batgrbproduct Analysis for Trigger=655449
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 14 09:48:38 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger655449/GCN5_download_cron
======================================================================
Trigger: 00655449 Segment: 000
BAT Trigger Time: 463836120 [s; MET]
Trigger Stop: 463836184 [s; MET]
UTC: 2015-09-13T11:21:44.871460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 244.923704463459 Dec: -15.840137535298 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.2
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.2
Flight Position: [ source = BAT ]
RA: 244.923704463459 Dec: -15.840137535298 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 244.868404357401 Dec: -15.8332203792708 [deg; J2000]
{ 16h 19m 28.4s , -15d 49' 59.6" }
+/- 6.01159192284943 [arcmin] (estimated 90% radius based on SNR)
+/- 5.25832834834087 [arcmin] (formal 1-sigma fit error)
SNR: 2.34572041832723
Angular difference between Flight and Ground position is 3.218934 arcmin
Partial Coding Fraction: 0.2578125 [ including projection effects ]
Duration
T90: 0.0559999346733093 +/- 77.6685619999012
Measured from: 4.50000011920929
to: 4.5560000538826 [s; relative to TRIGTIME]
T50: 78.5039999485016 +/- 72.2170260380977
Measured from: 4.38000011444092
to: 82.8840000629425 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.39200001955032
to: 5.39200001955032 [s; relative to TRIGTIME]
Total Fluence
Measured from: 4.37999999523163
to: 82.8840000033379 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.861272 0.321409 0.228169 0.018832
0.112898 0.111156 0.097143 0.088901 [error]
Peak 0.030664 0.030082 0.020426 0.029487
0.012750 0.013307 0.011605 0.010600 [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 7.56e-07 1.71e-07 1.98e-08 2.54e-09 9.49e-07 9.50e-07 erg/cm2
Error 1.03e-07 5.96e-08 1.64e-08 4.25e-09 1.32e-07 1.32e-07 erg/cm2
Peak flux Power-law 4.06e-01 2.97e-01 1.44e-01 9.88e-02 8.93e-01 9.45e-01 ph/cm2/s
Error 3.39e-01 1.20e-01 1.25e-01 1.66e-01 3.53e-01 3.73e-01 ph/cm2/s
Fluence Cutoff-PL 7.67e-07 1.41e-07 1.53e-08 1.14e-09 9.06e-07 9.42e-07 erg/cm2
Error 1.05e-07 7.23e-08 1.79e-08 3.35e-09 1.26e-07 1.50e-07 erg/cm2
Peak flux Cutoff-PL 4.15e-01 2.96e-01 1.39e-01 9.13e-02 8.95e-01 9.42e-01 ph/cm2/s
Error 2.50e-01 1.20e-01 1.18e-01 1.16e-01 3.52e-01 3.70e-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 5.112 0.661 - - 2.22e-04 1.45e-04 58.660 57
CPL 1.000 0.000 50.0 0.0 3.92e-03 0.00e+00 161.230 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.044 1.070 - - 5.83e-03 4.38e-03 52.020 57
CPL 2.089 1.214 39.3 0.0 4.83e-03 0.00e+00 51.810 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 78.504 4.380 82.884
T90 0.056 4.500 4.556
T50 78.504 4.380 82.884
Peak 1.000 4.392 5.392
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
244.8684 -15.8332 0.0822 45.3 166.7 0.5264 2.3 TRIG_00655449
------------------------------------------
Foreground time interval of the image:
4.380 70.301 (delta_t = 65.921 [sec])
Background time interval of the image:
-119.000 -98.290 (delta_t = 20.710 [sec])
-97.000 4.380 (delta_t = 101.380 [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 4.380 sec. to 82.884 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.11232 ( -0.623868 0.697689 )
Norm@50keV : 2.21838E-04 ( -0.00011243 0.00017705 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.66 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 57 degrees of freedom
# Null hypothesis probability = 4.143527e-01
Photon flux (15-150 keV) in 78.5 sec: 0.381180 ( -0.0497749 0.0497766 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.49403e-07 ( -1.30702e-07 1.33017e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.380 sec. to 82.884 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 3.92444E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 161.23 using 59 PHA bins.
# Reduced chi-squared = 2.8791 for 56 degrees of freedom
# Null hypothesis probability = 3.974498e-12
Photon flux (15-150 keV) in 78.5 sec: 0.373582 ( -0.050133 0.050518 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.0589e-07 ( -1.24185e-07 1.26864e-07 ) ergs/cm2
Band function
Time interval is from 4.380 sec. to 82.884 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.02937 ( 3.08232 8.02937 )
beta : -5.19511 ( -0.634122 0.696445 )
Epeak [keV] : 424.040 ( -424.04 -424.04 )
Norm@50keV : 2.77455E-02 ( -0.0136632 0.0258515 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.70 using 59 PHA bins.
