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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"

24511 results found.

  1. GRB 240821A: BALROG localization (Fermi Trigger 745958167 / GRB 240821775)
  2. GRB 240821A : a likely short GRB detected by SVOM/ECLAIRs
  3. GRB 240821A: Fermi GBM Final Real-time Localization
  4. GRB 240819A: Swift-XRT observations
  5. GRB 240820B: SVOM/GRM observation
  6. EP240820a: EP detection of a fast X-ray transient
  7. EP240816a: PRIME upper limits
  8. Fermi trigger No 745873283: Global MASTER-Net observations report
  9. Fermi trigger No 745871958: Global MASTER-Net observations report
  10. GRB 240819A : an X-ray transient detected by SVOM/ECLAIRs
  11. GRB 240819A: X-ray follow-up observation with EP-FXT
  12. GRB 240820A: Fermi GBM Final Real-time Localization
  13. GRB 240815A: SVOM/GRM observation
  14. GRB 240817A: Fermi GBM Final Real-time Localization
  15. Integral GRB240816.79: Global MASTER-Net observations report
  16. GRB 240814B: GRBAlpha detection
  17. Fermi trigger No 745501396: Global MASTER-Net observations report
  18. EP EP240816b: Global MASTER-Net observations report
  19. Fermi GRB 240814A: Global MASTER-Net observations report
  20. Fermi GRB 240814C: Global MASTER-Net observations report
  21. Fermi trigger No 745306088: Global MASTER-Net observations report
  22. GRB 240814C: Fermi GBM Final Real-time Localization
  23. Fermi GRB 240814B: Global MASTER-Net observations report
  24. GRB 240812B: SVOM/GRM observation
  25. EP240802a: Kinder optical, SWIFT-UVOT, and SWIFT-XRT upper limits 6 days after the WXT detection
  26. GRB 240814B: Fermi GBM Final Real-time Localization
  27. GRB 240814A: Fermi GBM Final Real-time Localization
  28. LIGO/Virgo/KAGRA S240813d: Updated Sky localization
  29. Fermi trigger No 745220784: Global MASTER-Net observations report
  30. Konus-Wind detection of GRB 240811A
  31. Konus-Wind detection of GRB 240810A
  32. LIGO/Virgo/KAGRA S240813d: Identification of a GW compact binary merger candidate
  33. LIGO/Virgo/KAGRA S240813c: Updated Sky localization
  34. LIGO/Virgo/KAGRA S240813c: Identification of a GW compact binary merger candidate
  35. GRB 240810A: SVOM/GRM observation
  36. GRB 240812D: Fermi GBM Final Real-time Localization
  37. GRB 240812C: Fermi GBM Final Real-time Localization
  38. IPN triangulation of GRB 240810A (short)
  39. GRB 240811A: Swift-BAT refined analysis
  40. GRB 240809A: Swift-BAT refined analysis
  41. EP240807a: PRIME H-band upper limits
  42. IceCube-240808A: Upper limits from a search for additional neutrino events in IceCube
  43. EP240801a: Assy-Turgen optical observations
  44. Fermi GRB 240810A: Global MASTER-Net observations report
  45. GRB 240812A: Fermi GBM Final Real-time Localization
  46. GRB 240811A: LCOGT Optical Upper Limit
  47. GRB 240811A: Upper limits with Mephisto
  48. Konus-Wind detection of GRB 240809A
  49. Fermi trigger No 745057312: Global MASTER-Net observations report
  50. Swift GRB 240811A: Global MASTER-Net observations report
  51. GRB 240810A: Fermi GBM Final Real-time Localization
  52. GRB 240809A: REM detection of the optical afterglow
  53. Konus-Wind detection of GRB 240807A (a counterpart of EP240807a)
  54. GRB 240809A: Conclusive redshift from VLT
  55. Fermi-LAT gamma-ray observations of IceCube-240808A
  56. GRB 240809A: KAIT optical observations
  57. IPN triangulation of GRB 240807A / EP 240807a
  58. LIGO/Virgo/KAGRA S240807h: Updated Sky localization and EM Bright Classification
  59. X-ray Transient EP240807a: PRIME near-infrared upper limits
  60. Swift GRB 240809A: Global MASTER-Net observations report
  61. GRB 240809A: SVOM/GRM observation
  62. GRB 240807A: SVOM/GRM observation
  63. EP-WXT trigger 01709018832: SVOM/C-GFT observations of the star flare
  64. IceCube Alert 240808.27: Global MASTER-Net observations report
  65. EP EP240807a: Global MASTER-Net observations report
  66. EP EP240806a: Global MASTER-Net observations report
  67. IceCube-240808A - IceCube observation of a high-energy neutrino candidate track-like event
  68. GRB 240801A: GRBAlpha detection
  69. GRB 240807B: Fermi GBM Final Localization
  70. GRB 240710B: VZLUSAT-2 detection
  71. Fermi trigger No 744761058: Global MASTER-Net observations report
  72. EP240807a/GRB 240807A: EP-FXT detection of the X-ray emission
  73. S240807h: Identification of a GW compact binary merger candidate
  74. EP240802a/GRB240802A: KAIT optical upper limit
  75. GRB 240720B: VZLUSAT-2 detection
  76. GRB 240710A: VZLUSAT-2 detection
  77. EP240806A: Liverpool Telescope optical follow-up observations
  78. The EP-WXT trigger 01709018832 on August 7th is likely a flaring star
  79. GRB 240807A: Fermi GBM Final Localization
  80. GRB 240805B: GIT optical upper limit
  81. EP240806a: KAIT optical observations
  82. GRB 240805B: Swift-BAT refined analysis
  83. GRB 240805A: Swift-BAT refined analysis
  84. Fermi trigger No 744629911: Global MASTER-Net observations report
  85. EP240804a (GRB 240804B): NOT optical observations
  86. Konus-Wind detection of GRB 240802A (EP240802a)
  87. Improved IPN triangulation of GRB 240802A / EP 240802a
  88. Konus-Wind detection of GRB 240805A
  89. GRB240805A: Fermi GBM Observation
  90. Konus-Wind detection of GRB 240804B (a counterpart of EP240804a)
  91. EP240806a: EP-FXT detection of the X-ray emission
  92. GRB 240626B: VZLUSAT-2 detection
  93. GRB 240624B: VZLUSAT-2 detection
  94. GRB 240619C: VZLUSAT-2 detection
  95. GRB 240805B: Optical detection with 1.6m Mephisto
  96. GRB 240805B: NUTTelA-TAO / BSTI Optical Limits
  97. GRB 240805B: Swift-XRT refined Analysis
  98. Fermi trigger No 744544656: Global MASTER-Net observations report
  99. GRB 240805A: SVOM/GRM observation
  100. GRB 240805B: LCOGT Optical Upper Limits

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