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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"

42588 results found.

  1. GRB 130514A: GROND optical-NIR afterglow discovery and photo-z
  2. GRB 130514A: P60 Observations
  3. GRB 130514A: Swift detection of a burst
  4. GRB 130427A: Tautenburg 2nd epoch: No break, no clear SN
  5. GRB 130513A: a long GRB detected by INTEGRAL
  6. GRB130508A: MASTER-Net optical observations
  7. GRB130511A: SOAO Optical Observation
  8. GRB 130511A: Swift-XRT refined Analysis
  9. GRB 130511A: Kanata/HOWPol optical observation
  10. GRB 130511A, Swift-BAT refined analysis
  11. GRB 130511A: Upper limit by Xinglong TNT optical observation
  12. GRB 130511A: Enhanced Swift-XRT position
  13. GRB 130511A: Gemini-North Redshift
  14. GRB 130511A: Swift detection of a burst with an optical counterpart
  15. GRB 130427A: host galaxy observations
  16. GRB 130508A: RATIR Optical and NIR Observations
  17. GRB 130427A: Keck/LRIS Observations
  18. GRB 130508A: Refined Swift-XRT analysis: Correction to GCN 14612
  19. GRB 130508A, Swift-BAT refined analysis
  20. Fermi Trigger 130507.091 - Detection of a SGR-like Burst
  21. GRB130508A: BOOTES-3 optical limit
  22. GRB 130427A: Ten nights of Skynet/PROMPT/GORT observations
  23. GRB 130508A: Swift detection of a probable burst
  24. GRB 130427A: Continued RATIR Optical and NIR Observations
  25. GRB 130427A, LBT optical spectrum
  26. GRB 130505B: Further Swift observations
  27. GRB 130504C: Swift-XRT afterglow confirmation
  28. GRB 130504C: Suzaku WAM observation of the prompt emission
  29. GRB 130504B: Suzaku WAM observation of the prompt emission
  30. GRB 130505A: Suzaku WAM observation of the prompt emission
  31. GRB 130427A, Watcher afterglow detection
  32. GRB 130427A: Excess optical emission consistent with an emerging supernova
  33. GRB 130427A: Amateur observations from Sweden
  34. GRB 130505A: RATIR Optical and NIR Observations
  35. GRB 130505B: Swift Candidate Afterglow
  36. GRB 130505A: Tautenburg afterglow observations
  37. GRB 130427A: Tautenburg afterglow observations
  38. Refined IPN Triangulation of GRB 130502B
  39. GRB 130427A: RHESSI observations
  40. GRB 130505A, Swift-BAT refined analysis
  41. GRB 130504C: further Swift-XRT observations
  42. Konus-Wind observation of GRB 130504C
  43. GRB 130505B: MAXI/GSC detection
  44. GRB 130505A: optical observations
  45. GRB 130504C: Swift-XRT observations
  46. GRB 130504C: Fermi GBM detection
  47. GRB 130427A: optical observations in CrAO
  48. GRB 130502A: optical upper limit
  49. GRB 130505A: E_iso record retraction
  50. GRB 130427A: correction to GCN 14487
  51. GRB 130505A: correction to GCN 14575
  52. GRB 130505A: Swift-XRT refined Analysis
  53. GRB 130505A: Largest E_iso ever measured
  54. Konus-Wind observation of GRB 130505A
  55. GRB 130504C: Fermi-LAT detection of a burst
  56. Swift/UVOT observations of GRB130505A
  57. GRB 130505A: iTelescope T12 optical observations
  58. GRB 130505A: Xinglong TNT optical observations
  59. GRB 130505A; Weihai optical observations
  60. GRB 130505A: Enhanced Swift-XRT position
  61. GRB 130505A - Gemini-N/GMOS redshift determination
  62. GRB 130505A: MAXI/GSC detection
  63. Konus-Wind observation of GRB 130504B
  64. GRB 130504A: IAC80 optical candidate
  65. GRB 130505A: Swift detection of a burst with optical afterglow
  66. IPN Triangulation of GRB 130504B
  67. GRB 130504B: Fermi GBM detection
  68. GRB 130504A: Bassano Bresciano Observatory optical upper limit
  69. GRB 130504A: Enhanced XRT position
  70. GRB 130502B: Suzaku WAM observation of the prompt emission
  71. GRB 130504A: Swift/UVOT Upper Limits
  72. GRB 130502B: Swift-XRT refined Analysis
  73. GRB 130504A, Swift-BAT refined analysis
  74. Swift-XRT X-ray afterglow candidate for GRB 130504A (BAT trigger 555096)
  75. GRB 130502B: possible TNG counterpart
  76. Trigger 555096: Swift detection of a possible burst
  77. GRB 130502A: Swift-BAT refined analysis
  78. GRB 130427A: Non-observation of VHE emission with HAWC
  79. GRB130502A: MASTER-Net optical observations
  80. GRB 130502A: Swift-XRT refined Analysis
  81. IPN Triangulation of GRB 130502B
  82. GRB 130502A: Fermi GBM detection
  83. GRB 130502B: Swift/UVOT Upper Limits
  84. GRB 130502A: Swift/UVOT Upper Limits
  85. Konus-Wind observation of GRB 130502B
  86. GRB 130502B: P60 Observations
  87. GRB 130502B Swift-XRT observations
  88. GRB 130502A: RATIR Optical and NIR Observations
  89. GRB 130427A: Pan-STARRS 1 optical observations
  90. GRB 130418A: TNG NIR observations
  91. GRB 130502A: Enhanced Swift-XRT position
  92. GRB 130502A: OSN and IAC80 I-band observations
  93. GRB 130502A: z-band observations from GTC
  94. GRB 130502B: Fermi LAT Detection
  95. GRB 130502A: TNG candidate counterpart
  96. GRB 130502B: Fermi GBM detection of a burst
  97. GRB 130502A: T100 Observations
  98. GRB 130502A: Swift detection of a burst
  99. GRB 130427A: Predictions about the occurrence of a supernova
  100. GRB 130427A: KAIT optical observations

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