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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"

44623 results found.

  1. GRB010324: BeppoSAX/GRBM data
  2. GRB 010326B: Optical observations
  3. GRB010324, optical observations
  4. GRB010326B: Localization by HETE (2nd GRB for this date)
  5. GRB 010326: Optical observations
  6. GRB 010326 optical observations
  7. GRB010326: Refined Localization by HETE
  8. GRB010326: Localization by HETE
  9. Duration, ECT, peak flux and fluence of GRB010324
  10. Optical Observations of GRB 010324
  11. IPN TRIANGULATION OF GRB010324
  12. GRB990705, VLT-FORS1 observations of the host galaxy
  13. GRB010222, late-time optical observation
  14. Support extension to the BeppoSAX mission
  15. GRB 010222 - HEGRA GeV/TeV Observations
  16. Congratulate Scott on the 1000th GRB Coordinates Network Circular!
  17. GRB010222: Chandra X-ray Observatory Observation
  18. GRB010222: Sub-millimeter vanishing act
  19. GRB010222 - Optical observation
  20. GRB 010222, Optical Observations
  21. GRB010220 optical obsercations
  22. GRB010222 - Optical observation
  23. GRB 010222: High-Resolution Keck Spectroscopy
  24. GRB010222: Optical observation and decay
  25. GRB 010214, I-band data
  26. Sub-millimeter Excess/GRB 010222
  27. GRB 010222
  28. GRB 010222 HST/Chandra TOO
  29. GRB 010222
  30. GRB010222 further R-band photometry
  31. GRB010222: R-band data
  32. GRB010222 Optical observations
  33. GRB 010222: Keck Spectroscopy
  34. GRB010214, field photometry
  35. GRB010222, field photometry
  36. GRB010222 further R-band photometry
  37. GRB010222, possible increase of optical decay slope
  38. GRB 010222 Kyoto optical observation
  39. GRB010222: fading behavior
  40. GRB 010222 BV optical observations
  41. GRB010220, Optical Observations
  42. GRB010222 R-BAND OBSERVATION
  43. GRB 010220: Near-IR Observations
  44. GRB010214 follow-up from Hanle
  45. GRB 010222: Near-IR Observations
  46. GRB 010222: Optical Observations
  47. GRB 010222, Decay Slope Confirmed
  48. GRB010222: Another absorption line system
  49. GRB010222: Optical decay slope
  50. GRB 010214, Optical Observations
  51. GRB010222: Sub-millimeter detection
  52. GRB010222: R-band fading behavior
  53. GRB010222: Optical Observations
  54. GRB010222, radio observations
  55. GRB010222, optical observations
  56. GRB010222: BeppoSAX/NFI Observations
  57. Redshift of the Optical Transient of GRB010222
  58. GRB010214B,Gamma Ray Observations
  59. GRB010222: possible optical counterpart
  60. GRB010222
  61. GRB010222
  62. GRB010222: BeppoSAX refined position
  63. ALERT: GRB010222: the brightest GRB observed by BeppoSAX
  64. GRB010220, Radio and Optical Observations
  65. GRB 010220, simultaneous optical observations
  66. GRB010220: BeppoSAX WFC and GRBM preliminary data
  67. GRB010214, candidate optical afterglow
  68. GRB010214, optical observations
  69. BeppoSAX GRB010220: refined position
  70. BeppoSAX ALERT: GRB010220
  71. GRB010214: BeppoSAX WFC and GRBM preliminary data
  72. GRB 010214: X-Ray afterglow
  73. GRB 010214, Optical Observations
  74. GRB 010214 optical observation
  75. GRB010213, Radio Observations
  76. GRB010213 Optical Observation
  77. GRB010213, Radio Observations
  78. J-Band Observation of GRB 010214.
  79. GRB010214, Radio Observations
  80. GRB010214, optical observations
  81. GRB010213, optical observations
  82. GRB010213, Near-IR observations
  83. Possible InfraRed Transient of GRB 010214.
  84. GRB010214 Optical Observation
  85. GRB010214: BeppoSAX/NFI Observations
  86. GRB010213 (HETE) TAROT observations
  87. GRB 010214, optical observations
  88. GRB010213 detected by HETE
  89. GRB010214 refined WFC position
  90. BeppoSAX ALERT: GRB010214
  91. IPN Status Report
  92. HETE Status
  93. GRB010126 opt. obs.
  94. IPN/RXTE TRIANGULATION OF GRB010126
  95. GRB010126: CONCAM crude optical limits during GRB
  96. GRB010126, TNG R-band observations
  97. GRB010126 Optical Observations
  98. GRB010126 optical observations
  99. GRB010126: Optical observations
  100. IPN TRIANGULATION OF GRB010126

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