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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"

19237 results found.

  1. GRB 021201: Optical Observations
  2. GRB 021211: CTIO observations
  3. VLT spectrum of GRB 021211
  4. GRB 021211, optical observations
  5. SUB-MM SEARCH FOR GRB 021211
  6. Chandra observation of the IPN error box of GRB021201 (short/hard)
  7. GRB021211 - Upper limits from recent and historical observations
  8. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  9. IPN triangulation of GRB021206 (small error box)
  10. IPN triangulation of GRB021205 (large error box)
  11. GRB 021201: BOOTES simultaneous optical observations
  12. IPN triangulation of GRB021201 (short/hard burst, small error box)
  13. GRB021004 Chandra Observation
  14. IPN detection of continued SGR1900+14 activity
  15. Improved IPN error box for GRB021125
  16. IPN BURST POSITION
  17. IPN triangulation of GRB021125 (INTEGRAL BURST)
  18. IPN confirmation of the reactivation of SGR1900+14
  19. GRB021113, SPI ACS observation
  20. GRB 021112: Afterglow or Variable Star?
  21. GRB 021113: Evidence for a Dark Optical Afterglow
  22. GRB021112, BVRI field photometry
  23. IPN triangulation of GRB021113 (=H2449; annulus)
  24. GRB021113 (=H2449): A Long GRB Localized by HETE
  25. GRB021112 (=H2448): A Long GRB Localized by HETE
  26. GRB 021016: Optical Observations
  27. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  28. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  29. SGR1900+14 activity, November 2-4, 2002
  30. Detection of activity from SGR 1900+14 with the RXTE/PCA
  31. IPN triangulation of GRB021027 (single large error box)
  32. IPN triangulation of GRB021027 (two large error boxes)
  33. IPN triangulation of GRB021027 (annulus)
  34. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  35. IPN triangulation of GRB021025 (annulus)
  36. IPN triangulation of SGR1900+14, October 22 2002
  37. GRB 021004: optical observations
  38. IPN triangulation of GRB021023 (small error boc)
  39. GRB 020813; likely host galaxy.
  40. IPN triangulation of GRB021020 (smaller error box)
  41. IPN triangulation of GRB021020
  42. SGR1900+14: burst on October 10 2002
  43. GRB 021008, optical observations
  44. IPN triangulation of GRB021016 (small error box)
  45. IPN triangulation of GRB021014 (large error box)
  46. IPN triangulation of GRB021013 (single error box)
  47. GRB 021004: optical spectroscopy on Oct 11
  48. IPN triangulation of GRB021013 (two small error boxes)
  49. GRB021004: High-resolution optical spectroscopy
  50. IPN triangulation of GRB021013 (annulus)
  51. XRF 020903: flattening of the optical light curve.
  52. IPN triangulation of GRB021008 (single error box)
  53. GRB 021004 submm observations
  54. IPN triangulation of GRB021008B (annulus)
  55. IPN triangulation of GRB021008 (two small error boxes)
  56. GRB021004 Chandra HETG Observations
  57. GRB 021004: Additional V-band Polarimetric Observations
  58. GRB 021004: Host Galaxy Star Formation Rate
  59. GRB 021004 submm observations
  60. GRB 021004: WC wind?
  61. GRB021004: NIR and Optical observations
  62. GRB 021004: Optical observations, AUDE network
  63. GRB 021004 - VLA Radio Observations
  64. GRB 021004 - Unusual Radio-to-Submm Spectrum
  65. GRB 021004: optical spectroscopy
  66. IPN triangulation of GRB021007 (annulus)
  67. GRB021004: optical observations and predicted break time
  68. GRB021004: BVRc photometry
  69. GRB021004: restart of optical decay
  70. GRB 021004: Optical Decay
  71. GRB 021004 continued IR fading
  72. HETE fluences for GRB021004
  73. GRB021004: not fading anymore?
  74. GRB 021004: polarimetric observations
  75. GRB 021004: V-band Polarimetric Observations
  76. GRB021004: Update Bisei photometric data
  77. IRAM Millimeter detection of GRB 021004
  78. GRB021004: Optical Spectroscopy
  79. XRF020903, BVRI field photometry
  80. XRF020903: TNG and Asiago photometry
  81. GRB 020903: Optical observations at RIKEN
  82. XRF 020903: Correction to GCN 1560
  83. XRF 020903: VRI observations
  84. XRF 020903: Archival Optical Images
  85. Radio Observations of XRF 020903: The Missing Link
  86. XRF 020903: Supernova
  87. IPN triangulation of GRB020926 (two large error boxes)
  88. IPN triangulation of GRB020923 (two error boxes)
  89. IPN triangulation of GRB020914B
  90. IPN triangulation of GRB020911 (2 large error boxes)
  91. IPN triangulation of GRB020914 - clarification and additional information
  92. Confirmation of IPN error box for GRB020910
  93. IPN triangulation of GRB020910
  94. IPN GCN Circulars now to be issued without restriction
  95. Single IPN error box for GRB020904
  96. IPN triangulation of GRB020904
  97. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  98. INTEGRAL GRBs added to GCN
  99. SGR1900+14 burst localized by HETE
  100. GRB020813: High-resolution optical spectroscopy

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