batgrbproduct Analysis for Trigger=628458
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): Wed Jan 28 13:43:13 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger628458/batgroup_hand_proc
======================================================================
Trigger: 00628458 Segment: 000
BAT Trigger Time: 444050768 [s; MET]
Trigger Stop: 444051224 [s; MET]
UTC: 2015-01-27T11:25:54.893320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 189.211116194227 Dec: 7.32963189728959 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.06
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.06
Flight Position: [ source = BAT ]
RA: 189.211116194227 Dec: 7.32963189728959 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 189.261768164425 Dec: 7.26375258178447 [deg; J2000]
{ 12h 37m 02.8s , +07d 15' 49.5" }
+/- 4.81000511942368 [arcmin] (estimated 90% radius based on SNR)
+/- 4.05462121753384 [arcmin] (formal 1-sigma fit error)
SNR: 3.22570578743943
Angular difference between Flight and Ground position is 4.971072 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 456 +/-
Measured from: 0
to: 456 [s; relative to TRIGTIME]
T50: 456 +/-
Measured from: 0
to: 456 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 456 second)
Measured from: 0
to: 456 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 456 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.405003 0.442272 0.073180 0.107883
0.102492 0.102909 0.091859 0.082408 [error]
Peak 0.405003 0.442272 0.073180 0.107883
0.102492 0.102909 0.091859 0.082408 [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 1.02e-07 1.41e-07 1.45e-07 2.73e-07 4.75e-07 6.61e-07 erg/cm2
Error 3.82e-08 4.40e-08 7.88e-08 3.23e-07 1.81e-07 3.75e-07 erg/cm2
Peak flux Power-law 7.27e-03 5.58e-03 2.86e-03 2.12e-03 1.67e-02 1.78e-02 ph/cm2/s
Error 2.78e-03 1.71e-03 1.44e-03 2.37e-03 5.02e-03 5.57e-03 ph/cm2/s
Fluence Cutoff-PL 9.32e-08 2.02e-07 4.84e-08 3.30e-10 3.44e-07 3.44e-07 erg/cm2
Error 4.58e-08 6.83e-08 7.77e-08 2.61e-08 1.24e-07 1.14e-07 erg/cm2
Peak flux Cutoff-PL 6.38e-03 8.08e-03 1.11e-03 4.18e-06 1.56e-02 1.56e-02 ph/cm2/s
Error 3.28e-03 2.65e-03 1.60e-03 2.74e-04 4.62e-03 4.62e-03 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 1.960 0.532 - - 1.13e-04 4.44e-05 70.940 57
CPL -2.310 4.840 33.3 8.1 7.39e-02 4.81e+02 66.320 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 1.960 0.532 - - 1.13e-04 4.44e-05 70.940 57
CPL -2.310 4.840 33.3 8.1 7.39e-02 4.81e+02 66.320 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 456.000 0.000 456.000
T90 456.000 0.000 456.000
T50 456.000 0.000 456.000
Peak 456.000 0.000 456.000
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
189.2618 7.2638 0.0597 9.0364 42.6363 0.9288048 3.226 TRIG_00628458
Foreground time interval of the image:
0.000 456.000 (delta_t = 456.000 [sec])
Background time interval of the image:
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 0.000 sec. to 456.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96038 ( -0.497722 0.566688 )
Norm@50keV : 1.13274E-04 ( -4.46864e-05 4.41181e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.94 using 59 PHA bins.
# Reduced chi-squared = 1.244 for 57 degrees of freedom
# Null hypothesis probability = 1.014806e-01
Photon flux (15-150 keV) in 456 sec: 1.66882E-02 ( -0.00501848 0.00502771 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.75293e-07 ( -1.72447e-07 1.89536e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 456.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.30993 ( -6.24182 3.43751 )
Epeak [keV] : 33.2992 ( -7.13435 8.99624 )
Norm@50keV : 7.38586E-02 ( -0.0904776 961.118 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.32 using 59 PHA bins.
# Reduced chi-squared = 1.184 for 56 degrees of freedom
# Null hypothesis probability = 1.628559e-01
Photon flux (15-150 keV) in 456 sec: 1.55813E-02 ( -0.0045755 0.00467 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.44092e-07 ( -1.07834e-07 1.40276e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 456.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.44262 ( -4.94757 -3.85836 )
beta : -6.02831 ( 5.54423 14.119 )
Epeak [keV] : 32.9736 ( -12.7235 7.37047 )
Norm@50keV : 0.404808 ( -0.406888 3.4289 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.23 using 59 PHA bins.
# Reduced chi-squared = 1.204 for 55 degrees of freedom
# Null hypothesis probability = 1.427917e-01
Photon flux (15-150 keV) in 456 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] : 8.58776 (-1.97024 2.60776)
R^2/D10^2 : 1.54119E-02 (-0.0154119 0.0266241)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.53 using 59 PHA bins.
