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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"

24511 results found.

  1. EP241021a: VLT/FORS2 redshift z = 0.75
  2. Fermi trigger No 751449953: Global MASTER-Net observations report
  3. EP241021a: EP-FXT follow-up observation update
  4. IPN triangulation of GRB 241021A (long)
  5. EP241021a: 1.3m DFOT Optical observations
  6. GRB 241018A: SVOM/C-GFT optical observations
  7. EP EP241021a: Global MASTER-Net observations report
  8. GRB241017A: 1.3m DFOT optical upper limit
  9. GRB 241018A: 1.3m DFOT Optical upper limit
  10. IceCube-Cascade 241019A: Upper limits from a search for additional neutrino events in IceCube
  11. Konus-Wind detection of GRB 241018A
  12. GRB 241018A: SVOM/GRM observation
  13. GRB 241018A/sb24101802: Mephisto optical upper limit
  14. GRB 241017A/sb24101702: Mephisto optical upper limit
  15. GRB 241018A: REM optical/NIR upper limits
  16. GRB 241017A: SVOM/VT follow-up and optical upper limit
  17. GRB 241016B: Fermi GBM Observations
  18. GRB 241018A: Detection of a bright long GRB by SVOM
  19. GRB 241017A: Swift-XRT observations
  20. GRB 241016B: Swift/BAT-GUANO localization skymap of a short burst
  21. Fermi trigger No 750788395: Global MASTER-Net observations report
  22. GRB 241016B: SVOM/GRM observation
  23. GRB241016C: Fermi GBM Final Localization
  24. GRB 241017A : Detection of a weak and soft long duration GRB by SVOM/ECLAIRs
  25. Fermi GRB 241016B: Global MASTER-Net observations report
  26. GRB 241016B: Fermi GBM Final Localization
  27. Fermi GRB 241016A: Global MASTER-Net observations report
  28. GRB 241016A: Fermi GBM Final Real-time Localization
  29. IceCube alert 139977_2910365 retraction
  30. IceCube Alert 241016.04: Global MASTER-Net observations report
  31. GRB 241010A: Swift-BAT refined analysis
  32. GRB 241013B: Fermi GBM Observation
  33. GRB 241013B: Swift/BAT-GUANO localization skymap of a burst
  34. GRB 241013A: Fermi GBM Observation
  35. GRB241013A: REM observations
  36. GRB 241013B: SVOM/GRM observation
  37. Fermi GRB 241013B: Global MASTER-Net observations report
  38. Integral GRB241013.04: Global MASTER-Net observations report
  39. GRB 241013B: Fermi GBM Final Real-time Localization
  40. GRB 241013A: a long GRB detected by INTEGRAL
  41. GRB 241013A: Fermi GBM Final Real-time Localization
  42. LIGO/Virgo/KAGRA S241009em: Updated Sky localization
  43. LIGO/Virgo/KAGRA S241011k: Updated Sky localization
  44. LIGO/Virgo/KAGRA S241011k: NED Galaxies in the Localization Volume
  45. LIGO/Virgo/KAGRA S241011k: Identification of a GW compact binary merger candidate
  46. GRB 241011A: Fermi GBM Final Real-time Localization
  47. LIGO/Virgo/KAGRA S241007bw: Updated Sky localization
  48. Fermi trigger No 750211959: Global MASTER-Net observations report
  49. Swift GRB 241010A: Global MASTER-Net observations report
  50. Fermi trigger No 750291012: Global MASTER-Net observations report
  51. LIGO/Virgo/KAGRA S241009an: Updated Sky localization
  52. Fermi GRB 241010B: Global MASTER-Net observations report
  53. GRB 241010B: Fermi GBM Final Real-time Localization
  54. IceCube-241006A: Upper limits from a search for additional neutrino events in IceCube
  55. GRB 241010A: Swift detection of a burst with an optical counterpart
  56. Fermi-LAT Gamma-ray Observations of IceCube-241006A
  57. GRB 241006A: Swift-BAT refined analysis
  58. LIGO/Virgo/KAGRA S241009l: Updated Sky localization
  59. LIGO/Virgo/KAGRA S241009em: Identification of a GW compact binary merger candidate
  60. GRB 241009A : Detection of a long duration GRB by SVOM/ECLAIRs
  61. GRB 241008A: Fermi GBM Observation
  62. GRB 241008A: Fermi-LAT detection
  63. LIGO/Virgo/KAGRA S241009an: Identification of a GW compact binary merger candidate
  64. LIGO/Virgo/KAGRA S241009l: Identification of a GW compact binary merger candidate
  65. Fermi GRB 241008A: Global MASTER-Net observations report
  66. GRB 241008A: BALROG localization (Fermi Trigger 750117609 / GRB 241008917)
  67. GRB 241008A: Fermi GBM Final Real-time Localization
  68. IceCube-241006A: No candidates from the Zwicky Transient Facility
  69. EP240930a / GRB 240930B: CrAO ZTSH optical upper limit
  70. GRB 241002B: PRIME near-infrared detection in 3rd epoch
  71. Fermi-LAT Gamma-ray Observations of NuEm-240926A
  72. GRB 240910A: LBT optical observations
  73. EP trigger ID 01709065118: KAIT confirmation of the stellar flare
  74. GRB 241006A: SVOM/VT follow-up and optical upper limit
  75. LIGO/Virgo/KAGRA S241007bw: Identification of a GW compact binary merger candidate
  76. IceCube Alert 241006.94: Global MASTER-Net observations report
  77. IceCube-241006A - IceCube observation of a high-energy neutrino candidate track-like event
  78. GRB 241006A: Swift detection of a burst
  79. Swift GRB241006.91: Global MASTER-Net observations report
  80. LIGO/Virgo/KAGRA S241006k: Identification of a GW compact binary merger candidate
  81. LIGO/Virgo/KAGRA S241005bo: Retraction of GW compact binary merger candidate
  82. Fermi trigger No 749721670: Global MASTER-Net observations report
  83. GRB 241004A: SVOM/GRM observation
  84. EP trigger ID 01709065118: the X-ray transient is likely a stellar flare event
  85. GRB 241002B: PRIME near-infrared detection in 2nd epoch
  86. GRB 241002B: Fermi GBM Observation
  87. Fermi trigger No 749735279: Global MASTER-Net observations report
  88. Fermi trigger No 749630753: Global MASTER-Net observations report
  89. Fermi trigger No 749693019: Global MASTER-Net observations report
  90. GRB 241002B: Swift-XRT observations
  91. GRB 241002A: Swift-BAT refined analysis
  92. GRB 241002B: Swift/BAT-GUANO localization skymap of a burst
  93. Konus-Wind detection of GRB 240926A
  94. LIGO/Virgo/KAGRA S240925n: NED Galaxies in the Localization Volume
  95. Fermi-GBM Sub-Threshold Detection of GRB 241002D
  96. IPN triangulation of GRB 240930B / EP 240930a
  97. GRB 241001A : SVOM/VT optical detection
  98. GRB 241002D: SVOM/GRM observation
  99. GRB 241002B: ULL-ASTRO-MASTER LCOGT 0.4m + QHY600 detection of the GOTO optical counterpart candidate AT 2024xbg / GOTO24gpc
  100. GRB 240930B: CALET Gamma-Ray Burst Monitor detection

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