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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"

11614 results found.

  1. GRB 240805A: A long GRB detected by INTEGRAL
  2. GRB 240805A: Fermi GBM Final Real-time Localization
  3. Fermi GRB 240804A: Global MASTER-Net observations report
  4. GRB 240804A: Fermi GBM Final Real-time Localization
  5. Fermi trigger No 744459130: Global MASTER-Net observations report
  6. Fermi Gamma-ray Burst Monitor trigger 744459130/240804425 is not a GRB
  7. Fermi trigger No 744278264: Global MASTER-Net observations report
  8. GRB 240801B: AstroSat CZTI Updated classification - likely a solar flare
  9. Fermi GBM trigger 744179961 / 240801194 can not be confirmed as a GRB
  10. Fermi trigger No 744204856: Global MASTER-Net observations report
  11. GRB 240801B: AstroSat CZTI detection of a bright long burst
  12. Fermi GRB 240801A: Global MASTER-Net observations report
  13. GRB 240801A: Fermi GBM Final Real-time Localization
  14. GRB 240731A: Fermi GBM Final Localization
  15. Fermi trigger No 744128417: Global MASTER-Net observations report
  16. Fermi trigger No 744083370: Global MASTER-Net observations report
  17. GRB 240731A: AstroSat CZTI detection
  18. Fermi Gamma-ray Burst Monitor trigger 744061103/240730818 is not a GRB
  19. Fermi GRB 240730B: Global MASTER-Net observations report
  20. GRB 240730B: Fermi GBM Final Real-time Localization
  21. Fermi trigger No 743953682: Global MASTER-Net observations report
  22. Fermi Gamma-ray Burst Monitor trigger 743953682/240729575 is not a GRB
  23. GRB 240727B: Swift-XRT observations
  24. Fermi GRB 240727A: Global MASTER-Net observations report
  25. Fermi trigger No 743868421: Global MASTER-Net observations report
  26. Fermi Gamma-ray Burst Monitor trigger 743868421/240728588 is not a GRB
  27. GRB 240727D: Correction to the GRB name in GCN 36958
  28. GRB 240727A: Fermi GBM Final Real-time Localization
  29. GRB 240718A: GRBAlpha detection
  30. GRB 240710B: GRBAlpha detection
  31. Fermi GRB 240726A: Global MASTER-Net observations report
  32. GRB 240727B: Fermi GBM Observation
  33. GRB 240727B: Swift ToO observations
  34. GRB 240727B: Swift/BAT-GUANO arcminute localization of a long burst
  35. GRB 240726A: SVOM/GRM observation
  36. GRB 240727B: AstroSat CZTI detection
  37. GRB 240726A: AstroSat CZTI detection of a short burst
  38. GRB 240726A: Fermi GBM Final Real-time Localization
  39. Fermi-LAT gamma-ray observations of IceCube-240725A
  40. IceCube-240725A - IceCube observation of a high-energy neutrino candidate track-like event
  41. Fermi trigger No 743418632: Global MASTER-Net observations report
  42. Fermi trigger No 743315411: Global MASTER-Net observations report
  43. Fermi trigger No 743345551: Global MASTER-Net observations report
  44. Fermi-LAT gamma-ray observations of IceCube-240721A
  45. Fermi Gamma-ray Burst Monitor trigger 743271526/240721680 is not a GRB
  46. Fermi trigger No 743219692: Global MASTER-Net observations report
  47. IceCube-240721A - IceCube observation of a high-energy neutrino candidate track-like event
  48. Fermi Gamma-ray Burst Monitor trigger 743243582/240721356 (GRB 240721A) is not a GRB
  49. GRB 240721A: Fermi GBM Final Real-time Localization
  50. Fermi GRB 240720A: Global MASTER-Net observations report
  51. GRB 240720A: AstroSat CZTI detection
  52. GRB 240720A: Fermi GBM observation
  53. Konus-Wind detection of GRB 240718A
  54. GRB 240713A: SVOM/GRM observation
  55. Fermi GRB 240718A: Global MASTER-Net observations report
  56. GRB 240718A: Fermi GBM Observation
  57. GRB 240718A: Fermi-LAT Detection
  58. GRB 240718A: SVOM/GRM observation
  59. GRB 240718A: BALROG localization (Fermi Trigger 742976945 / GRB 240718270)
  60. GRB 240718A: Fermi GBM Final Real-time Localization
  61. Fermi-LAT gamma-ray observations of IceCube-cascade-240714A
  62. GRB 240715A: Swift/UVOT observations of the XRT sources.
  63. GRB 240715A: GECAM-C detection of a short burst
  64. Konus-Wind detection of GRB 240715A
  65. GRB 240715A: TRT optical upper limit on one Swift/XRT candidate
  66. SVOM/GRM In-Flight Trigger of GRB 240715A
  67. GRB 240713A: LAST optical upper limit
  68. Fermi GRB 240715A: Global MASTER-Net observations report
  69. GRB 240713A: optical upper limits from the INAF Asiago Observatory
  70. GRB 240715A: Fermi GBM Observation
  71. GRB240715A: GRANDMA Optical Upper Limits
  72. IPN triangulation of GRB 240715A (short)
  73. GRB 240715A: Fermi GBM Final Real-time Localization
  74. GRB 240713A: J-band upper limit from WINTER
  75. GRB 240713A: NOT optical upper limits on three EP/FXT candidates
  76. GRB 240713A: JinShan optical upper limits
  77. GRB 240713A: OHP/T120 optical upper limit
  78. GRB240713A: X-ray follow-up observation with EP-FXT
  79. Fermi Sub-threshold Observation of GRB240713A
  80. Fermi Gamma-ray Burst Monitor trigger 742413075/240711744 is not a GRB
  81. GRB 240711A: Fermi GBM Final Real-time Localization
  82. Fermi trigger No 742405878: Global MASTER-Net observations report
  83. Fermi trigger No 742317942: Global MASTER-Net observations report
  84. Fermi GRB 240710A: Global MASTER-Net observations report
  85. GRB 240710A: Fermi GBM Final Real-time Localization
  86. Fermi Gamma-ray Burst Monitor trigger 741911057/240705933 is not a GRB
  87. GRB 240705A: Fermi GBM Final Real-time Localization
  88. IPN triangulation of GRB 240628B (short)
  89. IPN triangulation of GRB 240627A
  90. GRB 240619A: Host galaxy redshift from VLT/X-shooter
  91. The first three GRBs detected by SVOM: GRB 240627B, GRB 240629A and GRB 240702A
  92. GRB 240702A: BALROG localization (Fermi Trigger / GRB 240702885)
  93. Fermi GRB 240702A: Global MASTER-Net observations report
  94. GRB 240702A: Fermi GBM Final Real-time Localization
  95. Fermi Gamma-ray Burst Monitor trigger 741448122/240630575 is not a GRB
  96. Fermi trigger No 741448122: Global MASTER-Net observations report
  97. LIGO/Virgo/KAGRA S240629by: Upper limits from Fermi-GBM Observations
  98. Fermi trigger No 741356809: Global MASTER-Net observations report
  99. Fermi GRB 240629A: Global MASTER-Net observations report
  100. Fermi Gamma-ray Burst Monitor trigger 741362867/240629589 is not a GRB

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