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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"

36143 results found.

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

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