batgrbproduct Analysis for Trigger=637044
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 Apr 4 20:48:41 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger637044/GCN5_download_cron
======================================================================
Trigger: 00637044 Segment: 000
BAT Trigger Time: 449790870.208 [s; MET]
Trigger Stop: 449790871.232 [s; MET]
UTC: 2015-04-03T21:54:16.809780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 311.504549158767 Dec: -62.7015671965277 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 21.08
Image Trigger?: NO
Rate S/N Ratio: 77.9037868142493 [ if not an image trigger ]
Image S/N Ratio: 21.08
Flight Position: [ source = BAT ]
RA: 311.504549158767 Dec: -62.7015671965277 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 311.504263843077 Dec: -62.7059769894068 [deg; J2000]
{ 20h 46m 01.0s , -62d 42' 21.5" }
+/- 0.71716017797945 [arcmin] (estimated 90% radius based on SNR)
+/- 0.193138139120979 [arcmin] (formal 1-sigma fit error)
SNR: 48.9081234241698
Angular difference between Flight and Ground position is 0.264704 arcmin
Partial Coding Fraction: 0.4023438 [ including projection effects ]
Duration
T90: 38.7719999551773 +/- 12.0135891154935
Measured from: -5.47599989175797
to: 33.2960000634193 [s; relative to TRIGTIME]
T50: 8.91999989748001 +/- 0.51482032591538
Measured from: 2.27600014209747
to: 11.1960000395775 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 5.80400002002716
to: 6.80400002002716 [s; relative to TRIGTIME]
Total Fluence
Measured from: -83.6520000100136
to: 145.371999979019 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 5.158168 8.336276 8.147355 2.643905
0.133468 0.137045 0.123314 0.102737 [error]
Peak 0.348014 0.707447 0.844866 0.317534
0.017466 0.022496 0.024436 0.019396 [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 1.68e-06 3.65e-06 6.24e-06 2.46e-05 1.71e-05 3.62e-05 erg/cm2
Error 7.65e-08 9.67e-08 1.34e-07 1.28e-06 3.46e-07 1.31e-06 erg/cm2
Peak flux Power-law 3.62e+00 5.16e+00 5.46e+00 1.07e+01 1.76e+01 2.49e+01 ph/cm2/s
Error 2.60e-01 2.23e-01 1.97e-01 8.53e-01 6.02e-01 9.58e-01 ph/cm2/s
Fluence Cutoff-PL 1.62e-06 3.66e-06 6.32e-06 2.14e-05 1.70e-05 3.30e-05 erg/cm2
Error 7.86e-08 9.87e-08 1.65e-07 3.56e-06 3.65e-07 4.35e-06 erg/cm2
Peak flux Cutoff-PL 3.44e+00 5.20e+00 5.59e+00 8.96e+00 1.75e+01 2.32e+01 ph/cm2/s
Error 3.35e-01 2.33e-01 2.50e-01 1.97e+00 6.19e-01 2.46e+00 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 1.227 0.038 - - 7.42e-03 1.52e-04 39.570 57
CPL 1.109 0.142 463.6 0.0 8.29e-03 9.50e-04 37.780 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.917 0.060 - - 1.53e-01 5.21e-03 51.260 57
CPL 0.741 0.189 424.7 0.0 1.83e-01 3.91e-02 49.500 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: 27.264000 sec.
T50 in the 50-300 keV band: 6.976000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 229.024 -83.652 145.372
T90 38.772 -5.476 33.296
T50 8.920 2.276 11.196
Peak 1.000 5.804 6.804
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
311.5043 -62.7060 0.0039 33.0 -65.4 16.6681 48.9 TRIG_00637044
------------------------------------------
Foreground time interval of the image:
-83.652 9.593 (delta_t = 93.245 [sec])
Background time interval of the image:
-239.208 -83.652 (delta_t = 155.556 [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 -83.652 sec. to 145.372 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22677 ( -0.0380186 0.0378506 )
Norm@50keV : 7.42098E-03 ( -0.000152451 0.000152071 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.57 using 59 PHA bins.
# Reduced chi-squared = 0.6942 for 57 degrees of freedom
# Null hypothesis probability = 9.618674e-01
Photon flux (15-150 keV) in 229 sec: 0.874496 ( -0.0199136 0.0199762 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.71137e-05 ( -3.4598e-07 3.46133e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -83.652 sec. to 145.372 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10944 ( -0.154153 0.13027 )
Epeak [keV] : 463.558 ( -463.559 -463.559 )
Norm@50keV : 8.29452E-03 ( -0.000632486 0.00126791 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.78 using 59 PHA bins.
