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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"

21945 results found.

  1. GRB 140629A: MASTER-Net preliminary light curve
  2. GRB 140629A: SAO RAS monitoring
  3. GRB 140629A: Nishi-Harima NIR Observations
  4. GRB 140629A: Swift/UVOT Detection
  5. GRB140629A: VATT optical observations
  6. GRB 140629A: P60 observations
  7. GRB 140629A: MITSuME Ishigakijima Optical Observation
  8. GRB 140629A: T100 observations
  9. GRB 140629A: NOT optical observations
  10. GRB 140629A: KWFC z-band photometry
  11. GRB 140629A: RTT150 optical observations
  12. GRB 140629A: Enhanced Swift-XRT position
  13. GRB 140629A: Swift detection of a burst with an optical counterpart
  14. GRB 140628A: GROND observation of the afterglow
  15. GRB 140628A: Swift-XRT refined Analysis
  16. GRB 140628A: Zadko observatory - Gingin optical observations
  17. GRB 140628A: Swift/UVOT Detection
  18. GRB 140628A: Swift/UVOT Detection
  19. GRB 140628A: Swift-XRT afterglow detection and enhanced position
  20. GRB 140626A: TAROT La Silla observatory optical observations
  21. GRB 140622A: TAROT La Silla observatory optical observations
  22. GRB 140628A: Swift detection of a burst
  23. GRB 140619B: Magellan near-infrared observations
  24. Swift Trigger 602668: XRT and UVOT confirm is not astrophysical source
  25. GRB 140623A: further Swift-XRT observations
  26. Swift Trigger 602668 is probably not an astrophysical source
  27. GRB 140626A: Swift/UVOT Upper Limits
  28. GRB 140626A: Enhanced Swift-XRT position
  29. GRB 140626A: GROND Afterglow Candidate
  30. GRB 140619B: Suzaku WAM observation of the prompt emission
  31. GRB 140626A: Swift detection of a burst
  32. GRB 140623A: Swift-XRT and UVOT observations
  33. GRB 140621A: Swift-XRT observations
  34. GRB 140622A: iTelescope.Net T11 Optical Observation
  35. GRB 140622A: Swift/UVOT Upper Limits
  36. Konus-Wind observation of GRB 140621A
  37. IPN Triangulation of GRB 140621A
  38. Konus-Wind observation of GRB 140619A
  39. GRB 140620A / iPTF14cva: Konkoly optical observations
  40. GRB 140622A: VLT/X-shooter redshift
  41. GRB 140622A: RATIR Optical and NIR Observations
  42. GRB 140622A: GROND Upper limits
  43. GRB 140622A: Enhanced Swift-XRT position
  44. GRB 140622A: Swift detection of a short burst
  45. GRB 140620A: Swift/UVOT Detection
  46. GRB 140606B / iPTF 14bfu: SAO RAS optical observations
  47. Konus-Wind observation of GRB 140619C
  48. GRB 140620A: Swift-XRT observations
  49. GRB 140620A / iPTF14cva: Fermi GBM observations
  50. GRB 140619A: Swift-BAT refined analysis
  51. GRB 140610A: TShAO optical upper limit
  52. GRB 140619B: Fermi-LAT Detection
  53. GRB 140619B: Fermi GBM detection of a short GRB
  54. GRB 140619A: Swift/UVOT Observations
  55. GRB 140619A: Enhanced Swift-XRT position
  56. GRB 140619A: Swift detection of a burst with a possible optical counterpart
  57. Swift-BAT trigger 601928: Detection of a possible outburst from V490 Cep
  58. GRB 140606B: Swift XRT final light curve
  59. GRB 140606A: BTA and OSN optical observations
  60. GRB 140614B: MOSFIRE Ks-band nondetection
  61. GRB 140614B: MITSuME Akeno upper limits
  62. GRB 140614B: MITSuME Okayama upper limits
  63. GRB 140614B: Swift-BAT refined analysis
  64. GRB 140606B / iPTF 14bfu: Mondy optical observations
  65. GRB 140614B: Swift/UVOT Upper Limits
  66. GRB 140614B: RATIR Optical and NIR Observations
  67. GRB 140606B / iPTF 14bfu: AAO optical observations
  68. GRB 140614A: Swift/UVOT Upper Limits
  69. GRB 140614B: Enhanced Swift-XRT position
  70. GRB 140614B: Swift detection of a burst
  71. GRB 140614A: Enhanced Swift-XRT position
  72. GRB 140614A: GROND afterglow candidate
  73. GRB 140614A: Swift detection of a burst
  74. Konus-Wind observation of GRB 140611A
  75. GRB 140610A: Swift-XRT refined Analysis
  76. GRB 140606B / iPTF 14bfu: MOSFIRE NIR imaging
  77. GRB 140611A Detection of a source in BAT ground analysis
  78. IPN Triangulation of GRB 140611A (short/hard)
  79. GRB 140610A: RATIR Optical and NIR Observations
  80. GRB 140610A: MASTER optical observations
  81. GRB 140610A: Swift/UVOT Upper Limits
  82. Konus-Wind observation of GRB 140610A
  83. Swift/XRT returns to normal observing
  84. GRB 140610A: Swift-XRT observations
  85. Konus-Wind observation of GRB 140606B
  86. GRB 140606B: Swift XRT refined analysis
  87. GRB 140521A: AAO optical upper limit
  88. GRB 140606A: AAO optical upper limit
  89. GRB 140606B: Swift/UVOT Upper Limits
  90. GRB140606B/iPTF14bfu: Discovery Channel Telescope Optical Detection
  91. GRB 140606B: Swift XRT position
  92. GRB 140606A: Nanshan optical upper limit
  93. GRB 140606A: Swift/UVOT Upper Limits
  94. GRB 140606A: Swift-XRT upper limits
  95. Konus-Wind observation of GRB 140604A
  96. GRB 140523A: further Swift-XRT observations
  97. Konus-Wind observation of GRB 140528A
  98. GRB 140529A: Swift/UVOT Upper Limits
  99. GRB 140529A: Swift-XRT afterglow detection.
  100. GRB 140408A: Withdrawal of afterglow candidate

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