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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"

11610 results found.

  1. Fermi GRB 230913A: Global MASTER-Net observations report
  2. GRB 230911A: GOTO optical counterpart candidate
  3. GRB 230913A: Fermi GBM Final Real-time Localization
  4. GRB 230911D: NuSTAR Detection of Prompt Emission
  5. GRB 230911B: AstroSat CZTI detection
  6. GRB 230906A: Chandra detection of the X-ray afterglow
  7. GRB 230911D: Fermi GBM observation
  8. IPN triangulation of GRB 230911D (long)
  9. GRB 230911D: Fermi-LAT detection
  10. GRB 230911B: GRBAlpha and VZLUSAT-2 joint detection
  11. Fermi trigger No 716145795: Global MASTER-Net observations report
  12. Konus-Wind detection of GRB 230811D
  13. GRB 230911D: BALROG localization (Fermi Trigger 716111594/ GRB 230911329)
  14. GRB 230911D: Fermi GBM Final Localization
  15. Fermi GRB 230911B: Global MASTER-Net observations report
  16. GRB 230911B: Fermi GBM Final Real-time Localization
  17. GRB 230911A: Fermi GBM Final Real-time Localization
  18. GRB 230906A: BlackGEM upper limits
  19. GRB 230903A: TESS observations of optical emission
  20. GRB 230906A: AstroSat CZTI detection
  21. GRB 230910A: Fermi GBM Final Real-time Localization
  22. GRID detection of GRB 230827A
  23. GRB 230818A: radio observation with the VLA
  24. Konus-Wind detection of GRB 230906A (short)
  25. IPN triangulation of GRB 230906A (short)
  26. Fermi GRB 230906A: Global MASTER-Net observations report
  27. GRB 230906A: Fermi GBM Final Localizationn
  28. GRB 230905A: Fermi GBM Final Real-time Localization
  29. GRB 230903A: VLT/X-shooter optical observations
  30. GRB 230904C: Fermi GBM Final Localization
  31. Fermi trigger No 715552087: Global MASTER-Net observations report
  32. Fermi trigger No 715429986: Global MASTER-Net observations report
  33. Fermi GRB 230903A: Global MASTER-Net observations report
  34. GRB 230903A: Fermi GBM detection
  35. GRB 230904B is not a GRB
  36. GRB 230904B: BALROG localization (Fermi Trigger 715526984 / GRB 230904562)
  37. Fermi GRB 230904A: Global MASTER-Net observations report
  38. GRB 230904A: Fermi GBM Final Real-time Localization
  39. GRB 230903A: Fermi GBM Final Real-time Localization
  40. GRB 230827B: Glowbug gamma-ray detection
  41. GRB 230827A: Glowbug gamma-ray detection
  42. GRB 230826A: Glowbug gamma-ray detection
  43. GRB 230827B: Swift-XRT afterglow detection
  44. GRB 230812B: Spectroscopic detection of the associated SN 2023pel.
  45. GRB 230827B: Swift ToO observations
  46. GRB 230827A: Fermi GBM Observation
  47. GRB 230827B: CALET Gamma-Ray Burst Monitor detection
  48. GRB 230827A: VZLUSAT-2 detection
  49. GRB 230827A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  50. GRB 230826A: VZLUSAT-2 detection
  51. GRB 230827B: VZLUSAT-2 detection
  52. GRB 230827B / GRB 230827256: Fermi GBM Observation
  53. GRB 230827A: GRBAlpha detection
  54. GRB 230827A: BALROG localization (Fermi Trigger / GRB 230827762)
  55. Fermi trigger No 714809315: Global MASTER-Net observations report
  56. GRB 230827.256: AKO Optical follow-up of ZTF23abaanxz (AT 2023qxj)
  57. Fermi GRB 230827A: Global MASTER-Net observations report
  58. GRB 230827.256 : GIT optical follow-up of ZTF23abaanxz/AT2023qxj
  59. GRB 230827A: Fermi GBM Final Real-time Localization
  60. AT 2023qxj: ZTF discovery of the likely afterglow of Fermi GRB 230827256
  61. GRB 230826A: GRBAlpha detection
  62. GRB 230826A: Fermi GBM Observation
  63. GRB 230826A: Mondy optical observations
  64. GRB 230826A: Swift detection of a burst
  65. GRB 230826A: Fermi GBM Final Real-time Localization
  66. GRB 230812B: radio detection with the VLA
  67. Fermi Gamma-ray Burst Monitor trigger 714618399/230825046 is not a GRB
  68. Fermi trigger No 714618399: Global MASTER-Net observations report
  69. GRB 230822A: Fermi GBM Observation
  70. GRB 230822A: Swift/BAT-GUANO detection of a burst
  71. IceCube-230823A - IceCube observation of a high-energy neutrino candidate track-like event
  72. GRID detection of GRB 230818A
  73. GRB 230822A: Fermi GBM Final Real-time Localization
  74. GRB 230812B: Assy optical observations, possible SN rise
  75. GRB 230812B: SAO RAS RC-500 and Zeiss-1000 observations
  76. GRB 20230818A: GIT optical upper limit
  77. Konus-Wind detection of GRB 230818A
  78. GRB 230812B : GRANDMA/Kilonova-Catcher optical afterglow detection and upper limits
  79. GRB 230818A: Fermi GBM Observation
  80. GRB 230812B: GIT Confirmation of SN rise
  81. GRB 230818A: Nickel and KAIT telescope optical observations
  82. GRB 230818A: SAO RAS 6-m telescope spectroscopy
  83. GRB 230812B: SAO RAS Zeiss-1000 observations
  84. GRB 230818A: further SAO RAS Zeiss-1000 observations
  85. GRB 230818A: AKO Upper Limit
  86. GRB 230818A: AstroSat CZTI detection
  87. GRB 230818A: Tautenburg observations
  88. GRB 230818A: Leavitt Observatory upper limit
  89. GRB 230818A: Bassano Bresciano Observatory optical observations
  90. GRB 230818A: KGO RC-25 optical observations
  91. GRB 230818A: NOT photometry and spectroscopy
  92. GRB 230818A: SAO RAS Zeiss-1000 observations
  93. Fermi GRB 230818A: Global MASTER-Net observations report
  94. Fermi trigger No 713974668: Global MASTER-Net observations report
  95. GRB 230818A: GOTO optical afterglow detection
  96. GRB 230818A: Fermi GBM Final Real-time Localization
  97. GRB 230812B: SAO RAS observations, possible re-brightening
  98. GRB 230817A: AstroSat CZTI detection
  99. GRB 230812B: SAO RAS optical observations
  100. Fermi GRB 230817A: Global MASTER-Net observations report

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