batgrbproduct Analysis for Trigger=629578
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): Thu Feb 5 09:29:46 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger629578/batgroup_hand_proc
======================================================================
Trigger: 00629578 Segment: 000
BAT Trigger Time: 444629360.64 [s; MET]
Trigger Stop: 444629361.664 [s; MET]
UTC: 2015-02-03T04:09:07.504140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 98.4145772413157 Dec: 6.96780251737358 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.19
Image Trigger?: NO
Rate S/N Ratio: 13.856406460551 [ if not an image trigger ]
Image S/N Ratio: 7.19
Flight Position: [ source = BAT ]
RA: 98.4145772413157 Dec: 6.96780251737358 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 98.3938930276037 Dec: 6.95196356106658 [deg; J2000]
{ 06h 33m 34.5s , +06d 57' 07.1" }
+/- 1.1174202120452 [arcmin] (estimated 90% radius based on SNR)
+/- 0.381368221336769 [arcmin] (formal 1-sigma fit error)
SNR: 25.9559921005288
Angular difference between Flight and Ground position is 1.555872 arcmin
Partial Coding Fraction: 0.84375 [ including projection effects ]
Duration
T90: 25.8479999303818 +/- 4.97665145161563
Measured from: 0.38400000333786
to: 26.2319999337196 [s; relative to TRIGTIME]
T50: 12.0799999237061 +/- 1.60969192281866
Measured from: 6.66000002622604
to: 18.7399999499321 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 16.7919999957085
to: 17.7919999957085 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.828000009059906
to: 32.2840000391006 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.616138 0.646656 0.347799 0.070421
0.034203 0.033291 0.027822 0.022399 [error]
Peak 0.035927 0.047408 0.023673 0.005135
0.006152 0.006194 0.005134 0.003939 [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 1.84e-07 2.65e-07 2.83e-07 5.63e-07 9.07e-07 1.30e-06 erg/cm2
Error 1.77e-08 1.62e-08 2.75e-08 1.12e-07 6.32e-08 1.38e-07 erg/cm2
Peak flux Power-law 3.70e-01 3.00e-01 1.64e-01 1.31e-01 8.92e-01 9.65e-01 ph/cm2/s
Error 8.43e-02 4.85e-02 4.07e-02 6.12e-02 1.45e-01 1.59e-01 ph/cm2/s
Fluence Cutoff-PL 1.76e-07 2.75e-07 2.84e-07 3.21e-07 8.78e-07 1.06e-06 erg/cm2
Error 2.04e-08 2.06e-08 2.91e-08 2.30e-07 7.26e-08 1.81e-07 erg/cm2
Peak flux Cutoff-PL 3.21e-01 3.47e-01 1.69e-01 3.52e-02 8.65e-01 8.72e-01 ph/cm2/s
Error 9.73e-02 6.62e-02 4.88e-02 5.72e-02 1.46e-01 1.53e-01 ph/cm2/s
Fluence Band 1.74e-07 2.76e-07 2.78e-07 4.48e-07 8.82e-07 1.18e-06 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 3.30e-01 3.36e-01 1.74e-01 5.21e-02 8.79e-01 8.94e-01 ph/cm2/s
Error -------- 6.78e-02 -------- -------- 1.49e-01 1.60e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.902 0.116 - - 2.98e-03 2.09e-04 46.900 57
CPL 1.561 0.446 58.2 -20.5 4.57e-03 2.71e-03 45.110 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 1.871 0.277 - - 6.29e-03 1.21e-03 57.900 57
CPL 0.595 1.329 48.5 27.9 3.25e-02 1.17e-01 54.080 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: 20.544000 sec.
T50 in the 50-300 keV band: 14.784000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 33.112 -0.828 32.284
T90 25.848 0.384 26.232
T50 12.080 6.660 18.740
Peak 1.000 16.792 17.792
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
98.3939 6.9520 0.0074 20.7320 148.5975 1.3776716 25.956 TRIG_00629578
Foreground time interval of the image:
-0.828 20.061 (delta_t = 20.889 [sec])
Background time interval of the image:
-119.640 -0.828 (delta_t = 118.812 [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 -0.828 sec. to 32.284 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.90244 ( -0.115019 0.1177 )
Norm@50keV : 2.97897E-03 ( -0.000210698 0.000208224 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.90 using 59 PHA bins.
# Reduced chi-squared = 0.8228 for 57 degrees of freedom
# Null hypothesis probability = 8.276603e-01
Photon flux (15-150 keV) in 33.11 sec: 0.427956 ( -0.0267678 0.0268048 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.06827e-07 ( -6.29474e-08 6.35076e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.828 sec. to 32.284 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56057 ( -0.484778 0.408046 )
Epeak [keV] : 58.2292 ( -17.2012 -58.2292 )
Norm@50keV : 4.56556E-03 ( -0.00170417 0.0037156 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.11 using 59 PHA bins.
