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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"

3762 results found.

  1. GRB 130610A: Fermi GBM Observation
  2. GRB 130610A: Skynet/PROMPT detection of the optical afterglow
  3. GRB 130610A - Liverpool Telescope Optical Afterglow Confirmation
  4. GRB 130610A: Swift detection of a burst with an optical counterpart
  5. GRB 130603A: AAO optical observations
  6. GRB 130605A: Swift-BAT refined analysis
  7. GRB 130603B: VLT/X-shooter redshift confirmation
  8. GRB 130603B: Afterglow detection from NOT
  9. GRB 130603B: WHT optical afterglow candidate
  10. GRB 130528A: Fermi GBM detection
  11. GRB 130527A: Suzaku WAM observation of the prompt emission
  12. GRB 130528A: optical upper limit
  13. GRB 130527A: NOT optical counterpart
  14. GRB 130521A, Swift-BAT refined analysis
  15. GRB 130521A: TAROT La Silla observatory optical observations
  16. GRB 130518A Swift-BAT position from ground analysis
  17. Refined IPN Triangulation of GRB 130502B
  18. GRB 130504C: Fermi GBM detection
  19. GRB 130505A: Swift detection of a burst with optical afterglow
  20. GRB 130427A: KAIT optical observations
  21. GRB 130427A: Continued Skynet/PROMPT Observations
  22. GRB 130427A: further GMG observations
  23. GRB 130427A: CrAO RT-22 36 GHz observation
  24. GRB 130427B: MITSuME Ishigakijima upper limits
  25. GRB 130427A: MITSuME Okayama and Ishigakijima Optical Observation after 1 day
  26. GRB 130427A: Skynet/PROMPT Observations
  27. GRB 130427A: CARMA 3mm observations
  28. GRB 130427B: Tentative VLT/X-shooter redshift
  29. GRB 130427A : Xinglong TNT optical observation
  30. GRB 130427A: VLT/X-shooter redshift confirmation
  31. GRB 130427A optical time series
  32. GRB 130427A: SNUO/SOAO/BOAO Observation
  33. GRB 130427A: T100 observations
  34. IPN Triangulation of GRB 130425A
  35. GRB 130420B: MASTER-Net optical observations
  36. GRB 130420A: Swift detection of a burst with an optical counterpart
  37. GRB 130408A, Swift-BAT refined analysis
  38. GRB 130408A: Swift-XRT refined Analysis
  39. GRB 130327B: Fermi-LAT detection of a burst
  40. GRB 130327B: gamma-ray detection by AGILE
  41. Konus-Wind observation of GRB 130325A
  42. IPN Triangulation of GRB 130320A (long/very bright)
  43. Swift XRT observations of GRB 130310A
  44. GRB 130306A: MITSuME Ishigakijima upper limits
  45. GRB 130305A: Optical Observations
  46. GRB 100615A: HST host detection and X-shooter redshift
  47. GBM trigger 383712005 (GRB 130228A?) : Possible high-energy photon emission in Fermi/LAT data
  48. GRB 121128A: optical observations in Mondy observatory
  49. GRB 130216A: possible early detection at 15 GHz
  50. GRB 130215A: CARMA 3mm detection
  51. GRB 121128A: optical observations
  52. GRB 121123A: optical observations
  53. GRB 130206A: XRT and UVOT follow-up observations.
  54. GRB 130206A: Swift detection of a burst
  55. Swift/BAT trigger 547142 is new source Swift J1753.7-2544
  56. Swift Trigger 547142: MAXI/GSC upper limit
  57. GRB 130122A: MASTER-Net early marginal detection of the OT
  58. GRB 121229A: MAXI/GSC detection
  59. GRB 121209A: Swift-XRT refined Analysis
  60. GRB 121209A: Swift-BAT refined analysis
  61. GRB 121128A: Optical Observations
  62. GRB 121201A: GROND afterglow observations and photometric redshift
  63. GRB 121128A: MITSuME Akeno Optical upper limits
  64. GRB 121128A: optical observation in Mondy observatory
  65. GRB 121128A: WSRT radio observation
  66. GRB 121128A: Fermi GBM observation
  67. GRB 121128A - Gemini North redshift
  68. GRB 121128A: FTN optical afterglow confirmation
  69. Fermi GBM trigger 121115.186 is not a GRB
  70. GRB 121108A: Enhanced Swift-XRT position
  71. GRB 121108A: Swift detection of a burst
  72. GRB 121027A: Brightening IR counterpart
  73. GRB 121028A: MITSuME Okayama Optical upper limits
  74. GRB 121028A: Faulkes Telescope North observations
  75. GRB 121017A: Swift detection of a burst
  76. GRB 121011A: Swift-XRT refined Analysis
  77. GRB 121011A: MASTER-Net bell light curve
  78. Trigger 535733: Swift possible detection of SAX J1828.5-1037
  79. GRB 120927A: optical upper limit
  80. GRB 120927A: GROND upper limits
  81. GRB 120916A Suzaku WAM observation of the prompt emission
  82. GRB 120923A: EVLA Observations
  83. GRB 120922A: Swift detection of a burst
  84. IPN Triangulation of long GRB 120919B
  85. IPN Triangulation of long GRB 120919A
  86. GRB 120909A: Swift-BAT refined analysis
  87. GRB 120830A: Swift-XRT and UVOT observations
  88. GRB 120819A: MITSuME Ishigakijima upper limits
  89. GRB 120815A: Swift-BAT refined analysis
  90. GRB 120807A: Enhanced Swift-XRT position
  91. GRB 120807A: Swift detection of a burst
  92. Fermi/GBM detection of an SGR-like burst
  93. GRB 120728A: Fermi GBM observation
  94. GRB 120805A: Swift detection of a burst
  95. GRB 120804A: EVLA Detection
  96. GRB 120804A: Gemini-North observations
  97. GRB 120803B: MITSuME Akeno Optical upper limits
  98. GRB 120728B: Fermi GBM detection
  99. IPN Triangulation of GRB 120728B (long/intense)
  100. Swift Trigger 529076 is from Swift J1910.2-0546 and is not a GRB

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