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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"

37764 results found.

  1. LIGO/Virgo/KAGRA S240703ad: Upper limits from Swift/BAT-GUANO
  2. Fermi trigger No 743345551: Global MASTER-Net observations report
  3. Fermi-LAT gamma-ray observations of IceCube-240721A
  4. Fermi Gamma-ray Burst Monitor trigger 743271526/240721680 is not a GRB
  5. Fermi trigger No 743219692: Global MASTER-Net observations report
  6. IceCube-240721A - IceCube observation of a high-energy neutrino candidate track-like event
  7. Fermi Gamma-ray Burst Monitor trigger 743243582/240721356 (GRB 240721A) is not a GRB
  8. GRB 240720B: SVOM/GRM observation
  9. GRB 240721A: Fermi GBM Final Real-time Localization
  10. GRB 240720B: AstroSat CZTI detection of a short burst
  11. Fermi GRB 240720A: Global MASTER-Net observations report
  12. GRB 240720A: AstroSat CZTI detection
  13. GRB 240720A: Fermi GBM observation
  14. GRB 240720A: Swift detection of a burst
  15. Konus-Wind detection of GRB 240718A
  16. GRB 240713A: SVOM/GRM observation
  17. Fermi GRB 240718A: Global MASTER-Net observations report
  18. GRB 240718A: Fermi GBM Observation
  19. GRB 240718A: Fermi-LAT Detection
  20. GRB 240718A: SVOM/GRM observation
  21. GRB 240718A: BALROG localization (Fermi Trigger 742976945 / GRB 240718270)
  22. GRB 240718A: Fermi GBM Final Real-time Localization
  23. GRB 240712A: Swift-BAT refined analysis
  24. GRB 240716A: GECAM-B detection of a long burst
  25. SVOM/GRM In-Flight Trigger of GRB 240716A
  26. GRB 240713A: 2.2m CAHA optical limit
  27. Fermi-LAT gamma-ray observations of IceCube-cascade-240714A
  28. GRB 240715A: Swift/UVOT observations of the XRT sources.
  29. GRB 240715A: Swift-XRT observations
  30. GRB240713A: Swift/UVOT Upper LImits
  31. GRB 240715A: GECAM-C detection of a short burst
  32. Konus-Wind detection of GRB 240715A
  33. GRB 240713A: Swift-XRT observations
  34. GRB 240715A: TRT optical upper limit on one Swift/XRT candidate
  35. GRB 240712A: Swift-XRT refined Analysis
  36. SVOM/GRM In-Flight Trigger of GRB 240715A
  37. GRB 240713A: LAST optical upper limit
  38. GRB 240715A: Swift ToO observations
  39. Fermi GRB 240715A: Global MASTER-Net observations report
  40. GRB 240713A: optical upper limits from the INAF Asiago Observatory
  41. GRB 240715A: Fermi GBM Observation
  42. GRB 240712A ATCA radio observations
  43. GRB240715A: GRANDMA Optical Upper Limits
  44. IPN triangulation of GRB 240715A (short)
  45. GRB 240712A: Swift/UVOT Upper Limits
  46. GRB 240715A: Fermi GBM Final Real-time Localization
  47. GRB 240713A: Tiled Swift observations
  48. GRB 240713A: J-band upper limit from WINTER
  49. GRB 240713A: NOT optical upper limits on three EP/FXT candidates
  50. GRB 240713A: JinShan optical upper limits
  51. GRB 240713A: OHP/T120 optical upper limit
  52. GRB240713A: X-ray follow-up observation with EP-FXT
  53. GRB 240713B: AstroSat CZTI detection of a long burst
  54. Fermi Sub-threshold Observation of GRB240713A
  55. GRB240713A : The first probable GRB Located on-Board SVOM by ECLAIRs
  56. Fermi Gamma-ray Burst Monitor trigger 742413075/240711744 is not a GRB
  57. GRB 240712A: Swift detection of a burst
  58. GRB 240711A: Fermi GBM Final Real-time Localization
  59. Fermi trigger No 742405878: Global MASTER-Net observations report
  60. Fermi trigger No 742317942: Global MASTER-Net observations report
  61. EP240708a: KAIT optical upper limit
  62. Fermi GRB 240710A: Global MASTER-Net observations report
  63. GRB 240710A: Fermi GBM Final Real-time Localization
  64. EP240708a: SVOM/C-GFT optical upper limit
  65. Fermi Gamma-ray Burst Monitor trigger 741911057/240705933 is not a GRB
  66. GRB 240705A: Fermi GBM Final Real-time Localization
  67. Konus-Wind detection of GRB 240627A
  68. IPN triangulation of GRB 240628B (short)
  69. EP240703a: KAIT optical upper limit
  70. EP240703a: BTA observations
  71. EP240703a/GRB 240703A: TRT optical candidate likely not real
  72. EP240703a/GRB 240703A: TRT and JinShan decaying optical afterglow candidate
  73. IPN triangulation of GRB 240627A
  74. GRB 240619A: Host galaxy redshift from VLT/X-shooter
  75. The first three GRBs detected by SVOM: X-ray Upper Limits from EP-WXT
  76. Konus-Wind detection of GRB 240703A (a counterpart of EP240703a)
  77. The first three GRBs detected by SVOM: GRB 240627B, GRB 240629A and GRB 240702A
  78. GRB 240702A: BALROG localization (Fermi Trigger / GRB 240702885)
  79. Fermi GRB 240702A: Global MASTER-Net observations report
  80. GRB 240702A: Fermi GBM Final Real-time Localization
  81. LIGO/Virgo/KAGRA S240627by: Upper limits from Swift/BAT-GUANO
  82. Fermi Gamma-ray Burst Monitor trigger 741448122/240630575 is not a GRB
  83. GRB 240627A: CALET Gamma-Ray Burst Monitor detection
  84. Fermi trigger No 741448122: Global MASTER-Net observations report
  85. LIGO/Virgo/KAGRA S240629by: Upper limits from Fermi-GBM Observations
  86. Fermi trigger No 741356809: Global MASTER-Net observations report
  87. Fermi GRB 240629A: Global MASTER-Net observations report
  88. Fermi Gamma-ray Burst Monitor trigger 741362867/240629589 is not a GRB
  89. Fermi Gamma-ray Burst Monitor trigger 741288821/240628732 is not a GRB
  90. GRB 240629A: BALROG localization (Fermi Trigger 741372837 / GRB 240629704)
  91. GRB 240629A: Fermi GBM Final Real-time Localization
  92. Fermi Gamma-ray Burst Monitor trigger 741356809/240629519 is not a GRB
  93. Fermi trigger No 741296200: Global MASTER-Net observations report
  94. Fermi trigger No 741251380: Global MASTER-Net observations report
  95. IPN triangulation of GRB 240619C
  96. GRB 240628A: BALROG localization (Fermi Trigger 741288821 / GRB 240628732)
  97. GRB 240627A: NuSTAR Detection of the long GRB
  98. GRB 240615A: SAI CMO J- band observations
  99. GRB 240627A: AstroSat CZTI detection
  100. Fermi trigger No 741211696: Global MASTER-Net observations report

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