio: 14.23
Flight Position: [ source = BAT ]
RA: 317.383618630044 Dec: -63.969654053451 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 317.373925288217 Dec: -63.981543925366 [deg; J2000]
{ 21h 09m 29.7s , -63d 58' 53.6" }
+/- 1.40360852316708 [arcmin] (estimated 90% radius based on SNR)
+/- 0.483734738527557 [arcmin] (formal 1-sigma fit error)
SNR: 18.7398864946912
Angular difference between Flight and Ground position is 0.757658 arcmin
Partial Coding Fraction: 0.2929688 [ including projection effects ]
Duration
T90: 102.98399990797 +/- 18.0548005975559
Measured from: -4.25999987125397
to: 98.7240000367165 [s; relative to TRIGTIME]
T50: 38.2159999608994 +/- 4.89359579544612
Measured from: 9.63600009679794
to: 47.8520000576973 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 27.2599999904633
to: 28.2599999904633 [s; relative to TRIGTIME]
Total Fluence
Measured from: -14.1640000343323
to: 117.351999998093 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.583967 2.220573 1.731781 0.392403
0.132189 0.119942 0.101655 0.086233 [error]
Peak 0.047295 0.043030 0.083654 0.013952
0.012216 0.011457 0.010507 0.008460 [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 5.77e-07 1.01e-06 1.36e-06 3.76e-06 3.96e-06 6.71e-06 erg/cm2
Error 6.50e-08 6.72e-08 1.02e-07 6.27e-07 2.48e-07 6.90e-07 erg/cm2
Peak flux Power-law 3.76e-01 4.79e-01 4.46e-01 7.31e-01 1.55e+00 2.03e+00 ph/cm2/s
Error 1.52e-01 1.17e-01 8.03e-02 2.99e-01 3.01e-01 3.56e-01 ph/cm2/s
Fluence Cutoff-PL 5.66e-07 1.02e-06 1.37e-06 3.26e-06 3.93e-06 6.20e-06 erg/cm2
Error 7.71e-08 7.54e-08 1.11e-07 1.28e-06 2.70e-07 1.31e-06 erg/cm2
Peak flux Cutoff-PL 3.75e-01 4.79e-01 4.52e-01 6.75e-01 1.55e+00 2.03e+00 ph/cm2/s
Error 2.70e-01 1.19e-01 1.01e-01 4.04e-01 3.23e-01 5.22e-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 1.98e+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 1.573 0.109 - - 3.21e-03 1.91e-04 70.910 57
CPL 1.475 0.326 280.2 0.0 3.58e-03 1.41e-03 70.750 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.102 0.331 - - 1.33e-02 2.43e-03 61.100 57
CPL 1.096 1.887 9986.3 0.0 1.34e-02 2.49e-02 61.090 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: 67.328000 sec.
T50 in the 50-300 keV band: 27.648000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 131.516 -14.164 117.352
T90 102.984 -4.260 98.724
T50 38.216 9.636 47.852
Peak 1.000 27.260 28.260
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
317.3739 -63.9815 0.0102 41.8 154.2 6.1484 18.7 TRIG_00500914
------------------------------------------
Foreground time interval of the image:
-14.164 117.352 (delta_t = 131.516 [sec])
Background time interval of the image:
-143.979 -20.300 (delta_t = 123.679 [sec])
-16.480 -14.164 (delta_t = 2.316 [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 -14.164 sec. to 117.352 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57330 ( -0.108863 0.108983 )
Norm@50keV : 3.20814E-03 ( -0.000191277 0.000191056 )
------------------------------------------------------------
# Chi-Squared = 70.91 using 59 PHA bins.
# Reduced chi-squared = 1.244 for 57 degrees of freedom
# Null hypothesis probability = 1.019222e-01
Photon flux (15-150 keV) in 131.5 sec: 0.408925 ( -0.0264649 0.026585 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.95882e-06 ( -2.47931e-07 2.48933e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -14.164 sec. to 117.352 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47453 ( -0.454221 0.19778 )
Epeak [keV] : 280.239 ( -281.031 -281.031 )
Norm@50keV : 3.57956E-03 ( -0.000545928 0.00226817 )
------------------------------------------------------------
# Chi-Squared = 70.75 using 59 PHA bins.
# Reduced chi-squared = 1.263 for 56 degrees of freedom
# Null hypothesis probability = 8.865794e-02
Photon flux (15-150 keV) in 131.5 sec: 0.406428 ( -0.028374 0.028164 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.93498e-06 ( -2.73415e-07 2.66708e-07 ) ergs/cm2
Band function
Time interval is from -14.164 sec. to 117.352 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.946135 ( 0.941336 0.941336 )
beta : -1.65779 ( 1.65842 0.169608 )
Epeak [keV] : 64.1238 ( -63.3007 571.341 )
Norm@50keV : 7.45139E-03 ( -0.00459837 0 )
------------------------------------------------------------
# Chi-Squared = 69.83 using 59 PHA bins.
# Reduced chi-squared = 1.270 for 55 degrees of freedom
# Null hypothesis probability = 8.596927e-02
Photon flux (15-150 keV) in 131.5 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] : 15.2831 ( )
R^2/D10^2 : 4.14807E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 136.48 using 59 PHA bins.
