batgrbproduct Analysis for Trigger=675784
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 25 11:07:31 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger675784/GCN5_download_cron
======================================================================
Trigger: 00675784 Segment: 000
BAT Trigger Time: 478014272 [s; MET]
Trigger Stop: 478014336 [s; MET]
UTC: 2016-02-24T13:44:16.111260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 294.956450826085 Dec: -10.3222732546401 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.05
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 6.05
Flight Position: [ source = BAT ]
RA: 294.956450826085 Dec: -10.3222732546401 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 294.934261882868 Dec: -10.3254213919588 [deg; J2000]
{ 19h 39m 44.2s , -10d 19' 31.5" }
+/- 3.21452529058528 [arcmin] (estimated 90% radius based on SNR)
+/- 1.58526111998001 [arcmin] (formal 1-sigma fit error)
SNR: 5.73674758469873
Angular difference between Flight and Ground position is 1.323333 arcmin
Partial Coding Fraction: 0.8671875 [ including projection effects ]
Duration
T90: 0.0239999890327454 +/- 0.0113137314268704
Measured from: -127.039999902248
to: -127.015999913216 [s; relative to TRIGTIME]
T50: 0.0079999566078186 +/- 0.0113137314268704
Measured from: -127.031999886036
to: -127.023999929428 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -127.523999989033
to: -126.523999989033 [s; relative to TRIGTIME]
Total Fluence
Measured from: -127.040000021458
to: -127.012000024319 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.003774 0.002986 0.000311 0.001802
0.000968 0.001002 0.000739 0.000760 [error]
Peak 0.001615 0.003876 0.006783 0.001121
0.006117 0.005787 0.004853 0.004206 [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 8.93e-10 4.53e-10 1.50e-10 5.73e-11 1.54e-09 1.52e-09 erg/cm2
Error 3.87e-10 2.65e-10 1.60e-10 1.10e-10 7.22e-10 7.54e-10 erg/cm2
Peak flux Power-law 2.51e-021.82e-061.10e-06 3.61e-022.86e-051.83e-05 3.87e-024.15e-042.23e-04 7.72e-023.54e-02 1.24e-012.13e-031.19e-03 1.77e-013.56e-02 ph/cm2/s
Error 5.90e-02 4.30e-02 3.79e-02 3.94e-01 1.29e-01 4.05e-01 ph/cm2/s
Fluence Cutoff-PL 1.07e-09 8.67e-10 2.06e-11 5.63e-16 1.96e-09 1.96e-09 erg/cm2
Error 4.87e-10 4.86e-10 8.65e-11 1.33e-12 7.25e-10 7.25e-10 erg/cm2
Peak flux Cutoff-PL 2.74e-02 3.77e-02 3.83e-02 7.07e-02 1.26e-01 1.75e-01 ph/cm2/s
Error 5.91e-02 4.31e-02 4.55e-02 -------- 1.29e-01 -------- 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 3.655 0.899 - - 3.15e-03 2.96e-03 44.520 57
CPL 1.000 0.000 50.0 0.0 7.48e-03 0.00e+00 57.250 56
The chi2 of BB fit is 37.54 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 -2.946 0.000 - - 1.55e-06 1.49e-06 55.110 57
CPL -5.597 0.000 9999.4 0.0 7.15e-10 0.00e+00 55.080 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.028 -127.040 -127.012
T90 0.024 -127.040 -127.016
T50 0.008 -127.032 -127.024
Peak 1.000 -127.524 -126.524
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
294.9343 -10.3254 0.0336 15.1 -81.1 0.0102 5.7 TRIG_00675784
------------------------------------------
Foreground time interval of the image:
-127.040 -127.012 (delta_t = 0.028 [sec])
Background time interval of the image:
-142.899 -127.040 (delta_t = 15.859 [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 -127.040 sec. to -127.012 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.65489 ( -0.703055 1.09421 )
Norm@50keV : 3.14547E-03 ( -0.00313813 0.00278712 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.52 using 59 PHA bins.
# Reduced chi-squared = 0.7810 for 57 degrees of freedom
# Null hypothesis probability = 8.856786e-01
Photon flux (15-150 keV) in 0.028 sec: 1.44566 ( -0.625755 0.626064 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.53949e-09 ( -6.83015e-10 7.6099e-10 ) ergs/cm2
Cutoff power-law model
Time interval is from -127.040 sec. to -127.012 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 7.47887E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.25 using 59 PHA bins.
# Reduced chi-squared = 1.022 for 56 degrees of freedom
# Null hypothesis probability = 4.285156e-01
Photon flux (15-150 keV) in 0.028 sec: 1.84361 ( -0.66286 0.66174 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.95514e-09 ( -7.13034e-10 7.36417e-10 ) ergs/cm2
Band function
Time interval is from -127.040 sec. to -127.012 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.74844 ( 0.71543 9.74844 )
beta : -3.68322 ( -1.09166 0.705642 )
Epeak [keV] : 66.5091 ( -66.5091 -66.5091 )
Norm@50keV : 0.416672 ( -0.42144 0.383897 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.52 using 59 PHA bins.
