EP240426a
GCN Circular 36315
Subject
EP240426a: GMG optical upper limit
Date
2024-04-26T14:10:11Z (a year ago)
From
wangbaiting@ynao.ac.cn
Via
Web form
B.-T. Wang, R.-Z. Li, J. Mao, L.-Y. Zhu, Y.-Z. Cai, J.-M. Bai (YNAO) report:
We observed the field of EP-FXT detection of the candidate conterpart EP 2406026a (Sun et al. GCN 36313) by the GMG-2.4m telescope at the Lijiang station in Yunnan Observatories. The observation began at 2024-04-26T12:37:20. No optical counterpart was detected within the EP-FXT error circle.
The very preliminary upper limit can be given i>18.7.
GCN Circular 36322
Subject
XMM-Newton observation of EP240426a
Date
2024-04-26T16:45:04Z (a year ago)
From
Norbert Schartel at XMM-Newton/ESA <xmmtoo@sciops.esa.int>
Via
email
XMM-Newton has scheduled an observation of the field of EP240426a, the
potential X-ray counterpart of S240422ed (The LIGO-Virgo-KAGRA
Collaboration, GCN 36236) reported in GCN 36313,
at location RA=08h07m25.61s, Dec=-29d27'39.2'', starting at 20:10
UT, on April 26 2024, for an exposure time of 45 ks.
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GCN Circular 36323
Subject
EP240426a: YAHPT optical upper limit
Date
2024-04-26T16:57:35Z (a year ago)
From
Tianrui Sun at Purple Mountain Obs,CAS <trsun@pmo.ac.cn>
Via
Web form
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 EP240426a by Einstein Probe (Sun et al., GCN 36313),
we use the Yaoan High Precision Telescope at Yaoan Astronomy Observation Station (Yunnan province, China) to search and follow up.
We observed the target position in both Rc and Ic starting from 2024-04-26T12:47:25.100 with 300s exposure.
We did not detect any possible new optical counterpart with an uncertainty of 10 arcsec in the coadded image.
UT (start) |5 sigma Upper Limit| Exposure Time | Filter
2024-04-26T12:47:25.100| 21.26 | 300*8s | Rc
2024-04-26T12:42:22.700| 21.12 | 300*8s | Ic
This non-detection result of the transient is in agreement with the previous circulars (Wang et al., 36315; Xiong et al.,36320).
We used the USNO B1.0 catalogue (R2mag and Imag) as the magnitude reference for calibration.