batgrbproduct Analysis for Trigger=642296
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 Jun 3 11:23:16 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger642296/GCN5_download_cron
======================================================================
Trigger: 00642296 Segment: 000
BAT Trigger Time: 454934272 [s; MET]
Trigger Stop: 454934336 [s; MET]
UTC: 2015-06-02T10:37:38.337140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 243.471760614953 Dec: -16.2925372502415 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 13.81
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 13.81
Flight Position: [ source = BAT ]
RA: 243.471760614953 Dec: -16.2925372502415 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 243.355927943657 Dec: -16.4295674933029 [deg; J2000]
{ 16h 13m 25.4s , -16d 25' 46.4" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 3.25070407586934 [arcmin] (formal 1-sigma fit error)
SNR: -3.46585816993921
Angular difference between Flight and Ground position is 10.586192 arcmin
Partial Coding Fraction: 0.28125 [ including projection effects ]
Duration
T90: 204.555999934673 +/- 139.946051007164
Measured from: 59.3280001282692
to: 263.884000062943 [s; relative to TRIGTIME]
T50: 85.4519999623299 +/- 84.2591909611799
Measured from: 85.3400000929832
to: 170.792000055313 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 59.8960000276566
to: 60.8960000276566 [s; relative to TRIGTIME]
Total Fluence
Measured from: 55.2039999961853
to: 402.660000026226 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 13.693522 1.128408 -0.418561 -0.139346
0.270481 0.238258 0.197206 0.173974 [error]
Peak 0.082304 0.017385 0.015952 0.003509
0.015058 0.013144 0.010618 0.009140 [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 4.90e-06 6.67e-07 4.04e-08 2.59e-09 5.61e-06 5.61e-06 erg/cm2
Error 4.53e-07 1.10e-07 1.63e-08 1.79e-09 4.65e-07 4.65e-07 erg/cm2
Peak flux Power-law 8.07e-01 2.05e-01 2.74e-02 4.12e-03 1.04e+00 1.04e+00 ph/cm2/s
Error 2.65e-01 1.42e-01 4.85e-02 1.78e-02 3.52e-01 3.53e-01 ph/cm2/s
Fluence Cutoff-PL 4.92e-06 4.11e-07 1.05e-10 5.38e-19 5.33e-06 5.33e-06 erg/cm2
Error 5.07e-07 1.26e-07 8.67e-10 1.09e-14 5.15e-07 5.15e-07 erg/cm2
Peak flux Cutoff-PL 8.12e-01 1.89e-01 2.25e-02 3.08e-03 1.03e+00 1.03e+00 ph/cm2/s
Error 2.61e-01 1.49e-01 4.87e-02 1.78e-02 3.51e-01 3.52e-01 ph/cm2/s
Fluence Band 4.13e-06 1.00e-07 6.25e-10 3.90e-12 4.23e-06 4.23e-06 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 6.044 0.352 - - 1.25e-04 4.13e-05 77.580 57
CPL 1.000 0.000 50.0 0.0 2.00e-03 0.00e+00 431.310 56
The chi2 of BB fit is 61.82 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 3.903 1.441 - - 1.84e-03 2.46e-03 67.650 57
CPL 1.000 0.000 50.0 0.0 1.70e-02 0.00e+00 78.920 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 347.456 55.204 402.660
T90 204.556 59.328 263.884
T50 85.452 85.340 170.792
Peak 1.000 59.896 60.896
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
243.3559 -16.4296 0.0556 32.7 113.0 -4.2949 -3.5 TRIG_00642296
------------------------------------------
Foreground time interval of the image:
55.204 221.130 (delta_t = 165.926 [sec])
222.000 402.660 (delta_t = 180.660 [sec])
Background time interval of the image:
-8.899 55.204 (delta_t = 64.103 [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
Multiple GTIs in the spectrum
tstart tstop
55.204000 221.130000
222.000000 402.660000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.04438 ( -0.347521 0.356567 )
Norm@50keV : 1.25460E-04 ( -3.61105e-05 4.65794e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.58 using 59 PHA bins.
# Reduced chi-squared = 1.361 for 57 degrees of freedom
# Null hypothesis probability = 3.629487e-02
Photon flux (15-150 keV) in 346.6 sec: 0.539874 ( -0.0476325 0.047859 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.60768e-06 ( -4.64045e-07 4.65158e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
55.204000 221.130000
222.000000 402.660000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.99933E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 431.31 using 59 PHA bins.
# Reduced chi-squared = 7.7020 for 56 degrees of freedom
# Null hypothesis probability = 2.364056e-59
Photon flux (15-150 keV) in 346.6 sec: 0.518760 ( -0.055106 0.05382 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.32901e-06 ( -5.21009e-07 5.09883e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
55.204000 221.130000
222.000000 402.660000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.16648 ( -4.82285 -3.20031 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 11.7997 ( -0.869761 3.47044 )
Norm@50keV : 4373.78 ( -4370.06 72811.4 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.83 using 59 PHA bins.
