batgrbproduct Analysis for Trigger=637899
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): Tue Apr 14 08:12:38 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger637899/batgroup_hand_proc
======================================================================
Trigger: 00637899 Segment: 000
BAT Trigger Time: 450626112 [s; MET]
Trigger Stop: 450626176 [s; MET]
UTC: 2015-04-13T13:54:58.559120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 190.38502276655 Dec: 71.8238536834753 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.29
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.29
Flight Position: [ source = BAT ]
RA: 190.38502276655 Dec: 71.8238536834753 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 190.396136857211 Dec: 71.8394097100175 [deg; J2000]
{ 12h 41m 35.1s , +71d 50' 21.9" }
+/- 1.91494472399966 [arcmin] (estimated 90% radius based on SNR)
+/- 0.835237532341171 [arcmin] (formal 1-sigma fit error)
SNR: 12.0236972884897
Angular difference between Flight and Ground position is 0.956242 arcmin
Partial Coding Fraction: 0.3554688 [ including projection effects ]
Duration
T90: 263.615999996662 +/- 36.7090501962671
Measured from: -75.7519999742508
to: 187.864000022411 [s; relative to TRIGTIME]
T50: 116.480000019073 +/- 16.0070484231669
Measured from: -4.43999999761581
to: 112.040000021458 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 110.77999997139
to: 111.77999997139 [s; relative to TRIGTIME]
Total Fluence
Measured from: -92.9840000271797
to: 209.832000017166 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.070014 2.666313 1.880239 0.331043
0.180083 0.177945 0.151610 0.127425 [error]
Peak 0.038864 0.075968 0.060956 0.008451
0.011225 0.011777 0.010115 0.008210 [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 7.47e-07 1.18e-06 1.41e-06 3.27e-06 4.28e-06 6.60e-06 erg/cm2
Error 9.33e-08 9.09e-08 1.53e-07 7.47e-07 3.60e-07 8.76e-07 erg/cm2
Peak flux Power-law 5.91e-01 5.52e-01 3.58e-01 3.58e-01 1.65e+00 1.86e+00 ph/cm2/s
Error 1.60e-01 9.97e-02 8.00e-02 1.54e-01 2.92e-01 3.26e-01 ph/cm2/s
Fluence Cutoff-PL 7.22e-07 1.21e-06 1.43e-06 2.34e-06 4.22e-06 5.69e-06 erg/cm2
Error 1.09e-07 1.10e-07 1.61e-07 -------- 3.92e-07 1.50e-06 erg/cm2
Peak flux Cutoff-PL 3.99e-01 6.64e-01 4.06e-01 6.50e-02 1.53e+00 1.53e+00 ph/cm2/s
Error 1.89e-01 1.33e-01 1.03e-01 9.71e-02 3.05e-01 3.15e-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 1.746 0.138 - - 1.53e-03 1.24e-04 60.950 57
CPL 1.529 0.542 106.0 0.0 1.98e-03 0.00e+00 60.420 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 1.625 0.277 - - 1.27e-02 2.32e-03 85.690 57
CPL -0.616 1.900 56.6 16.7 1.78e-01 1.12e+00 78.730 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: 193.152000 sec.
T50 in the 50-300 keV band: 113.728000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 302.816 -92.984 209.832
T90 263.616 -75.752 187.864
T50 116.480 -4.440 112.040
Peak 1.000 110.780 111.780
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
190.3961 71.8394 0.0159 36.1292 144.5754 7.2222719 12.024 TRIG_00637899
Foreground time interval of the image:
-92.984 209.832 (delta_t = 302.816 [sec])
Background time interval of the image:
-239.000 -92.984 (delta_t = 146.016 [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 -92.984 sec. to 209.832 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74613 ( -0.136358 0.139085 )
Norm@50keV : 1.53236E-03 ( -0.000124322 0.000123155 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.95 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 57 degrees of freedom
# Null hypothesis probability = 3.358721e-01
Photon flux (15-150 keV) in 302.8 sec: 0.206906 ( -0.0161141 0.0161458 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.28244e-06 ( -3.58394e-07 3.6091e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -92.984 sec. to 209.832 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52893 ( -0.558526 0.526045 )
Epeak [keV] : 105.971 ( )
Norm@50keV : 1.98293E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.42 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 56 degrees of freedom
# Null hypothesis probability = 3.191953e-01
Photon flux (15-150 keV) in 302.8 sec: 0.204631 ( -0.016936 0.016931 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.21573e-06 ( -3.93216e-07 3.90733e-07 ) ergs/cm2
Band function
Time interval is from -92.984 sec. to 209.832 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.52935 ( 1.4889 0.364706 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 106.049 ( -43.2386 -106.049 )
Norm@50keV : 1.98164E-03 ( -0.00014876 0.00179681 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.42 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 55 degrees of freedom
# Null hypothesis probability = 2.863829e-01
Photon flux (15-150 keV) in 302.8 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] : 13.4270 (-1.27874 1.41164)
R^2/D10^2 : 3.24877E-02 (-0.00999313 0.0144434)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 107.23 using 59 PHA bins.
