batgrbproduct Analysis for Trigger=634795
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): Sun Mar 15 07:11:41 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger634795/GCN5_download_cron
======================================================================
Trigger: 00634795 Segment: 000
BAT Trigger Time: 448001706.176 [s; MET]
Trigger Stop: 448001707.2 [s; MET]
UTC: 2015-03-14T04:54:52.869200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 126.658741157189 Dec: 63.8332935465329 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 25.72
Image Trigger?: NO
Rate S/N Ratio: 255.998046867549 [ if not an image trigger ]
Image S/N Ratio: 25.72
Flight Position: [ source = BAT ]
RA: 126.658741157189 Dec: 63.8332935465329 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 126.660671690374 Dec: 63.8391615350851 [deg; J2000]
{ 08h 26m 38.6s , +63d 50' 21.0" }
+/- 0.587798372315902 [arcmin] (estimated 90% radius based on SNR)
+/- 0.190671331698755 [arcmin] (formal 1-sigma fit error)
SNR: 64.9818578954093
Angular difference between Flight and Ground position is 0.355765 arcmin
Partial Coding Fraction: 0.34375 [ including projection effects ]
Duration
T90: 13.1359999775887 +/- 2.63134115747024
Measured from: -1.21999990940094
to: 11.9160000681877 [s; relative to TRIGTIME]
T50: 5.35599994659424 +/- 0.149452374785769
Measured from: 0.340000092983246
to: 5.69600003957748 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0600000023841858
to: 1.06000000238419 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.17199999094009
to: 101.420000016689 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 5.500099 9.975300 10.771075 3.854459
0.089237 0.105111 0.105084 0.080700 [error]
Peak 0.668014 1.509653 1.920977 0.710232
0.022514 0.031857 0.036951 0.027321 [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 1.85e-06 4.39e-06 8.30e-06 3.81e-05 2.25e-05 5.27e-05 erg/cm2
Error 6.61e-08 9.32e-08 1.26e-07 1.40e-06 3.35e-07 1.42e-06 erg/cm2
Peak flux Power-law 7.41e+00 1.10e+01 1.22e+01 2.57e+01 3.85e+01 5.64e+01 ph/cm2/s
Error 3.83e-01 3.48e-01 3.01e-01 1.38e+00 9.36e-01 1.52e+00 ph/cm2/s
Fluence Cutoff-PL 1.83e-06 4.40e-06 8.36e-06 3.51e-05 2.25e-05 4.95e-05 erg/cm2
Error 7.01e-08 8.41e-08 1.41e-07 2.84e-06 3.37e-07 3.50e-06 erg/cm2
Peak flux Cutoff-PL 6.59e+00 1.11e+01 1.29e+01 1.84e+01 3.80e+01 4.90e+01 ph/cm2/s
Error 5.03e-01 3.66e-01 4.12e-01 2.69e+00 9.54e-01 2.83e+00 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 1.081 0.028 - - 2.06e-02 3.33e-04 32.470 57
CPL 1.075 0.092 9996.1 0.0 2.08e-02 1.79e-03 32.340 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.847 0.041 - - 3.35e-01 8.21e-03 53.470 57
CPL 0.465 0.175 248.1 101.3 4.83e-01 7.88e-02 38.320 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: 10.688000 sec.
T50 in the 50-300 keV band: 4.352000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 103.592 -2.172 101.420
T90 13.136 -1.220 11.916
T50 5.356 0.340 5.696
Peak 1.000 0.060 1.060
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
126.6607 +63.8392 0.0030 35.1 -64.9 29.0088 65.0 TRIG_00634795
------------------------------------------
Foreground time interval of the image:
-2.172 14.125 (delta_t = 16.297 [sec])
Background time interval of the image:
-239.176 -2.172 (delta_t = 237.004 [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 -2.172 sec. to 101.420 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08086 ( -0.0280961 0.0279657 )
Norm@50keV : 2.06448E-02 ( -0.000333304 0.000332064 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.47 using 59 PHA bins.
# Reduced chi-squared = 0.5697 for 57 degrees of freedom
# Null hypothesis probability = 9.963392e-01
Photon flux (15-150 keV) in 103.6 sec: 2.39041 ( -0.041247 0.0413937 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.25002e-05 ( -3.34598e-07 3.34611e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.172 sec. to 101.420 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.07481 ( -0.1236 0.0599983 )
Epeak [keV] : 9996.10 ( )
Norm@50keV : 2.07567E-02 ( -0.000316614 0.00326668 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 32.34 using 59 PHA bins.
