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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"

36316 results found.

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

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