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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"

28088 results found.

  1. IPN BURST POSITION
  2. IPN triangulation of GRB021125 (INTEGRAL BURST)
  3. GRB021125 : A long GRB localized by INTEGRAL
  4. IPN confirmation of the reactivation of SGR1900+14
  5. GRB021113, SPI ACS observation
  6. GRB 021112: Afterglow or Variable Star?
  7. GRB021113: optical observations at Bisei
  8. GRB 021113: Evidence for a Dark Optical Afterglow
  9. GRB021112, BVRI field photometry
  10. GRB 021112: Variable Source in R-band search
  11. GRB021112: Optical Observations
  12. IPN triangulation of GRB021113 (=H2449; annulus)
  13. GRB 021113: Optical observations
  14. GRB 021112: RAPTOR Observations
  15. GRB021113 (=H2449): A Long GRB Localized by HETE
  16. GRB021112 (=H2448): A Long GRB Localized by HETE
  17. GRB 021016: Optical Observations
  18. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  19. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  20. SGR1900+14 activity, November 2-4, 2002
  21. GRB021104: optical observations
  22. Detection of activity from SGR 1900+14 with the RXTE/PCA
  23. IPN triangulation of GRB021027 (single large error box)
  24. IPN triangulation of GRB021027 (two large error boxes)
  25. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  26. GRB 021004: optical observations
  27. IPN triangulation of GRB021023 (small error boc)
  28. GRB 020813; likely host galaxy.
  29. IPN triangulation of GRB021020 (smaller error box)
  30. IPN triangulation of GRB021020
  31. GRB 021008, optical observations
  32. IPN triangulation of GRB021016 (small error box)
  33. IPN triangulation of GRB021014 (large error box)
  34. IPN triangulation of GRB021013 (single error box)
  35. GRB 021004: optical spectroscopy on Oct 11
  36. IPN triangulation of GRB021013 (two small error boxes)
  37. GRB021004: High-resolution optical spectroscopy
  38. XRF 020903: flattening of the optical light curve.
  39. GRB021004, UBVRcIc field photometry update
  40. IPN triangulation of GRB021008 (single error box)
  41. GRB 021004 submm observations
  42. IPN triangulation of GRB021008 (two small error boxes)
  43. GRB021004 Chandra HETG Observations
  44. GRB 021004: Optical/NIR Observations
  45. GRB 021004: Additional V-band Polarimetric Observations
  46. GRB021004: optical observation
  47. GRB 021004: Host Galaxy Star Formation Rate
  48. GRB 021004 submm observations
  49. GRB 021004: WC wind?
  50. GRB021004: NIR and Optical observations
  51. GRB 021004: Optical observations, AUDE network
  52. GRB 021004 - VLA Radio Observations
  53. GRB 021004 - Unusual Radio-to-Submm Spectrum
  54. GRB 021004: optical spectroscopy
  55. IPN triangulation of GRB021007 (annulus)
  56. GRB021004: optical observations and predicted break time
  57. GRB021004: BVRc photometry
  58. GRB021004 radio observation
  59. HETE fluences for GRB021004
  60. GRB 021004: Optical Photometry at 2.5 Days
  61. GRB 021004: polarimetric observations
  62. GRB 021004: V-band Polarimetric Observations
  63. GRB021004: Update Bisei photometric data
  64. IRAM Millimeter detection of GRB 021004
  65. GRB 021004 radio observation
  66. GRB 021004: Optical Photometry at 1.5 Days
  67. GRB021004, BVRcIc field photometry
  68. GRB021004: Optical Spectroscopy
  69. GRB 021004 radio search
  70. XRF020903, BVRI field photometry
  71. XRF020903: TNG and Asiago photometry
  72. GRB 020903: Optical observations at RIKEN
  73. XRF 020903: Correction to GCN 1560
  74. XRF 020903: VRI observations
  75. XRF 020903: R band observations
  76. XRF 020903: Archival Optical Images
  77. Radio Observations of XRF 020903: The Missing Link
  78. XRF 020903: Supernova
  79. IPN triangulation of GRB020923 (two error boxes)
  80. IPN triangulation of GRB020914B
  81. IPN triangulation of GRB020911 (2 large error boxes)
  82. GRB 020305: HST/STIS observations
  83. Confirmation of IPN error box for GRB020910
  84. IPN triangulation of GRB020910
  85. IPN GCN Circulars now to be issued without restriction
  86. Single IPN error box for GRB020904
  87. XRF 020903: optical observation at Kyoto
  88. GRB020322 : HST/STIS observations
  89. XRF 020903: Optical observations
  90. IPN triangulation of GRB020904
  91. INTEGRAL GRBs added to GCN
  92. SGR1900+14 burst localized by HETE
  93. GRB020813: High-resolution optical spectroscopy
  94. GRB020812: negative optical observations
  95. GRB 020812: optical observation at Kyoto University
  96. Second epoch K band imaging of GRB 020819
  97. GRB 020813 : HST observations
  98. GRB 020812: early time optical observation at Ouda Station
  99. GRB020813: Magellan BVRI Photometry
  100. GRB 020819: Optical observations

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