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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"

36008 results found.

  1. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  2. IPN triangulation of GRB021025 (annulus)
  3. IPN triangulation of SGR1900+14, October 22 2002
  4. GRB 021004: optical observations
  5. IPN triangulation of GRB021023 (small error boc)
  6. GRB 020813; likely host galaxy.
  7. IPN triangulation of GRB021020 (smaller error box)
  8. IPN triangulation of GRB021020
  9. GRB 021008, radio observations
  10. GRB 021016, optical observations
  11. GRB 021004: VRI observations at TNG: possible break
  12. GRB021016, optical observations
  13. SGR1900+14: burst on October 10 2002
  14. GRB 021008, optical observations
  15. GRB021016(=H2397): A Long GRB Localized by HETE
  16. IPN triangulation of GRB021016 (small error box)
  17. IPN triangulation of GRB021014 (large error box)
  18. IPN triangulation of GRB021013 (single error box)
  19. GRB 021004: optical spectroscopy on Oct 11
  20. IPN triangulation of GRB021013 (two small error boxes)
  21. GRB021004: High-resolution optical spectroscopy
  22. IPN triangulation of GRB021013 (annulus)
  23. GRB021004, UBVRcIc field photometry update
  24. IPN triangulation of GRB021008 (single error box)
  25. GRB 021004 submm observations
  26. IPN triangulation of GRB021008B (annulus)
  27. IPN triangulation of GRB021008 (two small error boxes)
  28. GRB 021004: Optical/NIR Observations
  29. GRB 021004: Additional V-band Polarimetric Observations
  30. GRB021004: optical observation
  31. GRB 021004: Host Galaxy Star Formation Rate
  32. GRB 021004 submm observations
  33. GRB 021004: WC wind?
  34. IPN triangulation of GRB021008
  35. GRB 021004: Optical measurement at OHP
  36. GRB 021004: Optical observations, AUDE network
  37. GRB 021004 - VLA Radio Observations
  38. GRB 021004 - Unusual Radio-to-Submm Spectrum
  39. GRB 021004: optical spectroscopy
  40. IPN triangulation of GRB021007 (annulus)
  41. GRB 021004: HST/STIS spectroscopic observations
  42. GRB021004: optical observations and predicted break time
  43. GRB 021004 redshift
  44. GRB 021004: Optical Decay
  45. GRB 021004 continued IR fading
  46. HETE fluences for GRB021004
  47. GRB 021004, spectroscopic observations
  48. GRB021004: not fading anymore?
  49. GRB 021004: Optical Photometry at 2.5 Days
  50. GRB 021004: polarimetric observations
  51. GRB 021004: V-band Polarimetric Observations
  52. GRB 021004: Optical Decay
  53. GRB021004, astrometric position
  54. GRB021004, Optical Observations
  55. IRAM Millimeter detection of GRB 021004
  56. GRB 021004: Optical observations at RIKEN
  57. GRB 021004 radio observation
  58. GRB 021004: Optical Observations
  59. GRB021004: continued fading
  60. GRB 021004: Optical Photometry at 1.5 Days
  61. GRB021004, Optical Observations
  62. GRB021004, BVRcIc field photometry
  63. GRB 021004: Optical observations
  64. GRB 021004: optical counterpart
  65. GRB 021004, optical observations
  66. GRB021004: Optical Spectroscopy
  67. GRB 021004: Optical Observations
  68. GRB 021004, SPM optical observations
  69. GRB 021004, optical observations
  70. GRB 021004 radio search
  71. GRB 021004: radio observations
  72. GRB 021004: steepening of the optical decay slope
  73. GRB021004: Upper limits from recent and historical observations
  74. XRF020903, BVRI field photometry
  75. GRB021004: optical observations at Nyrola
  76. GRB021004: Absorption redshift
  77. GRB 021004: Kyoto observation
  78. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  79. GRB021004: Optical Afterglow
  80. GRB 020903: Optical observations at RIKEN
  81. IPN triangulation of GRB020926 (single large error box)
  82. GRB 020903: correction to GCN 1557
  83. XRF 020903: R band observations
  84. Radio Observations of XRF 020903: The Missing Link
  85. IPN triangulation of GRB020926 (two large error boxes)
  86. GRB020924 (ecliptic latitude-only localization)
  87. IPN triangulation of GRB020923 (two error boxes)
  88. IPN annulus for GRB020923
  89. IPN triangulation of GRB020914B
  90. Improved IPN position for GRB020918 (two large error boxes)
  91. IPN annulus for GRB020914B
  92. IPN triangulation of GRB020918 (annulus)
  93. IPN triangulation of GRB020911 (2 large error boxes)
  94. IPN triangulation of GRB020914 - clarification and additional information
  95. IPN triangulation of GRB020914
  96. GRB 020305: HST/STIS observations
  97. Confirmation of IPN error box for GRB020910
  98. IPN triangulation of GRB020910
  99. IPN GCN Circulars now to be issued without restriction
  100. Single IPN error box for GRB020904

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