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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"

36106 results found.

  1. GRB 260520A: Fermi GBM Final Localization
  2. GRB 260519D: Fermi GBM Final Localization Correction
  3. GRB 260519C: NuSTAR detection of prompt emission
  4. Konus-Wind detection of GRB 260518A
  5. GRB 260519B: Fermi GBM Final Localization
  6. GRB 260519A: Fermi GBM Final Localization
  7. GRB 260518A: AstroSat CZTI detection of a long burst
  8. GRB 260516D: SVOM/ECLAIRs refined analysis
  9. GRB 260515A: SVOM/ECLAIRs refined analysis
  10. GRB 260421B: radio detection with the VLA
  11. GRID detection of GRB 260511A
  12. GRB 260509A: CrAO ZTSh optical upper limit (Duplicate Submission)
  13. GRB 260509A: CrAO ZTSh optical upper limit
  14. GRB 260516D: EP-FXT follow-up observation
  15. GRB 260516D: GOTO optical counterpart detection
  16. GRB 260516D: LCO optical observations
  17. GRB 260515A: further Liverpool Telescope observations
  18. GRB 260516D: SVOM/COLIBRÍ (FM-GFT) optical observations
  19. GRB 260516D: GTC/OSIRIS+ spectroscopic redshift z = 1.801
  20. GRB 260516D: GROWTH-India Telescope optical detection
  21. GRB 260516D: SVOM/VT optical bright candidate
  22. GRB 260516D: FRAM-ORM optical limit
  23. GRB 260515A: CrAO ZTSh BVRI optical observations
  24. Fermi GRB 260516C: Global MASTER-Net observations report
  25. GRB 260516D: SVOM possible detection of a burst
  26. GRB 260516C: Fermi GBM Final Real-time Localization
  27. Konus-Wind detection of GRB 260515A
  28. GRB 260515A: Liverpool Telescope optical detection
  29. GRB 260515A: LCO optical counterpart detection
  30. Fermi Gamma-ray Burst Monitor trigger 800627191/260516518 is not a GRB
  31. GRB 260515A: SVOM/COLIBRÍ (FM-GFT) optical observations
  32. GRB 260515A: EP-FXT follow-up observation
  33. Fermi GRB 260516B: Global MASTER-Net observations report
  34. GRB 260516B: Fermi GBM Final Real-time Localization
  35. Fermi Gamma-ray Burst Monitor trigger 800592653/260516119 is not a GRB
  36. GRB 260515A: SVOM/VT optical observations
  37. GRB 260515A: OHP/T193 optical observations
  38. GRB 260516A: Fermi GBM Final Real-time Localization
  39. GRID detection of GRB 260507A
  40. GRB 260515A: GTC/OSIRIS+ spectroscopic redshift z = 0.764
  41. GRB 260515A: LCO optical observations
  42. SVOM GRB 260515A: Global MASTER-Net observations report
  43. GRB 260515A: NOT optical observations.
  44. SVOM GRB 260515A: MASTER OT J151044.43+243321.7 optical counterpart detection
  45. GRB 260515A: SVOM/VT optical candidate from VHF data
  46. GRB 260515A: JinShan optical counterpart candidate
  47. GRB 260515A: SVOM detection of a burst
  48. GRB 260510C: Glowbug gamma-ray detection
  49. GRB 260511B: NOT optical observations
  50. Konus-Wind detection of GRB 260512A
  51. GRB 260510C: CALET Gamma-Ray Burst Monitor detection
  52. GRB 260511B: GMG Optical Upper Limit
  53. IPN triangulation of GRB 260512A
  54. GRB 260511B: Mephisto multi-band optical followup
  55. Fermi GRB 260514A: Global MASTER-Net observations report
  56. GRB 260512A: AstroSat CZTI detection
  57. GRB 260514A: Fermi GBM Final Real-time Localization
  58. Fermi GRB 260513A: Global MASTER-Net observations report
  59. Fermi GRB 260512A: Global MASTER-Net observations report
  60. GRB 260511B: further SAO RAS optical observations
  61. GRB 260513A: Fermi GBM Final Real-time Localization
  62. GRB 260509A: SVOM/VT optical observations
  63. Konus-Wind detection of GRB 260511B
  64. GRB 260511B: further J-band observations by the SYSU 80 cm infrared telescope
  65. GRB 260511B: Calapai Observatory, Massa S. Giorgio (Messina), optical observation.
  66. GRB 260512A: NuSTAR detection of prompt emission
  67. GRB 260509A: Infrared J and Hs observations with MDM/MIRAGE
  68. GRB 260510C: Infrared J and Hs detections with MDM/MIRAGE
  69. EP260507a: Infrared J and Hs upper limits with MDM/MIRAGE
  70. GRB 260512A: Fermi GBM Final Real-time Localization
  71. GRB 260511A: Glowbug gamma-ray detection
  72. Konus-Wind detection of GRB 260511A
  73. MASS-Cube (GRID 2.0) detection of GRB 260511A
  74. MASS-Cube (GRID 2.0) detection of GRB 260507A
  75. GRB 260511B: SAO RAS optical observations
  76. GRB 260510D: Glowbug gamma-ray detection of a likely short burst
  77. GRB 260511B: FRAM-ORM optical detection
  78. GRB 260511A: EP-FXT follow-up observation
  79. GRB 260511B: EP-FXT follow-up observation
  80. GRB 260511B: LCO optical counterpart detection
  81. GRB260511B: MAO/AZT-22 optical observations
  82. GRB 260511A: SVOM/VT optical observations
  83. GRB 260511B: LCO optical observations
  84. GRB 260511B: OHP/T193 spectroscopic observations
  85. GRB 260511B: GOTO optical counterpart detection
  86. GRB 260511B: Xinglong 2.16m/BEFOSC redshift confirmation
  87. GRB 260510C: SVOM/COLIBRÍ (FM-GFT) further optical observations
  88. GRB 260510A: AstroSat CZTI detection (Erroneous Submission)
  89. GRB 260511B: SVOM/VT optical observations
  90. GRB 260511B: SVOM/COLIBRÍ (FM-GFT) optical observations
  91. GRB 260510B: EP-FXT follow-up observation
  92. GRB 260511B: OSIRIS+/GTC redshift z=2.006
  93. GRB 260510C: Fermi GBM Observation
  94. GRB 260509A: SAO RAS optical observations
  95. GRB 260511A: REM near-infrared detection
  96. GRB 260511B: GROWTH-India Telescope optical observations
  97. GRB 260511B: AstroSat CZTI detection
  98. GRB 260506B: Glowbug gamma-ray detection
  99. GRB 260506A: Glowbug gamma-ray detection of a short burst
  100. GRB 260511B: J-band observations by the SYSU 80 cm infrared telescope

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