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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"

42637 results found.

  1. IPN triangulation of GRB021027 (annulus)
  2. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  3. IPN triangulation of GRB021025 (annulus)
  4. IPN triangulation of SGR1900+14, October 22 2002
  5. GRB 021004: optical observations
  6. IPN triangulation of GRB021023 (small error boc)
  7. GRB 020813; likely host galaxy.
  8. IPN triangulation of GRB021020 (smaller error box)
  9. GRB021021(=XRF 021021): An X-ray Flash Localized by HETE
  10. IPN triangulation of GRB021020
  11. GRB 021008, radio observations
  12. GRB 021004: VRI observations at TNG: possible break
  13. GRB021016, optical observations
  14. SGR1900+14: burst on October 10 2002
  15. GRB 021008, optical observations
  16. GRB021016(=H2397): A Long GRB Localized by HETE
  17. IPN triangulation of GRB021016 (small error box)
  18. GRB021004: Optical Observations
  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. XRF 020903: flattening of the optical light curve.
  26. GRB021004, UBVRcIc field photometry update
  27. IPN triangulation of GRB021008 (single error box)
  28. GRB021004: Optical Observations
  29. GRB 021004 submm observations
  30. IPN triangulation of GRB021008B (annulus)
  31. IPN triangulation of GRB021008 (two small error boxes)
  32. GRB021004 Chandra HETG Observations
  33. GRB 021004: Optical/NIR Observations
  34. GRB 021004: Additional V-band Polarimetric Observations
  35. GRB021004: optical observation
  36. GRB 021004: Host Galaxy Star Formation Rate
  37. GRB 021004 submm observations
  38. GRB 021004: WC wind?
  39. IPN triangulation of GRB021008
  40. GRB021004: NIR and Optical observations
  41. GRB 021004: Optical measurement at OHP
  42. GRB 021004: Optical observations, AUDE network
  43. GRB 021004 - VLA Radio Observations
  44. GRB 021004 - Unusual Radio-to-Submm Spectrum
  45. GRB 021004: optical spectroscopy
  46. IPN triangulation of GRB021007 (annulus)
  47. XRF 020903 spectrum
  48. GRB 021004: HST/STIS spectroscopic observations
  49. GRB021004: optical observations and predicted break time
  50. GRB021004: BVRc photometry
  51. GRB 021004 redshift
  52. GRB021004 radio observation
  53. GRB021004: restart of optical decay
  54. GRB 021004 continued IR fading
  55. HETE fluences for GRB021004
  56. GRB 021004, spectroscopic observations
  57. GRB021004: not fading anymore?
  58. GRB 021004: Optical Photometry at 2.5 Days
  59. GRB 021004: polarimetric observations
  60. GRB 021004: V-band Polarimetric Observations
  61. GRB 021004: Optical Decay
  62. GRB021004, astrometric position
  63. GRB021004, Optical Observations
  64. IRAM Millimeter detection of GRB 021004
  65. GRB 021004: Optical observations at RIKEN
  66. GRB 021004 radio observation
  67. GRB 021004: Optical Observations
  68. GRB 021004: Optical Photometry at 1.5 Days
  69. GRB021004, BVRcIc field photometry
  70. GRB 021004: Optical observations
  71. GRB 021004: optical counterpart
  72. GRB 021004, optical observations
  73. GRB021004: Optical Spectroscopy
  74. GRB 021004: Optical Observations
  75. GRB 021004, optical observations
  76. GRB 021004: radio observations
  77. GRB 021004: steepening of the optical decay slope
  78. GRB021004: Upper limits from recent and historical observations
  79. XRF020903, BVRI field photometry
  80. GRB021004: optical observations at Nyrola
  81. GRB021004: Absorption redshift
  82. GRB021004(=H2380): Revised Localization with HETE Soft X-ray
  83. GRB021004: optical observations at Bisei
  84. GRB 021004: Kyoto observation
  85. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  86. GRB021004: Optical Afterglow
  87. XRF020903: TNG and Asiago photometry
  88. GRB 020903: Optical observations at RIKEN
  89. XRF 020903: Correction to GCN 1560
  90. XRF 020903: VRI observations
  91. IPN triangulation of GRB020926 (single large error box)
  92. XRF 020903: R band observations
  93. XRF 020903: Archival Optical Images
  94. Radio Observations of XRF 020903: The Missing Link
  95. XRF 020903: Supernova
  96. IPN triangulation of GRB020926 (two large error boxes)
  97. GRB020924 (ecliptic latitude-only localization)
  98. IPN triangulation of GRB020923 (two error boxes)
  99. IPN annulus for GRB020923
  100. IPN triangulation of GRB020914B

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