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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"

18339 results found.

  1. GRB010629, optical observations
  2. GRB010629: A Burst Localized by HETE
  3. SGR1900+14: Second Burst Localized by HETE
  4. SGR1900+14: A Burst Localized by HETE
  5. SGR1806-20: A Second, Intense Burst Localized by HETE
  6. SGR1806-20: Localization by HETE
  7. HETE Fully-Automated GCN Notices
  8. GRB000301C: Late-time HST/STIS observation
  9. GRB010518: a faint BeppoSAX detection
  10. GRB000418: HST/STIS Second-epoch Observations
  11. X-ray precursors to the large flare from SGR 1900+14
  12. GRB010427, Gamma Ray Observations
  13. BeppoSAX/NFI Follow-up Observation of SGR 1900+14
  14. Millimeter observation of SGR 1900+14
  15. SGR1900+14, I-band observations
  16. GRB010412, field photometry
  17. Giant flare from SGR1900+14
  18. GRB 010326b Optical Observations
  19. GRB010412: BeppoSAX GRBM and WFC observations
  20. GRB010324, revised field photometry
  21. GRB 980326: Late-time HST/STIS observations
  22. GRB010324, field photometry
  23. GRB010326B, field photometry
  24. GRB010326, field photometry
  25. GRB010220, field photometry
  26. Further Optical Observations of GRB 010324
  27. GRB010222, CXO X-ray observations
  28. GRB010324: BeppoSAX/GRBM data
  29. GRB010324, optical observations
  30. GRB010326B: Localization by HETE (2nd GRB for this date)
  31. GRB 010326 optical observations
  32. GRB010326: Refined Localization by HETE
  33. GRB010326: Localization by HETE
  34. Optical Observations of GRB 010324
  35. IPN TRIANGULATION OF GRB010324
  36. GRB010222, late-time optical observation
  37. Support extension to the BeppoSAX mission
  38. GRB 010222, Optical Observations
  39. GRB010220 optical obsercations
  40. GRB010222 - Optical observation
  41. GRB010222 further R-band photometry
  42. GRB 010222: Keck Spectroscopy
  43. GRB010214, field photometry
  44. GRB010222, field photometry
  45. GRB010222 further R-band photometry
  46. GRB 010222 Kyoto optical observation
  47. GRB010222 R-BAND OBSERVATION
  48. GRB010214 follow-up from Hanle
  49. GRB 010222: Near-IR Observations
  50. GRB 010222: Optical Observations
  51. GRB 010222, Decay Slope Confirmed
  52. GRB010222, radio observations
  53. GRB010222, optical observations
  54. GRB 010220, simultaneous optical observations
  55. GRB010220: BeppoSAX WFC and GRBM preliminary data
  56. GRB010214, optical observations
  57. GRB010214: BeppoSAX WFC and GRBM preliminary data
  58. GRB 010214: X-Ray afterglow
  59. GRB 010214 optical observation
  60. J-Band Observation of GRB 010214.
  61. GRB010214, optical observations
  62. GRB010213, optical observations
  63. GRB010213, Near-IR observations
  64. Possible InfraRed Transient of GRB 010214.
  65. GRB010214 Optical Observation
  66. GRB010213 detected by HETE
  67. HETE Status
  68. Optical Observations of GRB 001018 at Keck
  69. Optical observations of GRB 001018 with JCAM
  70. IPN TRIANGULATION OF GRB010109
  71. IPN triangulation of GRB010104
  72. IPN triangulation of GRB010103
  73. IPN triangulation of GRB001219
  74. GRB 001212 Optical Observation
  75. GRB 001212 Optical Observation
  76. GRB001120, optical observations
  77. GRB 001109: deep JHK upper limits
  78. GRB 001109 X-ray afterglow with BeppoSAX
  79. CORRECTION to XMM-Newton observation of GRB001025
  80. GRB001109, Radio observations
  81. GRB001105 BVRI field photometry correction
  82. GRB001105, BVRI field photometry
  83. GRB 001025B, Optical obervations
  84. GRB 991208: HST Imaging of the Host Galaxy
  85. GRB 001025B, I-band observations
  86. GRB 001025A, optical observation
  87. IPN TRIANGULATION OF GRB001025B (SHORT/HARD)
  88. GRB001007: Optical observations
  89. GRB001007, Radio observations
  90. IPN TRIANGULATION OF GRB001020
  91. CORRECTION TO PEAK FLUX OF GRB001018
  92. IPN TRIANGULATION OF GRB 001017
  93. V,R,I band observations of GRB000926
  94. GRB000926 - Amateur Optical Observations
  95. CONCAM null result on GRB001005
  96. GRB000926 - Optical observations
  97. GRB000926 - Optical observations
  98. GRB 000926, Optical Observations
  99. GRB000926 K'-band Observation
  100. J and K band observations of GRB 000926

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