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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. IPN Triangulation of GRB 130307A
  2. GRB 100424A: Keck host detection and VLT/X-shooter redshift
  3. Swift XRT RETRACTION of GRB 130310A afterglow detection
  4. GRB 130310A: optical observations
  5. Swift XRT observations of GRB 130310A
  6. GRB 130306A: Swift Detection of a Possible Afterglow
  7. GRB 130131B: host detection and redshift
  8. Konus-Wind observation of GRB 130310A
  9. IPN triangulation of GRB 130310A
  10. GRB 130310A: Fermi GBM detection
  11. GRB 130310A: Fermi-LAT detection and localization
  12. GRB 130131A: JCMT SCUBA-2 sub-mm observations
  13. GRB 130306A: MITSuME Ishigakijima upper limits
  14. GRB 130306A: Swift-BAT refined analysis
  15. IPN triangulation of GRB 130228A
  16. GRB 130305A BAT refined circular
  17. GRB 130305A: Further Swift-XRT Observations
  18. Konus-Wind observation of GRB 130306A
  19. GRB 130305A: Optical Observations
  20. GRB 111123A: Keck-I host detection and VLT/X-shooter redshift
  21. GRB 130305A: Gemini-North upper limit
  22. GRB 130307A: Fermi GBM detection
  23. GRB 130306A: Fermi GBM observation
  24. GRB 130306A: MASTER-Net pre-Swift alert observation
  25. GRB 130305A: Swift/UVOT Upper Limit
  26. GRB 130305A: RATIR Observations
  27. GRB 130306A: Swift detection of a burst
  28. GRB 130305A: P60 Observations
  29. GRB 100615A: HST host detection and X-shooter redshift
  30. GRB 130305A: Swift/XRT detection of the afterglow
  31. Konus-Wind observation of GRB 130305A
  32. GRB 130305A: Fermi GBM observation
  33. GRB 130305A: Fermi LAT Detection
  34. Fermi GBM trigger 130301.638 is not GRB
  35. GBM trigger 383712005 (GRB 130228A?) : Possible high-energy photon emission in Fermi/LAT data
  36. GRB 130305A found in ground analysis of Swift/BAT data
  37. GRB 121128A: optical observations in Mondy observatory
  38. GRB 121128A: optical upper limit in Maidanak observatory
  39. GRB 130216A: Swift/UVOT Upper Limit
  40. GRB 130219A: Suzaku WAM observation of the prompt emission
  41. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  42. Trigger 549841: Swift detection of SGR1806-20
  43. Konus-Wind observation of GRB 130219A
  44. GRB 130216B: Suzaku WAM observation of the prompt emission
  45. GRB 130216A: possible radio counterpart is steady field source
  46. GRB 130216A: Swift/XRT observations
  47. IPN Triangulation of GRB 130219A
  48. GRB 130215A: Suzaku WAM observation of the prompt emission
  49. GRB 130215A: PTF P48 optical detection
  50. GRB 130219A: Fermi GBM detection
  51. GRB 130216B: Swift/XRT observations
  52. GRB 130216A: Further Swift-BAT refined analysis
  53. GRB 130216B: MASTER-Net early observation
  54. GRB 130216A: MASTER-Net early observations
  55. GRB 130215A: Continued RATIR Optical and NIR Monitoring
  56. GRB 130216A: Fermi GBM observation
  57. GRB 130216B: Fermi GBM observation
  58. GRB 130216A: possible early detection at 15 GHz
  59. GRB 130216A: MITSuME Ishigakijima upper limits
  60. GRB 130216B BAT refined analysis
  61. GRB 130216B: P200 NIR Observations
  62. GRB 130216A: P200 NIR Observations
  63. GRB 130216A: Swift-BAT refined analysis
  64. GRB 130216A: TAROT La Silla observatory optical observations
  65. GRB 130215A: Additional P200 NIR observations
  66. GRB 130216B: Burst found in ground analysis of BAT data
  67. GRB 120118B: host observations and redshift determination
  68. GRB 130216A: OSN I-band observations
  69. GRB 130216A: Swift detection of a burst
  70. GRB 130215A: P200 NIR observations
  71. GRB 130215A: GROND Detection of the Optical/NIR Afterglow
  72. GRB 130215A: MITSuME Okayama Optical Observation
  73. GRB 130215A: Fermi GBM detection
  74. GRB 130215A: RAPTOR Measurements
  75. GRB 130215A: GMG optical observation
  76. GRB 130215A: iTelescope T11 observations
  77. GRB 130215A: Xinglong optical observations
  78. GRB 130215A: Swift-BAT refined analysis
  79. GRB 130215A: TAROT La Silla observatory optical observations
  80. GRB 130215A: RATIR Optical and NIR Observations
  81. GRB 130215A: REM NIR observations
  82. GRB 130215A: CARMA 3mm detection
  83. GRB 130215A: P60 Observations
  84. GRB 130215A: ROTSE-III data analysis
  85. GRB 130215A: Redshift estimate
  86. Skynet Observations of GRB130215
  87. GRB 130215: ROTSE-III Detection of Optical Counterpart
  88. GRB 130215A: Swift detection of a burst
  89. Swift GRB130206A: late XRT observations.
  90. GRB 130131B: CTIO 0.9-m optical upper-limits
  91. GRB 121128A: optical observations
  92. GRB 121123A: optical observations
  93. GRB 130211A: Swift/UVOT Upper Limits
  94. GRB 130211A: Swift-XRT refined Analysis
  95. GRB 130211A: Swift-BAT refined analysis
  96. GRB 130211A: GROND detection of the afterglow
  97. GRB 130211A: Swift detection of a burst
  98. GRB 130131A: MITSuME Akeno Optical upper limits
  99. GRB 130131B: MITSuME Akeno Optical upper limits
  100. GRB 130122A: PTF P48 optical upper limits

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