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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"

35437 results found.

  1. IPN triangulation of GRB010613
  2. IPN triangulation of GRB010612
  3. HETE Fully-Automated GCN Notices
  4. GRB000301C: Late-time HST/STIS observation
  5. GRB010518: a faint BeppoSAX detection
  6. GRB000418: HST/STIS Second-epoch Observations
  7. GRB010427, Gamma Ray Observations
  8. SGR1900+14
  9. GRB 010222 /corrections to VBT data
  10. Possible precursor to the SGR1900+14 giant burst
  11. IPN Triangulation of the Giant Flare from SGR1900+14
  12. GRB010412, field photometry
  13. GRB 010326b Optical Observations
  14. GRB010412: Optical observations
  15. GRB010412: Optical observations
  16. IPN Triangulation of GRB010412
  17. BeppoSAX GRB: extension of BSAX operations upto April 30, 2002
  18. BeppoSAX GRB ALERT: GRB010412
  19. GRB Observation Report
  20. GRB010324, revised field photometry
  21. REVISED LOCATION OF GRB010326A
  22. GRB 980326: Late-time HST/STIS observations
  23. GRB010324, field photometry
  24. GRB010326B, field photometry
  25. GRB010326, field photometry
  26. GRB010220, field photometry
  27. Further Optical Observations of GRB 010324
  28. GRB 010326A: Further optical observations
  29. GRB010324: BeppoSAX/GRBM data
  30. GRB 010326B: Optical observations
  31. GRB010324, optical observations
  32. GRB010326B: Localization by HETE (2nd GRB for this date)
  33. GRB 010326: Optical observations
  34. GRB 010326 optical observations
  35. GRB010326: Refined Localization by HETE
  36. GRB010326: Localization by HETE
  37. Duration, ECT, peak flux and fluence of GRB010324
  38. Optical Observations of GRB 010324
  39. IPN TRIANGULATION OF GRB010324
  40. GRB990705, VLT-FORS1 observations of the host galaxy
  41. GRB010222, late-time optical observation
  42. Support extension to the BeppoSAX mission
  43. GRB 010222 - HEGRA GeV/TeV Observations
  44. Congratulate Scott on the 1000th GRB Coordinates Network Circular!
  45. GRB010222: Chandra X-ray Observatory Observation
  46. GRB010222: Sub-millimeter vanishing act
  47. GRB 010222, Optical Observations
  48. GRB 010222: High-Resolution Keck Spectroscopy
  49. GRB 010214, I-band data
  50. Sub-millimeter Excess/GRB 010222
  51. GRB 010222
  52. GRB 010222 HST/Chandra TOO
  53. GRB 010222
  54. GRB010222 further R-band photometry
  55. GRB010222: R-band data
  56. GRB010222 Optical observations
  57. GRB 010222: Keck Spectroscopy
  58. GRB010214, field photometry
  59. GRB010222, field photometry
  60. GRB010222 further R-band photometry
  61. GRB010222, possible increase of optical decay slope
  62. GRB 010222 Kyoto optical observation
  63. GRB010222: fading behavior
  64. GRB 010222 BV optical observations
  65. GRB 010220: Near-IR Observations
  66. GRB010214 follow-up from Hanle
  67. GRB 010222: Near-IR Observations
  68. GRB 010222: Optical Observations
  69. GRB 010222, Decay Slope Confirmed
  70. GRB010222: Another absorption line system
  71. GRB010222: Optical decay slope
  72. GRB 010214, Optical Observations
  73. GRB010222: Sub-millimeter detection
  74. GRB010222: R-band fading behavior
  75. GRB010222: Optical Observations
  76. GRB010222, optical observations
  77. GRB010222: BeppoSAX/NFI Observations
  78. Redshift of the Optical Transient of GRB010222
  79. GRB010214B,Gamma Ray Observations
  80. GRB010222
  81. ALERT: GRB010222: the brightest GRB observed by BeppoSAX
  82. GRB 010220, simultaneous optical observations
  83. GRB010220: BeppoSAX WFC and GRBM preliminary data
  84. BeppoSAX ALERT: GRB010220
  85. GRB010214: BeppoSAX WFC and GRBM preliminary data
  86. GRB 010214: X-Ray afterglow
  87. GRB 010214, Optical Observations
  88. GRB 010214 optical observation
  89. GRB010213 Optical Observation
  90. J-Band Observation of GRB 010214.
  91. GRB010213, Near-IR observations
  92. Possible InfraRed Transient of GRB 010214.
  93. GRB010214 Optical Observation
  94. GRB010214: BeppoSAX/NFI Observations
  95. GRB010213 (HETE) TAROT observations
  96. GRB 010214, optical observations
  97. BeppoSAX ALERT: GRB010214
  98. IPN Status Report
  99. HETE Status
  100. GRB010126 opt. obs.

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