Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done using the HEASARC data.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.48
Process Start Time: Wed Jun 14 15:09:44 EDT 2023
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1161127
======================================================================
Trigger: 01161127 Segment: 000
BAT Trigger Time: 701212268.864 [s; MET]
Trigger Stop: 701212269.888 [s; MET]
UTC: 2023-03-22T21:10:37.893100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 16.5654750906929 Dec: -47.7287211073544 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9
Image Trigger?: NO
Rate S/N Ratio: 11.6189500386223 [ if not an image trigger ]
Image S/N Ratio: 9
Analysis Position: [ source = BAT ]
RA: 16.5654750906929 Dec: -47.7287211073544 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 16.5534535346927 Dec: -47.7114460390152 [deg; J2000]
{ 01h 06m 12.8s , -47d 42' 41.2" }
+/- 1.70920067666722 [arcmin] (estimated 90% radius based on SNR)
+/- 0.592656105743296 [arcmin] (formal 1-sigma fit error)
SNR: 14.1434992348981
Angular difference between the analysis and refined position is 1.144470 arcmin
Partial Coding Fraction: 0.921875 [ including projection effects ]
Duration
T90: 11.7999999523163 +/- 2.29129222285299
Measured from: -2.25199997425079
to: 9.54799997806549 [s; relative to TRIGTIME]
T50: 5.23599994182587 +/- 1.7227792020921
Measured from: -0.851999998092651
to: 4.38399994373322 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0199999809265137
to: 1.01999998092651 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.07199990749359
to: 11.3200000524521 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.309115 0.275266 0.136267 0.034166
0.030832 0.031452 0.026602 0.023834 [error]
Peak 0.052799 0.051388 0.019281 0.003892
0.008651 0.008876 0.007411 0.006022 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 14.392 -3.072 11.320
T90 11.800 -2.252 9.548
T50 5.236 -0.852 4.384
Peak 1.000 0.020 1.020
====== Spectral Analysis Summary =====================================
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^{Ph_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 both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedo
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: PL)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -2.103 -0.273 0.251 - - - 2.83e-03 -4.95e-04 4.75e-04 49.320 57
CPL -1.994 -0.026 0.513 4.849 N/A N/A 3.11e-03 N/A N/A 49.670 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: N/A)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -2.144 -0.389 0.340 - - - 6.64e-03 -1.80e-03 1.74e-03 73.460 57
CPL -0.458 -1.547 2.248 36.759 -32.458 16.325 6.59e-02 -6.59e-02 1.32e+00 70.380 56
=== 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 PL 9.19e-08 1.17e-07 1.09e-07 1.78e-07 3.78e-07 4.96e-07 erg/cm2
90%_error_low -1.58e-08 -1.47e-08 -2.59e-08 -7.20e-08 -5.75e-08 -1.04e-07 erg/cm2
90%_error_hi 1.62e-08 1.46e-08 2.68e-08 9.94e-08 5.92e-08 1.25e-07 erg/cm2
Peak flux PL 5.09e-01 3.51e-01 1.59e-01 1.00e-01 1.07e+00 1.12e+00 ph/cm2/s
90%_error_low -1.27e-01 -7.03e-02 -5.37e-02 -5.16e-02 -2.08e-01 -2.21e-01 ph/cm2/s
90%_error_hi 1.32e-01 6.98e-02 5.63e-02 7.60e-02 2.08e-01 2.22e-01 ph/cm2/s
Fluence CPL 8.92e-08 9.76e-08 1.06e-07 1.16e-07 3.83e-07 4.95e-07 erg/cm2
90%_error_low -1.76e-08 -4.40e-08 -1.62e-08 -3.33e-08 -6.19e-08 -3.15e-07 erg/cm2
90%_error_hi 1.75e-08 3.07e-08 2.97e-08 1.83e-07 6.40e-08 1.43e-07 erg/cm2
Peak flux CPL 4.43e-01 4.24e-01 1.50e-01 1.58e-02 1.03e+00 1.03e+00 ph/cm2/s
90%_error_low -1.54e-01 -9.92e-02 -6.66e-02 -1.58e-02 -2.08e-01 -2.09e-01 ph/cm2/s
90%_error_hi 1.52e-01 1.03e-01 6.76e-02 8.11e-02 2.09e-01 2.13e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 16.5535 -47.7114 0.0136 25.1025 -17.1819 0.8424297 14.143 TRIG_01161127 Foreground time interval of the image: -3.072 11.320 (delta_t = 14.392 [sec]) Background time interval of the image: -239.864 -3.072 (delta_t = 236.792 [sec])
Light Curves
Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.
