batgrbproduct Analysis for Trigger=578227
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): Thu Nov 21 09:09:47 EST 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger578227/batgroup_hand_proc
======================================================================
Trigger: 00578227 Segment: 000
BAT Trigger Time: 406651088 [s; MET]
Trigger Stop: 406651152 [s; MET]
UTC: 2013-11-20T14:37:56.703060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 278.921458952195 Dec: -11.9973317222608 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.8
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.8
Flight Position: [ source = BAT ]
RA: 278.921458952195 Dec: -11.9973317222608 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 278.93655286231 Dec: -12.0263300152142 [deg; J2000]
{ 18h 35m 44.8s , -12d 01' 34.8" }
+/- 3.00687671013473 [arcmin] (estimated 90% radius based on SNR)
+/- 2.03847465637217 [arcmin] (formal 1-sigma fit error)
SNR: 6.3109692474509
Angular difference between Flight and Ground position is 1.952407 arcmin
Partial Coding Fraction: 0.5078125 [ including projection effects ]
Duration
T90: 130.512000024319 +/- 20.1170796934072
Measured from: -68.4079999923706
to: 62.1040000319481 [s; relative to TRIGTIME]
T50: 80.3360000252724 +/- 16.091253792986
Measured from: -30.4399999976158
to: 49.8960000276566 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 49.4039999842644
to: 50.4039999842644 [s; relative to TRIGTIME]
Total Fluence
Measured from: -71.0640000104904
to: 64.311999976635 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.733814 0.439819 0.080254 -0.048098
0.098997 0.094358 0.080963 0.071746 [error]
Peak 0.022174 0.023898 0.008212 0.008622
0.008596 0.008022 0.007096 0.005795 [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 2.46e-07 1.91e-07 9.95e-08 7.50e-08 5.71e-07 6.11e-07 erg/cm2
Error 5.43e-08 5.24e-08 5.57e-08 9.01e-08 1.46e-07 1.86e-07 erg/cm2
Peak flux Power-law 2.31e-01 1.81e-01 9.55e-02 7.29e-02 5.41e-01 5.81e-01 ph/cm2/s
Error 1.36e-01 7.10e-02 5.75e-02 1.00e-01 2.14e-01 2.28e-01 ph/cm2/s
Fluence Cutoff-PL 2.44e-07 2.18e-07 3.20e-08 3.16e-10 4.94e-07 4.94e-07 erg/cm2
Error 5.97e-08 6.94e-08 6.19e-08 3.36e-08 1.28e-07 1.39e-07 erg/cm2
Peak flux Cutoff-PL 2.34e-01 1.81e-01 9.46e-02 7.12e-02 5.42e-01 5.81e-01 ph/cm2/s
Error 1.37e-01 8.02e-02 7.72e-02 8.57e-02 2.14e-01 2.27e-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 2.940 0.504 - - 3.60e-04 1.52e-04 52.370 57
CPL 0.708 0.000 16.9 0.0 1.35e-02 0.00e+00 49.950 56
The chi2 of BB fit is Chi-Squared Chi-Squared 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 1.925 0.794 - - 3.73e-03 1.76e-03 38.270 57
CPL 1.934 3.275 321.0 0.0 3.69e-03 0.00e+00 38.270 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 135.376 -71.064 64.312
T90 130.512 -68.408 62.104
T50 80.336 -30.440 49.896
Peak 1.000 49.404 50.404
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
278.9366 -12.0263 0.0305 38.0524 -33.9559 1.4582093 6.311 TRIG_00578227
Foreground time interval of the image:
-71.064 64.312 (delta_t = 135.376 [sec])
Background time interval of the image:
-466.799 -444.850 (delta_t = 21.949 [sec])
-239.000 -71.064 (delta_t = 167.936 [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 -71.064 sec. to 64.312 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.94037 ( -0.452396 0.554732 )
Norm@50keV : 3.60378E-04 ( -0.000145991 0.000157697 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.37 using 59 PHA bins.
# Reduced chi-squared = 0.9189 for 57 degrees of freedom
# Null hypothesis probability = 6.489743e-01
Photon flux (15-150 keV) in 135.4 sec: 9.49318E-02 ( -0.0189602 0.0189913 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.70773e-07 ( -1.40314e-07 1.52121e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -71.064 sec. to 64.312 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.707682 ( )
Epeak [keV] : 16.9118 ( )
Norm@50keV : 1.34762E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.95 using 59 PHA bins.
# Reduced chi-squared = 0.8920 for 56 degrees of freedom
# Null hypothesis probability = 7.019805e-01
Photon flux (15-150 keV) in 135.4 sec: 9.18018E-02 ( -0.0184495 0.0184472 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.94104e-07 ( -1.10444e-07 1.46241e-07 ) ergs/cm2
Band function
Time interval is from -71.064 sec. to 64.312 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.410004 ( -3.78418 0.718441 )
beta : -5.74930 ( 9.37167 19.3701 )
Epeak [keV] : 20.9114 ( -4.81146 9.84767 )
Norm@50keV : 8.17275E-02 ( -0.0817256 207.36 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.76 using 59 PHA bins.
