GRB 241206A
GCN Circular 38447
Subject
GRB 241206A: Fermi GBM Final Real-time Localization
Date
2024-12-06T12:17:08Z (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 12:06:49 UT on 6 Dec 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 241206A (trigger 755179614.876062 / 241206505).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 215.5, Dec = 56.0 (J2000 degrees, equivalent to J2000 14h 22m, 56d 00'), with a statistical uncertainty of 5.2 degrees.
The angle from the Fermi LAT boresight is 38.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241206505/quicklook/glg_skymap_all_bn241206505.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/bn241206505/quicklook/glg_healpix_all_bn241206505.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241206505/quicklook/glg_lc_medres34_bn241206505.gif
GCN Circular 38448
Subject
Fermi GRB 241206A: Global MASTER-Net observations report
Date
2024-12-06T12:45:34Z (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-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB 241206A ( Fermi GBM team, GCN 38447) errorbox 138 sec after notice time and 170 sec after trigger time at 2024-12-06 12:09:40 UT, with upper limit up to 18.9 mag. The observations began at zenith distance = 73 deg. The sun altitude is -28.5 deg.
The galactic latitude b = 57 deg., longitude l = 99 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2698262
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
186 | 2024-12-06 12:09:40 | MASTER-Tunka | (13h 51m 49.84s , +53d 43m 36.3s) | C | 30 | 18.1 |
231 | 2024-12-06 12:09:40 | MASTER-Tunka | (13h 51m 49.88s , +53d 43m 35.4s) | C | 120 | 18.9 | Coadd
224 | 2024-12-06 12:10:13 | MASTER-Tunka | (13h 51m 49.88s , +53d 43m 33.9s) | C | 40 | 18.4 |
272 | 2024-12-06 12:10:57 | MASTER-Tunka | (13h 51m 49.94s , +53d 43m 31.7s) | C | 50 | 18.4 |
331 | 2024-12-06 12:11:50 | MASTER-Tunka | (13h 51m 49.97s , +53d 43m 28.4s) | C | 60 | 18.5 |
626 | 2024-12-06 12:16:21 | MASTER-Tunka | (14h 21m 06.04s , +56d 07m 49.0s) | C | 110 | 18.2 |
755 | 2024-12-06 12:18:14 | MASTER-Tunka | (14h 21m 06.00s , +56d 07m 43.3s) | C | 140 | 18.3 |
913 | 2024-12-06 12:20:38 | MASTER-Tunka | (14h 21m 05.87s , +56d 07m 35.0s) | C | 170 | 18.5 |
1092 | 2024-12-06 12:23:31 | MASTER-Tunka | (14h 21m 05.93s , +56d 07m 26.5s) | C | 180 | 18.6 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 38453
Subject
GRB 241206A: Swift/BAT-GUANO localization skymap of a burst
Date
2024-12-06T20:20:25Z (6 months ago)
From
Jimmy DeLaunay at Penn State <delauj2@gmail.com>
Via
Web form
James DeLaunay (PSU), Samuele Ronchini (PSU), Aaron Tohuvavohu (Caltech), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:
Swift/BAT did not localize GRB 241206A onboard (T0: 2024-12-06T12:06:49.88 UTC, Fermi trig 755179614)
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 11.5 in a 4.096 s analysis time bin, starting at T0 + 19.456 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 685 deg2 and the 50% credible area is 78 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 (GCN 38447). The combined Fermi/GBM+NITRATES 90% credible area is 108 deg2 and the 50% credible area is 30 deg2.
A plot of the probability skymap can be viewed here:
[skymap_plot](https://guano.swift.psu.edu/trigger_report?id=755179644/#:~:text=Probability%20Skymap)
The probability skymap file can be downloaded from the link here
[skymap_fits_file](https://guano.swift.psu.edu/files/755179644/0_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=755179644
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 38456
Subject
GRB 241206A: Fermi GBM observation
Date
2024-12-07T11:45:13Z (6 months ago)
From
Christian Malacaria at INAF-OAR <cmalacaria.astro@gmail.com>
Via
Web form
C. Malacaria (INAF-OAR) and C. Meegan (UAH) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:
"At 12:06:49.88 UT on 06 December 2024, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 241206A (trigger 755179614/241206505).
The Fermi GBM Final Real-time Localization is reported in GCN 38447.
Swift-BAT/GUANO also detected the burst (GCN 38453, DeLaunay et al. 2024)
and its localization is consistent with the Fermi GBM localization.
The angle from the Fermi LAT boresight is 38 degrees.
The GBM light curve consists of a double peak with a duration (T90)
of about 31 s (50-300 keV). The time-averaged spectrum
from T0-1.9 to T0+16.5 s is best fit by
a power law function with an exponential high-energy cutoff.
The power law index is -1.5 +/- 0.1 and the cutoff energy,
parameterized as Epeak, is 87 +/- 12 keV.
The event fluence (10-1000 keV) in this time interval is
(2.4 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+21 s in the 10-1000 keV band is 6.0 +/- 0.3 ph/s/cm^2.
A Band function fits the spectrum equally well
with Epeak= 70 +/- 20 keV, alpha = -1.4 +/- 0.2 and beta = -2.3 +/- 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/"
GCN Circular 38469
Subject
GRB 241206A: DDOTI Upper Limit on the Afterglow
Date
2024-12-08T16:02:20Z (6 months ago)
From
Rosa L. Becerra at Tor Vergata, Roma <rosa.becerra@roma2.infn.it>
Via
Web form
Rosa L. Becerra (Tor Vergata, Roma), Alan M. Watson (UNAM), Eleonora Troja (Tor Vergata, Roma), Camila Angulo Valdez (UNAM), Nat Butler (ASU), Simone Dichiara (Penn State University), Tsvetelina Dimitrova (ASU), Alexander Kutyrev (GSFC/UMD), William H. Lee (UNAM), Océlotl López (UNAM), and Margarita Pereyra (UNAM) report:
We observed the field of the GRB 241206A detected by Fermi/GBM (Fermi GBM Team, GCN 38447) and Swift/BAT-GUANO (DeLaunay et al., GCN 38453) with the DDOTI/OAN wide-field imager at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir (http://ddoti.astroscu.unam.mx) on 2024-12-08 from 09:51 to 13:14 UTC (45.7 to 49.2 hrs after the event), obtaining a total of 1.7 hours of exposure in the w filter down to a 10-sigma limiting magnitude of w = 20.5.
Comparing our observations to the USNO-B1 and PanSTARRS PS1 DR2 catalogues, we
detect no uncatalogued sources within the observed field to our 10-sigma limit within the error radius reported by Fermi/GBM (Fermi GBM Team, GCN 38447).
We thank the DDOTI technical team and the staff of the Observatorio Astronómico Nacional.