GRB 240115A
GCN Circular 35578
Subject
GRB 240115A: Fermi GBM Observation
Date
2024-01-19T15:36:32Z (2 years ago)
From
rachel.hamburg@ijclab.in2p3.fr
Via
Web form
R. Hamburg (CNRS/IN2P3) and C. Meegan (UAH) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:
"At 11:03:14.11 UT on 15 January 2024, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 240115A (trigger 727009399/240115461),
which was also detected by Swift/BAT-GUANO (DeLaunay et al. 2024, GCN 35557).
The Fermi Final Real-time Localization is reported in GCN 35537.
The angle from the Fermi LAT boresight is 37 degrees.
The GBM light curve consists of one main pulse with a duration (T90)
of about 1.79 s (50-300 keV). The time-averaged spectrum
from T0-0.26 to T0+0.77 s is best fit by a power law function
with an exponential high-energy cutoff.
The power law index is -0.7 +/- 0.2 and the cutoff energy,
parameterized as Epeak, is 450 +/- 137 keV.
The event fluence (10-1000 keV) in this time interval is
(4.8 +/- 0.6)E-07 erg/cm^2. The 64-ms peak photon flux measured
starting from T0+0.64 s in the 10-1000 keV band is 3.4 +/- 1.0 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 35557
Subject
GRB 240115A: Swift/BAT-GUANO detection of a short burst
Date
2024-01-17T21:20:29Z (2 years ago)
From
Jimmy DeLaunay at Penn State <delauj2@gmail.com>
Via
Web form
James DeLaunay (PSU), Gayathri Raman (PSU), Samuele Ronchini (PSU), Aaron Tohuvavohu (U Toronto), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:
Swift/BAT did not localize GRB 240115A onboard (T0: 2024-01-15T11:03:14.11 UTC, Fermi GBM Trig 727009399, INTEGRAL SPI-ACS Trig 10471).
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 7.5 in a 1.024 s analysis time bin, starting at T0 - 0.256 s.
NITRATES results, independently, are ambiguous with respect to whether this burst originates from in or outside the BAT coded FOV, with a DeltaLLHOut of 5.4.
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 Circular 35538
Subject
Fermi GRB 240115A: Global MASTER-Net observations report
Date
2024-01-15T15:30:57Z (2 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
legacy email
V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,
G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij
(Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile
(Observatorio Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra
(The Instituto de Astrofisica de Canarias),
D. Buckley
(South African Astronomical Observatory),
O.A. Gress, N.M. Budnev, O.Ershova
(Irkutsk State University, API),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez
(INAOE, Guillermo Haro Astrophysics Observatory),
A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich
(Blagoveschensk Educational State University)
MASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 240115A ( Fermi GBM team, GCN 35537) errorbox 13877 sec after notice time and 13910 sec after trigger time at 2024-01-15 14:55:04 UT, with upper limit up to 19.2 mag. Observations started at twilight. The observations began at zenith distance = 19 deg. The sun altitude is -10.0 deg.
The galactic latitude b = -37 deg., longitude l = 128 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2356263
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
13941 | 2024-01-15 14:55:04 | MASTER-Kislovodsk | (01h 07m 03.13s , +24d 05m 02.7s) | C | 60 | 17.4 |
13941 | 2024-01-15 14:55:04 | MASTER-Kislovodsk | (01h 02m 17.63s , +24d 26m 24.4s) | C | 60 | 17.9 |
14021 | 2024-01-15 14:56:24 | MASTER-Kislovodsk | (01h 08m 11.48s , +25d 57m 59.8s) | C | 60 | 17.3 |
14021 | 2024-01-15 14:56:24 | MASTER-Kislovodsk | (01h 03m 20.55s , +26d 19m 30.1s) | C | 60 | 18.1 |
14101 | 2024-01-15 14:57:44 | MASTER-Kislovodsk | (01h 06m 06.56s , +22d 09m 02.3s) | C | 60 | 17.6 |
14101 | 2024-01-15 14:57:44 | MASTER-Kislovodsk | (01h 01m 25.70s , +22d 30m 16.1s) | C | 60 | 18.2 |
14181 | 2024-01-15 14:59:05 | MASTER-Kislovodsk | (01h 09m 19.88s , +27d 51m 14.0s) | C | 60 | 17.9 |
14181 | 2024-01-15 14:59:05 | MASTER-Kislovodsk | (01h 04m 22.98s , +28d 12m 53.3s) | C | 60 | 18.6 |
14342 | 2024-01-15 15:01:45 | MASTER-Kislovodsk | (01h 11m 41.84s , +27d 51m 13.9s) | C | 60 | 12.2 |
14342 | 2024-01-15 15:01:45 | MASTER-Kislovodsk | (01h 06m 17.06s , +28d 12m 53.2s) | C | 60 | 13.0 |
