TDRSS lightcurve for Trigger=1500106
Notes:
- 1) None of the TDRSS light curves are background subtracted.
GCN BAT Position Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Thu 12 Mar 26 02:57:27 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 1500106, Seg_Num: 0
GRB_RA: 351.609d {+23h 26m 26s} (J2000),
351.946d {+23h 27m 47s} (current),
350.966d {+23h 23m 52s} (1950)
GRB_DEC: -3.533d {-03d 31' 59"} (J2000),
-3.389d {-03d 23' 19"} (current),
-3.808d {-03d 48' 30"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 2827 [cnts] Image_Peak=150 [image_cnts]
TRIGGER_DUR: 2.048 [sec]
TRIGGER_INDEX: 252 E_range: 15-25 keV
BKG_INTEN: 26934 [cnts]
BKG_TIME: 10586.62 SOD {02:56:26.62} UT
BKG_DUR: 24 [sec]
GRB_DATE: 21111 TJD; 71 DOY; 26/03/12
GRB_TIME: 10620.22 SOD {02:57:00.22} UT
GRB_PHI: -146.73 [deg]
GRB_THETA: 46.93 [deg]
SOLN_STATUS: 0x3
RATE_SIGNIF: 8.94 [sigma]
IMAGE_SIGNIF: 9.44 [sigma]
MERIT_PARAMS: +1 +0 +0 +1 +0 +0 -100 +0 -99 +0
SUN_POSTN: 352.23d {+23h 28m 56s} -3.35d {-03d 21' 05"}
SUN_DIST: 0.29 [deg] Sun_angle= 0.0 [hr] (West of Sun)
MOON_POSTN: 269.24d {+17h 56m 57s} -28.40d {-28d 23' 57"}
MOON_DIST: 81.98 [deg]
MOON_ILLUM: 43 [%]
GAL_COORDS: 78.53,-58.87 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 350.90, 0.08 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: SWIFT-BAT GRB Coordinates.
COMMENTS: This is a rate trigger.
COMMENTS: A point_source was found.
COMMENTS: This does not match any source in the on-board catalog.
COMMENTS: This does not match any source in the ground catalog.
COMMENTS: This is a GRB.
COMMENTS: This trigger occurred at longitude,latitude = 102.27,19.50 [deg].
GCN BAT Lightcurve Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Thu 12 Mar 26 03:14:41 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 1500106, Seg_Num: 0
GRB_RA: 351.609d {+23h 26m 26s} (J2000),
351.946d {+23h 27m 47s} (current),
350.966d {+23h 23m 52s} (1950)
GRB_DEC: -3.533d {-03d 31' 59"} (J2000),
-3.389d {-03d 23' 19"} (current),
-3.808d {-03d 48' 30"} (1950)
GRB_DATE: 21111 TJD; 71 DOY; 26/03/12
GRB_TIME: 10620.22 SOD {02:57:00.22} UT
TRIGGER_INDEX: 252
GRB_PHI: -146.73 [deg]
GRB_THETA: 46.93 [deg]
DELTA_TIME: 0.00 [sec]
TRIGGER_DUR: 2.048 [sec]
SOLN_STATUS: 0x3
RATE_SIGNIF: 8.94 [sigma]
IMAGE_SIGNIF: 9.44 [sigma]
LC_URL: sw01500106000msb.lc
GCN template for BAT paragraph
Click here!
At 02:57:00 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 260312 ***A*** (trigger=1500106). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 351.609, -3.533 which is
RA(J2000) = 23h 26m 26s
Dec(J2000) = -03d 31' 59"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a [**double-peaked**]
structure with a duration of about TTT sec. The peak count rate
was ~1118 counts/sec (15-350 keV), at ~5 sec after the trigger.
