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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"

35431 results found.

  1. GRB010427, Gamma Ray Observations
  2. SGR1900+14
  3. GRB 010222 /corrections to VBT data
  4. Possible precursor to the SGR1900+14 giant burst
  5. IPN Triangulation of the Giant Flare from SGR1900+14
  6. GRB010412, field photometry
  7. GRB 010326b Optical Observations
  8. GRB010412: Optical observations
  9. GRB010412: Optical observations
  10. IPN Triangulation of GRB010412
  11. BeppoSAX GRB: extension of BSAX operations upto April 30, 2002
  12. BeppoSAX GRB ALERT: GRB010412
  13. GRB Observation Report
  14. GRB010324, revised field photometry
  15. REVISED LOCATION OF GRB010326A
  16. GRB 980326: Late-time HST/STIS observations
  17. GRB010324, field photometry
  18. GRB010326B, field photometry
  19. GRB010326, field photometry
  20. GRB010220, field photometry
  21. Further Optical Observations of GRB 010324
  22. GRB 010326A: Further optical observations
  23. GRB010324: BeppoSAX/GRBM data
  24. GRB 010326B: Optical observations
  25. GRB010324, optical observations
  26. GRB010326B: Localization by HETE (2nd GRB for this date)
  27. GRB 010326: Optical observations
  28. GRB 010326 optical observations
  29. GRB010326: Refined Localization by HETE
  30. GRB010326: Localization by HETE
  31. Duration, ECT, peak flux and fluence of GRB010324
  32. Optical Observations of GRB 010324
  33. IPN TRIANGULATION OF GRB010324
  34. GRB990705, VLT-FORS1 observations of the host galaxy
  35. GRB010222, late-time optical observation
  36. Support extension to the BeppoSAX mission
  37. GRB 010222 - HEGRA GeV/TeV Observations
  38. Congratulate Scott on the 1000th GRB Coordinates Network Circular!
  39. GRB010222: Chandra X-ray Observatory Observation
  40. GRB010222: Sub-millimeter vanishing act
  41. GRB 010222, Optical Observations
  42. GRB 010222: High-Resolution Keck Spectroscopy
  43. GRB 010214, I-band data
  44. Sub-millimeter Excess/GRB 010222
  45. GRB 010222
  46. GRB 010222 HST/Chandra TOO
  47. GRB 010222
  48. GRB010222 further R-band photometry
  49. GRB010222: R-band data
  50. GRB010222 Optical observations
  51. GRB 010222: Keck Spectroscopy
  52. GRB010214, field photometry
  53. GRB010222, field photometry
  54. GRB010222 further R-band photometry
  55. GRB010222, possible increase of optical decay slope
  56. GRB 010222 Kyoto optical observation
  57. GRB010222: fading behavior
  58. GRB 010222 BV optical observations
  59. GRB 010220: Near-IR Observations
  60. GRB010214 follow-up from Hanle
  61. GRB 010222: Near-IR Observations
  62. GRB 010222: Optical Observations
  63. GRB 010222, Decay Slope Confirmed
  64. GRB010222: Another absorption line system
  65. GRB010222: Optical decay slope
  66. GRB 010214, Optical Observations
  67. GRB010222: Sub-millimeter detection
  68. GRB010222: R-band fading behavior
  69. GRB010222: Optical Observations
  70. GRB010222, optical observations
  71. GRB010222: BeppoSAX/NFI Observations
  72. Redshift of the Optical Transient of GRB010222
  73. GRB010214B,Gamma Ray Observations
  74. GRB010222
  75. ALERT: GRB010222: the brightest GRB observed by BeppoSAX
  76. GRB 010220, simultaneous optical observations
  77. GRB010220: BeppoSAX WFC and GRBM preliminary data
  78. BeppoSAX ALERT: GRB010220
  79. GRB010214: BeppoSAX WFC and GRBM preliminary data
  80. GRB 010214: X-Ray afterglow
  81. GRB 010214, Optical Observations
  82. GRB 010214 optical observation
  83. GRB010213 Optical Observation
  84. J-Band Observation of GRB 010214.
  85. GRB010213, Near-IR observations
  86. Possible InfraRed Transient of GRB 010214.
  87. GRB010214 Optical Observation
  88. GRB010214: BeppoSAX/NFI Observations
  89. GRB010213 (HETE) TAROT observations
  90. GRB 010214, optical observations
  91. BeppoSAX ALERT: GRB010214
  92. IPN Status Report
  93. HETE Status
  94. GRB010126 opt. obs.
  95. IPN/RXTE TRIANGULATION OF GRB010126
  96. GRB010126: CONCAM crude optical limits during GRB
  97. GRB010126, TNG R-band observations
  98. IPN TRIANGULATION OF GRB010126
  99. IPN/RXTE TRIANGULATION OF GRB010126
  100. GRB 010119, optical observations

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