batgrbproduct Analysis for Trigger=609885
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): Tue Aug 19 10:31:57 EDT 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger609885/batgroup_hand_proc
======================================================================
Trigger: 00609885 Segment: 000
BAT Trigger Time: 430080268.928 [s; MET]
Trigger Stop: 430080270.976 [s; MET]
UTC: 2014-08-18T18:44:16.515620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 271.147889570597 Dec: -1.36139902602599 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.63
Image Trigger?: NO
Rate S/N Ratio: 10.8627804912002 [ if not an image trigger ]
Image S/N Ratio: 7.63
Flight Position: [ source = BAT ]
RA: 271.147889570597 Dec: -1.36139902602599 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 271.167604642497 Dec: -1.35397240941011 [deg; J2000]
{ 18h 04m 40.2s , -01d 21' 14.3" }
+/- 2.12666865584545 [arcmin] (estimated 90% radius based on SNR)
+/- 0.939416704457446 [arcmin] (formal 1-sigma fit error)
SNR: 10.3508440502307
Angular difference between Flight and Ground position is 1.263738 arcmin
Partial Coding Fraction: 0.3945312 [ including projection effects ]
Duration
T90: 18.1119999885559 +/- 4.97731168703682
Measured from: -3.06399995088577
to: 15.0480000376701 [s; relative to TRIGTIME]
T50: 6.52799999713898 +/- 4.58170269612096
Measured from: -1.20799994468689
to: 5.32000005245209 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.308000028133392
to: 1.30800002813339 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.51199996471405
to: 18.0560000538826 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.338131 0.356662 0.185816 0.023338
0.048727 0.042829 0.035600 0.028975 [error]
Peak 0.031587 0.040928 0.040395 0.005189
0.010665 0.009739 0.008265 0.006361 [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 1.19e-07 1.63e-07 1.64e-07 2.99e-07 5.42e-07 7.45e-07 erg/cm2
Error 2.41e-08 2.17e-08 3.52e-08 1.30e-07 8.18e-08 1.66e-07 erg/cm2
Peak flux Power-law 3.84e-01 3.56e-01 2.29e-01 2.27e-01 1.06e+00 1.20e+00 ph/cm2/s
Error 1.46e-01 8.81e-02 6.52e-02 1.27e-01 2.56e-01 2.76e-01 ph/cm2/s
Fluence Cutoff-PL 1.15e-07 1.69e-07 1.63e-07 1.70e-07 5.26e-07 6.18e-07 erg/cm2
Error 2.69e-08 2.88e-08 3.88e-08 2.18e-07 9.57e-08 2.34e-07 erg/cm2
Peak flux Cutoff-PL 2.93e-01 3.97e-01 2.59e-01 7.81e-02 1.01e+00 1.03e+00 ph/cm2/s
Error 1.73e-01 1.07e-01 8.13e-02 1.41e-01 2.64e-01 2.81e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.990 0.250 - - 2.73e-03 4.29e-04 65.960 57
CPL 1.668 0.898 44.6 0.0 4.14e-03 0.00e+00 65.680 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 1.637 0.377 - - 8.18e-03 1.93e-03 43.890 57
CPL 0.280 1.863 65.1 -24.8 3.81e-02 2.05e-01 41.710 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: 8.512000 sec.
T50 in the 50-300 keV band: 4.032000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 21.568 -3.512 18.056
T90 18.112 -3.064 15.048
T50 6.528 -1.208 5.320
Peak 1.000 0.308 1.308
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
271.1676 -1.3540 0.0186 38.2075 23.2902 0.9095291 10.351 TRIG_00609885
Foreground time interval of the image:
-3.512 18.056 (delta_t = 21.568 [sec])
Background time interval of the image:
-239.928 -3.512 (delta_t = 236.416 [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 -3.512 sec. to 18.056 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99006 ( -0.24351 0.257046 )
Norm@50keV : 2.72741E-03 ( -0.000434549 0.000423093 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.96 using 59 PHA bins.
# Reduced chi-squared = 1.157 for 57 degrees of freedom
# Null hypothesis probability = 1.947461e-01
Photon flux (15-150 keV) in 21.57 sec: 0.407253 ( -0.0555664 0.0556945 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.4225e-07 ( -8.11422e-08 8.24645e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.512 sec. to 18.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66846 ( -1.30798 0.487803 )
Epeak [keV] : 44.5979 ( )
Norm@50keV : 4.14247E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.68 using 59 PHA bins.
# Reduced chi-squared = 1.173 for 56 degrees of freedom
# Null hypothesis probability = 1.764756e-01
Photon flux (15-150 keV) in 21.57 sec: 0.401746 ( -0.058476 0.058187 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.25902e-07 ( -9.68946e-08 9.4468e-08 ) ergs/cm2
Band function
Time interval is from -3.512 sec. to 18.056 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.12561 ( -2.12844 -2.12844 )
beta : -2.12470 ( 2.12638 0.30005 )
Epeak [keV] : 24.9518 ( -25.0305 66.1613 )
Norm@50keV : 3.24928 ( -3.25729 233.901 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.74 using 59 PHA bins.
