batgrbproduct Analysis for Trigger=655452
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): Mon Sep 14 09:31:18 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger655452/GCN5_download_cron
======================================================================
Trigger: 00655452 Segment: 000
BAT Trigger Time: 463837672 [s; MET]
Trigger Stop: 463837736 [s; MET]
UTC: 2015-09-13T11:47:36.871380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 256.041810055141 Dec: -38.0781799354451 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 19.15
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 19.15
Flight Position: [ source = BAT ]
RA: 256.041810055141 Dec: -38.0781799354451 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 256.088167192281 Dec: -38.0852820039571 [deg; J2000]
{ 17h 04m 21.2s , -38d 05' 07.0" }
+/- 2.70768019983478 [arcmin] (estimated 90% radius based on SNR)
+/- 1.53147645364262 [arcmin] (formal 1-sigma fit error)
SNR: 7.33030657237635
Angular difference between Flight and Ground position is 2.230434 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 220.115999937057 +/- 14.0036566776134
Measured from: 28.7600001096725
to: 248.87600004673 [s; relative to TRIGTIME]
T50: 174.007999897003 +/- 9.98852622906301
Measured from: 47.2760001420975
to: 221.284000039101 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 45.9639999866486
to: 46.9639999866486 [s; relative to TRIGTIME]
Total Fluence
Measured from: 20.6200000047684
to: 260.263999998569 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.900830 1.633655 0.446354 0.084677
0.079684 0.072768 0.058514 0.047997 [error]
Peak 0.032577 0.024622 0.013892 0.003736
0.006833 0.006275 0.004978 0.004002 [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-07 6.00e-07 4.25e-07 4.80e-07 1.81e-06 2.10e-06 erg/cm2
Error 4.75e-08 3.61e-08 4.97e-08 1.07e-07 1.17e-07 1.74e-07 erg/cm2
Peak flux Power-law 2.70e-01 1.84e-01 8.19e-02 5.06e-02 5.60e-01 5.86e-01 ph/cm2/s
Error 9.21e-02 4.85e-02 3.80e-02 4.43e-02 1.44e-01 1.53e-01 ph/cm2/s
Fluence Cutoff-PL 5.49e-07 6.70e-07 3.35e-07 5.78e-08 1.60e-06 1.61e-06 erg/cm2
Error 5.40e-08 4.90e-08 7.26e-08 6.42e-08 1.33e-07 1.50e-07 erg/cm2
Peak flux Cutoff-PL 2.54e-01 2.00e-01 8.08e-02 2.04e-02 5.51e-01 5.56e-01 ph/cm2/s
Error 1.02e-01 6.22e-02 4.34e-02 3.20e-02 1.08e-01 1.58e-01 ph/cm2/s
Fluence Band 5.36e-07 6.69e-07 3.40e-07 2.11e-07 1.65e-06 1.77e-06 erg/cm2
Error 5.50e-08 4.89e-08 6.56e-08 1.77e-07 1.32e-07 2.16e-07 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 2.497 0.122 - - 1.49e-03 1.26e-04 59.770 57
CPL 1.190 0.717 22.3 9.8 9.67e-03 0.00e+00 46.240 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.166 0.506 - - 3.44e-03 1.23e-03 46.800 57
CPL 1.456 1.428 31.4 0.0 9.02e-03 0.00e+00 46.290 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 239.644 20.620 260.264
T90 220.116 28.760 248.876
T50 174.008 47.276 221.284
Peak 1.000 45.964 46.964
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
256.0882 -38.0853 0.0261 0.1 108.2 0.9243 7.3 TRIG_00655452
------------------------------------------
Foreground time interval of the image:
20.620 63.046 (delta_t = 42.426 [sec])
181.000 188.001 (delta_t = 7.001 [sec])
Background time interval of the image:
-10.000 20.620 (delta_t = 30.620 [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
20.620000 63.045900
181.000000 260.264000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.49656 ( -0.120178 0.12446 )
Norm@50keV : 1.48826E-03 ( -0.000126324 0.000125598 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.77 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 57 degrees of freedom
# Null hypothesis probability = 3.755254e-01
Photon flux (15-150 keV) in 121.7 sec: 0.291748 ( -0.0172264 0.0172515 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80947e-06 ( -1.16438e-07 1.1772e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
20.620000 63.045900
181.000000 260.264000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18964 ( -0.777712 0.657239 )
Epeak [keV] : 22.3196 ( -14.012 5.67098 )
Norm@50keV : 9.67107E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.24 using 59 PHA bins.
# Reduced chi-squared = 0.8256 for 56 degrees of freedom
# Null hypothesis probability = 8.208263e-01
Photon flux (15-150 keV) in 121.7 sec: 0.275995 ( -0.018531 0.018636 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.60258e-06 ( -1.27858e-07 1.39067e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
20.620000 63.045900
181.000000 260.264000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.599838 ( -1.01078 1.78697 )
beta : -3.14813 ( 3.15127 0.400678 )
Epeak [keV] : 24.4568 ( -8.86447 3.6492 )
Norm@50keV : 2.51635E-02 ( -0.0265458 0.543826 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.22 using 59 PHA bins.
