From gcncirc@capella2.gsfc.nasa.gov Tue Sep 21 15:26:54 2021 From: GCN Circulars To: vsnet-grb-info@ooruri.kusastro.kyoto-u.ac.jp Subject: [vsnet-grb-info 28756] GRB 210919a: Lowell Discovery Telescope upper limits Date: Tue, 21 Sep 2021 11:26:50 -0400 Message-ID: <20210921152650.GA22457@capella2.gsfc.nasa.gov> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="===============2601687691746685194==" --===============2601687691746685194== Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit TITLE: GCN CIRCULAR NUMBER: 30859 SUBJECT: GRB 210919a: Lowell Discovery Telescope upper limits DATE: 21/09/21 15:25:55 GMT FROM: Amy Gottlieb at UMD

A.Gottlieb (UMD, NASA-GSFC), S.Dich= iara (UMD, NASA-GSFC),  S.B. Cenko

= (NASA-GSFC), E. Troja (UMD, NASA-GSFC), J.M. Durbak (UMD), A. Kutyrev =

(UMD, NASA-GSFC), S. Veilleux (UMD), report = on behalf of a larger

collaboration:

 

= We observed the field of the short GRB 210919A (Tohuvavohu et al.,

GCN Circ. 30846) using the Large Monolithic Ima= ger (LMI) on the 4.3m

Lowell Discovery = Telescope (LDT) at Happy Jack, AZ. Observations

started on September 21, 11:27:43 UT (2.46 days after the Swift

trigger) taking 5 exposures of 200 s each= with SDSS r filter.

Observations were = taken at an airmass of about 1.27 and seeing of

about 1.5". We do not find any source inside the enhanced

XRT position (Goad et al., GCN Circ. 30850= ) down to a 3-sigma

limiting magnitude = of r>23.6 AB mag.

Magnitudes are cali= brated against the SDSS catalog and not

corrected for Galactic extinction.

&nbs= p;

We thank the staff of the Lowell Disc= overy Telescope for assistance

with the= se observations.

 

 

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