batgrbproduct Analysis for Trigger=412220
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 13:08:39 EDT 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger412220/SDC
======================================================================
Trigger: 00412220 Segment: 000
BAT Trigger Time: 287794719.744 [s; MET]
Trigger Stop: 287794723.84 [s; MET]
UTC: 2010-02-13T22:58:34.216240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 124.337626580859 Dec: 43.4552068987612 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.85
Image Trigger?: NO
Rate S/N Ratio: 11.1803398874989 [ if not an image trigger ]
Image S/N Ratio: 10.85
Flight Position: [ source = BAT ]
RA: 124.337626580859 Dec: 43.4552068987612 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 124.317096148308 Dec: 43.4647895965918 [deg; J2000]
{ 08h 17m 16.1s , +43d 27' 53.2" }
+/- 1.25386732699136 [arcmin] (estimated 90% radius based on SNR)
+/- 0.545637499965257 [arcmin] (formal 1-sigma fit error)
SNR: 22.0170420432024
Angular difference between Flight and Ground position is 1.063035 arcmin
Partial Coding Fraction: 0.5625 [ including projection effects ]
Duration
T90: 96 +/- 32
Measured from: -15.744000017643
to: 80.255999982357 [s; relative to TRIGTIME]
T50: 16 +/- 16
Measured from: 0.255999982357025
to: 16.255999982357 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 7.75599998235703
to: 8.75599998235703 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.744000017643
to: 112.255999982357 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.102320 0.827037 0.346110 0.080395
0.066667 0.066189 0.058482 0.050953 [error]
Peak 0.026441 0.021483 0.009095 -0.002996
0.006626 0.006928 0.005948 0.004955 [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 3.57e-07 3.82e-07 2.90e-07 3.58e-07 1.17e-06 1.39e-06 erg/cm2
Error 3.96e-08 3.45e-08 5.17e-08 1.21e-07 1.19e-07 1.90e-07 erg/cm2
Peak flux Power-law 2.57e-01 1.70e-01 7.33e-02 4.33e-02 5.22e-01 5.44e-01 ph/cm2/s
Error 1.05e-01 5.86e-02 4.56e-02 5.57e-02 1.68e-01 1.79e-01 ph/cm2/s
Fluence Cutoff-PL 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 Cutoff-PL 2.39e-01 1.91e-01 7.37e-02 5.15e-01 5.18e-01 0.00e+00 ph/cm2/s
Error 1.23e-01 8.04e-02 1.67e-01 2.20e-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 2.398 0.180 - - 9.34e-04 1.21e-04 49.280 57
CPL 1.812 0.580 11.4 0.0 2.20e-03 0.00e+00 47.500 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 2.216 0.690 - - 3.13e-03 1.51e-03 57.390 57
CPL 1.321 2.316 31.8 0.0 1.04e-02 0.00e+00 57.010 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: 26.624000 sec.
T50 in the 50-300 keV band: 14.528000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 128.000 -15.744 112.256
T90 96.000 -15.744 80.256
T50 16.000 0.256 16.256
Peak 1.000 7.756 8.756
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
124.3171 +43.4648 0.0087 35.1 15.8 2.1539 22.0 TRIG_00412220
------------------------------------------
Foreground time interval of the image:
-15.744 34.957 (delta_t = 50.701 [sec])
Background time interval of the image:
-239.744 -15.744 (delta_t = 224.000 [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 -15.744 sec. to 112.256 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.39839 ( -0.17434 0.18501 )
Norm@50keV : 9.33605E-04 ( -0.000121456 0.00012014 )
------------------------------------------------------------
# Chi-Squared = 49.28 using 59 PHA bins.
# Reduced chi-squared = 0.8645 for 57 degrees of freedom
# Null hypothesis probability = 7.566147e-01
Photon flux (15-150 keV) in 128 sec: 0.172577 ( -0.0144821 0.0144851 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16527e-06 ( -1.17419e-07 1.20178e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.744 sec. to 112.256 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81190 ( -0.973976 0.185359 )
Epeak [keV] : 11.4488 ( )
Norm@50keV : 2.19521E-03 ( )
------------------------------------------------------------
# Chi-Squared = 47.50 using 59 PHA bins.
# Reduced chi-squared = 0.8482 for 56 degrees of freedom
# Null hypothesis probability = 7.835536e-01
Photon flux (15-150 keV) in 128 sec: 0.168785 ( -0.01518 0.015207 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -15.744 sec. to 112.256 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99202 ( -251.27 -241.27 )
beta : -2.68333 ( -0.178569 0.250559 )
Epeak [keV] : 21.7833 ( -3.03303 2.39899 )
Norm@50keV : 547.105 ( -279.204 664.308 )
------------------------------------------------------------
# Chi-Squared = 41.92 using 59 PHA bins.
# Reduced chi-squared = 0.7622 for 55 degrees of freedom
# Null hypothesis probability = 9.027960e-01
Photon flux (15-150 keV) in 128 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 7.756 sec. to 8.756 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.21595 ( -0.581429 0.797658 )
Norm@50keV : 3.12827E-03 ( -0.00156877 0.00145903 )
------------------------------------------------------------
# Chi-Squared = 57.39 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 57 degrees of freedom
# Null hypothesis probability = 4.607447e-01
Photon flux (15-150 keV) in 1 sec: 0.522278 ( -0.168157 0.168229 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.94798e-08 ( -1.17845e-08 1.26735e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.756 sec. to 8.756 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32131 ( -3.86864 0.762636 )
Epeak [keV] : 31.7716 ( )
Norm@50keV : 1.03980E-02 ( )
------------------------------------------------------------
# Chi-Squared = 57.01 using 59 PHA bins.
# Reduced chi-squared = 1.018 for 56 degrees of freedom
# Null hypothesis probability = 4.371788e-01
Photon flux (15-150 keV) in 1 sec: 0.515040 ( -0.167929 0.165285 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 7.756 sec. to 8.756 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.55991 ( 1.56001 2.86161 )
beta : -9.36832 ( 9.99768 19.9977 )
Epeak [keV] : 29.6438 ( -29.5091 -29.5091 )
Norm@50keV : 7.38329E-03 ( -0.00740139 3.65019e+06 )
------------------------------------------------------------
# Chi-Squared = 57.05 using 59 PHA bins.
# Reduced chi-squared = 1.037 for 55 degrees of freedom
# Null hypothesis probability = 3.989442e-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:
Thu May 26 14:26:06 EDT 2011