batgrbproduct Analysis for Trigger=655262
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): Sat Sep 12 18:08:50 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger655262/GCN5_download_cron
======================================================================
Trigger: 00655262 Segment: 000
BAT Trigger Time: 463689636.608 [s; MET]
Trigger Stop: 463689637.12 [s; MET]
UTC: 2015-09-11T18:40:21.487220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 67.4241761992931 Dec: 5.74277762478309 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.46
Image Trigger?: NO
Rate S/N Ratio: 15.2315462117278 [ if not an image trigger ]
Image S/N Ratio: 7.46
Flight Position: [ source = BAT ]
RA: 67.4241761992931 Dec: 5.74277762478309 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 67.4277044139863 Dec: 5.73073415693866 [deg; J2000]
{ 04h 29m 42.6s , +05d 43' 50.6" }
+/- 0.625113014857857 [arcmin] (estimated 90% radius based on SNR)
+/- 0.20265242324824 [arcmin] (formal 1-sigma fit error)
SNR: 59.5122237510378
Angular difference between Flight and Ground position is 0.752681 arcmin
Partial Coding Fraction: 0.6796875 [ including projection effects ]
Duration
T90: 7.1479999423027 +/- 0.588489602106457
Measured from: 0.360000133514404
to: 7.50800007581711 [s; relative to TRIGTIME]
T50: 3.59599995613098 +/- 0.174401806877123
Measured from: 2.11600011587143
to: 5.71200007200241 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.89600002765656
to: 4.89600002765656 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.0359999537468
to: 9.61200004816055 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.187497 1.606955 0.848533 0.114663
0.029555 0.031854 0.025926 0.019770 [error]
Peak 0.185185 0.229537 0.153448 0.026122
0.009991 0.011281 0.009277 0.006190 [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 4.61e-07 6.53e-07 6.86e-07 1.33e-06 2.22e-06 3.13e-06 erg/cm2
Error 2.25e-08 1.93e-08 2.70e-08 1.11e-07 6.53e-08 1.33e-07 erg/cm2
Peak flux Power-law 1.96e+00 1.73e+00 1.05e+00 9.58e-01 5.15e+00 5.70e+00 ph/cm2/s
Error 1.75e-01 9.85e-02 7.78e-02 1.40e-01 2.91e-01 3.14e-01 ph/cm2/s
Fluence Cutoff-PL 3.94e-07 7.04e-07 7.01e-07 4.31e-07 2.07e-06 2.23e-06 erg/cm2
Error 2.76e-08 2.39e-08 3.04e-08 1.16e-07 7.53e-08 1.38e-07 erg/cm2
Peak flux Cutoff-PL 1.77e+00 1.85e+00 1.09e+00 4.64e-01 5.01e+00 5.18e+00 ph/cm2/s
Error 2.06e-01 1.24e-01 8.77e-02 1.96e-01 3.02e-01 3.60e-01 ph/cm2/s
Fluence Band 3.71e-07 7.21e-07 6.68e-07 8.51e-07 2.08e-06 2.62e-06 erg/cm2
Error 3.19e-08 2.83e-08 3.44e-08 2.16e-07 7.29e-08 2.17e-07 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 1.929 0.052 - - 2.26e-02 6.74e-04 97.480 57
CPL 1.017 0.257 51.6 3.8 6.64e-02 2.03e-02 52.260 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.724 0.094 - - 3.84e-02 2.25e-03 54.020 57
CPL 1.047 0.416 67.2 20.3 8.72e-02 4.60e-02 44.970 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: 6.720000 sec.
T50 in the 50-300 keV band: 3.328000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 10.648 -1.036 9.612
T90 7.148 0.360 7.508
T50 3.596 2.116 5.712
Peak 1.000 3.896 4.896
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
67.4277 +5.7307 0.0032 29.3 -46.5 3.8666 59.5 TRIG_00655262
------------------------------------------
Foreground time interval of the image:
-1.036 9.612 (delta_t = 10.648 [sec])
Background time interval of the image:
-239.608 -1.036 (delta_t = 238.572 [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 -1.036 sec. to 9.612 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92880 ( -0.0517452 0.0520468 )
Norm@50keV : 2.26332E-02 ( -0.00067464 0.00067314 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 97.48 using 59 PHA bins.
# Reduced chi-squared = 1.710 for 57 degrees of freedom
# Null hypothesis probability = 6.761896e-04
Photon flux (15-150 keV) in 10.65 sec: 3.28856 ( -0.102679 0.102957 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.21703e-06 ( -6.5243e-08 6.53323e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.036 sec. to 9.612 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.01680 ( -0.264065 0.248977 )
Epeak [keV] : 51.6012 ( -3.44269 4.15017 )
Norm@50keV : 6.63894E-02 ( -0.0166276 0.0239284 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.26 using 59 PHA bins.
# Reduced chi-squared = 0.9332 for 56 degrees of freedom
# Null hypothesis probability = 6.171926e-01
Photon flux (15-150 keV) in 10.65 sec: 3.09522 ( -0.11231 0.11284 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.06578e-06 ( -7.5157e-08 7.54766e-08 ) ergs/cm2
Band function
Time interval is from -1.036 sec. to 9.612 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.426801 ( -0.618708 0.952312 )
beta : -2.37360 ( -0.520285 0.173656 )
Epeak [keV] : 43.8973 ( -3.2068 7.87188 )
Norm@50keV : 0.152879 ( -0.0912341 0.492123 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.39 using 59 PHA bins.
