batgrbproduct Analysis for Trigger=554135
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 Apr 22 12:51:38 EDT 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger554135/GCN5_download_cron
======================================================================
Trigger: 00554135 Segment: 000
BAT Trigger Time: 388270940.544 [s; MET]
Trigger Stop: 388270941.568 [s; MET]
UTC: 2013-04-21T21:02:10.076440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 235.705864882032 Dec: 58.4976429849443 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.74
Image Trigger?: NO
Rate S/N Ratio: 5.3851648071345 [ if not an image trigger ]
Image S/N Ratio: 6.74
Flight Position: [ source = BAT ]
RA: 235.705864882032 Dec: 58.4976429849443 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 235.72779596562 Dec: 58.4408944406636 [deg; J2000]
{ 15h 42m 54.7s , +58d 26' 27.2" }
+/- 5.81397274942039 [arcmin] (estimated 90% radius based on SNR)
+/- 3.17498572469856 [arcmin] (formal 1-sigma fit error)
SNR: 2.46044751824129
Angular difference between Flight and Ground position is 3.473754 arcmin
Partial Coding Fraction: 0.875 [ including projection effects ]
Duration
T90: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
T50: 1.02399998903275 +/-
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02399998903275 second)
Measured from: -2.98023223876953e-08
to: 1.02399995923042 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02399998903275 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total -0.005358 0.023955 0.018111 0.001252
0.005966 0.006010 0.005364 0.004665 [error]
Peak -0.005358 0.023955 0.018111 0.001252
0.005966 0.006010 0.005364 0.004665 [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 2.22e-09 5.45e-09 1.08e-08 5.91e-08 2.96e-08 6.92e-08 erg/cm2
Error 1.54e-09 2.65e-09 4.52e-09 4.80e-08 1.26e-08 5.10e-08 erg/cm2
Peak flux Power-law 6.59e-02 9.06e-02 9.19e-02 1.70e-01 3.03e-01 4.18e-01 ph/cm2/s
Error 4.86e-02 4.57e-02 3.87e-02 1.32e-01 1.31e-01 1.81e-01 ph/cm2/s
Fluence Cutoff-PL 3.80e-10 1.07e-08 1.20e-08 1.23e-10 2.32e-08 2.32e-08 erg/cm2
Error 4.60e-10 3.89e-09 4.40e-09 6.05e-10 7.17e-09 7.17e-09 erg/cm2
Peak flux Cutoff-PL 1.06e-02 1.66e-01 1.18e-01 6.98e-04 2.96e-01 2.96e-01 ph/cm2/s
Error 1.34e-02 5.89e-02 5.11e-02 3.29e-03 8.87e-02 8.88e-02 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 1.062 0.595 - - 2.68e-03 1.14e-03 56.830 57
CPL -9.897 0.000 52.6 7.0 6.22e+02 1.41e+03 41.790 56
The chi2 of BB fit is 49.50 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 1.062 0.595 - - 2.68e-03 1.14e-03 56.830 57
CPL -9.897 0.000 52.6 7.0 6.22e+02 1.41e+03 41.790 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 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 -0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
235.7278 +58.4409 0.0780 26.5 -27.0 0.0278 2.5 TRIG_00554135
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-239.544 -56.853 (delta_t = 182.690 [sec])
-55.544 -4.544 (delta_t = 51.000 [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 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06200 ( -0.708703 0.481196 )
Norm@50keV : 2.68404E-03 ( -0.00111715 0.00116011 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.83 using 59 PHA bins.
# Reduced chi-squared = 0.9971 for 57 degrees of freedom
# Null hypothesis probability = 4.812888e-01
Photon flux (15-150 keV) in 1.024 sec: 0.302997 ( -0.130124 0.132598 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.95825e-08 ( -1.22963e-08 1.2857e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.89685 ( )
Epeak [keV] : 52.5661 ( -6.573 7.34243 )
Norm@50keV : 622.241 ( -661.955 2159.01 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.79 using 59 PHA bins.
