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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"

27036 results found.

  1. GRB 130513A: GROND observations
  2. GRB 130514A: Swift-BAT refined analysis
  3. GRB 130513A: Swift-XRT detection of the afterglow.
  4. GRB 130514A: GROND optical-NIR afterglow discovery and photo-z
  5. GRB 130514A: P60 Observations
  6. GRB 130514A: Swift detection of a burst
  7. GRB 130511A: Swift-XRT refined Analysis
  8. GRB 130511A: Kanata/HOWPol optical observation
  9. GRB 130511A, Swift-BAT refined analysis
  10. GRB 130511A: Upper limit by Xinglong TNT optical observation
  11. GRB 130511A: Gemini-North Redshift
  12. GRB 130511A: Swift detection of a burst with an optical counterpart
  13. GRB 130508A: Swift/UVOT Upper Limits
  14. GRB 130508A: RATIR Optical and NIR Observations
  15. GRB 130508A: Refined Swift-XRT analysis: Correction to GCN 14612
  16. GRB 130508A, Swift-BAT refined analysis
  17. Fermi Trigger 130507.091 - Detection of a SGR-like Burst
  18. GRB 130427A: Ten nights of Skynet/PROMPT/GORT observations
  19. GRB 130508A: Swift detection of a probable burst
  20. GRB 130505B: Further Swift observations
  21. GRB 130504C: Swift-XRT afterglow confirmation
  22. GRB 130505A: MITSuME Akeno Optical observation
  23. GRB 130504C: Suzaku WAM observation of the prompt emission
  24. GRB 130504B: Suzaku WAM observation of the prompt emission
  25. GRB 130505A: Suzaku WAM observation of the prompt emission
  26. GRB 130427A, Watcher afterglow detection
  27. GRB 130427A: Excess optical emission consistent with an emerging supernova
  28. GRB 130505A: RATIR Optical and NIR Observations
  29. GRB 130505B: Swift Candidate Afterglow
  30. GRB 130505A, Swift-BAT refined analysis
  31. GRB 130504C: further Swift-XRT observations
  32. GRB 130504C: Swift-XRT observations
  33. GRB 130504C: Fermi GBM detection
  34. GRB 130502A: optical upper limit
  35. GRB 130505A: Swift-XRT refined Analysis
  36. Konus-Wind observation of GRB 130505A
  37. GRB 130504C: Fermi-LAT detection of a burst
  38. Swift/UVOT observations of GRB130505A
  39. GRB 130505A: Xinglong TNT optical observations
  40. GRB 130505A; Weihai optical observations
  41. GRB 130505A - Gemini-N/GMOS redshift determination
  42. GRB 130505A: MAXI/GSC detection
  43. GRB 130504A: IAC80 optical candidate
  44. GRB 130505A: Swift detection of a burst with optical afterglow
  45. GRB 130504B: Fermi GBM detection
  46. GRB 130504A: Bassano Bresciano Observatory optical upper limit
  47. GRB 130502B: Suzaku WAM observation of the prompt emission
  48. GRB 130504A: Swift/UVOT Upper Limits
  49. GRB 130502B: Swift-XRT refined Analysis
  50. GRB 130504A, Swift-BAT refined analysis
  51. Swift-XRT X-ray afterglow candidate for GRB 130504A (BAT trigger 555096)
  52. GRB 130502B: possible TNG counterpart
  53. Trigger 555096: Swift detection of a possible burst
  54. GRB 130502A: Swift-BAT refined analysis
  55. GRB 130427A: Non-observation of VHE emission with HAWC
  56. GRB 130502A: Swift-XRT refined Analysis
  57. GRB 130502A: Fermi GBM detection
  58. GRB 130502B: Swift/UVOT Upper Limits
  59. GRB 130502A: Swift/UVOT Upper Limits
  60. GRB 130502B: P60 Observations
  61. GRB 130502B Swift-XRT observations
  62. GRB 130502A: RATIR Optical and NIR Observations
  63. GRB 130502B: Fermi LAT Detection
  64. GRB 130502A: TNG candidate counterpart
  65. GRB 130502B: Fermi GBM detection of a burst
  66. GRB 130502A: T100 Observations
  67. GRB 130502A: Swift detection of a burst
  68. GRB 130427A: Predictions about the occurrence of a supernova
  69. GRB 130427A: KAIT optical observations
  70. GRB 130425A: Suzaku WAM observation of the prompt emission
  71. GRB 130427A: High-energy neutrino search
  72. GRB 130427A: Continued RATIR Optical and NIR Observations
  73. Swift-BAT trigger 554135 is noise
  74. GRB 130427A: Challis Observatory optical observations
  75. GRB 130427A: Continued Skynet/PROMPT Observations
  76. GRB 130427A: further GMG observations
  77. GRB 130427A: Fermi-LAT refined analysis
  78. GRB 130427A: Continued RATIR Optical and NIR Observations
  79. GRB 130427A: CrAO RT-22 36 GHz observation
  80. GRB 130418A: Bassano Bresciano Observatory lightcurve analisis
  81. GRB 130427A: Improved Swift-XRT analysis
  82. GRB 130425: MASTER-Net optical observations
  83. GRB 100728A: GROND host detection and X-shooter redshift
  84. GRB 130427A: Skynet/PROMPT Observations
  85. GRB 130427B: RATIR Optical and NIR Observations
  86. GRB 130427A : Xinglong TNT optical observation
  87. GRB 130427A optical time series
  88. Konus-Wind observation of GRB 130427A
  89. GRB 130427A: Kanata/HOWPol optical imaging polarimetry
  90. GRB 130427A: Swift-XRT refined Analysis
  91. GRB 130427A: Continued RATIR Optical and NIR Observations
  92. GRB 130427B: Swift-XRT refined Analysis
  93. GRB 130427A: NOT optical photometry and redshift
  94. GRB 130427A: RAPTOR Bright Counterpart Before Swift Trigger
  95. GRB 130427A: T100 observations
  96. GRB 130427A: Fermi GBM observation
  97. GRB 130427A: Fermi-LAT detection of a burst
  98. GRB 130427A: Swift-BAT refined analysis
  99. GRB 130427B: Swift-BAT refined analysis
  100. GRB 130427A: Zadko observatory - Gingin optical observations

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