batgrbproduct Analysis for Trigger=441015
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 Dec 28 11:59:23 EST 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger441015/batgroup_hand_proc
======================================================================
Trigger: 00441015 Segment: 000
BAT Trigger Time: 314995072 [s; MET]
Trigger Stop: 314996160 [s; MET]
UTC: 2010-12-25T18:37:45.500280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 0.234180491347238 Dec: 44.6016240751001 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.06
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.06
Flight Position: [ source = EXTERNAL ]
RA: 0.2076 Dec: 44.5749 [deg; J2000]
Partial Coding Fraction: 0.859375 [ including projection effects ]
Angular difference between Flight and Ground position is 0.000000 arcmin
Partial Coding Fraction: 0.859375 [ including projection effects ]
Duration
T90: 1088 +/-
Measured from: 0
to: 1088 [s; relative to TRIGTIME]
T50: 1088 +/-
Measured from: 0
to: 1088 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1088 second)
Measured from: 0
to: 1088 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1088 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.158377 1.089655 0.870299 0.087427
0.187138 0.195255 0.181140 0.178277 [error]
Peak 1.158377 1.089655 0.870299 0.087427
0.187138 0.195255 0.181140 0.178277 [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 3.48e-07 4.97e-07 5.27e-07 1.03e-06 1.69e-06 2.41e-06 erg/cm2
Error 8.37e-08 9.01e-08 1.73e-07 6.75e-07 3.95e-07 8.70e-07 erg/cm2
Peak flux Power-law 1.18e-02 9.28e-03 4.93e-03 3.80e-03 2.77e-02 2.98e-02 ph/cm2/s
Error 2.90e-03 1.66e-03 1.56e-03 2.30e-03 4.90e-03 5.52e-03 ph/cm2/s
Fluence Cutoff-PL 3.45e-07 5.07e-07 5.21e-07 7.39e-07 1.66e-06 2.11e-06 erg/cm2
Error 8.68e-08 1.08e-07 1.91e-07 9.15e-07 4.39e-07 1.06e-06 erg/cm2
Peak flux Cutoff-PL 1.17e-02 9.47e-03 4.89e-03 2.91e-03 2.75e-02 2.89e-02 ph/cm2/s
Error 3.01e-03 1.98e-03 1.68e-03 6.48e-03 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 1.915 0.348 - - 1.92e-04 4.56e-05 50.920 57
CPL 1.830 0.000 75.0 0.0 2.18e-04 0.00e+00 50.870 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 1.915 0.348 - - 1.92e-04 4.56e-05 50.920 57
CPL 1.830 0.000 75.0 0.0 2.18e-04 0.00e+00 50.870 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 1088.000 0.000 1088.000
T90 1088.000 0.000 1088.000
T50 1088.000 0.000 1088.000
Peak 1088.000 0.000 1088.000
Image
Pre-slew 15.0-50.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
0.2076 44.5749 0.0264 22.8596 -40.2423 2.2953100 7.297 TRIG_00441015
Foreground time interval of the image:
0.000 201.120 (delta_t = 201.120 [sec])
202.000 203.150 (delta_t = 1.150 [sec])
204.000 204.621 (delta_t = 0.620 [sec])
206.000 950.000 (delta_t = 744.000 [sec])
Background time interval of the image:
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
0.000000 201.120000
202.000000 203.150000
204.000000 204.620500
206.000000 963.063800
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91463 ( -0.331797 0.364046 )
Norm@50keV : 1.91884E-04 ( -4.65049e-05 4.46867e-05 )
------------------------------------------------------------
# Chi-Squared = 50.92 using 59 PHA bins.
# Reduced chi-squared = 0.8933 for 57 degrees of freedom
# Null hypothesis probability = 7.013786e-01
Photon flux (15-150 keV) in 960 sec: 2.77099E-02 ( -0.00489936 0.00490046 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69385e-06 ( -3.84542e-07 4.06081e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.000000 201.120000
202.000000 203.150000
204.000000 204.620500
206.000000 963.063800
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82995 ( )
Epeak [keV] : 75.0014 ( )
Norm@50keV : 2.18219E-04 ( )
------------------------------------------------------------
# Chi-Squared = 50.87 using 59 PHA bins.
# Reduced chi-squared = 0.9083 for 56 degrees of freedom
# Null hypothesis probability = 6.690497e-01
Photon flux (15-150 keV) in 960 sec: 2.75440E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65807e-06 ( -4.41638e-07 4.3705e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.000000 201.120000
202.000000 203.150000
204.000000 204.620500
206.000000 963.063800
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99616 ( -499.955 -499.955 )
beta : -2.15920 ( -0.777719 0.406351 )
Epeak [keV] : 23.3181 ( -23.3008 5.06311 )
Norm@50keV : 48.2206 ( -33.6986 113.384 )
------------------------------------------------------------
# Chi-Squared = 49.18 using 59 PHA bins.
# Reduced chi-squared = 0.8942 for 55 degrees of freedom
# Null hypothesis probability = 6.954248e-01
Photon flux (15-150 keV) in 960 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 206.000 sec. to 963.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91463 ( -0.331797 0.364046 )
Norm@50keV : 1.91884E-04 ( -4.65049e-05 4.46867e-05 )
------------------------------------------------------------
# Chi-Squared = 50.92 using 59 PHA bins.
# Reduced chi-squared = 0.8933 for 57 degrees of freedom
# Null hypothesis probability = 7.013786e-01
Photon flux (15-150 keV) in 960 sec: 2.77099E-02 ( -0.00489936 0.00490046 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69385e-06 ( -3.84542e-07 4.06081e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 206.000 sec. to 963.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82995 ( )
Epeak [keV] : 75.0014 ( )
Norm@50keV : 2.18219E-04 ( )
------------------------------------------------------------
# Chi-Squared = 50.87 using 59 PHA bins.
# Reduced chi-squared = 0.9083 for 56 degrees of freedom
# Null hypothesis probability = 6.690497e-01
Photon flux (15-150 keV) in 960 sec: 2.75440E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.65807e-06 ( -4.41638e-07 4.3705e-07 ) ergs/cm2
Band function
Time interval is from 206.000 sec. to 963.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99616 ( -499.955 -499.955 )
beta : -2.15920 ( -0.777719 0.406351 )
Epeak [keV] : 23.3181 ( -23.3008 5.06311 )
Norm@50keV : 48.2206 ( -33.6986 113.384 )
------------------------------------------------------------
# Chi-Squared = 49.18 using 59 PHA bins.
# Reduced chi-squared = 0.8942 for 55 degrees of freedom
# Null hypothesis probability = 6.954248e-01
Photon flux (15-150 keV) in 960 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 Dec 28 13:57:47 EST 2010