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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"

26390 results found.

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

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