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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

43604 results found.

  1. GRB 130812A: Swift-XRT refined Analysis
  2. GRB 130812A: Enhanced Swift-XRT position
  3. GRB 130812A: Swift detection of a burst
  4. GRB130807A: Swift/UVOT observations
  5. GRB 130807A: Swift-XRT refined analysis
  6. GRB 130807A, Swift-BAT refined analysis
  7. GRB 130807A: Swift detection of a GRB or Galactic transient
  8. Konus-Wind observation of GRB 130804A
  9. GRB 130623A: GROND detection of the optical/NIR afterglow
  10. GRB 130806A: Swift-XRT refined Analysis
  11. GRB 130806A, Swift-BAT refined analysis
  12. IPN localization of GRB 130804A
  13. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  14. GRB130803A: GROND observations
  15. GRB 130806A: Enhanced Swift-XRT position
  16. GRB 130806A: Swift detection of a burst
  17. GRB 130804A; Fermi GBM observation
  18. Trigger 565443: Swift detection of a burst from SGR J1745-29
  19. GRB 130803A: Swift-XRT refined Analysis
  20. GRB 130803A: RATIR Optical and NIR Observations
  21. GRB130803A: GROND detection of possible host
  22. GRB 130803A; Fermi GBM observation
  23. GRB 130803A, Swift-BAT refined analysis
  24. GRB 130803A: Enhanced Swift-XRT position
  25. GRB 130803A: Faulkes Telescope South Observations
  26. GRB 130803A: Swift detection of a burst
  27. GRB 130727A: Watcher optical limit
  28. GRB 130722A: RATIR Optical Observations
  29. GRB 130727A: Swift/UVOT Detection
  30. Konus-Wind observation of GRB 130727A
  31. GRB 130727A: Swift-XRT refined Analysis
  32. GRB 130727A: Fermi GBM detection
  33. GRB 130727A: GROND observations
  34. GRB 130727A: Enhanced Swift-XRT position
  35. GRB 130727A: Faulkes Telescope South optical afterglow
  36. GRB 130727A: Swift-BAT refined analysis
  37. GRB 130727A: Swift-XRT observations
  38. GRB 130727A: Swift-XRT and Swift-UVOT prompt observations
  39. GRB 130727A: Swift detection of a burst
  40. GRB 130725B: Swift/UVOT Observations
  41. GRB 130725B: Swift trigger time correction
  42. Fermi Gamma-ray Burst Monitor trigger 396484884 / 130725945 is not a GRB
  43. GRB 130725A: Swift-XRT refined Analysis
  44. GRB 130725B, Swift-BAT refined analysis
  45. GRB 130725B: Swift-XRT refined Analysis
  46. GRB 130725B - UVOT-enhanced XRT position
  47. Fermi Gamma-ray Burst Monitor trigger 396533554 / 130726509 is not a GRB
  48. GRB 130725A - Faulkes Telescope South Observations
  49. GRB 130725B: GROND Detection of the Optical/NIR Afterglow
  50. GRB 130725B: Swift/UVOT Detection of an Optical Counterpart
  51. GRB 130725A, Swift-BAT refined analysis
  52. GRB 130719A: Skynet/PROMPT observations
  53. GRB 130725B: Swift detection of a burst
  54. Swift Trigger 563980 is GRB 130725A
  55. Fermi Gamma-ray Burst Monitor trigger 396447899 / 130725517 is not a GRB
  56. GRB 130702A in the Ep,i - Eiso plane
  57. Retraction of GCN Circ. 15020 (GRB 130722C Tiled Swift observations)
  58. Konus-Wind observation of GRB 130722A
  59. GRB 130722A: Swift/UVOT Detection
  60. GRB 130722C Tiled Swift observations
  61. GRB 130722A: Enhanced Swift-XRT position
  62. GRB 130722A: Swift-XRT refined Analysis
  63. GRB 130722A: Skynet/GORT observations
  64. GRB 130719A, Swift-BAT refined analysis
  65. GRB 130722A: Faulkes Telescope South optical candidate
  66. GRB 130715A: Suzaku WAM observation of the prompt emission
  67. GRB 130722A: Swift detection of a burst
  68. GRB 130719A: Swift detection of a burst
  69. GRB 130716A: Fermi GBM observation
  70. GRB 130702A : Xinglong TNT continue optical observation
  71. GRB 130716A: Gemini-North imaging
  72. GRB 130716A: Probable short-hard burst with delayed Swift data
  73. GRB 130715A: Fermi GBM detection
  74. GRB 130626A: Retraction of possible X-ray afterglow
  75. GRB 130702A: Maidanak optical observations
  76. GRB 130708A: Swift XRT and UVOT Observations
  77. GRB 130702A: TNG spectroscopic observations of the emerging supernova
  78. GRB 130708A: Fermi GBM observation
  79. GRB 130702A: P200 Spectroscopic Confirmation of Associated Supernova
  80. GRB 130708A found in ground analysis of Swift-BAT data
  81. GRB 130702A: Maidanak optical observations
  82. GRB 130628A: Suzaku WAM observation of the prompt emission
  83. GRB130702A: NOT observation - the detection of an emerging supernova
  84. GRB 130702A: Continued RATIR Optical and NIR Observations
  85. GRB 130702A: Xinglong TNT optical observation
  86. GRB 130702A: VLA detection
  87. GRB 130702A (= Fermi 394416326): correction of the GCN #14988 title
  88. GRB 130702Ð
  89. GRB 130702A: WSRT radio detection
  90. Konus-Wind observation of GRB 130702A
  91. GRB130702A: Redshift of Afterglow Candidate iPTF13bxl
  92. GRB 130702A: further TNG observations
  93. GRB 130702A: NOT spectroscopy and redshift of the nearby bright galaxy
  94. GRB 130702A: further Swift-XRT observations
  95. GRB 130702A: Continued P60 observations
  96. GRB 130702A: RATIR Optical and NIR Observations
  97. GRB 130702A: CARMA 3mm detection
  98. GRB 130702A: NOT optical observations
  99. GRB 130702A: TNG optical observations
  100. GRB 130702A / Fermi394416326 : Nanshan optical observations

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