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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"

11634 results found.

  1. GRB241013A: REM observations
  2. GRB 241013B: SVOM/GRM observation
  3. Fermi GRB 241013B: Global MASTER-Net observations report
  4. GRB 241013B: Fermi GBM Final Real-time Localization
  5. GRB 241013A: a long GRB detected by INTEGRAL
  6. GRB 241013A: Fermi GBM Final Real-time Localization
  7. Fermi Gamma-ray Burst Monitor GRB trigger 750372658/241011869 (GRB 241011A) is not a GRB
  8. GRB 241011A: Fermi GBM Final Real-time Localization
  9. Fermi trigger No 750211959: Global MASTER-Net observations report
  10. Fermi Gamma-ray Burst Monitor trigger 750303285/241011066 is not a GRB
  11. Fermi Gamma-ray Burst Monitor trigger 750291012/241010924 is not a GRB
  12. Fermi trigger No 750291012: Global MASTER-Net observations report
  13. Fermi GRB 241010B: Global MASTER-Net observations report
  14. GRB 241010B: Fermi GBM Final Real-time Localization
  15. Fermi-LAT Gamma-ray Observations of IceCube-241006A
  16. GRB 241008A: Fermi GBM Observation
  17. GRB 241008A: Fermi-LAT detection
  18. GRB 241002B: Swift-XRT afterglow detection
  19. Fermi GRB 241008A: Global MASTER-Net observations report
  20. GRB 241008A: BALROG localization (Fermi Trigger 750117609 / GRB 241008917)
  21. GRB 241008A: Fermi GBM Final Real-time Localization
  22. GRB 241002B: PRIME near-infrared detection in 3rd epoch
  23. Fermi-LAT Gamma-ray Observations of NuEm-240926A
  24. GRB 240821A: Host galaxy redshift from VLT/X-shooter
  25. IceCube-241006A - IceCube observation of a high-energy neutrino candidate track-like event
  26. GRB 240930B: SVOM/C-GFT optical upper limit
  27. Fermi trigger No 749721670: Global MASTER-Net observations report
  28. GRB 240930B / EP 240930a: SVOM/GRM observation
  29. GRB 241002B: PRIME near-infrared detection in 2nd epoch
  30. GRB 241002B: Fermi GBM Observation
  31. Fermi trigger No 749735279: Global MASTER-Net observations report
  32. Fermi trigger No 749630753: Global MASTER-Net observations report
  33. Fermi trigger No 749693019: Global MASTER-Net observations report
  34. GRB 241002B: Swift-XRT observations
  35. GRB 241002B: Swift/BAT-GUANO localization skymap of a burst
  36. GRB 241002B: Swift ToO observations
  37. GRB 241002B: PRIME near-infrared detection
  38. Fermi-GBM Sub-Threshold Detection of GRB 241002D
  39. IPN triangulation of GRB 240930B / EP 240930a
  40. GRB 241002B: GOTO24gpc/AT 2024xbg follow-up observations update
  41. GRB 241002B: ULL-ASTRO-MASTER LCOGT 0.4m + QHY600 detection of the GOTO optical counterpart candidate AT 2024xbg / GOTO24gpc
  42. GRB 240930B: CALET Gamma-Ray Burst Monitor detection
  43. GRB 240929A: SAO RAS, Mondy, and CrAO optical observations
  44. EP240930a: Liverpool Telescope observations
  45. GRB 241002B: GOTO optical counterpart candidate
  46. GRB 240929A: Liverpool Telescope prompt followup observations
  47. Fermi GRB 241002B: Global MASTER-Net observations report
  48. GRB 241002B: Fermi GBM Final Real-time Localization
  49. GRB 240930B: Fermi GBM Observation
  50. GRB 240930B: GRBAlpha detection
  51. GRB 240929A: GRBAlpha detection
  52. GRB 240930B: Swift/BAT-GUANO localization skymap of a burst
  53. EP240930a: EP-FXT follow-up observation update
  54. Fermi-LAT Gamma-ray Observations of IceCube-240929A
  55. EP240930a: GOTO optical upper limits
  56. GRB 240929A: SVOM/GRM observation
  57. EP240930a: EP-WXT detection of a fast X-ray transient
  58. GRB 240929A : Leavitt Observatory optical upper limit
  59. Fermi GRB 240930B: Global MASTER-Net observations report
  60. GRB 240930B: Fermi GBM Final Real-time Localization
  61. GRB 240825A: LBT optical observations
  62. Fermi GRB 240930A: Global MASTER-Net observations report
  63. Fermi Gamma-ray Burst Monitor trigger 749362078/240930172 (GRB 240930A) is not a GRB
  64. GRB 240930A: Fermi GBM Final Real-time Localization
  65. Fermi trigger No 749339671: Global MASTER-Net observations report
  66. Fermi Gamma-ray Burst Monitor trigger 749339671/240929913 is not a GRB
  67. GRB 240929A long GRB detected by INTEGRAL
  68. GRB 240929A: BALROG localization (Fermi Trigger 749332209 / GRB 240929826)
  69. Fermi GRB 240929A: Global MASTER-Net observations report
  70. GRB 240929A: Fermi GBM Final Real-time Localization
  71. IceCube-240929A - IceCube observation of a high-energy neutrino candidate track-like event
  72. Konus-Wind detection of GRB 240912A
  73. Fermi Gamma-ray Burst Monitor trigger 749191601/240928199 is not a GRB
  74. Konus-Wind detection of GRB 240905B
  75. Insight-HXMT ToO observations of X-ray bursts from SGR 1E 1841-045 / Kes 73
  76. Konus-Wind detection of GRB 240918B
  77. IPN triangulation of GRB 240918B
  78. GRB 240905B: VZLUSAT-2 detection
  79. GRB 240918B: AstroSat CZTI detection
  80. Fermi GBM Sub-Threshold Detection of GRB240919A / EP240919a
  81. GRB 240414A: further radio observations with the VLA
  82. GRB 240919A / EP240919a: SVOM/GRM observation
  83. EP240919a: INTEGRAL SPI-ACS confirmation of reported high-energy counterpart
  84. EP240919a: INTEGRAL SPI-ACS confirmation of reported high-energy counterpart
  85. GRB 240910A: radio detection with the VLA
  86. EP240919a: JinShan optical upper limits
  87. EP240919a is likely a GRB event
  88. GRB 240918A and GRB 240918B : INTEGRAL SPI ACS LIGHT CURVE
  89. GRB 240918B: Fermi GBM Detection
  90. Fermi GRB 240918A: Global MASTER-Net observations report
  91. GRB 240918A: Fermi GBM Final Real-time Localization
  92. GRB 240916A: GRBAlpha detection
  93. GRB 240914B: GRBAlpha detection
  94. GRB 240916A: NOT optical observation
  95. IPN triangulation of GRB 240913C / EP 240913a
  96. GRB 240825A: INTEGRAL SPI ACS LIGHT CURVE
  97. GRB 240916A: Fermi GBM Observation
  98. GRB 240821A: radio observation with the VLA
  99. GRB 240916A (AT 2024vlp / GOTO24fzn): VLT/X-shooter redshift
  100. GRB 240916A: Swift-XRT afterglow detection

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