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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"

37579 results found.

  1. SUB-MM SEARCH FOR GRB 021211
  2. GRB 021211 Milagro GeV/TeV Observations
  3. GRB 021211, R- and I-band observations
  4. GRB021211 - Upper limits from recent and historical observations
  5. GRB 021204: I-band Observations
  6. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  7. HETE 2493: Optical observations
  8. GRB 021204: Optical Observations at RIKEN
  9. GRB 021125: Radio Observations
  10. IPN triangulation of GRB021206 (small error box)
  11. IPN triangulation of GRB021206 (exceptionally bright; annulus only)
  12. IPN detection of renewed activity from SGR1806-20
  13. IPN triangulation of GRB021205 (large error box)
  14. GRB 021104, GRB 021112 and GRB 021113 - Milagro GeV/TeV Observations
  15. GRB021201, BVRcIc field photometry
  16. GRB 021201, Radio Observations
  17. GRB 021201: Optical Observations
  18. GRB 021201: BOOTES simultaneous optical observations
  19. IPN triangulation of GRB021201 (short/hard burst, small error box)
  20. Radio Catalog of GRB Afterglows
  21. GRB021004, late time optical observations
  22. GRB021004 Chandra Observation
  23. IPN detection of continued SGR1900+14 activity
  24. IPN triangulation of GRB021115 (annulus)
  25. IPN triangulation of GRB021125B (two large error boxes)
  26. IPN triangulation of GRB021119 (large error box)
  27. IPN triangulation of GRB021125B (annulus)
  28. Improved IPN error box for GRB021125
  29. IPN triangulation of GRB021125 (INTEGRAL BURST)
  30. GRB021125 : A long GRB localized by INTEGRAL
  31. IPN confirmation of the reactivation of SGR1900+14
  32. IPN detection of possible reactivation of SGR1900+14
  33. GRB021113, SPI ACS observation
  34. IPN triangulation of GRB021119 (annulus)
  35. GRB 021112: Afterglow or Variable Star?
  36. GRB021113: optical observations at Bisei
  37. GRB 021113: Evidence for a Dark Optical Afterglow
  38. GRB 021112, Radio Observations
  39. GRB021112, BVRI field photometry
  40. GRB 021112: Variable Source in R-band search
  41. GRB021112: Optical Observations
  42. GRB021113: Kiso Observations
  43. IPN triangulation of GRB021109 (portion of annulus)
  44. IPN triangulation of GRB021113 (=H2449; annulus)
  45. IPN triangulation of GRB021108 (CORRECTION; TWO LARGE ERROR BOXES)
  46. GRB 021113: Optical observations
  47. GRB 021112: RAPTOR Observations
  48. GRB 021113: Optical Observations
  49. GRB 021113: Optical Observations
  50. GRB021113 (=H2449): A Long GRB Localized by HETE
  51. GRB 021112: Optical Observations
  52. GRB 021112: R-band search
  53. IPN triangulation of GRB021108 (large error box)
  54. GRB021112 (=H2448): A Long GRB Localized by HETE
  55. GRB 021016: Optical Observations
  56. IPN triangulation of GRB021109 (annulus)
  57. IPN triangulation of GRB021108 (annulus)
  58. IPN triangulation of GRB021104 (annulus)
  59. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  60. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  61. SGR1900+14 activity, November 2-4, 2002
  62. GRB021104: Candidate present in DSS
  63. IPN triangulation of GRB021102 (annulus)
  64. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  65. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  66. IPN triangulation of GRB021025 (portion of annulus)
  67. IPN triangulation of GRB021027 (single large error box)
  68. GRB021004, late-time optical observations
  69. IPN triangulation of GRB021027 (two large error boxes)
  70. GRB 021023: Infrared Imaging
  71. IPN triangulation of GRB021027 (annulus)
  72. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  73. IPN triangulation of GRB021025 (annulus)
  74. IPN triangulation of SGR1900+14, October 22 2002
  75. GRB 021004: optical observations
  76. IPN triangulation of GRB021023 (small error boc)
  77. GRB 020813; likely host galaxy.
  78. IPN triangulation of GRB021020 (smaller error box)
  79. IPN triangulation of GRB021020
  80. GRB 021008, radio observations
  81. GRB 021016, optical observations
  82. GRB 021004: VRI observations at TNG: possible break
  83. GRB021016, optical observations
  84. SGR1900+14: burst on October 10 2002
  85. GRB 021008, optical observations
  86. GRB021016(=H2397): A Long GRB Localized by HETE
  87. IPN triangulation of GRB021016 (small error box)
  88. IPN triangulation of GRB021014 (large error box)
  89. IPN triangulation of GRB021013 (single error box)
  90. GRB 021004: optical spectroscopy on Oct 11
  91. IPN triangulation of GRB021013 (two small error boxes)
  92. GRB021004: High-resolution optical spectroscopy
  93. IPN triangulation of GRB021013 (annulus)
  94. GRB021004, UBVRcIc field photometry update
  95. IPN triangulation of GRB021008 (single error box)
  96. GRB 021004 submm observations
  97. IPN triangulation of GRB021008B (annulus)
  98. IPN triangulation of GRB021008 (two small error boxes)
  99. GRB 021004: Optical/NIR Observations
  100. GRB 021004: Additional V-band Polarimetric Observations

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