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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"

36190 results found.

  1. IPN triangulation of GRB021211B (two large error boxes)
  2. GRB 021211: early break in light curve
  3. GRB021211, BVRI field photometry
  4. GRB 021211, IR observations
  5. GRB 021211, optical observations
  6. GRB 021211: Optical Observations
  7. GRB021211: Kiso Observations
  8. GRB021204: Kiso Observations
  9. GRB 021201, optical observations
  10. GRB 021211: Radio Observations
  11. GRB 021201 (short/hard), NOT observations
  12. SUB-MM SEARCH FOR GRB 021211
  13. GRB 021211 Milagro GeV/TeV Observations
  14. GRB 021211, R- and I-band observations
  15. GRB021211 - Upper limits from recent and historical observations
  16. GRB 021204: I-band Observations
  17. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  18. HETE 2493: Optical observations
  19. GRB 021204: Optical Observations at RIKEN
  20. GRB 021125: Radio Observations
  21. IPN triangulation of GRB021206 (small error box)
  22. IPN triangulation of GRB021206 (exceptionally bright; annulus only)
  23. IPN detection of renewed activity from SGR1806-20
  24. IPN triangulation of GRB021205 (large error box)
  25. GRB 021104, GRB 021112 and GRB 021113 - Milagro GeV/TeV Observations
  26. GRB021201, BVRcIc field photometry
  27. GRB 021201, Radio Observations
  28. GRB 021201: Optical Observations
  29. GRB 021201: BOOTES simultaneous optical observations
  30. IPN triangulation of GRB021201 (short/hard burst, small error box)
  31. Radio Catalog of GRB Afterglows
  32. GRB021004, late time optical observations
  33. GRB021004 Chandra Observation
  34. IPN detection of continued SGR1900+14 activity
  35. IPN triangulation of GRB021115 (annulus)
  36. IPN triangulation of GRB021125B (two large error boxes)
  37. IPN triangulation of GRB021119 (large error box)
  38. IPN triangulation of GRB021125B (annulus)
  39. Improved IPN error box for GRB021125
  40. IPN triangulation of GRB021125 (INTEGRAL BURST)
  41. GRB021125 : A long GRB localized by INTEGRAL
  42. IPN confirmation of the reactivation of SGR1900+14
  43. IPN detection of possible reactivation of SGR1900+14
  44. GRB021113, SPI ACS observation
  45. IPN triangulation of GRB021119 (annulus)
  46. GRB 021112: Afterglow or Variable Star?
  47. GRB021113: optical observations at Bisei
  48. GRB 021113: Evidence for a Dark Optical Afterglow
  49. GRB 021112, Radio Observations
  50. GRB021112, BVRI field photometry
  51. GRB 021112: Variable Source in R-band search
  52. GRB021112: Optical Observations
  53. GRB021113: Kiso Observations
  54. IPN triangulation of GRB021109 (portion of annulus)
  55. IPN triangulation of GRB021113 (=H2449; annulus)
  56. IPN triangulation of GRB021108 (CORRECTION; TWO LARGE ERROR BOXES)
  57. GRB 021113: Optical observations
  58. GRB 021112: RAPTOR Observations
  59. GRB 021113: Optical Observations
  60. GRB 021113: Optical Observations
  61. GRB021113 (=H2449): A Long GRB Localized by HETE
  62. GRB 021112: Optical Observations
  63. GRB 021112: R-band search
  64. IPN triangulation of GRB021108 (large error box)
  65. GRB021112 (=H2448): A Long GRB Localized by HETE
  66. GRB 021016: Optical Observations
  67. IPN triangulation of GRB021109 (annulus)
  68. IPN triangulation of GRB021108 (annulus)
  69. IPN triangulation of GRB021104 (annulus)
  70. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  71. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  72. SGR1900+14 activity, November 2-4, 2002
  73. GRB021104: Candidate present in DSS
  74. IPN triangulation of GRB021102 (annulus)
  75. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  76. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  77. IPN triangulation of GRB021025 (portion of annulus)
  78. IPN triangulation of GRB021027 (single large error box)
  79. GRB021004, late-time optical observations
  80. IPN triangulation of GRB021027 (two large error boxes)
  81. GRB 021023: Infrared Imaging
  82. IPN triangulation of GRB021027 (annulus)
  83. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  84. IPN triangulation of GRB021025 (annulus)
  85. IPN triangulation of SGR1900+14, October 22 2002
  86. GRB 021004: optical observations
  87. IPN triangulation of GRB021023 (small error boc)
  88. GRB 020813; likely host galaxy.
  89. IPN triangulation of GRB021020 (smaller error box)
  90. IPN triangulation of GRB021020
  91. GRB 021008, radio observations
  92. GRB 021016, optical observations
  93. GRB 021004: VRI observations at TNG: possible break
  94. GRB021016, optical observations
  95. SGR1900+14: burst on October 10 2002
  96. GRB 021008, optical observations
  97. GRB021016(=H2397): A Long GRB Localized by HETE
  98. IPN triangulation of GRB021016 (small error box)
  99. IPN triangulation of GRB021014 (large error box)
  100. IPN triangulation of GRB021013 (single error box)

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