batgrbproduct Analysis for Trigger=430151
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 Jul 28 17:05:39 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger430151/GCN5_download_cron
======================================================================
Trigger: 00430151 Segment: 000
BAT Trigger Time: 301976310.272 [s; MET]
Trigger Stop: 301976311.296 [s; MET]
UTC: 2010-07-28T02:18:24.246260 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 88.7434860359876 Dec: -15.2620375155607 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 18.8
Image Trigger?: NO
Rate S/N Ratio: 47.6235235991626 [ if not an image trigger ]
Image S/N Ratio: 18.8
Flight Position: [ source = BAT ]
RA: 88.7434860359876 Dec: -15.2620375155607 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 88.7527028309921 Dec: -15.2591611173141 [deg; J2000]
{ 05h 55m 00.6s , -15d 15' 33.0" }
+/- 0.487927061114699 [arcmin] (estimated 90% radius based on SNR)
+/- 0.116672781682549 [arcmin] (formal 1-sigma fit error)
SNR: 84.7862950413489
Angular difference between Flight and Ground position is 0.560728 arcmin
Partial Coding Fraction: 0.8125 [ including projection effects ]
Duration
T90: 198.547999978065 +/- 12.646583703569
Measured from: -39.891999900341
to: 158.656000077724 [s; relative to TRIGTIME]
T50: 72.5119999647141 +/- 1.03045622946166
Measured from: 12.6600000858307
to: 85.1720000505447 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 28.2639999985695
to: 29.2639999985695 [s; relative to TRIGTIME]
Total Fluence
Measured from: -84.3280000090599
to: 333.983999967575 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 11.413556 18.312345 18.251815 6.145445
0.108457 0.116308 0.108794 0.092197 [error]
Peak 0.094804 0.185940 0.275677 0.110813
0.006745 0.008204 0.009073 0.007616 [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 3.50e-06 7.83e-06 1.38e-05 5.74e-05 3.78e-05 8.25e-05 erg/cm2
Error 1.06e-07 1.42e-07 1.67e-07 1.66e-06 4.49e-07 1.66e-06 erg/cm2
Peak flux Power-law 8.68e-01 1.39e+00 1.68e+00 3.96e+00 5.07e+00 7.89e+00 ph/cm2/s
Error 7.52e-02 7.23e-02 6.76e-02 3.61e-01 1.97e-01 3.81e-01 ph/cm2/s
Fluence Cutoff-PL 3.45e-06 7.83e-06 1.39e-05 5.54e-05 3.78e-05 7.89e-05 erg/cm2
Error 1.48e-07 1.43e-07 1.91e-07 4.00e-06 4.56e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 8.66e-01 1.39e+00 1.68e+00 3.93e+00 5.07e+00 7.86e+00 ph/cm2/s
Error 7.52e-02 7.24e-02 6.77e-02 3.79e-01 0.00e+00 0.00e+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 1.178 0.023 - - 8.85e-03 1.20e-04 22.710 57
CPL 1.145 0.074 1747.9 -246.7 9.10e-03 0.00e+00 22.300 56
The chi2 of BB fit is 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 0.728 0.070 - - 4.39e-02 1.76e-03 74.210 57
CPL 0.724 0.071 9999.4 0.0 4.42e-02 4.93e-03 74.290 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: 165.376000 sec.
T50 in the 50-300 keV band: 62.848000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 418.312 -84.328 333.984
T90 198.548 -39.892 158.656
T50 72.512 12.660 85.172
Peak 1.000 28.264 29.264
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
88.7527 -15.2592 0.0023 29.4 -177.0 6.9843 84.8 TRIG_00430151
------------------------------------------
Foreground time interval of the image:
-15.871 11.529 (delta_t = 27.400 [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
Time interval is from -84.328 sec. to 333.984 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17812 ( -0.0230971 0.0229979 )
Norm@50keV : 8.84642E-03 ( -0.000120082 0.000119769 )
------------------------------------------------------------
# Chi-Squared = 22.71 using 59 PHA bins.
# Reduced chi-squared = 0.3984 for 57 degrees of freedom
# Null hypothesis probability = 9.999864e-01
Photon flux (15-150 keV) in 418.3 sec: 1.03530 ( -0.015759 0.0158324 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.77786e-05 ( -4.48777e-07 4.48727e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -84.328 sec. to 333.984 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.14544 ( -0.11034 0.0378354 )
Epeak [keV] : 1747.91 ( -506.911 -1000.26 )
Norm@50keV : 9.09777E-03 ( )
------------------------------------------------------------
# Chi-Squared = 22.30 using 59 PHA bins.
# Reduced chi-squared = 0.3982 for 56 degrees of freedom
# Null hypothesis probability = 9.999840e-01
Photon flux (15-150 keV) in 418.3 sec: 1.03461 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.77671e-05 ( -4.56574e-07 4.56407e-07 ) ergs/cm2
Band function
Time interval is from -84.328 sec. to 333.984 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.07620 ( 0.791401 0.791401 )
beta : -1.18628 ( 1.28997 9.82019 )
Epeak [keV] : 399.821 ( -394.714 -394.714 )
Norm@50keV : 9.97681E-03 ( -0.00123495 0 )
------------------------------------------------------------
# Chi-Squared = 22.27 using 59 PHA bins.
# Reduced chi-squared = 0.4050 for 55 degrees of freedom
# Null hypothesis probability = 9.999748e-01
Photon flux (15-150 keV) in 418.3 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] : ( )
R^2/D10^2 : ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
Norm : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : ( )
R1^2/D10^2 : ( )
kT2 [keV] : ( )
R2^2/D10^2 : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Peak spectrum fit
Power-law model
Time interval is from 28.264 sec. to 29.264 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.728052 ( -0.0704756 0.0693954 )
Norm@50keV : 4.39342E-02 ( -0.00176221 0.00175513 )
------------------------------------------------------------
# Chi-Squared = 74.21 using 59 PHA bins.
# Reduced chi-squared = 1.302 for 57 degrees of freedom
# Null hypothesis probability = 6.242188e-02
Photon flux (15-150 keV) in 1 sec: 5.06803 ( -0.196992 0.197114 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.29598e-07 ( -2.2529e-08 2.26098e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 28.264 sec. to 29.264 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.723979 ( -0.0739325 0.0674213 )
Epeak [keV] : 9999.36 ( -10000 -10000 )
Norm@50keV : 4.42447E-02 ( -0.00176083 0.0081055 )
------------------------------------------------------------
# Chi-Squared = 74.29 using 59 PHA bins.
# Reduced chi-squared = 1.327 for 56 degrees of freedom
# Null hypothesis probability = 5.144342e-02
Photon flux (15-150 keV) in 1 sec: 5.06695 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.29804e-07 ( -2.2547e-08 2.2626e-08 ) ergs/cm2
Band function
Time interval is from 28.264 sec. to 29.264 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.04002 ( 1.04002 1.04002 )
beta : -0.728052 ( -0.0693468 0.0705593 )
Epeak [keV] : 18.7023 ( -18.7023 -18.7023 )
Norm@50keV : 5.65331E-02 ( -0.0124006 672567 )
------------------------------------------------------------
# Chi-Squared = 74.21 using 59 PHA bins.
# Reduced chi-squared = 1.349 for 55 degrees of freedom
# Null hypothesis probability = 4.310209e-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] : ( )
R^2/D10^2 : ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
Norm : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : ( )
R1^2/D10^2 : ( )
kT2 [keV] : ( )
R2^2/D10^2 : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Plot creation:
Wed Jul 28 17:31:52 EDT 2010