batgrbproduct Analysis for Trigger=436094
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 Oct 12 02:11:49 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger436094/GCN5_download_cron
======================================================================
Trigger: 00436094 Segment: 000
BAT Trigger Time: 308509121.6 [s; MET]
Trigger Stop: 308509122.624 [s; MET]
UTC: 2010-10-11T16:58:35.338240 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 48.2984265172764 Dec: -65.9859644209653 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.65
Image Trigger?: NO
Rate S/N Ratio: 24.7991935352745 [ if not an image trigger ]
Image S/N Ratio: 6.65
Flight Position: [ source = BAT ]
RA: 48.2984265172764 Dec: -65.9859644209653 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 48.27336392433 Dec: -65.9894394576057 [deg; J2000]
{ 03h 13m 05.6s , -65d 59' 22.0" }
+/- 1.22658307788658 [arcmin] (estimated 90% radius based on SNR)
+/- 0.514985657053858 [arcmin] (formal 1-sigma fit error)
SNR: 22.7200051013293
Angular difference between Flight and Ground position is 0.646474 arcmin
Partial Coding Fraction: 0.875 [ including projection effects ]
Duration
T90: 70.9839999675751 +/- 18.5808904171171
Measured from: 0.388000071048737
to: 71.3720000386238 [s; relative to TRIGTIME]
T50: 24.379999935627 +/- 5.3572369716253
Measured from: 4.4080001115799
to: 28.7880000472069 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.224000036716461
to: 0.775999963283539 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.379999995231628
to: 87.0719999670982 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.486397 0.715941 0.634362 0.288451
0.050400 0.052066 0.047133 0.043239 [error]
Peak 0.036078 0.066442 0.049264 0.015223
0.006244 0.006646 0.006327 0.005628 [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 1.39e-07 2.98e-07 5.02e-07 1.93e-06 1.38e-06 2.87e-06 erg/cm2
Error 2.10e-08 2.59e-08 4.62e-08 4.17e-07 1.16e-07 4.42e-07 erg/cm2
Peak flux Power-law 3.72e-01 4.31e-01 3.58e-01 5.02e-01 1.34e+00 1.66e+00 ph/cm2/s
Error 7.41e-02 5.40e-02 4.99e-02 1.42e-01 1.55e-01 2.05e-01 ph/cm2/s
Fluence Cutoff-PL 1.39e-07 2.99e-07 5.03e-07 1.92e-06 1.38e-06 2.71e-06 erg/cm2
Error 2.10e-08 2.60e-08 4.63e-08 4.14e-07 1.16e-07 5.90e-07 erg/cm2
Peak flux Cutoff-PL 3.30e-01 4.67e-01 3.78e-01 2.12e-01 1.31e+00 1.39e+00 ph/cm2/s
Error 8.58e-02 6.97e-02 5.72e-02 2.68e-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 1.249 0.142 - - 1.58e-03 1.18e-04 51.630 57
CPL 1.245 0.153 10000.0 0.0 1.58e-03 1.18e-04 51.670 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 1.265 0.189 - - 1.13e-02 1.31e-03 57.160 57
CPL 0.496 0.823 95.1 -31.8 2.84e-02 4.61e-02 54.540 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: 35.584000 sec.
T50 in the 50-300 keV band: 21.056000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 87.452 -0.380 87.072
T90 70.984 0.388 71.372
T50 24.380 4.408 28.788
Peak 1.000 -0.224 0.776
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
48.2734 -65.9894 0.0084 25.1 2.6 1.0887 22.7 TRIG_00436094
------------------------------------------
Foreground time interval of the image:
-0.380 16.701 (delta_t = 17.081 [sec])
Background time interval of the image:
-239.600 -0.380 (delta_t = 239.220 [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 -0.380 sec. to 87.072 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24856 ( -0.143094 0.141348 )
Norm@50keV : 1.57696E-03 ( -0.000117669 0.000117668 )
------------------------------------------------------------
# Chi-Squared = 51.63 using 59 PHA bins.
# Reduced chi-squared = 0.9057 for 57 degrees of freedom
# Null hypothesis probability = 6.762260e-01
Photon flux (15-150 keV) in 87.45 sec: 0.186468 ( -0.0144982 0.0145566 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38067e-06 ( -1.15173e-07 1.15876e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.380 sec. to 87.072 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24476 ( -0.174579 0.131735 )
Epeak [keV] : 10000.00 ( )
Norm@50keV : 1.58398E-03 ( -0.000118218 0.000118212 )
------------------------------------------------------------
# Chi-Squared = 51.67 using 59 PHA bins.
# Reduced chi-squared = 0.9226 for 56 degrees of freedom
# Null hypothesis probability = 6.394468e-01
Photon flux (15-150 keV) in 87.45 sec: 0.186391 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.38077e-06 ( -1.15215e-07 1.15932e-07 ) ergs/cm2
Band function
Time interval is from -0.380 sec. to 87.072 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.996898 ( 0.99707 0.99707 )
beta : -1.24821 ( 1.24836 0.143024 )
Epeak [keV] : 52.3831 ( -52.1653 -52.1653 )
Norm@50keV : 2.83793E-03 ( -0.00138032 0.497776 )
------------------------------------------------------------
# Chi-Squared = 51.63 using 59 PHA bins.
# Reduced chi-squared = 0.9386 for 55 degrees of freedom
# Null hypothesis probability = 6.043601e-01
Photon flux (15-150 keV) in 87.45 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 -0.224 sec. to 0.776 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.26472 ( -0.189991 0.188775 )
Norm@50keV : 1.13217E-02 ( -0.00130973 0.00130717 )
------------------------------------------------------------
# Chi-Squared = 57.16 using 59 PHA bins.
# Reduced chi-squared = 1.003 for 57 degrees of freedom
# Null hypothesis probability = 4.692261e-01
Photon flux (15-150 keV) in 1 sec: 1.34232 ( -0.154993 0.155095 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12873e-07 ( -1.47253e-08 1.49105e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.224 sec. to 0.776 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.495987 ( -0.862126 0.784593 )
Epeak [keV] : 95.0914 ( -31.472 -95.104 )
Norm@50keV : 2.84148E-02 ( -0.0223083 0.0698717 )
------------------------------------------------------------
# Chi-Squared = 54.54 using 59 PHA bins.
# Reduced chi-squared = 0.9739 for 56 degrees of freedom
# Null hypothesis probability = 5.304463e-01
Photon flux (15-150 keV) in 1 sec: 1.30585 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05247e-07 ( -1.74094e-08 1.7202e-08 ) ergs/cm2
Band function
Time interval is from -0.224 sec. to 0.776 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.31525 ( -2.02183 -1.45486 )
beta : -1.65405 ( -0.552558 0.373484 )
Epeak [keV] : 41.6977 ( -14.8923 55.417 )
Norm@50keV : 1.92447 ( -1.9204 58.9337 )
------------------------------------------------------------
# Chi-Squared = 51.31 using 59 PHA bins.
# Reduced chi-squared = 0.9329 for 55 degrees of freedom
# Null hypothesis probability = 6.164320e-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:
Tue Oct 12 02:34:32 EDT 2010