batgrbproduct Analysis for Trigger=632995
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 Mar 1 18:33:15 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger632995/GCN5_download_cron
======================================================================
Trigger: 00632995 Segment: 000
BAT Trigger Time: 446864681.884 [s; MET]
Trigger Stop: 446864681.916 [s; MET]
UTC: 2015-03-01T01:04:28.634980 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 244.285852544314 Dec: -48.6970222502195 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 13.43
Image Trigger?: NO
Rate S/N Ratio: 43.5201102939779 [ if not an image trigger ]
Image S/N Ratio: 13.43
Flight Position: [ source = BAT ]
RA: 244.285852544314 Dec: -48.6970222502195 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 244.281410056756 Dec: -48.7322656890402 [deg; J2000]
{ 16h 17m 07.5s , -48d 43' 56.2" }
+/- 1.86296160532305 [arcmin] (estimated 90% radius based on SNR)
+/- 0.808584248395742 [arcmin] (formal 1-sigma fit error)
SNR: 12.5058381069883
Angular difference between Flight and Ground position is 2.121907 arcmin
Partial Coding Fraction: 0.9609375 [ including projection effects ]
Duration
T90: 0.483999967575073 +/- 0.144055479289884
Measured from: 1.19209289550781e-07
to: 0.484000086784363 [s; relative to TRIGTIME]
T50: 0.179999947547913 +/- 0.116068941971857
Measured from: 0.00800013542175293
to: 0.188000082969666 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.220000028610229
to: 0.779999971389771 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.560000002384186 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.036815 0.042293 0.032195 0.009602
0.005556 0.005310 0.004341 0.003607 [error]
Peak 0.039712 0.042451 0.029900 0.011151
0.007155 0.006623 0.005449 0.004676 [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 9.29e-09 1.77e-08 2.60e-08 8.21e-08 7.36e-08 1.35e-07 erg/cm2
Error 2.14e-09 2.40e-09 4.25e-09 3.01e-08 1.03e-08 3.29e-08 erg/cm2
Peak flux Power-law 3.42e-01 3.24e-01 2.13e-01 2.17e-01 9.68e-01 1.10e+00 ph/cm2/s
Error 9.22e-02 5.34e-02 4.58e-02 9.68e-02 1.55e-01 1.74e-01 ph/cm2/s
Fluence Cutoff-PL 9.24e-09 1.77e-08 2.59e-08 8.09e-08 7.32e-08 1.28e-07 erg/cm2
Error 2.17e-09 2.42e-09 4.24e-09 3.86e-08 7.79e-09 4.37e-08 erg/cm2
Peak flux Cutoff-PL 3.43e-01 3.24e-01 2.13e-01 2.14e-01 9.68e-01 1.09e+00 ph/cm2/s
Error 1.00e-01 5.88e-02 4.68e-02 1.63e-01 1.55e-01 1.72e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.442 0.232 - - 1.37e-02 1.73e-03 54.100 57
CPL 1.448 0.282 9999.4 0.0 1.37e-02 1.23e-02 54.110 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.605 0.291 - - 7.52e-03 1.25e-03 46.670 57
CPL 1.603 1.185 9996.5 0.0 7.54e-03 1.26e-02 46.670 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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.560 0.000 0.560
T90 0.484 0.000 0.484
T50 0.180 0.008 0.188
Peak 1.000 -0.220 0.780
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
244.2814 -48.7323 0.0154 16.1 21.7 0.1242 12.5 TRIG_00632995
------------------------------------------
Foreground time interval of the image:
0.000 0.560 (delta_t = 0.560 [sec])
Background time interval of the image:
-209.884 -209.184 (delta_t = 0.700 [sec])
-206.884 -202.344 (delta_t = 4.540 [sec])
-200.884 -164.514 (delta_t = 36.370 [sec])
-163.884 -154.234 (delta_t = 9.650 [sec])
-152.884 0.000 (delta_t = 152.884 [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 0.000 sec. to 0.560 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44249 ( -0.232984 0.231084 )
Norm@50keV : 1.37188E-02 ( -0.00173413 0.00172711 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.10 using 59 PHA bins.
# Reduced chi-squared = 0.9491 for 57 degrees of freedom
# Null hypothesis probability = 5.845196e-01
Photon flux (15-150 keV) in 0.56 sec: 1.68753 ( -0.217963 0.218778 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.36187e-08 ( -1.02263e-08 1.03459e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.560 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.44850 ( -0.337614 0.226149 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.37174E-02 ( -0.0106758 0.0138994 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.11 using 59 PHA bins.
# Reduced chi-squared = 0.9663 for 56 degrees of freedom
# Null hypothesis probability = 5.465920e-01
Photon flux (15-150 keV) in 0.56 sec: 1.68973 ( -0.22073 0.2159 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.32329e-08 ( -4.99912e-09 1.05762e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.560 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.93025 ( -4.93025 -4.93025 )
beta : -1.48500 ( -0.259267 0.248845 )
Epeak [keV] : 22.0098 ( -22.0098 7.52499 )
Norm@50keV : 2678.35 ( -332.743 7.03709e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.73 using 59 PHA bins.
