batgrbproduct Analysis for Trigger=645340
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 Jun 22 11:10:36 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger645340/GCN5_download_cron
======================================================================
Trigger: 00645340 Segment: 000
BAT Trigger Time: 456578952 [s; MET]
Trigger Stop: 456579016 [s; MET]
UTC: 2015-06-21T11:28:58.251820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.071470122346 Dec: -15.6907688838552 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 17.7
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 17.7
Flight Position: [ source = BAT ]
RA: 245.071470122346 Dec: -15.6907688838552 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 244.987901198274 Dec: -15.637665157875 [deg; J2000]
{ 16h 19m 57.1s , -15d 38' 15.6" }
+/- 0.60240583324084 [arcmin] (estimated 90% radius based on SNR)
+/- 0.177237781993263 [arcmin] (formal 1-sigma fit error)
SNR: 62.742587478449
Angular difference between Flight and Ground position is 5.784528 arcmin
Partial Coding Fraction: 0.5546875 [ including projection effects ]
Duration
T90: 794.155999958515 +/- 15.4459067993292
Measured from: -147.431999862194
to: 646.724000096321 [s; relative to TRIGTIME]
T50: 466.77999997139 +/- 11.6670647739215
Measured from: -42.0119999051094
to: 424.76800006628 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 18.8600000143051
to: 19.8600000143051 [s; relative to TRIGTIME]
Total Fluence
Measured from: -179.836000025272
to: 784.175999999046 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 74.760229 6.329105 0.157038 0.041834
0.232832 0.187392 0.154563 0.131768 [error]
Peak 0.130269 0.018731 0.013222 0.008482
0.010007 0.007564 0.006281 0.005156 [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 2.89e-05 2.58e-06 9.10e-08 3.31e-09 3.15e-05 3.15e-05 erg/cm2
Error 1.94e-06 1.35e-07 1.42e-08 9.17e-10 1.92e-06 1.92e-06 erg/cm2
Peak flux Power-law 1.51e+00 1.85e-01 9.72e-03 5.37e-04 1.71e+00 1.71e+00 ph/cm2/s
Error 2.40e-01 7.53e-02 9.78e-03 1.09e-03 2.61e-01 2.61e-01 ph/cm2/s
Fluence Cutoff-PL 2.56e-05 2.34e-06 4.73e-09 1.89e-14 2.79e-05 2.79e-05 erg/cm2
Error 2.40e-06 1.50e-07 4.71e-09 3.30e-13 2.40e-06 2.40e-06 erg/cm2
Peak flux Cutoff-PL 1.51e+00 1.80e-01 9.06e-03 4.83e-04 1.70e+00 1.71e+00 ph/cm2/s
Error 2.40e-01 8.59e-02 1.15e-02 1.09e-03 2.61e-01 2.61e-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 6.827 0.167 - - 1.20e-04 1.52e-05 92.790 57
CPL 1.000 0.000 50.0 0.0 1.48e-03 0.00e+00 1494.790 56
The chi2 of BB fit is 57.91 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 5.248 0.793 - - 8.72e-04 7.06e-04 39.690 57
CPL 1.000 0.000 50.0 0.0 1.70e-02 0.00e+00 113.380 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 964.012 -179.836 784.176
T90 794.156 -147.432 646.724
T50 466.780 -42.012 424.768
Peak 1.000 18.860 19.860
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
244.9879 -15.6377 0.0031 26.6 42.8 18.6649 62.7 TRIG_00645340
------------------------------------------
Foreground time interval of the image:
-82.599 73.801 (delta_t = 156.400 [sec])
Background time interval of the image:
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
-179.836000 118.790000
120.000000 126.130000
128.000000 263.620000
270.000000 270.810000
272.000000 274.310000
275.000000 275.177800
276.000000 277.300000
278.000000 279.135300
280.000000 784.176000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.82709 ( -0.168469 0.166256 )
Norm@50keV : 1.19657E-04 ( -1.43616e-05 1.59619e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 92.79 using 59 PHA bins.
# Reduced chi-squared = 1.628 for 57 degrees of freedom
# Null hypothesis probability = 1.923665e-03
Photon flux (15-150 keV) in 950.3 sec: 1.14385 ( -0.0744175 0.0756603 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.15309e-05 ( -1.90745e-06 1.93652e-06 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-179.836000 118.790000
120.000000 126.130000
128.000000 263.620000
270.000000 270.810000
272.000000 274.310000
275.000000 275.177800
276.000000 277.300000
278.000000 279.135300
280.000000 784.176000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.47779E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 1494.79 using 59 PHA bins.
