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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"

3533 results found.

  1. GRB 130427A: VLT/X-shooter redshift confirmation
  2. GRB 130427A optical time series
  3. GRB 130427A: SNUO/SOAO/BOAO Observation
  4. GRB 130427A: T100 observations
  5. IPN Triangulation of GRB 130425A
  6. GRB 130420B: MASTER-Net optical observations
  7. GRB 130420A: Swift detection of a burst with an optical counterpart
  8. GRB 130408A, Swift-BAT refined analysis
  9. GRB 130408A: Swift-XRT refined Analysis
  10. GRB 130327B: Fermi-LAT detection of a burst
  11. GRB 130327B: gamma-ray detection by AGILE
  12. Konus-Wind observation of GRB 130325A
  13. IPN Triangulation of GRB 130320A (long/very bright)
  14. Swift XRT observations of GRB 130310A
  15. GRB 130306A: MITSuME Ishigakijima upper limits
  16. GRB 130305A: Optical Observations
  17. GRB 100615A: HST host detection and X-shooter redshift
  18. GBM trigger 383712005 (GRB 130228A?) : Possible high-energy photon emission in Fermi/LAT data
  19. GRB 121128A: optical observations in Mondy observatory
  20. GRB 130216A: possible early detection at 15 GHz
  21. GRB 130215A: CARMA 3mm detection
  22. GRB 121128A: optical observations
  23. GRB 121123A: optical observations
  24. GRB 130206A: XRT and UVOT follow-up observations.
  25. GRB 130206A: Swift detection of a burst
  26. Swift/BAT trigger 547142 is new source Swift J1753.7-2544
  27. Swift Trigger 547142: MAXI/GSC upper limit
  28. GRB 130122A: MASTER-Net early marginal detection of the OT
  29. GRB 121229A: MAXI/GSC detection
  30. GRB 121209A: Swift-XRT refined Analysis
  31. GRB 121209A: Swift-BAT refined analysis
  32. GRB 121128A: Optical Observations
  33. GRB 121201A: GROND afterglow observations and photometric redshift
  34. GRB 121128A: MITSuME Akeno Optical upper limits
  35. GRB 121128A: optical observation in Mondy observatory
  36. GRB 121128A: WSRT radio observation
  37. GRB 121128A: Fermi GBM observation
  38. GRB 121128A - Gemini North redshift
  39. GRB 121128A: FTN optical afterglow confirmation
  40. Fermi GBM trigger 121115.186 is not a GRB
  41. GRB 121108A: Enhanced Swift-XRT position
  42. GRB 121108A: Swift detection of a burst
  43. GRB 121027A: Brightening IR counterpart
  44. GRB 121028A: MITSuME Okayama Optical upper limits
  45. GRB 121028A: Faulkes Telescope North observations
  46. GRB 121017A: Swift detection of a burst
  47. GRB 121011A: Swift-XRT refined Analysis
  48. GRB 121011A: MASTER-Net bell light curve
  49. Trigger 535733: Swift possible detection of SAX J1828.5-1037
  50. GRB 120927A: optical upper limit
  51. GRB 120927A: GROND upper limits
  52. GRB 120916A Suzaku WAM observation of the prompt emission
  53. GRB 120923A: EVLA Observations
  54. GRB 120922A: Swift detection of a burst
  55. IPN Triangulation of long GRB 120919B
  56. IPN Triangulation of long GRB 120919A
  57. GRB 120909A: Swift-BAT refined analysis
  58. GRB 120830A: Swift-XRT and UVOT observations
  59. GRB 120819A: MITSuME Ishigakijima upper limits
  60. GRB 120815A: Swift-BAT refined analysis
  61. GRB 120807A: Enhanced Swift-XRT position
  62. GRB 120807A: Swift detection of a burst
  63. Fermi/GBM detection of an SGR-like burst
  64. GRB 120728A: Fermi GBM observation
  65. GRB 120805A: Swift detection of a burst
  66. GRB 120804A: EVLA Detection
  67. GRB 120804A: Gemini-North observations
  68. GRB 120803B: MITSuME Akeno Optical upper limits
  69. GRB 120728B: Fermi GBM detection
  70. IPN Triangulation of GRB 120728B (long/intense)
  71. Swift Trigger 529076 is from Swift J1910.2-0546 and is not a GRB
  72. GRB 120728A: GROND observations
  73. GRB120711A: Planned XMM-Newton observation
  74. IPN Triangulation of unusual GRB 120716A
  75. IPN Triangulation of GRB 120707A
  76. GRB 120624B: mm detection at PdBI
  77. Fermi Gamma-ray Burst Monitor trigger 120628.973 is not a GRB
  78. IPN Triangulation of GRB 120624A (short/intense)
  79. Konus-Wind observation of GRB 120617A
  80. IPN Triangulation of GRB 120617A (short/intense)
  81. IPN Triangulation of GRB 120602A (long/very bright)
  82. GRB 120521C: Early Tautenburg limits
  83. GRB 120521B: Swift-XRT refined Analysis
  84. GRB 120510A: Swift XRT and UVOT observations
  85. GRB 120427A: MASTER follow up observations
  86. IPN Triangulation of GRB 120427A
  87. GRB 120328B: Pi of the Sky simultaneous upper limits
  88. GRB 120402A: Swift detection of a possible burst or noise
  89. GRB 120328A: MITSuME Ishigakijima Optical Upper Limits
  90. GRB 120326A: MITSuME Ishigakijima Optical Observation at 2 days afterthe burst
  91. GRB 120327A: MITSuME Ishigakijima Optical Upper Limits at 1 day afterthe burst
  92. GRB 120328B: Fermi-LAT Observations
  93. GRB 120328B: Fermi GBM detection
  94. long/intense GRB 120328B: MASTER follow up observations
  95. GRB 120326A: Bassano Bresciano Observatory further optical observations
  96. GRB 120316A : Suzaku WAM observation of the prompt emission
  97. GRB 120320A, the review of the sky area in plate archives
  98. IPN Triangulation of GRB 120316A
  99. GRB 120312A: Swift detection of a burst
  100. GRB 120305A: EVLA deep limit on a radio counterpart

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