batgrbproduct Analysis for Trigger=649113
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 Jul 16 18:53:57 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger649113/GCN5_download_cron
======================================================================
Trigger: 00649113 Segment: 000
BAT Trigger Time: 458676772.936 [s; MET]
Trigger Stop: 458676772.952 [s; MET]
UTC: 2015-07-15T18:12:38.078520 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 280.330403306656 Dec: -4.92993454447609 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 13.64
Image Trigger?: NO
Rate S/N Ratio: 70.6753139363385 [ if not an image trigger ]
Image S/N Ratio: 13.64
Flight Position: [ source = BAT ]
RA: 280.330403306656 Dec: -4.92993454447609 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 280.319996339533 Dec: -4.94160181880574 [deg; J2000]
{ 18h 41m 16.8s , -04d 56' 29.8" }
+/- 1.40307763537888 [arcmin] (estimated 90% radius based on SNR)
+/- 0.486672020760115 [arcmin] (formal 1-sigma fit error)
SNR: 18.7500168612014
Angular difference between Flight and Ground position is 0.936516 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 0.0399999618530273 +/- 0.00894429003608426
Measured from: 1.19209289550781e-07
to: 0.0400000810623169 [s; relative to TRIGTIME]
T50: 0.0119999647140503 +/- 0.0079999566078186
Measured from: 0.00400012731552124
to: 0.0160000920295715 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.476000010967255
to: 0.523999989032745 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0440000295639038 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.028378 0.036393 0.014592 0.000066
0.002435 0.002775 0.001941 0.000958 [error]
Peak 0.024039 0.045863 0.019788 0.006593
0.006167 0.006060 0.005005 0.004177 [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 1.01e-08 7.11e-09 3.31e-09 2.16e-09 2.15e-08 2.27e-08 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 2.89e-01 2.61e-01 1.63e-01 1.54e-01 7.78e-01 8.68e-01 ph/cm2/s
Error 7.76e-02 4.70e-02 3.95e-02 7.25e-02 1.39e-01 1.56e-01 ph/cm2/s
Fluence Cutoff-PL 6.87e-09 1.60e-08 8.63e-09 5.41e-10 3.20e-08 3.20e-08 erg/cm2
Error 1.41e-09 1.75e-09 1.60e-09 2.70e-10 3.09e-09 3.10e-09 erg/cm2
Peak flux Cutoff-PL 1.95e-01 3.44e-01 1.54e-01 9.39e-03 7.01e-01 7.02e-01 ph/cm2/s
Error 9.70e-02 7.21e-02 5.42e-02 2.71e-02 1.40e-01 1.46e-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 3.104 0.000 - - 3.88e-02 0.00e+00 141.920 57
CPL -1.162 0.856 38.9 3.4 7.33e+00 0.00e+00 55.430 56
The chi2 of BB fit is 55.24 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 1.683 0.293 - - 5.89e-03 1.14e-03 59.710 57
CPL -1.420 2.631 47.1 11.1 3.12e-01 7.94e+00 52.700 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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.044 0.000 0.044
T90 0.040 0.000 0.040
T50 0.012 0.004 0.016
Peak 1.000 -0.476 0.524
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
280.3200 -4.9416 0.0102 16.4 -22.7 0.0802 18.8 TRIG_00649113
------------------------------------------
Foreground time interval of the image:
0.000 0.044 (delta_t = 0.044 [sec])
Background time interval of the image:
-119.936 0.000 (delta_t = 119.936 [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 0.000 sec. to 0.044 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.10362 ( )
Norm@50keV : 3.87755E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 141.92 using 59 PHA bins.
# Reduced chi-squared = 2.4899 for 57 degrees of freedom
# Null hypothesis probability = 3.414734e-09
Photon flux (15-150 keV) in 0.044 sec: 11.5105 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.15373e-08 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.044 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.16207 ( -0.913284 0.798234 )
Epeak [keV] : 38.8595 ( -3.7176 3.18009 )
Norm@50keV : 7.33406 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.43 using 59 PHA bins.
# Reduced chi-squared = 0.9898 for 56 degrees of freedom
# Null hypothesis probability = 4.965010e-01
Photon flux (15-150 keV) in 0.044 sec: 13.3707 ( -1.3319 1.3375 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.19789e-08 ( -3.09228e-09 3.09531e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.044 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.16632 ( -0.53176 0.884222 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 38.8535 ( -3.72964 2.38152 )
Norm@50keV : 7.37969 ( -4.4543 14.1438 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.44 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 55 degrees of freedom
# Null hypothesis probability = 4.580085e-01
Photon flux (15-150 keV) in 0.044 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] : 10.3620 (-0.700415 0.646979)
R^2/D10^2 : 6.45239 (-1.46108 2.05337)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.24 using 59 PHA bins.
