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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

37504 results found.

  1. IPN triangulation of GRB021023 (small error boc)
  2. GRB 020813; likely host galaxy.
  3. IPN triangulation of GRB021020 (smaller error box)
  4. IPN triangulation of GRB021020
  5. GRB 021008, radio observations
  6. GRB 021016, optical observations
  7. GRB 021004: VRI observations at TNG: possible break
  8. GRB021016, optical observations
  9. SGR1900+14: burst on October 10 2002
  10. GRB 021008, optical observations
  11. GRB021016(=H2397): A Long GRB Localized by HETE
  12. IPN triangulation of GRB021016 (small error box)
  13. IPN triangulation of GRB021014 (large error box)
  14. IPN triangulation of GRB021013 (single error box)
  15. GRB 021004: optical spectroscopy on Oct 11
  16. IPN triangulation of GRB021013 (two small error boxes)
  17. GRB021004: High-resolution optical spectroscopy
  18. IPN triangulation of GRB021013 (annulus)
  19. GRB021004, UBVRcIc field photometry update
  20. IPN triangulation of GRB021008 (single error box)
  21. GRB 021004 submm observations
  22. IPN triangulation of GRB021008B (annulus)
  23. IPN triangulation of GRB021008 (two small error boxes)
  24. GRB 021004: Optical/NIR Observations
  25. GRB 021004: Additional V-band Polarimetric Observations
  26. GRB021004: optical observation
  27. GRB 021004: Host Galaxy Star Formation Rate
  28. GRB 021004 submm observations
  29. GRB 021004: WC wind?
  30. IPN triangulation of GRB021008
  31. GRB 021004: Optical measurement at OHP
  32. GRB 021004: Optical observations, AUDE network
  33. GRB 021004 - VLA Radio Observations
  34. GRB 021004 - Unusual Radio-to-Submm Spectrum
  35. GRB 021004: optical spectroscopy
  36. IPN triangulation of GRB021007 (annulus)
  37. GRB 021004: HST/STIS spectroscopic observations
  38. GRB021004: optical observations and predicted break time
  39. GRB 021004 redshift
  40. GRB 021004: Optical Decay
  41. GRB 021004 continued IR fading
  42. HETE fluences for GRB021004
  43. GRB 021004, spectroscopic observations
  44. GRB021004: not fading anymore?
  45. GRB 021004: Optical Photometry at 2.5 Days
  46. GRB 021004: polarimetric observations
  47. GRB 021004: V-band Polarimetric Observations
  48. GRB 021004: Optical Decay
  49. GRB021004, astrometric position
  50. GRB021004, Optical Observations
  51. IRAM Millimeter detection of GRB 021004
  52. GRB 021004: Optical observations at RIKEN
  53. GRB 021004 radio observation
  54. GRB 021004: Optical Observations
  55. GRB021004: continued fading
  56. GRB 021004: Optical Photometry at 1.5 Days
  57. GRB021004, Optical Observations
  58. GRB021004, BVRcIc field photometry
  59. GRB 021004: Optical observations
  60. GRB 021004: optical counterpart
  61. GRB 021004, optical observations
  62. GRB021004: Optical Spectroscopy
  63. GRB 021004: Optical Observations
  64. GRB 021004, SPM optical observations
  65. GRB 021004, optical observations
  66. GRB 021004 radio search
  67. GRB 021004: radio observations
  68. GRB 021004: steepening of the optical decay slope
  69. GRB021004: Upper limits from recent and historical observations
  70. XRF020903, BVRI field photometry
  71. GRB021004: optical observations at Nyrola
  72. GRB021004: Absorption redshift
  73. GRB 021004: Kyoto observation
  74. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  75. GRB021004: Optical Afterglow
  76. GRB 020903: Optical observations at RIKEN
  77. IPN triangulation of GRB020926 (single large error box)
  78. GRB 020903: correction to GCN 1557
  79. XRF 020903: R band observations
  80. Radio Observations of XRF 020903: The Missing Link
  81. IPN triangulation of GRB020926 (two large error boxes)
  82. GRB020924 (ecliptic latitude-only localization)
  83. IPN triangulation of GRB020923 (two error boxes)
  84. IPN annulus for GRB020923
  85. IPN triangulation of GRB020914B
  86. Improved IPN position for GRB020918 (two large error boxes)
  87. IPN annulus for GRB020914B
  88. IPN triangulation of GRB020918 (annulus)
  89. IPN triangulation of GRB020911 (2 large error boxes)
  90. IPN triangulation of GRB020914 - clarification and additional information
  91. IPN triangulation of GRB020914
  92. GRB 020305: HST/STIS observations
  93. Confirmation of IPN error box for GRB020910
  94. IPN triangulation of GRB020910
  95. IPN GCN Circulars now to be issued without restriction
  96. Single IPN error box for GRB020904
  97. XRF 020903: optical observation at Kyoto
  98. GRB020322 : HST/STIS observations
  99. IPN triangulation of GRB020904
  100. IPN detection of a burst from SGR1900+14

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