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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"

3779 results found.

  1. GRB 140928A: Fermi GBM detection
  2. GRB 140928A: Fermi-LAT detection
  3. GRB 140916B: iPTF Optical Observations
  4. GRB 140907A: Continued DCT Observations
  5. GRB 140907A : Optical observations from Nanshan
  6. GRB 140828A: Fermi GBM observation
  7. GRB 140824A: Swift detection of a burst
  8. Fermi trigg_num 430148973: bright OT inside large error box!
  9. GRB 140818A: Correction to GCN 16702
  10. GRB 140808A: optical afterglow candidate iPTF14eag
  11. GRB 140713A: 10.4-m GTC deep optical observation
  12. GRB 140706A: Swift-BAT refined analysis
  13. Pre-discovery observations of SGR 1935+2154 in Swift archival data
  14. GRB 140629A: SAO RAS monitoring
  15. Fermi 425667201: optical counterpart search
  16. Swift Trigger 602668 is probably not an astrophysical source
  17. Fermi 423717114: Additional P48 and P60 observations
  18. GRB 140528A: Fermi GBM Detection
  19. Konus-Wind observation of GRB 140529A
  20. GRB 140529A found in ground analysis of BAT slew data
  21. Swift detection of SFXT IGR J17544-2619
  22. IPN Triangulation of GRB 140523A
  23. Swift trigger 599860 probably not real
  24. GRB 140521A: AAO optical observations
  25. GRB 140518A: P60 i-/z-band detections
  26. GRB 140515B: MAXI/GSC detection
  27. GRB 140512A: Mondy optical detection
  28. GRB 140512A: MASTER optical observations
  29. GRB 140509B: MAXI/GSC detection
  30. GRB 140428B: Fermi GBM observation
  31. Trigger 597570: Swift detection of SGR 1806-20
  32. GRB 140428A: Keck detection of a red optical afterglow candidate
  33. GRB 140423A: MITSuME Akeno Optical observation
  34. Konus-Wind observation of GRB 140416A
  35. Swift Trigger 595345 is not an astrophysical source
  36. Swift trigger 594286: Is likely a noise trigger
  37. Retraction of the Fermi/LAT high-energy counterpart for GRB 140330A
  38. Konus-Wind observation of GRB 140330A
  39. Konus-Wind observation of GRB 140329A
  40. Fermi Gamma-ray Burst Monitor trigger 417486540 / 140326020 is not a GRB
  41. GRB 140226A/iPTF14yb: Mondy optical observations
  42. IPN Triangulation of very intense GRB 140320D
  43. GRB 140320A: Swift-BAT refined analysis
  44. GRB 140320C: Swift-XRT detection of the X-ray afterglow
  45. GRB 140320A: Fermi GBM observations suggest a short GRB
  46. GRO J1744-28: Fermi GBM observation
  47. IPN Triangulation of GRB 140308A
  48. GRB 140304A: VLA Detection
  49. GRB 140304A: Swift-BAT refined analysis
  50. GRB 140304A: Enhanced Swift-XRT position
  51. GRB 140304A: Swift detection of a burst
  52. Konus-Wind observation of GRB 140215A
  53. Trigger 586482: Swift detection of GROJ1744-28
  54. GRB 140209A: Swift-BAT Spectral lag analysis
  55. GRB 140209A: Swift detection of a burst
  56. GRB 140129B: MASTER OT early light curve
  57. GRB 140129A: P60 optical afterglow detection
  58. GRB 140103A: AAO optical afterglow candidate
  59. Swift-BAT trigger 582894 is HR 1099 (Flare star)
  60. GRB 140103A: Swift-XRT refined analysis
  61. GRB 140102A: MAXI/GSC detection
  62. GRB 131231A: P60 observations
  63. Konus-Wind observation of GRB 131229A
  64. GRB 131229A: CARMA 3mm observations
  65. GRB 131227A: GROND Upper Limits
  66. GRB 131227A: Enhanced Swift-XRT position
  67. GRB 131227A: OT candidate from KAIT Optical observations
  68. Trigger 581129: Swift-BAT triggered on noise
  69. GRB 131127B: rejection of optical counterpart candidates
  70. GRB 131128A; Fermi GBM observation
  71. GRB 131128A: AROMA-N Optical Observation
  72. GRB 131128A: T100 observations
  73. GRB 131128A: MASTER-Net optical observations
  74. GRB 131127B: Nanshan optical observations
  75. IPN Triangulation of GRB 131127B
  76. Fermi407254341: iPTF optical afterglow candidates
  77. GRB 131122A: Nanshan optical upper limit
  78. GRB 131108A: 1.23m CAHA optical candidate
  79. GRB 131028A: Fermi GBM detection
  80. GRB 131024A: Skynet R-COP optical observations
  81. GRB 131024A: Swift detection of a burst
  82. GRB 131014A: Suzaku WAM observation of the prompt emission
  83. GRB 131002B: Swift detection of a burst
  84. GRB 130925A: continuing Swift/XRT monitoring
  85. GRB 130702A: RTT150 optical observations
  86. GRB 130913A detected in ground analysis of Swift-BAT data
  87. GRB 130912A: P60 Observations
  88. GRB 130912A: Swift detection of a short burst
  89. GRB 130828A: Further Swift XRT observations
  90. GRB 130831A: ISON-Kislovodsk optical observations
  91. GRB 130903A: GROND Afterglow Discovery
  92. GRB 130831A, Swift-BAT refined analysis
  93. IPN triangulation of GRB 130828A - error box
  94. IPN triangulation of GRB 130828A
  95. GRB 130828A: Fermi GBM detection
  96. GRB 130828A: Fermi-LAT detection of a burst
  97. GRB 130816A, Swift-BAT refined analysis
  98. GRB 130816B: Swift detection of a burst
  99. IPN Triangulation of GRB 130812B (long/soft)
  100. IPN localization of GRB 130804A

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