batgrbproduct Analysis for Trigger=501520
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 15:46:10 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger501520/GCN5_download_cron
======================================================================
Trigger: 00501520 Segment: 000
BAT Trigger Time: 336096119.808 [s; MET]
Trigger Stop: 336096123.904 [s; MET]
UTC: 2011-08-27T00:01:52.506420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 164.094969657904 Dec: 53.7870142613548 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.19
Image Trigger?: NO
Rate S/N Ratio: 9.59166304662544 [ if not an image trigger ]
Image S/N Ratio: 7.19
Flight Position: [ source = BAT ]
RA: 164.094969657904 Dec: 53.7870142613548 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 164.054461640609 Dec: 53.8144851287885 [deg; J2000]
{ 10h 56m 13.1s , +53d 48' 52.1" }
+/- 2.13773185665357 [arcmin] (estimated 90% radius based on SNR)
+/- 1.34858751354984 [arcmin] (formal 1-sigma fit error)
SNR: 10.274403654384
Angular difference between Flight and Ground position is 2.185679 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 8.54399996995926 +/- 1.14672402589205
Measured from: -2.52799993753433
to: 6.01600003242493 [s; relative to TRIGTIME]
T50: 4.01199990510941 +/- 2.1766506682935
Measured from: -0.679999887943268
to: 3.33200001716614 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.11599999666214
to: 3.11599999666214 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.88400000333786
to: 6.28799998760223 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.066569 0.109263 0.080322 0.018593
0.013822 0.014419 0.012851 0.011006 [error]
Peak 0.009190 0.022718 0.012328 0.007059
0.004630 0.004759 0.004311 0.003677 [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 1.80e-08 3.88e-08 6.58e-08 2.56e-07 1.81e-07 3.78e-07 erg/cm2
Error 4.95e-09 6.36e-09 1.22e-08 1.07e-07 3.05e-08 1.15e-07 erg/cm2
Peak flux Power-law 1.03e-01 1.21e-01 1.03e-01 1.47e-01 3.79e-01 4.74e-01 ph/cm2/s
Error 5.43e-02 3.81e-02 3.48e-02 1.13e-01 1.05e-01 1.42e-01 ph/cm2/s
Fluence Cutoff-PL 1.69e-08 3.98e-08 6.76e-08 1.65e-07 1.77e-07 2.93e-07 erg/cm2
Error 6.01e-09 7.23e-09 1.38e-08 3.25e-08 1.63e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.03e-01 1.21e-01 1.03e-01 1.46e-01 3.79e-01 4.71e-01 ph/cm2/s
Error 5.40e-02 2.88e-02 3.48e-02 1.21e-01 1.05e-01 1.40e-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 1.240 0.266 - - 1.96e-03 2.90e-04 59.750 57
CPL 0.941 0.873 192.6 0.0 2.71e-03 3.81e-03 59.490 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.240 0.535 - - 3.21e-03 8.80e-04 69.310 57
CPL 1.250 0.538 9999.4 0.0 3.21e-03 5.66e-03 69.310 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: 5.888000 sec.
T50 in the 50-300 keV band: 3.456000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 9.172 -2.884 6.288
T90 8.544 -2.528 6.016
T50 4.012 -0.680 3.332
Peak 1.000 2.116 3.116
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
164.0545 +53.8145 0.0187 10.7 -140.2 0.2732 10.3 TRIG_00501520
------------------------------------------
Foreground time interval of the image:
-2.884 6.288 (delta_t = 9.172 [sec])
Background time interval of the image:
-239.808 -57.558 (delta_t = 182.250 [sec])
-56.808 -2.884 (delta_t = 53.924 [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 -2.884 sec. to 6.288 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23994 ( -0.266661 0.26553 )
Norm@50keV : 1.96202E-03 ( -0.000290382 0.000290025 )
------------------------------------------------------------
# Chi-Squared = 59.75 using 59 PHA bins.
# Reduced chi-squared = 1.048 for 57 degrees of freedom
# Null hypothesis probability = 3.759261e-01
Photon flux (15-150 keV) in 9.172 sec: 0.231680 ( -0.034768 0.0348545 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80583e-07 ( -3.02803e-08 3.07212e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.884 sec. to 6.288 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.940815 ( -1.19716 0.548508 )
Epeak [keV] : 192.554 ( -192.559 -192.559 )
Norm@50keV : 2.71131E-03 ( -0.00101456 0.00659904 )
------------------------------------------------------------
# Chi-Squared = 59.49 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 56 degrees of freedom
# Null hypothesis probability = 3.497560e-01
Photon flux (15-150 keV) in 9.172 sec: 0.228416 ( -0.036582 0.036219 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.77375e-07 ( -3.2501e-08 3.24661e-08 ) ergs/cm2
Band function
Time interval is from -2.884 sec. to 6.288 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.941194 ( 0.766985 1.02216 )
beta : -10.00000 ( 1.33879e+11 1.33879e+11 )
Epeak [keV] : 192.614 ( -115.635 -192.553 )
Norm@50keV : 2.71026E-03 ( -0.00101795 0.00660228 )
------------------------------------------------------------
# Chi-Squared = 59.49 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 55 degrees of freedom
# Null hypothesis probability = 3.155179e-01
Photon flux (15-150 keV) in 9.172 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] : 18.8587 (-3.42895 4.43506)
R^2/D10^2 : 1.27975E-02 (-0.00633368 0.011992)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 67.39 using 59 PHA bins.
