GRBweb by P. Coppin

This page lists all entries on GRB240215B in GRBweb

Summary Fermi GBM GCN 35739 GCN 35752 GCN 35763

Summary table
Variable	Value	Source
GRB_name_Fermi	GRB240215828
T0	19:51:40.774 UTC	Fermi_GBM
ra	279.0600°	Fermi_GBM
decl	-44.5000°	Fermi_GBM
pos_error	2.56e+00°	Fermi_GBM
T90	20.736 s	Fermi_GBM
T90_error	1.846 s	Fermi_GBM
T90_start	19:51:40.774 UTC	Fermi_GBM
fluence	1.01e-05 erg/cm²	Fermi_GBM
fluence_error	7.10e-08 erg/cm²	Fermi_GBM
T100	20.736 s
GBM_located	True
mjd	60355.82755525463	Fermi_GBM

Fermi GBM table
GRB_name_Fermi	GRB240215828
trigger_name	bn240215828
ra	279.0600°
decl	-44.5000°
pos_error	2.56e+00°
datum	2024-02-15
t_trigger	19:51:43.846 UTC
T90	20.736 s
T90_error	1.846 s
T90_start	19:51:40.774 UTC
fluence	1.01e-05 erg/cm²
fluence_error	7.10e-08 erg/cm²
flux_1024	1.08e+01 erg/cm²/s
flux_1024_error	3.70e-01 erg/cm²/s
flux_1024_time	4.93e+00 erg/cm²/s
flux_64	1.37e+01 erg/cm²/s
flux_64_error	1.60e+00 erg/cm²/s

GCN 35739 table
GRB_name	GRB240215B
GCN_number	35739
Detection_method	Swift Other
Circular_text	TITLE: GCN CIRCULAR NUMBER: 35739 SUBJECT: GRB 240215B: Swift/BAT-GUANO detection of a burst outside the coded FOV DATE: 24/02/16 18:36:56 GMT FROM: Jimmy DeLaunay at Penn State James DeLaunay (PSU), Samuele Ronchini (PSU), Gayathri Raman (PSU), Aaron Tohuvavohu (U Toronto), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report: Swift/BAT did not localize GRB 240215B onboard (T0: 2024-02-15T19:51:43.85 UTC, Fermi trig 729719508) 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. The BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), performed on the temporal window [T0-20 s, T0+20 s], detects the burst with a sqrt(TS) of 28.8 in a 8.192 s analysis time bin, starting at T0. NITRATES results are consistent with a burst coming from outside the FOV, with DeltaLLHOut of -28.4. See Section 9.1 and Figures 10 and 17 in the NITRATES paper for brief descriptions and interpretation of sqrt(TS), DeltaLLHPeak, and DeltaLLHOut. 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 35752 table
GRB_name	GRB240215B
GCN_number	35752
Detection_method	Fermi GBM Det
t_trigger	19:51:49 UTC
Circular_text	TITLE: GCN CIRCULAR NUMBER: 35752 SUBJECT: GRB 240215B: GRBAlpha detection DATE: 24/02/18 21:35:25 GMT FROM: Andras Pal at Konkoly Observatory A. Pal (Konkoly Observatory), M. Dafcikova, J. Ripa, M. Kolar, N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, L. Szakszonova, J.-P. Breuer, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration. The long-duration GRB 240215B (Swift/BAT detection: GCN 35739; Fermi/GBM detection: GCN 35740; INTEGRAL/SPI-ACS peak detection at 2024-02-15 ~19:51:47) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023, A&A, 677, 40; arXiv:2302.10048). The detection was confirmed at the peak time 2024-02-15 19:51:49 UTC. The T90 duration measured by GRBAlpha is 16.5 s and the overall significance during T90 reaches 23 sigma. The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB240215B_GCN.pdf All GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/hea/GRBAlpha/ GRBAlpha, launched on 2021 March 22, is a demonstration mission for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~50 keV to ~1000 keV. To increase the duty cycle and the downlink rate, the upgrade of the on-board data acquisition software stack is in progress. The ground segment is also supported by the radio amateur community and it takes advantage of the SatNOGS network for increased data downlink volume.

GCN 35763 table
GRB_name	GRB240215B
GCN_number	35763
Detection_method	Fermi GBM Det
t_trigger	19:51:43.850 UTC
ra	309.5200°
decl	-48.7400°
Circular_text	TITLE: GCN CIRCULAR NUMBER: 35763 SUBJECT: GRB 240215B: Fermi GBM Observation DATE: 24/02/20 16:45:45 GMT FROM: Lorenzo Scotton at UAH L. Scotton (UAH) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 19:51:43.85 UT on 15 February 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240215B (trigger 729719508/240215828), which was also detected by Swift/BAT-GUANO (J. DeLaunay et al. 2024, GCN 35739), and GRBAlpha (A. Pal et al. 2024, GCN 35752). The Fermi GBM Final Real-time Localization was reported in GCN 35740, but was mislabelled as GRB 240215C. After manual inspection, a more accurate on-ground location was found to be RA = 309.52, Dec = -48.74, with a statistical uncertainty of 2.54 degrees. The angle from the Fermi LAT boresight is 94 degrees. The GBM light curve consists of a single emission episode with a duration (T90) of about 21 s (50-300 keV). The time-averaged spectrum from T0-5.5 to T0+21.5 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.16 +/- 0.04 and the cutoff energy, parameterized as Epeak, is 210 +/- 10 keV. The event fluence (10-1000 keV) in this time interval is (1.12 +/- 0.04)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+4.9 s in the 10-1000 keV band is 10.8 +/- 0.4 ph/s/cm^2. A Band function fits the spectrum equally well with Epeak= 190 +/- 20 keV, alpha = -1.13 +/- 0.05 and beta = -2.5 +/- 0.3. 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/"