# Reduced chi-squared = 1.124 for 55 degrees of freedom
# Null hypothesis probability = 2.452802e-01
Photon flux (15-150 keV) in 346.6 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.23348e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 2.61502 (-0.161336 0.178634)
R^2/D10^2 : 188.577 (-76.9466 128.114)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.82 using 59 PHA bins.
# Reduced chi-squared = 1.085 for 57 degrees of freedom
# Null hypothesis probability = 3.080287e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.940e-06 8.405e-07
25- 50 4.341e-07 9.402e-08
50-150 2.110e-10 1.349e-10
15-150 5.375e-06 9.843e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.56998 (-0.414408 0.480428)
Norm : 172.993 (-60.9509 94.9151)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.46 using 59 PHA bins.
# Reduced chi-squared = 1.131 for 57 degrees of freedom
# Null hypothesis probability = 2.321566e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.978e-06 6.187e-07
25- 50 5.096e-07 1.057e-07
50-150 1.645e-09 1.081e-09
15-150 5.489e-06 8.076e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.02634E-04 ( )
R1^2/D10^2 : 70.4403 (-70.4403 -70.4403)
kT2 [keV] : 2.61503 (-0.161342 0.178627)
R2^2/D10^2 : 188.573 (-76.943 128.118)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.83 using 59 PHA bins.
#Fit statistic : Chi-Squared = 61.82 using 59 PHA bins.
# Reduced chi-squared = 1.124 for 55 degrees of freedom
# Reduced chi-squared = 1.124 for 55 degrees of freedom
# Null hypothesis probability = 2.453035e-01
# Null hypothesis probability = 2.456501e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.946e-06 1.605e+01
25- 50 4.342e-07 3.159e+02
50-150 2.174e-10 7.561e+03
15-150 5.381e-06 7.166e+03
Peak spectrum fit
Power-law model
Time interval is from 59.896 sec. to 60.896 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.90336 ( -1.1544 1.7283 )
Norm@50keV : 1.83811E-03 ( -0.00183772 0.00309198 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.65 using 59 PHA bins.
# Reduced chi-squared = 1.187 for 57 degrees of freedom
# Null hypothesis probability = 1.580281e-01
Photon flux (15-150 keV) in 1 sec: 1.04232 ( -0.351989 0.351529 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.77752e-08 ( -1.5559e-08 1.92779e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 59.896 sec. to 60.896 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.70367E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.92 using 59 PHA bins.
# Reduced chi-squared = 1.409 for 56 degrees of freedom
# Null hypothesis probability = 2.349842e-02
Photon flux (15-150 keV) in 1 sec: 1.02666 ( -0.338367 0.36392 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.67846e-08 ( -1.77579e-08 2.0299e-08 ) ergs/cm2
Band function
Time interval is from 59.896 sec. to 60.896 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.87424 ( 1.86149 1.86149 )
beta : -4.05612 ( 4.15697 1.38161 )
Epeak [keV] : 1.16042 ( -1.24151 9.13745 )
Norm@50keV : 0.106347 ( -0.116447 2.82581e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.50 using 59 PHA bins.
# Reduced chi-squared = 1.227 for 55 degrees of freedom
# Null hypothesis probability = 1.201250e-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] : 2.98015 (-0.770783 1.11721)
R^2/D10^2 : 143.498 (-143.512 896.017)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.98 using 59 PHA bins.
# Reduced chi-squared = 1.193 for 57 degrees of freedom
# Null hypothesis probability = 1.514763e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.574e-08 1.515e-08
25- 50 3.665e-09 2.436e-09
50-150 5.594e-12 6.665e-12
15-150 2.941e-08 1.730e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.66542 (-2.80679 10.0147)
Norm : 89.2533 (-89.2575 432.843)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.36 using 59 PHA bins.
# Reduced chi-squared = 1.199 for 57 degrees of freedom
# Null hypothesis probability = 1.441685e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.483e-08 1.484e-08
25- 50 5.643e-09 3.599e-09
50-150 1.040e-10 1.495e-10
15-150 3.058e-08 1.829e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.72394 (-0.777597 1.0067)
R1^2/D10^2 : 229.687 (-195.761 2178.69)
kT2 [keV] : 16.2390 (-8.64879 23.5742)
R2^2/D10^2 : 3.17721E-02 (-0.0325328 0.538344)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.35 using 59 PHA bins.
# Reduced chi-squared = 1.170 for 55 degrees of freedom
# Null hypothesis probability = 1.819615e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.470e-08 1.395e-08
25- 50 9.717e-09 6.005e-09
50-150 1.364e-08 1.058e-08
15-150 4.806e-08 2.559e-08
Plot creation:
Wed Jun 3 11:27:03 EDT 2015