batgrbproduct Analysis for Trigger=430957
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 Aug 5 12:52:50 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger430957/GCN5_download_cron
======================================================================
Trigger: 00430957 Segment: 000
BAT Trigger Time: 302674368.32 [s; MET]
Trigger Stop: 302674376.512 [s; MET]
UTC: 2010-08-05T04:12:42.269380 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 299.874325084812 Dec: 52.6145212717446 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.08
Image Trigger?: NO
Rate S/N Ratio: 10.6301458127346 [ if not an image trigger ]
Image S/N Ratio: 7.08
Flight Position: [ source = BAT ]
RA: 299.874325084812 Dec: 52.6145212717446 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 299.845704919512 Dec: 52.6182268336755 [deg; J2000]
{ 19h 59m 23.0s , +52d 37' 05.6" }
+/- 2.04095911969644 [arcmin] (estimated 90% radius based on SNR)
+/- 0.924148967901046 [arcmin] (formal 1-sigma fit error)
SNR: 10.9773609086371
Angular difference between Flight and Ground position is 1.066045 arcmin
Partial Coding Fraction: 0.390625 [ including projection effects ]
Duration
T90: 16.6199999451637 +/- 3.00148294113658
Measured from: -0.107999861240387
to: 16.5120000839233 [s; relative to TRIGTIME]
T50: 8.76399993896484 +/- 1.86223955314083
Measured from: 2.9080001115799
to: 11.6720000505447 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.97200000286102
to: 2.97200000286102 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.35199999809265
to: 17.1079999804497 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.255998 0.311689 0.234332 0.018637
0.036003 0.036993 0.032797 0.028320 [error]
Peak 0.019790 0.037548 0.016519 0.013771
0.008502 0.008832 0.007798 0.006663 [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 8.94e-08 1.41e-07 1.67e-07 3.85e-07 5.09e-07 7.82e-07 erg/cm2
Error 1.80e-08 1.83e-08 3.22e-08 1.53e-07 7.58e-08 1.83e-07 erg/cm2
Peak flux Power-law 2.57e-01 2.37e-01 1.51e-01 1.48e-01 7.07e-01 7.93e-01 ph/cm2/s
Error 1.25e-01 7.56e-02 6.38e-02 1.26e-01 2.22e-01 2.49e-01 ph/cm2/s
Fluence Cutoff-PL 8.21e-08 1.50e-07 1.72e-07 1.72e-07 4.90e-07 5.76e-07 erg/cm2
Error 2.14e-08 2.33e-08 3.54e-08 2.53e-07 8.13e-08 2.29e-07 erg/cm2
Peak flux Cutoff-PL 2.25e-01 2.63e-01 1.57e-01 5.11e-02 6.82e-01 6.96e-01 ph/cm2/s
Error 1.89e-01 1.11e-01 7.74e-02 2.99e-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 1.754 0.232 - - 2.99e-03 4.28e-04 65.910 57
CPL 1.064 1.007 65.5 0.0 6.81e-03 0.00e+00 64.740 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 1.649 0.551 - - 5.42e-03 1.82e-03 57.220 57
CPL 0.680 4.295 62.4 0.0 1.81e-02 0.00e+00 56.830 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: 16.192000 sec.
T50 in the 50-300 keV band: 8.960000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 18.460 -1.352 17.108
T90 16.620 -0.108 16.512
T50 8.764 2.908 11.672
Peak 1.000 1.972 2.972
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
299.8457 +52.6182 0.0174 39.1 157.2 0.8080 11.0 TRIG_00430957
------------------------------------------
Foreground time interval of the image:
-1.352 17.108 (delta_t = 18.460 [sec])
Background time interval of the image:
-239.320 -1.352 (delta_t = 237.968 [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 -1.352 sec. to 17.108 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75351 ( -0.226689 0.237423 )
Norm@50keV : 2.98735E-03 ( -0.000432766 0.000424015 )
------------------------------------------------------------
# Chi-Squared = 65.91 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 57 degrees of freedom
# Null hypothesis probability = 1.958224e-01
Photon flux (15-150 keV) in 18.46 sec: 0.404465 ( -0.0530673 0.0531402 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.08758e-07 ( -7.52343e-08 7.63755e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.352 sec. to 17.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06397 ( -0.97399 1.03962 )
Epeak [keV] : 65.4640 ( )
Norm@50keV : 6.80833E-03 ( )
------------------------------------------------------------
# Chi-Squared = 64.74 using 59 PHA bins.
# Reduced chi-squared = 1.156 for 56 degrees of freedom
# Null hypothesis probability = 1.979459e-01
Photon flux (15-150 keV) in 18.46 sec: 0.394669 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.89515e-07 ( -7.98949e-08 8.26159e-08 ) ergs/cm2
Band function
Time interval is from -1.352 sec. to 17.108 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.18059 ( 1.22083 1.12729 )
beta : -10.00000 ( 1.20387e+11 1.20387e+11 )
Epeak [keV] : 68.9158 ( -23.1011 -68.8164 )
Norm@50keV : 5.94730E-03 ( -0.00596346 0.0149153 )
------------------------------------------------------------
# Chi-Squared = 64.71 using 59 PHA bins.
# Reduced chi-squared = 1.177 for 55 degrees of freedom
# Null hypothesis probability = 1.738225e-01
Photon flux (15-150 keV) in 18.46 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 1.972 sec. to 2.972 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64902 ( -0.529503 0.571991 )
Norm@50keV : 5.41601E-03 ( -0.00185331 0.00178222 )
------------------------------------------------------------
# Chi-Squared = 57.22 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 57 degrees of freedom
# Null hypothesis probability = 4.669732e-01
Photon flux (15-150 keV) in 1 sec: 0.706963 ( -0.221373 0.221898 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.03745e-08 ( -1.75364e-08 1.8149e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.972 sec. to 2.972 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.680189 ( -7.07977 1.51067 )
Epeak [keV] : 62.4484 ( )
Norm@50keV : 1.80878E-02 ( )
------------------------------------------------------------
# Chi-Squared = 56.83 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 56 degrees of freedom
# Null hypothesis probability = 4.438855e-01
Photon flux (15-150 keV) in 1 sec: 0.682128 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.6397e-08 ( -1.97075e-08 1.99246e-08 ) ergs/cm2
Band function
Time interval is from 1.972 sec. to 2.972 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.160627 ( 0.985367 0.985367 )
beta : -2.54394 ( 2.08522 2.11613 )
Epeak [keV] : 51.4945 ( -51.611 60.5674 )
Norm@50keV : 5.43685E-02 ( -0.0516065 74.4737 )
------------------------------------------------------------
# Chi-Squared = 56.54 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 55 degrees of freedom
# Null hypothesis probability = 4.171109e-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 Aug 5 13:08:18 EDT 2010