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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"

35362 results found.

  1. GRB010921 field photometry
  2. GRB010921 Optical Observations
  3. GRB 010921 DPOSS Images Available
  4. IPN triangulation of GRB010921 (=H1761)
  5. H1761: A Bright GRB Detected by HETE
  6. HETE Trigger #1760 (GRB 010920B?): new optical source = asteroid
  7. HETE Trigger #1760 (GRB 010920B?): a new optical source
  8. HETE Trigger #1759 (GRB 010920?) optical observations
  9. GRB001109, Host Galaxy Astrometry
  10. GRB000926, Host Galaxy Observations
  11. GRB001109, Host Galaxy Spectroscopic Observations
  12. Probable SGR or Short Duration GRB Detected by HETE
  13. GRB000926 Host Galaxy Observations
  14. GRB 010222: HST observations -- host galaxy and late-time decay
  15. BeppoSAX/GRBM detection of GRB 010801
  16. Dramatic Increase in the Rate of X-ray Bursts Reported by HETE
  17. GRB 010222 - WHT BVRI images
  18. GRB 010629 Optical Observations
  19. GRB010629: Optical Observations
  20. GRB010629, optical observations
  21. IPN triangulation of GRB010629
  22. GRB010629: A Burst Localized by HETE
  23. Possible burst from SGR1806-20
  24. IPN detection of SGR1900+14
  25. GRB 00630: Host Galaxy
  26. IPN triangulation of GRB010613
  27. IPN triangulation of GRB010612
  28. HETE Fully-Automated GCN Notices
  29. GRB000301C: Late-time HST/STIS observation
  30. GRB010518: a faint BeppoSAX detection
  31. GRB000418: HST/STIS Second-epoch Observations
  32. GRB010427, Gamma Ray Observations
  33. SGR1900+14
  34. GRB 010222 /corrections to VBT data
  35. Possible precursor to the SGR1900+14 giant burst
  36. IPN Triangulation of the Giant Flare from SGR1900+14
  37. GRB010412, field photometry
  38. GRB 010326b Optical Observations
  39. GRB010412: Optical observations
  40. GRB010412: Optical observations
  41. IPN Triangulation of GRB010412
  42. BeppoSAX GRB: extension of BSAX operations upto April 30, 2002
  43. BeppoSAX GRB ALERT: GRB010412
  44. GRB Observation Report
  45. GRB010324, revised field photometry
  46. REVISED LOCATION OF GRB010326A
  47. GRB 980326: Late-time HST/STIS observations
  48. GRB010324, field photometry
  49. GRB010326B, field photometry
  50. GRB010326, field photometry
  51. GRB010220, field photometry
  52. Further Optical Observations of GRB 010324
  53. GRB 010326A: Further optical observations
  54. GRB010324: BeppoSAX/GRBM data
  55. GRB 010326B: Optical observations
  56. GRB010324, optical observations
  57. GRB010326B: Localization by HETE (2nd GRB for this date)
  58. GRB 010326: Optical observations
  59. GRB 010326 optical observations
  60. GRB010326: Refined Localization by HETE
  61. GRB010326: Localization by HETE
  62. Duration, ECT, peak flux and fluence of GRB010324
  63. Optical Observations of GRB 010324
  64. IPN TRIANGULATION OF GRB010324
  65. GRB990705, VLT-FORS1 observations of the host galaxy
  66. GRB010222, late-time optical observation
  67. Support extension to the BeppoSAX mission
  68. GRB 010222 - HEGRA GeV/TeV Observations
  69. Congratulate Scott on the 1000th GRB Coordinates Network Circular!
  70. GRB010222: Chandra X-ray Observatory Observation
  71. GRB010222: Sub-millimeter vanishing act
  72. GRB 010222, Optical Observations
  73. GRB 010222: High-Resolution Keck Spectroscopy
  74. GRB 010214, I-band data
  75. Sub-millimeter Excess/GRB 010222
  76. GRB 010222
  77. GRB 010222 HST/Chandra TOO
  78. GRB 010222
  79. GRB010222 further R-band photometry
  80. GRB010222: R-band data
  81. GRB010222 Optical observations
  82. GRB 010222: Keck Spectroscopy
  83. GRB010214, field photometry
  84. GRB010222, field photometry
  85. GRB010222 further R-band photometry
  86. GRB010222, possible increase of optical decay slope
  87. GRB 010222 Kyoto optical observation
  88. GRB010222: fading behavior
  89. GRB 010222 BV optical observations
  90. GRB 010220: Near-IR Observations
  91. GRB010214 follow-up from Hanle
  92. GRB 010222: Near-IR Observations
  93. GRB 010222: Optical Observations
  94. GRB 010222, Decay Slope Confirmed
  95. GRB010222: Another absorption line system
  96. GRB010222: Optical decay slope
  97. GRB 010214, Optical Observations
  98. GRB010222: Sub-millimeter detection
  99. GRB010222: R-band fading behavior
  100. GRB010222: Optical Observations

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