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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"

36187 results found.

  1. GRB 021211, IR observations
  2. GRB 021211, optical observations
  3. GRB 021211: Optical Observations
  4. GRB021211: Kiso Observations
  5. GRB021204: Kiso Observations
  6. GRB 021201, optical observations
  7. GRB 021211: Radio Observations
  8. GRB 021201 (short/hard), NOT observations
  9. SUB-MM SEARCH FOR GRB 021211
  10. GRB 021211 Milagro GeV/TeV Observations
  11. GRB 021211, R- and I-band observations
  12. GRB021211 - Upper limits from recent and historical observations
  13. GRB 021204: I-band Observations
  14. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  15. HETE 2493: Optical observations
  16. GRB 021204: Optical Observations at RIKEN
  17. GRB 021125: Radio Observations
  18. IPN triangulation of GRB021206 (small error box)
  19. IPN triangulation of GRB021206 (exceptionally bright; annulus only)
  20. IPN detection of renewed activity from SGR1806-20
  21. IPN triangulation of GRB021205 (large error box)
  22. GRB 021104, GRB 021112 and GRB 021113 - Milagro GeV/TeV Observations
  23. GRB021201, BVRcIc field photometry
  24. GRB 021201, Radio Observations
  25. GRB 021201: Optical Observations
  26. GRB 021201: BOOTES simultaneous optical observations
  27. IPN triangulation of GRB021201 (short/hard burst, small error box)
  28. Radio Catalog of GRB Afterglows
  29. GRB021004, late time optical observations
  30. GRB021004 Chandra Observation
  31. IPN detection of continued SGR1900+14 activity
  32. IPN triangulation of GRB021115 (annulus)
  33. IPN triangulation of GRB021125B (two large error boxes)
  34. IPN triangulation of GRB021119 (large error box)
  35. IPN triangulation of GRB021125B (annulus)
  36. Improved IPN error box for GRB021125
  37. IPN triangulation of GRB021125 (INTEGRAL BURST)
  38. GRB021125 : A long GRB localized by INTEGRAL
  39. IPN confirmation of the reactivation of SGR1900+14
  40. IPN detection of possible reactivation of SGR1900+14
  41. GRB021113, SPI ACS observation
  42. IPN triangulation of GRB021119 (annulus)
  43. GRB 021112: Afterglow or Variable Star?
  44. GRB021113: optical observations at Bisei
  45. GRB 021113: Evidence for a Dark Optical Afterglow
  46. GRB 021112, Radio Observations
  47. GRB021112, BVRI field photometry
  48. GRB 021112: Variable Source in R-band search
  49. GRB021112: Optical Observations
  50. GRB021113: Kiso Observations
  51. IPN triangulation of GRB021109 (portion of annulus)
  52. IPN triangulation of GRB021113 (=H2449; annulus)
  53. IPN triangulation of GRB021108 (CORRECTION; TWO LARGE ERROR BOXES)
  54. GRB 021113: Optical observations
  55. GRB 021112: RAPTOR Observations
  56. GRB 021113: Optical Observations
  57. GRB 021113: Optical Observations
  58. GRB021113 (=H2449): A Long GRB Localized by HETE
  59. GRB 021112: Optical Observations
  60. GRB 021112: R-band search
  61. IPN triangulation of GRB021108 (large error box)
  62. GRB021112 (=H2448): A Long GRB Localized by HETE
  63. GRB 021016: Optical Observations
  64. IPN triangulation of GRB021109 (annulus)
  65. IPN triangulation of GRB021108 (annulus)
  66. IPN triangulation of GRB021104 (annulus)
  67. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  68. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  69. SGR1900+14 activity, November 2-4, 2002
  70. GRB021104: Candidate present in DSS
  71. IPN triangulation of GRB021102 (annulus)
  72. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  73. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  74. IPN triangulation of GRB021025 (portion of annulus)
  75. IPN triangulation of GRB021027 (single large error box)
  76. GRB021004, late-time optical observations
  77. IPN triangulation of GRB021027 (two large error boxes)
  78. GRB 021023: Infrared Imaging
  79. IPN triangulation of GRB021027 (annulus)
  80. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  81. IPN triangulation of GRB021025 (annulus)
  82. IPN triangulation of SGR1900+14, October 22 2002
  83. GRB 021004: optical observations
  84. IPN triangulation of GRB021023 (small error boc)
  85. GRB 020813; likely host galaxy.
  86. IPN triangulation of GRB021020 (smaller error box)
  87. IPN triangulation of GRB021020
  88. GRB 021008, radio observations
  89. GRB 021016, optical observations
  90. GRB 021004: VRI observations at TNG: possible break
  91. GRB021016, optical observations
  92. SGR1900+14: burst on October 10 2002
  93. GRB 021008, optical observations
  94. GRB021016(=H2397): A Long GRB Localized by HETE
  95. IPN triangulation of GRB021016 (small error box)
  96. IPN triangulation of GRB021014 (large error box)
  97. IPN triangulation of GRB021013 (single error box)
  98. GRB 021004: optical spectroscopy on Oct 11
  99. IPN triangulation of GRB021013 (two small error boxes)
  100. GRB021004: High-resolution optical spectroscopy

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