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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

23601 results found.

  1. GRB021211: APO optical observations
  2. IPN triangulation of GRB021214 (annulus)
  3. XRF 020903 : HST observations
  4. GRB 021201: Optical Observations
  5. GRB021211: Measurement of Early Time Afterglow
  6. IPN triangulation of GRB021211B (two large error boxes)
  7. GRB021211, BVRI field photometry
  8. GRB021211: Optical observations in CrAO
  9. GRB 021211: Optical Observations
  10. GRB021204: Kiso Observations
  11. GRB021211: Optical observations
  12. GRB 021201 (short/hard), NOT observations
  13. Chandra observation of the IPN error box of GRB021201 (short/hard)
  14. GRB 021211 Milagro GeV/TeV 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. HETE 2493: Optical candidate
  20. GRB 021204: Optical Observations at RIKEN
  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: Optical Observations
  28. GRB 021201: BOOTES simultaneous optical observations
  29. IPN triangulation of GRB021201 (short/hard burst, small error box)
  30. GRB021004, late time optical observations
  31. GRB021004 Chandra Observation
  32. IPN triangulation of GRB021115 (annulus)
  33. IPN triangulation of GRB021119 (large error box)
  34. Improved IPN error box for GRB021125
  35. IPN BURST POSITION
  36. IPN triangulation of GRB021125 (INTEGRAL BURST)
  37. GRB021113, SPI ACS observation
  38. IPN triangulation of GRB021119 (annulus)
  39. GRB 021112: Afterglow or Variable Star?
  40. GRB021113: optical observations at Bisei
  41. GRB 021113: Evidence for a Dark Optical Afterglow
  42. GRB021112, BVRI field photometry
  43. GRB021112: Optical Observations
  44. GRB021113: Kiso Observations
  45. IPN triangulation of GRB021109 (portion of annulus)
  46. IPN triangulation of GRB021113 (=H2449; annulus)
  47. IPN triangulation of GRB021108 (CORRECTION; TWO LARGE ERROR BOXES)
  48. GRB 021113: Optical observations
  49. GRB 021112: RAPTOR Observations
  50. GRB 021113: Optical Observations
  51. GRB 021113: Optical Observations
  52. GRB021113 (=H2449): A Long GRB Localized by HETE
  53. GRB 021112: Optical Observations
  54. IPN triangulation of GRB021108 (large error box)
  55. GRB021112 (=H2448): A Long GRB Localized by HETE
  56. GRB 021016: Optical Observations
  57. IPN triangulation of GRB021109 (annulus)
  58. GRB021104: Optical Observations
  59. IPN triangulation of GRB021104 (annulus)
  60. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  61. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  62. SGR1900+14 activity, November 2-4, 2002
  63. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  64. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  65. IPN triangulation of GRB021025 (portion of annulus)
  66. IPN triangulation of GRB021027 (single large error box)
  67. IPN triangulation of GRB021027 (annulus)
  68. IPN triangulation of GRB021025 (annulus)
  69. IPN triangulation of SGR1900+14, October 22 2002
  70. GRB 021004: optical observations
  71. IPN triangulation of GRB021023 (small error boc)
  72. GRB 020813; likely host galaxy.
  73. IPN triangulation of GRB021020 (smaller error box)
  74. GRB021021(=XRF 021021): An X-ray Flash Localized by HETE
  75. IPN triangulation of GRB021020
  76. GRB 021004: VRI observations at TNG: possible break
  77. SGR1900+14: burst on October 10 2002
  78. GRB 021008, optical observations
  79. GRB021016(=H2397): A Long GRB Localized by HETE
  80. IPN triangulation of GRB021016 (small error box)
  81. IPN triangulation of GRB021014 (large error box)
  82. IPN triangulation of GRB021013 (single error box)
  83. GRB 021004: optical spectroscopy on Oct 11
  84. IPN triangulation of GRB021013 (two small error boxes)
  85. GRB021004: High-resolution optical spectroscopy
  86. IPN triangulation of GRB021013 (annulus)
  87. XRF 020903: flattening of the optical light curve.
  88. GRB021004, UBVRcIc field photometry update
  89. IPN triangulation of GRB021008 (single error box)
  90. IPN triangulation of GRB021008B (annulus)
  91. IPN triangulation of GRB021008 (two small error boxes)
  92. GRB021004 Chandra HETG Observations
  93. GRB 021004: Optical/NIR Observations
  94. GRB 021004: Additional V-band Polarimetric Observations
  95. GRB021004: optical observation
  96. GRB 021004: WC wind?
  97. GRB021004: NIR and Optical observations
  98. GRB 021004: Optical measurement at OHP
  99. GRB 021004: Optical observations, AUDE network
  100. GRB 021004: optical spectroscopy

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