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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"

19185 results found.

  1. GRB021113 (=H2449): A Long GRB Localized by HETE
  2. GRB021112 (=H2448): A Long GRB Localized by HETE
  3. GRB 021016: Optical Observations
  4. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  5. SGR1900+14 activity, November 2-4, 2002
  6. GRB021104: optical observations
  7. Detection of activity from SGR 1900+14 with the RXTE/PCA
  8. IPN triangulation of GRB021027 (single large error box)
  9. GRB 021004: optical observations
  10. IPN triangulation of GRB021023 (small error boc)
  11. IPN triangulation of GRB021020 (smaller error box)
  12. IPN triangulation of GRB021020
  13. IPN triangulation of GRB021016 (small error box)
  14. IPN triangulation of GRB021014 (large error box)
  15. IPN triangulation of GRB021013 (single error box)
  16. IPN triangulation of GRB021013 (two small error boxes)
  17. GRB021004: High-resolution optical spectroscopy
  18. XRF 020903: flattening of the optical light curve.
  19. GRB021004, UBVRcIc field photometry update
  20. IPN triangulation of GRB021008 (single error box)
  21. IPN triangulation of GRB021008 (two small error boxes)
  22. GRB021004 Chandra HETG Observations
  23. GRB 021004: Optical/NIR Observations
  24. GRB 021004: Additional V-band Polarimetric Observations
  25. GRB021004: optical observation
  26. GRB 021004: Host Galaxy Star Formation Rate
  27. GRB021004: NIR and Optical observations
  28. GRB 021004: Optical measurement at OHP
  29. GRB 021004: optical spectroscopy
  30. IPN triangulation of GRB021007 (annulus)
  31. GRB021004: BVRc photometry
  32. GRB021004 radio observation
  33. GRB 021004: Optical Photometry at 2.5 Days
  34. GRB 021004: polarimetric observations
  35. GRB 021004: V-band Polarimetric Observations
  36. GRB021004: Update Bisei photometric data
  37. GRB 021004 radio observation
  38. GRB 021004: Optical Observations
  39. GRB 021004: Optical Photometry at 1.5 Days
  40. GRB021004, Optical Observations
  41. GRB021004, BVRcIc field photometry
  42. GRB 021004: Optical observations
  43. GRB 021004: optical counterpart
  44. GRB 021004, optical observations
  45. GRB 021004 radio search
  46. GRB 021004: steepening of the optical decay slope
  47. XRF020903, BVRI field photometry
  48. GRB021004: optical observations at Nyrola
  49. GRB021004: optical observations at Bisei
  50. GRB 021004: Kyoto observation
  51. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  52. XRF020903: TNG and Asiago photometry
  53. GRB 020903: Optical observations at RIKEN
  54. XRF 020903: Correction to GCN 1560
  55. XRF 020903: VRI observations
  56. GRB 020903: correction to GCN 1557
  57. XRF 020903: R band observations
  58. XRF 020903: Supernova
  59. IPN triangulation of GRB020923 (two error boxes)
  60. GRB 020305: HST/STIS observations
  61. Confirmation of IPN error box for GRB020910
  62. IPN triangulation of GRB020910
  63. Single IPN error box for GRB020904
  64. XRF 020903: optical observation at Kyoto
  65. GRB020322 : HST/STIS observations
  66. XRF 020903: Optical observations
  67. IPN triangulation of GRB020904
  68. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  69. INTEGRAL GRBs added to GCN
  70. SGR1900+14 burst localized by HETE
  71. GRB020813: High-resolution optical spectroscopy
  72. GRB020812: negative optical observations
  73. GRB 020812: optical observation at Kyoto University
  74. Second epoch K band imaging of GRB 020819
  75. GRB 020813 : HST observations
  76. GRB 020812: early time optical observation at Ouda Station
  77. GRB020813: VRI Decay Slopes
  78. GRB020813: Magellan BVRI Photometry
  79. GRB 020819: Optical observations
  80. IPN triangulation of GRB020819 (HETE 2275)
  81. GRB020813: optical and NIR observations
  82. GRB020813: Fading X-ray Afterglow Observed with Chandra
  83. GRB020813, UBVRI field calibration
  84. Polarimetry of GRB020813: evidence for variability
  85. GRB020812: optical observations
  86. GRB020813: High-Resolution Optical Observations
  87. GRB 020812: optical observation at Bisei
  88. GRB020812: optical observations
  89. GRB 020813 : KISO multiband optical observations
  90. GRB020813, optical observations
  91. IPN error box for GRB020813
  92. GRB020812: possible afterglow candidate
  93. GRB020812: possible afterglow candidate
  94. GRB020813, astrometric position
  95. GRB020813(=H2262): A Long, Bright Burst Localized by HETE in Near-Real Time
  96. GRB 020812 optical observation
  97. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  98. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  99. HST Imaging of the Host of GRB 011121
  100. GRB020801, optical afterglow candidate

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