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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"

42837 results found.

  1. GRB 021211: Optical Observations
  2. GRB021211: Kiso Observations
  3. GRB021204: Kiso Observations
  4. GRB 021201, optical observations
  5. GRB 021211: Radio Observations
  6. GRB021211: Optical observations
  7. GRB 021201 (short/hard), NOT observations
  8. SUB-MM SEARCH FOR GRB 021211
  9. Chandra observation of the IPN error box of GRB021201 (short/hard)
  10. GRB 021211, R- and I-band observations
  11. GRB021211 - Upper limits from recent and historical observations
  12. GRB021211, OT at 108 s
  13. GRB021211 (HETE2493), OT at 143 sec
  14. GRB 021204: I-band Observations
  15. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  16. HETE 2493: Optical observations
  17. HETE 2493: Optical observations
  18. HETE 2493: Optical candidate
  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. GRB021125 refined position
  36. IPN triangulation of GRB021115 (annulus)
  37. IPN triangulation of GRB021125B (two large error boxes)
  38. IPN triangulation of GRB021119 (large error box)
  39. IPN triangulation of GRB021125B (annulus)
  40. Improved IPN error box for GRB021125
  41. IPN triangulation of GRB021125 (INTEGRAL BURST)
  42. GRB021125 : A long GRB localized by INTEGRAL
  43. IPN confirmation of the reactivation of SGR1900+14
  44. IPN detection of possible reactivation of SGR1900+14
  45. GRB021113, SPI ACS observation
  46. IPN triangulation of GRB021119 (annulus)
  47. GRB 021112: Afterglow or Variable Star?
  48. GRB021113: optical observations at Bisei
  49. GRB 021113: Evidence for a Dark Optical Afterglow
  50. GRB 021112, Radio Observations
  51. GRB021112, BVRI field photometry
  52. GRB 021112: Variable Source in R-band search
  53. GRB021112: Optical 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. GRB021004: Near infrared spectroscopy
  70. GRB021104: Optical Observations
  71. IPN triangulation of GRB021104 (annulus)
  72. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  73. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  74. SGR1900+14 activity, November 2-4, 2002
  75. Spectropolarimetry of GRB021004
  76. GRB021104: Optical observations
  77. GRB021104: optical observations
  78. GRB021104: Candidate present in DSS
  79. GRB021104: possible optical afterglow
  80. IPN triangulation of GRB021102 (annulus)
  81. Detection of activity from SGR 1900+14 with the RXTE/PCA
  82. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  83. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  84. IPN triangulation of GRB021025 (portion of annulus)
  85. IPN triangulation of GRB021027 (single large error box)
  86. GRB021004, late-time optical observations
  87. IPN triangulation of GRB021027 (two large error boxes)
  88. GRB 021023: Infrared Imaging
  89. IPN triangulation of GRB021027 (annulus)
  90. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  91. IPN triangulation of GRB021025 (annulus)
  92. IPN triangulation of SGR1900+14, October 22 2002
  93. GRB 021004: optical observations
  94. IPN triangulation of GRB021023 (small error boc)
  95. GRB021004: Optical Observations
  96. IPN triangulation of GRB021020 (smaller error box)
  97. GRB021021(=XRF 021021): An X-ray Flash Localized by HETE
  98. IPN triangulation of GRB021020
  99. GRB 021008, radio observations
  100. GRB 021016, optical observations

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