GRB 230513A
GCN Circular 33793
Subject
GRB 230513A: Fermi GBM Final Real-time Localization
Date
2023-05-13T22:27:50Z (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 22:17:19 UT on 13 May 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230513A (trigger 705709044.428824 / 230513929).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 160.7, Dec = 27.9 (J2000 degrees, equivalent to J2000 10h 42m, 27d 53'), with a statistical uncertainty of 7.5 degrees.
The angle from the Fermi LAT boresight is 89.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230513929/quicklook/glg_skymap_all_bn230513929.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/bn230513929/quicklook/glg_healpix_all_bn230513929.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230513929/quicklook/glg_lc_medres34_bn230513929.gif
GCN Circular 33801
Subject
GRB 230513A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 705709044)
Date
2023-05-15T01:06:55Z (2 years ago)
From
Tomas Ahumada at U. of Maryland <tahumada@astro.umd.edu>
Harsh Kumar (IITB), Vishwajeet Swain (IITB), Anirudh Salgundi (IITB), Aswin
Suresh (IITB), Tomas Ahumada (CIT), Viraj Karambelkar (CIT), Robert Stein
(CIT), Theophile du Laz (CIT), Igor Andreoni (UMD), Michael Coughlin (UMN),
Mansi Kasliwal (CIT), Simeon Reusch (DESY), Jannis Necker (DESY), Shreya
Anand (CIT), report on behalf of the ZTF collaboration:
We observed the localization region of the short GRB 230513A (trigger
705709044, GCN 33793) detected by the Gamma-Ray Burst Monitor (GBM) on the
Fermi satellite with the Palomar 48 inch telescope equipped with the 47
square degree Zwicky Transient Facility (ZTF) camera. We obtained a series
of g- and r-band images covering 410 square degrees beginning at
2023-05-14T03:42:31.003 (5 hours after the burst trigger time). This
corresponds to ~72% of the probability enclosed in the Earth-occultation
corrected GRB localization map. Each exposure was 300 seconds, reaching
g-band and r-band median depths of 22.2 mag and 22.0 mag respectively. The
images were processed in real-time through the ZTF reduction and image
subtraction pipelines at IPAC (Masci et al. 2019).
We queried the ZTF alert stream using Kowalski (Duev et al. 2019) through
Fritz (Coughlin et al. 2023) and AMPEL (Nordin et al. 2019). We required at
least 2 detections separated by at least 15 minutes to select against
moving objects. Furthermore, we cross-match our candidates with the Minor
Planet Center to flag known asteroids, reject stellar sources (Tachibana
and Miller 2018), and apply machine learning algorithms (Mahabal et al.
2019). We require that no spatially coincident ZTF alerts were issued
before the detection time of the GBM trigger. Close to 120 sources were
time and spatially coincident with the burst, most of them showing g-r ~ 0
mag and a slow evolution. We highlight the sources that show red colors
(i.e. g-r > 0.3 mag) in the table below, and we encourage follow up.
ZTF name , AT name , UT first alert , t-t0 , filter , mag , error
-----------------------------------------------------------------------------------------------
ZTF23aajklxl , AT 2023ilp , 2023-05-14 03:42:31.003 , 0.23 , r , 21.44 ,
0.14
ZTF23aajkqkc , AT 2023ilq , 2023-05-14 03:58:01.998 , 0.24 , r , 20.59 , 0.1
ZTF23aajkuyh , AT 2023ilr , 2023-05-14 04:18:53.001 , 0.25 , r , 21.56 ,
0.13
ZTF23aajlbzl , AT 2023ils , 2023-05-14 04:46:40.002 , 0.27 , g , 21.61 ,
0.15
ZTF23aajktjd , AT 2023ilt , 2023-05-14 04:13:34.003 , 0.25 , r , 21.77 ,
0.17
ZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC,
USA, WIS, Israel; OKC, Sweden; JSI/UMd, USA; U Washington, USA; DESY,
Germany; MOST, Taiwan; UW Milwaukee, USA; LANL USA; Tokyo Tech, Japan;
IITB, India; IIA, India; LJMU, UK; TTU, USA; SDSU, USA and USyd, Australia.
ZTF acknowledges the generous support of the NSF under AST MSIP Grant No
1440341.
GROWTH acknowledges generous support of the NSF under PIRE Grant No 1545949.
Alert distribution service provided by DIRAC@UW (Patterson et al. 2019).
