TITLE:   GCN CIRCULAR
NUMBER:  33783
SUBJECT: GRB 230430A: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 704533643)
DATE:    23/05/12 20:20:45 GMT
FROM:    Tomas Ahumada at U. of Maryland <tahumada@astro.umd.edu>

Tomas Ahumada (CIT), Shreya Anand (CIT), Viraj Karambelkar (CIT), Robert
Stein (CIT), Theophile du Laz (CIT), Michael Coughlin (UMN), Mansi Kasliwal
(CIT), Simeon Reusch (DESY), Jannis Necker (DESY) report on behalf of the
ZTF collaboration:

We observed the localization region of the short GRB 230430A (trigger
704533643) 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; Bellm et al., 2019; Graham et al.,
2019) camera. We obtained a series of g- and r-band images covering about
132.4 square degrees beginning at 2023-05-01T04:45:43.004 (~20 hours after
the burst trigger time) corresponding to ~93% of the probability enclosed
in the intersection between the GBM (GCN 33713) and the preliminary IPN
region. Our observations contain the final IPN region (GCN 33718).
Exposures reached a median depth of 21.5 mag in the g-band and 21.5 mag in
the r-band. No potential counterparts were found.

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.
<https://hackmd.io/JGjJMLLsSPW4EwSesjMTdA#>


-- 
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