# Reduced chi-squared = 0.8617 for 55 degrees of freedom
# Null hypothesis probability = 7.571799e-01
Photon flux (15-150 keV) in 10.65 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.08465e-06 ( -2.08458e-06 -7.30164e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.2149 ( )
R^2/D10^2 : 0.702094 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 213.09 using 59 PHA bins.
# Reduced chi-squared = 3.7384 for 57 degrees of freedom
# Null hypothesis probability = 7.157917e-20
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.363e-07 1.273e-08
25- 50 7.591e-07 2.535e-08
50-150 6.890e-07 4.164e-08
15-150 1.684e-06 4.846e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 82.9314 (-7.26608 8.43939)
Norm : 15.0592 (-0.711257 0.751142)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.56 using 59 PHA bins.
# Reduced chi-squared = 0.9747 for 57 degrees of freedom
# Null hypothesis probability = 5.293647e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.170e-07 1.912e-08
25- 50 6.924e-07 2.013e-08
50-150 1.001e-06 5.969e-08
15-150 2.111e-06 6.603e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.34512 (-0.831167 0.860244)
R1^2/D10^2 : 3.15213 (-0.903917 1.47684)
kT2 [keV] : 21.0329 (-2.49002 3.67311)
R2^2/D10^2 : 5.80083E-02 (-0.0289956 0.0439507)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.89 using 59 PHA bins.
# Reduced chi-squared = 0.9434 for 55 degrees of freedom
# Null hypothesis probability = 5.942346e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.566e-07 3.557e-08
25- 50 7.233e-07 4.968e-08
50-150 9.655e-07 1.213e-07
15-150 2.045e-06 1.747e-07
Peak spectrum fit
Power-law model
Time interval is from 3.896 sec. to 4.896 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72406 ( -0.0932875 0.0945599 )
Norm@50keV : 3.84412E-02 ( -0.002257 0.00224491 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.02 using 59 PHA bins.
# Reduced chi-squared = 0.9478 for 57 degrees of freedom
# Null hypothesis probability = 5.874527e-01
Photon flux (15-150 keV) in 1 sec: 5.14909 ( -0.291009 0.291301 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.55291e-07 ( -2.16418e-08 2.17404e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.896 sec. to 4.896 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04745 ( -0.436994 0.395962 )
Epeak [keV] : 67.1844 ( -10.9529 29.5653 )
Norm@50keV : 8.71847E-02 ( -0.0326126 0.05948 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.97 using 59 PHA bins.
# Reduced chi-squared = 0.8030 for 56 degrees of freedom
# Null hypothesis probability = 8.544727e-01
Photon flux (15-150 keV) in 1 sec: 5.01351 ( -0.30159 0.30152 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.39104e-07 ( -2.3681e-08 2.3762e-08 ) ergs/cm2
Band function
Time interval is from 3.896 sec. to 4.896 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.970652 ( -0.446787 2.30131 )
beta : -2.35181 ( 2.3582 0.510267 )
Epeak [keV] : 63.3354 ( -30.6903 29.424 )
Norm@50keV : 9.70488E-02 ( -0.040935 4.92574 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.63 using 59 PHA bins.
# Reduced chi-squared = 0.8115 for 55 degrees of freedom
# Null hypothesis probability = 8.398460e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.39252e-07 ( -3.39245e-07 -2.3638e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.8818 (-0.822973 0.889052)
R^2/D10^2 : 0.977436 (-0.214777 0.271315)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 102.85 using 59 PHA bins.
# Reduced chi-squared = 1.8043 for 57 degrees of freedom
# Null hypothesis probability = 1.906365e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.440e-08 3.480e-09
25- 50 1.173e-07 7.450e-09
50-150 1.224e-07 1.420e-08
15-150 2.741e-07 1.840e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 122.817 (-24.9639 32.9271)
Norm : 21.8867 (-1.51065 1.77612)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.86 using 59 PHA bins.
# Reduced chi-squared = 0.8046 for 57 degrees of freedom
# Null hypothesis probability = 8.546085e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.695e-08 4.845e-09
25- 50 1.023e-07 7.955e-09
50-150 1.846e-07 5.385e-08
15-150 3.439e-07 5.820e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.40188 (-1.31247 1.57423)
R1^2/D10^2 : 7.34221 (-3.66412 9.15025)
kT2 [keV] : 20.5348 (-3.09855 5.28599)
R2^2/D10^2 : 0.133066 (-0.0815179 0.130148)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.20 using 59 PHA bins.
# Reduced chi-squared = 0.8401 for 55 degrees of freedom
# Null hypothesis probability = 7.949272e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.434e-08 1.194e-08
25- 50 1.042e-07 1.874e-08
50-150 1.760e-07 3.990e-08
15-150 3.345e-07 7.255e-08
Plot creation:
Sat Sep 12 18:13:37 EDT 2015