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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

32568 results found.

  1. GRB 021201, Radio Observations
  2. GRB 021201: Optical Observations
  3. GRB 021201: BOOTES simultaneous optical observations
  4. GRB021004, late time optical observations
  5. GRB021004 Chandra Observation
  6. GRB021125 refined position
  7. IPN triangulation of GRB021125B (two large error boxes)
  8. IPN triangulation of GRB021119 (large error box)
  9. Improved IPN error box for GRB021125
  10. IPN BURST POSITION
  11. IPN confirmation of the reactivation of SGR1900+14
  12. GRB021113, SPI ACS observation
  13. GRB 021112: Afterglow or Variable Star?
  14. GRB021113: optical observations at Bisei
  15. GRB 021113: Evidence for a Dark Optical Afterglow
  16. GRB 021112: Variable Source in R-band search
  17. GRB021112: Optical Observations
  18. IPN triangulation of GRB021109 (portion of annulus)
  19. IPN triangulation of GRB021113 (=H2449; annulus)
  20. IPN triangulation of GRB021108 (CORRECTION; TWO LARGE ERROR BOXES)
  21. GRB 021113: Optical Observations
  22. GRB 021113: Optical Observations
  23. GRB021113 (=H2449): A Long GRB Localized by HETE
  24. GRB 021112: Optical Observations
  25. GRB 021112: R-band search
  26. IPN triangulation of GRB021108 (large error box)
  27. GRB021112 (=H2448): A Long GRB Localized by HETE
  28. GRB 021016: Optical Observations
  29. GRB021004: Near infrared spectroscopy
  30. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  31. Spectropolarimetry of GRB021004
  32. GRB021104: optical observations
  33. GRB021104: Candidate present in DSS
  34. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  35. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  36. IPN triangulation of GRB021025 (portion of annulus)
  37. IPN triangulation of GRB021027 (single large error box)
  38. GRB021004, late-time optical observations
  39. IPN triangulation of GRB021027 (two large error boxes)
  40. GRB 021023: Infrared Imaging
  41. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  42. IPN triangulation of SGR1900+14, October 22 2002
  43. GRB 021004: optical observations
  44. GRB021004: Optical Observations
  45. GRB 020813; likely host galaxy.
  46. IPN triangulation of GRB021020 (smaller error box)
  47. GRB021021(=XRF 021021): An X-ray Flash Localized by HETE
  48. GRB 021008, radio observations
  49. GRB 021016, optical observations
  50. GRB 021004: VRI observations at TNG: possible break
  51. GRB021016, optical observations
  52. GRB 021008, optical observations
  53. GRB021016(=H2397): A Long GRB Localized by HETE
  54. IPN triangulation of GRB021016 (area corrected)
  55. IPN triangulation of GRB021016 (small error box)
  56. GRB021004: Optical Observations
  57. IPN triangulation of GRB021013 (single error box)
  58. GRB 021004: optical spectroscopy on Oct 11
  59. IPN triangulation of GRB021013 (two small error boxes)
  60. GRB021004: High-resolution optical spectroscopy
  61. XRF 020903: flattening of the optical light curve.
  62. GRB021004, UBVRcIc field photometry update
  63. IPN triangulation of GRB021008 (single error box)
  64. GRB021004: Optical Observations
  65. GRB 021004 submm observations
  66. IPN triangulation of GRB021008 (two small error boxes)
  67. GRB 021004: Optical/NIR Observations
  68. GRB 021004: Additional V-band Polarimetric Observations
  69. GRB021004: optical observation
  70. GRB 021004: Host Galaxy Star Formation Rate
  71. GRB 021004 submm observations
  72. GRB 021004: WC wind?
  73. GRB021004: NIR and Optical observations
  74. GRB 021004: Optical measurement at OHP
  75. GRB 021004: Optical observations, AUDE network
  76. GRB 021004 - VLA Radio Observations
  77. GRB 021004 - Unusual Radio-to-Submm Spectrum
  78. XRF 020903 spectrum
  79. GRB021004: optical observations and predicted break time
  80. GRB021004: BVRc photometry
  81. GRB 021004 redshift
  82. GRB021004: restart of optical decay
  83. GRB 021004: Optical Decay
  84. GRB 021004, spectroscopic observations
  85. GRB021004: not fading anymore?
  86. GRB 021004: Optical Photometry at 2.5 Days
  87. GRB 021004: polarimetric observations
  88. GRB 021004: V-band Polarimetric Observations
  89. GRB021004: Update Bisei photometric data
  90. GRB 021004: Optical Decay
  91. GRB021004, astrometric position
  92. GRB021004, Optical Observations
  93. IRAM Millimeter detection of GRB 021004
  94. GRB 021004: Optical observations at RIKEN
  95. GRB 021004 radio observation
  96. GRB 021004: Optical Observations
  97. GRB021004: continued fading
  98. GRB 021004: Optical Photometry at 1.5 Days
  99. GRB021004, Optical Observations
  100. GRB021004, BVRcIc field photometry

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