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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"

28086 results found.

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

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