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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"

45754 results found.

  1. Further Swift/XRT observations of GRB140620A/iPTFcva
  2. GRB140606B/iPTF14bfu: Keck detection of an associated supernova
  3. GRB 140620A / iPTF14cva: TShAO optical observations
  4. GRB 140624A: Fermi GBM observation of a short burst
  5. GRB 140623A: Swift-XRT and UVOT observations
  6. GRB 140623A / iPTF14cyb: Fermi GBM detection
  7. GRB 140621A: Swift-XRT observations
  8. GRB 140622A: iTelescope.Net T11 Optical Observation
  9. GRB 140621A: Fermi GBM detection
  10. GRB 140622A: Swift/UVOT Upper Limits
  11. Konus-Wind observation of GRB 140621A
  12. IPN Triangulation of GRB 140621A
  13. Konus-Wind observation of GRB 140619A
  14. Fermi 425193729 / iPTF14cyb: Discovery of optical afterglow
  15. GRB 140622A: KAIT Optical Upper Limit
  16. GRB 140620A / iPTF14cva: Konkoly optical observations
  17. GRB 140622A: Swift-XRT refined Analysis
  18. GRB 140622A: An unusual short event, Swift-BAT refined analysis
  19. GRB 140622A: VLT/X-shooter redshift
  20. GRB 140622A: RATIR Optical and NIR Observations
  21. GRB 140622A: GROND Upper limits
  22. GRB 140622A: Enhanced Swift-XRT position
  23. GRB 140622A: Swift detection of a short burst
  24. GRB 140620A: Swift/UVOT Detection
  25. GRB 140606B / iPTF 14bfu: SAO RAS optical observations
  26. Correction to GCN 16429 (GRB 140619C)
  27. Konus-Wind observation of GRB 140619C
  28. GRB 140620A: Swift-XRT observations
  29. IPN Triangulation of GRB 140619C (long/very intense)
  30. GRB 140620A / iPTF14cva: Fermi GBM observations
  31. Fermi 424934131 / iPTF14cva: Discovery and Redshift of Optical Afterglow
  32. GRB 140619B: Swift-XRT observations
  33. GRB 140619A: Swift-BAT refined analysis
  34. GRB 140610A: TShAO optical upper limit
  35. GRB 140619B: Fermi-LAT Detection
  36. GRB 140619B: Fermi GBM detection of a short GRB
  37. GRB 140619A: Swift/UVOT Observations
  38. GRB 140619A: Swift-XRT refined Analysis
  39. GRB 140619A: Enhanced Swift-XRT position
  40. GRB 140619A: Swift detection of a burst with a possible optical counterpart
  41. Swift trigger 601928 is V490 Cep: BAT+XRT refined analysis.
  42. Swift-BAT trigger 601928: Detection of a possible outburst from V490 Cep
  43. GRB 140606B: Swift XRT final light curve
  44. GRB 140606A: BTA and OSN optical observations
  45. GRB 140614C: 1.23m CAHA (+EDIPO) observations
  46. GRB 140614B: MOSFIRE Ks-band nondetection
  47. GRB 140614C found in ground analysis of BAT data
  48. GRB 140614B: MITSuME Akeno upper limits
  49. GRB 140614B: Swift-XRT refined Analysis
  50. GRB 140614B: MITSuME Okayama upper limits
  51. GRB 140614B: Swift-BAT refined analysis
  52. GRB 140606B / iPTF 14bfu: Mondy optical observations
  53. GRB 140614A: Swift-BAT refined analysis
  54. GRB 140614A: X-shooter redshift
  55. GRB 140614B: Swift/UVOT Upper Limits
  56. GRB 140614B: RATIR Optical and NIR Observations
  57. GRB 140606B / iPTF 14bfu: AAO optical observations
  58. GRB 140614A: Swift/UVOT Upper Limits
  59. GRB 140614A: Swift-XRT refined Analysis
  60. GRB 140614B: Enhanced Swift-XRT position
  61. GRB 140614B: Swift detection of a burst
  62. GRB 140614A: Enhanced Swift-XRT position
  63. GRB 140614A: GROND afterglow candidate
  64. GRB 140614A: Swift detection of a burst
  65. GRB 140611A: Swift-XRT observations
  66. Konus-Wind observation of GRB 140611A
  67. GRB 140610A: Swift-XRT refined Analysis
  68. GRB 140606B / iPTF 14bfu: MOSFIRE NIR imaging
  69. GRB 140611A Detection of a source in BAT ground analysis
  70. GRB 140610A: Fermi GBM Detection
  71. IPN Triangulation of GRB 140611A (short/hard)
  72. GRB 140610A: RATIR Optical and NIR Observations
  73. GRB 140610A: Swift-BAT refined analysis
  74. GRB 140610A: MASTER optical observations
  75. GRB 140610A: Swift/UVOT Upper Limits
  76. Konus-Wind observation of GRB 140610A
  77. Swift/XRT returns to normal observing
  78. GRB140606B: DCT time of observation correction
  79. GRB 140610A: Swift-XRT observations
  80. GRB 140610A: Swift detection of a burst
  81. Konus-Wind observation of GRB 140606B
  82. GRB 140606B: Swift XRT refined analysis
  83. GRB 140521A: AAO optical upper limit
  84. GRB 140606A: AAO optical upper limit
  85. GRB 140607A: Swift-BAT refined analysis
  86. IPN Triangulation of GRB 140606B
  87. GRB 140606B: Swift/UVOT Upper Limits
  88. GRB140606B/iPTF14bfu: Discovery Channel Telescope Optical Detection
  89. GRB 140606B: Swift XRT position
  90. GRB 140606B / Fermi 432717114 / iPTF 14bfu: Keck redshift
  91. GRB 140607A: Swift detection of a burst
  92. GRB 140606B: Fermi GBM detection
  93. Fermi 423717114: Additional P48 and P60 observations
  94. GRB 140606A: BOOTES-2 optical upper limit
  95. Fermi423717114: iPTF optical transient candidates
  96. GRB 140606A: Nanshan optical upper limit
  97. GRB 140606A: Swift/UVOT Upper Limits
  98. GRB 140606A: Swift-XRT upper limits
  99. Swift XRT status update
  100. GRB 140606A: Swift-BAT refined analysis

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