# Reduced chi-squared = 0.8094 for 55 degrees of freedom
# Null hypothesis probability = 8.429262e-01
Photon flux (15-150 keV) in 0.028 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] : 5.45704 (-1.32621 1.48246)
R^2/D10^2 : 11.2172 (-11.2176 29.4902)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.54 using 59 PHA bins.
# Reduced chi-squared = 0.6586 for 57 degrees of freedom
# Null hypothesis probability = 9.783004e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.070e-09 6.363e-10
25- 50 8.621e-10 5.650e-10
50-150 5.263e-11 5.369e-11
15-150 1.985e-09 1.251e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.5004 (-4.96502 7.53517)
Norm : 35.6308 (-13.4561 13.4561)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.32 using 59 PHA bins.
# Reduced chi-squared = 0.7073 for 57 degrees of freedom
# Null hypothesis probability = 9.538692e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.056e-09 1.209e-09
25- 50 6.505e-10 1.349e-09
50-150 9.265e-11 5.702e-10
15-150 1.799e-09 3.279e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.46614 (-5.46141 -5.46141)
R1^2/D10^2 : 6.64250 (-6.64182 -6.64182)
kT2 [keV] : 5.44454 (-5.45608 -5.45608)
R2^2/D10^2 : 4.57272 (-4.57324 -4.57324)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.54 using 59 PHA bins.
# Reduced chi-squared = 0.6826 for 55 degrees of freedom
# Null hypothesis probability = 9.654119e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.070e-09 4.252e-02
25- 50 8.623e-10 3.840e-01
50-150 5.266e-11 9.934e+00
15-150 1.985e-09 9.412e+00
Peak spectrum fit
Power-law model
Time interval is from -127.524 sec. to -126.524 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.94613 ( 2.94613 2.94613 )
Norm@50keV : 1.54742E-06 ( -1.54742e-06 1.43363e-06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.11 using 59 PHA bins.
# Reduced chi-squared = 0.9669 for 57 degrees of freedom
# Null hypothesis probability = 5.462421e-01
Photon flux (15-150 keV) in 1 sec: 0.123699 2.13061E-03 1.19353E-03 ( -0.123699 0.134552 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.91954e-18 ( -1.19003e-08 1.21173e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -127.524 sec. to -126.524 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -5.59689 ( 5.59689 5.59689 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 7.14672E-10 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.08 using 59 PHA bins.
# Reduced chi-squared = 0.9836 for 56 degrees of freedom
# Null hypothesis probability = 5.095910e-01
Photon flux (15-150 keV) in 1 sec: 0.125768 2.72488E-08 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.1292e-23 ( 0 0 ) ergs/cm2
Band function
Time interval is from -127.524 sec. to -126.524 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.921291 ( 0.921291 0.921291 )
beta : 6.31340 ( -6.3134 -6.3134 )
Epeak [keV] : 35.6418 ( -35.6418 -35.6418 )
Norm@50keV : 7.94789E-14 ( -7.94789e-14 1.332e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.08 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 55 degrees of freedom
# Null hypothesis probability = 4.715411e-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] : 38.4806 (-38.2522 -38.2522)
R^2/D10^2 : 8.75442E-04 (-0.000896236 -0.000896236)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.41 using 59 PHA bins.
# Reduced chi-squared = 0.9722 for 57 degrees of freedom
# Null hypothesis probability = 5.347523e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.719e-10 1.328e-10
25- 50 1.159e-09 9.075e-10
50-150 1.055e-08 8.515e-09
15-150 1.189e-08 7.895e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.361 (-199.363 -199.363)
Norm : 0.531497 (-0.531947 0.531607)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.55 using 59 PHA bins.
# Reduced chi-squared = 0.9746 for 57 degrees of freedom
# Null hypothesis probability = 5.294512e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.324e-09 1.059e-09
25- 50 2.546e-09 2.068e-09
50-150 5.584e-09 4.563e-09
15-150 9.453e-09 7.290e-09
Double BB
# Reduced chi-squared = 0.9912 for 55 degrees of freedom
# Reduced chi-squared = 0.9901 for 55 degrees of freedom
# Reduced chi-squared = 0.9894 for 55 degrees of freedom
# Reduced chi-squared = 0.9891 for 55 degrees of freedom
# Reduced chi-squared = 0.9889 for 55 degrees of freedom
# Null hypothesis probability = 4.838294e-01
# Null hypothesis probability = 4.851460e-01
# Null hypothesis probability = 4.896080e-01
# Null hypothesis probability = 4.929975e-01
# Null hypothesis probability = 4.954096e-01
# Null hypothesis probability = 4.967628e-01
# Null hypothesis probability = 4.974789e-01
# Null hypothesis probability = 4.978791e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.416e-09 1.055e-09
25- 50 1.896e-09 1.131e-09
50-150 1.018e-08 6.790e-09
15-150 1.349e-08 7.875e-09
Plot creation:
Thu Feb 25 11:16:30 EST 2016