GRB 230511D
GCN Circular 33803
Subject
IPN triangulation of GRB 230511D (short)
Date
2023-05-15T12:15:18Z (2 years ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko,
on behalf of the IPN,
A. Goldstein, M. S. Briggs, C. Wilson-Hodge,
and E. Burns on behalf of the Fermi GBM team,
and
E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,
report:
The short-duration GRB 230511D
(Fermi-GBM detection: The Fermi GBM team, GCN Circ. 33775)
was detected by Fermi (GBM trigger 705537623) and
INTEGRAL (SPI-ACS) at about 81618 s UT (22:40:18).
We have triangulated it to a GBM-SPI-ACS annulus centered at
RA(2000)=33.057 deg (02h 12m 14s) Dec(2000)=-40.890 deg (-40d 53' 25")
whose radius is 63.439 +/- 5.830 deg (3 sigma).
The annulus combined with the Fermi-GBM final position (GCN 33775;
glg_healpix_all_bn230511945_v00) gives 530 sq. deg (3 sigma) localization region.
A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB230511_T81618/IPN
GCN Circular 33782
Subject
GRB 230511D: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 705537623)
Date
2023-05-12T20:19:22Z (2 years ago)
From
Viraj Karambelkar at Indian Inst of Tech,Bombay <karambelkarvraj21197@gmail.com>
Viraj Karambelkar, Robert Stein (Caltech), Simeon Reusch (DESY), Theophile
du Laz (Caltech), Aswin Suresh, Harsh Kumar, Vishwajeet Swain, Varun
Bhalerao (IIT Bombay), Jannis Necker (DESY), Tomas Ahumada (Caltech) on
behalf of the Zwicky Transient Facility Collaboration.
We observed the localization region of Fermi GRB 230511D (trigger
705537623). We obtained a total of 75 images covering ztfg, ztfr bands for
a total of 8750 seconds. The observations covered 951.5 square degrees
beginning at 2023-05-12T04:02:10.000 (5 hours after the burst trigger time)
corresponding to ~60% of the probability enclosed in the localization
region. The median depth of the observations was ~21.3 mag. Our
observations cover the part of the localization that is northwards of -24
degrees declination. Any candidate-counterparts will be announced in
forthcoming GCNs.
GCN Circular 33775
Subject
GRB 230511D: Fermi GBM Final Real-time Localization
Date
2023-05-11T22:50:51Z (2 years ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
The Fermi GBM team reports the detection of a likely SHORT GRB
At 22:40:18 UT on 11 May 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230511D (trigger 705537623.19843 / 230511945).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 237.5, Dec = -17.4 (J2000 degrees, equivalent to J2000 15h 50m, -17d 23'), with a statistical uncertainty of 21.7 degrees.
The angle from the Fermi LAT boresight is 79.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230511945/quicklook/glg_skymap_all_bn230511945.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230511945/quicklook/glg_healpix_all_bn230511945.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230511945/quicklook/glg_lc_medres34_bn230511945.gif