batgrbproduct Analysis for Trigger=597860
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 May 7 10:02:47 EDT 2014
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger597860/batgroup_hand_proc
======================================================================
Trigger: 00597860 Segment: 000
BAT Trigger Time: 420732848 [s; MET]
Trigger Stop: 420732912 [s; MET]
UTC: 2014-05-02T14:13:56.040020 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 199.68129915543 Dec: -35.6309687712649 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.06
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.06
Flight Position: [ source = BAT ]
RA: 199.68129915543 Dec: -35.6309687712649 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 199.779176532752 Dec: -35.6904353504179 [deg; J2000]
{ 13h 19m 07.0s , -35d 41' 25.6" }
+/- 4.98097969565556 [arcmin] (estimated 90% radius based on SNR)
+/- 3.17332118292271 [arcmin] (formal 1-sigma fit error)
SNR: 3.06869991190152
Angular difference between Flight and Ground position is 5.957943 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 55.2960000038147 +/- 21.2427222502462
Measured from: 4.00800001621246
to: 59.3040000200272 [s; relative to TRIGTIME]
T50: 24.8960000276566 +/- 20.7507108738477
Measured from: 24.8719999790192
to: 49.7680000066757 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 48.4679999947548
to: 49.4679999947548 [s; relative to TRIGTIME]
Total Fluence
Measured from: 1.19199997186661
to: 67.2400000095367 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.231422 0.151545 0.076994 0.015884
0.047527 0.042670 0.035749 0.030531 [error]
Peak 0.005033 0.014144 0.005666 0.006453
0.005748 0.005186 0.004473 0.003637 [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 5.95e-08 6.98e-08 5.90e-08 8.43e-08 2.18e-07 2.73e-07 erg/cm2
Error 2.09e-08 2.01e-08 3.27e-08 1.06e-07 7.43e-08 1.35e-07 erg/cm2
Peak flux Power-law 9.34e-02 8.22e-02 4.96e-02 4.52e-02 2.45e-01 2.70e-01 ph/cm2/s
Error 7.23e-02 6.18e-02 3.53e-02 7.42e-02 1.23e-01 1.36e-01 ph/cm2/s
Fluence Cutoff-PL 5.82e-08 7.23e-08 5.83e-08 5.03e-08 2.13e-07 2.39e-07 erg/cm2
Error 2.35e-08 2.55e-08 3.09e-08 1.05e-07 7.70e-08 1.41e-07 erg/cm2
Peak flux Cutoff-PL 6.59e-02 1.01e-01 4.66e-02 4.08e-03 2.17e-01 2.19e-01 ph/cm2/s
Error 8.41e-02 6.28e-02 4.59e-02 6.95e-02 1.35e-01 1.52e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.243 0.600 - - 3.49e-04 1.42e-04 50.460 57
CPL 1.927 0.000 9.6 0.0 5.33e-04 0.00e+00 50.410 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 1.728 1.044 - - 1.82e-03 1.41e-03 42.040 57
CPL 0.018 1.085 50.3 -7.8 1.60e-02 3.77e+03 41.780 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 66.048 1.192 67.240
T90 55.296 4.008 59.304
T50 24.896 24.872 49.768
Peak 1.000 48.468 49.468
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
199.7792 -35.6904 0.0628 14.7168 8.5585 0.5829020 3.069 TRIG_00597860
Foreground time interval of the image:
1.192 67.240 (delta_t = 66.048 [sec])
Background time interval of the image:
-13.299 1.192 (delta_t = 14.491 [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 1.192 sec. to 67.240 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.24314 ( -0.527239 0.671837 )
Norm@50keV : 3.49360E-04 ( -0.000146828 0.000136768 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.46 using 59 PHA bins.
# Reduced chi-squared = 0.8853 for 57 degrees of freedom
# Null hypothesis probability = 7.171906e-01
Photon flux (15-150 keV) in 66.05 sec: 5.91814E-02 ( -0.0156466 0.0156466 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.18365e-07 ( -7.18023e-08 7.68551e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.192 sec. to 67.240 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92748 ( )
Epeak [keV] : 9.58817 ( )
Norm@50keV : 5.32934E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.41 using 59 PHA bins.
# Reduced chi-squared = 0.9002 for 56 degrees of freedom
# Null hypothesis probability = 6.855417e-01
Photon flux (15-150 keV) in 66.05 sec: 5.86174E-02 ( -0.0161085 0.01598 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.13278e-07 ( -7.32184e-08 8.07157e-08 ) ergs/cm2
Band function
Time interval is from 1.192 sec. to 67.240 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.99749 ( -0.00254041 0.550134 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 0.417431 ( -0.417432 -0.417432 )
Norm@50keV : 4.87265E-04 ( -0.000128721 0.000128724 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.41 using 59 PHA bins.
