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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"

36108 results found.

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

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