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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"

45431 results found.

  1. GRB 130313A: Swift-XRT refined Analysis
  2. GRB 130313A: simultaneous and follow-up optical observations at BOOTES-3 and BOOTES-4
  3. GRB 130313A: Weihai optical upper limit
  4. GRB 130313A: Swift-XRT detection of a possible X-ray afterglow
  5. GRB 130313A: Swift-BAT refined analysis
  6. GRB 130313A: Zadko observatory - Gingin optical observations
  7. GRB 130313A: MASTER-Net optical observations
  8. GRB 130313A: Swift detection of a short burst
  9. IPN Triangulation of GRB 130307A
  10. GRB 100424A: Keck host detection and VLT/X-shooter redshift
  11. Swift XRT RETRACTION of GRB 130310A afterglow detection
  12. GRB 130310A: optical observations
  13. Swift XRT observations of GRB 130310A
  14. GRB 130306A: Swift Detection of a Possible Afterglow
  15. GRB 130131B: host detection and redshift
  16. Konus-Wind observation of GRB 130310A
  17. IPN triangulation of GRB 130310A
  18. GRB 130310A: Fermi GBM detection
  19. GRB 130310A: Fermi-LAT detection and localization
  20. GRB 130131A: JCMT SCUBA-2 sub-mm observations
  21. GRB 130306A: MITSuME Ishigakijima upper limits
  22. GRB 130306A: Swift-BAT refined analysis
  23. IPN triangulation of GRB 130228A
  24. GRB 130305A BAT refined circular
  25. GRB 130305A: Further Swift-XRT Observations
  26. Konus-Wind observation of GRB 130306A
  27. GRB 130305A: Optical Observations
  28. GRB 111123A: Keck-I host detection and VLT/X-shooter redshift
  29. GRB 130305A: Gemini-North upper limit
  30. GRB 130307A: Fermi GBM detection
  31. GRB 130306A: Fermi GBM observation
  32. GRB 130306A: MASTER-Net pre-Swift alert observation
  33. GRB 130305A: Swift/UVOT Upper Limit
  34. GRB 130305A: RATIR Observations
  35. GRB 130306A: Swift detection of a burst
  36. GRB 130305A: P60 Observations
  37. GRB 100615A: HST host detection and X-shooter redshift
  38. GRB 130305A: Swift/XRT detection of the afterglow
  39. Konus-Wind observation of GRB 130305A
  40. GRB 130305A: Fermi GBM observation
  41. GRB 130305A: Fermi LAT Detection
  42. Fermi GBM trigger 130301.638 is not GRB
  43. GBM trigger 383712005 (GRB 130228A?) : Possible high-energy photon emission in Fermi/LAT data
  44. GRB 130305A found in ground analysis of Swift/BAT data
  45. GRB 121128A: optical observations in Mondy observatory
  46. GRB 121128A: optical upper limit in Maidanak observatory
  47. GRB 130216A: Swift/UVOT Upper Limit
  48. GRB 130219A: Suzaku WAM observation of the prompt emission
  49. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  50. Trigger 549841: Swift detection of SGR1806-20
  51. Konus-Wind observation of GRB 130219A
  52. GRB 130216B: Suzaku WAM observation of the prompt emission
  53. GRB 130216A: possible radio counterpart is steady field source
  54. GRB 130216A: Swift/XRT observations
  55. IPN Triangulation of GRB 130219A
  56. GRB 130215A: Suzaku WAM observation of the prompt emission
  57. GRB 130215A: PTF P48 optical detection
  58. GRB 130219A: Fermi GBM detection
  59. GRB 130216B: Swift/XRT observations
  60. GRB 130216A: Further Swift-BAT refined analysis
  61. GRB 130216B: MASTER-Net early observation
  62. GRB 130216A: MASTER-Net early observations
  63. GRB 130215A: Continued RATIR Optical and NIR Monitoring
  64. GRB 130216A: Fermi GBM observation
  65. GRB 130216B: Fermi GBM observation
  66. GRB 130216A: possible early detection at 15 GHz
  67. GRB 130216A: MITSuME Ishigakijima upper limits
  68. GRB 130216B BAT refined analysis
  69. GRB 130216B: P200 NIR Observations
  70. GRB 130216A: P200 NIR Observations
  71. GRB 130216A: Swift-BAT refined analysis
  72. GRB 130216A: TAROT La Silla observatory optical observations
  73. GRB 130215A: Additional P200 NIR observations
  74. GRB 130216B: Burst found in ground analysis of BAT data
  75. GRB 120118B: host observations and redshift determination
  76. GRB 130216A: OSN I-band observations
  77. GRB 130216A: Swift detection of a burst
  78. GRB 130215A: P200 NIR observations
  79. GRB 130215A: GROND Detection of the Optical/NIR Afterglow
  80. GRB 130215A: MITSuME Okayama Optical Observation
  81. GRB 130215A: Fermi GBM detection
  82. GRB 130215A: RAPTOR Measurements
  83. GRB 130215A: GMG optical observation
  84. GRB 130215A: Xinglong optical observations
  85. GRB 130215A: Swift-BAT refined analysis
  86. GRB 130215A: TAROT La Silla observatory optical observations
  87. GRB 130215A: RATIR Optical and NIR Observations
  88. GRB 130215A: REM NIR observations
  89. GRB 130215A: CARMA 3mm detection
  90. GRB 130215A: P60 Observations
  91. GRB 130215A: ROTSE-III data analysis
  92. GRB 130215A: Redshift estimate
  93. Skynet Observations of GRB130215
  94. GRB 130215: ROTSE-III Detection of Optical Counterpart
  95. GRB 130215A: Swift detection of a burst
  96. Swift GRB130206A: late XRT observations.
  97. GRB 130131B: CTIO 0.9-m optical upper-limits
  98. GRB 121128A: optical observations
  99. GRB 121123A: optical observations
  100. GRB 130211A: Swift/UVOT Upper Limits

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