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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"

36315 results found.

  1. IPN triangulation of GRB021027 (two large error boxes)
  2. GRB 021023: Infrared Imaging
  3. IPN triangulation of GRB021027 (annulus)
  4. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  5. IPN triangulation of GRB021025 (annulus)
  6. IPN triangulation of SGR1900+14, October 22 2002
  7. GRB 021004: optical observations
  8. IPN triangulation of GRB021023 (small error boc)
  9. GRB 020813; likely host galaxy.
  10. IPN triangulation of GRB021020 (smaller error box)
  11. IPN triangulation of GRB021020
  12. GRB 021008, radio observations
  13. GRB 021016, optical observations
  14. GRB 021004: VRI observations at TNG: possible break
  15. GRB021016, optical observations
  16. SGR1900+14: burst on October 10 2002
  17. GRB 021008, optical observations
  18. GRB021016(=H2397): A Long GRB Localized by HETE
  19. IPN triangulation of GRB021016 (small error box)
  20. IPN triangulation of GRB021014 (large error box)
  21. IPN triangulation of GRB021013 (single error box)
  22. GRB 021004: optical spectroscopy on Oct 11
  23. IPN triangulation of GRB021013 (two small error boxes)
  24. GRB021004: High-resolution optical spectroscopy
  25. IPN triangulation of GRB021013 (annulus)
  26. GRB021004, UBVRcIc field photometry update
  27. IPN triangulation of GRB021008 (single error box)
  28. GRB 021004 submm observations
  29. IPN triangulation of GRB021008B (annulus)
  30. IPN triangulation of GRB021008 (two small error boxes)
  31. GRB 021004: Optical/NIR Observations
  32. GRB 021004: Additional V-band Polarimetric Observations
  33. GRB021004: optical observation
  34. GRB 021004: Host Galaxy Star Formation Rate
  35. GRB 021004 submm observations
  36. GRB 021004: WC wind?
  37. IPN triangulation of GRB021008
  38. GRB 021004: Optical measurement at OHP
  39. GRB 021004: Optical observations, AUDE network
  40. GRB 021004 - VLA Radio Observations
  41. GRB 021004 - Unusual Radio-to-Submm Spectrum
  42. GRB 021004: optical spectroscopy
  43. IPN triangulation of GRB021007 (annulus)
  44. GRB 021004: HST/STIS spectroscopic observations
  45. GRB021004: optical observations and predicted break time
  46. GRB 021004 redshift
  47. GRB 021004: Optical Decay
  48. GRB 021004 continued IR fading
  49. HETE fluences for GRB021004
  50. GRB 021004, spectroscopic observations
  51. GRB021004: not fading anymore?
  52. GRB 021004: Optical Photometry at 2.5 Days
  53. GRB 021004: polarimetric observations
  54. GRB 021004: V-band Polarimetric Observations
  55. GRB 021004: Optical Decay
  56. GRB021004, astrometric position
  57. GRB021004, Optical Observations
  58. IRAM Millimeter detection of GRB 021004
  59. GRB 021004: Optical observations at RIKEN
  60. GRB 021004 radio observation
  61. GRB 021004: Optical Observations
  62. GRB021004: continued fading
  63. GRB 021004: Optical Photometry at 1.5 Days
  64. GRB021004, Optical Observations
  65. GRB021004, BVRcIc field photometry
  66. GRB 021004: Optical observations
  67. GRB 021004: optical counterpart
  68. GRB 021004, optical observations
  69. GRB021004: Optical Spectroscopy
  70. GRB 021004: Optical Observations
  71. GRB 021004, SPM optical observations
  72. GRB 021004, optical observations
  73. GRB 021004 radio search
  74. GRB 021004: radio observations
  75. GRB 021004: steepening of the optical decay slope
  76. GRB021004: Upper limits from recent and historical observations
  77. XRF020903, BVRI field photometry
  78. GRB021004: optical observations at Nyrola
  79. GRB021004: Absorption redshift
  80. GRB 021004: Kyoto observation
  81. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  82. GRB021004: Optical Afterglow
  83. GRB 020903: Optical observations at RIKEN
  84. IPN triangulation of GRB020926 (single large error box)
  85. GRB 020903: correction to GCN 1557
  86. XRF 020903: R band observations
  87. Radio Observations of XRF 020903: The Missing Link
  88. IPN triangulation of GRB020926 (two large error boxes)
  89. GRB020924 (ecliptic latitude-only localization)
  90. IPN triangulation of GRB020923 (two error boxes)
  91. IPN annulus for GRB020923
  92. IPN triangulation of GRB020914B
  93. Improved IPN position for GRB020918 (two large error boxes)
  94. IPN annulus for GRB020914B
  95. IPN triangulation of GRB020918 (annulus)
  96. IPN triangulation of GRB020911 (2 large error boxes)
  97. IPN triangulation of GRB020914 - clarification and additional information
  98. IPN triangulation of GRB020914
  99. GRB 020305: HST/STIS observations
  100. Confirmation of IPN error box for GRB020910

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