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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"

35438 results found.

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

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