# Reduced chi-squared = 1.167 for 57 degrees of freedom
# Null hypothesis probability = 1.817453e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.830e-08 5.610e-08
25- 50 1.939e-07 1.150e-07
50-150 6.394e-08 4.741e-08
15-150 3.561e-07 2.062e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 52.9459 (-27.4299 120.562)
Norm : 9.38633E-02 (-0.03617 0.0615114)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.40 using 59 PHA bins.
# Reduced chi-squared = 1.218 for 57 degrees of freedom
# Null hypothesis probability = 1.254555e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.060e-07 6.215e-08
25- 50 1.552e-07 9.188e-08
50-150 1.589e-07 1.274e-07
15-150 4.201e-07 2.695e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 200.000 ( )
R1^2/D10^2 : 7.65109E-07 (-7.65109e-07 -7.65109e-07)
kT2 [keV] : 8.28826 (-1.87233 2.66846)
R2^2/D10^2 : 1.71610E-02 (-0.0113087 0.0216645)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.53 using 59 PHA bins.
#Fit statistic : Chi-Squared = 66.13 using 59 PHA bins.
# Reduced chi-squared = 1.210 for 55 degrees of freedom
# Reduced chi-squared = 1.202 for 55 degrees of freedom
# Null hypothesis probability = 1.370948e-01
# Null hypothesis probability = 1.446274e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.742e-08 4.644e-02
25- 50 1.944e-07 4.004e-01
50-150 6.562e-08 9.977e+00
15-150 3.574e-07 9.435e+00
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 456.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.96038 ( -0.497722 0.566688 )
Norm@50keV : 1.13274E-04 ( -4.46864e-05 4.41181e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.94 using 59 PHA bins.
# Reduced chi-squared = 1.244 for 57 degrees of freedom
# Null hypothesis probability = 1.014806e-01
Photon flux (15-150 keV) in 456 sec: 1.66882E-02 ( -0.00501848 0.00502771 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.75293e-07 ( -1.72447e-07 1.89536e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 456.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.30993 ( -6.24182 3.43751 )
Epeak [keV] : 33.2992 ( -7.13435 8.99624 )
Norm@50keV : 7.38586E-02 ( -0.0904776 961.118 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.32 using 59 PHA bins.
# Reduced chi-squared = 1.184 for 56 degrees of freedom
# Null hypothesis probability = 1.628559e-01
Photon flux (15-150 keV) in 456 sec: 1.55813E-02 ( -0.0045755 0.00467 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.44092e-07 ( -1.07834e-07 1.40276e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 456.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.44262 ( -4.94757 -3.85836 )
beta : -6.02831 ( 5.54423 14.119 )
Epeak [keV] : 32.9736 ( -12.7235 7.37047 )
Norm@50keV : 0.404808 ( -0.406888 3.81875 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.23 using 59 PHA bins.
# Reduced chi-squared = 1.204 for 55 degrees of freedom
# Null hypothesis probability = 1.427917e-01
Photon flux (15-150 keV) in 456 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] : 8.58776 (-1.97024 2.60776)
R^2/D10^2 : 1.54119E-02 (-0.0154119 0.0266241)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.53 using 59 PHA bins.
# Reduced chi-squared = 1.167 for 57 degrees of freedom
# Null hypothesis probability = 1.817453e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.830e-08 5.880e-08
25- 50 1.939e-07 1.178e-07
50-150 6.394e-08 4.877e-08
15-150 3.561e-07 1.958e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 52.9459 (-27.4299 120.562)
Norm : 9.38633E-02 (-0.03617 0.0615114)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.40 using 59 PHA bins.
# Reduced chi-squared = 1.218 for 57 degrees of freedom
# Null hypothesis probability = 1.254555e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.060e-07 6.319e-08
25- 50 1.552e-07 8.918e-08
50-150 1.589e-07 1.258e-07
15-150 4.201e-07 2.554e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 200.000 ( )
R1^2/D10^2 : 7.65109E-07 (-7.65109e-07 -7.65109e-07)
kT2 [keV] : 8.28826 (-1.87233 2.66846)
R2^2/D10^2 : 1.71610E-02 (-0.0113087 0.0216645)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.53 using 59 PHA bins.
#Fit statistic : Chi-Squared = 66.13 using 59 PHA bins.
# Reduced chi-squared = 1.210 for 55 degrees of freedom
# Reduced chi-squared = 1.202 for 55 degrees of freedom
# Null hypothesis probability = 1.370948e-01
# Null hypothesis probability = 1.446274e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.742e-08 4.747e-02
25- 50 1.944e-07 4.068e-01
50-150 6.562e-08 9.485e+00
15-150 3.574e-07 1.020e+01
Plot creation:
Wed Jan 28 14:04:10 EST 2015