# Reduced chi-squared = 1.067 for 55 degrees of freedom
# Null hypothesis probability = 3.413196e-01
Photon flux (15-150 keV) in 78.5 sec: 0.270027 ( 6.72997 -0.270027 ) 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] : 3.01624 (-0.391241 0.441612)
R^2/D10^2 : 50.3436 (-29.4745 80.6475)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.70 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 57 degrees of freedom
# Null hypothesis probability = 4.130818e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.639e-07 2.594e-07
25- 50 1.135e-07 4.963e-08
50-150 1.909e-10 1.779e-10
15-150 8.776e-07 3.388e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.82347 (-1.12394 1.45912)
Norm : 51.5206 (-25.516 58.616)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.72 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 57 degrees of freedom
# Null hypothesis probability = 4.485064e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.676e-07 2.543e-07
25- 50 1.345e-07 5.471e-08
50-150 1.425e-09 1.354e-09
15-150 9.035e-07 2.865e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.94794 (-0.401218 0.438607)
R1^2/D10^2 : 57.5339 (-34.4452 52.37)
kT2 [keV] : 26.3115 (-26.5195 164.875)
R2^2/D10^2 : 6.31012E-04 (-0.000611506 0.0156865)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.29 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 55 degrees of freedom
# Null hypothesis probability = 4.263591e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.625e-07 3.419e-07
25- 50 1.374e-07 6.472e-08
50-150 1.717e-07 1.454e-07
15-150 1.072e-06 4.716e-07
Peak spectrum fit
Power-law model
Time interval is from 4.392 sec. to 5.392 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.04419 ( -0.88296 1.25685 )
Norm@50keV : 5.83298E-03 ( -0.00583171 0.00293502 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.02 using 59 PHA bins.
# Reduced chi-squared = 0.9127 for 57 degrees of freedom
# Null hypothesis probability = 6.618872e-01
Photon flux (15-150 keV) in 1 sec: 0.893231 ( -0.353593 0.353383 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.39313e-08 ( -2.61645e-08 2.75463e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.392 sec. to 5.392 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.08855 ( -1.80661 0.622374 )
Epeak [keV] : 39.2947 ( )
Norm@50keV : 4.83162E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.81 using 59 PHA bins.
# Reduced chi-squared = 0.9252 for 56 degrees of freedom
# Null hypothesis probability = 6.339865e-01
Photon flux (15-150 keV) in 1 sec: 0.894621 ( -0.351401 0.351839 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.28304e-08 ( -2.51244e-08 1.36943e-08 ) ergs/cm2
Band function
Time interval is from 4.392 sec. to 5.392 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.52759 ( 1.53118 1.53118 )
beta : -2.01923 ( 2.02838 0.866669 )
Epeak [keV] : 14.7984 ( -11.54 -11.54 )
Norm@50keV : 1.71672E-02 ( -0.0186369 1.17298 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.03 using 59 PHA bins.
# Reduced chi-squared = 0.9459 for 55 degrees of freedom
# Null hypothesis probability = 5.889863e-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] : 6.93522 (-2.99821 6.52239)
R^2/D10^2 : 1.60254 (-1.60021 18.021)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.30 using 59 PHA bins.
# Reduced chi-squared = 0.9701 for 57 degrees of freedom
# Null hypothesis probability = 5.392870e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.226e-08 7.585e-09
25- 50 1.649e-08 1.087e-08
50-150 2.642e-09 2.324e-09
15-150 3.140e-08 1.996e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 84.8275 (-85.5686 -85.5686)
Norm : 3.93926 (-1.89782 12.4837)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.13 using 59 PHA bins.
# Reduced chi-squared = 0.9321 for 57 degrees of freedom
# Null hypothesis probability = 6.211130e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.025e-08 6.680e-09
25- 50 1.712e-08 1.089e-08
50-150 2.511e-08 2.193e-08
15-150 5.248e-08 3.749e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.70844 (-3.08757 3.74965)
R1^2/D10^2 : 3.27908 (-2.91156 160.192)
kT2 [keV] : 61.1779 (-43.8708 -61.1795)
R2^2/D10^2 : 9.22054E-04 (-0.000887452 0.032403)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.38 using 59 PHA bins.
# Reduced chi-squared = 0.9160 for 55 degrees of freedom
# Null hypothesis probability = 6.514144e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.349e-08 8.190e-09
25- 50 1.417e-08 8.385e-09
50-150 3.609e-08 2.194e-08
15-150 6.375e-08 3.253e-08
Plot creation:
Mon Sep 14 09:52:59 EDT 2015