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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"
  1. GRB 130131B: host detection and redshift
  2. Konus-Wind observation of GRB 130310A
  3. IPN triangulation of GRB 130310A
  4. GRB 130310A: Fermi GBM detection
  5. GRB 130310A: Fermi-LAT detection and localization
  6. GRB 130131A: JCMT SCUBA-2 sub-mm observations
  7. GRB 130306A: MITSuME Ishigakijima upper limits
  8. GRB 130306A: Swift-BAT refined analysis
  9. IPN triangulation of GRB 130228A
  10. GRB 130305A BAT refined circular
  11. GRB 130305A: Further Swift-XRT Observations
  12. Konus-Wind observation of GRB 130306A
  13. GRB 130305A: Optical Observations
  14. GRB 111123A: Keck-I host detection and VLT/X-shooter redshift
  15. GRB 130305A: Gemini-North upper limit
  16. GRB 130307A: Fermi GBM detection
  17. GRB 130306A: Fermi GBM observation
  18. GRB 130306A: MASTER-Net pre-Swift alert observation
  19. GRB 130305A: Swift/UVOT Upper Limit
  20. GRB 130305A: RATIR Observations
  21. GRB 130306A: Swift detection of a burst
  22. GRB 130305A: P60 Observations
  23. GRB 100615A: HST host detection and X-shooter redshift
  24. GRB 130305A: Swift/XRT detection of the afterglow
  25. Konus-Wind observation of GRB 130305A
  26. GRB 130305A: Fermi GBM observation
  27. GRB 130305A: Fermi LAT Detection
  28. Fermi GBM trigger 130301.638 is not GRB
  29. GBM trigger 383712005 (GRB 130228A?) : Possible high-energy photon emission in Fermi/LAT data
  30. GRB 130305A found in ground analysis of Swift/BAT data
  31. GRB 121128A: optical observations in Mondy observatory
  32. GRB 121128A: optical upper limit in Maidanak observatory
  33. GRB 130216A: Swift/UVOT Upper Limit
  34. GRB 130219A: Suzaku WAM observation of the prompt emission
  35. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  36. Trigger 549841: Swift detection of SGR1806-20
  37. Konus-Wind observation of GRB 130219A
  38. GRB 130216B: Suzaku WAM observation of the prompt emission
  39. GRB 130216A: possible radio counterpart is steady field source
  40. GRB 130216A: Swift/XRT observations
  41. IPN Triangulation of GRB 130219A
  42. GRB 130215A: Suzaku WAM observation of the prompt emission
  43. GRB 130215A: PTF P48 optical detection
  44. GRB 130219A: Fermi GBM detection
  45. GRB 130216B: Swift/XRT observations
  46. GRB 130216A: Further Swift-BAT refined analysis
  47. GRB 130216B: MASTER-Net early observation
  48. GRB 130216A: MASTER-Net early observations
  49. GRB 130215A: Continued RATIR Optical and NIR Monitoring
  50. GRB 130216A: Fermi GBM observation
  51. GRB 130216B: Fermi GBM observation
  52. GRB 130216A: possible early detection at 15 GHz
  53. GRB 130216A: MITSuME Ishigakijima upper limits
  54. GRB 130216B BAT refined analysis
  55. GRB 130216B: P200 NIR Observations
  56. GRB 130216A: P200 NIR Observations
  57. GRB 130216A: Swift-BAT refined analysis
  58. GRB 130216A: TAROT La Silla observatory optical observations
  59. GRB 130215A: Additional P200 NIR observations
  60. GRB 130216B: Burst found in ground analysis of BAT data
  61. GRB 120118B: host observations and redshift determination
  62. GRB 130216A: OSN I-band observations
  63. GRB 130216A: Swift detection of a burst
  64. GRB 130215A: P200 NIR observations
  65. GRB 130215A: GROND Detection of the Optical/NIR Afterglow
  66. GRB 130215A: MITSuME Okayama Optical Observation
  67. GRB 130215A: Fermi GBM detection
  68. GRB 130215A: RAPTOR Measurements
  69. GRB 130215A: GMG optical observation
  70. GRB 130215A: iTelescope T11 observations
  71. GRB 130215A: Xinglong optical observations
  72. GRB 130215A: Swift-BAT refined analysis
  73. GRB 130215A: TAROT La Silla observatory optical observations
  74. GRB 130215A: RATIR Optical and NIR Observations
  75. GRB 130215A: REM NIR observations
  76. GRB 130215A: CARMA 3mm detection
  77. GRB 130215A: P60 Observations
  78. GRB 130215A: ROTSE-III data analysis
  79. GRB 130215A: Redshift estimate
  80. Skynet Observations of GRB130215
  81. GRB 130215: ROTSE-III Detection of Optical Counterpart
  82. GRB 130215A: Swift detection of a burst
  83. Swift GRB130206A: late XRT observations.
  84. GRB 130131B: CTIO 0.9-m optical upper-limits
  85. GRB 121128A: optical observations
  86. GRB 121123A: optical observations
  87. GRB 130211A: Swift/UVOT Upper Limits
  88. GRB 130211A: Swift-XRT refined Analysis
  89. GRB 130211A: Swift-BAT refined analysis
  90. GRB 130211A: GROND detection of the afterglow
  91. GRB 130211A: Swift detection of a burst
  92. GRB 130131A: MITSuME Akeno Optical upper limits
  93. GRB 130131B: MITSuME Akeno Optical upper limits
  94. GRB 130122A: PTF P48 optical upper limits
  95. GRB 130206A: GROND Observations
  96. GRB 130206A: Fermi LAT Observations
  97. GRB 130206A: Fermi GBM observation
  98. GRB 130206A: XRT and UVOT follow-up observations.
  99. GRB 130131B: optical upper limit in Mondy observatory
  100. GRB 130206A, Swift-BAT refined analysis

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