# Reduced chi-squared = 0.9047 for 55 degrees of freedom
# Null hypothesis probability = 6.744564e-01
Photon flux (15-150 keV) in 135.4 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] : 5.81447 (-1.0569 1.22827)
R^2/D10^2 : 0.408761 (-0.234487 0.607089)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.18 using 59 PHA bins.
# Reduced chi-squared = 0.8803 for 57 degrees of freedom
# Null hypothesis probability = 7.268789e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.373e-07 9.525e-08
25- 50 2.209e-07 1.007e-07
50-150 1.775e-08 1.357e-08
15-150 4.759e-07 2.255e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 19.1689 (-6.4337 10.6251)
Norm : 1.22290 (-0.486599 0.862739)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.26 using 59 PHA bins.
# Reduced chi-squared = 0.8818 for 57 degrees of freedom
# Null hypothesis probability = 7.239195e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.475e-07 6.966e-08
25- 50 2.096e-07 8.056e-08
50-150 5.841e-08 4.409e-08
15-150 5.156e-07 1.763e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.67276 (-2.32908 26.9151)
R1^2/D10^2 : 142.665 ( )
kT2 [keV] : 6.29502 (-1.3453 -6.29764)
R2^2/D10^2 : 0.267710 (-0.266509 0.577293)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.35 using 59 PHA bins.
#Fit statistic : Chi-Squared = 49.23 using 59 PHA bins.
# Reduced chi-squared = 0.8972 for 55 degrees of freedom
# Reduced chi-squared = 0.8951 for 55 degrees of freedom
# Null hypothesis probability = 6.894875e-01
# Null hypothesis probability = 6.937899e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.402e-07 1.240e-07
25- 50 2.243e-07 1.304e-07
50-150 2.795e-08 1.837e-08
15-150 4.924e-07 2.600e-07
Peak spectrum fit
Power-law model
Time interval is from 49.404 sec. to 50.404 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92511 ( -0.74031 0.847804 )
Norm@50keV : 3.73250E-03 ( -0.00183276 0.00168758 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.27 using 59 PHA bins.
# Reduced chi-squared = 0.6714 for 57 degrees of freedom
# Null hypothesis probability = 9.732191e-01
Photon flux (15-150 keV) in 1 sec: 0.541454 ( -0.213686 0.214245 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.43274e-08 ( -1.51701e-08 1.60652e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 49.404 sec. to 50.404 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.93433 ( -5.06482 1.4856 )
Epeak [keV] : 321.000 ( )
Norm@50keV : 3.69161E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.27 using 59 PHA bins.
# Reduced chi-squared = 0.6834 for 56 degrees of freedom
# Null hypothesis probability = 9.663300e-01
Photon flux (15-150 keV) in 1 sec: 0.542291 ( -0.214342 0.213178 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.41221e-08 ( -3.41221e-08 1.59904e-08 ) ergs/cm2
Band function
Time interval is from 49.404 sec. to 50.404 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -2.17515 ( 2.17337 0.883931 )
Epeak [keV] : 23.9746 ( -23.9279 62.1225 )
Norm@50keV : 797.082 ( -309.144 9.15974e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.66 using 59 PHA bins.
# Reduced chi-squared = 0.6847 for 55 degrees of freedom
# Null hypothesis probability = 9.643109e-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] : 8.09271 (-2.72807 5.33443)
R^2/D10^2 : 0.570959 (-0.570951 2.47252)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.37 using 59 PHA bins.
# Reduced chi-squared = 0.6906 for 57 degrees of freedom
# Null hypothesis probability = 9.638422e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.819e-09 4.266e-09
25- 50 1.217e-08 8.180e-09
50-150 3.320e-09 3.047e-09
15-150 2.231e-08 1.539e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 73.6794 (-73.7501 -73.7501)
Norm : 2.59750 (-1.26688 3.53328)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.55 using 59 PHA bins.
# Reduced chi-squared = 0.6764 for 57 degrees of freedom
# Null hypothesis probability = 9.709772e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.698e-09 4.331e-09
25- 50 1.080e-08 6.915e-09
50-150 1.440e-08 1.267e-08
15-150 3.190e-08 2.297e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.22010 (-1.71546 3.70783)
R1^2/D10^2 : 0.838617 (-0.660887 5.0187)
kT2 [keV] : 171.359 (-171.234 -171.234)
R2^2/D10^2 : 7.50766E-05 (-7.04216e-05 0.0848208)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.39 using 59 PHA bins.
# Reduced chi-squared = 0.6617 for 55 degrees of freedom
# Null hypothesis probability = 9.750488e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.326e-09 4.735e-09
25- 50 1.122e-08 7.440e-09
50-150 1.818e-08 3.236e-09
15-150 3.672e-08 1.477e-08
Plot creation:
Thu Nov 21 10:12:49 EST 2013