# Reduced chi-squared = 0.6747 for 56 degrees of freedom
# Null hypothesis probability = 9.705529e-01
Photon flux (15-150 keV) in 229 sec: 0.866708 ( -0.021984 0.022053 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.7034e-05 ( -3.65438e-07 3.64087e-07 ) ergs/cm2
Band function
Time interval is from -83.652 sec. to 145.372 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.770483 ( 0.771183 0.771183 )
beta : -1.25586 ( 1.2559 0.0537336 )
Epeak [keV] : 101.889 ( -102.312 8974.98 )
Norm@50keV : 1.35792E-02 ( -0.00587715 375.531 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.74 using 59 PHA bins.
# Reduced chi-squared = 0.6861 for 55 degrees of freedom
# Null hypothesis probability = 9.635477e-01
Photon flux (15-150 keV) in 229 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] : 21.4319 ( )
R^2/D10^2 : 3.10119E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 477.03 using 59 PHA bins.
# Reduced chi-squared = 8.3689 for 57 degrees of freedom
# Null hypothesis probability = 1.230974e-67
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.108e-07 2.565e-08
25- 50 3.180e-06 9.732e-08
50-150 1.090e-05 3.481e-07
15-150 1.469e-05 3.206e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 3.81158 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 302.11 using 59 PHA bins.
# Reduced chi-squared = 5.3003 for 57 degrees of freedom
# Null hypothesis probability = 4.476755e-35
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.173e-06 4.775e-08
25- 50 4.181e-06 9.275e-08
50-150 9.170e-06 2.290e-07
15-150 1.552e-05 3.538e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.40649 (-0.729303 0.789188)
R1^2/D10^2 : 0.398115 (-0.0993936 0.141488)
kT2 [keV] : 33.7760 (-2.48662 3.1747)
R2^2/D10^2 : 5.97486E-03 (-0.00152871 0.00175958)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.08 using 59 PHA bins.
# Reduced chi-squared = 0.8015 for 55 degrees of freedom
# Null hypothesis probability = 8.541140e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.432e-06 1.107e-07
25- 50 3.757e-06 1.706e-07
50-150 1.185e-05 4.878e-07
15-150 1.704e-05 6.801e-07
Peak spectrum fit
Power-law model
Time interval is from 5.804 sec. to 6.804 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.917268 ( -0.0600785 0.0596147 )
Norm@50keV : 0.153183 ( -0.00521834 0.00520529 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.26 using 59 PHA bins.
# Reduced chi-squared = 0.8993 for 57 degrees of freedom
# Null hypothesis probability = 6.892159e-01
Photon flux (15-150 keV) in 1 sec: 17.5857 ( -0.601548 0.601889 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70773e-06 ( -6.27885e-08 6.29095e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 5.804 sec. to 6.804 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.741451 ( -0.237779 0.140361 )
Epeak [keV] : 424.691 ( -424.691 -424.691 )
Norm@50keV : 0.182527 ( -0.0310818 0.0470949 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.50 using 59 PHA bins.
# Reduced chi-squared = 0.8840 for 56 degrees of freedom
# Null hypothesis probability = 7.175916e-01
Photon flux (15-150 keV) in 1 sec: 17.4672 ( -0.6193 0.6194 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69707e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 5.804 sec. to 6.804 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99996 ( -0.000122492 -4.99996 )
beta : -0.962194 ( -0.0657477 0.0654902 )
Epeak [keV] : 28.6208 ( -6.2177 3.6651 )
Norm@50keV : 4391.03 ( -145.907 13645.8 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.34 using 59 PHA bins.
# Reduced chi-squared = 0.8606 for 55 degrees of freedom
# Null hypothesis probability = 7.591065e-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] : 23.6864 ( )
R^2/D10^2 : 0.511640 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 186.22 using 59 PHA bins.
# Reduced chi-squared = 3.2669 for 57 degrees of freedom
# Null hypothesis probability = 1.263576e-15
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.127e-08 3.685e-09
25- 50 2.827e-07 1.470e-08
50-150 1.183e-06 6.150e-08
15-150 1.517e-06 6.350e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 69.9872 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 346.60 using 59 PHA bins.
# Reduced chi-squared = 6.0806 for 57 degrees of freedom
# Null hypothesis probability = 4.172875e-43
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.743e-07 6.250e-09
25- 50 3.352e-07 1.310e-08
50-150 7.352e-07 2.890e-08
15-150 1.245e-06 4.200e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.81854 (-1.26229 1.4879)
R1^2/D10^2 : 5.57283 (-1.98651 3.33834)
kT2 [keV] : 38.1400 (-4.63224 7.18094)
R2^2/D10^2 : 0.105641 (-0.0421832 0.0519517)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.67 using 59 PHA bins.
# Reduced chi-squared = 0.8486 for 55 degrees of freedom
# Null hypothesis probability = 7.804745e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.040e-07 1.562e-08
25- 50 3.097e-07 2.940e-08
50-150 1.303e-06 1.325e-07
15-150 1.717e-06 1.625e-07
Plot creation:
Sat Apr 4 20:52:37 EDT 2015