[vsnet-grb-info 16963] GRB 150818A: TSHAO and SAO RAS optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18244
SUBJECT: GRB 150818A: TSHAO and SAO RAS optical observations
DATE:    15/09/07 09:29:09 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

E. Mazaeva (IKI), A. Moskvitin (SAO RAS), I. Reva (Fesenkov 
Astrophysical Institute),  A. Kusakin (Fesenkov Astrophysical 
Institute),  A. Volnova (IKI), A. Pozanenko  (IKI) report on behalf of 
larger GRB follow-up collaboration:

We are continuing observations the field of Swift GRB 150818A (D'Elia et 
al., GCNC 18152) with Zeiss-1000  1-m telescope of Tien Shan 
Astronomical Observatory and Zeiss-1000, 1-m telescope of SAO RAS. The 
optical transient (Marshall et al. GCN 18155; McCauley et al. GCN 18161; 
Mazaeva et al. GCN 18175; Sanchez-Ramirez et al. GCN 18177; Mazaeva et 
al. GCN 18182, GCN 18189, GCN 18205; Schulze et al. GCN 18179) is 
clearly visible on combined images in each epochs. The updated light 
curve of Supernova (de Ugarte Postigo et al. GCN 18213; Mazaeva et al. 
GCN 18205) + host galaxy (Sanchez-Ramirez et al., GCN 18177; de Ugarte 
Postigo et al. GCN 18213) can be found in

http://grb.rssi.ru/GRB150818A/GRB150818A_R_lc.png

The evident maximum of SN brightness (in Rc-filter) was on ~ Sep. 1-2, 
and the brightness of SN+host galaxy was R ~ 21.1 +/- 0.1 on Sep. 6 (UT) 
18:00. We are grateful to V.P. Goranskiy for assistance in SAO RAS 
observations.