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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"

42779 results found.

  1. Possible precursor to the SGR1900+14 giant burst
  2. SGR1900+14, I-band observations
  3. IPN Triangulation of the Giant Flare from SGR1900+14
  4. GRB010412, field photometry
  5. Giant flare from SGR1900+14
  6. GRB 010326b Optical Observations
  7. GRB010412: Optical observations
  8. GRB010412: Optical observations
  9. GRB010412: BeppoSAX GRBM and WFC observations
  10. IPN Triangulation of GRB010412
  11. BeppoSAX GRB ALERT: GRB010412
  12. GRB010324, revised field photometry
  13. REVISED LOCATION OF GRB010326A
  14. GRB 980326: Late-time HST/STIS observations
  15. GRB010324, field photometry
  16. GRB010326B, field photometry
  17. GRB010326, field photometry
  18. GRB010220, field photometry
  19. Further Optical Observations of GRB 010324
  20. GRB010222, CXO X-ray observations
  21. GRB 010326A: Further optical observations
  22. GRB010324: BeppoSAX/GRBM data
  23. GRB 010326B: Optical observations
  24. GRB010324, optical observations
  25. GRB010326B: Localization by HETE (2nd GRB for this date)
  26. GRB 010326: Optical observations
  27. GRB 010326 optical observations
  28. GRB010326: Refined Localization by HETE
  29. GRB010326: Localization by HETE
  30. Duration, ECT, peak flux and fluence of GRB010324
  31. Optical Observations of GRB 010324
  32. IPN TRIANGULATION OF GRB010324
  33. GRB010222, late-time optical observation
  34. Support extension to the BeppoSAX mission
  35. GRB 010222 - HEGRA GeV/TeV Observations
  36. Congratulate Scott on the 1000th GRB Coordinates Network Circular!
  37. GRB010222: Chandra X-ray Observatory Observation
  38. GRB010222: Sub-millimeter vanishing act
  39. GRB010222 - Optical observation
  40. GRB 010222, Optical Observations
  41. GRB010220 optical obsercations
  42. GRB010222 - Optical observation
  43. GRB 010222: High-Resolution Keck Spectroscopy
  44. GRB010222: Optical observation and decay
  45. GRB 010214, I-band data
  46. Sub-millimeter Excess/GRB 010222
  47. GRB 010222
  48. GRB 010222 HST/Chandra TOO
  49. GRB 010222
  50. GRB010222 further R-band photometry
  51. GRB010222: R-band data
  52. GRB010222 Optical observations
  53. GRB 010222: Keck Spectroscopy
  54. GRB010214, field photometry
  55. GRB010222, field photometry
  56. GRB010222 further R-band photometry
  57. GRB010222, possible increase of optical decay slope
  58. GRB 010222 Kyoto optical observation
  59. GRB010222: fading behavior
  60. GRB 010222 BV optical observations
  61. GRB010220, Optical Observations
  62. GRB010222 R-BAND OBSERVATION
  63. GRB 010220: Near-IR Observations
  64. GRB010214 follow-up from Hanle
  65. GRB 010222: Near-IR Observations
  66. GRB 010222: Optical Observations
  67. GRB 010222, Decay Slope Confirmed
  68. GRB010222: Another absorption line system
  69. GRB010222: Optical decay slope
  70. GRB010222: Sub-millimeter detection
  71. GRB010222: R-band fading behavior
  72. GRB010222: Optical Observations
  73. GRB010222, radio observations
  74. GRB010222, optical observations
  75. GRB010222: BeppoSAX/NFI Observations
  76. Redshift of the Optical Transient of GRB010222
  77. GRB010214B,Gamma Ray Observations
  78. GRB010222: possible optical counterpart
  79. ALERT: GRB010222: the brightest GRB observed by BeppoSAX
  80. GRB010220, Radio and Optical Observations
  81. GRB 010220, simultaneous optical observations
  82. GRB010220: BeppoSAX WFC and GRBM preliminary data
  83. GRB010214, candidate optical afterglow
  84. GRB010214, optical observations
  85. BeppoSAX ALERT: GRB010220
  86. GRB010214: BeppoSAX WFC and GRBM preliminary data
  87. GRB 010214: X-Ray afterglow
  88. GRB 010214, Optical Observations
  89. GRB 010214 optical observation
  90. GRB010213, Radio Observations
  91. GRB010213 Optical Observation
  92. GRB010213, Radio Observations
  93. J-Band Observation of GRB 010214.
  94. GRB010214, Radio Observations
  95. GRB010214, optical observations
  96. GRB010213, optical observations
  97. GRB010213, Near-IR observations
  98. Possible InfraRed Transient of GRB 010214.
  99. GRB010214 Optical Observation
  100. GRB010213 (HETE) TAROT observations

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