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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"

14980 results found.

  1. GRB 200530A: Fermi GBM detection
  2. GRB 200530A: CALET Gamma-Ray Burst Monitor detection
  3. GRB 200605A: Fermi GBM Final Real-time Localization
  4. GRB 200530A: Fermi-LAT detection
  5. GRB 200604A: AstroSat CZTI detection
  6. GRB 200604A: Fermi GBM Final Real-time Localization
  7. Swift detection of an SGR-like burst from 1RXS J1708−4009
  8. Konus-Wind observation of GRB200528A
  9. GRB 200601A: Insight-HXMT/HE detection
  10. GRB 200601A: Fermi GBM Final Real-time Localization
  11. IceCube-200530A: No significant detection in HAWC
  12. IceCube-200530A: No ANTARES neutrino counterpart
  13. GRB 200531A: Fermi GBM Final Real-time Localization
  14. Konus-Wind observation of GRB 200524A
  15. IceCube-200530A - IceCube observation of a high-energy neutrino candidate event
  16. GRB 200530A: AstroSat CZTI detection
  17. GRB 200530A: Fermi GBM Final Real-time Localization
  18. GRB 200528A: CAHA Upper Limit
  19. GRB 200529A: Fermi GBM Detection
  20. GRB 200529A: LCO Optical Afterglow Detection
  21. GRB 200528A: CALET Gamma-Ray Burst Monitor detection
  22. GRB 200529B: Fermi GBM Final Real-time Localization
  23. GRB 200529A: KAIT Optical Afterglow Confirmation
  24. GRB 200529A: Swift detection of a burst
  25. GRB 200529A: Fermi GBM Final Real-time Localization
  26. GRB 200528A: Potential host galaxy in PanSTARRS, SDSS and WISE
  27. GRB 200528A: Swift detection of a burst
  28. GRB 200528A: Fermi GBM Final Real-time Localization
  29. GRB 200522A: HST F125W new point source detection
  30. GRB 200522A: Hubble Space Telescope Near-IR F160W Observations
  31. GRB200524A: UVOT detection
  32. GRB 200524A: optical upper limits from further MITSuME Akeno observation
  33. GRB 200525A: Fermi GBM Final Real-time Localization
  34. GRB 200524A: AstroSat CZTI detection
  35. GRB 200524A: Further Liverpool Telescope observations
  36. GRB200521A: ASIM observation
  37. GRB 200524A: KAIT Optical Observations
  38. GRB 200524A: MITSuME Akeno optical observation
  39. GRB 200524A: Swift-XRT afterglow detection
  40. GRB 200524A: OAJ multicolor afterglow detection
  41. GRB 200524A: Fermi GBM detection
  42. GRB 200524A: CAHA multicolor afterglow detection
  43. ZTF Discovery of ZTF20abbiixp: The Likely Optical Afterglow to GRB 200524A
  44. GRB 200524A: Fermi-LAT detection
  45. Konus-Wind detection of short/hard GRB 200521A
  46. IPN triangulation of GRB 200521A (short)
  47. GRB 200522A: LCO Optical Afterglow Detection
  48. CGBM-SPI-ACS triangulation of short GRB 200521A
  49. IceCube-200523A - IceCube observation of a high-energy neutrino candidate event
  50. GRB 200522A: 6 GHz VLA radio source detection
  51. GRB 200522B: Fermi GBM Final Real-time Localization
  52. GRB 200522A: Swift detection of a short burst
  53. GRB 200521A: CALET Gamma-Ray Burst Monitor detection
  54. GRB 200521A: AGILE/MCAL and ratemeters detection
  55. GRB 200519A: CALET Gamma-Ray Burst Monitor detection
  56. GRB 200519A: Insight-HXMT/HE detection
  57. GRB 200519A: Swift/UVOT Detection
  58. GRB 200519A: AstroSat CZTI detection
  59. GRB 200519A: 1.3m DFOT Optical Afterglow Detection
  60. GRB 200519A: LCO Optical Afterglow Detection
  61. Fermi GBM Sub-Threshold Detection of GRB 200517A
  62. GRB 200519A: iTelescope optical afterglow detection
  63. GRB 200519A: Swift detection of a burst with an optical afterglow
  64. IPN triangulation of GRB 200514B (short)
  65. GRB 200517A: Swift-XRT afterglow detection
  66. GRB 200514A: AstroSat CZTI detection
  67. GRB 200517A: MAXI/GSC detection
  68. Swift J1818.0-1607: BOOTES-3/YA optical upper limit
  69. Swift Detection of a burst from SGR Swift J1818.0-1607
  70. GRB 200514B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 611140062) - More Candidates
  71. GRB 200514A: CALET Gamma-Ray Burst Monitor detection
  72. GRB200514B: YSE detection of ZTF20aazpphd
  73. GRB200514B: ATLAS detections of ZTF20aazpphd
  74. GRB200514B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 611140062)
  75. GRB 200514B: Fermi GBM Final Real-time Localization
  76. GRB 200514A: MAXI/GSC detection
  77. Fermi GBM Sub-Threshold Detection of GRB 200512A
  78. AGILE detection of a burst from SGR 1935+2154 on May 10, 2020
  79. GRB 200512A: Swift detection of a burst
  80. SGR 1935+2154: AstroSat CZTI detection
  81. IceCube-200512A: IceCube observation of a high-energy neutrino candidate event
  82. Insight-HXMT's continued observation plan for SGR J1935+2154
  83. GRB 200510A: AstroSat CZTI detection
  84. GRB 200510A: Fermi GBM Final Real-time Localization
  85. GRB 200509A: Swift/UVOT Detection
  86. GRB 200509C: Fermi GBM Final Real-time Localization
  87. GRB 200509B: Fermi GBM Final Real-time Localization
  88. GRB 200509A: LCO Optical Afterglow Detection
  89. GRB 200509A: Swift detection of a burst with a possible optical counterpart
  90. FRB/X-ray bursts from SGR 1935+2154: No Neutrino Counterpart in ANTARES data
  91. GRB 200507A: Fermi GBM Final Real-time Localization
  92. GRB 200506A: AstroSat CZTI detection
  93. GRB 200506C: AstroSat CZTI detection
  94. Swift Detection of a burst from SGR Swift J1818.0-1607
  95. GRB 200505A: AGILE detection
  96. GRB 200506C: Fermi GBM Final Real-time Localization
  97. GRB 200506B: Fermi GBM Final Real-time Localization
  98. GRB 200506A: Fermi GBM Final Real-time Localization
  99. GRB 200505A: Fermi GBM Final Real-time Localization
  100. Insight-HXMT detection of a short bright burst from SGR 1935+2154

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