GCN Circular 42709

Subject

GRB 251116B: EP-FXT follow-up observation

Event

GRB 251116B

Date

2025-11-17T03:44:02Z (6 days ago)

From

EP Team at NAOC/CAS <ep_ta@bao.ac.cn>

Via

Web form

D.Y. Li, G. J. Yang, C. L. Guo (NAO, CAS), D. Z. Du (ZJU), R. X. Hu (WHU), Q. J. Huang(PMO, CAS), Y. Liu (NAO, CAS) on behalf of the Einstein Probe (EP) team:

EP-FXT performed a follow-up observation of the SVOM/ECLAIRs-detected burst GRB 251116B (SVOM/sb25111604, Pillas et al., GCN #42702Loading...
 
 ) at 2025-11-16 17:13:25 (UTC), about 1.7 hours after the SVOM/ECLAIRs trigger, with an exposure time of 5832s. Six uncataloged sources are detected within the ECLAIRs error circle. Preliminary analysis on these sources is automatically conducted, and the details are listed as follows. 

EPF_J011551.9-410700
RA (J2000): 18.9664
Dec (J2000): -41.1167
Flux: 5.54 x 10^-14 erg/s/cm2 (observed, 0.5-10 keV)
Flux_err: 1.68 x 10^-14 erg/s/cm2 (1 sigma)

EPF_J011518.5-405816
RA (J2000): 18.8272
Dec (J2000): -40.971
Flux: 1.35 x 10^-13 erg/s/cm2 (observed, 0.5-10 keV)
Flux_err: 4.97 x 10^-14 erg/s/cm2 (1 sigma)

EPF_J011442.3-410511
RA (J2000): 18.6761
Dec (J2000): -41.0863 
Flux: 4.54 x 10^-14 erg/s/cm2 (observed, 0.5-10 keV)
Flux_err: 1.58 x 10^-14 erg/s/cm2 (1 sigma)

EPF_J011604.1-410246
RA (J2000): 19.0172
Dec (J2000): -41.0461
Flux: 6.74 x 10^-14 erg/s/cm2 (observed, 0.5-10 keV)
Flux_err: 1.73 x 10^-14 erg/s/cm2 (1 sigma)

EPF_J011523.3-410250
RA (J2000): 18.8471
Dec (J2000): -41.0471
Flux: 6.72 x 10^-14 erg/s/cm2 (observed, 0.5-10 keV)
Flux_err: 2.29 x 10^-14 erg/s/cm2 (1 sigma)

EPF_J011535.7-410502
RA (J2000): 18.8988
Dec (J2000): -41.0839
Flux: 7.66 x 10^-14 erg/s/cm2 (observed, 0.5-10 keV)
Flux_err: 1.59x 10^-14 erg/s/cm2 (1 sigma)