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GCN Circular 27749

Subject
Swift J1818.0-1607: BOOTES-3/YA optical upper limit
Date
2020-05-17T11:11:57Z (4 years ago)
From
Youdong HU at IAA-CSIC <youdong@iaa.es>
Y.-D. Hu, E. Fernandez-Garcia, A. J. Castro-Tirado (IAA-CSIC), I. 
Carrasco and C. Perez del Pulgar (Univ. de Malaga), M. D.
Caballero-Garcia (ASU-CAS, CZ) and R. Querel (NIWA), on behalf of a 
larger collaboration,
report:

The 60cm BOOTES-3/YA robotic telescope at NIWA Lauder in Otago (New 
Zealand) automatically responded to the Swift trigger of SGR Swift 
J1818.0-1607 (Gronwall et al. GCNC 27746). The first image (clear 
filter) were obatined starting at 15:03:57 UT(~ 29 s after trigger). In
the co-added image (79 exposures, 1s each), no source is found at the 
position reported by Swift/XRT (Gronwall et al. GCNC 27746) down to 18.5 
mag, which is in agreement with the non-detection reported by Lipunov et 
al. (GCNC 27747). Further observation is ongoing.

We thank the staff at NIWA for its excellent support.
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