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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"

42804 results found.

  1. GRB 260509A: CrAO ZTSh optical upper limit (Duplicate Submission)
  2. GRB 260509A: CrAO ZTSh optical upper limit
  3. GRB 260516D: EP-FXT follow-up observation
  4. GRB 260516D: GOTO optical counterpart detection
  5. GRB 260516D: LCO optical observations
  6. GRB 260515A: further Liverpool Telescope observations
  7. GRB 260516D: GTC/OSIRIS+ spectroscopic redshift z = 1.801
  8. GRB 260516D: GROWTH-India Telescope optical detection
  9. GRB 260516D: SVOM/VT optical bright candidate
  10. GRB 260516D: FRAM-ORM optical limit
  11. GRB 260515A: CrAO ZTSh BVRI optical observations
  12. Fermi GRB 260516C: Global MASTER-Net observations report
  13. SVOM GRB260516D: Global MASTER-Net observations report
  14. GRB 260516D: SVOM possible detection of a burst
  15. GRB 260516C: Fermi GBM Final Real-time Localization
  16. Konus-Wind detection of GRB 260515A
  17. GRB 260515A: Liverpool Telescope optical detection
  18. GRB 260515A: LCO optical counterpart detection
  19. Fermi Gamma-ray Burst Monitor trigger 800627191/260516518 is not a GRB
  20. GRB 260515A: EP-FXT follow-up observation
  21. EP260514a: refined analysis of the EP-WXT and follow-up EP-FXT observations
  22. EP260514a: NOT optical counterpart confirmation
  23. EP260514a: TRT optical counterpart candidate
  24. EP260514a: SVOM/VT optical candidate
  25. Fermi GRB 260516B: Global MASTER-Net observations report
  26. GRB 260516B: Fermi GBM Final Real-time Localization
  27. Fermi Gamma-ray Burst Monitor trigger 800592653/260516119 is not a GRB
  28. GRB 260515A: SVOM/VT optical observations
  29. GRB 260515A: OHP/T193 optical observations
  30. GRB 260516A: Fermi GBM Final Real-time Localization
  31. GRID detection of GRB 260507A
  32. GRB 260515A: GTC/OSIRIS+ spectroscopic redshift z = 0.764
  33. GRB 260515A: LCO optical observations
  34. SVOM GRB 260515A: Global MASTER-Net observations report
  35. GRB 260515A: NOT optical observations.
  36. SVOM GRB 260515A: MASTER OT J151044.43+243321.7 optical counterpart detection
  37. GRB 260515A: SVOM/VT optical candidate from VHF data
  38. GRB 260515A: JinShan optical counterpart candidate
  39. GRB 260515A: SVOM detection of a burst
  40. GRB 260510C: Glowbug gamma-ray detection
  41. IceCube-260504A: No Candidate Transients from the Zwicky Transient Facility
  42. EP260514a: GROWTH-India Telescope optical upper limit
  43. GRB 260511B: NOT optical observations
  44. Konus-Wind detection of GRB 260512A
  45. GRB 260510C: CALET Gamma-Ray Burst Monitor detection
  46. EP260514a: Global MASTER-Net observations report
  47. EP260514a: Einstein Probe detection of a fast X-ray transient
  48. EP260512a: LCO optical upper limits
  49. IPN triangulation of GRB 260512A
  50. GRB 260511B: Mephisto multi-band optical followup
  51. Fermi GRB 260514A: Global MASTER-Net observations report
  52. GRB 260512A: AstroSat CZTI detection
  53. The EP-WXT trigger 01709262077 is likely a flaring star
  54. EP260512a: EP-FXT follow-up observation
  55. EP260507a: Xinglong Schmidt optical counterpart detection
  56. GRB 260514A: Fermi GBM Final Real-time Localization
  57. EP260512a: Global MASTER-Net observations report
  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. The EP-WXT trigger 01709262036 is likely a flaring star
  65. EP260512a: Einstein Probe detection of an X-ray transient
  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 260511B: SVOM/VT optical observations
  88. GRB 260511B: SVOM/COLIBRÍ (FM-GFT) optical observations
  89. GRB 260510B: EP-FXT follow-up observation
  90. GRB 260511B: OSIRIS+/GTC redshift z=2.006
  91. GRB 260510C: Fermi GBM Observation
  92. GRB 260509A: SAO RAS optical observations
  93. GRB 260511A: REM near-infrared detection
  94. GRB 260511B: GROWTH-India Telescope optical observations
  95. GRB 260511B: AstroSat CZTI detection
  96. GRB 260506B: Glowbug gamma-ray detection
  97. GRB 260506A: Glowbug gamma-ray detection of a short burst
  98. GRB 260511B: J-band observations by the SYSU 80 cm infrared telescope
  99. GRB 260511B: NuSTAR detection of prompt emission
  100. GRB 260511A: NuSTAR detection of prompt emission

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