batgrbproduct Analysis for Trigger=656604
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): Sat Sep 26 04:24:53 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger656604/GCN5_download_cron
======================================================================
Trigger: 00656604 Segment: 000
BAT Trigger Time: 464846984 [s; MET]
Trigger Stop: 464847048 [s; MET]
UTC: 2015-09-25T04:09:28.817940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 227.519805836203 Dec: -19.6283015106395 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.64
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 12.64
Flight Position: [ source = BAT ]
RA: 227.519805836203 Dec: -19.6283015106395 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 227.537514363029 Dec: -19.6395203151358 [deg; J2000]
{ 15h 10m 09.0s , -19d 38' 22.3" }
+/- 1.98891730865041 [arcmin] (estimated 90% radius based on SNR)
+/- 0.830642460709249 [arcmin] (formal 1-sigma fit error)
SNR: 11.3899824616361
Angular difference between Flight and Ground position is 1.206057 arcmin
Partial Coding Fraction: 0.5625 [ including projection effects ]
Duration
T90: 121.447999954224 +/- 27.0322042872599
Measured from: 10.3480001091957
to: 131.796000063419 [s; relative to TRIGTIME]
T50: 41.0959998965263 +/- 26.6313271336868
Measured from: 23.3960001468658
to: 64.4920000433922 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 30.6840000152588
to: 31.6840000152588 [s; relative to TRIGTIME]
Total Fluence
Measured from: 3.50800001621246
to: 149.611999988556 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.060082 1.020993 0.469134 0.060048
0.097157 0.091596 0.075331 0.062965 [error]
Peak 0.023001 0.025290 0.021529 0.007658
0.009151 0.008667 0.007112 0.006052 [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 3.65e-07 4.40e-07 3.85e-07 5.77e-07 1.39e-06 1.77e-06 erg/cm2
Error 5.27e-08 4.61e-08 7.27e-08 2.13e-07 1.68e-07 2.99e-07 erg/cm2
Peak flux Power-law 2.08e-01 2.08e-01 1.46e-01 1.62e-01 6.25e-01 7.23e-01 ph/cm2/s
Error 1.26e-01 7.81e-02 5.99e-02 1.44e-01 2.20e-01 2.41e-01 ph/cm2/s
Fluence Cutoff-PL 3.50e-07 4.68e-07 3.72e-07 2.36e-07 1.33e-06 1.43e-06 erg/cm2
Error 5.79e-08 6.19e-08 8.41e-08 3.98e-07 1.91e-07 4.18e-07 erg/cm2
Peak flux Cutoff-PL 1.92e-01 2.12e-01 1.51e-01 1.16e-01 6.14e-01 6.72e-01 ph/cm2/s
Error 1.71e-01 8.54e-02 7.19e-02 1.27e-01 2.42e-01 2.98e-01 ph/cm2/s
Fluence Band 3.46e-07 4.69e-07 3.62e-07 3.80e-07 1.34e-06 1.56e-06 erg/cm2
Error -------- -------- 8.70e-08 -------- -------- -------- 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 2.194 0.203 - - 1.01e-03 1.39e-04 69.670 57
CPL 1.682 0.634 25.2 0.0 2.03e-03 0.00e+00 68.440 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.511 0.629 - - 4.99e-03 1.68e-03 53.550 57
CPL 1.169 3.513 131.6 0.0 7.24e-03 8.01e-01 53.500 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: 27.968000 sec.
T50 in the 50-300 keV band: 11.776000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 146.104 3.508 149.612
T90 121.448 10.348 131.796
T50 41.096 23.396 64.492
Peak 1.000 30.684 31.684
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
227.5375 -19.6395 0.0169 35.5 -37.9 1.9887 11.4 TRIG_00656604
------------------------------------------
Foreground time interval of the image:
3.508 72.001 (delta_t = 68.493 [sec])
Background time interval of the image:
-75.299 3.508 (delta_t = 78.807 [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 3.508 sec. to 149.612 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.19370 ( -0.196478 0.208873 )
Norm@50keV : 1.01473E-03 ( -0.000140737 0.000137501 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.67 using 59 PHA bins.
# Reduced chi-squared = 1.222 for 57 degrees of freedom
# Null hypothesis probability = 1.209357e-01
Photon flux (15-150 keV) in 146.1 sec: 0.167438 ( -0.0174029 0.0174164 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.39266e-06 ( -1.66199e-07 1.69231e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.508 sec. to 149.612 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68217 ( -0.950971 0.317375 )
Epeak [keV] : 25.1912 ( )
Norm@50keV : 2.02734E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.44 using 59 PHA bins.
# Reduced chi-squared = 1.222 for 56 degrees of freedom
# Null hypothesis probability = 1.229919e-01
Photon flux (15-150 keV) in 146.1 sec: 0.164171 ( -0.017795 0.018075 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3263e-06 ( -1.86933e-07 1.95756e-07 ) ergs/cm2
Band function
Time interval is from 3.508 sec. to 149.612 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.113783 ( -0.0979464 -0.0979464 )
beta : -2.37636 ( 2.37591 0.31169 )
Epeak [keV] : 25.2068 ( -25.2254 16.3478 )
Norm@50keV : 4.46922E-02 ( -0.0404917 186.29 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.05 using 59 PHA bins.
