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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"

27393 results found.

  1. IPN triangulation of GRB021201 (short/hard burst, small error box)
  2. GRB021004, late time optical observations
  3. GRB021004 Chandra Observation
  4. IPN detection of continued SGR1900+14 activity
  5. Improved IPN error box for GRB021125
  6. IPN BURST POSITION
  7. IPN triangulation of GRB021125 (INTEGRAL BURST)
  8. GRB021125 : A long GRB localized by INTEGRAL
  9. IPN confirmation of the reactivation of SGR1900+14
  10. GRB021113, SPI ACS observation
  11. GRB 021112: Afterglow or Variable Star?
  12. GRB021113: optical observations at Bisei
  13. GRB 021113: Evidence for a Dark Optical Afterglow
  14. GRB021112, BVRI field photometry
  15. GRB 021112: Variable Source in R-band search
  16. GRB021112: Optical Observations
  17. IPN triangulation of GRB021113 (=H2449; annulus)
  18. GRB 021113: Optical observations
  19. GRB 021112: RAPTOR Observations
  20. GRB021113 (=H2449): A Long GRB Localized by HETE
  21. GRB021112 (=H2448): A Long GRB Localized by HETE
  22. GRB 021016: Optical Observations
  23. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  24. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  25. SGR1900+14 activity, November 2-4, 2002
  26. GRB021104: optical observations
  27. Detection of activity from SGR 1900+14 with the RXTE/PCA
  28. IPN triangulation of GRB021027 (single large error box)
  29. IPN triangulation of GRB021027 (two large error boxes)
  30. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  31. GRB 021004: optical observations
  32. IPN triangulation of GRB021023 (small error boc)
  33. GRB 020813; likely host galaxy.
  34. IPN triangulation of GRB021020 (smaller error box)
  35. IPN triangulation of GRB021020
  36. GRB 021008, optical observations
  37. IPN triangulation of GRB021016 (small error box)
  38. IPN triangulation of GRB021014 (large error box)
  39. IPN triangulation of GRB021013 (single error box)
  40. GRB 021004: optical spectroscopy on Oct 11
  41. IPN triangulation of GRB021013 (two small error boxes)
  42. GRB021004: High-resolution optical spectroscopy
  43. XRF 020903: flattening of the optical light curve.
  44. GRB021004, UBVRcIc field photometry update
  45. IPN triangulation of GRB021008 (single error box)
  46. GRB 021004 submm observations
  47. IPN triangulation of GRB021008 (two small error boxes)
  48. GRB021004 Chandra HETG Observations
  49. GRB 021004: Optical/NIR Observations
  50. GRB 021004: Additional V-band Polarimetric Observations
  51. GRB021004: optical observation
  52. GRB 021004: Host Galaxy Star Formation Rate
  53. GRB 021004 submm observations
  54. GRB 021004: WC wind?
  55. GRB021004: NIR and Optical observations
  56. GRB 021004: Optical observations, AUDE network
  57. GRB 021004 - VLA Radio Observations
  58. GRB 021004 - Unusual Radio-to-Submm Spectrum
  59. GRB 021004: optical spectroscopy
  60. IPN triangulation of GRB021007 (annulus)
  61. GRB021004: optical observations and predicted break time
  62. GRB021004: BVRc photometry
  63. GRB021004 radio observation
  64. HETE fluences for GRB021004
  65. GRB 021004: Optical Photometry at 2.5 Days
  66. GRB 021004: polarimetric observations
  67. GRB 021004: V-band Polarimetric Observations
  68. GRB021004: Update Bisei photometric data
  69. IRAM Millimeter detection of GRB 021004
  70. GRB 021004 radio observation
  71. GRB 021004: Optical Photometry at 1.5 Days
  72. GRB021004, BVRcIc field photometry
  73. GRB021004: Optical Spectroscopy
  74. GRB 021004 radio search
  75. XRF020903, BVRI field photometry
  76. XRF020903: TNG and Asiago photometry
  77. GRB 020903: Optical observations at RIKEN
  78. XRF 020903: Correction to GCN 1560
  79. XRF 020903: VRI observations
  80. XRF 020903: R band observations
  81. XRF 020903: Archival Optical Images
  82. Radio Observations of XRF 020903: The Missing Link
  83. XRF 020903: Supernova
  84. IPN triangulation of GRB020923 (two error boxes)
  85. IPN triangulation of GRB020914B
  86. IPN triangulation of GRB020911 (2 large error boxes)
  87. GRB 020305: HST/STIS observations
  88. Confirmation of IPN error box for GRB020910
  89. IPN triangulation of GRB020910
  90. IPN GCN Circulars now to be issued without restriction
  91. Single IPN error box for GRB020904
  92. XRF 020903: optical observation at Kyoto
  93. GRB020322 : HST/STIS observations
  94. XRF 020903: Optical observations
  95. IPN triangulation of GRB020904
  96. INTEGRAL GRBs added to GCN
  97. SGR1900+14 burst localized by HETE
  98. GRB020813: High-resolution optical spectroscopy
  99. GRB020812: negative optical observations
  100. GRB 020812: optical observation at Kyoto University

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