# Reduced chi-squared = 0.9770 for 55 degrees of freedom
# Null hypothesis probability = 5.230831e-01
Photon flux (15-150 keV) in 0.56 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] : 15.1087 (-2.50312 3.33597)
R^2/D10^2 : 0.181295 (-0.0903866 0.16417)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.66 using 59 PHA bins.
# Reduced chi-squared = 1.310 for 57 degrees of freedom
# Null hypothesis probability = 5.824897e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.846e-09 1.437e-09
25- 50 1.938e-08 3.928e-09
50-150 3.021e-08 7.851e-09
15-150 5.444e-08 1.053e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 6.93325 (-0.866458 0.866383)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.71 using 59 PHA bins.
# Reduced chi-squared = 0.9773 for 57 degrees of freedom
# Null hypothesis probability = 5.236866e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.669e-09 5.410e-09
25- 50 1.860e-08 1.026e-08
50-150 4.079e-08 2.267e-08
15-150 6.906e-08 3.777e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.18164 (-3.06001 1.74483)
R1^2/D10^2 : 1.17635 (-0.790621 4.71755)
kT2 [keV] : 44.2018 (-21.6529 -44.5438)
R2^2/D10^2 : 4.54662E-03 (-0.00424381 0.0189201)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.56 using 59 PHA bins.
# Reduced chi-squared = 0.9919 for 55 degrees of freedom
# Null hypothesis probability = 4.915415e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.700e-09 4.451e-09
25- 50 1.893e-08 8.822e-09
50-150 4.912e-08 2.698e-08
15-150 7.675e-08 3.607e-08
Peak spectrum fit
Power-law model
Time interval is from -0.220 sec. to 0.780 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60490 ( -0.288153 0.293203 )
Norm@50keV : 7.52202E-03 ( -0.0012621 0.00124047 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.67 using 59 PHA bins.
# Reduced chi-squared = 0.8189 for 57 degrees of freedom
# Null hypothesis probability = 8.337412e-01
Photon flux (15-150 keV) in 1 sec: 0.968087 ( -0.154784 0.155247 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.03055e-08 ( -1.25425e-08 1.27999e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.220 sec. to 0.780 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.60306 ( -1.10209 1.26826 )
Epeak [keV] : 9996.52 ( )
Norm@50keV : 7.53971E-03 ( -0.00126999 0.0238799 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.67 using 59 PHA bins.
# Reduced chi-squared = 0.8335 for 56 degrees of freedom
# Null hypothesis probability = 8.082476e-01
Photon flux (15-150 keV) in 1 sec: 0.968114 ( -0.154844 0.154716 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.02383e-08 ( -1.43244e-08 1.27334e-08 ) ergs/cm2
Band function
Time interval is from -0.220 sec. to 0.780 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.64927 ( -4.64927 -4.64927 )
beta : -1.67778 ( -0.352478 0.319686 )
Epeak [keV] : 22.8721 ( -22.8721 8.5736 )
Norm@50keV : 819.233 ( -127.916 5.72116e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.24 using 59 PHA bins.
# Reduced chi-squared = 0.8408 for 55 degrees of freedom
# Null hypothesis probability = 7.937597e-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] : 12.8314 (-2.45103 3.27404)
R^2/D10^2 : 0.182180 (-0.102766 0.215484)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.73 using 59 PHA bins.
# Reduced chi-squared = 1.013 for 57 degrees of freedom
# Null hypothesis probability = 4.480096e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.362e-09 2.007e-09
25- 50 2.160e-08 5.950e-09
50-150 2.231e-08 8.140e-09
15-150 5.028e-08 1.267e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 173.821 (-92.0933 -173.966)
Norm : 3.94253 (-0.646518 0.870451)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.99 using 59 PHA bins.
# Reduced chi-squared = 0.8244 for 57 degrees of freedom
# Null hypothesis probability = 8.252019e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.981e-09 5.620e-09
25- 50 1.888e-08 1.039e-08
50-150 3.947e-08 2.262e-08
15-150 6.833e-08 3.893e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.75538 (-3.29701 3.55305)
R1^2/D10^2 : 0.861636 (-0.608027 5.00337)
kT2 [keV] : 36.6866 (-32.5613 -37.0391)
R2^2/D10^2 : 3.71213E-03 (-0.00329047 0.0451625)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.67 using 59 PHA bins.
# Reduced chi-squared = 0.8485 for 55 degrees of freedom
# Null hypothesis probability = 7.806019e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.834e-09 5.635e-09
25- 50 1.971e-08 1.064e-08
50-150 4.251e-08 2.420e-08
15-150 7.205e-08 3.693e-08
Plot creation:
Sun Mar 1 18:38:26 EST 2015