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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

2290 results found.

  1. EP260806a: SAO RAS multicolor optical observations
  2. GRB 260818A: LCO optical upper limits
  3. EP260812a: AbAO optical upper limit
  4. GRB 260818A: SVOM/COLIBRÍ (FM-GFT) optical upper limit
  5. GRB 260810A: Insight-HXMT/HE detection
  6. GRB 260818A: SVOM possible detection of a long and faint GRB
  7. EP260806a: SVOM/ECLAIRs detection through targeted search
  8. EP260806a: NUTTELA-TAO optical observations
  9. The EP-WXT trigger 01709281429 is likely a flaring star
  10. EP260812a: AZT-22 optical upper limit
  11. EP260812b: GTC/OSIRIS+ tentative spectroscopic redshift z = 2.034
  12. EP260806a: WFST optical observations
  13. The EP-WXT trigger 01709280562 is likely a flaring star
  14. EP260812b: Optical upper limit with Kinder
  15. The EP-WXT trigger 01709279838 is likely a flaring star
  16. GRB 260805D: SVOM/GRM detection of a possible magnetar burst
  17. GRB 260808B: Liverpool Telescope further optical observations
  18. GRB 260808B: GTC/OSIRIS+ spectroscopic redshift z = 1.295
  19. GRB 260813A: BALROG localization (Fermi Trigger 808341387 / GRB 260813803)
  20. GRB 260813A: Fermi GBM Final Real-time Localization
  21. EP260812a: NOT and Liverpool Telescope upper limits:
  22. EP260812b: Liverpool Telescope observations
  23. EP260812b: GOTO detection of the optical counterpart
  24. EP260812a: refined analysis of the EP-WXT and autonomous EP-FXT observation
  25. EP260812a: SVOM/C-GFT optical upper limit
  26. EP260812b: COLIBRÍ optical observations
  27. EP260812b: SVOM/VT optical observation
  28. GRB 260808A: SVOM/GRM observation
  29. EP260812b: Einstein Probe detection of an X-ray transient
  30. EP trigger #01709278129 (EP260812b?): NOT optical counterpart
  31. Fermi GBM Sub-Threshold Detection of GRB 260809A
  32. GRB 260810A: Glowbug gamma-ray detection
  33. GRB 260808B: SVOM/COLIBRÍ (FM-GFT) confirmation of the optical rebrightening
  34. GRB 260810A: AstroSat CZTI detection of a long burst
  35. EP260812a: Einstein Probe detection of an X-ray transient
  36. GRB 260809A: SAO RAS optical observations
  37. GRB 260808B: SAO RAS optical observations
  38. GRB 260808B: SVOM/VT optical re-brightening at day 3
  39. GRB 260317A: SVOM/ECLAIRs detection through offline targeted search and its possible association to magnetar 1E 1841-04.5
  40. GRB 260806A: CALET Gamma-Ray Burst Monitor detection
  41. GRB 260808A: GECAM-B observation
  42. EP260806a: MAO/AZT-22 optical observations
  43. IceCube-260807A: Upper limits from a search for additional neutrino events in IceCube
  44. GRB260808B: MAO/AZT-22 optical observations
  45. GRB 260809A: J-band upper limit with WINTER
  46. EP260809a: VLT/X-shooter spectroscopic redshift z = 3.07
  47. GRB 260806A: Glowbug gamma-ray detection
  48. GRB 260808A: CALET Gamma-Ray Burst Monitor detection
  49. GRB 260805C: CALET Gamma-Ray Burst Monitor detection
  50. GRB 260804A: CALET Gamma-Ray Burst Monitor detection
  51. GRB260809A/EPF_J234751.2+210212: EP-FXT follow-up observation
  52. The EP-WXT trigger 01709278015 is likely a flaring star
  53. GRB 260809A: SVOM/COLIBRÍ (FM-GFT) optical observation
  54. GRB 260808B: SVOM/COLIBRÍ (FM-GFT) optical observation
  55. GRB 260809A: NOT optical observations
  56. GRB260809A: MAO/AZT-22 optical observations
  57. IceCube-260805A: Upper limits from a search for additional neutrino events in IceCube
  58. GRB 260809A: SVOM/VT optical counterpart
  59. EP260809a: J-band upper limit with WINTER
  60. GRB 260808B: J-band upper limit with WINTER
  61. GRB 260808B: SVOM/ECLAIRs refined analysis
  62. EP260809a:refined analysis of the EP-WXT and autonomous EP-FXT observation
  63. GRB 260809A: SVOM detection of a faint burst
  64. GRB 260808B: Liverpool Telescope optical observations
  65. GRB 260808B: NOT optical observations
  66. GRB 260808B: LCO optical observations
  67. GRB 260808A: NuSTAR detection of prompt emission
  68. EP260809a: COLIBRÍ optical observations
  69. EP260809a: LCO optical observation
  70. GRB 260808B / EPF_J230056.0+082842: EP-FXT follow-up observation
  71. EP260809a: Einstein Probe detection of an X-ray transient
  72. GRB 260808B: SVOM/VT optical afterglow confirmation
  73. GRB 260808C: Fermi GBM Final Real-time Localization
  74. GRB 260808B: SVOM/VT optical candidate from VHF data ( localization correction for GCN 45317 )
  75. GRB 260808B: SVOM/VT optical candidate from VHF data
  76. GRB 260808B: SVOM detection of a faint burst
  77. GRB 260808A: BALROG localization (Fermi Trigger 807850307 / GRB 260808119)
  78. Fermi GRB 260808A: Global MASTER-Net observations report
  79. GRB 260808A: Fermi GBM Final Real-time Localization
  80. IceCube Alert 260807A: Global MASTER-Net observations report
  81. IceCube-260805A: One candidate from the Zwicky Transient Facility
  82. GRB 260807A: SVOM/COLIBRÍ (FM-GFT) optical upper limit
  83. GRB 260807A: SVOM possible detection of a faint burst
  84. EP260806a: COLIBRÍ optical observations
  85. EP260806a: refined analysis of the EP-WXT and autonomous EP-FXT observations
  86. EP260806a: SVOM/VT optical observation
  87. EP260806a: Liverpool Telescope observations of the counterpart show a blue colour
  88. EP260806a: OSIRIS+/GTC redshift z=0.089
  89. EP260731a: refined analysis of the EP-WXT and autonomous EP-FXT observations
  90. EP260806a: LCO likely optical counterpart
  91. EP260806a: Einstein Probe detection of an X-ray transient
  92. GRB 260715A: cubesat Avion detection
  93. GRB 260709A: cubesat Avion detection
  94. GRB 260708A: cubesat Avion detection
  95. GRB 260730B: Glowbug gamma-ray detection
  96. GRB 260805C: Glowbug gamma-ray detection
  97. GRB 260805B: Glowbug gamma-ray detection
  98. Fermi GRB 260805A: Global MASTER-Net observations report
  99. GRB 260805B: Fermi GBM Final Localization
  100. GRB 260804A: Glowbug gamma-ray detection

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