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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

36142 results found.

  1. GRB 021112, Radio Observations
  2. GRB021112, BVRI field photometry
  3. GRB 021112: Variable Source in R-band search
  4. GRB021112: Optical Observations
  5. GRB021113: Kiso Observations
  6. IPN triangulation of GRB021109 (portion of annulus)
  7. IPN triangulation of GRB021113 (=H2449; annulus)
  8. IPN triangulation of GRB021108 (CORRECTION; TWO LARGE ERROR BOXES)
  9. GRB 021113: Optical observations
  10. GRB 021112: RAPTOR Observations
  11. GRB 021113: Optical Observations
  12. GRB 021113: Optical Observations
  13. GRB021113 (=H2449): A Long GRB Localized by HETE
  14. GRB 021112: Optical Observations
  15. GRB 021112: R-band search
  16. IPN triangulation of GRB021108 (large error box)
  17. GRB021112 (=H2448): A Long GRB Localized by HETE
  18. GRB 021016: Optical Observations
  19. IPN triangulation of GRB021109 (annulus)
  20. IPN triangulation of GRB021108 (annulus)
  21. IPN triangulation of GRB021104 (annulus)
  22. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  23. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  24. SGR1900+14 activity, November 2-4, 2002
  25. GRB021104: Candidate present in DSS
  26. IPN triangulation of GRB021102 (annulus)
  27. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  28. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  29. IPN triangulation of GRB021025 (portion of annulus)
  30. IPN triangulation of GRB021027 (single large error box)
  31. GRB021004, late-time optical observations
  32. IPN triangulation of GRB021027 (two large error boxes)
  33. GRB 021023: Infrared Imaging
  34. IPN triangulation of GRB021027 (annulus)
  35. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  36. IPN triangulation of GRB021025 (annulus)
  37. IPN triangulation of SGR1900+14, October 22 2002
  38. GRB 021004: optical observations
  39. IPN triangulation of GRB021023 (small error boc)
  40. GRB 020813; likely host galaxy.
  41. IPN triangulation of GRB021020 (smaller error box)
  42. IPN triangulation of GRB021020
  43. GRB 021008, radio observations
  44. GRB 021016, optical observations
  45. GRB 021004: VRI observations at TNG: possible break
  46. GRB021016, optical observations
  47. SGR1900+14: burst on October 10 2002
  48. GRB 021008, optical observations
  49. GRB021016(=H2397): A Long GRB Localized by HETE
  50. IPN triangulation of GRB021016 (small error box)
  51. IPN triangulation of GRB021014 (large error box)
  52. IPN triangulation of GRB021013 (single error box)
  53. GRB 021004: optical spectroscopy on Oct 11
  54. IPN triangulation of GRB021013 (two small error boxes)
  55. GRB021004: High-resolution optical spectroscopy
  56. IPN triangulation of GRB021013 (annulus)
  57. GRB021004, UBVRcIc field photometry update
  58. IPN triangulation of GRB021008 (single error box)
  59. GRB 021004 submm observations
  60. IPN triangulation of GRB021008B (annulus)
  61. IPN triangulation of GRB021008 (two small error boxes)
  62. GRB 021004: Optical/NIR Observations
  63. GRB 021004: Additional V-band Polarimetric Observations
  64. GRB021004: optical observation
  65. GRB 021004: Host Galaxy Star Formation Rate
  66. GRB 021004 submm observations
  67. GRB 021004: WC wind?
  68. IPN triangulation of GRB021008
  69. GRB 021004: Optical measurement at OHP
  70. GRB 021004: Optical observations, AUDE network
  71. GRB 021004 - VLA Radio Observations
  72. GRB 021004 - Unusual Radio-to-Submm Spectrum
  73. GRB 021004: optical spectroscopy
  74. IPN triangulation of GRB021007 (annulus)
  75. GRB 021004: HST/STIS spectroscopic observations
  76. GRB021004: optical observations and predicted break time
  77. GRB 021004 redshift
  78. GRB 021004: Optical Decay
  79. GRB 021004 continued IR fading
  80. HETE fluences for GRB021004
  81. GRB 021004, spectroscopic observations
  82. GRB021004: not fading anymore?
  83. GRB 021004: Optical Photometry at 2.5 Days
  84. GRB 021004: polarimetric observations
  85. GRB 021004: V-band Polarimetric Observations
  86. GRB 021004: Optical Decay
  87. GRB021004, astrometric position
  88. GRB021004, Optical Observations
  89. IRAM Millimeter detection of GRB 021004
  90. GRB 021004: Optical observations at RIKEN
  91. GRB 021004 radio observation
  92. GRB 021004: Optical Observations
  93. GRB021004: continued fading
  94. GRB 021004: Optical Photometry at 1.5 Days
  95. GRB021004, Optical Observations
  96. GRB021004, BVRcIc field photometry
  97. GRB 021004: Optical observations
  98. GRB 021004: optical counterpart
  99. GRB 021004, optical observations
  100. GRB021004: Optical Spectroscopy

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