batgrbproduct Analysis for Trigger=373788
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 May 31 15:42:45 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger373788/SDC
======================================================================
Trigger: 00373788 Segment: 000
BAT Trigger Time: 278174360 [s; MET]
Trigger Stop: 278174680 [s; MET]
UTC: 2009-10-25T14:39:14.797780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 310.06896094738 Dec: 41.4911421784769 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.78
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.78
Flight Position: [ source = BAT ]
RA: 310.06896094738 Dec: 41.4911421784769 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 310.012818200989 Dec: 41.4803144254387 [deg; J2000]
{ 20h 40m 03.1s , +41d 28' 49.1" }
+/- 2.76762973009821 [arcmin] (estimated 90% radius based on SNR)
+/- 1.65678366114239 [arcmin] (formal 1-sigma fit error)
SNR: 7.10453308659781
Angular difference between Flight and Ground position is 2.605748 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
T50: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 320 second)
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.545205 0.298538 0.058282 -0.012898
0.058289 0.057558 0.051132 0.047050 [error]
Peak 0.545205 0.298538 0.058282 -0.012898
0.058289 0.057558 0.051132 0.047050 [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 1.53e-07 1.12e-07 5.45e-08 3.76e-08 3.37e-07 3.57e-07 erg/cm2
Error 2.70e-08 2.88e-08 2.93e-08 4.36e-08 7.74e-08 9.63e-08 erg/cm2
Peak flux Power-law 4.14e-02 1.71e-02 4.15e-03 1.23e-03 6.34e-02 6.39e-02 ph/cm2/s
Error 7.48e-03 4.18e-03 2.16e-03 1.14e-03 1.07e-02 1.09e-02 ph/cm2/s
Fluence Cutoff-PL 1.57e-07 1.17e-07 1.68e-08 2.27e-10 2.91e-07 2.91e-07 erg/cm2
Error 2.93e-08 3.73e-08 3.47e-08 2.37e-08 7.27e-08 8.57e-08 erg/cm2
Peak flux Cutoff-PL 4.20e-02 1.83e-02 1.43e-03 1.04e-05 6.17e-02 6.17e-02 ph/cm2/s
Error 8.02e-03 5.34e-03 2.64e-03 7.28e-04 1.03e-02 1.03e-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 3.040 0.462 - - 2.24e-04 9.08e-05 51.210 57
CPL 0.831 0.000 14.2 0.0 9.44e-03 0.00e+00 49.090 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 3.040 0.462 - - 2.24e-04 9.08e-05 51.210 57
CPL 0.831 0.000 14.2 0.0 9.44e-03 0.00e+00 49.090 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 320.000 0.000 320.000
T90 320.000 0.000 320.000
T50 320.000 0.000 320.000
Peak 320.000 0.000 320.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
310.0128 +41.4803 0.0271 8.9 58.3 0.8967 7.1 TRIG_00373788
------------------------------------------
Foreground time interval of the image:
0.000 123.041 (delta_t = 123.041 [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 123.041 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.04025 ( -0.422046 0.502465 )
Norm@50keV : 2.23996E-04 ( -8.55412e-05 9.59879e-05 )
------------------------------------------------------------
# Chi-Squared = 51.21 using 59 PHA bins.
# Reduced chi-squared = 0.8984 for 57 degrees of freedom
# Null hypothesis probability = 6.911364e-01
Photon flux (15-150 keV) in 123 sec: 6.34386E-02 ( -0.010713 0.0107604 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.37303e-07 ( -7.3613e-08 8.12452e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 123.041 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.830864 ( )
Epeak [keV] : 14.1856 ( )
Norm@50keV : 9.44398E-03 ( )
------------------------------------------------------------
# Chi-Squared = 49.09 using 59 PHA bins.
# Reduced chi-squared = 0.8766 for 56 degrees of freedom
# Null hypothesis probability = 7.318301e-01
Photon flux (15-150 keV) in 123 sec: 6.17054E-02 ( -0.0102862 0.0103696 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.9125e-07 ( -5.92909e-08 8.61713e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 123.041 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.23286E-02 ( 0.94147 0.94147 )
beta : -4.12934 ( 10 19.9998 )
Epeak [keV] : 16.9651 ( -3.81357 8.40292 )
Norm@50keV : 4.59803E-02 ( -0.0460294 318.737 )
------------------------------------------------------------
# Chi-Squared = 48.97 using 59 PHA bins.
# Reduced chi-squared = 0.8904 for 55 degrees of freedom
# Null hypothesis probability = 7.028924e-01
Photon flux (15-150 keV) in 123 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 0.000 sec. to 123.041 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.04025 ( -0.422046 0.502465 )
Norm@50keV : 2.23996E-04 ( -8.55412e-05 9.59879e-05 )
------------------------------------------------------------
# Chi-Squared = 51.21 using 59 PHA bins.
# Reduced chi-squared = 0.8984 for 57 degrees of freedom
# Null hypothesis probability = 6.911364e-01
Photon flux (15-150 keV) in 123 sec: 6.34386E-02 ( -0.010713 0.0107604 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.37303e-07 ( -7.3613e-08 8.12452e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 123.041 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.830864 ( )
Epeak [keV] : 14.1856 ( )
Norm@50keV : 9.44398E-03 ( )
------------------------------------------------------------
# Chi-Squared = 49.09 using 59 PHA bins.
# Reduced chi-squared = 0.8766 for 56 degrees of freedom
# Null hypothesis probability = 7.318301e-01
Photon flux (15-150 keV) in 123 sec: 6.17054E-02 ( -0.0102862 0.0103696 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.9125e-07 ( -5.92909e-08 8.61713e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 123.041 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.23286E-02 ( 0.94147 0.94147 )
beta : -4.12934 ( 10 19.9998 )
Epeak [keV] : 16.9651 ( -3.81357 8.40292 )
Norm@50keV : 4.59803E-02 ( -0.0460294 318.737 )
------------------------------------------------------------
# Chi-Squared = 48.97 using 59 PHA bins.
# Reduced chi-squared = 0.8904 for 55 degrees of freedom
# Null hypothesis probability = 7.028924e-01
Photon flux (15-150 keV) in 123 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:
Tue May 31 15:50:47 EDT 2011