Gamma-ray Burst 240215A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 15 Feb 24 15:33:30 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      46
TRIGGER_NUM:     729703985
GRB_RA:          148.083d {+09h 52m 20s} (J2000),
                 148.379d {+09h 53m 31s} (current),
                 147.470d {+09h 49m 53s} (1950)
GRB_DEC:         -10.667d {-10d 40' 00"} (J2000),
                 -10.781d {-10d 46' 50"} (current),
                 -10.431d {-10d 25' 51"} (1950)
GRB_ERROR:       32.25 [deg radius, statistical plus systematic]
GRB_INTEN:       68 [cnts/sec]
DATA_SIGNIF:     5.10 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        20355 TJD;    46 DOY;   24/02/15
GRB_TIME:        55980.41 SOD {15:33:00.41} UT
GRB_PHI:         159.00 [deg]
GRB_THETA:        80.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.58
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 0,0,0, 1,0,1, 0,0,
SUN_POSTN:       328.67d {+21h 54m 42s}  -12.70d {-12d 42' 00"}
SUN_DIST:        156.52 [deg]   Sun_angle= -12.0 [hr] (East of Sun)
MOON_POSTN:       40.99d {+02h 43m 58s}  +18.22d {+18d 13' 09"}
MOON_DIST:       109.71 [deg]
MOON_ILLUM:      40 [%]
GAL_COORDS:      247.83, 32.44 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      154.21,-22.12 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240215648/quicklook/glg_lc_medres34_bn240215648.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 47.82,25.37 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 15 Feb 24 15:33:47 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     729703985
GRB_RA:          138.930d {+09h 15m 43s} (J2000),
                 139.228d {+09h 16m 55s} (current),
                 138.312d {+09h 13m 15s} (1950)
GRB_DEC:          -7.180d {-07d 10' 47"} (J2000),
                  -7.281d {-07d 16' 52"} (current),
                  -6.971d {-06d 58' 15"} (1950)
GRB_ERROR:       11.87 [deg radius, statistical only]
DATA_SIGNIF:     7.20 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        20355 TJD;    46 DOY;   24/02/15
GRB_TIME:        55980.41 SOD {15:33:00.41} UT
GRB_PHI:         166.00 [deg]
GRB_THETA:        73.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       328.67d {+21h 54m 42s}  -12.70d {-12d 42' 00"}
SUN_DIST:        157.92 [deg]   Sun_angle= -11.4 [hr] (East of Sun)
MOON_POSTN:       41.00d {+02h 43m 59s}  +18.22d {+18d 13' 12"}
MOON_DIST:       100.05 [deg]
MOON_ILLUM:      40 [%]
GAL_COORDS:      238.15, 27.57 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      143.76,-21.96 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240215648/quicklook/glg_lc_medres34_bn240215648.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_729703985.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 16 Feb 24 04:31:31 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     729703985
GRB_RA:          135.470d {+09h 01m 53s} (J2000),
                 135.763d {+09h 03m 03s} (current),
                 134.863d {+08h 59m 27s} (1950)
GRB_DEC:          -9.680d {-09d 40' 47"} (J2000),
                  -9.776d {-09d 46' 32"} (current),
                  -9.482d {-09d 28' 56"} (1950)
GRB_ERROR:       19.07 [deg radius, statistical only]
GRB_DATE:        20355 TJD;    46 DOY;   24/02/15
GRB_TIME:        55980.41 SOD {15:33:00.41} UT
GRB_PHI:         164.99 [deg]
GRB_THETA:        68.95 [deg]
E_RANGE:         50.000 - 300.000 [keV]
LOC_ALGORITHM:   415 (Gnd S/W Version number)
SUN_POSTN:       329.20d {+21h 56m 48s}  -12.51d {-12d 30' 51"}
SUN_DIST:        154.02 [deg]   Sun_angle= -11.1 [hr] (East of Sun)
MOON_POSTN:       48.31d {+03h 13m 14s}  +20.87d {+20d 52' 16"}
MOON_DIST:        91.12 [deg]
MOON_ILLUM:      45 [%]
GAL_COORDS:      238.20, 23.34 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      141.08,-25.42 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240215648/quicklook/glg_lc_medres34_bn240215648.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240215648/quicklook/glg_locplot_all_bn240215648.png
COMMENTS:        Fermi-GBM Final Position.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file should be available by the time this FINAL notice is produced.  
