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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"

3060 results found.

  1. GRB 150323C: Khureltogot optical observations
  2. IPN Triangulation of GRB 150330A (long/very intense)
  3. GRB 141121A: GMG observation
  4. GRB 150323A: P60 Optical Afterglow Candidate
  5. GRB 150314A: KAIT Optical Observations
  6. GRB 150314A: KAIT Optical Candidate
  7. GRB 150309A: Swift-BAT refined analysis
  8. GRB 150301B: Swift/UVOT Observations
  9. GRB 150301A: Swift-BAT refined analysis
  10. GRB 150301B: MASTER early OT detection
  11. GRB 150301B: Swift detection of a burst with an optical afterglow
  12. Fermi GBM Observations of SGR 1935+2154
  13. SGR 1935+2154: Swift-BAT refined analysis
  14. GRB 150222A: MASTER early optical observations
  15. Trigger 631747: Swift detection of 4U 0614+09
  16. GRB 150213B: Swift-BAT refined analysis
  17. GRB 150212A: Swift detection of a burst
  18. GRB 150211A: Swift-BAT refined analysis
  19. GRB 150206B: Fermi GBM detection
  20. GRB 150203A: Swift-BAT refined analysis
  21. Fermi GBM trigger 150202624 is not a GRB
  22. GRB 150203A: Enhanced Swift-XRT position
  23. GRB 150203A: Prompt enhanced Swift-XRT position
  24. GRB 150203A: Swift detection of a burst
  25. Konus-Wind observation of GRB 150127B
  26. Konus-Wind observation of GRB 150126A reveals its ultra-long nature
  27. GRB 150120A: Fermi GBM observation
  28. GRB 150120A: Swift detection of a possibly-short burst
  29. Trigger 626581: Swift detection of GRO J1008-57
  30. GRB 150110A: MASTER inspection
  31. Swift detection of 4U 1700+24 (= V* V934 Her)
  32. GRB 150103A: Swift-BAT refined analysis
  33. Short burst found in ground analysis of Swift-BAT data
  34. GRB 141229A: Deep MASTER inspection
  35. GRB 141229A: MAXI/GSC detection
  36. IPN Triangulation of GRB 141222A (very intense)
  37. GRB 141220A: Swift-BAT refined analysis
  38. GRB 141220A: LT optical afterglow observations
  39. IPN Triangulation of GRB 141215A (long/intense)
  40. Konus-Wind observation of GRB 141212B
  41. GRB 141212B: Swift detection of a burst
  42. IPN Triangulation of GRB 141125A (short/hard)
  43. GRB 141121A: Mondy optical observations
  44. GRB 141121A: MAXI/GSC detection
  45. GRB141121A: BOOTES-2/TELMA upper limit
  46. GRB 141109A: further VLA observations
  47. GRB 141109B: MITSuME Akeno upper limits
  48. GRB 141102A: Fermi GBM detection
  49. GRB 141031A: Fermi GBM detection
  50. GRB 141028A: SAO RAS Zeiss-1000 photometry
  51. GRB 141028A: GROND Afterglow confirmation (MASTER source)
  52. GRB 141026A: Swift detection of a burst
  53. GRB 141017A, Swift-BAT refined analysis
  54. GRB 141015A: Swift detection of a burst
  55. Swift detection of outburst from 4U 1700+24
  56. Refined IPN Triangulation of GRB 140906C
  57. GRB 140828A, Swift-BAT refined analysis
  58. GRB 140828A: Fermi GBM observation
  59. IPN Triangulation of GRB 140825A (very intense/long)
  60. IPN triangulation of GRB 140810A
  61. GRB 140801A: AAO optical observations
  62. GRB 140801A: BTA confirmation of redshift
  63. GRB 140801A: archival upper limits on the host galaxy
  64. Swift Trigger 607506 is probably noise
  65. Konus-Wind observation of GRB 140716A
  66. GRB 140709B: Swift-BAT refined analysis
  67. GRB 140709A, Swift-BAT refined analysis
  68. GRB 140705A / SGR 1935+2154: Optical observations from 10.4m GTC
  69. GRB 140705A: MITSuME Ishigakijima upper limits
  70. GRB 140705A: MITSuME Okayama upper limits
  71. GRB 140705A: Swift-BAT refined analysis of a possible newly discovered SGR 1935+2154
  72. GRB 140705A: Swift detection of a short burst
  73. GRB 140703A: Monte Agliale Observatory optical observations
  74. GRB 140629A: SAO RAS monitoring
  75. GRB 140629A: MITSuME Ishigakijima Optical Observation
  76. GRB 140626A: Swift-BAT refined analysis
  77. GRB 140622A: An unusual short event, Swift-BAT refined analysis
  78. IPN Triangulation of GRB 140619C (long/very intense)
  79. GRB 140619A: Swift-BAT refined analysis
  80. Swift-BAT trigger 601928: Detection of a possible outburst from V490 Cep
  81. GRB 140606B / iPTF 14bfu: MOSFIRE NIR imaging
  82. IPN Triangulation of GRB 140606B
  83. IPN Triangulation of GRB 140528A
  84. GRB 140523A: NOT observation
  85. IPN Triangulation of GRB 140523A
  86. GRB 140523A: possible X-ray afterglow candidate from tiled Swift/XRT observations
  87. GRB 140516A: further Swift-XRT analysis
  88. GRB 140518A, Swift-BAT refined analysis
  89. GRB 140516A: Swift-BAT refined analysis
  90. GRB 140516A: Enhanced Swift-XRT position
  91. GRB 140516A: Swift detection of a short burst
  92. GRB 140515A: Swift-BAT refined analysis
  93. GRB 140512A: Mondy optical detection
  94. GRB 140509B: MAXI/GSC detection
  95. GRB 140430A: MITSuME Akeno upper limits
  96. GRB 140428A: Keck detection of a red optical afterglow candidate
  97. Swift trigger 593744: detection of a flare from UV Cet
  98. GRB 140320C: Mondy optical observations and afterglow confirmation
  99. GRB 140323A: Swift-BAT refined analysis
  100. GRB 140320C: Swift-XRT detection of the X-ray afterglow

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