Alert database searches are done by AMPEL (Nordin et al. 2019) and Kowalski
(Duev et al. 2019). GROWTH India telescope is located at the Indian
Astronomical Observatory (Hanle), operated by the Indian Institute of
Astrophysics (IIA). GROWTH-India project is supported by SERB and
administered by IUSSTF, under grant number IUSSTF/PIRE
Program/GROWTH/2015-16 and IUCAA.
--
Tomás Ahumada (he/him)
Ph.D. Candidate
Department of Astronomy
University of Maryland, College Park
NASA <tomas.f.ahumdamena@nasa.gov> Goddard Space Flight Center, Code 661
B.Sc. Astronomy, Pontificia Universidad Católica de Chile
GCN Circular 33812
Subject
GRB 230513A: Zwicky Transient Facility continuous observations of a Fermi Short GRB (Trigger 705709044)
Date
2023-05-18T04:32:06Z (2 years ago)
From
Tomas Ahumada at U. of Maryland <tahumada@astro.umd.edu>
Tomas Ahumada (CIT), Viraj Karambelkar (CIT), Robert Stein (CIT), Harsh
Kumar (IITB), Vishwajeet Swain (IITB), Anirudh Salgundi (IITB), Aswin
Suresh (IITB), Theophile du Laz (CIT), Igor Andreoni (UMD), Michael
Coughlin (UMN), Mansi Kasliwal (CIT), Varun Bhalerao (IITB), Simeon Reusch
(DESY), Jannis Necker (DESY), Shreya Anand (CIT), report on behalf of the
ZTF collaboration:
We re-observed the localization region of the short GRB 230513A (trigger
705709044, GCN 33793) detected by the Gamma-Ray Burst Monitor (GBM) on the
Fermi satellite with the Palomar 48 inch telescope equipped with the 47
square degree Zwicky Transient Facility (ZTF) camera. We obtained a series
of g- and r-band images beginning at 29 and 77 hours after the burst
trigger time. For the first epoch of observations we covered 619.3 square
degrees corresponding to ~82% of the probability region and reaching a
median depth of 21.85 mag in the 300 sec r-band exposures, 22.36 mag in the
450 sec r-band exposures, and 21.82 mag in the 300 sec g-band exposures.
For the second epoch ZTF covered 671.9 square degrees, corresponding to
~85% of the region, and reaching a median depth of 21.71 mag in 300 sec
r-band exposures. The images were processed in real-time through the ZTF
reduction and image subtraction pipelines at IPAC (Masci et al. 2019).
We queried the ZTF alert stream using Kowalski (Duev et al. 2019) through
Fritz (Coughlin et al. 2023) and AMPEL (Nordin et al. 2019). We required at
least 2 detections separated by at least 15 minutes to select against
moving objects. Furthermore, we cross-match our candidates with the Minor
Planet Center to flag known asteroids, reject stellar sources (Tachibana
and Miller 2018), and apply machine learning algorithms (Mahabal et al.
2019). We require that no spatially coincident ZTF alerts were issued
before the detection time of the GBM trigger. Close to 200 sources were
time and spatially coincident with the burst. No source showed a
photometric evolution consistent with a GRB afterglow, including the ones
circulated on GCN 33801.
ZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC,
USA, WIS, Israel; OKC, Sweden; JSI/UMd, USA; U Washington, USA; DESY,
Germany; MOST, Taiwan; UW Milwaukee, USA; LANL USA; Tokyo Tech, Japan;
IITB, India; IIA, India; LJMU, UK; TTU, USA; SDSU, USA and USyd, Australia.
ZTF acknowledges the generous support of the NSF under AST MSIP Grant No
1440341.
GROWTH acknowledges generous support of the NSF under PIRE Grant No 1545949.
Alert distribution service provided by DIRAC@UW (Patterson et al. 2019).
Alert database searches are done by AMPEL (Nordin et al. 2019) and Kowalski
(Duev et al. 2019). GROWTH India telescope is located at the Indian
Astronomical Observatory (Hanle), operated by the Indian Institute of
Astrophysics (IIA). GROWTH-India project is supported by SERB and
administered by IUSSTF, under grant number IUSSTF/PIRE
Program/GROWTH/2015-16 and IUCAA.
--
Tomás Ahumada (he/him)
Ph.D. Candidate
Department of Astronomy
University of Maryland, College Park
NASA <tomas.f.ahumdamena@nasa.gov> Goddard Space Flight Center, Code 661
B.Sc. Astronomy, Pontificia Universidad Católica de Chile