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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"

36735 results found.

  1. IPN triangulation of GRB021108 (CORRECTION; TWO LARGE ERROR BOXES)
  2. GRB 021113: Optical observations
  3. GRB 021112: RAPTOR Observations
  4. GRB 021113: Optical Observations
  5. GRB 021113: Optical Observations
  6. GRB021113 (=H2449): A Long GRB Localized by HETE
  7. GRB 021112: Optical Observations
  8. GRB 021112: R-band search
  9. IPN triangulation of GRB021108 (large error box)
  10. GRB021112 (=H2448): A Long GRB Localized by HETE
  11. GRB 021016: Optical Observations
  12. IPN triangulation of GRB021109 (annulus)
  13. IPN triangulation of GRB021108 (annulus)
  14. IPN triangulation of GRB021104 (annulus)
  15. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  16. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  17. SGR1900+14 activity, November 2-4, 2002
  18. GRB021104: Candidate present in DSS
  19. IPN triangulation of GRB021102 (annulus)
  20. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  21. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  22. IPN triangulation of GRB021025 (portion of annulus)
  23. IPN triangulation of GRB021027 (single large error box)
  24. GRB021004, late-time optical observations
  25. IPN triangulation of GRB021027 (two large error boxes)
  26. GRB 021023: Infrared Imaging
  27. IPN triangulation of GRB021027 (annulus)
  28. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  29. IPN triangulation of GRB021025 (annulus)
  30. IPN triangulation of SGR1900+14, October 22 2002
  31. GRB 021004: optical observations
  32. IPN triangulation of GRB021023 (small error boc)
  33. GRB 020813; likely host galaxy.
  34. IPN triangulation of GRB021020 (smaller error box)
  35. IPN triangulation of GRB021020
  36. GRB 021008, radio observations
  37. GRB 021016, optical observations
  38. GRB 021004: VRI observations at TNG: possible break
  39. GRB021016, optical observations
  40. SGR1900+14: burst on October 10 2002
  41. GRB 021008, optical observations
  42. GRB021016(=H2397): A Long GRB Localized by HETE
  43. IPN triangulation of GRB021016 (small error box)
  44. IPN triangulation of GRB021014 (large error box)
  45. IPN triangulation of GRB021013 (single error box)
  46. GRB 021004: optical spectroscopy on Oct 11
  47. IPN triangulation of GRB021013 (two small error boxes)
  48. GRB021004: High-resolution optical spectroscopy
  49. IPN triangulation of GRB021013 (annulus)
  50. GRB021004, UBVRcIc field photometry update
  51. IPN triangulation of GRB021008 (single error box)
  52. GRB 021004 submm observations
  53. IPN triangulation of GRB021008B (annulus)
  54. IPN triangulation of GRB021008 (two small error boxes)
  55. GRB 021004: Optical/NIR Observations
  56. GRB 021004: Additional V-band Polarimetric Observations
  57. GRB021004: optical observation
  58. GRB 021004: Host Galaxy Star Formation Rate
  59. GRB 021004 submm observations
  60. GRB 021004: WC wind?
  61. IPN triangulation of GRB021008
  62. GRB 021004: Optical measurement at OHP
  63. GRB 021004: Optical observations, AUDE network
  64. GRB 021004 - VLA Radio Observations
  65. GRB 021004 - Unusual Radio-to-Submm Spectrum
  66. GRB 021004: optical spectroscopy
  67. IPN triangulation of GRB021007 (annulus)
  68. GRB 021004: HST/STIS spectroscopic observations
  69. GRB021004: optical observations and predicted break time
  70. GRB 021004 redshift
  71. GRB 021004: Optical Decay
  72. GRB 021004 continued IR fading
  73. HETE fluences for GRB021004
  74. GRB 021004, spectroscopic observations
  75. GRB021004: not fading anymore?
  76. GRB 021004: Optical Photometry at 2.5 Days
  77. GRB 021004: polarimetric observations
  78. GRB 021004: V-band Polarimetric Observations
  79. GRB 021004: Optical Decay
  80. GRB021004, astrometric position
  81. GRB021004, Optical Observations
  82. IRAM Millimeter detection of GRB 021004
  83. GRB 021004: Optical observations at RIKEN
  84. GRB 021004 radio observation
  85. GRB 021004: Optical Observations
  86. GRB021004: continued fading
  87. GRB 021004: Optical Photometry at 1.5 Days
  88. GRB021004, Optical Observations
  89. GRB021004, BVRcIc field photometry
  90. GRB 021004: Optical observations
  91. GRB 021004: optical counterpart
  92. GRB 021004, optical observations
  93. GRB021004: Optical Spectroscopy
  94. GRB 021004: Optical Observations
  95. GRB 021004, SPM optical observations
  96. GRB 021004, optical observations
  97. GRB 021004 radio search
  98. GRB 021004: radio observations
  99. GRB 021004: steepening of the optical decay slope
  100. GRB021004: Upper limits from recent and historical observations

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