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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"

28097 results found.

  1. IPN triangulation of GRB021206 (small error box)
  2. IPN triangulation of GRB021205 (large error box)
  3. GRB021201, BVRcIc field photometry
  4. GRB 021201: BOOTES simultaneous optical observations
  5. IPN triangulation of GRB021201 (short/hard burst, small error box)
  6. GRB021004, late time optical observations
  7. GRB021004 Chandra Observation
  8. IPN detection of continued SGR1900+14 activity
  9. Improved IPN error box for GRB021125
  10. IPN BURST POSITION
  11. IPN triangulation of GRB021125 (INTEGRAL BURST)
  12. GRB021125 : A long GRB localized by INTEGRAL
  13. IPN confirmation of the reactivation of SGR1900+14
  14. GRB021113, SPI ACS observation
  15. GRB 021112: Afterglow or Variable Star?
  16. GRB021113: optical observations at Bisei
  17. GRB 021113: Evidence for a Dark Optical Afterglow
  18. GRB021112, BVRI field photometry
  19. GRB 021112: Variable Source in R-band search
  20. GRB021112: Optical Observations
  21. IPN triangulation of GRB021113 (=H2449; annulus)
  22. GRB 021113: Optical observations
  23. GRB 021112: RAPTOR Observations
  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. GRB021104: optical observations
  31. Detection of activity from SGR 1900+14 with the RXTE/PCA
  32. IPN triangulation of GRB021027 (single large error box)
  33. IPN triangulation of GRB021027 (two large error boxes)
  34. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  35. GRB 021004: optical observations
  36. IPN triangulation of GRB021023 (small error boc)
  37. GRB 020813; likely host galaxy.
  38. IPN triangulation of GRB021020 (smaller error box)
  39. IPN triangulation of GRB021020
  40. GRB 021008, optical observations
  41. IPN triangulation of GRB021016 (small error box)
  42. IPN triangulation of GRB021014 (large error box)
  43. IPN triangulation of GRB021013 (single error box)
  44. GRB 021004: optical spectroscopy on Oct 11
  45. IPN triangulation of GRB021013 (two small error boxes)
  46. GRB021004: High-resolution optical spectroscopy
  47. XRF 020903: flattening of the optical light curve.
  48. GRB021004, UBVRcIc field photometry update
  49. IPN triangulation of GRB021008 (single error box)
  50. GRB 021004 submm observations
  51. IPN triangulation of GRB021008 (two small error boxes)
  52. GRB021004 Chandra HETG Observations
  53. GRB 021004: Optical/NIR Observations
  54. GRB 021004: Additional V-band Polarimetric Observations
  55. GRB021004: optical observation
  56. GRB 021004: Host Galaxy Star Formation Rate
  57. GRB 021004 submm observations
  58. GRB 021004: WC wind?
  59. GRB021004: NIR and Optical observations
  60. GRB 021004: Optical observations, AUDE network
  61. GRB 021004 - VLA Radio Observations
  62. GRB 021004 - Unusual Radio-to-Submm Spectrum
  63. GRB 021004: optical spectroscopy
  64. IPN triangulation of GRB021007 (annulus)
  65. GRB021004: optical observations and predicted break time
  66. GRB021004: BVRc photometry
  67. GRB021004 radio observation
  68. HETE fluences for GRB021004
  69. GRB 021004: Optical Photometry at 2.5 Days
  70. GRB 021004: polarimetric observations
  71. GRB 021004: V-band Polarimetric Observations
  72. GRB021004: Update Bisei photometric data
  73. IRAM Millimeter detection of GRB 021004
  74. GRB 021004 radio observation
  75. GRB 021004: Optical Photometry at 1.5 Days
  76. GRB021004, BVRcIc field photometry
  77. GRB021004: Optical Spectroscopy
  78. GRB 021004 radio search
  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: R band observations
  85. XRF 020903: Archival Optical Images
  86. Radio Observations of XRF 020903: The Missing Link
  87. XRF 020903: Supernova
  88. IPN triangulation of GRB020923 (two error boxes)
  89. IPN triangulation of GRB020914B
  90. IPN triangulation of GRB020911 (2 large error boxes)
  91. GRB 020305: HST/STIS observations
  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. XRF 020903: optical observation at Kyoto
  97. GRB020322 : HST/STIS observations
  98. XRF 020903: Optical observations
  99. IPN triangulation of GRB020904
  100. INTEGRAL GRBs added to GCN

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