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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"

36314 results found.

  1. EP240708a: SVOM/C-GFT optical upper limit
  2. Fermi Gamma-ray Burst Monitor trigger 741911057/240705933 is not a GRB
  3. GRB 240705A: Fermi GBM Final Real-time Localization
  4. Konus-Wind detection of GRB 240627A
  5. IPN triangulation of GRB 240628B (short)
  6. EP240703a: KAIT optical upper limit
  7. EP240703a: BTA observations
  8. EP240703a/GRB 240703A: TRT optical candidate likely not real
  9. EP240703a/GRB 240703A: TRT and JinShan decaying optical afterglow candidate
  10. IPN triangulation of GRB 240627A
  11. GRB 240619A: Host galaxy redshift from VLT/X-shooter
  12. The first three GRBs detected by SVOM: X-ray Upper Limits from EP-WXT
  13. Konus-Wind detection of GRB 240703A (a counterpart of EP240703a)
  14. The first three GRBs detected by SVOM: GRB 240627B, GRB 240629A and GRB 240702A
  15. GRB 240702A: BALROG localization (Fermi Trigger / GRB 240702885)
  16. Fermi GRB 240702A: Global MASTER-Net observations report
  17. GRB 240702A: Fermi GBM Final Real-time Localization
  18. LIGO/Virgo/KAGRA S240627by: Upper limits from Swift/BAT-GUANO
  19. Fermi Gamma-ray Burst Monitor trigger 741448122/240630575 is not a GRB
  20. GRB 240627A: CALET Gamma-Ray Burst Monitor detection
  21. LIGO/Virgo/KAGRA S240629by: Upper limits from Fermi-GBM Observations
  22. Fermi GRB 240629A: Global MASTER-Net observations report
  23. Fermi Gamma-ray Burst Monitor trigger 741362867/240629589 is not a GRB
  24. Fermi Gamma-ray Burst Monitor trigger 741288821/240628732 is not a GRB
  25. GRB 240629A: BALROG localization (Fermi Trigger 741372837 / GRB 240629704)
  26. GRB 240629A: Fermi GBM Final Real-time Localization
  27. Fermi Gamma-ray Burst Monitor trigger 741356809/240629519 is not a GRB
  28. IPN triangulation of GRB 240619C
  29. GRB 240628A: BALROG localization (Fermi Trigger 741288821 / GRB 240628732)
  30. GRB 240627A: NuSTAR Detection of the long GRB
  31. GRB 240615A: SAI CMO J- band observations
  32. GRB 240627A: AstroSat CZTI detection
  33. EP240626a: Montarrenti Observatory optical upper limit
  34. EP240626a: KAIT optical upper limit
  35. GRB 240624A: Swift-BAT refined analysis
  36. Konus-Wind detection of GRB 240619A
  37. Fermi GRB 240625B: Global MASTER-Net observations report
  38. GRB 240624B: CALET Gamma-Ray Burst Monitor detection
  39. GRB 240625B: Fermi GBM Final Real-time Localization
  40. GRB 240625A: Fermi GBM Observation
  41. GRB 240624B: GRBAlpha detection
  42. GRB 240625A: Fermi GBM Final Real-time Localization
  43. GRB240624A: Fermi GBM Observation
  44. LIGO/Virgo/KAGRA S240622h: Upper limits from Swift/BAT-GUANO
  45. LIGO/Virgo/KAGRA S240621dy: Upper limits from Swift/BAT-GUANO
  46. LIGO/Virgo/KAGRA S240618ah: Upper limits from Swift/BAT-GUANO
  47. Swift GRB 240624A: Global MASTER-Net observations report
  48. GRB240615A: Gemini-North observations of the BAT and XRT positions
  49. Fermi GRB 240624A: Global MASTER-Net observations report
  50. GRB 240624B: Fermi GBM Final Real-time Localization
  51. GRB240615A: Gemini-North observations of the BAT and XRT positions
  52. GRB 240624A: Fermi GBM Final Real-time Localization
  53. GRB 240619A: detection of a radio counterpart with AMI-LA
  54. GRB 240624A: Swift detection of a burst
  55. GRB 240619A: J-band detection with WINTER (duplicate submission of GCN 36739)
  56. GRB 240619A: J-band detection with WINTER
  57. EP240618a: NOT optical counterpart candidate
  58. GRB 240529A: JinShan optical observations
  59. IPN triangulation of GRB 240615A (short)
  60. GRB 240619A: GRBAlpha detection
  61. GRB 240619A: Swift-XRT probable afterglow detection
  62. GRB 240619A: Swift ToO observations
  63. GRB 240619A: CALET Gamma-Ray Burst Monitor detection
  64. GRB 240619C: NuSTAR automated detection of the GRB
  65. GRB 240619A: Fermi GBM Observation
  66. Fermi GBM Sub-Threshold Detection of GRB 240619C
  67. GRB 240619A: GOTO candidate optical afterglow
  68. EP240618a: Abastumani optical observationsEP240618a
  69. GRB 240615A: NOT optical observations
  70. GRB 240619C: AstroSat CZTI detection
  71. Fermi GRB 240619A: Global MASTER-Net observations report
  72. EP240617a: STEP/T80S optical limits
  73. GRB 240615A: possible transient detection from Wendelstein observations
  74. Fermi Gamma-ray Burst Monitor trigger 740474239/240619304 is not a GRB
  75. GRB 240619B: Fermi GBM Final Real-time Localization
  76. GRB240615A: 1.3m DFOT optical upper limit
  77. GRB 240619A: BALROG localization (Fermi Trigger 740461416 / GRB 240619155)
  78. GRB 240619A: Fermi GBM Final Real-time Localization
  79. EP240617a: BOOTES-6/DPRT optical upper limit
  80. EP240617a is likely a GRB event
  81. LIGO/Virgo/KAGRA S240615ea: Upper limits from Swift/BAT-GUANO
  82. LIGO/Virgo/KAGRA S240615dg: Upper limits from Swift/BAT-GUANO
  83. GRB 240615A: J-band upper limits from WINTER
  84. GRB 240615A: Fermi GBM Observation
  85. GRB 240615A: Swift-XRT observations
  86. GRB 240615A: GECAM detection
  87. GRB 240615A: FLWO-1.2m optical upper limits
  88. Fermi GRB 240616A: Global MASTER-Net observations report
  89. Konus-Wind detection of GRB 240615A (short/hard)
  90. GRB 240615A: GOTO optical upper limits
  91. GRB 240616A: Fermi GBM Final Real-time Localization
  92. GRB 240615A: Swift ToO observations
  93. GRB 240615A: Swift/BAT-GUANO arcminute localization of a short burst
  94. GRB 240615A: Fermi GBM Final Real-time Localization
  95. GRB 240603A: VZLUSAT-2 detection
  96. GRB 240612A: GRBAlpha detection
  97. GRB 240613A: Fermi GBM Final Real-time Localization
  98. Fermi GRB 240612B: Global MASTER-Net observations report
  99. Fermi GRB 240612A: Global MASTER-Net observations report
  100. GRB 240612B: Fermi GBM Final Real-time Localization

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