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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"

28062 results found.

  1. IPN triangulation of GRB021023 (small error boc)
  2. GRB 020813; likely host galaxy.
  3. IPN triangulation of GRB021020 (smaller error box)
  4. IPN triangulation of GRB021020
  5. GRB 021008, optical observations
  6. IPN triangulation of GRB021016 (small error box)
  7. IPN triangulation of GRB021014 (large error box)
  8. IPN triangulation of GRB021013 (single error box)
  9. GRB 021004: optical spectroscopy on Oct 11
  10. IPN triangulation of GRB021013 (two small error boxes)
  11. GRB021004: High-resolution optical spectroscopy
  12. XRF 020903: flattening of the optical light curve.
  13. GRB021004, UBVRcIc field photometry update
  14. IPN triangulation of GRB021008 (single error box)
  15. GRB 021004 submm observations
  16. IPN triangulation of GRB021008 (two small error boxes)
  17. GRB021004 Chandra HETG Observations
  18. GRB 021004: Optical/NIR Observations
  19. GRB 021004: Additional V-band Polarimetric Observations
  20. GRB021004: optical observation
  21. GRB 021004: Host Galaxy Star Formation Rate
  22. GRB 021004 submm observations
  23. GRB 021004: WC wind?
  24. GRB021004: NIR and Optical observations
  25. GRB 021004: Optical observations, AUDE network
  26. GRB 021004 - VLA Radio Observations
  27. GRB 021004 - Unusual Radio-to-Submm Spectrum
  28. GRB 021004: optical spectroscopy
  29. IPN triangulation of GRB021007 (annulus)
  30. GRB021004: optical observations and predicted break time
  31. GRB021004: BVRc photometry
  32. GRB021004 radio observation
  33. HETE fluences for GRB021004
  34. GRB 021004: Optical Photometry at 2.5 Days
  35. GRB 021004: polarimetric observations
  36. GRB 021004: V-band Polarimetric Observations
  37. GRB021004: Update Bisei photometric data
  38. IRAM Millimeter detection of GRB 021004
  39. GRB 021004 radio observation
  40. GRB 021004: Optical Photometry at 1.5 Days
  41. GRB021004, BVRcIc field photometry
  42. GRB021004: Optical Spectroscopy
  43. GRB 021004 radio search
  44. XRF020903, BVRI field photometry
  45. XRF020903: TNG and Asiago photometry
  46. GRB 020903: Optical observations at RIKEN
  47. XRF 020903: Correction to GCN 1560
  48. XRF 020903: VRI observations
  49. XRF 020903: R band observations
  50. XRF 020903: Archival Optical Images
  51. Radio Observations of XRF 020903: The Missing Link
  52. XRF 020903: Supernova
  53. IPN triangulation of GRB020923 (two error boxes)
  54. IPN triangulation of GRB020914B
  55. IPN triangulation of GRB020911 (2 large error boxes)
  56. GRB 020305: HST/STIS observations
  57. Confirmation of IPN error box for GRB020910
  58. IPN triangulation of GRB020910
  59. IPN GCN Circulars now to be issued without restriction
  60. Single IPN error box for GRB020904
  61. XRF 020903: optical observation at Kyoto
  62. GRB020322 : HST/STIS observations
  63. XRF 020903: Optical observations
  64. IPN triangulation of GRB020904
  65. INTEGRAL GRBs added to GCN
  66. SGR1900+14 burst localized by HETE
  67. GRB020813: High-resolution optical spectroscopy
  68. GRB020812: negative optical observations
  69. GRB 020812: optical observation at Kyoto University
  70. Second epoch K band imaging of GRB 020819
  71. GRB 020813 : HST observations
  72. GRB 020812: early time optical observation at Ouda Station
  73. GRB020813: Magellan BVRI Photometry
  74. GRB 020819: Optical observations
  75. K band observation of GRB 020819
  76. GRB020813: optical and NIR observations
  77. GRB020813: Fading X-ray Afterglow Observed with Chandra
  78. GRB020813, UBVRI field calibration
  79. GRB020812: NIR observations
  80. Polarimetry of GRB020813: evidence for variability
  81. GRB020813 IRAM millimeter observations
  82. GRB020812: optical observations
  83. GRB020813: High-Resolution Optical Observations
  84. GRB 020812: optical observation at Bisei
  85. GRB020813: Early Time Magnitude
  86. Millimeter observation of GRB 020813
  87. GRB020812: optical observations
  88. GRB 020813 : KISO multiband optical observations
  89. GRB020813, optical observations
  90. IPN error box for GRB020813
  91. GRB020813, astrometric position
  92. Spectropolarimetry of GRB 020813
  93. GRB 020812 optical observation
  94. GRB020812(=H2257): A Long Burst Localized by HETE in Near-Real Time
  95. GRB020801: Imaging of Suggested OT Counterpart at the Magellan
  96. HST Imaging of the Host of GRB 011121
  97. GRB020801, optical afterglow candidate
  98. GRB020331: Late-time Optical Light Curve (re-submission)
  99. GRB020331: Late-time Optical Light Curve
  100. IPN triangulation of GRB020714

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