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GCN Circular 30280

Subject
GRB 210619B: Liverpool Telescope First Hour Observations
Date
2021-06-20T19:09:26Z (3 years ago)
From
Manisha Shrestha at Liverpool John Moores U <m.shrestha@ljmu.ac.uk>
M. Shrestha (Liverpool JMU),  A. Gomboc (Univ. Nova Gorica), C. Guidorzi (Univ. Ferrara) ,  S. Kobayashi (LJMU), A. Melandri (INAF), C. Mundell (Univ. Bath), R. Smith (LJMU) , I.A. Steele (LJMU), report on behalf of a wider collaboration:



We observed the field of Swift GRB 210619B (D'Avanzo et al. GCN 30261; Jelinek et al. GCN 30263; Lipunov et al. GCN 30259; Zhao et al. GCN 30261; Kong et al. GCN 30265; Axelsson et al. GCN 30270; de Ugarte Postigo et al. GCN 30272; Zheng et al. GCN 30273; Blazek et al. GCN 30274; Kann et al. GCN 30275; Svinkin et al. GCN 30276; Xin et al. GCN 30277; Perley et al. GCN 30271 ) with the 2.0m Liverpool Telescope (LT), La Palma on 2021 June 20 starting at 00:21:14.141 UT for a period of 2 hours using the MOPTOP optical imaging polarimeter in the r� band.  Data was calibrated with respect to nearby APASS secondary standard stars.



We confirm the optical counterpart reported by Swift UVOT (GCN 30261).



At T=1318 seconds after the BAT trigger time, we measure r� = 16.1 mag.  Detailed analysis is ongoing.







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