batgrbproduct Analysis for Trigger=457076
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 Jul 12 17:44:42 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger457076/GCN5_download_cron
======================================================================
Trigger: 00457076 Segment: 000
BAT Trigger Time: 332106304 [s; MET]
Trigger Stop: 332106368 [s; MET]
UTC: 2011-07-11T19:44:56.853380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 344.491076339576 Dec: -65.600127171144 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.04
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.04
Flight Position: [ source = BAT ]
RA: 344.491076339576 Dec: -65.600127171144 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 344.44302658005 Dec: -65.636193837731 [deg; J2000]
{ 22h 57m 46.3s , -65d 38' 10.3" }
+/- 3.3021080526503 [arcmin] (estimated 90% radius based on SNR)
+/- 2.35076717179753 [arcmin] (formal 1-sigma fit error)
SNR: 5.52062159071785
Angular difference between Flight and Ground position is 2.469683 arcmin
Partial Coding Fraction: 0.609375 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.280111 0.288101 -0.038682 0.059658
0.058708 0.059705 0.052959 0.045927 [error]
Peak 0.280111 0.288101 -0.038682 0.059658
0.058708 0.059705 0.052959 0.045927 [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 1.05e-07 9.13e-08 5.42e-08 4.84e-08 2.72e-07 2.99e-07 erg/cm2
Error 2.98e-08 3.12e-08 3.63e-08 6.78e-08 9.33e-08 1.28e-07 erg/cm2
Peak flux Power-law 5.45e-02 2.65e-02 7.86e-03 2.95e-03 9.05e-02 9.18e-02 ph/cm2/s
Error 1.57e-02 8.68e-03 5.10e-03 3.89e-03 2.37e-02 2.43e-02 ph/cm2/s
Fluence Cutoff-PL 1.05e-07 1.15e-07 1.19e-08 2.44e-11 2.32e-07 2.32e-07 erg/cm2
Error 3.42e-08 4.44e-08 2.57e-08 4.62e-09 6.55e-08 6.55e-08 erg/cm2
Peak flux Cutoff-PL 5.24e-02 3.44e-02 2.01e-03 2.22e-06 8.88e-02 8.89e-02 ph/cm2/s
Error 1.79e-02 1.25e-02 3.90e-03 3.59e-04 2.23e-02 2.23e-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 2.752 0.609 - - 3.92e-04 1.97e-04 64.190 57
CPL -2.555 4.828 25.0 15.3 2.08e+00 0.00e+00 60.130 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.752 0.609 - - 3.92e-04 1.97e-04 64.190 57
CPL -2.555 4.828 25.0 15.3 2.08e+00 0.00e+00 60.130 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
344.4430 -65.6362 0.0349 38.5 -16.1 0.6424 5.5 TRIG_00457076
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.75162 ( -0.535454 0.682223 )
Norm@50keV : 3.91733E-04 ( -0.000189038 0.000205902 )
------------------------------------------------------------
# Chi-Squared = 64.19 using 59 PHA bins.
# Reduced chi-squared = 1.126 for 57 degrees of freedom
# Null hypothesis probability = 2.392156e-01
Photon flux (15-150 keV) in 64 sec: 9.04974E-02 ( -0.0236242 0.0237284 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.71693e-07 ( -8.79469e-08 9.86464e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.55475 ( -6.80768 2.8487 )
Epeak [keV] : 25.0229 ( -23.9781 6.59726 )
Norm@50keV : 2.07545 ( )
------------------------------------------------------------
# Chi-Squared = 60.13 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 56 degrees of freedom
# Null hypothesis probability = 3.286382e-01
Photon flux (15-150 keV) in 64 sec: 8.87741E-02 ( -0.0222024 0.0223599 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31668e-07 ( -6.2544e-08 6.83949e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.25305 ( 1.66546 1.66546 )
beta : -7.29190 ( 5.88034 15.6276 )
Epeak [keV] : 23.9073 ( -3.80813 6.29431 )
Norm@50keV : 0.253198 ( -0.253225 64.7291 )
------------------------------------------------------------
# Chi-Squared = 60.14 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 55 degrees of freedom
# Null hypothesis probability = 2.950510e-01
Photon flux (15-150 keV) in 64 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] : 6.26634 (-1.31728 1.53415)
R^2/D10^2 : 0.296169 (-0.181459 0.524495)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 60.06 using 59 PHA bins.
