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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"

36146 results found.

  1. GRB 010222 - WHT BVRI images
  2. GRB 010629 Optical Observations
  3. GRB010629: Optical Observations
  4. GRB010629, optical observations
  5. IPN triangulation of GRB010629
  6. GRB010629: A Burst Localized by HETE
  7. Possible burst from SGR1806-20
  8. IPN detection of SGR1900+14
  9. GRB 00630: Host Galaxy
  10. IPN triangulation of GRB010613
  11. IPN triangulation of GRB010612
  12. HETE Fully-Automated GCN Notices
  13. GRB000301C: Late-time HST/STIS observation
  14. GRB010518: a faint BeppoSAX detection
  15. GRB000418: HST/STIS Second-epoch Observations
  16. GRB010427, Gamma Ray Observations
  17. SGR1900+14
  18. GRB 010222 /corrections to VBT data
  19. Possible precursor to the SGR1900+14 giant burst
  20. IPN Triangulation of the Giant Flare from SGR1900+14
  21. GRB010412, field photometry
  22. GRB 010326b Optical Observations
  23. GRB010412: Optical observations
  24. GRB010412: Optical observations
  25. IPN Triangulation of GRB010412
  26. BeppoSAX GRB: extension of BSAX operations upto April 30, 2002
  27. BeppoSAX GRB ALERT: GRB010412
  28. GRB Observation Report
  29. GRB010324, revised field photometry
  30. REVISED LOCATION OF GRB010326A
  31. GRB 980326: Late-time HST/STIS observations
  32. GRB010324, field photometry
  33. GRB010326B, field photometry
  34. GRB010326, field photometry
  35. GRB010220, field photometry
  36. Further Optical Observations of GRB 010324
  37. GRB 010326A: Further optical observations
  38. GRB010324: BeppoSAX/GRBM data
  39. GRB 010326B: Optical observations
  40. GRB010324, optical observations
  41. GRB010326B: Localization by HETE (2nd GRB for this date)
  42. GRB 010326: Optical observations
  43. GRB 010326 optical observations
  44. GRB010326: Refined Localization by HETE
  45. GRB010326: Localization by HETE
  46. Duration, ECT, peak flux and fluence of GRB010324
  47. Optical Observations of GRB 010324
  48. IPN TRIANGULATION OF GRB010324
  49. GRB990705, VLT-FORS1 observations of the host galaxy
  50. GRB010222, late-time optical observation
  51. Support extension to the BeppoSAX mission
  52. GRB 010222 - HEGRA GeV/TeV Observations
  53. Congratulate Scott on the 1000th GRB Coordinates Network Circular!
  54. GRB010222: Chandra X-ray Observatory Observation
  55. GRB010222: Sub-millimeter vanishing act
  56. GRB 010222, Optical Observations
  57. GRB 010222: High-Resolution Keck Spectroscopy
  58. GRB 010214, I-band data
  59. Sub-millimeter Excess/GRB 010222
  60. GRB 010222
  61. GRB 010222 HST/Chandra TOO
  62. GRB 010222
  63. GRB010222 further R-band photometry
  64. GRB010222: R-band data
  65. GRB010222 Optical observations
  66. GRB 010222: Keck Spectroscopy
  67. GRB010214, field photometry
  68. GRB010222, field photometry
  69. GRB010222 further R-band photometry
  70. GRB010222, possible increase of optical decay slope
  71. GRB 010222 Kyoto optical observation
  72. GRB010222: fading behavior
  73. GRB 010222 BV optical observations
  74. GRB 010220: Near-IR Observations
  75. GRB010214 follow-up from Hanle
  76. GRB 010222: Near-IR Observations
  77. GRB 010222: Optical Observations
  78. GRB 010222, Decay Slope Confirmed
  79. GRB010222: Another absorption line system
  80. GRB010222: Optical decay slope
  81. GRB 010214, Optical Observations
  82. GRB010222: Sub-millimeter detection
  83. GRB010222: R-band fading behavior
  84. GRB010222: Optical Observations
  85. GRB010222, optical observations
  86. GRB010222: BeppoSAX/NFI Observations
  87. Redshift of the Optical Transient of GRB010222
  88. GRB010214B,Gamma Ray Observations
  89. GRB010222
  90. ALERT: GRB010222: the brightest GRB observed by BeppoSAX
  91. GRB 010220, simultaneous optical observations
  92. GRB010220: BeppoSAX WFC and GRBM preliminary data
  93. BeppoSAX ALERT: GRB010220
  94. GRB010214: BeppoSAX WFC and GRBM preliminary data
  95. GRB 010214: X-Ray afterglow
  96. GRB 010214, Optical Observations
  97. GRB 010214 optical observation
  98. GRB010213 Optical Observation
  99. J-Band Observation of GRB 010214.
  100. GRB010213, Near-IR observations

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