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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"

11633 results found.

  1. GRB 230916B: Glowbug gamma-ray detection
  2. AT 2023sva: NOT observations of the ZTF candidate afterglow
  3. ZTF and SEDM Observations of the Candidate Optical Afterglow AT 2023sva
  4. GRB 230915A: Fermi GBM observation
  5. GRB 230812B: Radio observations with the uGMRT
  6. GRB 230918A: Fermi GBM Final Real-time Localization
  7. GRB 230911A: Fermi GBM Observation
  8. Fermi trigger No 716572242: Global MASTER-Net observations report
  9. Fermi trigger No 716544961: Global MASTER-Net observations report
  10. Fermi-LAT gamma-ray observations of IceCube-230914A
  11. GRB 230915A: Swift/BAT-GUANO detection of a burst
  12. GRB 230911D: GRBAlpha detection
  13. GRB 230906A: optical counterpart
  14. GRB 230911A: Swift-XRT afterglow detection
  15. Fermi trigger No 716449174: Global MASTER-Net observations report
  16. GRB 230913A: CALET Gamma-Ray Burst Monitor detection
  17. Fermi trigger No 716419312: Global MASTER-Net observations report
  18. GRB 230913A: Glowbug gamma-ray detection
  19. GRB 230812B: Bad Time Intervals for Fermi GBM data
  20. IceCube-230914A - IceCube observation of a high-energy neutrino candidate track-like event
  21. GRB 230913A: Fermi GBM Observation
  22. GRB 230911A: Swift ToO observations
  23. GRB 230913A: Swift/BAT-GUANO arcminute localization of a burst
  24. Fermi GRB 230913A: Global MASTER-Net observations report
  25. GRB 230911A: GOTO optical counterpart candidate
  26. GRB 230913A: Fermi GBM Final Real-time Localization
  27. GRB 230911D: NuSTAR Detection of Prompt Emission
  28. GRB 230911B: AstroSat CZTI detection
  29. GRB 230906A: Chandra detection of the X-ray afterglow
  30. GRB 230911D: Fermi GBM observation
  31. IPN triangulation of GRB 230911D (long)
  32. GRB 230911D: Fermi-LAT detection
  33. GRB 230911B: GRBAlpha and VZLUSAT-2 joint detection
  34. Fermi trigger No 716145795: Global MASTER-Net observations report
  35. Konus-Wind detection of GRB 230811D
  36. GRB 230911D: BALROG localization (Fermi Trigger 716111594/ GRB 230911329)
  37. GRB 230911D: Fermi GBM Final Localization
  38. Fermi GRB 230911B: Global MASTER-Net observations report
  39. GRB 230911B: Fermi GBM Final Real-time Localization
  40. GRB 230911A: Fermi GBM Final Real-time Localization
  41. GRB 230906A: BlackGEM upper limits
  42. GRB 230903A: TESS observations of optical emission
  43. GRB 230906A: AstroSat CZTI detection
  44. GRB 230910A: Fermi GBM Final Real-time Localization
  45. GRID detection of GRB 230827A
  46. GRB 230818A: radio observation with the VLA
  47. Konus-Wind detection of GRB 230906A (short)
  48. IPN triangulation of GRB 230906A (short)
  49. Fermi GRB 230906A: Global MASTER-Net observations report
  50. GRB 230906A: Fermi GBM Final Localizationn
  51. GRB 230905A: Fermi GBM Final Real-time Localization
  52. GRB 230903A: VLT/X-shooter optical observations
  53. GRB 230904C: Fermi GBM Final Localization
  54. Fermi trigger No 715552087: Global MASTER-Net observations report
  55. Fermi trigger No 715429986: Global MASTER-Net observations report
  56. Fermi GRB 230903A: Global MASTER-Net observations report
  57. GRB 230903A: Fermi GBM detection
  58. GRB 230904B is not a GRB
  59. GRB 230904B: BALROG localization (Fermi Trigger 715526984 / GRB 230904562)
  60. Fermi GRB 230904A: Global MASTER-Net observations report
  61. GRB 230904A: Fermi GBM Final Real-time Localization
  62. GRB 230903A: Fermi GBM Final Real-time Localization
  63. GRB 230827B: Glowbug gamma-ray detection
  64. GRB 230827A: Glowbug gamma-ray detection
  65. GRB 230826A: Glowbug gamma-ray detection
  66. GRB 230827B: Swift-XRT afterglow detection
  67. GRB 230812B: Spectroscopic detection of the associated SN 2023pel.
  68. GRB 230827B: Swift ToO observations
  69. GRB 230827A: Fermi GBM Observation
  70. GRB 230827B: CALET Gamma-Ray Burst Monitor detection
  71. GRB 230827A: VZLUSAT-2 detection
  72. GRB 230827A: Swift/BAT-GUANO detection of a burst outside the coded FOV
  73. GRB 230826A: VZLUSAT-2 detection
  74. GRB 230827B: VZLUSAT-2 detection
  75. GRB 230827B / GRB 230827256: Fermi GBM Observation
  76. GRB 230827A: GRBAlpha detection
  77. GRB 230827A: BALROG localization (Fermi Trigger / GRB 230827762)
  78. Fermi trigger No 714809315: Global MASTER-Net observations report
  79. GRB 230827.256: AKO Optical follow-up of ZTF23abaanxz (AT 2023qxj)
  80. Fermi GRB 230827A: Global MASTER-Net observations report
  81. GRB 230827.256 : GIT optical follow-up of ZTF23abaanxz/AT2023qxj
  82. GRB 230827A: Fermi GBM Final Real-time Localization
  83. AT 2023qxj: ZTF discovery of the likely afterglow of Fermi GRB 230827256
  84. GRB 230826A: GRBAlpha detection
  85. GRB 230826A: Fermi GBM Observation
  86. GRB 230826A: Mondy optical observations
  87. GRB 230826A: Swift detection of a burst
  88. GRB 230826A: Fermi GBM Final Real-time Localization
  89. GRB 230812B: radio detection with the VLA
  90. Fermi Gamma-ray Burst Monitor trigger 714618399/230825046 is not a GRB
  91. Fermi trigger No 714618399: Global MASTER-Net observations report
  92. GRB 230822A: Fermi GBM Observation
  93. GRB 230822A: Swift/BAT-GUANO detection of a burst
  94. IceCube-230823A - IceCube observation of a high-energy neutrino candidate track-like event
  95. GRID detection of GRB 230818A
  96. GRB 230822A: Fermi GBM Final Real-time Localization
  97. GRB 230812B: Assy optical observations, possible SN rise
  98. GRB 230812B: SAO RAS RC-500 and Zeiss-1000 observations
  99. GRB 20230818A: GIT optical upper limit
  100. Konus-Wind detection of GRB 230818A

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