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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"

45593 results found.

  1. GRB 021004 - VLA Radio Observations
  2. GRB 021004 - Unusual Radio-to-Submm Spectrum
  3. GRB 021004: optical spectroscopy
  4. IPN triangulation of GRB021007 (annulus)
  5. XRF 020903 spectrum
  6. GRB 021004: HST/STIS spectroscopic observations
  7. GRB021004: optical observations and predicted break time
  8. GRB021004: BVRc photometry
  9. GRB 021004 redshift
  10. GRB021004 radio observation
  11. GRB021004: restart of optical decay
  12. GRB 021004: Optical Decay
  13. GRB 021004 continued IR fading
  14. HETE fluences for GRB021004
  15. GRB 021004, spectroscopic observations
  16. GRB021004: not fading anymore?
  17. GRB 021004: Optical Photometry at 2.5 Days
  18. GRB 021004: polarimetric observations
  19. GRB 021004: V-band Polarimetric Observations
  20. GRB021004: Update Bisei photometric data
  21. GRB 021004: Optical Decay
  22. GRB021004, astrometric position
  23. GRB021004, Optical Observations
  24. IRAM Millimeter detection of GRB 021004
  25. GRB 021004: Optical observations at RIKEN
  26. GRB 021004 radio observation
  27. GRB 021004: Optical Observations
  28. GRB021004: continued fading
  29. GRB 021004: Optical Photometry at 1.5 Days
  30. GRB021004, Optical Observations
  31. GRB021004, BVRcIc field photometry
  32. GRB 021004: Optical observations
  33. GRB 021004: optical counterpart
  34. GRB 021004, optical observations
  35. GRB021004: Optical Spectroscopy
  36. GRB 021004: Optical Observations
  37. GRB 021004, SPM optical observations
  38. GRB 021004, optical observations
  39. GRB 021004 radio search
  40. GRB 021004: radio observations
  41. GRB 021004: steepening of the optical decay slope
  42. GRB021004: Upper limits from recent and historical observations
  43. XRF020903, BVRI field photometry
  44. GRB021004: optical observations at Nyrola
  45. GRB021004: Absorption redshift
  46. GRB021004(=H2380): Revised Localization with HETE Soft X-ray
  47. GRB021004: optical observations at Bisei
  48. GRB 021004: Kyoto observation
  49. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  50. GRB021004: Optical Afterglow
  51. XRF020903: TNG and Asiago photometry
  52. GRB 020903: Optical observations at RIKEN
  53. XRF 020903: Correction to GCN 1560
  54. XRF 020903: VRI observations
  55. IPN triangulation of GRB020926 (single large error box)
  56. GRB 020903: correction to GCN 1557
  57. XRF 020903: R band observations
  58. XRF 020903: Archival Optical Images
  59. Radio Observations of XRF 020903: The Missing Link
  60. XRF 020903: Supernova
  61. IPN triangulation of GRB020926 (two large error boxes)
  62. GRB020924 (ecliptic latitude-only localization)
  63. IPN triangulation of GRB020923 (two error boxes)
  64. IPN annulus for GRB020923
  65. IPN triangulation of GRB020914B
  66. Improved IPN position for GRB020918 (two large error boxes)
  67. IPN annulus for GRB020914B
  68. IPN triangulation of GRB020918 (annulus)
  69. IPN triangulation of GRB020911 (2 large error boxes)
  70. IPN triangulation of GRB020914 - clarification and additional information
  71. IPN triangulation of GRB020914
  72. GRB 020305: HST/STIS observations
  73. Confirmation of IPN error box for GRB020910
  74. IPN triangulation of GRB020910
  75. IPN GCN Circulars now to be issued without restriction
  76. Single IPN error box for GRB020904
  77. XRF 020903: optical observation at Kyoto
  78. GRB020322 : HST/STIS observations
  79. XRF 020903: Optical observations
  80. IPN triangulation of GRB020904
  81. XRF 020903: Optical observations
  82. IPN detection of a burst from SGR1900+14
  83. XRF 020903, optical observations
  84. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  85. INTEGRAL GRBs added to GCN
  86. GRB020813: optical observation
  87. GRB020812: optical observation
  88. GRB020819(=H2275): Revised Localization with HETE Soft X-ray
  89. SGR1900+14 burst localized by HETE
  90. GRB020813: High-resolution optical spectroscopy
  91. GRB020819: optical observations at Bisei
  92. GRB020812: negative optical observations
  93. GRB 020812: optical observation at Kyoto University
  94. Second epoch K band imaging of GRB 020819
  95. GRB020813, Baade 6.5m data now available
  96. GRB 020813 : HST observations
  97. Confirming no variability for GRB02081
  98. GRB020819 : Optical observations at KISO
  99. GRB 020812: early time optical observation at Ouda Station
  100. GRB020813: VRI Decay Slopes

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