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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"

45804 results found.

  1. GRB 140614A: Swift detection of a burst
  2. GRB 140611A: Swift-XRT observations
  3. Konus-Wind observation of GRB 140611A
  4. GRB 140610A: Swift-XRT refined Analysis
  5. GRB 140606B / iPTF 14bfu: MOSFIRE NIR imaging
  6. GRB 140611A Detection of a source in BAT ground analysis
  7. GRB 140610A: Fermi GBM Detection
  8. IPN Triangulation of GRB 140611A (short/hard)
  9. GRB 140610A: RATIR Optical and NIR Observations
  10. GRB 140610A: Swift-BAT refined analysis
  11. GRB 140610A: MASTER optical observations
  12. GRB 140610A: Swift/UVOT Upper Limits
  13. Konus-Wind observation of GRB 140610A
  14. Swift/XRT returns to normal observing
  15. GRB140606B: DCT time of observation correction
  16. GRB 140610A: Swift-XRT observations
  17. GRB 140610A: Swift detection of a burst
  18. Konus-Wind observation of GRB 140606B
  19. GRB 140606B: Swift XRT refined analysis
  20. GRB 140521A: AAO optical upper limit
  21. GRB 140606A: AAO optical upper limit
  22. GRB 140607A: Swift-BAT refined analysis
  23. IPN Triangulation of GRB 140606B
  24. GRB 140606B: Swift/UVOT Upper Limits
  25. GRB140606B/iPTF14bfu: Discovery Channel Telescope Optical Detection
  26. GRB 140606B: Swift XRT position
  27. GRB 140606B / Fermi 432717114 / iPTF 14bfu: Keck redshift
  28. GRB 140607A: Swift detection of a burst
  29. GRB 140606B: Fermi GBM detection
  30. Fermi 423717114: Additional P48 and P60 observations
  31. GRB 140606A: BOOTES-2 optical upper limit
  32. Fermi423717114: iPTF optical transient candidates
  33. GRB 140606A: Nanshan optical upper limit
  34. GRB 140606A: Swift/UVOT Upper Limits
  35. GRB 140606A: Swift-XRT upper limits
  36. Swift XRT status update
  37. GRB 140606A: Swift-BAT refined analysis
  38. GRB 140606A: Swift detection of a short hard burst
  39. Swift Trigger 600914 is probably a noise fluctuation
  40. Konus-Wind observation of GRB 140604A
  41. IPN Triangulation of GRB 140604A (short/hard)
  42. Swift XRT is off-line
  43. GRB 140523A: further Swift-XRT observations
  44. GRB 140528A: Fermi GBM Detection
  45. GRB 140529A BAT refined analysis
  46. Konus-Wind observation of GRB 140529A
  47. Konus-Wind observation of GRB 140528A
  48. GRB 140529A: Swift/UVOT Upper Limits
  49. GRB 140529A: Swift-XRT afterglow detection.
  50. GRB 140408A: Withdrawal of afterglow candidate
  51. GRB 140529A found in ground analysis of BAT slew data
  52. IPN Triangulation of GRB 140528A
  53. Chandra late-time observations of GRB140515A
  54. Swift Trigger 600114 in M31: UVOT Observations
  55. Swift trigger 600114 is not an outbursting X-ray source
  56. Swift Trigger 600114: Optical spectroscopy from GTC
  57. Swift Trigger 600114: Preliminary BAT analysis
  58. Swift Trigger 600114 in M31: Archival and Prompt UVOT Imaging
  59. Swift detection of a bright X-ray source in M31
  60. Fermi GBM trigger 422752719/ 140525971 is not a GRB
  61. Swift detection of SFXT IGR J17544-2619
  62. GRB 140523A: NOT observation
  63. Konus-Wind observation of GRB 140523A
  64. IPN Triangulation of GRB 140523A
  65. GRB 140523A: Nanshan optical upper limit
  66. Swift trigger 599860 probably not real
  67. GRB 140523A: possible X-ray afterglow candidate from tiled Swift/XRT observations
  68. GRB 140523A Tiled Swift observations
  69. GRB 140523A: Fermi-LAT detection
  70. GRB 140523A: Fermi GBM detection
  71. GRB 140521A : Xinglong TNT upper limit
  72. GRB 140521A: Fermi GBM Detection
  73. GRB 140423A: TShAO optical observations
  74. GRB 140521A: AAO optical observations
  75. GRB 140521A: Swift-BAT refined analysis
  76. GRB 140521A: AROMA-N Optical Observation
  77. GRB 140521A: MITSuME Okayama upper limits
  78. GRB 140516A: further Swift-XRT analysis
  79. GRB 140521A: MASTER optical observations
  80. GRB 140521A: Swift detection of a burst
  81. GRB 140512A: Redshift from NOT
  82. GRB 140518A: T100 observations
  83. GRB 140518A: Continued RATIR Optical and NIR Observations
  84. GRB 140512A: MASTER prompt and afterglow optical observations
  85. GRB 140518A, Swift-BAT refined analysis
  86. GRB 140518A: Swift-XRT refined Analysis
  87. GRB 140518A: Skynet GORT Detections of the Optical Afterglow
  88. GRB 140518A: Swift/UVOT Upper Limits
  89. GRB 140518A: RATIR Optical and NIR Observations
  90. GRB 140518A: Gemini-N redshift
  91. GRB 140518A: P60 i-/z-band detections
  92. GRB 140518A: KAIT optical candidate
  93. GRB 140518A: Swift detection of a burst
  94. GRB 140516A: RATIR Optical and NIR Observations
  95. GRB 140516A: Subaru NIR imaging observations
  96. GRB 140516A: 6 GHz upper limit
  97. GRB 140516A: Gemini-North limit on an optical afterglow
  98. GRB 140516A: Swift/UVOT Upper Limits
  99. GRB 140516A: Swift-BAT refined analysis
  100. GRB 140516A: Swift-XRT refined Analysis

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