# Reduced chi-squared = 1.237 for 55 degrees of freedom
# Null hypothesis probability = 1.112659e-01
Photon flux (15-150 keV) in 146.1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.33563e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.94418 (-1.09495 1.24024)
R^2/D10^2 : 0.115566 (-0.0466896 0.0796256)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.84 using 59 PHA bins.
# Reduced chi-squared = 1.541 for 57 degrees of freedom
# Null hypothesis probability = 5.416739e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.621e-07 4.785e-08
25- 50 5.517e-07 7.670e-08
50-150 2.065e-07 6.395e-08
15-150 1.020e-06 1.407e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 49.7668 (-12.2413 18.7973)
Norm : 0.944832 (-0.164495 0.215064)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.87 using 59 PHA bins.
# Reduced chi-squared = 1.208 for 57 degrees of freedom
# Null hypothesis probability = 1.346585e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.372e-07 4.756e-08
25- 50 4.834e-07 6.100e-08
50-150 4.673e-07 1.354e-07
15-150 1.288e-06 1.728e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.17646 (-1.3889 1.62653)
R1^2/D10^2 : 0.733502 (-0.234689 1.86292)
kT2 [keV] : 16.7130 (-4.42486 9.59886)
R2^2/D10^2 : 6.65584E-03 (-0.00562067 0.0189061)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.04 using 59 PHA bins.
# Reduced chi-squared = 1.237 for 55 degrees of freedom
# Null hypothesis probability = 1.113590e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.544e-07 1.734e-07
25- 50 4.549e-07 2.016e-07
50-150 4.912e-07 2.821e-07
15-150 1.300e-06 6.003e-07
Peak spectrum fit
Power-law model
Time interval is from 30.684 sec. to 31.684 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51072 ( -0.623227 0.634099 )
Norm@50keV : 4.99374E-03 ( -0.00169375 0.00167367 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.55 using 59 PHA bins.
# Reduced chi-squared = 0.9395 for 57 degrees of freedom
# Null hypothesis probability = 6.051669e-01
Photon flux (15-150 keV) in 1 sec: 0.625227 ( -0.218287 0.220888 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.72913e-08 ( -1.68873e-08 1.71931e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 30.684 sec. to 31.684 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16878 ( -5.72174 1.30364 )
Epeak [keV] : 131.637 ( -131.628 -131.628 )
Norm@50keV : 7.23882E-03 ( -0.00397821 1.59761 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.50 using 59 PHA bins.
# Reduced chi-squared = 0.9554 for 56 degrees of freedom
# Null hypothesis probability = 5.699215e-01
Photon flux (15-150 keV) in 1 sec: 0.613793 ( -0.254618 0.228555 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.64974e-08 ( -9.1778e-09 1.782e-08 ) ergs/cm2
Band function
Time interval is from 30.684 sec. to 31.684 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.913081 ( 0.913432 0.913432 )
beta : -2.03443 ( 1.9843 9.7809 )
Epeak [keV] : 97.1816 ( -101.18 -101.18 )
Norm@50keV : 9.55974E-03 ( -0.00526428 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.51 using 59 PHA bins.
# Reduced chi-squared = 0.9730 for 55 degrees of freedom
# Null hypothesis probability = 5.315530e-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] : 16.8201 (-5.15694 8.85441)
R^2/D10^2 : 4.78258E-02 (-0.0478258 0.126929)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.64 using 59 PHA bins.
# Reduced chi-squared = 0.9586 for 57 degrees of freedom
# Null hypothesis probability = 5.640828e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.764e-09 1.785e-09
25- 50 1.212e-08 7.425e-09
50-150 2.440e-08 1.633e-08
15-150 3.929e-08 2.526e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-199.363 -199.363)
Norm : 2.56663 (-0.853844 1.14927)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.56 using 59 PHA bins.
# Reduced chi-squared = 0.9396 for 57 degrees of freedom
# Null hypothesis probability = 6.050176e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.391e-09 4.032e-09
25- 50 1.229e-08 7.475e-09
50-150 2.696e-08 1.627e-08
15-150 4.565e-08 2.764e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.80054 (-2.8076 37.3183)
R1^2/D10^2 : 41.5658 (-41.3032 412.202)
kT2 [keV] : 19.1661 (-6.20499 14.3349)
R2^2/D10^2 : 2.83454E-02 (-0.0283211 0.0328629)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.97 using 59 PHA bins.
# Reduced chi-squared = 0.9449 for 55 degrees of freedom
# Null hypothesis probability = 5.910826e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.044e-09 4.101e-09
25- 50 1.044e-08 6.080e-09
50-150 2.670e-08 1.746e-08
15-150 4.419e-08 2.302e-08
Plot creation:
Sat Sep 26 04:31:59 EDT 2015