batgrbproduct Analysis for Trigger=502934
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): Mon Sep 12 17:26:20 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger502934/GCN5_download_cron
======================================================================
Trigger: 00502934 Segment: 000
BAT Trigger Time: 337483472 [s; MET]
Trigger Stop: 337483536 [s; MET]
UTC: 2011-09-12T01:24:24.644240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 195.312965175714 Dec: -61.603034485383 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 24
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 24
Flight Position: [ source = BAT ]
RA: 195.312965175714 Dec: -61.603034485383 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 195.347128698388 Dec: -61.5462824343362 [deg; J2000]
{ 13h 01m 23.3s , -61d 32' 46.6" }
+/- 3.30754503308806 [arcmin] (estimated 90% radius based on SNR)
+/- 1.75238068892128 [arcmin] (formal 1-sigma fit error)
SNR: 5.50766207147278
Angular difference between Flight and Ground position is 3.542164 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 685.427999913692 +/- 118.386906129562
Measured from: -65.7879998683929
to: 619.6400000453 [s; relative to TRIGTIME]
T50: 285.099999964237 +/- 21.7986880892129
Measured from: 53.9480001330376
to: 339.048000097275 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 65.9800000190735
to: 66.9800000190735 [s; relative to TRIGTIME]
Total Fluence
Measured from: -122.635999977589
to: 772.560000002384 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 21.652175 15.331922 0.866014 0.002638
0.160211 0.159207 0.136327 0.126970 [error]
Peak 0.065595 0.045002 0.006108 0.009384
0.005882 0.005744 0.004610 0.004359 [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 6.12e-01 3.00e-01 9.00e-02 3.42e-02 1.02e+00 1.04e+00 ph/cm2/s
Error 9.44e-02 4.89e-02 2.94e-02 1.96e-02 1.37e-01 1.41e-01 ph/cm2/s
Fluence Cutoff-PL 6.09e-06 6.49e-06 5.85e-07 8.14e-10 1.32e-05 1.32e-05 erg/cm2
Error 4.75e-07 1.77e-07 8.58e-08 6.60e-10 5.29e-07 5.29e-07 erg/cm2
Peak flux Cutoff-PL 6.07e-01 3.70e-01 1.00e-02 9.80e-07 9.87e-01 9.87e-01 ph/cm2/s
Error 1.08e-01 7.12e-02 1.51e-02 5.25e-05 1.32e-01 1.32e-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 3.527 0.000 - - 1.20e-03 0.00e+00 448.090 57
CPL -2.177 0.702 24.4 1.2 4.97e+00 6.36e+00 60.950 56
The chi2 of BB fit is 60.94 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 2.736 0.301 - - 4.46e-03 1.13e-03 67.680 57
CPL 1.000 0.000 50.0 0.0 1.91e-02 0.00e+00 101.460 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 895.196 -122.636 772.560
T90 685.428 -65.788 619.640
T50 285.100 53.948 339.048
Peak 1.000 65.980 66.980
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
195.3471 -61.5463 0.0348 15.9 12.3 4.4749 5.5 TRIG_00502934
------------------------------------------
Foreground time interval of the image:
-122.636 150.410 (delta_t = 273.046 [sec])
151.000 202.870 (delta_t = 51.870 [sec])
204.000 511.690 (delta_t = 307.690 [sec])
513.000 515.590 (delta_t = 2.590 [sec])
517.000 627.130 (delta_t = 110.130 [sec])
628.000 772.560 (delta_t = 144.560 [sec])
Background time interval of the image:
-239.000 -122.636 (delta_t = 116.364 [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
-122.636000 150.410000
151.000000 202.870000
204.000000 511.690000
513.000000 515.590000
517.000000 627.130000
628.000000 772.560000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.52711 ( )
Norm@50keV : 1.19629E-03 ( )
------------------------------------------------------------
# Chi-Squared = 448.09 using 59 PHA bins.
# Reduced chi-squared = 7.8613 for 57 degrees of freedom
# Null hypothesis probability = 4.265114e-62
Photon flux (15-150 keV) in 889.9 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
-122.636000 150.410000
151.000000 202.870000
204.000000 511.690000
513.000000 515.590000
517.000000 627.130000
628.000000 772.560000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.17704 ( -0.744161 0.659532 )
Epeak [keV] : 24.4062 ( -1.24245 1.11496 )
Norm@50keV : 4.96978 ( -3.118 9.60714 )
------------------------------------------------------------
# Chi-Squared = 60.95 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 56 degrees of freedom
# Null hypothesis probability = 3.024337e-01
Photon flux (15-150 keV) in 889.9 sec: 0.366164 ( -0.01858 0.018971 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31681e-05 ( -5.25041e-07 5.32516e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-122.636000 150.410000
151.000000 202.870000
204.000000 511.690000
513.000000 515.590000
517.000000 627.130000
628.000000 772.560000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.27360 ( -0.484152 1.05538 )
beta : -7.50387 ( 6.07296 -0.066641 )
Epeak [keV] : 24.5180 ( -1.29035 1.07299 )
Norm@50keV : 5.75072 ( -5.74623 11.1658 )
------------------------------------------------------------
# Chi-Squared = 60.52 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 55 degrees of freedom
# Null hypothesis probability = 2.832880e-01
Photon flux (15-150 keV) in 889.9 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] : 6.06790 (-0.118015 0.120694)
R^2/D10^2 : 1.42888 (-0.145688 0.16192)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 60.94 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 57 degrees of freedom
# Null hypothesis probability = 3.361022e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.321e-06 2.808e-07
25- 50 6.459e-06 1.602e-07
50-150 6.193e-07 5.606e-08
15-150 1.340e-05 3.560e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.6755 ( )
Norm : 7.68321 ( )
