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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"

43862 results found.

  1. GRB 140623A / iPTF14cyb: Fermi GBM detection
  2. GRB 140621A: Swift-XRT observations
  3. GRB 140622A: iTelescope.Net T11 Optical Observation
  4. GRB 140621A: Fermi GBM detection
  5. Konus-Wind observation of GRB 140621A
  6. IPN Triangulation of GRB 140621A
  7. Konus-Wind observation of GRB 140619A
  8. Fermi 425193729 / iPTF14cyb: Discovery of optical afterglow
  9. GRB 140620A / iPTF14cva: Konkoly optical observations
  10. GRB 140622A: Swift-XRT refined Analysis
  11. GRB 140622A: An unusual short event, Swift-BAT refined analysis
  12. GRB 140622A: VLT/X-shooter redshift
  13. GRB 140622A: RATIR Optical and NIR Observations
  14. GRB 140622A: GROND Upper limits
  15. GRB 140622A: Enhanced Swift-XRT position
  16. GRB 140622A: Swift detection of a short burst
  17. GRB 140620A: Swift/UVOT Detection
  18. GRB 140606B / iPTF 14bfu: SAO RAS optical observations
  19. Konus-Wind observation of GRB 140619C
  20. GRB 140620A: Swift-XRT observations
  21. IPN Triangulation of GRB 140619C (long/very intense)
  22. GRB 140620A / iPTF14cva: Fermi GBM observations
  23. Fermi 424934131 / iPTF14cva: Discovery and Redshift of Optical Afterglow
  24. GRB 140619B: Swift-XRT observations
  25. GRB 140619A: Swift-BAT refined analysis
  26. GRB 140610A: TShAO optical upper limit
  27. GRB 140619B: Fermi-LAT Detection
  28. GRB 140619B: Fermi GBM detection of a short GRB
  29. GRB 140619A: Swift/UVOT Observations
  30. GRB 140619A: Swift-XRT refined Analysis
  31. GRB 140619A: Enhanced Swift-XRT position
  32. GRB 140619A: Swift detection of a burst with a possible optical counterpart
  33. Swift trigger 601928 is V490 Cep: BAT+XRT refined analysis.
  34. Swift-BAT trigger 601928: Detection of a possible outburst from V490 Cep
  35. GRB 140606B: Swift XRT final light curve
  36. GRB 140606A: BTA and OSN optical observations
  37. GRB 140614C: 1.23m CAHA (+EDIPO) observations
  38. GRB 140614B: MOSFIRE Ks-band nondetection
  39. GRB 140614C found in ground analysis of BAT data
  40. GRB 140614B: Swift-XRT refined Analysis
  41. GRB 140614B: Swift-BAT refined analysis
  42. GRB 140606B / iPTF 14bfu: Mondy optical observations
  43. GRB 140614A: Swift-BAT refined analysis
  44. GRB 140614A: X-shooter redshift
  45. GRB 140614B: RATIR Optical and NIR Observations
  46. GRB 140606B / iPTF 14bfu: AAO optical observations
  47. GRB 140614A: Swift-XRT refined Analysis
  48. GRB 140614B: Enhanced Swift-XRT position
  49. GRB 140614B: Swift detection of a burst
  50. GRB 140614A: Enhanced Swift-XRT position
  51. GRB 140614A: GROND afterglow candidate
  52. GRB 140614A: Swift detection of a burst
  53. GRB 140611A: Swift-XRT observations
  54. Konus-Wind observation of GRB 140611A
  55. GRB 140610A: Swift-XRT refined Analysis
  56. GRB 140606B / iPTF 14bfu: MOSFIRE NIR imaging
  57. GRB 140611A Detection of a source in BAT ground analysis
  58. GRB 140610A: Fermi GBM Detection
  59. IPN Triangulation of GRB 140611A (short/hard)
  60. GRB 140610A: RATIR Optical and NIR Observations
  61. GRB 140610A: Swift-BAT refined analysis
  62. GRB 140610A: MASTER optical observations
  63. GRB 140610A: Swift/UVOT Upper Limits
  64. Konus-Wind observation of GRB 140610A
  65. Swift/XRT returns to normal observing
  66. GRB140606B: DCT time of observation correction
  67. GRB 140610A: Swift-XRT observations
  68. GRB 140610A: Swift detection of a burst
  69. Konus-Wind observation of GRB 140606B
  70. GRB 140606B: Swift XRT refined analysis
  71. GRB 140521A: AAO optical upper limit
  72. GRB 140606A: AAO optical upper limit
  73. GRB 140607A: Swift-BAT refined analysis
  74. IPN Triangulation of GRB 140606B
  75. GRB140606B/iPTF14bfu: Discovery Channel Telescope Optical Detection
  76. GRB 140606B: Swift XRT position
  77. GRB 140606B / Fermi 432717114 / iPTF 14bfu: Keck redshift
  78. GRB 140607A: Swift detection of a burst
  79. GRB 140606B: Fermi GBM detection
  80. Fermi 423717114: Additional P48 and P60 observations
  81. GRB 140606A: BOOTES-2 optical upper limit
  82. Fermi423717114: iPTF optical transient candidates
  83. GRB 140606A: Nanshan optical upper limit
  84. GRB 140606A: Swift-XRT upper limits
  85. Swift XRT status update
  86. Swift Trigger 600914 is noise
  87. GRB 140606A: Swift-BAT refined analysis
  88. GRB 140606A: Swift detection of a short hard burst
  89. Swift Trigger 600914 is probably a noise fluctuation
  90. Konus-Wind observation of GRB 140604A
  91. IPN Triangulation of GRB 140604A (short/hard)
  92. Swift XRT is off-line
  93. GRB 140523A: further Swift-XRT observations
  94. GRB 140528A: Fermi GBM Detection
  95. GRB 140529A BAT refined analysis
  96. Konus-Wind observation of GRB 140529A
  97. Konus-Wind observation of GRB 140528A
  98. GRB 140529A: Swift-XRT afterglow detection.
  99. GRB 140408A: Withdrawal of afterglow candidate
  100. GRB 140529A found in ground analysis of BAT slew data

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