GRB 241115B
GCN Circular 38241
Subject
GRB 241115B: Fermi GBM Final Real-time Localization
Date
2024-11-15T18:18:08Z (6 months ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely LONG GRB
At 18:07:25 UT on 15 Nov 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 241115B (trigger 753386850.967696 / 241115755).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 31.8, Dec = 45.0 (J2000 degrees, equivalent to J2000 02h 07m, 45d 00'), with a statistical uncertainty of 9.2 degrees.
The angle from the Fermi LAT boresight is 97.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241115755/quicklook/glg_skymap_all_bn241115755.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241115755/quicklook/glg_healpix_all_bn241115755.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241115755/quicklook/glg_lc_medres34_bn241115755.gif
GCN Circular 38244
Subject
Fermi GRB 241115B: Global MASTER-Net observations report
Date
2024-11-15T20:00:52Z (6 months ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
legacy email
V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko,
A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin,
V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU),
O.Gress, N.Budnev (ISU),
C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity)
D.Buckley (SAAO),
R.Rebolo (The Instituto de Astrofisica de Canarias),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)
MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 241115B ( Fermi GBM team, GCN 38241) errorbox 5337 sec after notice time and 5370 sec after trigger time at 2024-11-15 19:36:56 UT, with upper limit up to 16.8 mag. The observations began at zenith distance = 77 deg. The sun altitude is -25.5 deg.
The galactic latitude b = -15 deg., longitude l = 137 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2671334
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
5400 | 2024-11-15 19:36:56 | MASTER-SAAO | (01h 09m 37.94s , +44d 33m 45.2s) | C | 60 | 16.6 |
6289 | 2024-11-15 19:51:44 | MASTER-SAAO | (01h 09m 58.65s , +44d 32m 52.9s) | C | 60 | 16.8 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 38260
Subject
GRB 241115B: Swift/BAT-GUANO localization skymap of a long burst
Date
2024-11-17T03:54:42Z (6 months ago)
From
Samuele Ronchini at PSU <sjs8171@psu.edu>
Via
Web form
Samuele Ronchini (PSU), James DeLaunay (PSU), Aaron Tohuvavohu (Caltech), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:
Swift/BAT did not localize GRB 241115B onboard (T0: 2024-11-15T18:07:25.97 UTC, Fermi GCN 38241)
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 15.25 in a 2.048 s analysis time bin, starting at T0 + 12.8001 s.
Using the NITRATES analysis, parameter estimation was performed to obtain the localization of this burst in the form of a HEALPIX Multi-Order Coverage (MOC) skymap. This localization accounts for both statistical and systematic errors. More details in the creation and calibration of these maps will soon be published (DeLaunay et al. 2024. in prep)
The 90% credible area is 12371 deg2 and the 50% credible area is 3770 deg2.
The integrated probability inside the coded field of view is <1%.
The NITRATES skymap is consistent with the Fermi localization reported in the final position notice. The combined Fermi/GBM+NITRATES 90% credible area is 286 deg2 and the 50% credible area is 82 deg2.
A plot of the probability skymap can be viewed here:
[skymap_plot](https://guano.swift.psu.edu/trigger_report?id=753386880/#:~:text=Probability%20Skymap)
The probability skymap file can be downloaded from the link here
[skymap_fits_file](https://guano.swift.psu.edu/files/753386880/0_n_PROBMAP)
Instructions on how to read and manipulate this map can be found here:
https://guano.swift.psu.edu/documentation
More details about this burst can be found on the trigger report page here:
https://guano.swift.psu.edu/trigger_report?id=753386880
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 38271
Subject
GRB 241115B: Fermi GBM Observation
Date
2024-11-18T20:06:33Z (6 months ago)
From
oindabimukherjee@gmail.com
Via
Web form
O. Mukherjee (USRA), S. Bala (USRA) and C. Meegan (UAH) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:
"At 18:07:25.97 UT on 15 November 2024, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 241115B (trigger 753386850/241115755).
which was also detected by Swift/BAT-NITRATES (Ronchini et al. 2024, GCN 38260).
The Fermi GBM on-ground location was reported in GCN 38241.
The angle from the Fermi LAT boresight is 97 degrees.
The GBM light curve consists of multiple peaks with a duration (T90)
of about 71 s (50-300 keV). The time-averaged spectrum
from T0-8.9 to T0+70.9 s is best fit by
a power law function with an exponential high-energy cutoff.
The power law index is -1.04 +/- 0.09 and the cutoff energy,
parameterized as Epeak, is 833 +/- 263 keV.
The event fluence (10-1000 keV) in this time interval is
(9.9 +/- 0.5)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+14 s in the 10-1000 keV band is 3.2 +/- 0.2 ph/s/cm^2.
A Band function fits the spectrum equally well with
Epeak = 780 +/- 272 keV, alpha = -1.03 +/- 0.09 and beta = -2.65 +/- 1.39.
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/"