# Reduced chi-squared = 0.8055 for 56 degrees of freedom
# Null hypothesis probability = 8.509877e-01
Photon flux (15-150 keV) in 33.11 sec: 0.420284 ( -0.028414 0.028411 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.78316e-07 ( -7.22791e-08 7.28718e-08 ) ergs/cm2
Band function
Time interval is from -0.828 sec. to 32.284 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.56056 ( 1.56525 0.504867 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 58.2186 ( -17.1933 -58.2186 )
Norm@50keV : 4.56480E-03 ( -0.00164009 0.00371764 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.11 using 59 PHA bins.
# Reduced chi-squared = 0.8201 for 55 degrees of freedom
# Null hypothesis probability = 8.268998e-01
Photon flux (15-150 keV) in 33.11 sec: 0.423107 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.81762e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.2646 (-0.854205 0.93018)
R^2/D10^2 : 0.124167 (-0.0322883 0.0434199)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 104.88 using 59 PHA bins.
# Reduced chi-squared = 1.8399 for 57 degrees of freedom
# Null hypothesis probability = 1.159988e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.095e-07 1.301e-08
25- 50 3.190e-07 2.374e-08
50-150 2.328e-07 3.660e-08
15-150 6.613e-07 4.818e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 84.3143 (-16.3479 23.2985)
Norm : 1.95586 (-0.183871 0.210385)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.92 using 59 PHA bins.
# Reduced chi-squared = 0.8056 for 57 degrees of freedom
# Null hypothesis probability = 8.531802e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.685e-07 1.753e-08
25- 50 2.809e-07 1.750e-08
50-150 4.105e-07 1.276e-07
15-150 8.599e-07 1.030e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.75408 (-1.213 1.39451)
R1^2/D10^2 : 1.07240 (-0.566131 1.60097)
kT2 [keV] : 20.0910 (-3.7523 6.29759)
R2^2/D10^2 : 1.05684E-02 (-0.00685808 0.0139169)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.29 using 59 PHA bins.
# Reduced chi-squared = 0.8599 for 55 degrees of freedom
# Null hypothesis probability = 7.605124e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.739e-07 4.473e-08
25- 50 2.692e-07 5.917e-08
50-150 4.169e-07 1.211e-07
15-150 8.599e-07 2.147e-07
Peak spectrum fit
Power-law model
Time interval is from 16.792 sec. to 17.792 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87116 ( -0.266567 0.287546 )
Norm@50keV : 6.29462E-03 ( -0.00123085 0.00119902 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.90 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 57 degrees of freedom
# Null hypothesis probability = 4.419064e-01
Photon flux (15-150 keV) in 1 sec: 0.892485 ( -0.144802 0.144835 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.78695e-08 ( -1.10213e-08 1.13158e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 16.792 sec. to 17.792 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.594664 ( -1.52354 1.13516 )
Epeak [keV] : 48.4944 ( -13.3455 42.3917 )
Norm@50keV : 3.25192E-02 ( -0.0325134 0.201636 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.08 using 59 PHA bins.
# Reduced chi-squared = 0.9657 for 56 degrees of freedom
# Null hypothesis probability = 5.478317e-01
Photon flux (15-150 keV) in 1 sec: 0.865385 ( -0.146048 0.146345 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.33226e-08 ( -1.08539e-08 1.17233e-08 ) ergs/cm2
Band function
Time interval is from 16.792 sec. to 17.792 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.592478 ( -0.681343 2.18698 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 48.4663 ( -13.3099 42.4449 )
Norm@50keV : 3.26179E-02 ( -0.0326179 0.202453 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.08 using 59 PHA bins.
# Reduced chi-squared = 0.9833 for 55 degrees of freedom
# Null hypothesis probability = 5.097198e-01
Photon flux (15-150 keV) in 1 sec: 0.878903 ( 6.1211 -0.158378 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.32644e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.3992 (-1.93828 2.31014)
R^2/D10^2 : 0.271209 (-0.135551 0.269525)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.82 using 59 PHA bins.
# Reduced chi-squared = 1.032 for 57 degrees of freedom
# Null hypothesis probability = 4.086899e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.409e-09 2.155e-09
25- 50 2.192e-08 5.495e-09
50-150 1.652e-08 6.693e-09
15-150 4.584e-08 1.130e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 81.3666 (-30.8428 69.7679)
Norm : 4.24596 (-0.843456 1.14251)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.07 using 59 PHA bins.
# Reduced chi-squared = 0.9661 for 57 degrees of freedom
# Null hypothesis probability = 5.480075e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.103e-08 2.503e-09
25- 50 1.823e-08 4.080e-09
50-150 2.603e-08 1.582e-08
15-150 5.529e-08 1.876e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.33393 (-3.60529 23.506)
R1^2/D10^2 : 2.23931 (-1.87951 5.19771)
kT2 [keV] : 15.8487 (-4.58275 12.9445)
R2^2/D10^2 : 6.15793E-02 (-0.0575529 0.202998)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.70 using 59 PHA bins.
# Reduced chi-squared = 0.9764 for 55 degrees of freedom
# Null hypothesis probability = 5.242825e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.021e-08 5.890e-09
25- 50 1.872e-08 9.410e-09
50-150 2.369e-08 1.420e-08
15-150 5.263e-08 2.726e-08
Plot creation:
Thu Feb 5 09:42:04 EST 2015