batgrbproduct Analysis for Trigger=635887
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 Mar 23 14:57:06 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger635887/batgroup_hand_proc
======================================================================
Trigger: 00635887 Segment: 000
BAT Trigger Time: 448771764 [s; MET]
Trigger Stop: 448771782 [s; MET]
UTC: 2015-03-23T02:49:10.653860 [includes UTCF correction]
Where From?: Command line
BAT
RA: 128.191265245984 Dec: 45.4343019594773 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.18
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.18
Flight Position: [ source = EXTERNAL ]
RA: 128.173 Dec: 45.4416 [deg; J2000]
Partial Coding Fraction: 0.328125 [ including projection effects ]
Angular difference between Flight and Ground position is 0.000000 arcmin
Partial Coding Fraction: 0.328125 [ including projection effects ]
Duration
T90: 149.5759999156 +/- 8.92164313190198
Measured from: 7.50800013542175
to: 157.084000051022 [s; relative to TRIGTIME]
T50: 12.6679999232292 +/- 1.04837398185967
Measured from: 128.632000148296
to: 141.300000071526 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 135.639999985695
to: 136.639999985695 [s; relative to TRIGTIME]
Total Fluence
Measured from: 2.59200000762939
to: 195.407999992371 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.353903 3.650897 2.400393 0.542941
0.111614 0.115934 0.100252 0.083712 [error]
Peak 0.203992 0.211837 0.133711 0.025361
0.008318 0.008345 0.007223 0.004761 [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 1.17e-06 1.74e-06 1.93e-06 4.02e-06 6.06e-06 8.86e-06 erg/cm2
Error 8.05e-08 6.98e-08 1.04e-07 4.72e-07 2.45e-07 5.48e-07 erg/cm2
Peak flux Power-law 2.40e+00 1.82e+00 9.15e-01 6.61e-01 5.44e+00 5.80e+00 ph/cm2/s
Error 1.93e-01 8.80e-02 6.24e-02 9.09e-02 2.75e-01 2.75e-01 ph/cm2/s
Fluence Cutoff-PL 1.12e-06 1.77e-06 1.95e-06 2.95e-06 5.96e-06 7.79e-06 erg/cm2
Error 1.02e-07 8.04e-08 1.11e-07 -------- 2.76e-07 8.70e-07 erg/cm2
Peak flux Cutoff-PL 2.30e+00 1.85e+00 9.30e-01 5.19e-01 5.36e+00 5.60e+00 ph/cm2/s
Error 2.44e-01 1.01e-01 6.78e-02 1.50e-01 2.99e-01 3.82e-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 1.853 0.074 - - 3.42e-03 1.37e-04 44.520 57
CPL 1.632 0.289 84.7 -30.2 4.39e-03 1.41e-03 42.820 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 1.988 0.090 - - 3.65e-02 1.88e-03 65.170 57
CPL 1.766 0.357 52.3 0.0 4.72e-02 0.00e+00 63.970 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: 143.104000 sec.
T50 in the 50-300 keV band: 47.552000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 192.816 2.592 195.408
T90 149.576 7.508 157.084
T50 12.668 128.632 141.300
Peak 1.000 135.640 136.640
Image
Pre-slew 15.0-150.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
128.1730 45.4416 0.0178 42.1563 -139.7740 1.4799729 10.754 TRIG_00635887
Foreground time interval of the image:
0.000 18.000 (delta_t = 18.000 [sec])
Background time interval of the image:
-7.889 0.000 (delta_t = 7.889 [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 2.592 sec. to 195.408 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85259 ( -0.0732372 0.0740766 )
Norm@50keV : 3.41770E-03 ( -0.000137253 0.000136754 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.52 using 59 PHA bins.
# Reduced chi-squared = 0.7811 for 57 degrees of freedom
# Null hypothesis probability = 8.855589e-01
Photon flux (15-150 keV) in 192.8 sec: 0.480899 ( -0.0201235 0.0202042 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.05857e-06 ( -2.44305e-07 2.44885e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.592 sec. to 195.408 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.63183 ( -0.305761 0.271908 )
Epeak [keV] : 84.7432 ( -24.3197 -84.7431 )
Norm@50keV : 4.38824E-03 ( -0.00105127 0.00176842 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.82 using 59 PHA bins.
# Reduced chi-squared = 0.7646 for 56 degrees of freedom
# Null hypothesis probability = 9.023981e-01
Photon flux (15-150 keV) in 192.8 sec: 0.472988 ( -0.022365 0.022467 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.96249e-06 ( -2.76668e-07 2.75511e-07 ) ergs/cm2
Band function
Time interval is from 2.592 sec. to 195.408 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.63191 ( -0.17196 0.266686 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 84.7389 ( -22.0899 -84.7389 )
Norm@50keV : 4.38696E-03 ( -0.000167054 0.00176911 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.82 using 59 PHA bins.