Test version of draft template
Initial TDRSS lightcurve and spacecraft attitude plot
TDRSS lightcurve from T0-30 to T0+50 (zoom in)
TDRSS light curve from T0-1 to T0+2 (More zoom in)
1.6s binned TDRSS light curve
Tilan's background subtracted TDRSS light curves
Extended TDRSS light curve and spacecraft attitude plot(s)
Extended TDRSS lc No.1
Extended TDRSS lc No.2
Extended TDRSS lc No.3
Extended TDRSS lc No.4
TDRSS extended lightcurve from T0-1 to T0+2
T50 and T90 calculation
******************************************
battblocks v1.18
------------------------------------------
Input Data: bat_raw_lc.fits
Output GTI: bb.gti
Events to Skip: 128 Changepoint log(prob) Prior: 6.000000
Internal Tick: 1.000000e-04 s
Lookback time: 0 s
Bkg. Subtract?: yes (for fluence/T50/T90 calculations)
------------------------------------------
Estimated T90 duration: 158.656 s +/- 3.10944 s
Estimated T50 duration: 60.928 s +/- 23.0432 s
Estimated Peak Interval: MET 794977063.10399997 +/- 0.500000 s
Estimated background rate 1: 3766.563 near MET 794977038.400000 s
Estimated background rate 2: 3595.605 near MET 794977233.280000 s
Estimated total duration: 179.84 s (for data selection)
(from MET 794977043.200000 to MET 794977223.040000)
Estimated total fluence: 13671.699615 count
Created GTI with 7 entries
------------------------------------------
Search for this GRB position to the previously BAT detected GRB positions (search radius within 5 arcmin)
bat_grb_pos_cat.sh 351.609 -3.533 0.083
No match
Search for this GRB position to the source locations in BAT transient monitor (search radius within 12 arcmin)
python compare_catalog.py 351.609 -3.533
No match
Link to SIMBAD
Click here for the SIMBAD search!
Frank's UVOT result
Click here!
Frank's UVOT Blinking images
Click here!
Elevation angle of GRB/Sun at the ground telescope locations
GSFC, Greenbelt, Maryland
TimeUT Azimuth Elevation
Sun: 2026 3 12 3 129.508693 -42.364445
Obj: 2026 3 12 3 129.797946 -42.573321
the object visibility at GSFC, Greenbelt, Maryland
MMT Observatory, Mt. Hopkins, Arizona
TimeUT Azimuth Elevation
Sun: 2026 3 12 3 98.526246 -19.748857
Obj: 2026 3 12 3 98.660418 -20.019546
the object visibility at MMT, Mt. Hopkins, Arizona
Hale Telescope, Palomar Mountain, California
TimeUT Azimuth Elevation
Sun: 2026 3 12 3 95.624769 -14.538240
Obj: 2026 3 12 3 95.760418 -14.806534
the object visibility at Hale Telescope, Palomar Mt., California
Mauna Kea, Hawaii
TimeUT Azimuth Elevation
Sun: 2026 3 12 3 78.305236 20.665539
Obj: 2026 3 12 3 78.388247 20.377049
the object visibility at Mauna Kea, Hawaii
Siding Spring Obs., Australia
TimeUT Azimuth Elevation
Sun: 2026 3 12 3 157.251516 60.148301
Obj: 2026 3 12 3 156.664756 60.086114
the object visibility at Siding Spring Obs., Australia
Tokyo, Japan
TimeUT Azimuth Elevation
Sun: 2026 3 12 3 351.070249 51.870707
Obj: 2026 3 12 3 351.554266 51.868642
the object visibility at Tokyo, Japan
William Herschel Telescope, La Palma, Canary Islands, Spain
TimeUT Azimuth Elevation
Sun: 2026 3 12 3 226.560098 -55.776109
Obj: 2026 3 12 3 227.008244 -55.616899
the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain
Gemini South, Cerro Pachon, Chile
TimeUT Azimuth Elevation
Sun: 2026 3 12 3 44.493836 -46.452835
Obj: 2026 3 12 3 44.116433 -46.600229
the object visibility at Gemini South, Cerro Pachon, Chile
The data/results are in /local/data/bat1/prebascript/trigger1500106/tdrss_ql/
bat_raw_lc.fits : TDRSS FITS light curve from GCN
gcn_position.txt : GCN BAT position notice
ratelc_tdrss.qdp : QDP file of the TDRSS light curve
tdrss_lc.gif : GIF TDRSS light curve
sc_att.qdp : QDP file of the spacecraft attitude
sc_att.gif : GIF spacecraft attitude
bb.gti : Bayesian block GTI file (battblocks)
dur.gti : Duration GTI file (battblocks)
battblocks.log : Output log of battblocks
Plot creation:
Wed Mar 11 23:15:05 EDT 2026