Preprint

Earliest simultaneous multi-color optical observations of GRB 230328B: from 41 seconds to the host-galaxy identification

T. KomeshA. PozanenkoSpace Research Institute , Russian Academy of Sciences , Moscow 117997 , RussiaN. PankovA. VolnovaSpace Research Institute , Russian Academy of Sciences , Moscow 117997 , RussiaP. MinaevSpace Research Institute , Russian Academy of Sciences , Moscow 117997 , RussiaR. GillAstrophysics Research Center of the Open university (ARCO) , The Open University of Israel , PO Box 808 , Ra'anana 4353701 , IsraelD. BerdikhanEnergetic Cosmos Laboratory , Nazarbayev University , Astana 010000 , KazakhstanB. GrossanEnergetic Cosmos Laboratory , Nazarbayev University , Astana 010000 , KazakhstanZ. MaksutZ. AbdullayevNational Astronomical Observatories , Chinese Academy of Sci- ences , Beijing 100101 , ChinaS. BelkinSchool of Physics & Astronomy , Monash University , Clayton VIC 3800 , AustraliaM. KrugovFesenkov Astrophysical Institute , Almaty , 050020 , KazakhstanA. MoskvitinSpecial Astrophysical Observatory , Russian Academy of Sciences , Nizhny Arkhyz 369167 , RussiaK. BaigarinEnergetic Cosmos Laboratory , Nazarbayev University , Astana 010000 , KazakhstanA. TursynkanDepartment of Physics , Nazarbayev University , 53 Kabanbay Batyr ave , Astana 010000 , KazakhstanE. KlunkoInstitute of Solar-Terrestrial Physics , Russian Academy of Sciences (Siberian Branch) , Irkutsk 664033 , RussiaA. TatarnikovLomonosov Moscow State University , Moscow 119991 , RussiaS. ZheltoukhovLomonosov Moscow State University , Moscow 119991 , RussiaV. RumyantsevCrimean Astrophysical Observatory , Russian Academy of Sci- ences , Nauchny 298409 , CrimeaA. VolvachCrimean Astrophysical Observatory , Russian Academy of Sci- ences , Nauchny 298409 , CrimeaL. VolvachCrimean Astrophysical Observatory , Russian Academy of Sci- ences , Nauchny 298409 , CrimeaO. A. BurkhonovUlugh Beg Astronomical Institute , Uzbekistan Academy of Sci- ences , Tashkent 100052 , UzbekistanS. A. EhgamberdievSamarkand State University , 15 , University boulevard , Samarkand 140104 , UzbekistanR. InasaridzeEvgeni Kharadze Georgian National Astrophysical Observatory , Abastumani-Kanobili 0301 , GeorgiaL. EleninKeldysh Institute of Applied Mathematics of the Russian Academy of Sciences , Moscow 125047 , RussiaA. KrylovKeldysh Institute of Applied Mathematics of the Russian Academy of Sciences , Moscow 125047 , RussiaM. ZheltobryukhovInstitute of Applied Astronomy of Russian Academy of Science , 10 Kutuzova Emb. , Saint-Petersburg 191187 , RussiaS. B. PandeyAryabhatta Research Institute of Observational Sciences (ARIES) , Manora Peak , Nainital , Uttarakhand 263001 , IndiaA. K. RorAryabhatta Research Institute of Observational Sciences (ARIES) , Manora Peak , Nainital , Uttarakhand 263001 , IndiaR. GuptaNASA Postdoctoral Program FellowV. SwainDepartment of Physics , Indian Institute of Technology Bombay , Powai , 400 076 , IndiaV. BhaleraoDepartment of Physics , Indian Institute of Technology Bombay , Powai , 400 076 , IndiaG. C. AnupamaIndian Institute of Astrophysics , 2nd Block 100 Feet Rd , Koraman- gala Bangalore , 560 034 , IndiaS. BarwayIndian Institute of Astrophysics , 2nd Block 100 Feet Rd , Koraman- gala Bangalore , 560 034 , IndiaR. Sánchez-RamírezInstituto de Astrofísica de Andalucía -CSIC , Glorieta de la As- tronomía s/n , E-18008 Granada , SpainA. J. Castro-TiradoEx-Hda . San José de la Huerta , Morelia , Michoacán , C.P. 58089 , MéxicoS. AntierLaboratoire de Physique des 2 Infinis Irène Joliot-CurieP. BeniaminiE. AbdikamalovDepartment of Physics , Nazarbayev University , 53 Kabanbay Batyr ave , Astana 010000 , Kazakhstan

2026

ABI

Annotatsiya

We present a multi-wavelength analysis of the long-duration gamma-ray burst GRB 230328B. Fermi/GBM observations reveal a typical Type II burst with a duration of about 22 s. Using a photometric redshift of about 1.5 derived from the host galaxy, we find that the burst energetics, with an isotropic-equivalent energy of about 6.4*10^52 erg, are consistent with established empirical correlations for long gamma-ray bursts. The optical, X-ray, and radio afterglow exhibits a complex temporal evolution, featuring an early onset bump followed by a pronounced late-time achromatic rebrightening at about 4000 s. Through MCMC modeling, we find that the afterglow can be explained by forward shock emission with late energy injection. Broadband spectral energy distribution fitting reveals significant line-of-sight dust extinction, corresponding to a visual extinction of about 0.8 magnitudes, consistent with Milky Way or Large Magellanic Cloud dust properties. The burst originated in a relatively young, highly absorbed S0-type host galaxy, whose morphological analysis suggests that it may be part of a system of interacting galaxies. Finally, late-time optical monitoring reveals no signature of an accompanying supernova.

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