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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"

23707 results found.

  1. Fermi trigger No 741211696: Global MASTER-Net observations report
  2. EP240626a: Montarrenti Observatory optical upper limit
  3. EP240626a: KAIT optical upper limit
  4. EP240625a: GRANDMA Optical Upper Limits
  5. EP240626a: EP-FXT detection of the X-ray emission
  6. GRB 240624A: Swift-BAT refined analysis
  7. Konus-Wind detection of GRB 240619A
  8. EP240626a: BOOTES-7 optical upper limit
  9. EP240626a: EP-WXT detection of a fast X-ray transient
  10. Fermi GRB 240625B: Global MASTER-Net observations report
  11. GRB 240624B: CALET Gamma-Ray Burst Monitor detection
  12. GRB 240625A: Fermi GBM Observation
  13. EP240625a: NOT optical counterpart candidate
  14. EP240625a: EP-FXT detection of the X-ray emission
  15. GRB 240624B: GRBAlpha detection
  16. EP240625a: EP-WXT detection of a fast X-ray transient
  17. GRB240624A: Fermi GBM Observation
  18. Swift GRB 240624A: Global MASTER-Net observations report
  19. Fermi GRB 240624A: Global MASTER-Net observations report
  20. Fermi trigger No 740949590: Global MASTER-Net observations report
  21. GRB 240624A: Swift detection of a burst
  22. EP240618a: NOT further optical observations
  23. GRB 240619A: J-band detection with WINTER
  24. Fermi trigger No 740744838: Global MASTER-Net observations report
  25. EP240618a: NOT optical counterpart candidate
  26. EP240618a: GSP optical upper limit
  27. LIGO/Virgo/KAGRA S240622h: Identification of a GW compact binary merger candidate
  28. LIGO/Virgo/KAGRA S240621eb: Identification of a GW compact binary merger candidate
  29. LIGO/Virgo/KAGRA S240621dy: Identification of a GW compact binary merger candidate
  30. IPN triangulation of GRB 240615A (short)
  31. X-ray transient EP240618a: Fermi/GBM non-detection
  32. GRB 240619A: GRBAlpha detection
  33. EP240618a: Swift/XRT upper limit
  34. EP240617a: tentative Swift/XRT detection of the afterglow
  35. GRB 240619A: Swift-XRT probable afterglow detection
  36. GRB 240619A: CALET Gamma-Ray Burst Monitor detection
  37. GRB 240619A: GOTO candidate optical afterglow
  38. GRB 240615A: NOT optical observations
  39. EP240618a: GRANDMA Optical Upper Limits
  40. EP240618a: TRT optical upper limit
  41. Fermi trigger No 740474239: Global MASTER-Net observations report
  42. Fermi GRB 240619A: Global MASTER-Net observations report
  43. EP240617a: STEP/T80S optical limits
  44. LIGO/Virgo S240615dg: GRANDMA/FRAM-CTA-N Observations
  45. EP240618a: OHP/T193 MISTRAL i' and Y band upper limits
  46. EP240618a: BOOTES-6/DPRT optical upper limit
  47. LIGO/Virgo S240615dg: Swift XRT observations, 39 X-ray sources
  48. Fermi trigger No 740430582: Global MASTER-Net observations report
  49. EP240617a: BOOTES-6/DPRT optical upper limit
  50. EP240617a: EP-WXT detection of a fast X-ray transient
  51. EP240618a: EP-WXT detection of a fast X-ray transient and EP-FXT quick follow-up
  52. LIGO/Virgo/KAGRA S240618ah: Identification of a GW compact binary merger candidate
  53. GRB 240615A: J-band upper limits from WINTER
  54. GRB 240615A: Swift-XRT observations
  55. Fermi trigger No 740221779: Global MASTER-Net observations report
  56. Fermi GRB 240616A: Global MASTER-Net observations report
  57. Konus-Wind detection of GRB 240615A (short/hard)
  58. GRB 240615A: GOTO optical upper limits
  59. Fermi trigger No 740166710: Global MASTER-Net observations report
  60. LIGO/Virgo/KAGRA S240615ea: Identification of a GW compact binary merger candidate
  61. LIGO/Virgo/KAGRA S240615dg: Identification of a GW compact binary merger candidate
  62. GRB 240603A: VZLUSAT-2 detection
  63. GRB 240612A: GRBAlpha detection
  64. Fermi GRB 240612B: Global MASTER-Net observations report
  65. Fermi GRB 240612A: Global MASTER-Net observations report
  66. Fermi GRB 240611A: Global MASTER-Net observations report
  67. Konus-Wind detection of GRB 240607A
  68. EXO 0748-676: Swift-BAT refined analysis
  69. GRB240529A: 3.6m TNG NIR detection 8d after the burst
  70. GRB 240529A: LBT optical detection and late temporal decay
  71. GRB 240529A : MITSuME Akeno optical afterglow detection
  72. Trigger 1236151: Swift detection of EXO 0748-676
  73. Fermi GRB 240610A: Global MASTER-Net observations report
  74. IPN triangulation of GRB 240607A
  75. Fermi trigger No 739632045: Global MASTER-Net observations report
  76. Fermi GRB 240608A: Global MASTER-Net observations report
  77. Konus-Wind detection of GRB 240606B
  78. Fermi trigger No 739506569: Global MASTER-Net observations report
  79. Fermi GRB 240607A: Global MASTER-Net observations report
  80. GRB 240529A: NOEMA detection
  81. Fermi trigger No 739373591: Global MASTER-Net observations report
  82. GRB 240606B: Swift-XRT afterglow detection
  83. Swift GRB240606.15: Global MASTER-Net observations report
  84. Konus-Wind detection of GRB 240603A
  85. Swift Trigger 1235109: a possible GRB 240606A
  86. Fermi GRB 240604A: Global MASTER-Net observations report
  87. Fermi GRB 240605A: Global MASTER-Net observations report
  88. Fermi GRB 240605C: Global MASTER-Net observations report
  89. IPN triangulation of GRB 240603A
  90. GRB 240604A: GECAM detection of a long burst
  91. Swift Trigger 1232755: likely consistent with noise and not astrophysical
  92. Fermi GRB 240603C: Global MASTER-Net observations report
  93. Swift Trigger 1232465: consistent with noise
  94. GRB 240529A: MASTER prompt OT detection
  95. GRB 240603A: GECAM detection of a short burst
  96. Fermi GRB 240602A: Global MASTER-Net observations report
  97. The EP-WXT source triggered on June 1st is likely a flaring star
  98. LIGO/Virgo/KAGRA S240601co: Identification of a GW compact binary merger candidate
  99. Swift Trigger 1232465 is not a GRB
  100. LXT 240528A: GSP optical upper limit

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