batgrbproduct Analysis for Trigger=435903
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): Sat Oct 9 20:40:28 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger435903/SDC
======================================================================
Trigger: 00435903 Segment: 000
BAT Trigger Time: 308249001.472 [s; MET]
Trigger Stop: 308249002.496 [s; MET]
UTC: 2010-10-08T16:43:15.219700 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 328.890606987462 Dec: 37.0622663135631 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.7
Image Trigger?: NO
Rate S/N Ratio: 21.1660104885167 [ if not an image trigger ]
Image S/N Ratio: 10.7
Flight Position: [ source = BAT ]
RA: 328.890606987462 Dec: 37.0622663135631 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 328.882423555896 Dec: 37.0601244966465 [deg; J2000]
{ 21h 55m 31.8s , +37d 03' 36.4" }
+/- 2.14952401391138 [arcmin] (estimated 90% radius based on SNR)
+/- 0.897621340441718 [arcmin] (formal 1-sigma fit error)
SNR: 10.1939773393227
Angular difference between Flight and Ground position is 0.412355 arcmin
Partial Coding Fraction: 0.5859375 [ including projection effects ]
Duration
T90: 104.271999955177 +/- 34.6032657524036
Measured from: -2.40399998426437
to: 101.867999970913 [s; relative to TRIGTIME]
T50: 40.4759999513626 +/- 22.2792064652318
Measured from: 0.412000000476837
to: 40.8879999518394 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.424000024795532
to: 0.575999975204468 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4
to: 106.620000004768 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.542212 0.588150 0.512838 0.163090
0.077654 0.077697 0.070182 0.063992 [error]
Peak 0.043318 0.064443 0.060271 0.036731
0.007997 0.008753 0.007994 0.007038 [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 1.68e-07 2.92e-07 3.87e-07 1.04e-06 1.13e-06 1.89e-06 erg/cm2
Error 3.76e-08 3.94e-08 7.02e-08 4.11e-07 1.66e-07 4.65e-07 erg/cm2
Peak flux Power-law 4.19e-01 5.05e-01 4.40e-01 6.57e-01 1.59e+00 2.02e+00 ph/cm2/s
Error 1.11e-01 7.99e-02 6.54e-02 2.17e-01 2.15e-01 2.75e-01 ph/cm2/s
Fluence Cutoff-PL 1.68e-07 2.92e-07 3.87e-07 1.04e-06 1.13e-06 1.75e-06 erg/cm2
Error 3.76e-08 3.94e-08 7.03e-08 4.08e-07 1.66e-07 6.75e-07 erg/cm2
Peak flux Cutoff-PL 4.18e-01 5.05e-01 4.40e-01 6.52e-01 1.59e+00 2.02e+00 ph/cm2/s
Error 1.11e-01 7.99e-02 6.55e-02 2.74e-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 1.594 0.240 - - 1.09e-03 1.48e-04 51.110 57
CPL 2.288 0.000 105.9 0.0 4.64e-04 0.00e+00 51.080 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 1.198 0.240 - - 1.36e-02 1.76e-03 64.070 57
CPL 2.031 0.000 11.7 0.0 3.61e-03 0.00e+00 62.840 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: 8.064000 sec.
T50 in the 50-300 keV band: 4.544000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 110.620 -4.000 106.620
T90 104.272 -2.404 101.868
T50 40.476 0.412 40.888
Peak 1.000 -0.424 0.576
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
328.8824 +37.0601 0.0189 39.7 -162.7 1.8473 10.2 TRIG_00435903
------------------------------------------
Foreground time interval of the image:
-4.000 106.620 (delta_t = 110.620 [sec])
Background time interval of the image:
-210.971 -4.000 (delta_t = 206.971 [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 -4.000 sec. to 106.620 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59403 ( -0.236961 0.243501 )
Norm@50keV : 1.09041E-03 ( -0.000149289 0.000147311 )
------------------------------------------------------------
# Chi-Squared = 51.11 using 59 PHA bins.
# Reduced chi-squared = 0.8966 for 57 degrees of freedom
# Null hypothesis probability = 6.947343e-01
Photon flux (15-150 keV) in 110.6 sec: 0.139865 ( -0.0186317 0.0186908 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12867e-06 ( -1.65336e-07 1.67309e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.000 sec. to 106.620 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.28780 ( )
Epeak [keV] : 105.858 ( )
Norm@50keV : 4.63661E-04 ( )
------------------------------------------------------------
# Chi-Squared = 51.08 using 59 PHA bins.
# Reduced chi-squared = 0.9121 for 56 degrees of freedom
# Null hypothesis probability = 6.612949e-01
Photon flux (15-150 keV) in 110.6 sec: 0.139812 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12884e-06 ( -1.6539e-07 1.6736e-07 ) ergs/cm2
Band function
Time interval is from -4.000 sec. to 106.620 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.29705 ( 1.30071 1.30071 )
beta : -1.58868 ( 1.59126 0.234386 )
Epeak [keV] : 40.2830 ( -37.8657 -37.8657 )
Norm@50keV : 2.01487E-03 ( -0.00203294 0.112904 )
------------------------------------------------------------
# Chi-Squared = 51.11 using 59 PHA bins.
# Reduced chi-squared = 0.9293 for 55 degrees of freedom
# Null hypothesis probability = 6.239698e-01
Photon flux (15-150 keV) in 110.6 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 -0.424 sec. to 0.576 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19811 ( -0.243436 0.237271 )
Norm@50keV : 1.35828E-02 ( -0.00175796 0.00175546 )
------------------------------------------------------------
# Chi-Squared = 64.07 using 59 PHA bins.
# Reduced chi-squared = 1.124 for 57 degrees of freedom
# Null hypothesis probability = 2.424261e-01
Photon flux (15-150 keV) in 1 sec: 1.59390 ( -0.214971 0.21584 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37877e-07 ( -1.9588e-08 1.96945e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.424 sec. to 0.576 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.03120 ( )
Epeak [keV] : 11.7197 ( )
Norm@50keV : 3.61427E-03 ( )
------------------------------------------------------------
# Chi-Squared = 62.84 using 59 PHA bins.
# Reduced chi-squared = 1.122 for 56 degrees of freedom
# Null hypothesis probability = 2.470401e-01
Photon flux (15-150 keV) in 1 sec: 1.59335 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.37899e-07 ( -1.9598e-08 1.9705e-08 ) ergs/cm2
Band function
Time interval is from -0.424 sec. to 0.576 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.957565 ( 0.957565 0.957565 )
beta : -1.19808 ( 1.19808 0.243778 )
Epeak [keV] : 48.8791 ( -48.8787 -48.8787 )
Norm@50keV : 2.47174E-02 ( -0.012016 7405.04 )
------------------------------------------------------------
# Chi-Squared = 64.07 using 59 PHA bins.
# Reduced chi-squared = 1.165 for 55 degrees of freedom
# Null hypothesis probability = 1.882982e-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:
Sat Oct 9 23:07:32 EDT 2010