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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"

19662 results found.

  1. GRB 130504C: Swift-XRT afterglow confirmation
  2. GRB 130504C: Suzaku WAM observation of the prompt emission
  3. GRB 130504B: Suzaku WAM observation of the prompt emission
  4. GRB 130505A: Suzaku WAM observation of the prompt emission
  5. GRB 130427A, Watcher afterglow detection
  6. GRB 130505B: Swift Candidate Afterglow
  7. Refined IPN Triangulation of GRB 130502B
  8. GRB 130505A, Swift-BAT refined analysis
  9. GRB 130504C: further Swift-XRT observations
  10. GRB 130505A: optical observations
  11. GRB 130504C: Swift-XRT observations
  12. GRB 130427A: optical observations in CrAO
  13. GRB 130502A: optical upper limit
  14. GRB 130505A: Swift-XRT refined Analysis
  15. GRB 130505A: Largest E_iso ever measured
  16. Konus-Wind observation of GRB 130505A
  17. GRB 130504C: Fermi-LAT detection of a burst
  18. Swift/UVOT observations of GRB130505A
  19. GRB 130505A: Enhanced Swift-XRT position
  20. GRB 130505A: MAXI/GSC detection
  21. GRB 130505A: Swift detection of a burst with optical afterglow
  22. IPN Triangulation of GRB 130504B
  23. GRB 130504A: Bassano Bresciano Observatory optical upper limit
  24. GRB 130504A: Enhanced XRT position
  25. GRB 130502B: Suzaku WAM observation of the prompt emission
  26. GRB 130504A: Swift/UVOT Upper Limits
  27. GRB 130502B: Swift-XRT refined Analysis
  28. GRB 130504A, Swift-BAT refined analysis
  29. Swift-XRT X-ray afterglow candidate for GRB 130504A (BAT trigger 555096)
  30. Trigger 555096: Swift detection of a possible burst
  31. GRB 130502A: Swift-BAT refined analysis
  32. GRB130502A: MASTER-Net optical observations
  33. GRB 130502A: Swift-XRT refined Analysis
  34. IPN Triangulation of GRB 130502B
  35. GRB 130502A: Fermi GBM detection
  36. GRB 130502B: Swift/UVOT Upper Limits
  37. GRB 130502A: Swift/UVOT Upper Limits
  38. GRB 130502B Swift-XRT observations
  39. GRB 130502A: RATIR Optical and NIR Observations
  40. GRB 130502A: Enhanced Swift-XRT position
  41. GRB 130502B: Fermi LAT Detection
  42. GRB 130502A: T100 Observations
  43. GRB 130502A: Swift detection of a burst
  44. GRB 130427A: Predictions about the occurrence of a supernova
  45. GRB 130427A: High-energy neutrino search
  46. Swift-BAT trigger 554135 is noise
  47. GRB 130427A: Challis Observatory optical observations
  48. GRB 130427A: Continued Skynet/PROMPT Observations
  49. GRB 130427A: Fermi-LAT refined analysis
  50. GRB 130418A: Bassano Bresciano Observatory lightcurve analisis
  51. GRB 130427A: Improved Swift-XRT analysis
  52. GRB 100728A: GROND host detection and X-shooter redshift
  53. GRB 130427A: Skynet/PROMPT Observations
  54. GRB 130427B: RATIR Optical and NIR Observations
  55. GRB 130427A, Optical Observations
  56. Konus-Wind observation of GRB 130427A
  57. GRB 130427A: Kanata/HOWPol optical imaging polarimetry
  58. GRB 130427A: Swift-XRT refined Analysis
  59. GRB 130427A: SPI-ACS/INTEGRAL observations
  60. GRB 130427B: Swift-XRT refined Analysis
  61. GRB 130427A: RAPTOR Bright Counterpart Before Swift Trigger
  62. GRB 130427A: T100 observations
  63. GRB 130427A: optical observations in CrAO
  64. GRB 130427A: Fermi GBM observation
  65. GRB130427A: Swift/UVOT followup observations of an Optical Afterglow
  66. GRB 130427A: Fermi-LAT detection of a burst
  67. GRB 130427A: Swift-BAT refined analysis
  68. GRB 130427B: Swift-BAT refined analysis
  69. GRB 130427A: Zadko observatory - Gingin optical observations
  70. GRB 130427B: Enhanced Swift-XRT position
  71. GRB 130427A: MAXI/GSC detection
  72. GRB 130427B: Faulkes Telescope North afterglow detection
  73. GRB 130427B: Swift detection of a burst with optical counterpart
  74. GRB 130427A: Continued P60 follow-up of an extremely bright optical afterglow
  75. GRB 130427A: PAIRITEL NIR Detections
  76. GRB 130427A: Faulkes Telescope North detection
  77. GRB 130427A: early optical observations
  78. GRB 130427A: Swift detection of a very bright burst with a likely bright optical counterpart
  79. GRB 130420A: Continued Skynet/GORT Observations/Detections
  80. GRB 130420B: CARMA and VLA radio observations
  81. Trigger 554491: Swift detection of a spike possibly from Sgr A*
  82. GRB 130420A: Continued RATIR Optical and NIR Observations
  83. GRB 130420A: ROTSE-III data analysis
  84. GRB 130420A: Continued RATIR Optical and NIR Observations
  85. GRB 130420A: Early RAPTOR Simultaneous Multi-Color Observations
  86. GRB 130420B: Fermi GBM observation
  87. Swift Trigger 554135 is probably not a GRB or transient
  88. GRB 130420B: RATIR Optical and NIR Observations
  89. GRB 130420B: Swift-XRT refined Analysis
  90. GRB 130420A: Fermi GBM observation
  91. GRB 130420A: ISON-NM optical observations
  92. Skynet/GORT observations of GRB130420A
  93. GRB 130420B: Swift/UVOT Upper Limits
  94. GRB 130420A: Swift/UVOT Detection
  95. GRB 130420A: Swift-XRT refined Analysis
  96. GRB 130420B: Enhanced Swift-XRT position
  97. GRB 130420B, Swift-BAT refined analysis
  98. GRB 130420A, Swift-BAT refined analysis
  99. Konus-Wind observation of GRB 130418A
  100. GRB 130420A: Enhanced Swift-XRT position

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