# Reduced chi-squared = 1.182 for 57 degrees of freedom
# Null hypothesis probability = 1.632543e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.228e-09 2.644e-09
25- 50 3.937e-08 1.047e-08
50-150 1.027e-07 2.916e-08
15-150 1.503e-07 3.462e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.998 ( )
Norm : 0.951105 (-0.951105 -0.951105)
------------------------------------------------------------
# Chi-Squared = 63.45 using 59 PHA bins.
# Reduced chi-squared = 1.113 for 57 degrees of freedom
# Null hypothesis probability = 2.596860e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.172e-08 1.186e-08
25- 50 4.177e-08 2.293e-08
50-150 9.162e-08 5.054e-08
15-150 1.551e-07 8.406e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.43297 (-1.4918 6.55547)
R1^2/D10^2 : 25.6529 (-25.6007 202432)
kT2 [keV] : 21.3771 (-4.23053 17.993)
R2^2/D10^2 : 8.15735E-03 (-0.00719894 0.00828682)
------------------------------------------------------------
# Chi-Squared = 58.65 using 59 PHA bins.
# Reduced chi-squared = 1.066 for 55 degrees of freedom
# Null hypothesis probability = 3.430053e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.698e-08 7.220e-09
25- 50 3.401e-08 1.055e-08
50-150 1.136e-07 3.816e-08
15-150 1.646e-07 4.403e-08
Peak spectrum fit
Power-law model
Time interval is from 2.116 sec. to 3.116 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24014 ( -0.540972 0.528276 )
Norm@50keV : 3.21323E-03 ( -0.000883006 0.000877213 )
------------------------------------------------------------
# Chi-Squared = 69.31 using 59 PHA bins.
# Reduced chi-squared = 1.216 for 57 degrees of freedom
# Null hypothesis probability = 1.271086e-01
Photon flux (15-150 keV) in 1 sec: 0.379439 ( -0.104838 0.105019 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.22418e-08 ( -1.01061e-08 1.03726e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.116 sec. to 3.116 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24960 ( -0.557377 0.519372 )
Epeak [keV] : 9999.36 ( -9996.52 -9996.52 )
Norm@50keV : 3.21013E-03 ( -0.000887935 0.0104293 )
------------------------------------------------------------
# Chi-Squared = 69.31 using 59 PHA bins.
# Reduced chi-squared = 1.238 for 56 degrees of freedom
# Null hypothesis probability = 1.089620e-01
Photon flux (15-150 keV) in 1 sec: 0.379323 ( -0.104776 0.104856 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.20328e-08 ( -9.871e-09 1.05871e-08 ) ergs/cm2
Band function
Time interval is from 2.116 sec. to 3.116 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.01441 ( 1.01441 1.01441 )
beta : -1.24004 ( 1.24004 0.540913 )
Epeak [keV] : 41.6841 ( -41.6845 -41.6845 )
Norm@50keV : 5.85096E-03 ( -0.00351085 0 )
------------------------------------------------------------
# Chi-Squared = 69.31 using 59 PHA bins.
# Reduced chi-squared = 1.260 for 55 degrees of freedom
# Null hypothesis probability = 9.286042e-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] : 19.1234 (-7.30469 13.3752)
R^2/D10^2 : 1.93229E-02 (-0.0191935 0.0749069)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 74.41 using 59 PHA bins.
# Reduced chi-squared = 1.305 for 57 degrees of freedom
# Null hypothesis probability = 6.054817e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.386e-09 7.963e-10
25- 50 6.695e-09 4.105e-09
50-150 1.802e-08 1.169e-08
15-150 2.610e-08 1.574e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-110.78 -199.979)
Norm : 1.54737 (-0.428623 0.428634)
------------------------------------------------------------
# Chi-Squared = 70.66 using 59 PHA bins.
# Reduced chi-squared = 1.240 for 57 degrees of freedom
# Null hypothesis probability = 1.055530e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.853e-09 2.304e-09
25- 50 7.412e-09 4.422e-09
50-150 1.626e-08 9.545e-09
15-150 2.752e-08 1.693e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.04664 (-5.88884 8.53315)
R1^2/D10^2 : 0.382331 (-0.351086 21.7885)
kT2 [keV] : 39.9473 (-38.8087 -39.9633)
R2^2/D10^2 : 1.72966E-03 (-0.00168668 0.0215597)
------------------------------------------------------------
# Chi-Squared = 69.27 using 59 PHA bins.
# Reduced chi-squared = 1.260 for 55 degrees of freedom
# Null hypothesis probability = 9.331621e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.427e-09 2.102e-09
25- 50 6.690e-09 3.791e-09
50-150 2.392e-08 1.335e-08
15-150 3.404e-08 1.702e-08
Plot creation:
Sat Aug 27 16:07:43 EDT 2011