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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"

15270 results found.

  1. GRB 130925A Swift-BAT refined analysis
  2. GRB 130925A: Initial Similarities to Swift J1644+57
  3. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  4. GRB 130831A: RATIR Confirmation of NIR/Optical Afterglow Flattening
  5. GRB 130903A: optical observations
  6. GRB 130907A: Maidanak optical observations
  7. GRB 130912A: AAO optical upper limit
  8. GRB 130919A: Skynet PROMPT-CTIO optical upper limits
  9. GRB 130903A: Further Swift XRT observations.
  10. Konus-Wind observation of GRB 130912A
  11. GRB 130907A: Continued RATIR Optical and NIR Observations
  12. GRB 130912A: P60 Observations
  13. GRB 130912A: REM optical/NIR upper limits
  14. GRB 130907A: Continued RATIR Optical and NIR Observations
  15. GRB 130907A: RATIR Optical and NIR Observations
  16. GRB 130828A: Further Swift XRT observations
  17. GRB 130907A: INTEGRAL/SPI-ACS light curve
  18. Konus-Wind observation of GRB 130907A
  19. GRB 130907A: VLA detection
  20. GRB 120916A: Fermi-LAT detection of a burst
  21. GRB 130907A: Early Tautenburg detections, red afterglow
  22. GRB 130907A: Skynet DSO-14/Yerkes-41/GORT confirmation of a fading afterglow
  23. GRB 130907A: RATIR Optical and NIR Afterglow Confirmation
  24. GRB 130907A: Skynet DSO-14/Yerkes-41 detections of a possible afterglow
  25. GRB 130831A: Maidanak optical observations
  26. GRB 130822A: nearby galaxy redshifts
  27. GRB 130903A: Fermi GBM observation
  28. GRB 130831A: Continued Skynet/PROMPT-SSO, PROMPT-CTIO and Yerkes-41 detections
  29. GRB 130831B: GROND upper limits
  30. GRB 130831A : Xinglong 60cm optical observation
  31. Konus-Wind observation of GRB 130831A
  32. GRB 130831A: MITSuME Akeno Optical observation
  33. GRB 130831A: Faulkes Telescope North and South optical afterglow
  34. GRB 130829A: NOT optical observations
  35. GRB 130829A: Swift detection of a burst
  36. GRB 130828A Tiled Swift observations
  37. GRB 130828A: Fermi-LAT detection of a burst
  38. IPN triangulation of GRB130821A
  39. Konus-Wind observation of GRB 130821A
  40. GRB 130821A: Fermi-LAT detection of a burst
  41. Konus-Wind observation of GRB 130812B
  42. GRB 130812A: GROND upper limits
  43. Konus-Wind observation of GRB 130804A
  44. GRB 130623A: GROND detection of the optical/NIR afterglow
  45. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  46. GRB130803A: GROND observations
  47. GRB 130804A; Fermi GBM observation
  48. GRB 130803A: RATIR Optical and NIR Observations
  49. GRB 130803A; Fermi GBM observation
  50. Konus-Wind observation of GRB 130727A
  51. GRB 130727A: GROND observations
  52. GRB130725B: REM-ROS2 optical observations
  53. GRB 130702A in the Ep,i - Eiso plane
  54. Konus-Wind observation of GRB 130722A
  55. GRB 130722A: Swift/UVOT Detection
  56. GRB 130722A: MITSuME Okayama upper limits
  57. GRB 130722C Tiled Swift observations
  58. GRB 130722A: Skynet/GORT observations
  59. GRB 130715A: Suzaku WAM observation of the prompt emission
  60. GRB 130716A: Fermi GBM observation
  61. GRB 130716A: Gemini-North imaging
  62. GRB 130626A: Retraction of possible X-ray afterglow
  63. GRB 130708A: Swift XRT and UVOT Observations
  64. GRB 130702A: TNG spectroscopic observations of the emerging supernova
  65. GRB 130708A: Fermi GBM observation
  66. GRB 130708A found in ground analysis of Swift-BAT data
  67. GRB 130702A: Maidanak optical observations
  68. GRB 130628A: Suzaku WAM observation of the prompt emission
  69. GRB130702A: NOT observation - the detection of an emerging supernova
  70. GRB 130702A: Continued UVOT Observations
  71. GRB 130702Ð
  72. Konus-Wind observation of GRB 130702A
  73. GRB130702A: Redshift of Afterglow Candidate iPTF13bxl
  74. GRB 130702A: further TNG observations
  75. GRB 130702A: NOT spectroscopy and redshift of the nearby bright galaxy
  76. GRB 130702A: further Swift-XRT observations
  77. GRB 130702A: NOT optical observations
  78. GRB 130702A: TNG optical observations
  79. GRB 130702A / Fermi394416326 : Nanshan optical observations
  80. IPN localization of GRB 130702A (= Fermi 394416326)
  81. Fermi GRB 130702A: Swift XRT and UVOT observations
  82. GRB 130702A / Fermi394416326: Fermi GBM detection
  83. GRB 130702A / Fermi394416326 : Fermi-LAT detection of a burst
  84. GRB 130628A: Fermi GBM detection
  85. GRB 130627B: Swift afterglow confirmation
  86. GRB 130623A: Second Swift-XRT observation
  87. GRB 130701B: Fermi GBM detection
  88. Konus-Wind observation of GRB 130701A
  89. GRB 130627A: Fermi GBM detection
  90. GRB 130623A: Fermi GBM detection
  91. GRB 130614A: Suzaku WAM observation of the prompt emission
  92. GRB 130609B: Suzaku WAM observation of the prompt emission
  93. GRB 130612A: Continued Skynet/PROMPT/GORT/DSO observations
  94. GRB 130603B: Analogy with GRB 090510A and possible connection with a supernova
  95. GRB 130615A: Continued Skynet/PROMPT Observations
  96. GRB 130614A: Fermi GBM detection
  97. GRB 130615A: GROND afterglow candidate
  98. GRB 130612A: Fermi GBM observation
  99. GRB 130606B: Suzaku WAM observation of the prompt emission
  100. GRB 130612A: MITSuME Okayama upper limits

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