GRB 151229B

Last updated: 01/12/2016

The figure below shows the 3\,\sigma error box of the GRB localized by the InterPlanetary Network (IPN), and all galaxies in the GLADE catalog within a \pm\, 0.2^{\circ} environment from its edges along both axes. Numbers in the plot indicate distances of the galaxies in megaparsecs.

For more details about the GRB and its localization, check out the corresponding GCN Circular where the GRB data was taken from.

Symbols in the plot represent different methods for distance measurement:

blue + distance calculated from spectroscopic redshift (2MPZ)
green x distance calculated from photometric redshift (2MPZ)
red ☐ distance estimated with a random forest machine learning technique based on 2MASS J, H, and Ks magnitudes (GLADE)
orange O distance derived using various other methods (GWGC or HyperLEDA; see GLADE documentation for more details)

We use cosmological parameters H_0=70 \ \mathrm{km}\ \mathrm{s}^{-1}\ \mathrm{Mpc}^{-1}}, \Omega_{\mathrm{M}}=0.3 and \Omega_{\Lambda}=0.7 when calculating a distance from redshift.
Sky area near the 90% error box of 151229B

We have identified 135 galaxies inside the error box. distances of these galaxies are 24 Mpc, 65 Mpc, 69 Mpc, 124 Mpc, 134 Mpc, 136 Mpc, 136 Mpc, 139 Mpc, 146 Mpc, 165 Mpc, 166 Mpc, 172 Mpc, 175 Mpc, 176 Mpc, 178 Mpc, 185 Mpc, 189 Mpc, 204 Mpc, 206 Mpc, 218 Mpc, 224 Mpc, 238 Mpc, 238 Mpc, 245 Mpc, 247 Mpc, 250 Mpc, 264 Mpc, 268 Mpc, 271 Mpc, 275 Mpc, 289 Mpc, 297 Mpc, 303 Mpc, 303 Mpc, 303 Mpc, 312 Mpc, 322 Mpc, 323 Mpc, 324 Mpc, 326 Mpc, 330 Mpc, 333 Mpc, 335 Mpc, 339 Mpc, 351 Mpc, 354 Mpc, 355 Mpc, 358 Mpc, 358 Mpc, 359 Mpc, 363 Mpc, 364 Mpc, 377 Mpc, 380 Mpc, 393 Mpc, 395 Mpc, 404 Mpc, 406 Mpc, 410 Mpc, 413 Mpc, 418 Mpc, 420 Mpc, 424 Mpc, 426 Mpc, 427 Mpc, 430 Mpc, 436 Mpc, 437 Mpc, 438 Mpc, 441 Mpc, 445 Mpc, 464 Mpc, 464 Mpc, 465 Mpc, 465 Mpc, 468 Mpc, 472 Mpc, 482 Mpc, 482 Mpc, 482 Mpc, 487 Mpc, 493 Mpc, 496 Mpc, 499 Mpc, 509 Mpc, 513 Mpc, 524 Mpc, 532 Mpc, 539 Mpc, 549 Mpc, 558 Mpc, 558 Mpc, 569 Mpc, 590 Mpc, 601 Mpc, 615 Mpc, 620 Mpc, 635 Mpc, 642 Mpc, 649 Mpc, 681 Mpc, 688 Mpc, 688 Mpc, 690 Mpc, 696 Mpc, 708 Mpc, 714 Mpc, 726 Mpc, 737 Mpc, 739 Mpc, 739 Mpc, 742 Mpc, 742 Mpc, 762 Mpc, 762 Mpc, 794 Mpc, 799 Mpc, 802 Mpc, 809 Mpc, 831 Mpc, 841 Mpc, 869 Mpc, 925 Mpc, 928 Mpc, 928 Mpc, 941 Mpc, 957 Mpc, 972 Mpc, 984 Mpc, 992 Mpc, 1036 Mpc, 1043 Mpc, 1064 Mpc, 1356 Mpc and 1364 Mpc.

This event was classified as a long GRB. Nevertheless, assuming that the event is a short GRB, we can identify 14 galaxies outside the error box from which a pair of merging neutron stars (BNSs) could have kicked out from to reach a position inside the GRB error box. Parameters of these galaxies are listed in the table below. Note that we have identified these galaxies as the ones being within a 100 kpc radius outside the GRB error box. According to Fong & Berger 2013, 95% of all binary neutron stars kicked out from a galaxy should merge within a 100 kpc range around its host.



D [Mpc] α [deg] R [kpc] P [%]
8060.000278.336
9550.001229.961
4590.001832.748
3800.0032011.933
4690.005376.403
9320.00696<2
4790.009763.083
1510.010278.699
1350.013308.011
3390.015872.442
750.033435.025
720.053663.665
14.163733.257


D [Mpc]: Distance of the galaxy in Mpc.
α [deg]: Angular distance of the galaxy from the error box in degrees.
R [kpc]: Projected distance of the galaxy from the error box in kpc.
P [%]: Probability that a BNS kicked out from the galaxy reaches a projected distance R before the merger. We calculated P using the observed distribution of projected physical offsets of short GRBs from their host galaxies, shown in Fig. 5 of Fong & Berger 2013. Note, that in order to have a BNS merge inside the error box with probability P, one must assume that the kick occurred towards the closest point of the error box from the galaxy center.


Click HERE if you want to download all GLADE parameters of galaxies shown in the figure. Each row in the linked ascii file correspond to a galaxy indicated in the plot. For an explanation on what different columns represent, click HERE.