batgrbproduct Analysis for Trigger=440606
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): Sun Dec 19 09:20:17 EST 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger440606/GCN5_download_cron
======================================================================
Trigger: 00440606 Segment: 000
BAT Trigger Time: 314418696.236 [s; MET]
Trigger Stop: 314418696.3 [s; MET]
UTC: 2010-12-19T02:31:29.757600 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 74.6157044200633 Dec: -2.53400569829485 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.15
Image Trigger?: NO
Rate S/N Ratio: 102.946588093049 [ if not an image trigger ]
Image S/N Ratio: 11.15
Flight Position: [ source = BAT ]
RA: 74.6157044200633 Dec: -2.53400569829485 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 74.5868284853806 Dec: -2.52669392284292 [deg; J2000]
{ 04h 58m 20.8s , -02d 31' 36.1" }
+/- 0.970770489102654 [arcmin] (estimated 90% radius based on SNR)
+/- 0.296500094071092 [arcmin] (formal 1-sigma fit error)
SNR: 31.7338881260554
Angular difference between Flight and Ground position is 1.785599 arcmin
Partial Coding Fraction: 0.9453125 [ including projection effects ]
Duration
T90: 0.827999949455261 +/- 0.180399565294848
Measured from: 0.00400012731552124
to: 0.832000076770782 [s; relative to TRIGTIME]
T50: 0.411999940872192 +/- 0.030463099373373
Measured from: 0.080000102519989
to: 0.492000043392181 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.015999972820282
to: 0.984000027179718 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.015999972820282
to: 1.10799998044968 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.080561 0.162120 0.207798 0.096327
0.007457 0.009018 0.009537 0.008420 [error]
Peak 0.078222 0.154854 0.202742 0.097279
0.007195 0.008751 0.009360 0.008292 [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 1.95e-08 6.15e-08 1.59e-07 1.19e-06 4.34e-07 1.43e-06 erg/cm2
Error 2.41e-09 4.43e-09 8.70e-09 1.64e-07 2.49e-08 1.66e-07 erg/cm2
Peak flux Power-law 5.82e-01 1.00e+00 1.32e+00 3.54e+00 3.87e+00 6.45e+00 ph/cm2/s
Error 7.45e-02 7.64e-02 7.11e-02 4.51e-01 2.04e-01 4.54e-01 ph/cm2/s
Fluence Cutoff-PL 1.94e-08 6.15e-08 1.60e-07 1.18e-06 4.34e-07 1.42e-06 erg/cm2
Error 2.41e-09 4.44e-09 8.71e-09 1.62e-07 2.49e-08 1.65e-07 erg/cm2
Peak flux Cutoff-PL 5.81e-01 1.00e+00 1.32e+00 3.52e+00 3.87e+00 6.43e+00 ph/cm2/s
Error 7.45e-02 7.65e-02 7.11e-02 4.51e-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 0.626 0.100 - - 3.05e-02 1.70e-03 65.640 57
CPL 0.621 0.101 9999.4 0.0 3.08e-02 4.43e-03 65.710 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 0.603 0.101 - - 3.31e-02 1.87e-03 67.890 57
CPL 0.600 0.102 9999.4 0.0 3.34e-02 4.46e-03 67.990 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: 0.512000 sec.
T50 in the 50-300 keV band: 0.320000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.124 -0.016 1.108
T90 0.828 0.004 0.832
T50 0.412 0.080 0.492
Peak 1.000 -0.016 0.984
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
74.5868 -2.5267 0.0061 14.3 32.9 0.5960 31.7 TRIG_00440606
------------------------------------------
Foreground time interval of the image:
-0.016 1.108 (delta_t = 1.124 [sec])
Background time interval of the image:
-97.935 -52.476 (delta_t = 45.459 [sec])
-52.236 -0.016 (delta_t = 52.220 [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 -0.016 sec. to 1.108 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.625664 ( -0.100979 0.0984164 )
Norm@50keV : 3.05444E-02 ( -0.00170897 0.00169371 )
------------------------------------------------------------
# Chi-Squared = 65.64 using 59 PHA bins.
# Reduced chi-squared = 1.152 for 57 degrees of freedom
# Null hypothesis probability = 2.022705e-01
Photon flux (15-150 keV) in 1.124 sec: 3.55561 ( -0.186286 0.186515 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.33702e-07 ( -2.48111e-08 2.49644e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.016 sec. to 1.108 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.621472 ( -0.105454 0.0958017 )
Epeak [keV] : 9999.36 ( -9989.53 -9989.53 )
Norm@50keV : 3.07913E-02 ( -0.00162277 0.00724607 )
------------------------------------------------------------
# Chi-Squared = 65.71 using 59 PHA bins.
# Reduced chi-squared = 1.173 for 56 degrees of freedom
# Null hypothesis probability = 1.757206e-01
Photon flux (15-150 keV) in 1.124 sec: 3.55469 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.33844e-07 ( -2.4828e-08 2.49831e-08 ) ergs/cm2
Band function
Time interval is from -0.016 sec. to 1.108 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99998 ( -125560 -125560 )
beta : -0.646768 ( -0.0982445 0.101438 )
Epeak [keV] : 26.2718 ( -26.2718 7.4504 )
Norm@50keV : 1112.35 ( -829.957 1.92615e+06 )
------------------------------------------------------------
# Chi-Squared = 64.94 using 59 PHA bins.
# Reduced chi-squared = 1.181 for 55 degrees of freedom
# Null hypothesis probability = 1.688943e-01
Photon flux (15-150 keV) in 1.124 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 -0.016 sec. to 0.984 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.602834 ( -0.102471 0.0997816 )
Norm@50keV : 3.31481E-02 ( -0.00188047 0.00186238 )
------------------------------------------------------------
# Chi-Squared = 67.89 using 59 PHA bins.
# Reduced chi-squared = 1.191 for 57 degrees of freedom
# Null hypothesis probability = 1.530719e-01
Photon flux (15-150 keV) in 1 sec: 3.86891 ( -0.204173 0.204398 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.23321e-07 ( -2.44599e-08 2.46069e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.016 sec. to 0.984 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.599676 ( -0.108049 0.0963701 )
Epeak [keV] : 9999.36 ( -9999.96 -9999.96 )
Norm@50keV : 3.34228E-02 ( -0.00178534 0.00714172 )
------------------------------------------------------------
# Chi-Squared = 67.99 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 56 degrees of freedom
# Null hypothesis probability = 1.308297e-01
Photon flux (15-150 keV) in 1 sec: 3.86790 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.23463e-07 ( -2.4476e-08 2.4627e-08 ) ergs/cm2
Band function
Time interval is from -0.016 sec. to 0.984 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.889681 ( 0.889681 0.889681 )
beta : -0.602836 ( -0.0997164 0.102605 )
Epeak [keV] : 16.2529 ( -16.2529 -16.2529 )
Norm@50keV : 4.63654E-02 ( -0.0128202 614299 )
------------------------------------------------------------
# Chi-Squared = 67.89 using 59 PHA bins.
# Reduced chi-squared = 1.234 for 55 degrees of freedom
# Null hypothesis probability = 1.136820e-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:
Sun Dec 19 09:40:22 EST 2010