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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"

41916 results found.

  1. GRB160601A: Gemini Imaging
  2. GRB 160601A: GTC observations confirming transient source decay
  3. GRB 160601A: Mondy optical observations, photometry of NOT sources
  4. GRB160601A: NOT afterglow confirmation
  5. GRB 160530B CALET Gamma-Ray Burst Monitor detection
  6. GRB 160601A: Swift-XRT refined Analysis
  7. GRB160601A: NOT detection of an afterglow candidate
  8. GRB 160601A: Mondy optical observations
  9. GRB 160601A: MITSuME Okayama Ks-band upper-limit
  10. GRB 160530A: Swift follow-up and X-ray afterglow candidate
  11. GRB 160601A: MITSuME Okayama upper limits
  12. GRB 160601A: Swift detection of a short hard burst
  13. Konus-Wind observation of GRB 160530A
  14. IPN Triangulation of GRB 160530A
  15. GRB 160525B: MITSuME Akeno optical upper limits
  16. GRB 160530B: Fermi GBM Detection
  17. GRB 160530A: discovery with the Compton Spectrometer and Imager
  18. GRB 160530A: Tiled Swift observations
  19. GRB 160525C: CALET Gamma-Ray Burst Monitor detection
  20. GRB 160525B: Mondy optical upper limit
  21. GRB 160525B: Khureltogot optical upper limit
  22. GRB 160525B: Swift-BAT refined analysis
  23. GRB 160525B: Swift-XRT refined Analysis
  24. GRB 160525B: Nanshan optical upper limit
  25. GRB 160525B: Swift/UVOT Detection
  26. GRB 160521B: Swift-XRT afterglow detection
  27. Konus-Wind observation of GRB 160521B
  28. GRB 160525A: Swift-BAT refined analysis
  29. GRB 160525B: Swift detection of a burst
  30. GRB 160525A: Swift detection of a probable burst
  31. Correction - Fermi/GBM trigger 160523919 is a GRB
  32. GRB 160521B: Theoretical estimate of the redshift and urgent need for further x-ray observations
  33. GRB 160425A: SMARTS late-time observations
  34. GRB 160327A: 15 GHz upper limits from AMI
  35. GRB 160321A: 15 GHz upper limits from AMI
  36. GRB 160314A: 15 GHz upper limits from AMI
  37. GRB 160313A: 15 GHz upper limits from AMI
  38. GRB 160521B: Swift/UVOT Upper Limits
  39. GRB 160521B: Swift-XRT observations
  40. Another Swift detection of SGR 1935+2154 (trigger #687124)
  41. Swift detection of SGR 1935+2154
  42. GRB 160521B: Swift ToO observations
  43. GRB 160521B: Fermi-LAT detection
  44. GRB 160521B: Fermi GBM detection
  45. GRB 160521A: a long GRB detected by INTEGRAL
  46. GRB 160519A: Swift-BAT refined analysis
  47. Swift-BAT trigger 686845 was due to noise near a known source
  48. GRB 160519A: Fermi GBM detection
  49. Konus-Wind observation of a bright burst from SGR 1935+2154
  50. FERMI GBM bursts from the magnetar SGR 1935+2154
  51. GRB 160519A: Swift detection of a burst
  52. SGR 1935+2154: AbAO optical upper limit
  53. Fermi GBM triggers of SGR 1935+2154
  54. Trigger 686761: Swift detection of a bright burst from SGR 1935+2154
  55. Fermi GBM trigger 485205628 /160517806 is not a GRB
  56. Fermi GBM trigger 485124591/160516868 is not a GRB
  57. Trigger 686443: Swift detection of SGR 1935+2154
  58. Fermi GBM trigger 484906918/160514349 is not a GRB
  59. GRB 160509A: Further VLA Observations
  60. FACT follow-up of the IceCube event 160427A
  61. Interplanetary Network Search for IceCube 160427A
  62. GRB 160509A MASTER-NET observations
  63. GRB 160509A: CALET Gamma-Ray Burst Monitor detection
  64. GRB 160509A: non-observation of VHE emission with HAWC
  65. GRB 160508A: CALET Gamma-Ray Burst Monitor detection
  66. GRB 160509A: TLS Tautenburg Afterglow Detection
  67. GRB 160509A: Further Swift/UVOT Observations
  68. GRB 160509A Gemini North redshift
  69. Fermi GBM trigger 484574960/160510506 is not a GRB
  70. Konus-Wind observation of GRB 160509A
  71. GRB 160509A: DCT Imaging / Afterglow Confirmation
  72. GRB 160509A: MAXI/GSC refined analysis
  73. GRB 160509A: VLA Detection
  74. GRB 160509A: Fermi-LAT refined analysis
  75. GRB 160509A: Swift/UVOT Upper Limit
  76. GRB 160509A: Fermi GBM Detection
  77. GRB 160509A Gemini North candidate afterglow
  78. GRB 160509A: optical observations
  79. GRB 160509A: Swift-XRT afterglow detection
  80. GRB 160509A: Preliminary XRT positon
  81. GRB 160509A: Tiled Swift observations
  82. Correction to GCN 19404; GRB 160509A: MAXI/GSC detection
  83. GRB 160227A: MAXI/GSC detection
  84. GRB 160509A: Fermi-LAT prompt detection of a very bright burst
  85. GRB 160506A: TAROT La Silla observatory optical observations
  86. LIGO/Virgo G211117: Astrosat CZTI upper limits
  87. GRB 160506A: IRSF upper limits
  88. GRB 160506A: Swift-XRT refined Analysis
  89. GRB 160506A: Swift/UVOT Upper Limits
  90. GRB 160506A: Swift-BAT refined analysis
  91. GRB 160506A: GROND upper limits
  92. GRB 160506A: Swift detection of a burst
  93. GRB 160504A: Swift-BAT refined analysis
  94. IceCube-160427A: iPTF Observations
  95. GRB 160504A: RATIR Optical and NIR Observations
  96. GRB 160504A: Swift/UVOT Upper Limits
  97. GRB160504A: Gemini NIR Observations
  98. GRB 160504A: Bassano Bresciano Observatory upper limits
  99. GRB 160504A: Swift-XRT refined Analysis
  100. GRB 160504A: NOT upper limits

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