GRB 201013A: FRAM-ORM possible afterglow candidate
Abstract
report: The 25cm robotic telescope FRAM-ORM at La Palma (Spain) reacted robotically to the alert of GRB201013A (Page et al GCNC 28607), obtaining a series of 20 s unfiltered images starting at 03:47:01.3 UT, i.e. 31.3s post trigger. There is a relatively bright star (R~16.3) within the errorbox of the XRT localization. With the relatively coarse resolution of the 25 cm telescope, direct detection of a faint object within the XRT errorbox is impossible. We performed aperture photometry of the star. There seems to be an excess flux of ~3.5 sigma by ~ 570 s post trigger. This is when optical afterglows often show maxima in their lightcurves. We also performed image subtraction of a sum of four images obtained at the time of the detected peak and twelve latest images of the series. The resulting frame contains a very weak residual towards the position of the X-ray afterglow from the star center. We therefore conclude that there is a slight possibility of an afterglow peaking at R~17.0, which was outshined by a nearby star of R~16.3.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- October 2020
- Bibcode:
- 2020GCN.28615....1J