# Reduced chi-squared = 1.8812 for 57 degrees of freedom
# Null hypothesis probability = 6.448954e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.758e-07 5.148e-08
25- 50 1.339e-06 1.376e-07
50-150 1.555e-06 2.488e-07
15-150 3.270e-06 3.031e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 127.987 (-35.6542 55.2756)
Norm : 0.858385 (-0.0807684 0.102679)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.08 using 59 PHA bins.
# Reduced chi-squared = 1.072 for 57 degrees of freedom
# Null hypothesis probability = 3.314618e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.750e-07 7.116e-08
25- 50 1.221e-06 1.317e-07
50-150 2.247e-06 7.988e-07
15-150 4.143e-06 9.730e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.51101 (-1.20859 1.45719)
R1^2/D10^2 : 0.566798 (-0.330889 1.01476)
kT2 [keV] : 21.2213 (-3.47667 5.45934)
R2^2/D10^2 : 4.94420E-03 (-0.00287476 0.00500182)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.10 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 55 degrees of freedom
# Null hypothesis probability = 2.963955e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.334e-07 2.924e-07
25- 50 1.156e-06 3.399e-07
50-150 2.236e-06 6.884e-07
15-150 4.125e-06 1.085e-06
Peak spectrum fit
Power-law model
Time interval is from 110.780 sec. to 111.780 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62522 ( -0.272465 0.28113 )
Norm@50keV : 1.27255E-02 ( -0.00232722 0.00230446 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.69 using 59 PHA bins.
# Reduced chi-squared = 1.503 for 57 degrees of freedom
# Null hypothesis probability = 8.299414e-03
Photon flux (15-150 keV) in 1 sec: 1.64832 ( -0.291665 0.292325 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.18667e-07 ( -2.26794e-08 2.30316e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 110.780 sec. to 111.780 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.615625 ( -2.25872 1.5421 )
Epeak [keV] : 56.5715 ( -9.84474 23.5541 )
Norm@50keV : 0.177763 ( -0.177765 2.05851 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.73 using 59 PHA bins.
# Reduced chi-squared = 1.406 for 56 degrees of freedom
# Null hypothesis probability = 2.427939e-02
Photon flux (15-150 keV) in 1 sec: 1.52611 ( -0.30481 0.30538 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05721e-07 ( -2.17911e-08 2.3684e-08 ) ergs/cm2
Band function
Time interval is from 110.780 sec. to 111.780 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.586703 ( -1.24108 2.09491 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 56.6823 ( -9.87026 23.5241 )
Norm@50keV : 0.172006 ( -0.176506 2.06339 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.73 using 59 PHA bins.
# Reduced chi-squared = 1.432 for 55 degrees of freedom
# Null hypothesis probability = 1.958685e-02
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] : 14.0034 (-2.09713 2.52523)
R^2/D10^2 : 0.254075 (-0.116869 0.204196)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.13 using 59 PHA bins.
# Reduced chi-squared = 1.388 for 57 degrees of freedom
# Null hypothesis probability = 2.787019e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.052e-08 3.156e-09
25- 50 3.915e-08 9.350e-09
50-150 5.056e-08 1.745e-08
15-150 1.002e-07 2.549e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 144.006 (-66.5354 -141.902)
Norm : 6.94979 (-1.30771 1.6982)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.14 using 59 PHA bins.
# Reduced chi-squared = 1.459 for 57 degrees of freedom
# Null hypothesis probability = 1.351528e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.791e-08 1.004e-08
25- 50 3.300e-08 1.824e-08
50-150 6.402e-08 4.007e-08
15-150 1.149e-07 6.685e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.22267 (-3.16125 -3.16125)
R1^2/D10^2 : 17.7672 ( )
kT2 [keV] : 14.8711 (-2.5767 -14.8711)
R2^2/D10^2 : 0.195583 (-0.195554 0.20833)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.89 using 59 PHA bins.
#Fit statistic : Chi-Squared = 77.85 using 59 PHA bins.
# Reduced chi-squared = 1.416 for 55 degrees of freedom
# Reduced chi-squared = 1.416 for 55 degrees of freedom
# Null hypothesis probability = 2.281922e-02
# Null hypothesis probability = 2.297029e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.355e-08 5.851e-09
25- 50 3.644e-08 1.793e-08
50-150 5.380e-08 3.161e-08
15-150 1.038e-07 5.595e-08
Plot creation:
Tue Apr 14 08:20:04 EDT 2015