# Reduced chi-squared = 0.8040 for 55 degrees of freedom
# Null hypothesis probability = 8.506075e-01
Photon flux (15-150 keV) in 121.7 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6531e-06 ( -1.65225e-06 -1.30548e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.69996 (-0.462169 0.491288)
R^2/D10^2 : 0.355000 (-0.0828785 0.108513)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.53 using 59 PHA bins.
# Reduced chi-squared = 1.255 for 57 degrees of freedom
# Null hypothesis probability = 9.325557e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.496e-07 4.466e-08
25- 50 7.355e-07 4.984e-08
50-150 1.700e-07 3.414e-08
15-150 1.355e-06 7.971e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 32.6224 (-4.1203 4.95974)
Norm : 2.15128 (-0.266417 0.310338)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.29 using 59 PHA bins.
# Reduced chi-squared = 0.8121 for 57 degrees of freedom
# Null hypothesis probability = 8.438505e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.548e-07 4.582e-08
25- 50 6.629e-07 4.120e-08
50-150 4.041e-07 7.235e-08
15-150 1.622e-06 1.126e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.50287 (-1.48311 1.16028)
R1^2/D10^2 : 1.07184 (-0.503664 2.06559)
kT2 [keV] : 14.1473 (-4.07422 9.59497)
R2^2/D10^2 : 1.48679E-02 (-0.0131654 0.0699083)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.44 using 59 PHA bins.
# Reduced chi-squared = 0.8444 for 55 degrees of freedom
# Null hypothesis probability = 7.875773e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.349e-07 1.234e-07
25- 50 6.637e-07 1.633e-07
50-150 4.043e-07 2.097e-07
15-150 1.603e-06 4.628e-07
Peak spectrum fit
Power-law model
Time interval is from 45.964 sec. to 46.964 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.16571 ( -0.461885 0.550273 )
Norm@50keV : 3.44396E-03 ( -0.00125861 0.00119853 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.80 using 59 PHA bins.
# Reduced chi-squared = 0.8210 for 57 degrees of freedom
# Null hypothesis probability = 8.304741e-01
Photon flux (15-150 keV) in 1 sec: 0.560077 ( -0.144129 0.144131 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.22325e-08 ( -9.91944e-09 1.04597e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 45.964 sec. to 46.964 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.45596 ( -2.20612 0.65 )
Epeak [keV] : 31.3932 ( )
Norm@50keV : 9.01582E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.29 using 59 PHA bins.
# Reduced chi-squared = 0.8266 for 56 degrees of freedom
# Null hypothesis probability = 8.192416e-01
Photon flux (15-150 keV) in 1 sec: 0.550668 ( -0.073332 0.143515 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.05602e-08 ( -9.7181e-09 1.11135e-08 ) ergs/cm2
Band function
Time interval is from 45.964 sec. to 46.964 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -7.91212 -5 )
beta : -2.32645 ( -0.821935 0.550604 )
Epeak [keV] : 21.1140 ( -21.1072 7.32755 )
Norm@50keV : 2048.45 ( -524.362 9.37731e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.25 using 59 PHA bins.
# Reduced chi-squared = 0.8409 for 55 degrees of freedom
# Null hypothesis probability = 7.935569e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.05789e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.57776 (-3.38263 4.23924)
R^2/D10^2 : 0.301771 (-0.225175 1.34799)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.77 using 59 PHA bins.
# Reduced chi-squared = 0.8906 for 57 degrees of freedom
# Null hypothesis probability = 7.065870e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.547e-09 3.313e-09
25- 50 1.296e-08 7.715e-09
50-150 5.961e-09 3.890e-09
15-150 2.447e-08 1.377e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 52.0531 (-25.451 73.2228)
Norm : 3.13313 (-1.12635 1.97558)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.32 using 59 PHA bins.
# Reduced chi-squared = 0.8126 for 57 degrees of freedom
# Null hypothesis probability = 8.430691e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.729e-09 2.965e-09
25- 50 1.126e-08 5.551e-09
50-150 1.135e-08 7.951e-09
15-150 3.034e-08 1.437e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.23611 (-1.96702 2.92273)
R1^2/D10^2 : 5.49334 (-4.82973 126.628)
kT2 [keV] : 15.5316 (-5.4757 11.6514)
R2^2/D10^2 : 3.60898E-02 (-0.0323142 0.17333)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.98 using 59 PHA bins.
# Reduced chi-squared = 0.8179 for 55 degrees of freedom
# Null hypothesis probability = 8.303469e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.363e-09 4.598e-09
25- 50 1.020e-08 5.205e-09
50-150 1.242e-08 8.385e-09
15-150 3.099e-08 1.655e-08
Plot creation:
Mon Sep 14 09:37:43 EDT 2015