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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"

36213 results found.

  1. GRB021211, radio observations
  2. GRB 021112: Evidence for Another Dark Optical Afterglow
  3. GRB 021219: OSN optical observations
  4. GRB021219: Radio Observations
  5. IPN triangulation of GRB021219 - CORRECTION
  6. IPN triangulation of GRB021219
  7. GRB021219, optical observation by MASTER
  8. GRB021219: Correction to GCN 1766
  9. VLT spectra of GRB 021211 revisited
  10. GRB021219: a long GRB localized by INTEGRAL
  11. IPN detection of continued activity from SGR1806-20
  12. IPN triangulation of GRB021215 (large error box)
  13. IPN triangulation of GRB021214 (annulus)
  14. XRF 020903 : HST observations
  15. GRB 021201: Optical Observations
  16. GRB 021211, optical observations
  17. GRB 021211: CTIO observations
  18. GRB021211: Measurement of Early Time Afterglow
  19. VLT spectrum of GRB 021211
  20. IPN triangulation of GRB021211B (two large error boxes)
  21. GRB 021211: early break in light curve
  22. GRB021211, BVRI field photometry
  23. GRB 021211, IR observations
  24. GRB 021211, optical observations
  25. GRB 021211: Optical Observations
  26. GRB021211: Kiso Observations
  27. GRB021204: Kiso Observations
  28. GRB 021201, optical observations
  29. GRB 021211: Radio Observations
  30. GRB 021201 (short/hard), NOT observations
  31. SUB-MM SEARCH FOR GRB 021211
  32. GRB 021211 Milagro GeV/TeV Observations
  33. GRB 021211, R- and I-band observations
  34. GRB021211 - Upper limits from recent and historical observations
  35. GRB 021204: I-band Observations
  36. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  37. HETE 2493: Optical observations
  38. GRB 021204: Optical Observations at RIKEN
  39. GRB 021125: Radio Observations
  40. IPN triangulation of GRB021206 (small error box)
  41. IPN triangulation of GRB021206 (exceptionally bright; annulus only)
  42. IPN detection of renewed activity from SGR1806-20
  43. IPN triangulation of GRB021205 (large error box)
  44. GRB 021104, GRB 021112 and GRB 021113 - Milagro GeV/TeV Observations
  45. GRB021201, BVRcIc field photometry
  46. GRB 021201, Radio Observations
  47. GRB 021201: Optical Observations
  48. GRB 021201: BOOTES simultaneous optical observations
  49. IPN triangulation of GRB021201 (short/hard burst, small error box)
  50. Radio Catalog of GRB Afterglows
  51. GRB021004, late time optical observations
  52. GRB021004 Chandra Observation
  53. IPN detection of continued SGR1900+14 activity
  54. IPN triangulation of GRB021115 (annulus)
  55. IPN triangulation of GRB021125B (two large error boxes)
  56. IPN triangulation of GRB021119 (large error box)
  57. IPN triangulation of GRB021125B (annulus)
  58. Improved IPN error box for GRB021125
  59. IPN triangulation of GRB021125 (INTEGRAL BURST)
  60. GRB021125 : A long GRB localized by INTEGRAL
  61. IPN confirmation of the reactivation of SGR1900+14
  62. IPN detection of possible reactivation of SGR1900+14
  63. GRB021113, SPI ACS observation
  64. IPN triangulation of GRB021119 (annulus)
  65. GRB 021112: Afterglow or Variable Star?
  66. GRB021113: optical observations at Bisei
  67. GRB 021113: Evidence for a Dark Optical Afterglow
  68. GRB 021112, Radio Observations
  69. GRB021112, BVRI field photometry
  70. GRB 021112: Variable Source in R-band search
  71. GRB021112: Optical Observations
  72. GRB021113: Kiso Observations
  73. IPN triangulation of GRB021109 (portion of annulus)
  74. IPN triangulation of GRB021113 (=H2449; annulus)
  75. IPN triangulation of GRB021108 (CORRECTION; TWO LARGE ERROR BOXES)
  76. GRB 021113: Optical observations
  77. GRB 021112: RAPTOR Observations
  78. GRB 021113: Optical Observations
  79. GRB 021113: Optical Observations
  80. GRB021113 (=H2449): A Long GRB Localized by HETE
  81. GRB 021112: Optical Observations
  82. GRB 021112: R-band search
  83. IPN triangulation of GRB021108 (large error box)
  84. GRB021112 (=H2448): A Long GRB Localized by HETE
  85. GRB 021016: Optical Observations
  86. IPN triangulation of GRB021109 (annulus)
  87. IPN triangulation of GRB021108 (annulus)
  88. IPN triangulation of GRB021104 (annulus)
  89. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  90. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  91. SGR1900+14 activity, November 2-4, 2002
  92. GRB021104: Candidate present in DSS
  93. IPN triangulation of GRB021102 (annulus)
  94. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  95. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  96. IPN triangulation of GRB021025 (portion of annulus)
  97. IPN triangulation of GRB021027 (single large error box)
  98. GRB021004, late-time optical observations
  99. IPN triangulation of GRB021027 (two large error boxes)
  100. GRB 021023: Infrared Imaging

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