batgrbproduct Analysis for Trigger=549824
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): Wed Feb 27 16:10:16 EST 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger549824/GCN5_download_cron
======================================================================
Trigger: 00549824 Segment: 000
BAT Trigger Time: 383609832 [s; MET]
Trigger Stop: 383610216 [s; MET]
UTC: 2013-02-26T22:17:01.737120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 273.981572397516 Dec: -14.0278369523884 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.28
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.28
Flight Position: [ source = BAT ]
RA: 273.981572397516 Dec: -14.0278369523884 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 273.994466928721 Dec: -14.0564684570683 [deg; J2000]
{ 18h 15m 58.7s , -14d 03' 23.3" }
+/- 2.6282754648754 [arcmin] (estimated 90% radius based on SNR)
+/- 1.75817933544852 [arcmin] (formal 1-sigma fit error)
SNR: 7.64871625422337
Angular difference between Flight and Ground position is 1.874694 arcmin
Partial Coding Fraction: 0.8203125 [ including projection effects ]
Duration
T90: 535.151999950409 +/- 57.433624711725
Measured from: -50.2959998846054
to: 484.856000065804 [s; relative to TRIGTIME]
T50: 255.003999948502 +/- 76.4926529336411
Measured from: 44.7040001153946
to: 299.708000063896 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 500.768000006676
to: 501.768000006676 [s; relative to TRIGTIME]
Total Fluence
Measured from: -78.5360000133514
to: 503.611999988556 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.806463 0.518201 0.154489 0.048158
0.155548 0.147975 0.124643 0.106402 [error]
Peak 0.009488 0.021129 0.014392 0.009688
0.009721 0.009589 0.008333 0.007168 [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 8.67e-07 3.06e-07 6.15e-08 1.46e-08 1.24e-06 1.25e-06 erg/cm2
Error 1.08e-07 7.85e-08 3.55e-08 1.50e-08 1.69e-07 1.72e-07 erg/cm2
Peak flux Power-law 8.46e-02 1.14e-01 1.14e-01 2.04e-01 8.60e-01 5.61e-02 ph/cm2/s
Error 1.04e-01 9.81e-02 8.87e-02 2.93e-01 9.50e-01 0.00e+00 ph/cm2/s
Fluence Cutoff-PL 9.05e-07 2.22e-07 1.50e-09 1.75e-14 1.13e-06 1.13e-06 erg/cm2
Error 1.16e-07 1.01e-07 1.75e-08 6.58e-10 1.51e-07 1.51e-07 erg/cm2
Peak flux Cutoff-PL 9.03e-02 1.17e-01 1.12e-01 1.92e-01 3.83e-01 5.13e-01 ph/cm2/s
Error 1.04e-01 9.83e-02 6.58e-02 8.70e-01 3.01e-01 1.21e+00 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.316 0.475 - - 7.65e-05 3.44e-05 60.070 57
CPL 1.000 0.000 50.0 0.0 7.57e-04 0.00e+00 171.560 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -2.497 0.000 - - 3.55e-05 2.52e-03 56.800 57
CPL 1.043 1.176 9999.4 0.0 3.32e-03 -7.10e-04 56.940 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 582.148 -78.536 503.612
T90 535.152 -50.296 484.856
T50 255.004 44.704 299.708
Peak 1.000 500.768 501.768
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
273.9945 -14.0565 0.0251 25.5 164.3 2.4434 7.6 TRIG_00549824
------------------------------------------
Foreground time interval of the image:
-14.699 148.410 (delta_t = 163.109 [sec])
149.000 408.001 (delta_t = 259.001 [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
-78.536000 148.410000
149.000000 503.612000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.31557 ( -0.449467 0.501265 )
Norm@50keV : 7.65220E-05 ( -2.98866e-05 3.89989e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.07 using 59 PHA bins.
# Reduced chi-squared = 1.054 for 57 degrees of freedom
# Null hypothesis probability = 3.650837e-01
Photon flux (15-150 keV) in 581.6 sec: 6.24637E-02 ( -0.0074615 0.00746385 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24454e-06 ( -1.65657e-07 1.71521e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-78.536000 148.410000
149.000000 503.612000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 7.56791E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 171.56 using 59 PHA bins.
# Reduced chi-squared = 3.0636 for 56 degrees of freedom
# Null hypothesis probability = 1.178415e-13
Photon flux (15-150 keV) in 581.6 sec: 6.05186E-02 ( -0.0074741 0.0072584 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12871e-06 ( -1.45941e-07 1.56032e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-78.536000 148.410000
149.000000 503.612000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.16717 ( 8.16717 8.16717 )
beta : -4.31551 ( -0.501677 0.449429 )
Epeak [keV] : 4.07865 ( -4.07865 -4.07865 )
Norm@50keV : 1.04010E-02 ( -0.00406238 0.00530013 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.07 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 55 degrees of freedom
# Null hypothesis probability = 2.971524e-01
Photon flux (15-150 keV) in 581.6 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] : 3.47723 (-0.380061 0.429873)
R^2/D10^2 : 3.52473 (-1.74198 3.6267)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.03 using 59 PHA bins.
