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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"

14972 results found.

  1. GRB 200601A: Insight-HXMT/HE detection
  2. GRB 200601A: Fermi GBM Final Real-time Localization
  3. IceCube-200530A: No significant detection in HAWC
  4. IceCube-200530A: No ANTARES neutrino counterpart
  5. GRB 200531A: Fermi GBM Final Real-time Localization
  6. Konus-Wind observation of GRB 200524A
  7. IceCube-200530A - IceCube observation of a high-energy neutrino candidate event
  8. GRB 200530A: AstroSat CZTI detection
  9. GRB 200530A: Fermi GBM Final Real-time Localization
  10. GRB 200528A: CAHA Upper Limit
  11. GRB 200529A: Fermi GBM Detection
  12. GRB 200529A: LCO Optical Afterglow Detection
  13. GRB 200528A: CALET Gamma-Ray Burst Monitor detection
  14. GRB 200529B: Fermi GBM Final Real-time Localization
  15. GRB 200529A: KAIT Optical Afterglow Confirmation
  16. GRB 200529A: Swift detection of a burst
  17. GRB 200529A: Fermi GBM Final Real-time Localization
  18. GRB 200528A: Potential host galaxy in PanSTARRS, SDSS and WISE
  19. GRB 200528A: Swift detection of a burst
  20. GRB 200528A: Fermi GBM Final Real-time Localization
  21. GRB 200522A: HST F125W new point source detection
  22. GRB 200522A: Hubble Space Telescope Near-IR F160W Observations
  23. GRB200524A: UVOT detection
  24. GRB 200524A: optical upper limits from further MITSuME Akeno observation
  25. GRB 200525A: Fermi GBM Final Real-time Localization
  26. GRB 200524A: AstroSat CZTI detection
  27. GRB 200524A: Further Liverpool Telescope observations
  28. GRB200521A: ASIM observation
  29. GRB 200524A: KAIT Optical Observations
  30. GRB 200524A: MITSuME Akeno optical observation
  31. GRB 200524A: Swift-XRT afterglow detection
  32. GRB 200524A: OAJ multicolor afterglow detection
  33. GRB 200524A: Fermi GBM detection
  34. GRB 200524A: CAHA multicolor afterglow detection
  35. ZTF Discovery of ZTF20abbiixp: The Likely Optical Afterglow to GRB 200524A
  36. GRB 200524A: Fermi-LAT detection
  37. Konus-Wind detection of short/hard GRB 200521A
  38. IPN triangulation of GRB 200521A (short)
  39. GRB 200522A: LCO Optical Afterglow Detection
  40. CGBM-SPI-ACS triangulation of short GRB 200521A
  41. IceCube-200523A - IceCube observation of a high-energy neutrino candidate event
  42. GRB 200522A: 6 GHz VLA radio source detection
  43. GRB 200522B: Fermi GBM Final Real-time Localization
  44. GRB 200522A: Swift detection of a short burst
  45. GRB 200521A: CALET Gamma-Ray Burst Monitor detection
  46. GRB 200521A: AGILE/MCAL and ratemeters detection
  47. GRB 200519A: CALET Gamma-Ray Burst Monitor detection
  48. GRB 200519A: Insight-HXMT/HE detection
  49. GRB 200519A: Swift/UVOT Detection
  50. GRB 200519A: AstroSat CZTI detection
  51. GRB 200519A: 1.3m DFOT Optical Afterglow Detection
  52. GRB 200519A: LCO Optical Afterglow Detection
  53. Fermi GBM Sub-Threshold Detection of GRB 200517A
  54. GRB 200519A: iTelescope optical afterglow detection
  55. GRB 200519A: Swift detection of a burst with an optical afterglow
  56. IPN triangulation of GRB 200514B (short)
  57. GRB 200517A: Swift-XRT afterglow detection
  58. GRB 200514A: AstroSat CZTI detection
  59. GRB 200517A: MAXI/GSC detection
  60. Swift J1818.0-1607: BOOTES-3/YA optical upper limit
  61. Swift Detection of a burst from SGR Swift J1818.0-1607
  62. GRB 200514B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 611140062) - More Candidates
  63. GRB 200514A: CALET Gamma-Ray Burst Monitor detection
  64. GRB200514B: YSE detection of ZTF20aazpphd
  65. GRB200514B: ATLAS detections of ZTF20aazpphd
  66. GRB200514B: Zwicky Transient Facility Follow-Up of a Fermi Short GRB (Trigger 611140062)
  67. GRB 200514B: Fermi GBM Final Real-time Localization
  68. GRB 200514A: MAXI/GSC detection
  69. Fermi GBM Sub-Threshold Detection of GRB 200512A
  70. AGILE detection of a burst from SGR 1935+2154 on May 10, 2020
  71. GRB 200512A: Swift detection of a burst
  72. SGR 1935+2154: AstroSat CZTI detection
  73. IceCube-200512A: IceCube observation of a high-energy neutrino candidate event
  74. Insight-HXMT's continued observation plan for SGR J1935+2154
  75. GRB 200510A: AstroSat CZTI detection
  76. GRB 200510A: Fermi GBM Final Real-time Localization
  77. GRB 200509A: Swift/UVOT Detection
  78. GRB 200509C: Fermi GBM Final Real-time Localization
  79. GRB 200509B: Fermi GBM Final Real-time Localization
  80. GRB 200509A: LCO Optical Afterglow Detection
  81. GRB 200509A: Swift detection of a burst with a possible optical counterpart
  82. FRB/X-ray bursts from SGR 1935+2154: No Neutrino Counterpart in ANTARES data
  83. GRB 200507A: Fermi GBM Final Real-time Localization
  84. GRB 200506A: AstroSat CZTI detection
  85. GRB 200506C: AstroSat CZTI detection
  86. Swift Detection of a burst from SGR Swift J1818.0-1607
  87. GRB 200505A: AGILE detection
  88. GRB 200506C: Fermi GBM Final Real-time Localization
  89. GRB 200506B: Fermi GBM Final Real-time Localization
  90. GRB 200506A: Fermi GBM Final Real-time Localization
  91. GRB 200505A: Fermi GBM Final Real-time Localization
  92. Insight-HXMT detection of a short bright burst from SGR 1935+2154
  93. AGILE detection of a short and hard X-ray burst possibly related to SGR 1935+2154
  94. GRB 200502A: AstroSat CZTI detection
  95. GRB 200503B: Fermi GBM Final Real-time Localization
  96. Geocentric time correction for Insight-HXMT detection of the x-ray counterpart of the FRB by CHIME and STARE2 from SGR 1935+2154
  97. AstroSat CZTI detection : GRB200503A
  98. Insight-HXMT X-ray and hard X-ray upper limits to the radio burst detected by FAST from SGR 1935+2154
  99. GRB 200502A: Fermi GBM Final Real-time Localization
  100. GRB 200424A: Swift-XRT afterglow detection

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