batgrbproduct Analysis for Trigger=434178
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): Wed Sep 15 17:29:59 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger434178/GCN5_download_cron
======================================================================
Trigger: 00434178 Segment: 000
BAT Trigger Time: 306207072 [s; MET]
Trigger Stop: 306207136 [s; MET]
UTC: 2010-09-15T01:31:05.822060 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 315.648430088771 Dec: 65.6666778587913 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.67
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.67
Flight Position: [ source = BAT ]
RA: 315.648430088771 Dec: 65.6666778587913 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 315.664074439866 Dec: 65.6757044461074 [deg; J2000]
{ 21h 02m 39.4s , +65d 40' 32.5" }
+/- 1.97862149948311 [arcmin] (estimated 90% radius based on SNR)
+/- 1.00167046921787 [arcmin] (formal 1-sigma fit error)
SNR: 11.4747454547591
Angular difference between Flight and Ground position is 0.665481 arcmin
Partial Coding Fraction: 0.546875 [ including projection effects ]
Duration
T90: 200.311999976635 +/- 30.7987433238743
Measured from: -29.175999879837
to: 171.136000096798 [s; relative to TRIGTIME]
T50: 70.4079999923706 +/- 50.2711478372112
Measured from: -5.63199990987778
to: 64.7760000824928 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.75999999046326
to: 9.75999999046326 [s; relative to TRIGTIME]
Total Fluence
Measured from: -36.3040000200272
to: 190.083999991417 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.741929 0.819656 0.719310 0.320595
0.092153 0.094559 0.084391 0.075646 [error]
Peak 0.024688 0.006938 0.019917 0.014585
0.006886 0.007055 0.006518 0.005847 [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 2.05e-07 3.76e-07 5.31e-07 1.58e-06 1.52e-06 2.69e-06 erg/cm2
Error 4.39e-08 4.54e-08 8.75e-08 5.97e-07 2.04e-07 6.55e-07 erg/cm2
Peak flux Power-law 2.80e-01 1.45e-01 8.11e-02 1.13e-02 1.77e-03 4.06e-01 ph/cm2/s
Error 1.47e-01 7.16e-02 9.84e-02 2.58e-01 3.56e-01 0.00e+00 ph/cm2/s
Fluence Cutoff-PL 2.05e-07 3.76e-07 5.32e-07 1.57e-06 1.52e-06 2.68e-06 erg/cm2
Error 4.40e-08 4.54e-08 8.77e-08 5.92e-07 2.04e-07 6.50e-07 erg/cm2
Peak flux Cutoff-PL 2.92e-01 1.33e-01 3.50e-02 1.02e-02 4.66e-01 4.83e-01 ph/cm2/s
Error 1.47e-01 1.11e-01 7.15e-02 2.81e-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 1.501 0.234 - - 7.10e-04 8.43e-05 72.830 57
CPL 2.688 0.000 218.4 0.0 1.91e-04 0.00e+00 66.430 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 3.286 0.000 - - 1.30e-03 2.43e-03 73.040 57
CPL 7.718 0.000 766.8 0.0 6.77e-06 0.00e+00 60.540 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: 52.992000 sec.
T50 in the 50-300 keV band: 26.304000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 226.388 -36.304 190.084
T90 200.312 -29.176 171.136
T50 70.408 -5.632 64.776
Peak 1.000 8.760 9.760
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
315.6641 +65.6757 0.0168 26.9 -103.7 1.9677 11.5 TRIG_00434178
------------------------------------------
Foreground time interval of the image:
-36.304 38.130 (delta_t = 74.434 [sec])
39.000 72.201 (delta_t = 33.201 [sec])
Background time interval of the image:
-239.000 -56.336 (delta_t = 182.664 [sec])
-55.000 -36.304 (delta_t = 18.696 [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
Multiple GTIs in the spectrum
tstart tstop
-36.304000 38.130000
39.000000 190.084000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50053 ( -0.23232 0.236293 )
Norm@50keV : 7.10471E-04 ( -8.49112e-05 8.3626e-05 )
------------------------------------------------------------
# Chi-Squared = 72.83 using 59 PHA bins.
# Reduced chi-squared = 1.278 for 57 degrees of freedom
# Null hypothesis probability = 7.703828e-02
Photon flux (15-150 keV) in 225.5 sec: 8.87076E-02 ( -0.0103274 0.0103572 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51971e-06 ( -2.02994e-07 2.055e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-36.304000 38.130000
39.000000 190.084000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.68781 ( )
Epeak [keV] : 218.381 ( )
Norm@50keV : 1.90664E-04 ( )
------------------------------------------------------------
# Chi-Squared = 66.43 using 59 PHA bins.
# Reduced chi-squared = 1.186 for 56 degrees of freedom
# Null hypothesis probability = 1.604798e-01
Photon flux (15-150 keV) in 225.5 sec: 8.86635E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51961e-06 ( -2.03056e-07 2.05582e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-36.304000 38.130000
39.000000 190.084000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.25440 ( 1.2544 1.2544 )
beta : -1.50050 ( -0.236126 0.232511 )
Epeak [keV] : 18.6294 ( -18.6294 -18.6294 )
Norm@50keV : 1.52206E-03 ( -0.00152205 4473.6 )
------------------------------------------------------------
# Chi-Squared = 72.83 using 59 PHA bins.
# Reduced chi-squared = 1.324 for 55 degrees of freedom
# Null hypothesis probability = 5.403943e-02
Photon flux (15-150 keV) in 225.5 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 8.760 sec. to 9.760 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.28590 ( )
Norm@50keV : 1.30008E-03 ( -0.00130008 0.00355512 )
------------------------------------------------------------
# Chi-Squared = 73.04 using 59 PHA bins.
# Reduced chi-squared = 1.281 for 57 degrees of freedom
# Null hypothesis probability = 7.471012e-02
Photon flux (15-150 keV) in 1 sec: 0.406255 ( -0.257935 0.258653 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.49303e-08 ( -1.49389e-08 3.08898e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.760 sec. to 9.760 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 7.71837 ( )
Epeak [keV] : 766.770 ( )
Norm@50keV : 6.76695E-06 ( )
------------------------------------------------------------
# Chi-Squared = 60.54 using 59 PHA bins.
# Reduced chi-squared = 1.081 for 56 degrees of freedom
# Null hypothesis probability = 3.153948e-01
Photon flux (15-150 keV) in 1 sec: 0.465603 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.10145e-08 ( -2.10145e-08 2.47812e-08 ) ergs/cm2
Band function
Time interval is from 8.760 sec. to 9.760 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.78849 ( 2.29959 6.58726 )
beta : -3.28920 ( -6.27449 2.08057 )
Epeak [keV] : 411.444 ( -411.444 -411.444 )
Norm@50keV : 0.176155 ( -0.175913 0.483713 )
------------------------------------------------------------
# Chi-Squared = 73.04 using 59 PHA bins.
# Reduced chi-squared = 1.328 for 55 degrees of freedom
# Null hypothesis probability = 5.228375e-02
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:
Wed Sep 15 17:52:03 EDT 2010