Full-time range; 1 s binning
Other quick-look light curves:
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using 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.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -3.072 sec. to 11.320 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.10335 ( -0.272778 0.251012 ) Norm@50keV : 2.82832E-03 ( -0.000495423 0.000475503 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 49.32 using 59 bins. Reduced chi-squared = 0.865263 # Null hypothesis probability of 7.55e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 14.39 sec: 0.445744 ( -0.054118 0.054129 ) ph/cm2/s Energy fluence (15-150 keV) : 3.7833e-07 ( -5.75256e-08 5.92429e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.072 sec. to 11.320 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.2217 ( -0.0260408 0.512639 ) Epeak [keV] : 94.7499 ( ) Norm@50keV : 2.35289E-03 ( ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 48.76 using 59 bins. Reduced chi-squared = 0.870714 # Null hypothesis probability of 7.43e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 14.39 sec: 0.392704 ( -0.11046 0.097471 ) ph/cm2/s Energy fluence (15-150 keV) : 3.8295e-07 ( -6.19454e-08 6.39818e-08 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.020 sec. to 1.020 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -2.14401 ( -0.388553 0.339978 ) Norm@50keV : 6.63864E-03 ( -0.00179891 0.00174122 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 73.46 using 59 bins. Reduced chi-squared = 1.28877 # Null hypothesis probability of 7.01e-02 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.06780 ( -0.208043 0.20804 ) ph/cm2/s Energy fluence (15-150 keV) : 6.19812e-08 ( -1.45461e-08 1.51464e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.020 sec. to 1.020 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -0.4576 ( -1.54763 2.24824 ) Epeak [keV] : 36.7594 ( -32.4586 16.3248 ) Norm@50keV : 6.58539E-02 ( -0.0658794 1.31726 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 70.38 using 59 bins. Reduced chi-squared = 1.25679 # Null hypothesis probability of 9.36e-02 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 1.03042 ( -0.208087 0.20947 ) ph/cm2/s Energy fluence (15-150 keV) : 5.57905e-08 ( -1.30066e-08 1.52474e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = 11.8 sec. Hardness ratio (energy fluence ratio) = 0.930872263799
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = 2.0902263e-07 S(50-150 keV) = 1.6930487e-07
The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.
Mask shadow pattern
IMX = 4.475793670390039E-01, IMY = 1.383939603464624E-01
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image: -239.864000 -3.072000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 285.0974 -24.8729 6.0 48.5 146.1 4.4416 1.9 4.4 HT1900.1-2455 297.5562 -65.3667 2.2 31.6 84.6 3.3533 5.3 ------ UNKNOWN 352.8010 -5.6289 3.4 40.0 -109.0 3.9520 3.4 547.8 UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -3.072000 11.320000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 284.9192 -25.0299 3.7 48.5 145.8 0.7853 3.1 9.1 HT1900.1-2455 16.5535 -47.7115 0.8 25.1 -17.2 0.8425 14.2 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 96.036590 962.270700 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 61.5099 -71.7626 2.6 31.6 84.6 9.2889 4.4 ------ UNKNOWN 54.7385 -5.6128 3.6 53.2 -20.3 10.0316 3.2 ------ UNKNOWN