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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"

42805 results found.

  1. GRB 021004: Optical/NIR Observations
  2. GRB 021004: Additional V-band Polarimetric Observations
  3. GRB021004: optical observation
  4. GRB 021004: Host Galaxy Star Formation Rate
  5. GRB 021004 submm observations
  6. GRB 021004: WC wind?
  7. IPN triangulation of GRB021008
  8. GRB021004: NIR and Optical observations
  9. GRB 021004: Optical measurement at OHP
  10. GRB 021004: Optical observations, AUDE network
  11. GRB 021004 - VLA Radio Observations
  12. GRB 021004 - Unusual Radio-to-Submm Spectrum
  13. GRB 021004: optical spectroscopy
  14. IPN triangulation of GRB021007 (annulus)
  15. XRF 020903 spectrum
  16. GRB 021004: HST/STIS spectroscopic observations
  17. GRB021004: optical observations and predicted break time
  18. GRB021004: BVRc photometry
  19. GRB 021004 redshift
  20. GRB021004 radio observation
  21. GRB021004: restart of optical decay
  22. GRB 021004 continued IR fading
  23. HETE fluences for GRB021004
  24. GRB 021004, spectroscopic observations
  25. GRB021004: not fading anymore?
  26. GRB 021004: Optical Photometry at 2.5 Days
  27. GRB 021004: polarimetric observations
  28. GRB 021004: V-band Polarimetric Observations
  29. GRB 021004: Optical Decay
  30. GRB021004, astrometric position
  31. GRB021004, Optical Observations
  32. IRAM Millimeter detection of GRB 021004
  33. GRB 021004: Optical observations at RIKEN
  34. GRB 021004 radio observation
  35. GRB 021004: Optical Observations
  36. GRB 021004: Optical Photometry at 1.5 Days
  37. GRB021004, BVRcIc field photometry
  38. GRB 021004: Optical observations
  39. GRB 021004: optical counterpart
  40. GRB 021004, optical observations
  41. GRB021004: Optical Spectroscopy
  42. GRB 021004: Optical Observations
  43. GRB 021004, optical observations
  44. GRB 021004: radio observations
  45. GRB 021004: steepening of the optical decay slope
  46. GRB021004: Upper limits from recent and historical observations
  47. XRF020903, BVRI field photometry
  48. GRB021004: optical observations at Nyrola
  49. GRB021004: Absorption redshift
  50. GRB021004(=H2380): Revised Localization with HETE Soft X-ray
  51. GRB021004: optical observations at Bisei
  52. GRB 021004: Kyoto observation
  53. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  54. GRB021004: Optical Afterglow
  55. XRF020903: TNG and Asiago photometry
  56. GRB 020903: Optical observations at RIKEN
  57. XRF 020903: Correction to GCN 1560
  58. XRF 020903: VRI observations
  59. IPN triangulation of GRB020926 (single large error box)
  60. XRF 020903: R band observations
  61. XRF 020903: Archival Optical Images
  62. Radio Observations of XRF 020903: The Missing Link
  63. XRF 020903: Supernova
  64. IPN triangulation of GRB020926 (two large error boxes)
  65. GRB020924 (ecliptic latitude-only localization)
  66. IPN triangulation of GRB020923 (two error boxes)
  67. IPN annulus for GRB020923
  68. IPN triangulation of GRB020914B
  69. Improved IPN position for GRB020918 (two large error boxes)
  70. IPN annulus for GRB020914B
  71. IPN triangulation of GRB020918 (annulus)
  72. IPN triangulation of GRB020911 (2 large error boxes)
  73. IPN triangulation of GRB020914 - clarification and additional information
  74. IPN triangulation of GRB020914
  75. GRB 020305: HST/STIS observations
  76. Confirmation of IPN error box for GRB020910
  77. IPN triangulation of GRB020910
  78. IPN GCN Circulars now to be issued without restriction
  79. Single IPN error box for GRB020904
  80. XRF 020903: optical observation at Kyoto
  81. GRB020322 : HST/STIS observations
  82. XRF 020903: Optical observations
  83. IPN triangulation of GRB020904
  84. XRF 020903: Optical observations
  85. IPN detection of a burst from SGR1900+14
  86. XRF 020903, optical observations
  87. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  88. INTEGRAL GRBs added to GCN
  89. GRB020813: optical observation
  90. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  91. SGR1900+14 burst localized by HETE
  92. GRB020813: High-resolution optical spectroscopy
  93. GRB020819: optical observations at Bisei
  94. GRB020812: negative optical observations
  95. GRB 020812: optical observation at Kyoto University
  96. Second epoch K band imaging of GRB 020819
  97. GRB020813, Baade 6.5m data now available
  98. GRB 020813 : HST observations
  99. Confirming no variability for GRB02081
  100. GRB020819 : Optical observations at KISO

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