# Reduced chi-squared = 0.7785 for 55 degrees of freedom
# Null hypothesis probability = 8.841117e-01
Photon flux (15-150 keV) in 192.8 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] : 13.2307 ( )
R^2/D10^2 : 7.57990E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 198.35 using 59 PHA bins.
# Reduced chi-squared = 3.4798 for 57 degrees of freedom
# Null hypothesis probability = 1.624459e-17
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.423e-07 4.251e-08
25- 50 1.903e-06 9.148e-08
50-150 2.128e-06 1.677e-07
15-150 4.574e-06 1.947e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 101.313 (-12.6498 20.4201)
Norm : 2.07838 (-0.132716 0.12052)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.28 using 59 PHA bins.
# Reduced chi-squared = 0.8120 for 57 degrees of freedom
# Null hypothesis probability = 8.440165e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.047e-06 8.377e-08
25- 50 1.816e-06 9.062e-08
50-150 2.964e-06 7.490e-07
15-150 5.827e-06 8.020e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.80566 (-1.00883 1.23004)
R1^2/D10^2 : 1.08933 (-0.53402 1.28654)
kT2 [keV] : 20.8486 (-2.5135 3.82348)
R2^2/D10^2 : 1.10495E-02 (-0.00531724 0.00755337)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.61 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 55 degrees of freedom
# Null hypothesis probability = 4.517520e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.071e-06 1.820e-07
25- 50 1.729e-06 1.664e-07
50-150 2.974e-06 3.374e-07
15-150 5.773e-06 5.138e-07
Peak spectrum fit
Power-law model
Time interval is from 135.640 sec. to 136.640 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98811 ( -0.0890112 0.0910228 )
Norm@50keV : 3.64827E-02 ( -0.00189142 0.00187627 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.17 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 57 degrees of freedom
# Null hypothesis probability = 2.138959e-01
Photon flux (15-150 keV) in 1 sec: 5.44271 ( -0.274115 0.275118 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.36236e-07 ( -1.67702e-08 1.68242e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 135.640 sec. to 136.640 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76626 ( -0.369648 0.344403 )
Epeak [keV] : 52.3136 ( )
Norm@50keV : 4.72173E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.97 using 59 PHA bins.
# Reduced chi-squared = 1.142 for 56 degrees of freedom
# Null hypothesis probability = 2.169574e-01
Photon flux (15-150 keV) in 1 sec: 5.36181 ( -0.29887 0.30004 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.31456e-07 ( -1.8535e-08 1.8438e-08 ) ergs/cm2
Band function
Time interval is from 135.640 sec. to 136.640 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.76674 ( 1.81058 0.410149 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 52.3068 ( -21.3508 -52.3068 )
Norm@50keV : 4.71802E-02 ( -0.0119491 0.0247792 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.97 using 59 PHA bins.
# Reduced chi-squared = 1.163 for 55 degrees of freedom
# Null hypothesis probability = 1.906042e-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] : 12.0610 ( )
R^2/D10^2 : 1.18499 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 176.60 using 59 PHA bins.
# Reduced chi-squared = 3.0982 for 57 degrees of freedom
# Null hypothesis probability = 3.685327e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.647e-08 3.205e-09
25- 50 1.155e-07 6.300e-09
50-150 1.013e-07 1.092e-08
15-150 2.533e-07 1.465e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 81.4220 (-11.6235 14.7489)
Norm : 24.6989 (-1.88987 2.08251)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.15 using 59 PHA bins.
# Reduced chi-squared = 1.196 for 57 degrees of freedom
# Null hypothesis probability = 1.482006e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.416e-08 4.705e-09
25- 50 1.061e-07 5.300e-09
50-150 1.515e-07 1.515e-08
15-150 3.217e-07 1.700e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.96605 (-0.935313 1.23253)
R1^2/D10^2 : 24.6471 (-14.3456 39.2042)
kT2 [keV] : 18.4009 (-2.19475 3.29316)
R2^2/D10^2 : 0.190836 (-0.0950692 0.133596)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.39 using 59 PHA bins.
# Reduced chi-squared = 1.334 for 55 degrees of freedom
# Null hypothesis probability = 4.935033e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.117e-08 1.618e-08
25- 50 9.783e-08 1.061e-08
50-150 1.507e-07 2.065e-08
15-150 3.197e-07 3.770e-08
Plot creation:
Mon Mar 23 18:25:48 EDT 2015