[AAVSO-HEN] GRB 090621B: I-band observations from 1.23m CAHA

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
For an archive and more information on circulars visit:
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TITLE:   GCN CIRCULAR
NUMBER:  9561
SUBJECT: GRB 090621B: I-band observations from 1.23m CAHA
DATE:    09/06/22 20:05:29 GMT
FROM:    Javier Gorosabel at IAA-CSIC  <jgu at iaa.es>

J. Gorosabel (IAA-CSIC), P. Kubanek (GACE and IAA-CSIC), S. Mottola  
(DLR), U. Carsenty (DLR), A. Levan (U. Warwick), M. Jelinek (IAA- 
CSIC), A.J. Castro-Tirado (IAA-CSIC), A. de Ugarte Postigo (ESO, INAF/ 
OAB), report on behalf of a larger collaboration:

"Following the detection of the short-hard GRB 090621B by SWIFT  
(Curran et al. GCNC 9545) we carried out I-band observations with the  
1.23m telescope at Observatory of Calar Alto. The observations were  
done on June 22.094-22.161 UT (4.14-5.75 hours post burst) with a  
total exposure time of 22x240s. The candidates reported by Levan et  
al. (GCNC 9547) and Galeev (GCNC 9549) are preliminarily detected at  
I~22.5 and I~20.6, respectively, against USNO-B field stars."