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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"

24494 results found.

  1. GRB 241018A: Detection of a bright long GRB by SVOM
  2. GRB 241017A: Swift-XRT observations
  3. GRB 241016B: Swift/BAT-GUANO localization skymap of a short burst
  4. Fermi trigger No 750788395: Global MASTER-Net observations report
  5. GRB 241016B: SVOM/GRM observation
  6. GRB241016C: Fermi GBM Final Localization
  7. GRB 241017A : Detection of a weak and soft long duration GRB by SVOM/ECLAIRs
  8. Fermi GRB 241016B: Global MASTER-Net observations report
  9. GRB 241016B: Fermi GBM Final Localization
  10. Fermi GRB 241016A: Global MASTER-Net observations report
  11. GRB 241016A: Fermi GBM Final Real-time Localization
  12. IceCube alert 139977_2910365 retraction
  13. IceCube Alert 241016.04: Global MASTER-Net observations report
  14. GRB 241010A: Swift-BAT refined analysis
  15. GRB 241013B: Fermi GBM Observation
  16. GRB 241013B: Swift/BAT-GUANO localization skymap of a burst
  17. GRB 241013A: Fermi GBM Observation
  18. GRB241013A: REM observations
  19. GRB 241013B: SVOM/GRM observation
  20. Fermi GRB 241013B: Global MASTER-Net observations report
  21. Integral GRB241013.04: Global MASTER-Net observations report
  22. GRB 241013B: Fermi GBM Final Real-time Localization
  23. GRB 241013A: a long GRB detected by INTEGRAL
  24. GRB 241013A: Fermi GBM Final Real-time Localization
  25. LIGO/Virgo/KAGRA S241009em: Updated Sky localization
  26. LIGO/Virgo/KAGRA S241011k: Updated Sky localization
  27. LIGO/Virgo/KAGRA S241011k: NED Galaxies in the Localization Volume
  28. LIGO/Virgo/KAGRA S241011k: Identification of a GW compact binary merger candidate
  29. GRB 241011A: Fermi GBM Final Real-time Localization
  30. LIGO/Virgo/KAGRA S241007bw: Updated Sky localization
  31. Fermi trigger No 750211959: Global MASTER-Net observations report
  32. Swift GRB 241010A: Global MASTER-Net observations report
  33. Fermi trigger No 750291012: Global MASTER-Net observations report
  34. LIGO/Virgo/KAGRA S241009an: Updated Sky localization
  35. Fermi GRB 241010B: Global MASTER-Net observations report
  36. GRB 241010B: Fermi GBM Final Real-time Localization
  37. IceCube-241006A: Upper limits from a search for additional neutrino events in IceCube
  38. GRB 241010A: Swift detection of a burst with an optical counterpart
  39. Fermi-LAT Gamma-ray Observations of IceCube-241006A
  40. GRB 241006A: Swift-BAT refined analysis
  41. LIGO/Virgo/KAGRA S241009l: Updated Sky localization
  42. LIGO/Virgo/KAGRA S241009em: Identification of a GW compact binary merger candidate
  43. GRB 241009A : Detection of a long duration GRB by SVOM/ECLAIRs
  44. GRB 241008A: Fermi GBM Observation
  45. GRB 241008A: Fermi-LAT detection
  46. LIGO/Virgo/KAGRA S241009an: Identification of a GW compact binary merger candidate
  47. LIGO/Virgo/KAGRA S241009l: Identification of a GW compact binary merger candidate
  48. Fermi GRB 241008A: Global MASTER-Net observations report
  49. GRB 241008A: BALROG localization (Fermi Trigger 750117609 / GRB 241008917)
  50. GRB 241008A: Fermi GBM Final Real-time Localization
  51. IceCube-241006A: No candidates from the Zwicky Transient Facility
  52. EP240930a / GRB 240930B: CrAO ZTSH optical upper limit
  53. GRB 241002B: PRIME near-infrared detection in 3rd epoch
  54. Fermi-LAT Gamma-ray Observations of NuEm-240926A
  55. GRB 240910A: LBT optical observations
  56. EP trigger ID 01709065118: KAIT confirmation of the stellar flare
  57. GRB 241006A: SVOM/VT follow-up and optical upper limit
  58. LIGO/Virgo/KAGRA S241007bw: Identification of a GW compact binary merger candidate
  59. IceCube Alert 241006.94: Global MASTER-Net observations report
  60. IceCube-241006A - IceCube observation of a high-energy neutrino candidate track-like event
  61. GRB 241006A: Swift detection of a burst
  62. Swift GRB241006.91: Global MASTER-Net observations report
  63. LIGO/Virgo/KAGRA S241006k: Identification of a GW compact binary merger candidate
  64. LIGO/Virgo/KAGRA S241005bo: Retraction of GW compact binary merger candidate
  65. Fermi trigger No 749721670: Global MASTER-Net observations report
  66. GRB 241004A: SVOM/GRM observation
  67. EP trigger ID 01709065118: the X-ray transient is likely a stellar flare event
  68. GRB 241002B: PRIME near-infrared detection in 2nd epoch
  69. GRB 241002B: Fermi GBM Observation
  70. Fermi trigger No 749735279: Global MASTER-Net observations report
  71. Fermi trigger No 749630753: Global MASTER-Net observations report
  72. Fermi trigger No 749693019: Global MASTER-Net observations report
  73. GRB 241002B: Swift-XRT observations
  74. GRB 241002A: Swift-BAT refined analysis
  75. GRB 241002B: Swift/BAT-GUANO localization skymap of a burst
  76. Konus-Wind detection of GRB 240926A
  77. LIGO/Virgo/KAGRA S240925n: NED Galaxies in the Localization Volume
  78. Fermi-GBM Sub-Threshold Detection of GRB 241002D
  79. IPN triangulation of GRB 240930B / EP 240930a
  80. GRB 241001A : SVOM/VT optical detection
  81. GRB 241002D: SVOM/GRM observation
  82. GRB 241002B: ULL-ASTRO-MASTER LCOGT 0.4m + QHY600 detection of the GOTO optical counterpart candidate AT 2024xbg / GOTO24gpc
  83. GRB 240930B: CALET Gamma-Ray Burst Monitor detection
  84. GRB 240929A: SAO RAS, Mondy, and CrAO optical observations
  85. GRB 241002C : MITSuME Akeno optical upper limits
  86. LIGO/Virgo/KAGRA S240925n: Updated Sky localization
  87. NuEm-240926A: Upper limits from a search for coincident neutrino events in IceCube
  88. GRB241001A: REM optical/NIR upper limits
  89. LIGO/Virgo/KAGRA S241002e: Updated Sky localization
  90. GRB 241002A: LCOGT Optical Upper Limits
  91. GRB 241001A: VLT/X-shooter redshift
  92. GRB 241002B: GOTO optical counterpart candidate
  93. EP trigger ID 01709064214: GOTO confirms detection as a flare star
  94. GRB 241002C : Detection of a long soft transient by SVOM/ECLAIRs
  95. GRB 240929A: Liverpool Telescope prompt followup observations
  96. Fermi GRB 241002B: Global MASTER-Net observations report
  97. GRB 241001A: Swift-XRT observations
  98. GRB 241002B: Fermi GBM Final Real-time Localization
  99. LIGO/Virgo/KAGRA S241002e: Identification of a GW compact binary merger candidate
  100. GRB 241002A: Swift detection of a burst

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