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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"

42860 results found.

  1. GRB021104: Candidate present in DSS
  2. GRB021104: possible optical afterglow
  3. IPN triangulation of GRB021102 (annulus)
  4. Detection of activity from SGR 1900+14 with the RXTE/PCA
  5. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  6. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  7. IPN triangulation of GRB021025 (portion of annulus)
  8. IPN triangulation of GRB021027 (single large error box)
  9. GRB021004, late-time optical observations
  10. IPN triangulation of GRB021027 (two large error boxes)
  11. GRB 021023: Infrared Imaging
  12. IPN triangulation of GRB021027 (annulus)
  13. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  14. IPN triangulation of GRB021025 (annulus)
  15. IPN triangulation of SGR1900+14, October 22 2002
  16. GRB 021004: optical observations
  17. IPN triangulation of GRB021023 (small error boc)
  18. GRB021004: Optical Observations
  19. IPN triangulation of GRB021020 (smaller error box)
  20. GRB021021(=XRF 021021): An X-ray Flash Localized by HETE
  21. IPN triangulation of GRB021020
  22. GRB 021008, radio observations
  23. GRB 021016, optical observations
  24. GRB 021004: VRI observations at TNG: possible break
  25. GRB021016, optical observations
  26. SGR1900+14: burst on October 10 2002
  27. GRB 021008, optical observations
  28. GRB021016(=H2397): A Long GRB Localized by HETE
  29. IPN triangulation of GRB021016 (small error box)
  30. GRB021004: Optical Observations
  31. IPN triangulation of GRB021014 (large error box)
  32. IPN triangulation of GRB021013 (single error box)
  33. GRB 021004: optical spectroscopy on Oct 11
  34. IPN triangulation of GRB021013 (two small error boxes)
  35. GRB021004: High-resolution optical spectroscopy
  36. IPN triangulation of GRB021013 (annulus)
  37. GRB021004, UBVRcIc field photometry update
  38. IPN triangulation of GRB021008 (single error box)
  39. GRB021004: Optical Observations
  40. GRB 021004 submm observations
  41. IPN triangulation of GRB021008B (annulus)
  42. IPN triangulation of GRB021008 (two small error boxes)
  43. GRB021004 Chandra HETG Observations
  44. GRB 021004: Optical/NIR Observations
  45. GRB 021004: Additional V-band Polarimetric Observations
  46. GRB021004: optical observation
  47. GRB 021004: Host Galaxy Star Formation Rate
  48. GRB 021004 submm observations
  49. GRB 021004: WC wind?
  50. IPN triangulation of GRB021008
  51. GRB021004: NIR and Optical observations
  52. GRB 021004: Optical measurement at OHP
  53. GRB 021004: Optical observations, AUDE network
  54. GRB 021004 - VLA Radio Observations
  55. GRB 021004 - Unusual Radio-to-Submm Spectrum
  56. GRB 021004: optical spectroscopy
  57. IPN triangulation of GRB021007 (annulus)
  58. XRF 020903 spectrum
  59. GRB 021004: HST/STIS spectroscopic observations
  60. GRB021004: optical observations and predicted break time
  61. GRB021004: BVRc photometry
  62. GRB 021004 redshift
  63. GRB021004: restart of optical decay
  64. GRB 021004: Optical Decay
  65. GRB 021004 continued IR fading
  66. HETE fluences for GRB021004
  67. GRB 021004, spectroscopic observations
  68. GRB021004: not fading anymore?
  69. GRB 021004: Optical Photometry at 2.5 Days
  70. GRB 021004: polarimetric observations
  71. GRB 021004: V-band Polarimetric Observations
  72. GRB021004: Update Bisei photometric data
  73. GRB 021004: Optical Decay
  74. GRB021004, astrometric position
  75. GRB021004, Optical Observations
  76. IRAM Millimeter detection of GRB 021004
  77. GRB 021004: Optical observations at RIKEN
  78. GRB 021004: Optical Observations
  79. GRB021004: continued fading
  80. GRB 021004: Optical Photometry at 1.5 Days
  81. GRB021004, Optical Observations
  82. GRB021004, BVRcIc field photometry
  83. GRB 021004: Optical observations
  84. GRB 021004: optical counterpart
  85. GRB 021004, optical observations
  86. GRB021004: Optical Spectroscopy
  87. GRB 021004: Optical Observations
  88. GRB 021004, SPM optical observations
  89. GRB 021004, optical observations
  90. GRB 021004: radio observations
  91. GRB 021004: steepening of the optical decay slope
  92. GRB021004: Upper limits from recent and historical observations
  93. XRF020903, BVRI field photometry
  94. GRB021004: optical observations at Nyrola
  95. GRB021004: Absorption redshift
  96. GRB021004(=H2380): Revised Localization with HETE Soft X-ray
  97. GRB021004: optical observations at Bisei
  98. GRB 021004: Kyoto observation
  99. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  100. GRB021004: Optical Afterglow

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