batgrbproduct Analysis for Trigger=640584
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 May 14 12:19:13 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger640584/batgroup_hand_proc
======================================================================
Trigger: 00640584 Segment: 000
BAT Trigger Time: 453241893.312 [s; MET]
Trigger Stop: 453241895.36 [s; MET]
UTC: 2015-05-13T20:31:19.736540 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 49.0579234177396 Dec: -22.9128777277239 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.43
Image Trigger?: NO
Rate S/N Ratio: 14.247806848775 [ if not an image trigger ]
Image S/N Ratio: 7.43
Flight Position: [ source = BAT ]
RA: 49.0579234177396 Dec: -22.9128777277239 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 49.0440736765469 Dec: -22.8675796361554 [deg; J2000]
{ 03h 16m 10.6s , -22d 52' 03.3" }
+/- 0.944550866385861 [arcmin] (estimated 90% radius based on SNR)
+/- 0.350068154364022 [arcmin] (formal 1-sigma fit error)
SNR: 32.9997565616832
Angular difference between Flight and Ground position is 2.823643 arcmin
Partial Coding Fraction: 0.640625 [ including projection effects ]
Duration
T90: 161.627999961376 +/- 4.88357406102109
Measured from: -42.5479999780655
to: 119.079999983311 [s; relative to TRIGTIME]
T50: 92.1399999856949 +/- 4.80028163093598
Measured from: -21.027999997139
to: 71.1119999885559 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 115.412000000477
to: 116.412000000477 [s; relative to TRIGTIME]
Total Fluence
Measured from: -54.3319999575615
to: 129.360000014305 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.875990 2.884776 2.479810 0.670681
0.103327 0.104427 0.092036 0.076763 [error]
Peak 0.090330 0.122027 0.107183 0.022613
0.009309 0.009994 0.009204 0.006710 [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 6.49e-07 1.27e-06 1.92e-06 6.31e-06 5.39e-06 1.01e-05 erg/cm2
Error 5.11e-08 5.88e-08 9.24e-08 6.88e-07 2.30e-07 7.38e-07 erg/cm2
Peak flux Power-law 9.37e-01 9.63e-01 6.97e-01 8.09e-01 2.91e+00 3.41e+00 ph/cm2/s
Error 1.44e-01 9.07e-02 7.55e-02 1.81e-01 2.58e-01 2.98e-01 ph/cm2/s
Fluence Cutoff-PL 6.17e-07 1.29e-06 1.96e-06 4.65e-06 5.32e-06 8.51e-06 erg/cm2
Error 6.36e-08 6.48e-08 1.05e-07 1.23e-06 2.46e-07 1.40e-06 erg/cm2
Peak flux Cutoff-PL 9.08e-01 9.76e-01 7.09e-01 6.78e-01 2.89e+00 3.27e+00 ph/cm2/s
Error 1.72e-01 1.03e-01 8.68e-02 3.10e-01 2.66e-01 4.19e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 9.05e-01 9.77e-01 7.10e-01 6.70e-01 2.89e+00 3.27e+00 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 1.401 0.073 - - 3.04e-03 1.22e-04 76.820 57
CPL 1.174 0.273 199.2 -58.7 3.87e-03 1.12e-03 74.800 56
The chi2 of BB fit is Chi-Squared Chi-Squared 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 1.466 0.151 - - 2.35e-02 2.06e-03 68.350 57
CPL 1.307 0.463 230.3 0.0 2.81e-02 1.80e-02 68.130 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: 163.072000 sec.
T50 in the 50-300 keV band: 74.112000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 183.692 -54.332 129.360
T90 161.628 -42.548 119.080
T50 92.140 -21.028 71.112
Peak 1.000 115.412 116.412
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
49.0441 -22.8676 0.0058 35.2233 -28.5426 8.7191534 33.000 TRIG_00640584
Foreground time interval of the image:
-54.332 129.360 (delta_t = 183.692 [sec])
Background time interval of the image:
-239.312 -54.332 (delta_t = 184.980 [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 -54.332 sec. to 129.360 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40130 ( -0.0726493 0.072422 )
Norm@50keV : 3.03674E-03 ( -0.000121501 0.000121501 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.82 using 59 PHA bins.
# Reduced chi-squared = 1.348 for 57 degrees of freedom
# Null hypothesis probability = 4.118267e-02
Photon flux (15-150 keV) in 183.7 sec: 0.369927 ( -0.0159919 0.0160333 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.38888e-06 ( -2.29544e-07 2.29983e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -54.332 sec. to 129.360 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17374 ( -0.2907 0.254468 )
Epeak [keV] : 199.182 ( -81.7365 -199.182 )
Norm@50keV : 3.87169E-03 ( -0.000885482 0.00135759 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.80 using 59 PHA bins.
