batgrbproduct Analysis for Trigger=445414
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): Sun Feb 13 19:40:18 EST 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger445414/GCN5_download_cron
======================================================================
Trigger: 00445414 Segment: 000
BAT Trigger Time: 319267056.192 [s; MET]
Trigger Stop: 319267057.216 [s; MET]
UTC: 2011-02-13T05:17:29.533120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 43.0039088785786 Dec: 49.2914056374636 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.08
Image Trigger?: NO
Rate S/N Ratio: 32.6802692767364 [ if not an image trigger ]
Image S/N Ratio: 12.08
Flight Position: [ source = BAT ]
RA: 43.0039088785786 Dec: 49.2914056374636 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 42.9784826901303 Dec: 49.27817843599 [deg; J2000]
{ 02h 51m 54.8s , +49d 16' 41.4" }
+/- 1.44088595258117 [arcmin] (estimated 90% radius based on SNR)
+/- 0.665715312050204 [arcmin] (formal 1-sigma fit error)
SNR: 18.0511408588739
Angular difference between Flight and Ground position is 1.272845 arcmin
Partial Coding Fraction: 0.05810547 [ including projection effects ]
Duration
T90: 48 +/- 16
Measured from: -31.1919998526573
to: 16.8080001473427 [s; relative to TRIGTIME]
T50: 16 +/- 16
Measured from: -15.1919998526573
to: 0.808000147342682 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.30800002813339
to: 9.30800002813339 [s; relative to TRIGTIME]
Total Fluence
Measured from: -31.1919999718666
to: 32.8080000281334 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.823104 3.432035 2.158222 0.538640
0.179494 0.187445 0.166106 0.136578 [error]
Peak 0.070539 0.080650 0.041887 0.003859
0.023535 0.023711 0.019962 0.016770 [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 1.11e-06 1.67e-06 1.88e-06 4.02e-06 5.87e-06 8.68e-06 erg/cm2
Error 1.18e-07 1.07e-07 1.70e-07 7.74e-07 3.98e-07 9.11e-07 erg/cm2
Peak flux Power-law 9.03e-01 4.71e-01 1.52e-01 6.35e-02 1.56e+00 1.59e+00 ph/cm2/s
Error 4.40e-01 1.97e-01 1.06e-01 8.35e-02 6.25e-01 6.32e-01 ph/cm2/s
Fluence Cutoff-PL 1.11e-06 1.67e-06 1.88e-06 3.99e-06 5.87e-06 8.65e-06 erg/cm2
Error 1.18e-07 1.07e-07 1.71e-07 7.68e-07 3.98e-07 9.06e-07 erg/cm2
Peak flux Cutoff-PL 7.89e-01 5.65e-01 1.75e-01 4.72e-01 1.05e+01 1.55e+00 ph/cm2/s
Error 6.52e-01 2.73e-01 1.15e-01 6.36e-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 1.57e+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 1.828 0.117 - - 9.96e-03 6.66e-04 59.170 57
CPL 1.827 0.227 9999.0 0.0 9.97e-03 0.00e+00 59.180 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 2.627 0.790 - - 7.34e-03 4.14e-03 45.620 57
CPL 1.339 0.000 23.7 0.0 3.83e-02 0.00e+00 44.960 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: 28.288000 sec.
T50 in the 50-300 keV band: 5.184000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 64.000 -31.192 32.808
T90 48.000 -31.192 16.808
T50 16.000 -15.192 0.808
Peak 1.000 8.308 9.308
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
42.9785 +49.2782 0.0106 48.5 38.5 8.8682 18.1 TRIG_00445414
------------------------------------------
Foreground time interval of the image:
-31.192 11.609 (delta_t = 42.801 [sec])
Background time interval of the image:
-145.791 -31.192 (delta_t = 114.599 [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 -31.192 sec. to 32.808 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82759 ( -0.116143 0.118492 )
Norm@50keV : 9.96388E-03 ( -0.000669011 0.000663225 )
------------------------------------------------------------
# Chi-Squared = 59.17 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 57 degrees of freedom
# Null hypothesis probability = 3.962144e-01
Photon flux (15-150 keV) in 64 sec: 1.38796 ( -0.0914179 0.0917911 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.86584e-06 ( -3.97222e-07 3.98941e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -31.192 sec. to 32.808 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82660 ( -0.335164 0.119288 )
Epeak [keV] : 9999.04 ( )
Norm@50keV : 9.97279E-03 ( )
------------------------------------------------------------
# Chi-Squared = 59.18 using 59 PHA bins.
# Reduced chi-squared = 1.057 for 56 degrees of freedom
# Null hypothesis probability = 3.604416e-01
Photon flux (15-150 keV) in 64 sec: 1.38735 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.86639e-06 ( -3.97344e-07 3.99053e-07 ) ergs/cm2
Band function
Time interval is from -31.192 sec. to 32.808 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.78171 ( 1.60227 1.60227 )
beta : -1.83549 ( -0.118563 0.116106 )
Epeak [keV] : 184.836 ( -15.4942 -15.4942 )
Norm@50keV : 1.05947E-02 ( -0.00126636 1.1302 )
------------------------------------------------------------
# Chi-Squared = 59.16 using 59 PHA bins.
# Reduced chi-squared = 1.076 for 55 degrees of freedom
# Null hypothesis probability = 3.263488e-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] : ( )
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 8.308 sec. to 9.308 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.62748 ( -0.626803 0.952541 )
Norm@50keV : 7.33775E-03 ( -0.0043193 0.00397014 )
------------------------------------------------------------
# Chi-Squared = 45.62 using 59 PHA bins.
# Reduced chi-squared = 0.8003 for 57 degrees of freedom
# Null hypothesis probability = 8.606547e-01
Photon flux (15-150 keV) in 1 sec: 1.56187 ( -0.624468 0.625325 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.61906e-08 ( -3.26342e-08 3.32202e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.308 sec. to 9.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33876 ( )
Epeak [keV] : 23.6933 ( )
Norm@50keV : 3.83357E-02 ( )
------------------------------------------------------------
# Chi-Squared = 44.96 using 59 PHA bins.
# Reduced chi-squared = 0.8029 for 56 degrees of freedom
# Null hypothesis probability = 8.545653e-01
Photon flux (15-150 keV) in 1 sec: 10.4867 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.55749e-07 ( -8.0511e-08 8.1164e-08 ) ergs/cm2
Band function
Time interval is from 8.308 sec. to 9.308 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.49402 ( 1.49402 1.7351 )
beta : -9.35618 ( 9.97925 19.9793 )
Epeak [keV] : 20.3377 ( -20.3377 32.223 )
Norm@50keV : 3.19429E-02 ( -0.0319429 192783 )
------------------------------------------------------------
# Chi-Squared = 44.97 using 59 PHA bins.
# Reduced chi-squared = 0.8177 for 55 degrees of freedom
# Null hypothesis probability = 8.306250e-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:
Sun Feb 13 20:09:08 EST 2011