# Reduced chi-squared = 2.3943 for 57 degrees of freedom
# Null hypothesis probability = 1.815148e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.659e-07 3.386e-08
25- 50 1.075e-06 9.685e-08
50-150 1.722e-06 1.959e-07
15-150 3.063e-06 2.209e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-50.3716 -199.957)
Norm : 1.65353 (-0.0979746 0.0982116)
------------------------------------------------------------
# Chi-Squared = 71.36 using 59 PHA bins.
# Reduced chi-squared = 1.252 for 57 degrees of freedom
# Null hypothesis probability = 9.555352e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.414e-07 2.792e-07
25- 50 1.042e-06 5.370e-07
50-150 2.284e-06 1.180e-06
15-150 3.867e-06 2.006e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.78337 (-1.70793 1.8172)
R1^2/D10^2 : 0.217414 (-0.0950678 0.214968)
kT2 [keV] : 35.9412 (-10.2115 33.7849)
R2^2/D10^2 : 1.57246E-03 (-0.00130006 0.00227427)
------------------------------------------------------------
# Chi-Squared = 73.17 using 59 PHA bins.
# Reduced chi-squared = 1.330 for 55 degrees of freedom
# Null hypothesis probability = 5.112846e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.610e-07 1.059e-07
25- 50 1.112e-06 2.024e-07
50-150 2.345e-06 1.006e-06
15-150 3.918e-06 1.112e-06
Peak spectrum fit
Power-law model
Time interval is from 27.260 sec. to 28.260 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10226 ( -0.339137 0.322521 )
Norm@50keV : 1.33417E-02 ( -0.0024584 0.00240634 )
------------------------------------------------------------
# Chi-Squared = 61.10 using 59 PHA bins.
# Reduced chi-squared = 1.072 for 57 degrees of freedom
# Null hypothesis probability = 3.310782e-01
Photon flux (15-150 keV) in 1 sec: 1.54786 ( -0.298116 0.303249 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.39389e-07 ( -2.47044e-08 2.47897e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 27.260 sec. to 28.260 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09648 ( -1.67546 2.0989 )
Epeak [keV] : 9986.34 ( )
Norm@50keV : 1.34129E-02 ( -0.00230894 0.0475842 )
------------------------------------------------------------
# Chi-Squared = 61.09 using 59 PHA bins.
# Reduced chi-squared = 1.091 for 56 degrees of freedom
# Null hypothesis probability = 2.980285e-01
Photon flux (15-150 keV) in 1 sec: 1.54771 ( -0.34497 0.30046 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3916e-07 ( -2.5175e-08 2.5003e-08 ) ergs/cm2
Band function
Time interval is from 27.260 sec. to 28.260 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.00744 ( 0.904822 0.904822 )
beta : -8.01455 ( 9.37212 19.3721 )
Epeak [keV] : 663.340 ( -665.107 -665.107 )
Norm@50keV : 1.45610E-02 ( -0.00250053 0.00525725 )
------------------------------------------------------------
# Chi-Squared = 61.08 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 55 degrees of freedom
# Null hypothesis probability = 2.667290e-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] : 24.8001 (-4.69166 6.68734)
R^2/D10^2 : 3.67973E-02 (-0.0194859 0.0358261)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 64.79 using 59 PHA bins.
# Reduced chi-squared = 1.137 for 57 degrees of freedom
# Null hypothesis probability = 2.234378e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.948e-09 1.581e-09
25- 50 2.231e-08 7.595e-09
50-150 1.019e-07 3.307e-08
15-150 1.281e-07 4.075e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.998 ( )
Norm : 6.74294 (-6.74294 -6.74294)
------------------------------------------------------------
# Chi-Squared = 67.66 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 57 degrees of freedom
# Null hypothesis probability = 1.577299e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.679e-08 9.220e-09
25- 50 3.230e-08 1.817e-08
50-150 7.084e-08 3.961e-08
15-150 1.199e-07 6.615e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.10992 (-1.50372 2.21416)
R1^2/D10^2 : 12.8290 (-11.2274 66.0985)
kT2 [keV] : 28.6459 (-6.07957 9.91511)
R2^2/D10^2 : 2.20753E-02 (-0.0132786 0.030269)
------------------------------------------------------------
# Chi-Squared = 56.28 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 55 degrees of freedom
# Null hypothesis probability = 4.268136e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.620e-08 8.943e-09
25- 50 2.281e-08 9.900e-09
50-150 1.040e-07 4.994e-08
15-150 1.430e-07 5.819e-08
Plot creation:
Fri Aug 19 12:48:02 EDT 2011