# Reduced chi-squared = 26.6926 for 56 degrees of freedom
# Null hypothesis probability = 9.466683e-276
Photon flux (15-150 keV) in 950.3 sec: 0.997176 ( -0.094883 0.093724 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.79279e-05 ( -2.41842e-06 2.38715e-06 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-179.836000 118.790000
120.000000 126.130000
128.000000 263.620000
270.000000 270.810000
272.000000 274.310000
275.000000 275.177800
276.000000 277.300000
278.000000 279.135300
280.000000 784.176000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.286773 ( -2.50269 1.97131 )
beta : -8.46398 ( 8.45725 0.724683 )
Epeak [keV] : 7.46128 ( -1.99099 2.92851 )
Norm@50keV : 39.9125 ( -39.8437 48858.2 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.90 using 59 PHA bins.
# Reduced chi-squared = 0.9255 for 55 degrees of freedom
# Null hypothesis probability = 6.319492e-01
Photon flux (15-150 keV) in 950.3 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] : 2.67647 (-0.0817205 0.0870487)
R^2/D10^2 : 279.052 (-71.3698 94.1879)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.91 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 57 degrees of freedom
# Null hypothesis probability = 4.413853e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.354e-05 2.143e-06
25- 50 2.262e-06 1.544e-07
50-150 1.363e-09 3.939e-10
15-150 2.580e-05 2.005e-06
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.35779 (-0.18058 0.196537)
Norm : 396.210 (-85.7804 107.538)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.95 using 59 PHA bins.
# Reduced chi-squared = 0.9289 for 57 degrees of freedom
# Null hypothesis probability = 6.277246e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.594e-05 2.219e-06
25- 50 2.361e-06 1.520e-07
50-150 5.830e-09 1.556e-09
15-150 2.831e-05 2.048e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.01066 (-3.55464 8.50355)
R1^2/D10^2 : 0.411568 (-0.383949 10.2074)
kT2 [keV] : 2.48466 (-1.01028 0.182028)
R2^2/D10^2 : 487.887 (-205.796 12053)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.49 using 59 PHA bins.
# Reduced chi-squared = 0.9362 for 55 degrees of freedom
# Null hypothesis probability = 6.094486e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.528e-05 5.778e-06
25- 50 2.373e-06 8.069e-07
50-150 2.639e-08 1.602e-08
15-150 2.768e-05 7.222e-06
Peak spectrum fit
Power-law model
Time interval is from 18.860 sec. to 19.860 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 5.24846 ( -0.744267 0.841621 )
Norm@50keV : 8.71713E-04 ( -0.000509938 0.000902448 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.69 using 59 PHA bins.
# Reduced chi-squared = 0.6964 for 57 degrees of freedom
# Null hypothesis probability = 9.606016e-01
Photon flux (15-150 keV) in 1 sec: 1.70811 ( -0.261327 0.261337 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.36545e-08 ( -8.84154e-09 9.02011e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 18.860 sec. to 19.860 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.70025E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 113.38 using 59 PHA bins.
# Reduced chi-squared = 2.0246 for 56 degrees of freedom
# Null hypothesis probability = 9.056443e-06
Photon flux (15-150 keV) in 1 sec: 1.70499 ( -0.26024 0.26093 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.35278e-08 ( -8.7509e-09 9.0191e-09 ) ergs/cm2
Band function
Time interval is from 18.860 sec. to 19.860 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.67898 ( 9.67898 9.67898 )
beta : -5.29258 ( -0.805755 0.783141 )
Epeak [keV] : 2.38420 ( -2.3842 -2.3842 )
Norm@50keV : 0.113239 ( -0.0656326 0.126527 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.70 using 59 PHA bins.
# Reduced chi-squared = 0.7219 for 55 degrees of freedom
# Null hypothesis probability = 9.401276e-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] : 2.67000 (-0.392269 0.476715)
R^2/D10^2 : 521.389 (-521.418 1167.67)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.28 using 59 PHA bins.
# Reduced chi-squared = 0.7418 for 57 degrees of freedom
# Null hypothesis probability = 9.271912e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.552e-08 2.473e-08
25- 50 4.334e-09 2.620e-09
50-150 2.554e-12 2.957e-12
15-150 4.986e-08 2.205e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.13842 (-1.12772 1.60332)
Norm : 353.608 (-208.813 576.992)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.99 using 59 PHA bins.
# Reduced chi-squared = 0.7192 for 57 degrees of freedom
# Null hypothesis probability = 9.456702e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.488e-08 1.715e-08
25- 50 6.029e-09 3.166e-09
50-150 3.581e-11 3.472e-11
15-150 5.094e-08 2.392e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.60063 (-0.425769 0.481236)
R1^2/D10^2 : 618.865 (-428.857 2241.88)
kT2 [keV] : 36.1308 (-29.8366 -35.0816)
R2^2/D10^2 : 1.84048E-03 (-0.00200128 0.092611)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.11 using 59 PHA bins.
# Reduced chi-squared = 0.6748 for 55 degrees of freedom
# Null hypothesis probability = 9.693006e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.534e-08 2.479e-08
25- 50 6.070e-09 2.932e-09
50-150 1.843e-08 1.380e-08
15-150 6.984e-08 3.144e-08
Plot creation:
Mon Jun 22 11:15:35 EDT 2015