# Reduced chi-squared = 0.9166 for 55 degrees of freedom
# Null hypothesis probability = 6.503574e-01
Photon flux (15-150 keV) in 66.05 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] : 9.84701 (-2.88904 3.53964)
R^2/D10^2 : 2.84583E-02 (-0.0284142 0.0803295)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.84 using 59 PHA bins.
# Reduced chi-squared = 0.9446 for 57 degrees of freedom
# Null hypothesis probability = 5.943180e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.692e-08 2.111e-08
25- 50 8.979e-08 5.380e-08
50-150 4.481e-08 3.203e-08
15-150 1.715e-07 9.832e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 48.7963 (-25.0842 80.0719)
Norm : 0.337962 (-0.129696 0.252286)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.62 using 59 PHA bins.
# Reduced chi-squared = 0.8881 for 57 degrees of freedom
# Null hypothesis probability = 7.115538e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.427e-08 2.210e-08
25- 50 7.727e-08 4.480e-08
50-150 7.330e-08 5.354e-08
15-150 2.048e-07 1.024e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.96983 (-1.94257 2.73138)
R1^2/D10^2 : 55.4080 (-67.713 -68.0406)
kT2 [keV] : 11.9904 (-3.63139 6.12875)
R2^2/D10^2 : 1.19246E-02 (-0.011197 0.0305297)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.94 using 59 PHA bins.
# Reduced chi-squared = 0.8717 for 55 degrees of freedom
# Null hypothesis probability = 7.388742e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.334e-08 2.569e-08
25- 50 7.604e-08 4.515e-08
50-150 6.506e-08 4.548e-08
15-150 1.944e-07 1.053e-07
Peak spectrum fit
Power-law model
Time interval is from 48.468 sec. to 49.468 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.72826 ( -0.950479 1.13785 )
Norm@50keV : 1.82309E-03 ( -0.00182309 0.000991139 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.04 using 59 PHA bins.
# Reduced chi-squared = 0.7376 for 57 degrees of freedom
# Null hypothesis probability = 9.308753e-01
Photon flux (15-150 keV) in 1 sec: 0.244566 ( -0.122817 0.123481 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.68449e-08 ( -9.36718e-09 1.01252e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 48.468 sec. to 49.468 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.78545E-02 ( 0.0611433 2.23109 )
Epeak [keV] : 50.3391 ( -33.9852 -49.6804 )
Norm@50keV : 1.59604E-02 ( -0.0210121 7542.82 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.78 using 59 PHA bins.
# Reduced chi-squared = 0.7461 for 56 degrees of freedom
# Null hypothesis probability = 9.211786e-01
Photon flux (15-150 keV) in 1 sec: 0.217253 ( -0.126007 0.143728 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3623e-08 ( -8.17162e-09 1.27555e-08 ) ergs/cm2
Band function
Time interval is from 48.468 sec. to 49.468 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.67111 ( 0.867515 0.867515 )
beta : -2.88769 ( 3.09034 3.19983 )
Epeak [keV] : 44.3437 ( -30.5844 93.1822 )
Norm@50keV : 0.148028 ( -0.142921 11.5849 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.64 using 59 PHA bins.
# Reduced chi-squared = 0.7572 for 55 degrees of freedom
# Null hypothesis probability = 9.080906e-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] : 11.8830 (-4.74317 9.06926)
R^2/D10^2 : 6.39643E-02 (-0.0639644 0.345858)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.76 using 59 PHA bins.
# Reduced chi-squared = 0.7327 for 57 degrees of freedom
# Null hypothesis probability = 9.351023e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.909e-09 1.302e-09
25- 50 5.938e-09 3.905e-09
50-150 5.008e-09 4.066e-09
15-150 1.285e-08 8.780e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 118.226 (-115.049 -115.049)
Norm : 1.03842 (-0.552019 1.34613)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.95 using 59 PHA bins.
# Reduced chi-squared = 0.7359 for 57 degrees of freedom
# Null hypothesis probability = 9.323615e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.706e-09 1.779e-09
25- 50 4.829e-09 3.102e-09
50-150 8.555e-09 6.500e-09
15-150 1.609e-08 1.100e-08
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.76 using 59 PHA bins.
#Fit statistic : Chi-Squared = 38.74 using 59 PHA bins.
#Fit statistic : Chi-Squared = 38.52 using 59 PHA bins.
#Fit statistic : Chi-Squared = 38.48 using 59 PHA bins.
# Reduced chi-squared = 0.7593 for 55 degrees of freedom
# Reduced chi-squared = 0.7043 for 55 degrees of freedom
# Reduced chi-squared = 0.7003 for 55 degrees of freedom
# Reduced chi-squared = 0.6996 for 55 degrees of freedom
# Null hypothesis probability = 9.058623e-01
# Null hypothesis probability = 9.526990e-01
# Null hypothesis probability = 9.552752e-01
# Null hypothesis probability = 9.556861e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Wed May 7 10:10:01 EDT 2014