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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"

24514 results found.

  1. GRB 240821A: GRANDMA/LesMakes-T60 Upper Limit
  2. GRB 240821B: Fermi GBM Final Localization
  3. Fermi trigger No 745866488: Global MASTER-Net observations report
  4. GRB 240821A: BALROG localization (Fermi Trigger 745958167 / GRB 240821775)
  5. GRB 240821A : a likely short GRB detected by SVOM/ECLAIRs
  6. GRB 240821A: Fermi GBM Final Real-time Localization
  7. GRB 240819A: Swift-XRT observations
  8. GRB 240820B: SVOM/GRM observation
  9. EP240820a: EP detection of a fast X-ray transient
  10. EP240816a: PRIME upper limits
  11. Fermi trigger No 745873283: Global MASTER-Net observations report
  12. Fermi trigger No 745871958: Global MASTER-Net observations report
  13. GRB 240819A : an X-ray transient detected by SVOM/ECLAIRs
  14. GRB 240819A: X-ray follow-up observation with EP-FXT
  15. GRB 240820A: Fermi GBM Final Real-time Localization
  16. GRB 240815A: SVOM/GRM observation
  17. GRB 240817A: Fermi GBM Final Real-time Localization
  18. Integral GRB240816.79: Global MASTER-Net observations report
  19. GRB 240814B: GRBAlpha detection
  20. Fermi trigger No 745501396: Global MASTER-Net observations report
  21. EP EP240816b: Global MASTER-Net observations report
  22. Fermi GRB 240814A: Global MASTER-Net observations report
  23. Fermi GRB 240814C: Global MASTER-Net observations report
  24. Fermi trigger No 745306088: Global MASTER-Net observations report
  25. GRB 240814C: Fermi GBM Final Real-time Localization
  26. Fermi GRB 240814B: Global MASTER-Net observations report
  27. GRB 240812B: SVOM/GRM observation
  28. EP240802a: Kinder optical, SWIFT-UVOT, and SWIFT-XRT upper limits 6 days after the WXT detection
  29. GRB 240814B: Fermi GBM Final Real-time Localization
  30. GRB 240814A: Fermi GBM Final Real-time Localization
  31. LIGO/Virgo/KAGRA S240813d: Updated Sky localization
  32. Fermi trigger No 745220784: Global MASTER-Net observations report
  33. Konus-Wind detection of GRB 240811A
  34. Konus-Wind detection of GRB 240810A
  35. LIGO/Virgo/KAGRA S240813d: Identification of a GW compact binary merger candidate
  36. LIGO/Virgo/KAGRA S240813c: Updated Sky localization
  37. LIGO/Virgo/KAGRA S240813c: Identification of a GW compact binary merger candidate
  38. GRB 240810A: SVOM/GRM observation
  39. GRB 240812D: Fermi GBM Final Real-time Localization
  40. GRB 240812C: Fermi GBM Final Real-time Localization
  41. IPN triangulation of GRB 240810A (short)
  42. GRB 240811A: Swift-BAT refined analysis
  43. GRB 240809A: Swift-BAT refined analysis
  44. EP240807a: PRIME H-band upper limits
  45. IceCube-240808A: Upper limits from a search for additional neutrino events in IceCube
  46. EP240801a: Assy-Turgen optical observations
  47. Fermi GRB 240810A: Global MASTER-Net observations report
  48. GRB 240812A: Fermi GBM Final Real-time Localization
  49. GRB 240811A: LCOGT Optical Upper Limit
  50. GRB 240811A: Upper limits with Mephisto
  51. Konus-Wind detection of GRB 240809A
  52. Fermi trigger No 745057312: Global MASTER-Net observations report
  53. Swift GRB 240811A: Global MASTER-Net observations report
  54. GRB 240810A: Fermi GBM Final Real-time Localization
  55. GRB 240809A: REM detection of the optical afterglow
  56. Konus-Wind detection of GRB 240807A (a counterpart of EP240807a)
  57. GRB 240809A: Conclusive redshift from VLT
  58. Fermi-LAT gamma-ray observations of IceCube-240808A
  59. GRB 240809A: KAIT optical observations
  60. IPN triangulation of GRB 240807A / EP 240807a
  61. LIGO/Virgo/KAGRA S240807h: Updated Sky localization and EM Bright Classification
  62. X-ray Transient EP240807a: PRIME near-infrared upper limits
  63. Swift GRB 240809A: Global MASTER-Net observations report
  64. GRB 240809A: SVOM/GRM observation
  65. GRB 240807A: SVOM/GRM observation
  66. EP-WXT trigger 01709018832: SVOM/C-GFT observations of the star flare
  67. IceCube Alert 240808.27: Global MASTER-Net observations report
  68. EP EP240807a: Global MASTER-Net observations report
  69. EP EP240806a: Global MASTER-Net observations report
  70. IceCube-240808A - IceCube observation of a high-energy neutrino candidate track-like event
  71. GRB 240801A: GRBAlpha detection
  72. GRB 240807B: Fermi GBM Final Localization
  73. GRB 240710B: VZLUSAT-2 detection
  74. Fermi trigger No 744761058: Global MASTER-Net observations report
  75. EP240807a/GRB 240807A: EP-FXT detection of the X-ray emission
  76. S240807h: Identification of a GW compact binary merger candidate
  77. EP240802a/GRB240802A: KAIT optical upper limit
  78. GRB 240720B: VZLUSAT-2 detection
  79. GRB 240710A: VZLUSAT-2 detection
  80. EP240806A: Liverpool Telescope optical follow-up observations
  81. The EP-WXT trigger 01709018832 on August 7th is likely a flaring star
  82. GRB 240807A: Fermi GBM Final Localization
  83. GRB 240805B: GIT optical upper limit
  84. EP240806a: KAIT optical observations
  85. GRB 240805B: Swift-BAT refined analysis
  86. GRB 240805A: Swift-BAT refined analysis
  87. Fermi trigger No 744629911: Global MASTER-Net observations report
  88. EP240804a (GRB 240804B): NOT optical observations
  89. Konus-Wind detection of GRB 240802A (EP240802a)
  90. Improved IPN triangulation of GRB 240802A / EP 240802a
  91. Konus-Wind detection of GRB 240805A
  92. GRB240805A: Fermi GBM Observation
  93. Konus-Wind detection of GRB 240804B (a counterpart of EP240804a)
  94. EP240806a: EP-FXT detection of the X-ray emission
  95. GRB 240626B: VZLUSAT-2 detection
  96. GRB 240624B: VZLUSAT-2 detection
  97. GRB 240619C: VZLUSAT-2 detection
  98. GRB 240805B: Optical detection with 1.6m Mephisto
  99. GRB 240805B: NUTTelA-TAO / BSTI Optical Limits
  100. GRB 240805B: Swift-XRT refined Analysis

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