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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"

36110 results found.

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

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