COMMENTS:        This notice has human-in-the-loop processing.

GCN Circular #35733
James DeLaunay (PSU), Aaron Tohuvavohu (U Toronto), Samuele Ronchini (PSU), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:
Swift/BAT did not localize GRB 240215A onboard (T0: 2024-02-15T15:33:00.41 UTC, Fermi/GBM trigger 729703985).
The Fermi notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1).
Upon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground.
In ground analysis of the available TTE data, we find the position of the burst with SNR 13.9 in the image domain.
At the time of the trigger, Swift did not have a lock on its star tracker so positions may be inaccurate by up to a few tenths of a degree.
The BAT position is RA, Dec = 132.237, -6.4058, which is:
```
    RA (J2000)     08h 48m 56.88s
    Dec (J2000)  -06d 24' 20.88"
```
with an estimated statistical uncertainty of 3 arcminutes plus ~15 arcminutes due to loss of star tracker loss
XRT and UVOT follow-up has been requested. Results of follow-up observations will be reported in future circulars.
GUANO is a fully autonomous, extremely low latency, spacecraft commanding pipeline designed for targeted recovery of BAT event mode data around the times of compelling astrophysical events to enable more sensitive GRB searches.
A live reporting of Swift/BAT event data recovered by GUANO can be found at: https://www.swift.psu.edu/guano/
GCN Circular #35734
P. A. Evans (U. Leicester) reports on behalf of the Swift team:
Swift has initiated a series of observations, tiled on the sky, of the Swift/BAT GRB 240215A. Automated analysis of the XRT data will be presented online at http://www.swift.ac.uk/xrt_products/TILED_GRB00123
Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. The probability of finding serendipitous sources, unrelated to the Swift/BAT event is high: any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration.
Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).
This circular is an official product of the Swift-XRT team.
GCN Circular #35754
L. Scotton (UAH) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team:
"At 15:33:00.41 UT on 15 February 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240215A (trigger 729703985/240215648), which was also detected by Swift/BAT-GUANO (J. DeLaunay et al. 2024, GCN 35733). The Fermi GBM on-ground location is consistent with the Swift/BAT-GUANO position.
The angle from the Fermi LAT boresight is 67 degrees.
The GBM light curve consists of a pulse followed by weak emission with a duration (T90) of about 57 s (50-300 keV). The time-averaged spectrum from T0-4.1 to T0+60.4 s is best fit by a simple power law function with index -1.77 +/- 0.06.
The event fluence (10-1000 keV) in this time interval is (3.6 +/- 0.3)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0-0.064 s in the 10-1000 keV band is 1.9 +/- 0.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
GCN Circular #35852
D.N. Burrows (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), C. Salvaggio (INAF-OAB), M. Ferro (INAF-OAB), R. Brivio (INAF-OAB), J. D. Gropp (PSU), S. Dichiara (PSU) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
Swift-XRT has performed follow-up observations of the Swift/BAT-detected burst GRB 240215A in a series of observations tiled on the sky. The total exposure time is 4.4 ks, distributed over 4 tiles; the maximum exposure at a single sky location was 2.7 ks. The data were collected between T0+44.5 ks and T0+1384.7 ks, and are entirely in Photon Counting (PC) mode.
Four uncatalogued X-ray sources are detected, of which one ("Source 2") is fading with >3-sigma significance, and is therefore likely the GRB afterglow. The position of this source is RA, Dec=132.0101, -6.5099 which is equivalent to:
```
RA (J2000): 08:48:2.42
Dec(J2000): -06:30:35.5
```
with an uncertainty of 8.1 arcsec (radius, 90% confidence). This position is 14.9 arcmin from the Swift/BAT position. The source is fading with alpha >0.5.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00021670. The results of the full analysis of the tiled XRT observations are available at https://www.swift.ac.uk/xrt_products/TILED_GRB00123.
This circular is an official product of the Swift-XRT team.

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Jochen Greiner, last update: 03-Mar-2024 [Disclaimer]