GCN Circular 17638
Subject
GRB 150323B : Xinglong TNT upper limit
Event
Date
2015-03-25T07:03:31Z (11 years ago)
From
L.P. Xin at NAOC <xlp@bao.ac.cn>
L. P. Xin, X. F. Wang, J. Y. Wei, Y. L. Qiu, J. S. Deng,
J. Wang, X. H. Han and C. Wu on behalf of EAFON report:
We began to observe GRB 150323B (Cumming., GCN 17619; Kienlin., GCN 17623)
with Xinglong 0.8-m TNT telescope at 2015-03-23, 18:19:24(UT),
about 8.85 hour after the Swift trigger time.
No any new source was detected in our 10*300sec coadded image
within the errorbox of BAT (Cumming., GCN 17619),
and the errorbox of two uncatalogured X-ray sources (Avanzo et al., 17632)
down to the 3 sigma limit of 21.8 mag in R-band, calibrated by USNO B1.0 R2 mag,
at the mean time of 9.28 hours after the burst.
We noted that there was a source in USNO B1.0 catalog
( 17:21:50.446 +38:17:00.13 R2=20.5 mag ),
which was located in the errorbox of the Source 2 (Avanzo et al., 17632),
but the variation of its brightness was not decided.
The message may be cited.