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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"

36035 results found.

  1. IPN triangulation of GRB021108 (large error box)
  2. GRB021112 (=H2448): A Long GRB Localized by HETE
  3. GRB 021016: Optical Observations
  4. IPN triangulation of GRB021109 (annulus)
  5. IPN triangulation of GRB021108 (annulus)
  6. GRB021004: Near infrared spectroscopy
  7. IPN triangulation of GRB021104 (annulus)
  8. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  9. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  10. SGR1900+14 activity, November 2-4, 2002
  11. Spectropolarimetry of GRB021004
  12. GRB021104: Candidate present in DSS
  13. IPN triangulation of GRB021102 (annulus)
  14. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  15. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  16. IPN triangulation of GRB021025 (portion of annulus)
  17. IPN triangulation of GRB021027 (single large error box)
  18. GRB021004, late-time optical observations
  19. IPN triangulation of GRB021027 (two large error boxes)
  20. GRB 021023: Infrared Imaging
  21. IPN triangulation of GRB021027 (annulus)
  22. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  23. IPN triangulation of GRB021025 (annulus)
  24. IPN triangulation of SGR1900+14, October 22 2002
  25. GRB 021004: optical observations
  26. IPN triangulation of GRB021023 (small error boc)
  27. GRB 020813; likely host galaxy.
  28. IPN triangulation of GRB021020 (smaller error box)
  29. IPN triangulation of GRB021020
  30. GRB 021008, radio observations
  31. GRB 021016, optical observations
  32. GRB 021004: VRI observations at TNG: possible break
  33. GRB021016, optical observations
  34. SGR1900+14: burst on October 10 2002
  35. GRB 021008, optical observations
  36. GRB021016(=H2397): A Long GRB Localized by HETE
  37. IPN triangulation of GRB021016 (small error box)
  38. IPN triangulation of GRB021014 (large error box)
  39. IPN triangulation of GRB021013 (single error box)
  40. GRB 021004: optical spectroscopy on Oct 11
  41. IPN triangulation of GRB021013 (two small error boxes)
  42. GRB021004: High-resolution optical spectroscopy
  43. IPN triangulation of GRB021013 (annulus)
  44. GRB021004, UBVRcIc field photometry update
  45. IPN triangulation of GRB021008 (single error box)
  46. GRB 021004 submm observations
  47. IPN triangulation of GRB021008B (annulus)
  48. IPN triangulation of GRB021008 (two small error boxes)
  49. GRB 021004: Optical/NIR Observations
  50. GRB 021004: Additional V-band Polarimetric Observations
  51. GRB021004: optical observation
  52. GRB 021004: Host Galaxy Star Formation Rate
  53. GRB 021004 submm observations
  54. GRB 021004: WC wind?
  55. IPN triangulation of GRB021008
  56. GRB 021004: Optical measurement at OHP
  57. GRB 021004: Optical observations, AUDE network
  58. GRB 021004 - VLA Radio Observations
  59. GRB 021004 - Unusual Radio-to-Submm Spectrum
  60. GRB 021004: optical spectroscopy
  61. IPN triangulation of GRB021007 (annulus)
  62. GRB 021004: HST/STIS spectroscopic observations
  63. GRB021004: optical observations and predicted break time
  64. GRB 021004 redshift
  65. GRB 021004: Optical Decay
  66. GRB 021004 continued IR fading
  67. HETE fluences for GRB021004
  68. GRB 021004, spectroscopic observations
  69. GRB021004: not fading anymore?
  70. GRB 021004: Optical Photometry at 2.5 Days
  71. GRB 021004: polarimetric observations
  72. GRB 021004: V-band Polarimetric Observations
  73. GRB 021004: Optical Decay
  74. GRB021004, astrometric position
  75. GRB021004, Optical Observations
  76. IRAM Millimeter detection of GRB 021004
  77. GRB 021004: Optical observations at RIKEN
  78. GRB 021004 radio observation
  79. GRB 021004: Optical Observations
  80. GRB021004: continued fading
  81. GRB 021004: Optical Photometry at 1.5 Days
  82. GRB021004, Optical Observations
  83. GRB021004, BVRcIc field photometry
  84. GRB 021004: Optical observations
  85. GRB 021004: optical counterpart
  86. GRB 021004, optical observations
  87. GRB021004: Optical Spectroscopy
  88. GRB 021004: Optical Observations
  89. GRB 021004, SPM optical observations
  90. GRB 021004, optical observations
  91. GRB 021004 radio search
  92. GRB 021004: radio observations
  93. GRB 021004: steepening of the optical decay slope
  94. GRB021004: Upper limits from recent and historical observations
  95. XRF020903, BVRI field photometry
  96. GRB021004: optical observations at Nyrola
  97. GRB021004: Absorption redshift
  98. GRB 021004: Kyoto observation
  99. GRB021004(=H2380): A Long GRB Localized by HETE in Near-Real Time
  100. GRB021004: Optical Afterglow

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