# Reduced chi-squared = 1.177 for 55 degrees of freedom
# Null hypothesis probability = 1.731360e-01
Photon flux (15-150 keV) in 21.57 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] : 10.1784 (-1.51094 1.78276)
R^2/D10^2 : 0.174474 (-0.0813886 0.151891)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.27 using 59 PHA bins.
# Reduced chi-squared = 1.338 for 57 degrees of freedom
# Null hypothesis probability = 4.501662e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.987e-08 2.263e-08
25- 50 2.036e-07 4.311e-08
50-150 1.118e-07 3.924e-08
15-150 3.952e-07 7.938e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 69.6529 (-23.5197 46.2939)
Norm : 1.99348 (-0.412421 0.526408)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.91 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 57 degrees of freedom
# Null hypothesis probability = 1.959869e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.103e-07 2.139e-08
25- 50 1.752e-07 2.502e-08
50-150 2.242e-07 8.625e-08
15-150 5.096e-07 1.102e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.82012 (-3.19135 2.7287)
R1^2/D10^2 : 0.414434 (-0.238309 0.686792)
kT2 [keV] : 38.8338 (-25.192 -39.6488)
R2^2/D10^2 : 7.89167E-04 (-0.000722336 0.0337003)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.37 using 59 PHA bins.
# Reduced chi-squared = 1.189 for 55 degrees of freedom
# Null hypothesis probability = 1.597329e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.005e-07 4.111e-08
25- 50 1.863e-07 7.666e-08
50-150 2.505e-07 1.373e-07
15-150 5.373e-07 2.122e-07
Peak spectrum fit
Power-law model
Time interval is from 0.308 sec. to 1.308 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63693 ( -0.371853 0.382669 )
Norm@50keV : 8.17853E-03 ( -0.00193926 0.00192423 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.89 using 59 PHA bins.
# Reduced chi-squared = 0.7699 for 57 degrees of freedom
# Null hypothesis probability = 8.986431e-01
Photon flux (15-150 keV) in 1 sec: 1.06335 ( -0.255464 0.257454 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.61669e-08 ( -1.86708e-08 1.89044e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.308 sec. to 1.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.279736 ( -2.2294 1.49703 )
Epeak [keV] : 65.1421 ( -15.5842 -65.14 )
Norm@50keV : 3.80684E-02 ( -0.0380736 0.37115 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.71 using 59 PHA bins.
# Reduced chi-squared = 0.7449 for 56 degrees of freedom
# Null hypothesis probability = 9.223775e-01
Photon flux (15-150 keV) in 1 sec: 1.00790 ( -0.262213 0.26533 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.18909e-08 ( -1.87175e-08 1.94499e-08 ) ergs/cm2
Band function
Time interval is from 0.308 sec. to 1.308 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.278331 ( -1.11401 2.61932 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 65.1060 ( -19.4294 112.908 )
Norm@50keV : 3.81377E-02 ( -0.0381377 0.372895 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.71 using 59 PHA bins.
# Reduced chi-squared = 0.7584 for 55 degrees of freedom
# Null hypothesis probability = 9.068001e-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] : 15.2295 (-3.38093 4.26801)
R^2/D10^2 : 0.117019 (-0.0702861 0.173042)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.56 using 59 PHA bins.
# Reduced chi-squared = 0.7643 for 57 degrees of freedom
# Null hypothesis probability = 9.048530e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.668e-09 2.829e-09
25- 50 2.283e-08 9.106e-09
50-150 3.628e-08 1.719e-08
15-150 6.479e-08 2.263e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 157.661 (-88.2845 -155.033)
Norm : 4.42109 (-1.08221 1.57337)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.76 using 59 PHA bins.
# Reduced chi-squared = 0.7502 for 57 degrees of freedom
# Null hypothesis probability = 9.192956e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.130e-08 6.710e-09
25- 50 2.110e-08 1.187e-08
50-150 4.251e-08 2.575e-08
15-150 7.491e-08 4.373e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.80057 (-5.90484 -5.90484)
R1^2/D10^2 : 1.60844 (-1.50937 5.49851)
kT2 [keV] : 18.8480 (-5.54382 -18.987)
R2^2/D10^2 : 4.55884E-02 (-0.0439404 0.133519)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.11 using 59 PHA bins.
# Reduced chi-squared = 0.7475 for 55 degrees of freedom
# Null hypothesis probability = 9.178517e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.003e-08 6.055e-09
25- 50 2.160e-08 1.168e-08
50-150 4.030e-08 2.538e-08
15-150 7.193e-08 3.972e-08
Plot creation:
Tue Aug 19 10:37:46 EDT 2014