GCN Circular 36177

Tian-Rui Sun, Jin-Jun Geng, Jian Chen, Yan-Long Hua  and Lei Hu report on behalf of the YAHPT team:

Following the detection of GRB 240418A by SWIFT (Siegel et al., GCN 36162
Not found
 
 
; Evans et al., GCN 36166
Not found
 
 
), 
we use the Yaoan High Precision Telescope at Yaoan Astronomy Observation Station (Yunnan province, China) to search and follow up its afterglow at XRT position.

We observed the target position with 180s exposure in V-band starting from 2024-04-18T20:32:14.600 about 486.6 seconds after the burst.
We took 25 images with total exposure time of 4500 seconds from 20:32:14 to 21:48:29.4. 
We did not detect any object up to V = 22.2 with the stacked images within the Enhanced Swift XRT position 
This non-detection results of the gamma-ray bursts is in agreement with the previous circulars 
(Lipunov et al., GCN 36163
Not found
 
 
; Odeh et al., GCN 36165
Not found
 
 
; Malesani et al., GCN 36167
Not found
 
 
; Pozanenko et al. GCN 36168
Not found
 
 
;).

We used the UCAC4 catalog (Vmag) as the magnitude reference for calibration.