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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"

37562 results found.

  1. GRB 260526A: Fermi GBM Final Real-time Localization
  2. Fermi GRB 260525A: Global MASTER-Net observations report
  3. GRB 260525A: Fermi GBM Final Real-time Localization
  4. GRB 260523B: AstroSat CZTI detection
  5. GRB 260523B: GECAM-B observation
  6. Fermi GRB 260523A: Global MASTER-Net observations report
  7. GRB 260523B: Fermi GBM Final Real-time Localization
  8. GRB 260523A: Fermi GBM Final Real-time Localization
  9. GRB 260522A: Fermi GBM Observation
  10. GRB 260522B: NuSTAR detection of prompt emission
  11. GRB 260522B: Fermi GBM Final Real-time Localization
  12. GRB 260522A: GOTO optical upper limit
  13. Fermi trigger No 801135305: Global MASTER-Net observations report
  14. Fermi GRB 260522A: Global MASTER-Net observations report
  15. GRB 260522A: Fermi-LAT detection
  16. GRB 260519C: SVOM/GRM observation
  17. GRB 260522A: Fermi GBM Final Real-time Localization
  18. GRB 260511A: iTelescope T-75 optical detection
  19. GRB 260520B: SVOM/GRM observation
  20. GRB 260411B: TERI Gamma-ray detection
  21. GRB 260407A: TERI Gamma-ray detection
  22. GRB 260307A: TERI Gamma-ray detection
  23. GRB 260225D: TERI Gamma-ray detection
  24. GRB 251118A: TERI Gamma-ray detection
  25. GRB 251113A: TERI Gamma-ray detection
  26. GRB 260428A: TERI Gamma-ray detection
  27. Konus-Wind detection of GRB 260519C
  28. GRB 260520B: Fermi GBM Final Localization
  29. GRB 260509A: SVOM/ECLAIRs refined analysis
  30. GRB 260520A: Fermi GBM Final Localization
  31. GRB 260519D: Fermi GBM Final Localization Correction
  32. GRB 260519C: NuSTAR detection of prompt emission
  33. Konus-Wind detection of GRB 260518A
  34. GRB 260519B: Fermi GBM Final Localization
  35. GRB 260519A: Fermi GBM Final Localization
  36. GRB 260518A: AstroSat CZTI detection of a long burst
  37. GRB 260516D: SVOM/ECLAIRs refined analysis
  38. GRB 260515A: SVOM/ECLAIRs refined analysis
  39. GRB 260421B: radio detection with the VLA
  40. GRID detection of GRB 260511A
  41. GRB 260509A: CrAO ZTSh optical upper limit (Duplicate Submission)
  42. GRB 260509A: CrAO ZTSh optical upper limit
  43. GRB 260516D: EP-FXT follow-up observation
  44. GRB 260516D: GOTO optical counterpart detection
  45. GRB 260516D: LCO optical observations
  46. GRB 260515A: further Liverpool Telescope observations
  47. GRB 260516D: SVOM/COLIBRÍ (FM-GFT) optical observations
  48. GRB 260516D: GTC/OSIRIS+ spectroscopic redshift z = 1.801
  49. GRB 260516D: GROWTH-India Telescope optical detection
  50. GRB 260516D: SVOM/VT optical bright candidate
  51. GRB 260516D: FRAM-ORM optical limit
  52. GRB 260515A: CrAO ZTSh BVRI optical observations
  53. Fermi GRB 260516C: Global MASTER-Net observations report
  54. GRB 260516D: SVOM possible detection of a burst
  55. GRB 260516C: Fermi GBM Final Real-time Localization
  56. Konus-Wind detection of GRB 260515A
  57. GRB 260515A: Liverpool Telescope optical detection
  58. GRB 260515A: LCO optical counterpart detection
  59. Fermi Gamma-ray Burst Monitor trigger 800627191/260516518 is not a GRB
  60. GRB 260515A: SVOM/COLIBRÍ (FM-GFT) optical observations
  61. GRB 260515A: EP-FXT follow-up observation
  62. Fermi GRB 260516B: Global MASTER-Net observations report
  63. GRB 260516B: Fermi GBM Final Real-time Localization
  64. Fermi Gamma-ray Burst Monitor trigger 800592653/260516119 is not a GRB
  65. GRB 260515A: SVOM/VT optical observations
  66. GRB 260515A: OHP/T193 optical observations
  67. GRB 260516A: Fermi GBM Final Real-time Localization
  68. GRID detection of GRB 260507A
  69. GRB 260515A: GTC/OSIRIS+ spectroscopic redshift z = 0.764
  70. GRB 260515A: LCO optical observations
  71. SVOM GRB 260515A: Global MASTER-Net observations report
  72. GRB 260515A: NOT optical observations.
  73. SVOM GRB 260515A: MASTER OT J151044.43+243321.7 optical counterpart detection
  74. GRB 260515A: SVOM/VT optical candidate from VHF data
  75. GRB 260515A: JinShan optical counterpart candidate
  76. GRB 260515A: SVOM detection of a burst
  77. GRB 260510C: Glowbug gamma-ray detection
  78. GRB 260511B: NOT optical observations
  79. Konus-Wind detection of GRB 260512A
  80. GRB 260510C: CALET Gamma-Ray Burst Monitor detection
  81. GRB 260511B: GMG Optical Upper Limit
  82. IPN triangulation of GRB 260512A
  83. GRB 260511B: Mephisto multi-band optical followup
  84. Fermi GRB 260514A: Global MASTER-Net observations report
  85. GRB 260512A: AstroSat CZTI detection
  86. GRB 260514A: Fermi GBM Final Real-time Localization
  87. Fermi GRB 260513A: Global MASTER-Net observations report
  88. Fermi GRB 260512A: Global MASTER-Net observations report
  89. GRB 260511B: further SAO RAS optical observations
  90. GRB 260513A: Fermi GBM Final Real-time Localization
  91. GRB 260509A: SVOM/VT optical observations
  92. Konus-Wind detection of GRB 260511B
  93. GRB 260511B: further J-band observations by the SYSU 80 cm infrared telescope
  94. GRB 260511B: Calapai Observatory, Massa S. Giorgio (Messina), optical observation.
  95. GRB 260512A: NuSTAR detection of prompt emission
  96. GRB 260509A: Infrared J and Hs observations with MDM/MIRAGE
  97. GRB 260510C: Infrared J and Hs detections with MDM/MIRAGE
  98. EP260507a: Infrared J and Hs upper limits with MDM/MIRAGE
  99. GRB 260512A: Fermi GBM Final Real-time Localization
  100. GRB 260511A: Glowbug gamma-ray detection

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