# Reduced chi-squared = 0.5774 for 56 degrees of freedom
# Null hypothesis probability = 9.952961e-01
Photon flux (15-150 keV) in 103.6 sec: 2.38930 ( -0.04089 0.04071 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.24849e-05 ( -3.35768e-07 3.38565e-07 ) ergs/cm2
Band function
Time interval is from -2.172 sec. to 101.420 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.59396 ( -4.59396 -4.59396 )
beta : -1.08806 ( -0.0285305 0.0286393 )
Epeak [keV] : 25.0928 ( -25.0928 3.82771 )
Norm@50keV : 712.134 ( -10.4416 2.91821e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 30.92 using 59 PHA bins.
# Reduced chi-squared = 0.5622 for 55 degrees of freedom
# Null hypothesis probability = 9.964240e-01
Photon flux (15-150 keV) in 103.6 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] : 24.5221 ( )
R^2/D10^2 : 5.86055E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 797.87 using 59 PHA bins.
# Reduced chi-squared = 13.998 for 57 degrees of freedom
# Null hypothesis probability = 3.480266e-131
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.407e-07 2.077e-08
25- 50 3.599e-06 8.806e-08
50-150 1.609e-05 3.212e-07
15-150 2.033e-05 3.263e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 10.6841 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 999.89 using 59 PHA bins.
# Reduced chi-squared = 17.542 for 57 degrees of freedom
# Null hypothesis probability = 2.301083e-172
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.756e-06 4.817e-08
25- 50 5.302e-06 8.547e-08
50-150 1.163e-05 2.020e-07
15-150 1.969e-05 3.315e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.33897 (-0.627746 0.670087)
R1^2/D10^2 : 0.728247 (-0.139215 0.180353)
kT2 [keV] : 39.4193 (-2.45046 3.02734)
R2^2/D10^2 : 1.13583E-02 (-0.00232493 0.00256718)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.53 using 59 PHA bins.
# Reduced chi-squared = 0.6642 for 55 degrees of freedom
# Null hypothesis probability = 9.740091e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.543e-06 9.479e-08
25- 50 4.554e-06 1.456e-07
50-150 1.645e-05 4.507e-07
15-150 2.255e-05 5.335e-07
Peak spectrum fit
Power-law model
Time interval is from 0.060 sec. to 1.060 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.847386 ( -0.0413474 0.0411037 )
Norm@50keV : 0.335047 ( -0.00821621 0.00820046 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.47 using 59 PHA bins.
# Reduced chi-squared = 0.9380 for 57 degrees of freedom
# Null hypothesis probability = 6.084280e-01
Photon flux (15-150 keV) in 1 sec: 38.4620 ( -0.935426 0.936063 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.83947e-06 ( -9.72527e-08 9.73028e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.060 sec. to 1.060 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.464700 ( -0.178007 0.171306 )
Epeak [keV] : 248.134 ( -58.7754 143.892 )
Norm@50keV : 0.482789 ( -0.0711631 0.0863748 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.32 using 59 PHA bins.
# Reduced chi-squared = 0.6843 for 56 degrees of freedom
# Null hypothesis probability = 9.658657e-01
Photon flux (15-150 keV) in 1 sec: 37.9939 ( -0.954 0.9549 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.80979e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.060 sec. to 1.060 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99996 ( -4.99996 -4.99996 )
beta : -0.847488 ( -0.0410925 0.0413858 )
Epeak [keV] : 16.4876 ( -16.4876 9983.12 )
Norm@50keV : 2.18206E+05 ( -5116.4 8.46567e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.45 using 59 PHA bins.
# Reduced chi-squared = 0.9717 for 55 degrees of freedom
# Null hypothesis probability = 5.342190e-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] : 25.1721 ( )
R^2/D10^2 : 0.966176 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 236.28 using 59 PHA bins.
# Reduced chi-squared = 4.1453 for 57 degrees of freedom
# Null hypothesis probability = 1.091568e-23
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.060e-07 5.050e-09
25- 50 6.033e-07 2.245e-08
50-150 2.831e-06 9.550e-08
15-150 3.541e-06 1.025e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 152.026 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 809.50 using 59 PHA bins.
# Reduced chi-squared = 14.202 for 57 degrees of freedom
# Null hypothesis probability = 1.542749e-133
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.786e-07 1.020e-08
25- 50 7.282e-07 1.810e-08
50-150 1.597e-06 4.000e-08
15-150 2.704e-06 6.800e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.3099 (-1.35135 1.53139)
R1^2/D10^2 : 6.78624 (-1.95874 3.08772)
kT2 [keV] : 39.8468 (-4.22913 6.53236)
R2^2/D10^2 : 0.206581 (-0.0767297 0.0886685)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.76 using 59 PHA bins.
# Reduced chi-squared = 0.6683 for 55 degrees of freedom
# Null hypothesis probability = 9.722287e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.908e-07 2.130e-08
25- 50 6.740e-07 4.605e-08
50-150 2.970e-06 2.380e-07
15-150 3.835e-06 2.560e-07
Plot creation:
Sun Mar 15 07:15:40 EDT 2015