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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"

37766 results found.

  1. Fermi trigger No 743315411: Global MASTER-Net observations report
  2. LIGO/Virgo/KAGRA S240716b: Upper limits from Swift/BAT-GUANO
  3. LIGO/Virgo/KAGRA S240703ad: Upper limits from Swift/BAT-GUANO
  4. Fermi trigger No 743345551: Global MASTER-Net observations report
  5. Fermi-LAT gamma-ray observations of IceCube-240721A
  6. Fermi Gamma-ray Burst Monitor trigger 743271526/240721680 is not a GRB
  7. Fermi trigger No 743219692: Global MASTER-Net observations report
  8. IceCube-240721A - IceCube observation of a high-energy neutrino candidate track-like event
  9. Fermi Gamma-ray Burst Monitor trigger 743243582/240721356 (GRB 240721A) is not a GRB
  10. GRB 240720B: SVOM/GRM observation
  11. GRB 240721A: Fermi GBM Final Real-time Localization
  12. GRB 240720B: AstroSat CZTI detection of a short burst
  13. Fermi GRB 240720A: Global MASTER-Net observations report
  14. GRB 240720A: AstroSat CZTI detection
  15. GRB 240720A: Fermi GBM observation
  16. GRB 240720A: Swift detection of a burst
  17. Konus-Wind detection of GRB 240718A
  18. GRB 240713A: SVOM/GRM observation
  19. Fermi GRB 240718A: Global MASTER-Net observations report
  20. GRB 240718A: Fermi GBM Observation
  21. GRB 240718A: Fermi-LAT Detection
  22. GRB 240718A: SVOM/GRM observation
  23. GRB 240718A: BALROG localization (Fermi Trigger 742976945 / GRB 240718270)
  24. GRB 240718A: Fermi GBM Final Real-time Localization
  25. GRB 240712A: Swift-BAT refined analysis
  26. GRB 240716A: GECAM-B detection of a long burst
  27. SVOM/GRM In-Flight Trigger of GRB 240716A
  28. GRB 240713A: 2.2m CAHA optical limit
  29. Fermi-LAT gamma-ray observations of IceCube-cascade-240714A
  30. GRB 240715A: Swift/UVOT observations of the XRT sources.
  31. GRB 240715A: Swift-XRT observations
  32. GRB240713A: Swift/UVOT Upper LImits
  33. GRB 240715A: GECAM-C detection of a short burst
  34. Konus-Wind detection of GRB 240715A
  35. GRB 240713A: Swift-XRT observations
  36. GRB 240715A: TRT optical upper limit on one Swift/XRT candidate
  37. GRB 240712A: Swift-XRT refined Analysis
  38. SVOM/GRM In-Flight Trigger of GRB 240715A
  39. GRB 240713A: LAST optical upper limit
  40. GRB 240715A: Swift ToO observations
  41. Fermi GRB 240715A: Global MASTER-Net observations report
  42. GRB 240713A: optical upper limits from the INAF Asiago Observatory
  43. GRB 240715A: Fermi GBM Observation
  44. GRB 240712A ATCA radio observations
  45. GRB240715A: GRANDMA Optical Upper Limits
  46. IPN triangulation of GRB 240715A (short)
  47. GRB 240712A: Swift/UVOT Upper Limits
  48. GRB 240715A: Fermi GBM Final Real-time Localization
  49. GRB 240713A: Tiled Swift observations
  50. GRB 240713A: J-band upper limit from WINTER
  51. GRB 240713A: NOT optical upper limits on three EP/FXT candidates
  52. GRB 240713A: JinShan optical upper limits
  53. GRB 240713A: OHP/T120 optical upper limit
  54. GRB240713A: X-ray follow-up observation with EP-FXT
  55. GRB 240713B: AstroSat CZTI detection of a long burst
  56. Fermi Sub-threshold Observation of GRB240713A
  57. GRB240713A : The first probable GRB Located on-Board SVOM by ECLAIRs
  58. Fermi Gamma-ray Burst Monitor trigger 742413075/240711744 is not a GRB
  59. GRB 240712A: Swift detection of a burst
  60. GRB 240711A: Fermi GBM Final Real-time Localization
  61. Fermi trigger No 742405878: Global MASTER-Net observations report
  62. Fermi trigger No 742317942: Global MASTER-Net observations report
  63. EP240708a: KAIT optical upper limit
  64. Fermi GRB 240710A: Global MASTER-Net observations report
  65. GRB 240710A: Fermi GBM Final Real-time Localization
  66. EP240708a: SVOM/C-GFT optical upper limit
  67. Fermi Gamma-ray Burst Monitor trigger 741911057/240705933 is not a GRB
  68. GRB 240705A: Fermi GBM Final Real-time Localization
  69. Konus-Wind detection of GRB 240627A
  70. IPN triangulation of GRB 240628B (short)
  71. EP240703a: KAIT optical upper limit
  72. EP240703a: BTA observations
  73. EP240703a/GRB 240703A: TRT optical candidate likely not real
  74. EP240703a/GRB 240703A: TRT and JinShan decaying optical afterglow candidate
  75. IPN triangulation of GRB 240627A
  76. GRB 240619A: Host galaxy redshift from VLT/X-shooter
  77. The first three GRBs detected by SVOM: X-ray Upper Limits from EP-WXT
  78. Konus-Wind detection of GRB 240703A (a counterpart of EP240703a)
  79. The first three GRBs detected by SVOM: GRB 240627B, GRB 240629A and GRB 240702A
  80. GRB 240702A: BALROG localization (Fermi Trigger / GRB 240702885)
  81. Fermi GRB 240702A: Global MASTER-Net observations report
  82. GRB 240702A: Fermi GBM Final Real-time Localization
  83. LIGO/Virgo/KAGRA S240627by: Upper limits from Swift/BAT-GUANO
  84. Fermi Gamma-ray Burst Monitor trigger 741448122/240630575 is not a GRB
  85. GRB 240627A: CALET Gamma-Ray Burst Monitor detection
  86. Fermi trigger No 741448122: Global MASTER-Net observations report
  87. LIGO/Virgo/KAGRA S240629by: Upper limits from Fermi-GBM Observations
  88. Fermi trigger No 741356809: Global MASTER-Net observations report
  89. Fermi GRB 240629A: Global MASTER-Net observations report
  90. Fermi Gamma-ray Burst Monitor trigger 741362867/240629589 is not a GRB
  91. Fermi Gamma-ray Burst Monitor trigger 741288821/240628732 is not a GRB
  92. GRB 240629A: BALROG localization (Fermi Trigger 741372837 / GRB 240629704)
  93. GRB 240629A: Fermi GBM Final Real-time Localization
  94. Fermi Gamma-ray Burst Monitor trigger 741356809/240629519 is not a GRB
  95. Fermi trigger No 741296200: Global MASTER-Net observations report
  96. Fermi trigger No 741251380: Global MASTER-Net observations report
  97. IPN triangulation of GRB 240619C
  98. GRB 240628A: BALROG localization (Fermi Trigger 741288821 / GRB 240628732)
  99. GRB 240627A: NuSTAR Detection of the long GRB
  100. GRB 240615A: SAI CMO J- band observations

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