# Reduced chi-squared = 0.9830 for 57 degrees of freedom
# Null hypothesis probability = 5.114774e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.064e-07 2.299e-07
25- 50 2.153e-07 7.526e-08
50-150 1.054e-09 8.495e-10
15-150 1.123e-06 3.141e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.64099 (-1.37802 1.81093)
Norm : 3.94458 (-1.59157 2.88664)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.74 using 59 PHA bins.
# Reduced chi-squared = 0.9954 for 57 degrees of freedom
# Null hypothesis probability = 4.849111e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.953e-07 1.954e-07
25- 50 2.581e-07 8.500e-08
50-150 7.799e-09 6.255e-09
15-150 1.161e-06 2.978e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.45699 (-0.38111 0.416705)
R1^2/D10^2 : 3.63503 (-1.77054 4.34238)
kT2 [keV] : 200.000 ( )
R2^2/D10^2 : 1.32253E-06 (-1.32253e-06 -1.32253e-06)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.74 using 59 PHA bins.
#Fit statistic : Chi-Squared = 54.72 using 59 PHA bins.
# Reduced chi-squared = 0.9953 for 55 degrees of freedom
# Reduced chi-squared = 0.9949 for 55 degrees of freedom
# Null hypothesis probability = 4.845038e-01
# Null hypothesis probability = 4.853022e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.060e-07 2.287e-07
25- 50 2.189e-07 6.892e-08
50-150 1.798e-07 9.425e-10
15-150 1.305e-06 3.112e-07
Peak spectrum fit
Power-law model
Time interval is from 500.768 sec. to 501.768 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49665 ( )
Norm@50keV : 3.54580E-05 ( -1.92833e-05 0.00502851 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.80 using 59 PHA bins.
# Reduced chi-squared = 0.9964 for 57 degrees of freedom
# Null hypothesis probability = 4.827327e-01
Photon flux (15-150 keV) in 1 sec: 5.60599E-02 ( -0.0560433 0.530541 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03062e-08 ( -1.03029e-08 4.42042e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 500.768 sec. to 501.768 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04312 ( -1.04091 1.31171 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 3.32078E-03 ( -0.00189826 -0.00331806 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.94 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 56 degrees of freedom
# Null hypothesis probability = 4.400504e-01
Photon flux (15-150 keV) in 1 sec: 0.383350 ( -0.38335 0.218431 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.48453e-08 ( -3.48453e-08 1.04096e-08 ) ergs/cm2
Band function
Time interval is from 500.768 sec. to 501.768 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -10.0000 ( -5 -5 )
beta : 2.22941 ( -2.15037 -2.15037 )
Epeak [keV] : 48.1903 ( -46.0122 -46.0122 )
Norm@50keV : 1.49665E-02 ( -0.014936 0.66344 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.59 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 55 degrees of freedom
# Null hypothesis probability = 4.155617e-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] : 12.4387 (-5.49748 -12.4387)
R^2/D10^2 : 8.78291E-02 (-0.0878115 0.620345)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.03 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 57 degrees of freedom
# Null hypothesis probability = 4.372721e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.880e-09 2.000e-09
25- 50 9.448e-09 6.555e-09
50-150 8.997e-09 7.685e-09
15-150 2.133e-08 1.451e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.360 (-199.363 -199.363)
Norm : 1.60673 (-0.904057 0.90403)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.75 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 57 degrees of freedom
# Null hypothesis probability = 4.474606e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.001e-09 2.817e-09
25- 50 7.696e-09 5.435e-09
50-150 1.688e-08 1.179e-08
15-150 2.858e-08 1.939e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.363 (-199.363 -199.363)
R1^2/D10^2 : 9.05033E-05 (-7.28251e-05 0.00442318)
kT2 [keV] : 9.43357 (-4.44683 8.73304)
R2^2/D10^2 : 0.188878 (-0.180421 1.65506)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.33 using 59 PHA bins.
# Reduced chi-squared = 0.9879 for 55 degrees of freedom
# Null hypothesis probability = 5.000373e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.463e-09 2.395e-09
25- 50 8.629e-09 6.375e-09
50-150 2.733e-08 6.735e-09
15-150 3.942e-08 1.433e-08
Plot creation:
Wed Feb 27 16:43:27 EST 2013