# Reduced chi-squared = 1.336 for 56 degrees of freedom
# Null hypothesis probability = 4.736729e-02
Photon flux (15-150 keV) in 183.7 sec: 0.364984 ( -0.016978 0.017012 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.32012e-06 ( -2.46581e-07 2.45644e-07 ) ergs/cm2
Band function
Time interval is from -54.332 sec. to 129.360 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.880501 ( -0.879389 -0.879389 )
beta : -1.44347 ( 1.44347 0.0908074 )
Epeak [keV] : 33.1880 ( -33.2062 121.536 )
Norm@50keV : 0.134195 ( -0.133137 118.609 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.66 using 59 PHA bins.
# Reduced chi-squared = 1.357 for 55 degrees of freedom
# Null hypothesis probability = 4.001101e-02
Photon flux (15-150 keV) in 183.7 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] : 17.7630 ( )
R^2/D10^2 : 2.34990E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 205.69 using 59 PHA bins.
# Reduced chi-squared = 3.6086 for 57 degrees of freedom
# Null hypothesis probability = 1.107191e-18
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.738e-07 2.342e-08
25- 50 1.254e-06 7.798e-08
50-150 2.862e-06 1.947e-07
15-150 4.390e-06 1.993e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.54530 (-0.0621058 0.0620912)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 90.78 using 59 PHA bins.
# Reduced chi-squared = 1.593 for 57 degrees of freedom
# Null hypothesis probability = 2.952798e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.068e-07 2.994e-08
25- 50 1.360e-06 5.906e-08
50-150 2.982e-06 1.442e-07
15-150 5.049e-06 2.305e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.22436 (-0.97315 1.09975)
R1^2/D10^2 : 0.315800 (-0.119859 0.212782)
kT2 [keV] : 28.3893 (-3.22737 4.52118)
R2^2/D10^2 : 3.93434E-03 (-0.00157153 0.00212326)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.14 using 59 PHA bins.
# Reduced chi-squared = 1.312 for 55 degrees of freedom
# Null hypothesis probability = 6.033792e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.962e-07 9.084e-08
25- 50 1.298e-06 1.276e-07
50-150 3.431e-06 4.106e-07
15-150 5.325e-06 5.897e-07
Peak spectrum fit
Power-law model
Time interval is from 115.412 sec. to 116.412 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46566 ( -0.150008 0.15152 )
Norm@50keV : 2.35376E-02 ( -0.00206579 0.00205892 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.35 using 59 PHA bins.
# Reduced chi-squared = 1.199 for 57 degrees of freedom
# Null hypothesis probability = 1.443797e-01
Photon flux (15-150 keV) in 1 sec: 2.91212 ( -0.258079 0.258588 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.24601e-07 ( -2.15604e-08 2.16807e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 115.412 sec. to 116.412 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30688 ( -0.631829 0.295006 )
Epeak [keV] : 230.265 ( -230.24 -230.24 )
Norm@50keV : 2.81378E-02 ( -0.00819118 0.0278157 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.13 using 59 PHA bins.
# Reduced chi-squared = 1.217 for 56 degrees of freedom
# Null hypothesis probability = 1.283573e-01
Photon flux (15-150 keV) in 1 sec: 2.89312 ( -0.2671 0.26575 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.22834e-07 ( -2.2773e-08 2.2605e-08 ) ergs/cm2
Band function
Time interval is from 115.412 sec. to 116.412 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.32421 ( -0.19646 0.287176 )
beta : -9.17842 ( 9.36208 19.3621 )
Epeak [keV] : 255.527 ( -135.852 -254.147 )
Norm@50keV : 2.75924E-02 ( -0.00237489 0.0222779 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.13 using 59 PHA bins.
# Reduced chi-squared = 1.239 for 55 degrees of freedom
# Null hypothesis probability = 1.099614e-01
Photon flux (15-150 keV) in 1 sec: 2.89174 ( ) 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] : 16.4536 (-1.71618 1.94295)
R^2/D10^2 : 0.243506 (-0.0784071 0.11357)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 100.24 using 59 PHA bins.
# Reduced chi-squared = 1.7586 for 57 degrees of freedom
# Null hypothesis probability = 3.554045e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.354e-08 2.325e-09
25- 50 5.834e-08 7.650e-09
50-150 1.115e-07 1.776e-08
15-150 1.834e-07 1.950e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 11.9318 (-1.03436 1.03436)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.65 using 59 PHA bins.
# Reduced chi-squared = 1.222 for 57 degrees of freedom
# Null hypothesis probability = 1.213787e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.985e-08 3.305e-09
25- 50 5.743e-08 9.935e-09
50-150 1.260e-07 4.888e-08
15-150 2.132e-07 5.775e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.02285 (-1.65971 2.57795)
R1^2/D10^2 : 9.30081 (-7.15407 26.1565)
kT2 [keV] : 22.5083 (-3.74356 7.13216)
R2^2/D10^2 : 7.17273E-02 (-0.045472 0.0677735)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.10 using 59 PHA bins.
# Reduced chi-squared = 1.256 for 55 degrees of freedom
# Null hypothesis probability = 9.563396e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.969e-08 1.417e-08
25- 50 5.087e-08 1.501e-08
50-150 1.356e-07 3.642e-08
15-150 2.162e-07 5.575e-08
Plot creation:
Thu May 14 13:47:25 EDT 2015