batgrbproduct Analysis for Trigger=416115
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 10 16:26:51 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger416115/SDC
======================================================================
Trigger: 00416115 Segment: 000
BAT Trigger Time: 290422685.12 [s; MET]
Trigger Stop: 290422689.216 [s; MET]
UTC: 2010-03-16T08:57:59.501360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 32.2910617778291 Dec: -68.0089406869357 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.19
Image Trigger?: NO
Rate S/N Ratio: 11.0905365064094 [ if not an image trigger ]
Image S/N Ratio: 7.19
Flight Position: [ source = BAT ]
RA: 32.2910617778291 Dec: -68.0089406869357 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 32.3239087737488 Dec: -67.984855893856 [deg; J2000]
{ 02h 09m 17.7s , -67d 59' 05.5" }
+/- 1.89850531363113 [arcmin] (estimated 90% radius based on SNR)
+/- 0.817035569555632 [arcmin] (formal 1-sigma fit error)
SNR: 12.1727082408467
Angular difference between Flight and Ground position is 1.622801 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 9.26399993896484 +/- 1.89068455984379
Measured from: -2.65600001811981
to: 6.60799992084503 [s; relative to TRIGTIME]
T50: 3.99599993228912 +/- 1.42225172512656
Measured from: -0.11599999666214
to: 3.87999993562698 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.11599999666214
to: 3.11599999666214 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.02799999713898
to: 6.90399998426437 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.100672 0.108373 0.083273 0.036359
0.014928 0.014996 0.013347 0.011845 [error]
Peak 0.013660 0.014550 0.017217 0.009902
0.004775 0.004922 0.004181 0.003816 [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 2.67e-08 4.54e-08 5.88e-08 1.54e-07 1.73e-07 2.85e-07 erg/cm2
Error 5.97e-09 6.47e-09 1.28e-08 7.05e-08 3.01e-08 8.21e-08 erg/cm2
Peak flux Power-law 7.51e-02 1.09e-01 1.18e-01 2.37e-01 3.75e-01 5.39e-01 ph/cm2/s
Error 4.87e-02 4.22e-02 3.23e-02 1.63e-01 1.06e-01 1.63e-01 ph/cm2/s
Fluence Cutoff-PL 2.65e-08 4.58e-08 5.90e-08 1.36e-07 1.72e-07 2.47e-07 erg/cm2
Error 6.47e-09 7.66e-09 1.31e-08 1.18e-07 3.25e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 7.56e-02 1.09e-01 1.18e-01 2.35e-01 3.76e-01 5.32e-01 ph/cm2/s
Error 4.93e-02 4.21e-02 3.26e-02 1.06e-01 2.04e-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 1.626 0.264 - - 1.87e-03 2.98e-04 50.840 57
CPL 1.558 1.100 303.8 0.0 2.03e-03 3.00e-03 50.830 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 0.889 0.551 - - 3.26e-03 9.39e-04 70.060 57
CPL 0.895 0.675 9999.4 0.0 3.28e-03 1.39e-02 70.070 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: 8.064000 sec.
T50 in the 50-300 keV band: 3.328000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 9.932 -3.028 6.904
T90 9.264 -2.656 6.608
T50 3.996 -0.116 3.880
Peak 1.000 2.116 3.116
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
32.3239 -67.9849 0.0158 6.8 -4.4 0.3401 12.2 TRIG_00416115
------------------------------------------
Foreground time interval of the image:
-3.028 6.904 (delta_t = 9.932 [sec])
Background time interval of the image:
-239.120 -3.028 (delta_t = 236.092 [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 -3.028 sec. to 6.904 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62636 ( -0.258741 0.270062 )
Norm@50keV : 1.86886E-03 ( -0.00030186 0.000293969 )
------------------------------------------------------------
# Chi-Squared = 50.84 using 59 PHA bins.
# Reduced chi-squared = 0.8920 for 57 degrees of freedom
# Null hypothesis probability = 7.039389e-01
Photon flux (15-150 keV) in 9.932 sec: 0.242159 ( -0.0344386 0.0344508 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.73059e-07 ( -2.97103e-08 3.045e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.028 sec. to 6.904 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55841 ( -1.08585 1.11326 )
Epeak [keV] : 303.794 ( -303.776 -303.776 )
Norm@50keV : 2.03293E-03 ( -0.000463159 0.00553989 )
------------------------------------------------------------
# Chi-Squared = 50.83 using 59 PHA bins.
# Reduced chi-squared = 0.9076 for 56 degrees of freedom
# Null hypothesis probability = 6.704223e-01
Photon flux (15-150 keV) in 9.932 sec: 0.241432 ( -0.035742 0.03499 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.71989e-07 ( -3.35255e-08 3.14129e-08 ) ergs/cm2
Band function
Time interval is from -3.028 sec. to 6.904 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.48485 ( 1.48533 0.455084 )
beta : -1.81350 ( 2.05478 3.03967 )
Epeak [keV] : 179.624 ( -187.838 -187.838 )
Norm@50keV : 2.20903E-03 ( -0.000617603 0.00561597 )
------------------------------------------------------------
# Chi-Squared = 50.84 using 59 PHA bins.
# Reduced chi-squared = 0.9244 for 55 degrees of freedom
# Null hypothesis probability = 6.341702e-01
Photon flux (15-150 keV) in 9.932 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 2.116 sec. to 3.116 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.888508 ( -0.592722 0.508764 )
Norm@50keV : 3.26498E-03 ( -0.000968533 0.000909084 )
------------------------------------------------------------
# Chi-Squared = 70.06 using 59 PHA bins.
# Reduced chi-squared = 1.229 for 57 degrees of freedom
# Null hypothesis probability = 1.147506e-01
Photon flux (15-150 keV) in 1 sec: 0.374709 ( -0.105494 0.106795 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.6806e-08 ( -1.02517e-08 1.03473e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.116 sec. to 3.116 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.895232 ( -0.848259 0.501098 )
Epeak [keV] : 9999.36 ( -9994.44 -9994.44 )
Norm@50keV : 3.28436E-03 ( -0.000878402 0.0269033 )
------------------------------------------------------------
# Chi-Squared = 70.07 using 59 PHA bins.
# Reduced chi-squared = 1.251 for 56 degrees of freedom
# Null hypothesis probability = 9.791947e-02
Photon flux (15-150 keV) in 1 sec: 0.376462 ( -0.10724 0.104931 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 2.116 sec. to 3.116 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.835308 ( 0.835086 0.835086 )
beta : -0.920111 ( -0.480023 0.624369 )
Epeak [keV] : 14.1005 ( -13.8744 -13.8744 )
Norm@50keV : 4.97764E-03 ( -0.00283689 0 )
------------------------------------------------------------
# Chi-Squared = 70.07 using 59 PHA bins.
# Reduced chi-squared = 1.274 for 55 degrees of freedom
# Null hypothesis probability = 8.298155e-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:
Thu May 26 14:02:20 EDT 2011