14428 | 2024-01-15 15:03:12 | MASTER-Kislovodsk | (01h 23m 42.15s , +24d 03m 56.9s) | C | 60 | 17.6 |
14428 | 2024-01-15 15:03:12 | MASTER-Kislovodsk | (01h 18m 55.85s , +24d 25m 21.2s) | C | 60 | 18.4 |
14508 | 2024-01-15 15:04:32 | MASTER-Kislovodsk | (01h 24m 59.31s , +25d 58m 54.8s) | C | 60 | 17.6 |
14508 | 2024-01-15 15:04:32 | MASTER-Kislovodsk | (01h 20m 07.62s , +26d 20m 27.2s) | C | 60 | 18.5 |
14588 | 2024-01-15 15:05:52 | MASTER-Kislovodsk | (01h 22m 39.20s , +22d 09m 58.7s) | C | 60 | 17.7 |
14589 | 2024-01-15 15:05:52 | MASTER-Kislovodsk | (01h 17m 57.65s , +22d 31m 14.5s) | C | 60 | 18.5 |
14669 | 2024-01-15 15:07:12 | MASTER-Kislovodsk | (01h 10m 31.29s , +29d 44m 45.2s) | C | 60 | 18.1 |
14669 | 2024-01-15 15:07:12 | MASTER-Kislovodsk | (01h 05m 27.63s , +30d 06m 28.4s) | C | 60 | 19.0 |
14749 | 2024-01-15 15:08:33 | MASTER-Kislovodsk | (00h 53m 05.72s , +29d 44m 46.8s) | C | 60 | 17.6 |
14749 | 2024-01-15 15:08:33 | MASTER-Kislovodsk | (00h 48m 02.39s , +30d 06m 24.1s) | C | 60 | 18.5 |
14829 | 2024-01-15 15:09:53 | MASTER-Kislovodsk | (01h 26m 28.47s , +27d 52m 28.5s) | C | 60 | 18.3 |
14829 | 2024-01-15 15:09:53 | MASTER-Kislovodsk | (01h 21m 30.85s , +28d 14m 03.1s) | C | 60 | 19.1 |
14909 | 2024-01-15 15:11:13 | MASTER-Kislovodsk | (01h 07m 06.90s , +24d 03m 15.5s) | C | 60 | 17.8 |
14909 | 2024-01-15 15:11:13 | MASTER-Kislovodsk | (01h 02m 20.68s , +24d 24m 31.4s) | C | 60 | 18.7 |
14989 | 2024-01-15 15:12:33 | MASTER-Kislovodsk | (01h 07m 45.05s , +24d 03m 14.9s) | C | 60 | 12.2 |
15070 | 2024-01-15 15:13:54 | MASTER-Kislovodsk | (01h 06m 06.89s , +22d 09m 52.3s) | C | 60 | 17.9 |
15070 | 2024-01-15 15:13:54 | MASTER-Kislovodsk | (01h 01m 25.53s , +22d 31m 04.6s) | C | 60 | 18.8 |
15150 | 2024-01-15 15:15:14 | MASTER-Kislovodsk | (01h 09m 14.79s , +27d 52m 44.6s) | C | 60 | 18.2 |
15150 | 2024-01-15 15:15:14 | MASTER-Kislovodsk | (01h 04m 17.33s , +28d 14m 21.2s) | C | 60 | 19.1 |
15231 | 2024-01-15 15:16:34 | MASTER-Kislovodsk | (00h 51m 17.60s , +25d 57m 43.3s) | C | 60 | 17.6 |
15231 | 2024-01-15 15:16:34 | MASTER-Kislovodsk | (00h 46m 26.19s , +26d 19m 07.1s) | C | 60 | 18.6 |
15311 | 2024-01-15 15:17:55 | MASTER-Kislovodsk | (00h 50m 25.77s , +24d 02m 44.3s) | C | 60 | 17.5 |
15311 | 2024-01-15 15:17:55 | MASTER-Kislovodsk | (00h 45m 39.64s , +24d 23m 59.8s) | C | 60 | 18.6 |
15391 | 2024-01-15 15:19:15 | MASTER-Kislovodsk | (00h 52m 08.59s , +27d 51m 01.3s) | C | 60 | 17.7 |
15391 | 2024-01-15 15:19:15 | MASTER-Kislovodsk | (00h 47m 11.31s , +28d 12m 32.4s) | C | 60 | 18.7 |
15471 | 2024-01-15 15:20:35 | MASTER-Kislovodsk | (01h 23m 45.34s , +24d 04m 49.5s) | C | 60 | 17.8 |
15471 | 2024-01-15 15:20:35 | MASTER-Kislovodsk | (01h 18m 58.26s , +24d 26m 10.2s) | C | 60 | 18.7 |
15552 | 2024-01-15 15:21:55 | MASTER-Kislovodsk | (01h 25m 03.41s , +25d 57m 04.1s) | C | 60 | 17.7 |
15552 | 2024-01-15 15:21:55 | MASTER-Kislovodsk | (01h 20m 11.05s , +26d 18m 33.0s) | C | 60 | 18.8 |
15632 | 2024-01-15 15:23:15 | MASTER-Kislovodsk | (01h 22m 39.41s , +22d 10m 36.5s) | C | 60 | 16.2 |
15632 | 2024-01-15 15:23:15 | MASTER-Kislovodsk | (01h 17m 57.15s , +22d 31m 48.8s) | C | 60 | 17.0 |
15712 | 2024-01-15 15:24:35 | MASTER-Kislovodsk | (01h 24m 25.47s , +22d 10m 36.3s) | C | 60 | 12.7 |
15800 | 2024-01-15 15:26:03 | MASTER-Kislovodsk | (01h 26m 31.35s , +27d 51m 45.8s) | C | 60 | 18.5 |
15800 | 2024-01-15 15:26:03 | MASTER-Kislovodsk | (01h 21m 33.05s , +28d 13m 22.4s) | C | 60 | 19.2 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 35537
Subject
GRB 240115A: Fermi GBM Final Real-time Localization
Date
2024-01-15T11:13:50Z (2 years 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 SHORT GRB
At 11:03:14 UT on 15 Jan 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240115A (trigger 727009399.105114 / 240115461).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 16.3, Dec = 25.0 (J2000 degrees, equivalent to J2000 01h 05m, 25d 00'), with a statistical uncertainty of 4.4 degrees.
The angle from the Fermi LAT boresight is 37.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240115461/quicklook/glg_skymap_all_bn240115461.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/bn240115461/quicklook/glg_healpix_all_bn240115461.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240115461/quicklook/glg_lc_medres34_bn240115461.gif