batgrbproduct Analysis for Trigger=645944
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 24 19:59:27 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger645944/GCN5_download_cron
======================================================================
Trigger: 00645944 Segment: 000
BAT Trigger Time: 456792142.4 [s; MET]
Trigger Stop: 456792144.448 [s; MET]
UTC: 2015-06-23T22:42:08.640740 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 267.231935988733 Dec: -20.3954418239554 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.28
Image Trigger?: NO
Rate S/N Ratio: 5.56776436283002 [ if not an image trigger ]
Image S/N Ratio: 6.28
Flight Position: [ source = BAT ]
RA: 267.231935988733 Dec: -20.3954418239554 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 267.194801857008 Dec: -20.3700682938408 [deg; J2000]
{ 17h 48m 46.8s , -20d 22' 12.2" }
+/- 2.64947514504411 [arcmin] (estimated 90% radius based on SNR)
+/- 0.965020067682544 [arcmin] (formal 1-sigma fit error)
SNR: 7.56143649314912
Angular difference between Flight and Ground position is 2.584521 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 13.6879999637604 +/- 3.04975802089782
Measured from: -1.46399986743927
to: 12.2240000963211 [s; relative to TRIGTIME]
T50: 7.05199992656708 +/- 3.66013768260136
Measured from: 0.832000136375427
to: 7.8840000629425 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.9640000462532
to: 4.9640000462532 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.65199995040894
to: 13.2880000472069 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.216384 0.035450 0.018412 0.024062
0.024384 0.021404 0.017580 0.014415 [error]
Peak 0.025440 0.006359 0.002858 0.010426
0.006217 0.005335 0.004416 0.003398 [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 5.99e-08 1.97e-08 3.63e-09 7.80e-10 8.37e-08 8.40e-08 erg/cm2
Error 1.20e-08 1.02e-08 4.81e-09 1.97e-09 2.18e-08 2.23e-08 erg/cm2
Peak flux Power-law 2.20e-01 7.09e-02 1.27e-02 2.65e-03 3.06e-01 3.06e-01 ph/cm2/s
Error 9.09e-02 4.91e-02 2.08e-02 1.07e-02 1.24e-01 1.26e-01 ph/cm2/s
Fluence Cutoff-PL 6.29e-08 1.50e-08 2.60e-10 7.68e-14 7.82e-08 7.82e-08 erg/cm2
Error 1.35e-08 1.23e-08 4.39e-09 1.68e-09 2.39e-08 2.21e-08 erg/cm2
Peak flux Cutoff-PL 2.21e-01 6.91e-02 1.18e-02 2.46e-03 3.05e-01 3.04e-01 ph/cm2/s
Error 9.07e-02 2.65e-02 2.08e-02 1.06e-02 1.24e-01 1.26e-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 4.441 0.904 - - 1.70e-04 1.54e-04 55.570 57
CPL 1.000 0.000 50.0 0.0 2.21e-03 0.00e+00 95.250 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.481 1.503 - - 7.67e-04 9.55e-04 67.190 57
CPL 1.000 0.000 50.0 0.0 5.28e-03 0.00e+00 74.390 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 15.940 -2.652 13.288
T90 13.688 -1.464 12.224
T50 7.052 0.832 7.884
Peak 1.000 3.964 4.964
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
267.1948 -20.3701 0.0254 10.0 57.9 0.3056 7.6 TRIG_00645944
------------------------------------------
Foreground time interval of the image:
-2.652 13.288 (delta_t = 15.940 [sec])
Background time interval of the image:
-239.400 -2.652 (delta_t = 236.748 [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 -2.652 sec. to 13.288 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.44139 ( -0.805282 1.00248 )
Norm@50keV : 1.69969E-04 ( -0.000111817 0.000196193 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.57 using 59 PHA bins.
# Reduced chi-squared = 0.9749 for 57 degrees of freedom
# Null hypothesis probability = 5.289265e-01
Photon flux (15-150 keV) in 15.94 sec: 0.155551 ( -0.0326121 0.032784 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.37132e-08 ( -2.06766e-08 2.2889e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.652 sec. to 13.288 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.21045E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 95.25 using 59 PHA bins.