# Reduced chi-squared = 1.054 for 57 degrees of freedom
# Null hypothesis probability = 3.655156e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.050e-07 6.038e-08
25- 50 1.149e-07 7.021e-08
50-150 1.253e-08 1.062e-08
15-150 2.324e-07 1.371e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 21.2806 (-8.36563 16.196)
Norm : 1.04439 (-0.458572 0.859892)
------------------------------------------------------------
# Chi-Squared = 61.97 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 57 degrees of freedom
# Null hypothesis probability = 3.033183e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.091e-07 4.842e-08
25- 50 1.001e-07 5.604e-08
50-150 3.320e-08 2.911e-08
15-150 2.423e-07 1.167e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.894 ( )
R1^2/D10^2 : 1.77213E-06 (-1.77213e-06 2.49895e-05)
kT2 [keV] : 6.20067 (-1.29765 1.54679)
R2^2/D10^2 : 0.307362 (-0.187812 0.560203)
------------------------------------------------------------
# Chi-Squared = 60.06 using 59 PHA bins.
# Chi-Squared = 59.89 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 55 degrees of freedom
# Reduced chi-squared = 1.089 for 55 degrees of freedom
# Null hypothesis probability = 2.973831e-01
# Null hypothesis probability = 3.027245e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.054e-07 1.741e-02
25- 50 1.167e-07 1.754e-01
50-150 1.301e-08 3.533e+00
15-150 2.351e-07 3.571e+00
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.75162 ( -0.535454 0.682223 )
Norm@50keV : 3.91733E-04 ( -0.000189038 0.000205902 )
------------------------------------------------------------
# Chi-Squared = 64.19 using 59 PHA bins.
# Reduced chi-squared = 1.126 for 57 degrees of freedom
# Null hypothesis probability = 2.392156e-01
Photon flux (15-150 keV) in 64 sec: 9.04974E-02 ( -0.0236242 0.0237284 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.71693e-07 ( -8.79469e-08 9.86464e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.55475 ( -6.80768 2.8487 )
Epeak [keV] : 25.0229 ( -23.9781 6.59726 )
Norm@50keV : 2.07545 ( )
------------------------------------------------------------
# Chi-Squared = 60.13 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 56 degrees of freedom
# Null hypothesis probability = 3.286382e-01
Photon flux (15-150 keV) in 64 sec: 8.87741E-02 ( -0.0222024 0.0223599 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.31668e-07 ( -6.2544e-08 6.83949e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.25305 ( 1.66546 1.66546 )
beta : -7.29190 ( 5.88034 15.6276 )
Epeak [keV] : 23.9073 ( -3.80813 6.29431 )
Norm@50keV : 0.253198 ( -0.253225 64.7291 )
------------------------------------------------------------
# Chi-Squared = 60.14 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 55 degrees of freedom
# Null hypothesis probability = 2.950510e-01
Photon flux (15-150 keV) in 64 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] : 6.26634 (-1.31728 1.53415)
R^2/D10^2 : 0.296169 (-0.181459 0.524495)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 60.06 using 59 PHA bins.
# Reduced chi-squared = 1.054 for 57 degrees of freedom
# Null hypothesis probability = 3.655156e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.050e-07 6.174e-08
25- 50 1.149e-07 7.014e-08
50-150 1.253e-08 1.009e-08
15-150 2.324e-07 1.405e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 21.2806 (-8.36563 16.196)
Norm : 1.04439 (-0.458572 0.859892)
------------------------------------------------------------
# Chi-Squared = 61.97 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 57 degrees of freedom
# Null hypothesis probability = 3.033183e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.091e-07 4.919e-08
25- 50 1.001e-07 5.737e-08
50-150 3.320e-08 2.818e-08
15-150 2.423e-07 1.108e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 199.894 ( )
R1^2/D10^2 : 1.77213E-06 (-1.77213e-06 2.49895e-05)
kT2 [keV] : 6.20067 (-1.29765 1.54679)
R2^2/D10^2 : 0.307362 (-0.187812 0.560203)
------------------------------------------------------------
# Chi-Squared = 60.06 using 59 PHA bins.
# Chi-Squared = 59.89 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 55 degrees of freedom
# Reduced chi-squared = 1.089 for 55 degrees of freedom
# Null hypothesis probability = 2.973831e-01
# Null hypothesis probability = 3.027245e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.054e-07 1.681e-02
25- 50 1.167e-07 1.399e-01
50-150 1.301e-08 4.048e+00
15-150 2.351e-07 3.584e+00
Plot creation:
Tue Jul 12 17:52:17 EDT 2011