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GCN Circular 14337

GRB 130327A: ISON-NM optical upper limit
2013-03-27T09:59:23Z (11 years ago)
Alexei Pozanenko at IKI, Moscow <>
L. Elenin (KIAM), A. Volnova (SAI MSU), I. Molotov (KIAM), A. Pozanenko 
(IKI) report on behalf of  larger GRB  follow-up collaboration:

We observed the field of  the Swift GRB 130327A (Ukwatta, et al., GCN 
14331) with 0.45-m telescope of ISON-NM observatory  on Mar. 27, 
between (UT) 02:44:04 - 03:27:54.  We took  several unfiltered images of 
30 s exposures.  Within enhanced XRT afterglow position (Osborne et al., 
GCN 14335) we do not detect any new object.  We marginally (S/N~2.5, R~ 
20.3)  detected "second uncatalogued source" (Morgan et al., GCN 14333; 
Butler et al., GCN 14334) at RA , DEC (J2000): 06 08 09.06 +55 42 48.5. 
  A photometry of combined  image is based  on the USNO-B1.0 (R2) 
nearby  stars

  Start,   T0+,          Exposure,  OT,    UL (3 sigma)
  (UT)     mid, d         (s)

02:44:04  0.0546        60x30      n/d    20.0
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