batgrbproduct Analysis for Trigger=344485
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): Fri Jun 3 11:33:42 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger344485/SDC
======================================================================
Trigger: 00344485 Segment: 000
BAT Trigger Time: 257492962.752 [s; MET]
Trigger Stop: 257492963.776 [s; MET]
UTC: 2009-02-28T05:49:18.216780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 272.759184201732 Dec: -42.1944783639893 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.63
Image Trigger?: NO
Rate S/N Ratio: 21.0713075057055 [ if not an image trigger ]
Image S/N Ratio: 5.63
Flight Position: [ source = BAT ]
RA: 272.759184201732 Dec: -42.1944783639893 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 272.944898381749 Dec: -42.0446172974454 [deg; J2000]
{ 18h 11m 46.8s , -42d 02' 40.6" }
+/- 7.24315592267349 [arcmin] (estimated 90% radius based on SNR)
+/- 6.69956824675701 [arcmin] (formal 1-sigma fit error)
SNR: 1.7974219677523
Angular difference between Flight and Ground position is 12.213231 arcmin
Partial Coding Fraction: 0.8671875 [ including projection effects ]
Duration
T90: 62 +/- 12.6491106406735
Measured from: -2.75200000405312
to: 59.2479999959469 [s; relative to TRIGTIME]
T50: 33 +/- 13.0384048104053
Measured from: 16.2479999959469
to: 49.2479999959469 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 55.2479999959469
to: 56.2479999959469 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.75200000405312
to: 61.2479999959469 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.378881 0.444388 0.287497 0.633327
0.071195 0.081295 0.084345 0.105116 [error]
Peak 0.009678 0.018826 0.006898 0.047163
0.009632 0.011198 0.012029 0.015204 [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 1.04e-07 1.94e-07 2.77e-07 8.39e-07 7.90e-07 1.41e-06 erg/cm2
Error 3.13e-08 3.71e-08 8.48e-08 5.54e-07 2.01e-07 6.31e-07 erg/cm2
Peak flux Power-law 1.02e-01 1.20e-01 1.02e-01 1.48e-01 3.78e-01 4.72e-01 ph/cm2/s
Error 1.21e-01 1.05e-01 9.47e-02 9.32e-01 2.73e-01 4.51e-01 ph/cm2/s
Fluence Cutoff-PL 1.06e-07 1.94e-07 2.75e-07 8.20e-07 7.76e-07 1.33e-06 erg/cm2
Error 3.12e-08 3.88e-08 8.47e-08 5.58e-07 2.02e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 2.37e-02 1.92e-01 5.75e-02 5.55e-05 2.73e-01 3.80e-01 ph/cm2/s
Error 1.08e-01 1.38e-01 1.02e-01 3.02e-01 2.60e-01 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 1.482 0.371 - - 1.19e-03 2.61e-04 45.320 57
CPL 1.487 0.373 9999.3 0.0 1.19e-03 2.58e-03 45.330 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 1.235 1.896 - - 3.20e-03 2.79e-03 40.930 57
CPL -9.994 0.000 44.6 108.1 4.19e+03 4.44e+04 40.160 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: 55.936000 sec.
T50 in the 50-300 keV band: 30.208000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 70.000 -8.752 61.248
T90 62.000 -2.752 59.248
T50 33.000 16.248 49.248
Peak 1.000 55.248 56.248
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
272.9449 -42.0446 0.1075 28.4 -156.0 1.1382 1.8 TRIG_00344485
------------------------------------------
Foreground time interval of the image:
-8.752 61.248 (delta_t = 70.000 [sec])
Background time interval of the image:
-128.251 -72.648 (delta_t = 55.603 [sec])
-60.752 -8.752 (delta_t = 52.000 [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 -8.752 sec. to 61.248 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48184 ( -0.364401 0.378169 )
Norm@50keV : 1.18535E-03 ( -0.000266537 0.000256021 )
------------------------------------------------------------
# Chi-Squared = 45.32 using 59 PHA bins.
# Reduced chi-squared = 0.7951 for 57 degrees of freedom
# Null hypothesis probability = 8.676258e-01
Photon flux (15-150 keV) in 70 sec: 0.147267 ( -0.0282275 0.0282365 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.89523e-07 ( -1.95542e-07 2.07112e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.752 sec. to 61.248 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48689 ( -0.37282 0.373738 )
Epeak [keV] : 9999.33 ( -9912.86 -9912.86 )
Norm@50keV : 1.18596E-03 ( -0.00026626 0.00489517 )
------------------------------------------------------------
# Chi-Squared = 45.33 using 59 PHA bins.
# Reduced chi-squared = 0.8094 for 56 degrees of freedom
# Null hypothesis probability = 8.453130e-01
Photon flux (15-150 keV) in 70 sec: 0.147207 ( -0.028218 0.028224 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.75698e-07 ( -1.82786e-07 2.212e-07 ) ergs/cm2
Band function
Time interval is from -8.752 sec. to 61.248 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.51315 ( -5.83755 -5.83755 )
beta : -1.79274 ( -0.533863 0.509104 )
Epeak [keV] : 28.4689 ( -18.1932 8.31937 )
Norm@50keV : 28.0762 ( -28.0689 6.74113 )
------------------------------------------------------------
# Chi-Squared = 43.78 using 59 PHA bins.
# Reduced chi-squared = 0.7960 for 55 degrees of freedom
# Null hypothesis probability = 8.616850e-01
Photon flux (15-150 keV) in 70 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 55.248 sec. to 56.248 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23518 ( -1.75568 2.03701 )
Norm@50keV : 3.19933E-03 ( -0.00319934 0.00238387 )
------------------------------------------------------------
# Chi-Squared = 40.93 using 59 PHA bins.
# Reduced chi-squared = 0.7180 for 57 degrees of freedom
# Null hypothesis probability = 9.465117e-01
Photon flux (15-150 keV) in 1 sec: 0.377502 ( -0.272663 0.272788 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.21462e-08 ( -2.59474e-08 3.08853e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 55.248 sec. to 56.248 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.99407 ( )
Epeak [keV] : 44.5657 ( -11.4876 204.688 )
Norm@50keV : 4187.85 ( -3963.84 84823.5 )
------------------------------------------------------------
# Chi-Squared = 40.16 using 59 PHA bins.
# Reduced chi-squared = 0.7171 for 56 degrees of freedom
# Null hypothesis probability = 9.455013e-01
Photon flux (15-150 keV) in 1 sec: 0.273380 ( -0.184916 0.335212 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.77294e-08 ( -1.21252e-08 1.4961e-08 ) ergs/cm2
Band function
Time interval is from 55.248 sec. to 56.248 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99894 ( -1810.99 -1810.99 )
beta : -2.70541 ( 2.70767 2.70767 )
Epeak [keV] : 46.9277 ( -46.6672 38.126 )
Norm@50keV : 8.24170 ( -8.56582 5.58735e+06 )
------------------------------------------------------------
# Chi-Squared = 40.40 using 59 PHA bins.
# Reduced chi-squared = 0.7346 for 55 degrees of freedom
# Null hypothesis probability = 9.296570e-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] : ( )
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:
Fri Jun 3 13:04:16 EDT 2011