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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"

11622 results found.

  1. GRB 240624B: VZLUSAT-2 detection
  2. GRB 240619C: VZLUSAT-2 detection
  3. Fermi trigger No 744544656: Global MASTER-Net observations report
  4. GRB 240805A: SVOM/GRM observation
  5. Fermi GRB 240805A: Global MASTER-Net observations report
  6. Fermi Gamma-ray Burst Monitor trigger 744558410/240805574 is not a GRB
  7. GRB 240805A: Fermi-LAT detection
  8. GRB 240805A: INTEGRAL spectral analysis
  9. GRB 240805A: A long GRB detected by INTEGRAL
  10. GRB 240805A: Fermi GBM Final Real-time Localization
  11. Fermi GRB 240804A: Global MASTER-Net observations report
  12. GRB 240804A: Fermi GBM Final Real-time Localization
  13. Fermi trigger No 744459130: Global MASTER-Net observations report
  14. Fermi Gamma-ray Burst Monitor trigger 744459130/240804425 is not a GRB
  15. Fermi trigger No 744278264: Global MASTER-Net observations report
  16. GRB 240801B: AstroSat CZTI Updated classification - likely a solar flare
  17. Fermi GBM trigger 744179961 / 240801194 can not be confirmed as a GRB
  18. Fermi trigger No 744204856: Global MASTER-Net observations report
  19. GRB 240801B: AstroSat CZTI detection of a bright long burst
  20. Fermi GRB 240801A: Global MASTER-Net observations report
  21. GRB 240801A: Fermi GBM Final Real-time Localization
  22. GRB 240731A: Fermi GBM Final Localization
  23. Fermi trigger No 744128417: Global MASTER-Net observations report
  24. Fermi trigger No 744083370: Global MASTER-Net observations report
  25. GRB 240731A: AstroSat CZTI detection
  26. Fermi Gamma-ray Burst Monitor trigger 744061103/240730818 is not a GRB
  27. Fermi GRB 240730B: Global MASTER-Net observations report
  28. GRB 240730B: Fermi GBM Final Real-time Localization
  29. Fermi trigger No 743953682: Global MASTER-Net observations report
  30. Fermi Gamma-ray Burst Monitor trigger 743953682/240729575 is not a GRB
  31. GRB 240727B: Swift-XRT observations
  32. Fermi GRB 240727A: Global MASTER-Net observations report
  33. Fermi trigger No 743868421: Global MASTER-Net observations report
  34. Fermi Gamma-ray Burst Monitor trigger 743868421/240728588 is not a GRB
  35. GRB 240727D: Correction to the GRB name in GCN 36958
  36. GRB 240727A: Fermi GBM Final Real-time Localization
  37. GRB 240718A: GRBAlpha detection
  38. GRB 240710B: GRBAlpha detection
  39. Fermi GRB 240726A: Global MASTER-Net observations report
  40. GRB 240727B: Fermi GBM Observation
  41. GRB 240727B: Swift ToO observations
  42. GRB 240727B: Swift/BAT-GUANO arcminute localization of a long burst
  43. GRB 240726A: SVOM/GRM observation
  44. GRB 240727B: AstroSat CZTI detection
  45. GRB 240726A: AstroSat CZTI detection of a short burst
  46. GRB 240726A: Fermi GBM Final Real-time Localization
  47. Fermi-LAT gamma-ray observations of IceCube-240725A
  48. IceCube-240725A - IceCube observation of a high-energy neutrino candidate track-like event
  49. Fermi trigger No 743418632: Global MASTER-Net observations report
  50. Fermi trigger No 743315411: Global MASTER-Net observations report
  51. Fermi trigger No 743345551: Global MASTER-Net observations report
  52. Fermi-LAT gamma-ray observations of IceCube-240721A
  53. Fermi Gamma-ray Burst Monitor trigger 743271526/240721680 is not a GRB
  54. Fermi trigger No 743219692: Global MASTER-Net observations report
  55. IceCube-240721A - IceCube observation of a high-energy neutrino candidate track-like event
  56. Fermi Gamma-ray Burst Monitor trigger 743243582/240721356 (GRB 240721A) is not a GRB
  57. GRB 240721A: Fermi GBM Final Real-time Localization
  58. Fermi GRB 240720A: Global MASTER-Net observations report
  59. GRB 240720A: AstroSat CZTI detection
  60. GRB 240720A: Fermi GBM observation
  61. Konus-Wind detection of GRB 240718A
  62. GRB 240713A: SVOM/GRM observation
  63. Fermi GRB 240718A: Global MASTER-Net observations report
  64. GRB 240718A: Fermi GBM Observation
  65. GRB 240718A: Fermi-LAT Detection
  66. GRB 240718A: SVOM/GRM observation
  67. GRB 240718A: BALROG localization (Fermi Trigger 742976945 / GRB 240718270)
  68. GRB 240718A: Fermi GBM Final Real-time Localization
  69. Fermi-LAT gamma-ray observations of IceCube-cascade-240714A
  70. GRB 240715A: Swift/UVOT observations of the XRT sources.
  71. GRB 240715A: GECAM-C detection of a short burst
  72. Konus-Wind detection of GRB 240715A
  73. GRB 240715A: TRT optical upper limit on one Swift/XRT candidate
  74. SVOM/GRM In-Flight Trigger of GRB 240715A
  75. GRB 240713A: LAST optical upper limit
  76. Fermi GRB 240715A: Global MASTER-Net observations report
  77. GRB 240713A: optical upper limits from the INAF Asiago Observatory
  78. GRB 240715A: Fermi GBM Observation
  79. GRB240715A: GRANDMA Optical Upper Limits
  80. IPN triangulation of GRB 240715A (short)
  81. GRB 240715A: Fermi GBM Final Real-time Localization
  82. GRB 240713A: J-band upper limit from WINTER
  83. GRB 240713A: NOT optical upper limits on three EP/FXT candidates
  84. GRB 240713A: JinShan optical upper limits
  85. GRB 240713A: OHP/T120 optical upper limit
  86. GRB240713A: X-ray follow-up observation with EP-FXT
  87. Fermi Sub-threshold Observation of GRB240713A
  88. Fermi Gamma-ray Burst Monitor trigger 742413075/240711744 is not a GRB
  89. GRB 240711A: Fermi GBM Final Real-time Localization
  90. Fermi trigger No 742405878: Global MASTER-Net observations report
  91. Fermi trigger No 742317942: Global MASTER-Net observations report
  92. Fermi GRB 240710A: Global MASTER-Net observations report
  93. GRB 240710A: Fermi GBM Final Real-time Localization
  94. Fermi Gamma-ray Burst Monitor trigger 741911057/240705933 is not a GRB
  95. GRB 240705A: Fermi GBM Final Real-time Localization
  96. IPN triangulation of GRB 240628B (short)
  97. IPN triangulation of GRB 240627A
  98. GRB 240619A: Host galaxy redshift from VLT/X-shooter
  99. The first three GRBs detected by SVOM: GRB 240627B, GRB 240629A and GRB 240702A
  100. GRB 240702A: BALROG localization (Fermi Trigger / GRB 240702885)

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