# Foreground of GRBs from AKARI FIS data

## TL;DR

This paper demonstrates that AKARI FIS data can effectively reveal fine structures of galactic foregrounds in GRB observations, providing an alternative method to estimate extinction with high resolution.

## Contribution

The study introduces the use of AKARI FIS sky brightness maps to analyze galactic foregrounds of GRBs, offering a new high-resolution approach compared to existing methods.

## Key findings

- AKARI FIS maps reveal detailed galactic cirrus structures around GRBs.
- Comparison shows AKARI data aligns with other extinction estimation methods.
- High-resolution foreground mapping improves GRB afterglow analysis.

## Abstract

A significant number of the parameters of a gamma-ray burst (GRB) and its host galaxy are calculated from the afterglow. There are various methods obtaining extinction values for the necessary correction for galactic foreground. These are: galaxy counts, from HI 21 cm surveys, from spectroscopic measurements and colors of nearby Galactic stars, or using extinction maps calculated from infrared surveys towards the GRB. We demonstrate that AKARI Far-Infrared Surveyor sky surface brightness maps are useful uncovering the fine structure of the galactic foreground of GRBs. Galactic cirrus structures of a number of GRBs are calculated with a 2 arcminute resolution, and the results are compared to that of other methods.