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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"

11569 results found.

  1. Fermi trigger No 743219692: Global MASTER-Net observations report
  2. IceCube-240721A - IceCube observation of a high-energy neutrino candidate track-like event
  3. Fermi Gamma-ray Burst Monitor trigger 743243582/240721356 (GRB 240721A) is not a GRB
  4. GRB 240721A: Fermi GBM Final Real-time Localization
  5. Fermi GRB 240720A: Global MASTER-Net observations report
  6. GRB 240720A: AstroSat CZTI detection
  7. GRB 240720A: Fermi GBM observation
  8. Konus-Wind detection of GRB 240718A
  9. GRB 240713A: SVOM/GRM observation
  10. Fermi GRB 240718A: Global MASTER-Net observations report
  11. GRB 240718A: Fermi GBM Observation
  12. GRB 240718A: Fermi-LAT Detection
  13. GRB 240718A: SVOM/GRM observation
  14. GRB 240718A: BALROG localization (Fermi Trigger 742976945 / GRB 240718270)
  15. GRB 240718A: Fermi GBM Final Real-time Localization
  16. Fermi-LAT gamma-ray observations of IceCube-cascade-240714A
  17. GRB 240715A: Swift/UVOT observations of the XRT sources.
  18. GRB 240715A: GECAM-C detection of a short burst
  19. Konus-Wind detection of GRB 240715A
  20. GRB 240715A: TRT optical upper limit on one Swift/XRT candidate
  21. SVOM/GRM In-Flight Trigger of GRB 240715A
  22. GRB 240713A: LAST optical upper limit
  23. Fermi GRB 240715A: Global MASTER-Net observations report
  24. GRB 240713A: optical upper limits from the INAF Asiago Observatory
  25. GRB 240715A: Fermi GBM Observation
  26. GRB240715A: GRANDMA Optical Upper Limits
  27. IPN triangulation of GRB 240715A (short)
  28. GRB 240715A: Fermi GBM Final Real-time Localization
  29. GRB 240713A: J-band upper limit from WINTER
  30. GRB 240713A: NOT optical upper limits on three EP/FXT candidates
  31. GRB 240713A: JinShan optical upper limits
  32. GRB 240713A: OHP/T120 optical upper limit
  33. GRB240713A: X-ray follow-up observation with EP-FXT
  34. Fermi Sub-threshold Observation of GRB240713A
  35. Fermi Gamma-ray Burst Monitor trigger 742413075/240711744 is not a GRB
  36. GRB 240711A: Fermi GBM Final Real-time Localization
  37. Fermi trigger No 742405878: Global MASTER-Net observations report
  38. Fermi trigger No 742317942: Global MASTER-Net observations report
  39. Fermi GRB 240710A: Global MASTER-Net observations report
  40. GRB 240710A: Fermi GBM Final Real-time Localization
  41. Fermi Gamma-ray Burst Monitor trigger 741911057/240705933 is not a GRB
  42. GRB 240705A: Fermi GBM Final Real-time Localization
  43. IPN triangulation of GRB 240628B (short)
  44. IPN triangulation of GRB 240627A
  45. GRB 240619A: Host galaxy redshift from VLT/X-shooter
  46. The first three GRBs detected by SVOM: GRB 240627B, GRB 240629A and GRB 240702A
  47. GRB 240702A: BALROG localization (Fermi Trigger / GRB 240702885)
  48. Fermi GRB 240702A: Global MASTER-Net observations report
  49. GRB 240702A: Fermi GBM Final Real-time Localization
  50. Fermi Gamma-ray Burst Monitor trigger 741448122/240630575 is not a GRB
  51. Fermi trigger No 741448122: Global MASTER-Net observations report
  52. LIGO/Virgo/KAGRA S240629by: Upper limits from Fermi-GBM Observations
  53. Fermi trigger No 741356809: Global MASTER-Net observations report
  54. Fermi GRB 240629A: Global MASTER-Net observations report
  55. Fermi Gamma-ray Burst Monitor trigger 741362867/240629589 is not a GRB
  56. Fermi Gamma-ray Burst Monitor trigger 741288821/240628732 is not a GRB
  57. GRB 240629A: BALROG localization (Fermi Trigger 741372837 / GRB 240629704)
  58. GRB 240629A: Fermi GBM Final Real-time Localization
  59. Fermi Gamma-ray Burst Monitor trigger 741356809/240629519 is not a GRB
  60. Fermi trigger No 741296200: Global MASTER-Net observations report
  61. Fermi trigger No 741251380: Global MASTER-Net observations report
  62. IPN triangulation of GRB 240619C
  63. GRB 240628A: BALROG localization (Fermi Trigger 741288821 / GRB 240628732)
  64. GRB 240615A: SAI CMO J- band observations
  65. Fermi trigger No 741211696: Global MASTER-Net observations report
  66. Konus-Wind detection of GRB 240619A
  67. Fermi GRB 240625B: Global MASTER-Net observations report
  68. GRB 240624B: CALET Gamma-Ray Burst Monitor detection
  69. GRB 240625B: Fermi GBM Final Real-time Localization
  70. GRB 240625A: Fermi GBM Observation
  71. GRB 240624B: GRBAlpha detection
  72. GRB 240625A: Fermi GBM Final Real-time Localization
  73. GRB240624A: Fermi GBM Observation
  74. GRB240615A: Gemini-North observations of the BAT and XRT positions
  75. Fermi GRB 240624A: Global MASTER-Net observations report
  76. GRB 240624B: Fermi GBM Final Real-time Localization
  77. Fermi trigger No 740949590: Global MASTER-Net observations report
  78. GRB240615A: Gemini-North observations of the BAT and XRT positions
  79. GRB 240624A: Fermi GBM Final Real-time Localization
  80. GRB 240619A: J-band detection with WINTER
  81. Fermi trigger No 740744838: Global MASTER-Net observations report
  82. IPN triangulation of GRB 240615A (short)
  83. X-ray transient EP240618a: Fermi/GBM non-detection
  84. GRB 240619A: GRBAlpha detection
  85. EP240617a: tentative Swift/XRT detection of the afterglow
  86. GRB 240619A: Swift-XRT probable afterglow detection
  87. GRB 240619A: Swift ToO observations
  88. GRB 240619A: CALET Gamma-Ray Burst Monitor detection
  89. GRB 240619C: NuSTAR automated detection of the GRB
  90. GRB 240619A: Fermi GBM Observation
  91. Fermi GBM Sub-Threshold Detection of GRB 240619C
  92. GRB 240619A: GOTO candidate optical afterglow
  93. GRB 240615A: NOT optical observations
  94. Fermi trigger No 740474239: Global MASTER-Net observations report
  95. Fermi GRB 240619A: Global MASTER-Net observations report
  96. Fermi Gamma-ray Burst Monitor trigger 740474239/240619304 is not a GRB
  97. GRB 240619B: Fermi GBM Final Real-time Localization
  98. Fermi trigger No 740430582: Global MASTER-Net observations report
  99. GRB240615A: 1.3m DFOT optical upper limit
  100. GRB 240619A: BALROG localization (Fermi Trigger 740461416 / GRB 240619155)

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