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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"

35994 results found.

  1. GRB 021211, optical observations
  2. GRB 021211: CTIO observations
  3. GRB021211: Measurement of Early Time Afterglow
  4. VLT spectrum of GRB 021211
  5. IPN triangulation of GRB021211B (two large error boxes)
  6. GRB 021211: early break in light curve
  7. GRB021211, BVRI field photometry
  8. GRB 021211, IR observations
  9. GRB 021211, optical observations
  10. GRB 021211: Optical Observations
  11. GRB021211: Kiso Observations
  12. GRB021204: Kiso Observations
  13. GRB 021201, optical observations
  14. GRB 021211: Radio Observations
  15. GRB 021201 (short/hard), NOT observations
  16. SUB-MM SEARCH FOR GRB 021211
  17. GRB 021211 Milagro GeV/TeV Observations
  18. GRB 021211, R- and I-band observations
  19. GRB021211 - Upper limits from recent and historical observations
  20. GRB 021204: I-band Observations
  21. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  22. HETE 2493: Optical observations
  23. GRB 021204: Optical Observations at RIKEN
  24. GRB 021125: Radio Observations
  25. IPN triangulation of GRB021206 (small error box)
  26. IPN triangulation of GRB021206 (exceptionally bright; annulus only)
  27. IPN detection of renewed activity from SGR1806-20
  28. IPN triangulation of GRB021205 (large error box)
  29. GRB 021104, GRB 021112 and GRB 021113 - Milagro GeV/TeV Observations
  30. GRB021201, BVRcIc field photometry
  31. GRB 021201, Radio Observations
  32. GRB 021201: Optical Observations
  33. GRB 021201: BOOTES simultaneous optical observations
  34. IPN triangulation of GRB021201 (short/hard burst, small error box)
  35. Radio Catalog of GRB Afterglows
  36. GRB021004, late time optical observations
  37. GRB021004 Chandra Observation
  38. IPN detection of continued SGR1900+14 activity
  39. IPN triangulation of GRB021115 (annulus)
  40. IPN triangulation of GRB021125B (two large error boxes)
  41. IPN triangulation of GRB021119 (large error box)
  42. IPN triangulation of GRB021125B (annulus)
  43. Improved IPN error box for GRB021125
  44. IPN triangulation of GRB021125 (INTEGRAL BURST)
  45. GRB021125 : A long GRB localized by INTEGRAL
  46. IPN confirmation of the reactivation of SGR1900+14
  47. IPN detection of possible reactivation of SGR1900+14
  48. GRB021113, SPI ACS observation
  49. IPN triangulation of GRB021119 (annulus)
  50. GRB 021112: Afterglow or Variable Star?
  51. GRB021113: optical observations at Bisei
  52. GRB 021113: Evidence for a Dark Optical Afterglow
  53. GRB 021112, Radio Observations
  54. GRB021112, BVRI field photometry
  55. GRB 021112: Variable Source in R-band search
  56. GRB021112: Optical Observations
  57. GRB021113: Kiso Observations
  58. IPN triangulation of GRB021109 (portion of annulus)
  59. IPN triangulation of GRB021113 (=H2449; annulus)
  60. IPN triangulation of GRB021108 (CORRECTION; TWO LARGE ERROR BOXES)
  61. GRB 021113: Optical observations
  62. GRB 021112: RAPTOR Observations
  63. GRB 021113: Optical Observations
  64. GRB 021113: Optical Observations
  65. GRB021113 (=H2449): A Long GRB Localized by HETE
  66. GRB 021112: Optical Observations
  67. GRB 021112: R-band search
  68. IPN triangulation of GRB021108 (large error box)
  69. GRB021112 (=H2448): A Long GRB Localized by HETE
  70. GRB 021016: Optical Observations
  71. IPN triangulation of GRB021109 (annulus)
  72. IPN triangulation of GRB021108 (annulus)
  73. IPN triangulation of GRB021104 (annulus)
  74. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  75. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  76. SGR1900+14 activity, November 2-4, 2002
  77. GRB021104: Candidate present in DSS
  78. IPN triangulation of GRB021102 (annulus)
  79. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  80. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  81. IPN triangulation of GRB021025 (portion of annulus)
  82. IPN triangulation of GRB021027 (single large error box)
  83. GRB021004, late-time optical observations
  84. IPN triangulation of GRB021027 (two large error boxes)
  85. GRB 021023: Infrared Imaging
  86. IPN triangulation of GRB021027 (annulus)
  87. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  88. IPN triangulation of GRB021025 (annulus)
  89. IPN triangulation of SGR1900+14, October 22 2002
  90. GRB 021004: optical observations
  91. IPN triangulation of GRB021023 (small error boc)
  92. GRB 020813; likely host galaxy.
  93. IPN triangulation of GRB021020 (smaller error box)
  94. IPN triangulation of GRB021020
  95. GRB 021008, radio observations
  96. GRB 021016, optical observations
  97. GRB 021004: VRI observations at TNG: possible break
  98. GRB021016, optical observations
  99. SGR1900+14: burst on October 10 2002
  100. GRB 021008, optical observations

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