GCN Circular 10064
Subject
GRB 091024: GRAS004 optical observations
Date
2009-10-24T13:21:42Z (15 years ago)
From
Veli-Pekka Hentunen at Taurus Hill Obs,A95 <veli-pekka.hentunen@kassiopeia.net>
Markku Nissinen (Taurus Hill Observatory) and Veli-Pekka Hentunen (Taurus
Hill Observatory) report:
We used Global-rent-a-scope GRAS004 Epsilon 250 telescope with ST-8XE CCD
at RAS Observatory Mayhill H06 (New Mexico, USA) for follow-up observations
of GRB091024 (D.Palmer et al. , GCN 10062). The observations were started
on October 24, at 09:44 UTC (48 min after the burst) and stopped on October,
at 09:58 UTC. One unfiltered 120 seconds image and one unfiltered 600 seconds image
were taken. We detected a very dim uncatalogued optical afterglow object at the position
of RA 22h 36min 59s.68 and DEC +56o 53' 22".6 with respect to POSSII F
(J2000) which is in good correlation with Carole Mundell et al. observation
(GCN 10063). Upper limit for our observations is >18.7 mag. Quoted upper
limit has been derived using POSSII F and USNO-B1.0 field stars as reference.
Filter Tmid(s) Exp(s) OA Mag (CR) USNO-B1.0
unfiltered 09:53:11 600 18.2+/-0.4