# Reduced chi-squared = 0.7463 for 56 degrees of freedom
# Null hypothesis probability = 9.210119e-01
Photon flux (15-150 keV) in 1.024 sec: 0.295563 ( -0.088447 0.089026 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3192e-08 ( -7.07779e-09 7.25289e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -2.47666 -5 )
beta : -4.20066 ( 4.14729 4.27606 )
Epeak [keV] : 55.9417 ( -8.72861 10.5763 )
Norm@50keV : 3.18346 ( -0.991172 6.16834 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.37 using 59 PHA bins.
# Reduced chi-squared = 0.8067 for 55 degrees of freedom
# Null hypothesis probability = 8.468195e-01
Photon flux (15-150 keV) in 1.024 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] : 17.2954 (-4.14575 6.89775)
R^2/D10^2 : 2.96499E-02 (-0.0295957 0.0462654)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.50 using 59 PHA bins.
# Reduced chi-squared = 0.8685 for 57 degrees of freedom
# Null hypothesis probability = 7.492641e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.841e-09 1.232e-09
25- 50 8.256e-09 5.028e-09
50-150 1.773e-08 1.199e-08
15-150 2.782e-08 1.711e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.344 ( )
Norm : 1.09420 (-0.58891 0.591657)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.93 using 59 PHA bins.
# Reduced chi-squared = 1.034 for 57 degrees of freedom
# Null hypothesis probability = 4.048134e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.232221 (-0.232221 -0.232221)
R1^2/D10^2 : 3.26661E-02 (-0.0326661 -0.0326661)
kT2 [keV] : 17.3067 (-4.14126 6.90221)
R2^2/D10^2 : 2.95866E-02 (-0.020662 0.0462767)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.50 using 59 PHA bins.
# Reduced chi-squared = 0.9001 for 55 degrees of freedom
# Null hypothesis probability = 6.837983e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06200 ( -0.708703 0.481196 )
Norm@50keV : 2.68404E-03 ( -0.00111715 0.00116011 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.83 using 59 PHA bins.
# Reduced chi-squared = 0.9971 for 57 degrees of freedom
# Null hypothesis probability = 4.812888e-01
Photon flux (15-150 keV) in 1.024 sec: 0.302997 ( -0.130124 0.132598 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.95825e-08 ( -1.22963e-08 1.2857e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.89685 ( )
Epeak [keV] : 52.5661 ( -6.573 7.34243 )
Norm@50keV : 622.241 ( -661.955 2159.01 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.79 using 59 PHA bins.
# Reduced chi-squared = 0.7463 for 56 degrees of freedom
# Null hypothesis probability = 9.210119e-01
Photon flux (15-150 keV) in 1.024 sec: 0.295563 ( -0.088447 0.089026 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.3192e-08 ( -7.07779e-09 7.25289e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -2.47666 -5 )
beta : -4.20066 ( 4.14729 4.27606 )
Epeak [keV] : 55.9417 ( -8.72861 10.5763 )
Norm@50keV : 3.18346 ( -0.991172 6.16834 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.37 using 59 PHA bins.
# Reduced chi-squared = 0.8067 for 55 degrees of freedom
# Null hypothesis probability = 8.468195e-01
Photon flux (15-150 keV) in 1.024 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] : 17.2954 (-4.14575 6.89775)
R^2/D10^2 : 2.96499E-02 (-0.0295957 0.0462654)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.50 using 59 PHA bins.
# Reduced chi-squared = 0.8685 for 57 degrees of freedom
# Null hypothesis probability = 7.492641e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.841e-09 1.185e-09
25- 50 8.256e-09 5.192e-09
50-150 1.773e-08 1.188e-08
15-150 2.782e-08 1.867e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.344 ( )
Norm : 1.09420 (-0.58891 0.591657)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.93 using 59 PHA bins.
# Reduced chi-squared = 1.034 for 57 degrees of freedom
# Null hypothesis probability = 4.048134e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.232221 (-0.232221 -0.232221)
R1^2/D10^2 : 3.26661E-02 (-0.0326661 -0.0326661)
kT2 [keV] : 17.3067 (-4.14126 6.90221)
R2^2/D10^2 : 2.95866E-02 (-0.020662 0.0462767)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.50 using 59 PHA bins.
# Reduced chi-squared = 0.9001 for 55 degrees of freedom
# Null hypothesis probability = 6.837983e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Mon Apr 22 13:08:20 EDT 2013