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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"

28057 results found.

  1. IPN triangulation of GRB021016 (small error box)
  2. IPN triangulation of GRB021014 (large error box)
  3. IPN triangulation of GRB021013 (single error box)
  4. GRB 021004: optical spectroscopy on Oct 11
  5. IPN triangulation of GRB021013 (two small error boxes)
  6. GRB021004: High-resolution optical spectroscopy
  7. XRF 020903: flattening of the optical light curve.
  8. GRB021004, UBVRcIc field photometry update
  9. IPN triangulation of GRB021008 (single error box)
  10. GRB 021004 submm observations
  11. IPN triangulation of GRB021008 (two small error boxes)
  12. GRB021004 Chandra HETG Observations
  13. GRB 021004: Optical/NIR Observations
  14. GRB 021004: Additional V-band Polarimetric Observations
  15. GRB021004: optical observation
  16. GRB 021004: Host Galaxy Star Formation Rate
  17. GRB 021004 submm observations
  18. GRB 021004: WC wind?
  19. GRB021004: NIR and Optical observations
  20. GRB 021004: Optical observations, AUDE network
  21. GRB 021004 - VLA Radio Observations
  22. GRB 021004 - Unusual Radio-to-Submm Spectrum
  23. GRB 021004: optical spectroscopy
  24. IPN triangulation of GRB021007 (annulus)
  25. GRB021004: optical observations and predicted break time
  26. GRB021004: BVRc photometry
  27. GRB021004 radio observation
  28. HETE fluences for GRB021004
  29. GRB 021004: Optical Photometry at 2.5 Days
  30. GRB 021004: polarimetric observations
  31. GRB 021004: V-band Polarimetric Observations
  32. GRB021004: Update Bisei photometric data
  33. IRAM Millimeter detection of GRB 021004
  34. GRB 021004 radio observation
  35. GRB 021004: Optical Photometry at 1.5 Days
  36. GRB021004, BVRcIc field photometry
  37. GRB021004: Optical Spectroscopy
  38. GRB 021004 radio search
  39. XRF020903, BVRI field photometry
  40. XRF020903: TNG and Asiago photometry
  41. GRB 020903: Optical observations at RIKEN
  42. XRF 020903: Correction to GCN 1560
  43. XRF 020903: VRI observations
  44. XRF 020903: R band observations
  45. XRF 020903: Archival Optical Images
  46. Radio Observations of XRF 020903: The Missing Link
  47. XRF 020903: Supernova
  48. IPN triangulation of GRB020923 (two error boxes)
  49. IPN triangulation of GRB020914B
  50. IPN triangulation of GRB020911 (2 large error boxes)
  51. GRB 020305: HST/STIS observations
  52. Confirmation of IPN error box for GRB020910
  53. IPN triangulation of GRB020910
  54. IPN GCN Circulars now to be issued without restriction
  55. Single IPN error box for GRB020904
  56. XRF 020903: optical observation at Kyoto
  57. GRB020322 : HST/STIS observations
  58. XRF 020903: Optical observations
  59. IPN triangulation of GRB020904
  60. INTEGRAL GRBs added to GCN
  61. SGR1900+14 burst localized by HETE
  62. GRB020813: High-resolution optical spectroscopy
  63. GRB020812: negative optical observations
  64. GRB 020812: optical observation at Kyoto University
  65. Second epoch K band imaging of GRB 020819
  66. GRB 020813 : HST observations
  67. GRB 020812: early time optical observation at Ouda Station
  68. GRB020813: Magellan BVRI Photometry
  69. GRB 020819: Optical observations
  70. K band observation of GRB 020819
  71. GRB020813: optical and NIR observations
  72. GRB020813: Fading X-ray Afterglow Observed with Chandra
  73. GRB020813, UBVRI field calibration
  74. GRB020812: NIR observations
  75. Polarimetry of GRB020813: evidence for variability
  76. GRB020813 IRAM millimeter observations
  77. GRB020812: optical observations
  78. GRB020813: High-Resolution Optical Observations
  79. GRB 020812: optical observation at Bisei
  80. GRB020813: Early Time Magnitude
  81. Millimeter observation of GRB 020813
  82. GRB020812: optical observations
  83. GRB 020813 : KISO multiband optical observations
  84. GRB020813, optical observations
  85. IPN error box for GRB020813
  86. GRB020813, astrometric position
  87. Spectropolarimetry of GRB 020813
  88. GRB 020812 optical observation
  89. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  90. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  91. HST Imaging of the Host of GRB 011121
  92. GRB020801, optical afterglow candidate
  93. GRB020331: Late-time Optical Light Curve (re-submission)
  94. GRB020331: Late-time Optical Light Curve
  95. IPN triangulation of GRB020714
  96. IPN triangulation of GRB020715 (=GRB150702)
  97. IPN triangulation of GRB020714
  98. IPN triangulation of GRB150702
  99. GRB 020410: Discovery of Probable OT by HST
  100. GRB 020124, HST observations of the fading afterglow

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