------------------------------------------------------------
# Chi-Squared = 167.32 using 59 PHA bins.
# Reduced chi-squared = 2.9354 for 57 degrees of freedom
# Null hypothesis probability = 8.861821e-13
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.355e-06 3.448e-07
25- 50 5.941e-06 1.535e-07
50-150 1.143e-06 1.023e-07
15-150 1.544e-05 4.183e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.861185 (-6.06806 -6.06806)
R1^2/D10^2 : 5.35729E+05 ( )
kT2 [keV] : 6.07959 (-0.12011 4.09267)
R2^2/D10^2 : 1.41244 (-1.41242 0.152976)
------------------------------------------------------------
# Chi-Squared = 60.94 using 59 PHA bins.
# Chi-Squared = 60.15 using 59 PHA bins.
# Reduced chi-squared = 1.108 for 55 degrees of freedom
# Reduced chi-squared = 1.094 for 55 degrees of freedom
# Null hypothesis probability = 2.708071e-01
# Null hypothesis probability = 2.947025e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.321e-06 3.492e+02
25- 50 6.459e-06 2.909e+03
50-150 6.193e-07 6.434e+04
15-150 1.340e-05 7.133e+04
Peak spectrum fit
Power-law model
Time interval is from 65.980 sec. to 66.980 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.73637 ( -0.285966 0.316077 )
Norm@50keV : 4.46392E-03 ( -0.00111034 0.0011518 )
------------------------------------------------------------
# Chi-Squared = 67.68 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 57 degrees of freedom
# Null hypothesis probability = 1.572559e-01
Photon flux (15-150 keV) in 1 sec: 1.02073 ( -0.137418 0.137524 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.81081e-08 ( -8.06018e-09 8.4872e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 65.980 sec. to 66.980 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.90840E-02 ( )
------------------------------------------------------------
# Chi-Squared = 101.46 using 59 PHA bins.
# Reduced chi-squared = 1.8119 for 56 degrees of freedom
# Null hypothesis probability = 1.929087e-04
Photon flux (15-150 keV) in 1 sec: 0.987047 ( -0.131704 0.131653 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.88792e-08 ( -5.4866e-09 5.6964e-09 ) ergs/cm2
Band function
Time interval is from 65.980 sec. to 66.980 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.51777 ( -12.8155 -4.75355 )
beta : -6.75842 ( 5.65842 2.05439 )
Epeak [keV] : 24.2364 ( -2.78868 2.20548 )
Norm@50keV : 148.840 ( -154.461 569.472 )
------------------------------------------------------------
# Chi-Squared = 51.96 using 59 PHA bins.
# Reduced chi-squared = 0.9446 for 55 degrees of freedom
# Null hypothesis probability = 5.916995e-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] : 5.92813 (-0.625159 0.683921)
R^2/D10^2 : 4.22479 (-1.6312 2.70799)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 52.99 using 59 PHA bins.
# Reduced chi-squared = 0.9296 for 57 degrees of freedom
# Null hypothesis probability = 6.264011e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.939e-08 3.680e-09
25- 50 1.883e-08 4.605e-09
50-150 1.641e-09 8.845e-10
15-150 3.985e-08 7.435e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 20.4809 (-4.55383 6.46248)
Norm : 12.2462 (-3.30354 4.64578)
------------------------------------------------------------
# Chi-Squared = 61.04 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 57 degrees of freedom
# Null hypothesis probability = 3.327768e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.937e-08 3.520e-09
25- 50 1.728e-08 3.950e-09
50-150 5.384e-09 2.790e-09
15-150 4.204e-08 7.550e-09
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.984 ( )
R1^2/D10^2 : 6.48363E-05 (-4.3536e-05 4.34491e-05)
kT2 [keV] : 5.73947 (-0.610715 0.666115)
R2^2/D10^2 : 4.75217 (-1.85012 3.10859)
------------------------------------------------------------
# Chi-Squared = 52.99 using 59 PHA bins.
# Chi-Squared = 46.99 using 59 PHA bins.
# Reduced chi-squared = 0.9634 for 55 degrees of freedom
# Reduced chi-squared = 0.8544 for 55 degrees of freedom
# Null hypothesis probability = 5.519730e-01
# Null hypothesis probability = 7.703334e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.938e-08 4.679e-01
25- 50 1.884e-08 3.747e+00
50-150 1.643e-09 9.120e+01
15-150 3.986e-08 9.255e+01
Plot creation:
Mon Sep 12 17:42:59 EDT 2011