batgrbproduct Analysis for Trigger=436737
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): Thu Oct 21 20:43:17 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger436737/GCN5_download_cron
======================================================================
Trigger: 00436737 Segment: 000
BAT Trigger Time: 309310848 [s; MET]
Trigger Stop: 309310912 [s; MET]
UTC: 2010-10-20T23:40:41.709060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 189.566423306271 Dec: 23.1609361221947 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 13.24
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 13.24
Flight Position: [ source = BAT ]
RA: 189.566423306271 Dec: 23.1609361221947 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 189.576065134489 Dec: 23.1829695168702 [deg; J2000]
{ 12h 38m 18.3s , +23d 10' 58.7" }
+/- 1.75072551148911 [arcmin] (estimated 90% radius based on SNR)
+/- 0.754152539600761 [arcmin] (formal 1-sigma fit error)
SNR: 13.6667109153265
Angular difference between Flight and Ground position is 1.424973 arcmin
Partial Coding Fraction: 0.4296875 [ including projection effects ]
Duration
T90: 177.27999997139 +/- 31.6106230191437
Measured from: -33.1119998693466
to: 144.168000102043 [s; relative to TRIGTIME]
T50: 72.9599999785423 +/- 20.0519517197784
Measured from: -1.7519998550415
to: 71.2080001235008 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -15.339999973774
to: -14.339999973774 [s; relative to TRIGTIME]
Total Fluence
Measured from: -44.055999994278
to: 161.448000013828 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.610398 1.867484 0.777396 0.260866
0.131245 0.129570 0.117754 0.112453 [error]
Peak 0.022336 0.018966 0.028289 0.011457
0.009132 0.009029 0.007991 0.007506 [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 6.06e-07 7.92e-07 7.60e-07 1.30e-06 2.59e-06 3.45e-06 erg/cm2
Error 7.71e-08 6.80e-08 1.16e-07 3.96e-07 2.62e-07 5.17e-07 erg/cm2
Peak flux Power-law 1.87e-01 1.92e-01 1.39e-01 1.61e-01 5.80e-01 6.78e-01 ph/cm2/s
Error 1.29e-01 8.17e-02 6.66e-02 1.66e-01 2.30e-01 2.62e-01 ph/cm2/s
Fluence Cutoff-PL 5.84e-07 8.26e-07 7.45e-07 7.68e-07 2.52e-06 2.81e-06 erg/cm2
Error 8.76e-08 9.31e-08 1.31e-07 7.31e-07 3.15e-07 8.39e-07 erg/cm2
Peak flux Cutoff-PL 1.03e-01 1.89e-01 1.74e-01 1.21e-01 6.10e-01 5.47e-01 ph/cm2/s
Error 1.59e-01 1.44e-01 1.08e-01 4.60e-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 6.03e-01 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 2.060 0.171 - - 1.36e-03 1.48e-04 62.930 57
CPL 1.663 0.642 35.5 0.0 2.30e-03 0.00e+00 62.140 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 1.467 0.744 - - 4.69e-03 1.83e-03 60.900 57
CPL -1.583 0.000 75.6 432.4 6.50e-02 0.00e+00 60.490 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 205.504 -44.056 161.448
T90 177.280 -33.112 144.168
T50 72.960 -1.752 71.208
Peak 1.000 -15.340 -14.340
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
189.5761 +23.1830 0.0141 39.2 -41.9 4.8880 13.7 TRIG_00436737
------------------------------------------
Foreground time interval of the image:
-44.056 161.448 (delta_t = 205.504 [sec])
Background time interval of the image:
-239.000 -44.056 (delta_t = 194.944 [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 -44.056 sec. to 161.448 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.06044 ( -0.167476 0.175318 )
Norm@50keV : 1.36021E-03 ( -0.000149857 0.000146794 )
------------------------------------------------------------
# Chi-Squared = 62.93 using 59 PHA bins.
# Reduced chi-squared = 1.104 for 57 degrees of freedom
# Null hypothesis probability = 2.745071e-01
Photon flux (15-150 keV) in 205.5 sec: 0.209913 ( -0.0181607 0.0181794 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.58803e-06 ( -2.59341e-07 2.63848e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -44.056 sec. to 161.448 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66297 ( -0.838739 0.445207 )
Epeak [keV] : 35.4543 ( )
Norm@50keV : 2.29649E-03 ( )
------------------------------------------------------------
# Chi-Squared = 62.14 using 59 PHA bins.
# Reduced chi-squared = 1.110 for 56 degrees of freedom
# Null hypothesis probability = 2.668450e-01
Photon flux (15-150 keV) in 205.5 sec: 0.205963 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.51604e-06 ( -3.17251e-07 3.12257e-07 ) ergs/cm2
Band function
Time interval is from -44.056 sec. to 161.448 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.33276 ( 1.33066 2.97058 )
beta : -2.30164 ( 2.30253 0.352225 )
Epeak [keV] : 33.6935 ( -33.8127 21.9557 )
Norm@50keV : 3.79118E-03 ( -0.00382376 8.49134 )
------------------------------------------------------------
# Chi-Squared = 61.38 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 55 degrees of freedom
# Null hypothesis probability = 2.580717e-01
Photon flux (15-150 keV) in 205.5 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 -15.340 sec. to -14.340 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46722 ( -0.703206 0.784748 )
Norm@50keV : 4.68789E-03 ( -0.00184995 0.00180302 )
------------------------------------------------------------
# Chi-Squared = 60.90 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 57 degrees of freedom
# Null hypothesis probability = 3.373063e-01
Photon flux (15-150 keV) in 1 sec: 0.580235 ( -0.22854 0.231203 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.4721e-08 ( -1.86347e-08 1.90278e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.340 sec. to -14.340 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.58334 ( )
Epeak [keV] : 75.6125 ( -51.4598 813.435 )
Norm@50keV : 6.49994E-02 ( )
------------------------------------------------------------
# Chi-Squared = 60.49 using 59 PHA bins.
# Reduced chi-squared = 1.080 for 56 degrees of freedom
# Null hypothesis probability = 3.169256e-01
Photon flux (15-150 keV) in 1 sec: 0.609715 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.63118e-08 ( -1.83995e-08 1.92416e-08 ) ergs/cm2
Band function
Time interval is from -15.340 sec. to -14.340 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.290408 ( -2.54862 0.858595 )
beta : -10.00000 ( 1.23925e+11 1.23925e+11 )
Epeak [keV] : 80.9447 ( -59.7821 -79.8855 )
Norm@50keV : 2.38109E-02 ( -0.0284455 1.39864 )
------------------------------------------------------------
# Chi-Squared = 60.47 using 59 PHA bins.
# Reduced chi-squared = 1.099 for 55 degrees of freedom
# Null hypothesis probability = 2.850376e-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 Oct 21 21:38:25 EDT 2010