# Reduced chi-squared = 1.701 for 56 degrees of freedom
# Null hypothesis probability = 8.364343e-04
Photon flux (15-150 keV) in 15.94 sec: 0.154219 ( -0.031317 0.031478 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.82066e-08 ( -1.75286e-08 3.03169e-08 ) ergs/cm2
Band function
Time interval is from -2.652 sec. to 13.288 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.86278 ( 8.86278 8.86278 )
beta : -4.44139 ( -1.00179 0.805383 )
Epeak [keV] : 3.85895 ( -3.85895 -3.85895 )
Norm@50keV : 2.31011E-02 ( -0.0151956 0.0266654 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.57 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 55 degrees of freedom
# Null hypothesis probability = 4.531921e-01
Photon flux (15-150 keV) in 15.94 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] : 3.24314 (-0.639409 0.762657)
R^2/D10^2 : 13.5199 (-13.5199 40.3528)
(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 = 5.347525e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.434e-08 3.631e-08
25- 50 1.221e-08 7.623e-09
50-150 3.613e-11 3.773e-11
15-150 7.659e-08 4.368e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.94396 (-2.05981 3.17208)
Norm : 12.7285 (-7.50716 23.6465)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.04 using 59 PHA bins.
# Reduced chi-squared = 0.9656 for 57 degrees of freedom
# Null hypothesis probability = 5.490201e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.277e-08 3.019e-08
25- 50 1.536e-08 9.726e-09
50-150 3.304e-10 3.371e-10
15-150 7.846e-08 4.333e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.19494 (-0.652256 0.756794)
R1^2/D10^2 : 14.6530 (-14.653 47.2285)
kT2 [keV] : 84.8667 (-84.8667 -84.8667)
R2^2/D10^2 : 2.80040E-05 (-2.8004e-05 0.00226538)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.78 using 59 PHA bins.
# Reduced chi-squared = 0.9778 for 55 degrees of freedom
# Null hypothesis probability = 5.214323e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.411e-08 3.551e-08
25- 50 1.333e-08 7.416e-09
50-150 3.241e-08 2.144e-08
15-150 1.099e-07 5.164e-08
Peak spectrum fit
Power-law model
Time interval is from 3.964 sec. to 4.964 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.48102 ( -1.14639 1.85946 )
Norm@50keV : 7.67256E-04 ( -0.000767256 0.0011427 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.19 using 59 PHA bins.
# Reduced chi-squared = 1.179 for 57 degrees of freedom
# Null hypothesis probability = 1.675045e-01
Photon flux (15-150 keV) in 1 sec: 0.305573 ( -0.123764 0.124938 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1934e-08 ( -5.81635e-09 7.4853e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.964 sec. to 4.964 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 5.28377E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.39 using 59 PHA bins.
# Reduced chi-squared = 1.328 for 56 degrees of freedom
# Null hypothesis probability = 5.061498e-02
Photon flux (15-150 keV) in 1 sec: 0.304678 ( -0.123035 0.124895 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18784e-08 ( -7.74088e-09 7.2951e-09 ) ergs/cm2
Band function
Time interval is from 3.964 sec. to 4.964 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.61271 ( 1.6058 1.6058 )
beta : -4.19326 ( 4.37123 6.86131 )
Epeak [keV] : 5.14631 ( -5.0385 11.0524 )
Norm@50keV : 2.03963E-02 ( -0.0144021 93026.9 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.07 using 59 PHA bins.
# Reduced chi-squared = 1.219 for 55 degrees of freedom
# Null hypothesis probability = 1.274263e-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] : 4.27524 (-1.53647 2.067)
R^2/D10^2 : 5.64779 (-5.64779 58.8505)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.16 using 59 PHA bins.
# Reduced chi-squared = 1.178 for 57 degrees of freedom
# Null hypothesis probability = 1.679993e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.026e-09 4.283e-09
25- 50 3.055e-09 2.166e-09
50-150 5.477e-11 5.525e-11
15-150 1.014e-08 6.450e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.2413 (-6.09779 17.8347)
Norm : 8.37691 (-8.37691 42.3884)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.12 using 59 PHA bins.
# Reduced chi-squared = 1.178 for 57 degrees of freedom
# Null hypothesis probability = 1.689204e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.837e-09 4.105e-09
25- 50 3.420e-09 2.398e-09
50-150 3.181e-10 3.158e-10
15-150 1.058e-08 6.640e-09
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.17106 (-1.57576 1.81753)
R1^2/D10^2 : 6.27216 ( )
kT2 [keV] : 199.239 (-199.297 -199.297)
R2^2/D10^2 : 2.87175E-05 (-2.87554e-05 -2.87554e-05)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.70 using 59 PHA bins.
#Fit statistic : Chi-Squared = 65.52 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 55 degrees of freedom
# Reduced chi-squared = 1.191 for 55 degrees of freedom
# Null hypothesis probability = 1.531595e-01
# Null hypothesis probability = 1.568033e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.970e-09 3.962e-09
25- 50 3.198e-09 2.014e-09
50-150 7.824e-09 3.527e-09
15-150 1.799e-08 7.570e-09
Plot creation:
Wed Jun 24 20:03:31 EDT 2015