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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"

37347 results found.

  1. GRB 240603A: GECAM detection of a short burst
  2. GRB 240529A: continued SAO RAS optical observations
  3. Fermi GRB 240602A: Global MASTER-Net observations report
  4. GRB 240529A: OSN optical detection
  5. GRB 240529A: further SAO RAS optical observations
  6. GRB 240602A: Fermi GBM Final Real-time Localization
  7. Swift Trigger 1232465 is not a GRB
  8. GRB 240529A: AKO Optical Afterglow Follow-Up Observations
  9. GRB 240529A: 1.3m DFOT Optical observations
  10. GRB 240531A: AstroSat CZTI detection of a short burst
  11. GRB 240529A : Mondy optical observations
  12. Konus-Wind detection of GRB 240529A
  13. IPN triangulation of the initial episode of GRB 240529A
  14. GRB 240529A: SAO RAS optical observations
  15. GRB 240529A: MAAO 0.7m telescope optical afterglow detection
  16. GRB 240529A: Insight-HXMT/HE detection
  17. GRB 240529A: optical photometry from Konkoly
  18. GRB 240529A: GROWTH-India optical follow-up
  19. GRB 240529A: T193/MISTRAL observations
  20. GRB 240529A: Redshift from GTC/OSIRIS+
  21. GRB 240529A: AKO Optical Afterglow Detection
  22. LIGO/Virgo/KAGRA S240527fv: Upper limits from Swift/BAT-GUANO
  23. LIGO/Virgo/KAGRA S240525p: Upper limits from Swift/BAT-GUANO
  24. GRB 240529A: J-band detections with WINTER
  25. GRB 240529A: Skynet Optical Observations
  26. GRB 240529A: Swift-BAT refined analysis
  27. GRB 240529A: Swift-XRT refined Analysis
  28. GRB240529A: BOOTES-6/DPRT optical detection
  29. GRB 240529A: Swift/UVOT Detection
  30. GRB 240529A: NOT optical observations
  31. GRB 240529A: AstroSat CZTI detection
  32. GRB 240529A: GOTO optical afterglow detection
  33. GRB 240527B: Swift-XRT afterglow detection
  34. GRB 240529A: Enhanced Swift-XRT position
  35. GRB 240529A: Swift detection of a burst with an optical counterpart
  36. GRB 240527B: Fermi GBM Observation
  37. Fermi GRB 240527A: Global MASTER-Net observations report
  38. GRB 240527B: Fermi-LAT detection
  39. Fermi GRB 240527B: Global MASTER-Net observations report
  40. GRB 240527B: Fermi GBM Final Localization
  41. GRB 240527B: BALROG localization (Fermi Trigger 738511436 / GRB 240527586)
  42. GRB 240527A: Fermi GBM Final Real-time Localization
  43. GRB 240523A: Swift-BAT refined analysis
  44. GRB 240523A: Swift-XRT refined Analysis
  45. GRB 240523A: Enhanced Swift-XRT position
  46. GRB 240523A: Swift detection of a burst
  47. GRB 240521B: Fermi GBM Observation
  48. Fermi GBM Sub-Threshold Detection of GRB 240516B
  49. GRB 240513A: Swift-XRT afterglow detection
  50. GRB 240521B: Swift/BAT-GUANO arcminute localization of a long burst
  51. GRB 240521A: GECAM-B detection of a long burst
  52. GRB 240516B: AstroSat CZTI detection
  53. LIGO/Virgo/KAGRA S240515m: Upper limits from Swift/BAT-GUANO
  54. LIGO/Virgo/KAGRA S240514x: Upper limits from Swift/BAT-GUANO
  55. LIGO/Virgo/KAGRA S240513ei: Upper limits from Swift/BAT-GUANO
  56. GRB 240514B: VZLUSAT-2 detection
  57. GRB 240504A: VZLUSAT-2 detection
  58. GRB 240502A: VZLUSAT-2 detection
  59. GRB 240519A: GRBAlpha detection
  60. GRB 240516A: Swift/UVOT Upper Limits
  61. GRB 240519A: AstroSat CZTI detection
  62. GRB 240519A: BALROG localization (Fermi Trigger 737788024 / GRB 240519213)
  63. GRB 240516A: Swift-BAT refined analysis
  64. Fermi GRB 240517A: Global MASTER-Net observations report
  65. GRB 240516A ATCA radio observations
  66. IPN triangulation of GRB 240514B (short)
  67. GRB 240513A: Swift ToO observations
  68. GRB 240517A: Fermi GBM Final Real-time Localization
  69. Konus-Wind detection of GRB 240513A
  70. GRB 240516A: AstroSat CZTI detection
  71. GRB 240516A: Swift-XRT refined Analysis
  72. GRB 240514E: A possible candidate BD-21 1074
  73. GRB 240516A: Fermi GBM Observation
  74. GRB 240511A: Observations from GTC/OSIRIS+
  75. GRB 240502C: Zeiss-1000 at Koshka observations of GOTO24bao optical counterpart candidate
  76. GRB 240516A: GOTO optical upper limit
  77. LIGO/Virgo/KAGRA S240422ed: GRID non-detection and upper limits
  78. GRB 240516A: Swift detection of a burst
  79. GRB 240514B: AT2024ixa/GOTO24bph is not consistent with the Fermi localisation
  80. GRB 240511A: radio detection of afterglow candidate
  81. GRB 240514B: GOTO candidate optical counterpart
  82. Fermi Gamma-ray Burst Monitor list of triggers that are not a GRB
  83. GRB 240514E: MAXI/GSC detection of a probable afterglow
  84. GRB 240514B: GRBAlpha detection
  85. GRB 240514B: Fermi GBM Detection
  86. GRB 240513A: Fermi GBM observation
  87. GRB 240513A: Swift-XRT observations
  88. GRB 240514D: AstroSat CZTI detection
  89. GRB 240514C: Fermi GBM Final Real-time Localization
  90. Fermi GRB 240514B: Global MASTER-Net observations report
  91. GRB 240514B: Fermi GBM Final Real-time Localization
  92. LIGO/Virgo/KAGRA S240507p: Upper limits from Swift/BAT-GUANO
  93. LIGO/Virgo/KAGRA S240505av: Upper limits from Swift/BAT-GUANO
  94. LIGO/Virgo/KAGRA S240505av: Upper limits from Swift/BAT-GUANO
  95. GRB 240514A: Fermi GBM Final Real-time Localization
  96. GRB 240513A: Tiled Swift observations
  97. GRB 240513A: Fermi-LAT detection
  98. GRB 240511A: Fermi GBM Observation
  99. GRB 240511A: Swift-BAT refined analysis
  100. Fermi GRB 240513B: Global MASTER-Net observations report

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