NICER observation list: Target ID 255005
- Proposal Number = 2550
- Target ID = 255005
- Target Name = XTE_J1728-295
- Proposal Title = THE NATURE AND ACCRETION FLOW PROPERTIES OF SUB-LUMINOUS X-RAY BINARIES
- PI = JAKOB VAN DEN EIJNDEN
- Proposal Category = X-RAY PULSARS AND NEUTRON STARS
- Cycle number = 2
- Observation Type = NOR
Abstract
Very-faint X-ray transients undergo outbursts of accretion with a peak X-ray luminosity much lower than that of other black hole and neutron star low-mass X-ray binaries. Studying these objects is of great interest because they trace a poorly understood accretion regime and may represent neutron stars with relatively strong magnetic fields or a missing population of short-period binaries. To study the outburst of a known very-faint X-ray transient in detail, we propose 40 ks of NICER ToO monitoring observations, divided into 20 observations of 2 ks spanning two months. These observations will allow us to i) perform the first dedicated, multi-epoch timing study of a VFXT outburst and ii) monitor the spectral and flux evolution of the target.
| Obsid |
RA |
DEC |
l |
b |
Start |
End |
Exposure |
Number of
Modules |
Number of
Processing |
Status of
Processing |
Date of
Processing |
Public
date |
| 2550050101 |
262.166 |
-29.364 |
357.652 |
2.894 |
58624.9679 |
58624.9792 |
868.0 |
52 |
3 |
VALIDATED |
58631.7 |
58638 |
| 2550050102 |
262.165 |
-29.363 |
357.652 |
2.896 |
58625.0323 |
58625.1731 |
2152.0 |
52 |
2 |
VALIDATED |
58631.8 |
58639 |