# Reduced chi-squared = 0.9691 for 57 degrees of freedom
# Null hypothesis probability = 5.415272e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.278e-09 9.174e-10
25- 50 1.640e-08 1.690e-09
50-150 9.478e-09 1.857e-09
15-150 3.216e-08 3.199e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 30.2106 (-3.01333 3.05963)
Norm : 110.696 (-14.8148 16.27)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.99 using 59 PHA bins.
# Reduced chi-squared = 1.509 for 57 degrees of freedom
# Null hypothesis probability = 7.825704e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.948e-09 1.173e-09
25- 50 1.141e-08 1.100e-09
50-150 6.307e-09 1.122e-09
15-150 2.767e-08 2.820e-09
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.87620 (-0.785747 1.36232)
R1^2/D10^2 : 9276.16 ( )
kT2 [keV] : 10.7495 (-0.722468 0.689655)
R2^2/D10^2 : 5.27149 (-1.34149 1.78453)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.67 using 59 PHA bins.
#Fit statistic : Chi-Squared = 45.64 using 59 PHA bins.
# Reduced chi-squared = 0.8304 for 55 degrees of freedom
# Reduced chi-squared = 0.8298 for 55 degrees of freedom
# Null hypothesis probability = 8.107401e-01
# Null hypothesis probability = 8.117021e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.703e-09 1.662e-09
25- 50 1.539e-08 1.927e-09
50-150 9.790e-09 1.824e-09
15-150 3.288e-08 3.718e-09
Peak spectrum fit
Power-law model
Time interval is from -0.476 sec. to 0.524 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68329 ( -0.287296 0.29865 )
Norm@50keV : 5.89312E-03 ( -0.00114514 0.00112607 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.71 using 59 PHA bins.
# Reduced chi-squared = 1.048 for 57 degrees of freedom
# Null hypothesis probability = 3.775376e-01
Photon flux (15-150 keV) in 1 sec: 0.778151 ( -0.138822 0.138988 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.46406e-08 ( -1.09649e-08 1.12303e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.476 sec. to 0.524 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.41956 ( -3.11939 2.14342 )
Epeak [keV] : 47.1225 ( -7.04533 15.2215 )
Norm@50keV : 0.311881 ( -0.336425 15.5454 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.70 using 59 PHA bins.
# Reduced chi-squared = 0.9411 for 56 degrees of freedom
# Null hypothesis probability = 6.005609e-01
Photon flux (15-150 keV) in 1 sec: 0.701348 ( -0.133572 0.146164 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.36646e-08 ( -9.3168e-09 1.15164e-08 ) ergs/cm2
Band function
Time interval is from -0.476 sec. to 0.524 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.46566 ( -2.30574 -1.66 )
beta : -3.87503 ( 3.93385 1.90836 )
Epeak [keV] : 46.9146 ( -11.272 8.60275 )
Norm@50keV : 0.333128 ( -0.331493 29.1043 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.30 using 59 PHA bins.
# Reduced chi-squared = 0.9509 for 55 degrees of freedom
# Null hypothesis probability = 5.785408e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.58173e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.0570 (-1.7733 2.14561)
R^2/D10^2 : 0.202953 (-0.0937556 0.162663)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.63 using 59 PHA bins.
# Reduced chi-squared = 0.9233 for 57 degrees of freedom
# Null hypothesis probability = 6.395789e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.243e-09 2.164e-09
25- 50 1.976e-08 4.535e-09
50-150 1.732e-08 7.520e-09
15-150 4.332e-08 1.120e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 116.192 (-52.5755 -114.447)
Norm : 3.36582 (-0.663538 0.938629)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.52 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 57 degrees of freedom
# Null hypothesis probability = 4.557625e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.777e-09 4.367e-09
25- 50 1.561e-08 8.810e-09
50-150 2.742e-08 1.846e-08
15-150 5.181e-08 3.216e-08
Double BB
R1^2/D10^2 : 2.43774E+06 ( )
kT2 [keV] : 12.3403 (-1.88907 2.25963)
R2^2/D10^2 : 0.183284 (-0.0866831 0.114112)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.63 using 59 PHA bins.
#Fit statistic : Chi-Squared = 51.25 using 59 PHA bins.
#Fit statistic : Chi-Squared = 51.06 using 59 PHA bins.
# Reduced chi-squared = 0.9569 for 55 degrees of freedom
# Reduced chi-squared = 0.9318 for 55 degrees of freedom
# Reduced chi-squared = 0.9284 for 55 degrees of freedom
# Null hypothesis probability = 5.657016e-01
# Null hypothesis probability = 6.187089e-01
# Null hypothesis probability = 6.258981e-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:
Thu Jul 16 18:56:37 EDT 2015