GammaLib 2.1 release (8 July 2025)

Overview

GammaLib 2.1 is a major release that adds significant functionality.

In particular, this release provides:

  • Faster filling of sparse matrices

  • Weighting cube DRW support for COMPTEL interface

  • Faster INTEGRAL/SPI likelihood computations

Bug fixes

  • [6] - GObservation(s)::nobserved() and GEvents::number() methods return values changed from int to double

  • Fix bug in GModelSpectralTable::par_index

  • [4461] - Fix solidangle computation in GSkyRegionRectangle

  • [4223] - Replace distutils by setuptools for Python setup

  • [4198] - Fix segfault on saving empty GModelSpectralTable instance

Improvements

  • [16] - Add GModelDataMultiplicative class

  • [14] - Improve COMPTEL response computation

  • [13] - Implement SPI specific numerical gradient step size Improve elliptical disk aud Gaussian models Interpret position angle of elliptical models in Galactic system if location is specified in Galactic coordinates

  • [12] - Implement SPI vector response computation Add gammalib::get_current_clock() method

  • [11] - Implement native code for sparse matrix unary addition and subtraction

  • [9] -

    Use sparse vectors in GObservation binned likelihood methods

    Add GVectorSparse class Add GMatrixSparse methods colfill_init(), colfill_set_column() and colfill_flush() Add GMatrixSparse::column_to_vector() method

  • [8] - Add GGti::append(GTimes,GTimes) method

  • [7] - Fix unused parameters in GSPIModelDataSpace::setup_pars() method

  • [5] - Add coordinate string constructor and set() method to GSkyDir class

  • [4] - Write GSPIResponse group name in GSPIObservation::write() method

  • [3] - Add gammalib::get_current_rss() method Implement GSPIModelDataSpace::eval() vector method

  • [2] - Compute scale gradients for composite spatial model

  • [1] - Add GSkyMap scalar multiplication and division Add GCOMResponse::backproject method Do no longer clip negative sky map pixels in GModelSpatialDiffuseMap

  • Add kludge to enable reading of CTA SDC data

  • Extract GMWLObservation attributes from filename

  • Add GEnergy::eV() and GEnergy::log10eV() methods

  • [4467] - Generalise flux computation in GModelSpatial::flux method (#4467)

  • [4209] - Add GSkyMap comparison operators. Add COMPTEL DRW support to GCOMObservation and add GCOMDris class. Add GCOMHkd and GCOMHkds classes.

  • [4204] - Add GIntegral::adaptive_gauss_kronrod() method

  • [4202] - Add optional unit parameter to GApplication::log_value() methods

  • [4159] - Implement response vector cache storage in FITS file

  • Add GCOMObservation::npred() method

  • [4069] - Add optional energy scaling in GModelSpectralTable class and add GNdarray::index() method

New features

Clean up