J/A+A/692/A3 GRB221009A light curves (Sanchez-Ramirez+, 2024)
Early photometric and spectroscopic observations of the extraordinarily bright
INTEGRAL-detected GRB221009A.
Sanchez-Ramirez R., Lang R.G., Pozanenko A., Martinez-Huerta H., Hu Y.-D.,
Pandey S.B., Gupta R., Ror A.K., Zhang B.-B., Caballero-Garcia M.D.,
Oates S.R., Perez-Garcia I., Guziy S., Fernandez-Garcia E.J., Wu S.-Y.,
Almeida L., Aryan A., Belkin S., Bom C.R., Butner M., Burkhonov O.,
Carrasco-Garcia I., Castellon A., Castro Tirado M.A., Chelovekov I.,
Egamberdiyev Sh.A., Garcia-Benito R., Garcia Gonzalez S.A., Grebenev S.,
Kilpatrick C.D., Klunko E., Makler M., Minaev P., Mkrtchyan A.,
Moskvitin A., Navarete F., Novichonok A., Pankov N., Passas-Varo M.,
Perez del Pulgar C., Reina Terol A., Smith J.A., Tinyanont S., Tucker D.L.,
Uklein R., Volnova A., Wiesner M.P., Gritsevich M., Castro-Tirado A.J.
<Astron. Astrophys. 692, A3 (2024)>
=2024A&A...692A...3S 2024A&A...692A...3S (SIMBAD/NED BibCode)
ADC_Keywords: GRB ; Photometry ; Optical
Keywords: techniques: photometric - techniques: spectroscopic -
gamma-ray burst: general - gamma-ray burst: individual: GRB221009A
Abstract:
GRB221009A, initially detected as an X-ray transient by Swift, was
later revealed to have triggered the Fermi satellite about an hour
earlier, marking it as a post-peak observation of the event's
emission. This GRB distinguished itself as the brightest ever
recorded, presenting an unparalleled opportunity to probe the
complexities of GRB physics. The unprecedented brightness, however,
challenged observation efforts, as it led to the saturation of several
high-energy instruments.
Our study seeks to investigate the nature of the INTEGRAL-detected
GRB221009A and elucidate the environmental conditions conducive to
these exceptionally powerful bursts. Moreover, we aim to understand
the fundamental physics illuminated by the detection of
teraelectronvolt (TeV) photons emitted by GRB221009A.
We conducted detailed analyses of early photometric and spectroscopic
observations that span from the Fermi trigger through to the initial
days following the prompt emission phase in order to characterize
GRB221009A's afterglow, and we complemented these analyses with a
comparative study.
Our findings from analyzing INTEGRAL data confirm GRB221009A as the
most energetic event observed to date. Early optical observations
during the prompt phase negate the presence of bright optical
emissions with internal or external shock origins. Spectroscopic
analyses enabled us to measure GRB221009A's distance and line-of-sight
properties. The afterglow's temporal and spectral analysis suggests
prolonged activity of the central engine and a transition in the
circumburst medium's density. Finally, we discuss the implications
for fundamental physics of detecting photons as energetic as 18 TeV
from GRB221009A.
Early optical observations have proven invaluable for distinguishing
between the potential origins of optical emissions in GRB221009A,
underscoring their utility in GRB physics studies. However, the rarity
of such data underscores the need for dedicated telescopes capable of
synchronous multiwavelength observations. Additionally, our analysis
suggests that the host galaxies of TeV GRBs share commonalities with
those of long and short GRBs. Expanding the sample of TeV GRBs could
further solidify these findings.
Description:
Optical observations of GRB221009A.
Objects:
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RA (2000) DE Designation(s)
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19 13 03.84 +19 46 22.6 GRB221009A = Fermi bn221009553
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 64 175 Optical observations of GRB221009A
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 "datime" STime Start time (UT)
21- 32 F12.5 s T-T0 Time since burst trigger
34- 37 I4 s ExpTime Exposure time
39- 43 A5 --- Filter [BVRI ugriz Clear] Filter
45 A1 --- l_mag Limit flag on mag
46- 50 F5.2 mag mag Magnitude in Filter (AB)
52- 55 F4.2 mag e_mag ? Magnitude in Filter error (AB)
57- 64 A8 --- Tel Telescope
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Acknowledgements:
Ruben Sanchez-Ramirez, ruben.sanchez(at)csic.es
(End) Ruben Sanchez-Ramirez [IAA-CSIC], Patricia Vannier [CDS] 31-Oct-2024