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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

27396 results found.

  1. GRB 140706A: Enhanced Swift-XRT position
  2. GRB 140706A: Swift detection of a burst with an optical counterpart
  3. SGR 1935+2154: Swift-BAT observations of additional short soft events
  4. GRB 140705A / SGR 1935+2154: Optical observations from 10.4m GTC
  5. GRB 140705A: MITSuME Ishigakijima upper limits
  6. GRB 140705A: Swift-XRT refined Analysis
  7. GRB 140705A: MITSuME Okayama upper limits
  8. GRB 140705A: Swift/UVOT Upper Limits
  9. GRB 140705A: Swift-BAT refined analysis of a possible newly discovered SGR 1935+2154
  10. GRB 140705A: Enhanced Swift-XRT position
  11. GRB 140705A: Swift detection of a short burst
  12. GRB 140621A: Suzaku WAM observation of the prompt emission
  13. GRB 140629A: SAO RAS Rc band photometry
  14. GRB 140629A, Optical observations
  15. GRB 140703A: RATIR Optical and NIR Observations
  16. GRB 140703A: Monte Agliale Observatory optical observations
  17. GRB 140703A: Swift-XRT refined Analysis
  18. GRB 140703A: Swift-BAT refined analysis
  19. GRB 140703A: Enhanced Swift-XRT position
  20. GRB 140703A: BOOTES-2 and OSN optical observations
  21. GRB 140703A: Swift detection of a burst
  22. GRB 140619C: Suzaku WAM observation of the prompt emission
  23. GRB 140629A: MITSuME Akeno Optical observation
  24. GRB 140629A: SAO RAS monitoring
  25. Fermi 425667201: optical counterpart search
  26. GRB 140629A: Nishi-Harima NIR Observations
  27. Konus-Wind observation of GRB 140629A
  28. GRB 140629A: Swift/UVOT Detection
  29. GRB140629A: VATT optical observations
  30. GRB 140629A: P60 observations
  31. GRB 140629A: Swift-XRT refined Analysis
  32. GRB 140629A: MITSuME Ishigakijima Optical Observation
  33. GRB 140629A: T100 observations
  34. GRB 140629A: NOT optical observations
  35. GRB 140629A: KWFC z-band photometry
  36. GRB 140629A: RTT150 optical observations
  37. GRB 140629A: Swift-BAT refined analysis
  38. GRB 140629A: Enhanced Swift-XRT position
  39. GRB 140629A: Swift detection of a burst with an optical counterpart
  40. GRB 140628A: GROND observation of the afterglow
  41. GRB 140628A: Swift-XRT refined Analysis
  42. GRB 140628A: Zadko observatory - Gingin optical observations
  43. GRB 140628A: Swift-BAT refined analysis
  44. GRB 140628A: Swift/UVOT Detection
  45. GRB 140628A: Swift/UVOT Detection
  46. GRB 140628A: Swift-XRT afterglow detection and enhanced position
  47. GRB 140626A: TAROT La Silla observatory optical observations
  48. GRB 140622A: TAROT La Silla observatory optical observations
  49. GRB 140628A: Swift detection of a burst
  50. GRB 140619B: Magellan near-infrared observations
  51. Swift Trigger 602668: XRT and UVOT confirm is not astrophysical source
  52. Swift Trigger 602668 is probably not an astrophysical source
  53. GRB 140626A: Swift-BAT refined analysis
  54. GRB 140626A: Swift-XRT refined Analysis
  55. GRB 140626A: Swift/UVOT Upper Limits
  56. GRB 140626A: Enhanced Swift-XRT position
  57. GRB 140626A: GROND Afterglow Candidate
  58. GRB 140619B: Suzaku WAM observation of the prompt emission
  59. GRB 140626A: Swift detection of a burst
  60. GRB 140624A: Fermi GBM observation of a short burst
  61. GRB 140623A: Swift-XRT and UVOT observations
  62. GRB 140623A / iPTF14cyb: Fermi GBM detection
  63. GRB 140621A: Swift-XRT observations
  64. GRB 140622A: iTelescope.Net T11 Optical Observation
  65. GRB 140621A: Fermi GBM detection
  66. GRB 140622A: Swift/UVOT Upper Limits
  67. IPN Triangulation of GRB 140621A
  68. Konus-Wind observation of GRB 140619A
  69. Fermi 425193729 / iPTF14cyb: Discovery of optical afterglow
  70. GRB 140620A / iPTF14cva: Konkoly optical observations
  71. GRB 140622A: Swift-XRT refined Analysis
  72. GRB 140622A: An unusual short event, Swift-BAT refined analysis
  73. GRB 140622A: VLT/X-shooter redshift
  74. GRB 140622A: RATIR Optical and NIR Observations
  75. GRB 140622A: GROND Upper limits
  76. GRB 140622A: Enhanced Swift-XRT position
  77. GRB 140622A: Swift detection of a short burst
  78. GRB 140620A: Swift/UVOT Detection
  79. GRB 140606B / iPTF 14bfu: SAO RAS optical observations
  80. GRB 140620A: Swift-XRT observations
  81. GRB 140620A / iPTF14cva: Fermi GBM observations
  82. Fermi 424934131 / iPTF14cva: Discovery and Redshift of Optical Afterglow
  83. GRB 140619A: Swift-BAT refined analysis
  84. GRB 140610A: TShAO optical upper limit
  85. GRB 140619B: Fermi-LAT Detection
  86. GRB 140619B: Fermi GBM detection of a short GRB
  87. GRB 140619A: Swift/UVOT Observations
  88. GRB 140619A: Swift-XRT refined Analysis
  89. GRB 140619A: Enhanced Swift-XRT position
  90. GRB 140619A: Swift detection of a burst with a possible optical counterpart
  91. Swift trigger 601928 is V490 Cep: BAT+XRT refined analysis.
  92. Swift-BAT trigger 601928: Detection of a possible outburst from V490 Cep
  93. GRB 140606B: Swift XRT final light curve
  94. GRB 140606A: BTA and OSN optical observations
  95. GRB 140614C: 1.23m CAHA (+EDIPO) observations
  96. GRB 140614B: MOSFIRE Ks-band nondetection
  97. GRB 140614B: MITSuME Akeno upper limits
  98. GRB 140614B: Swift-XRT refined Analysis
  99. GRB 140614B: MITSuME Okayama upper limits
  100. GRB 140614B: Swift-BAT refined analysis

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