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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"
  1. GRB021125 : A long GRB localized by INTEGRAL
  2. IPN confirmation of the reactivation of SGR1900+14
  3. IPN detection of possible reactivation of SGR1900+14
  4. GRB021113, SPI ACS observation
  5. IPN triangulation of GRB021119 (annulus)
  6. GRB 021112: Afterglow or Variable Star?
  7. GRB021113: optical observations at Bisei
  8. GRB 021113: Evidence for a Dark Optical Afterglow
  9. GRB 021112, Radio Observations
  10. GRB021112, BVRI field photometry
  11. GRB 021112: Variable Source in R-band search
  12. GRB021112: Optical Observations
  13. GRB021113: Kiso Observations
  14. IPN triangulation of GRB021109 (portion of annulus)
  15. IPN triangulation of GRB021113 (=H2449; annulus)
  16. IPN triangulation of GRB021108 (CORRECTION; TWO LARGE ERROR BOXES)
  17. GRB 021113: Optical observations
  18. GRB 021112: RAPTOR Observations
  19. GRB 021113: Optical Observations
  20. GRB 021113: Optical Observations
  21. GRB021113 (=H2449): A Long GRB Localized by HETE
  22. GRB 021112: Optical Observations
  23. GRB 021112: R-band search
  24. IPN triangulation of GRB021108 (large error box)
  25. GRB021112 (=H2448): A Long GRB Localized by HETE
  26. GRB 021016: Optical Observations
  27. IPN triangulation of GRB021109 (annulus)
  28. IPN triangulation of GRB021108 (annulus)
  29. GRB021004: Near infrared spectroscopy
  30. GRB021104: Optical Observations
  31. IPN triangulation of GRB021104 (annulus)
  32. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  33. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  34. SGR1900+14 activity, November 2-4, 2002
  35. Spectropolarimetry of GRB021004
  36. GRB021104: Optical observations
  37. GRB021104: optical observations
  38. GRB021104: Candidate present in DSS
  39. GRB021104: possible optical afterglow
  40. IPN triangulation of GRB021102 (annulus)
  41. Detection of activity from SGR 1900+14 with the RXTE/PCA
  42. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  43. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  44. IPN triangulation of GRB021025 (portion of annulus)
  45. IPN triangulation of GRB021027 (single large error box)
  46. GRB021004, late-time optical observations
  47. IPN triangulation of GRB021027 (two large error boxes)
  48. GRB 021023: Infrared Imaging
  49. IPN triangulation of GRB021027 (annulus)
  50. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  51. IPN triangulation of GRB021025 (annulus)
  52. IPN triangulation of SGR1900+14, October 22 2002
  53. GRB 021004: optical observations
  54. IPN triangulation of GRB021023 (small error boc)
  55. GRB021004: Optical Observations
  56. GRB 020813; likely host galaxy.
  57. IPN triangulation of GRB021020 (smaller error box)
  58. GRB021021(=XRF 021021): An X-ray Flash Localized by HETE
  59. IPN triangulation of GRB021020
  60. GRB 021008, radio observations
  61. GRB 021016, optical observations
  62. GRB 021004: VRI observations at TNG: possible break
  63. GRB021016, optical observations
  64. SGR1900+14: burst on October 10 2002
  65. GRB 021008, optical observations
  66. GRB021016(=H2397): A Long GRB Localized by HETE
  67. IPN triangulation of GRB021016 (area corrected)
  68. IPN triangulation of GRB021016 (small error box)
  69. GRB021004: Optical Observations
  70. IPN triangulation of GRB021014 (large error box)
  71. IPN triangulation of GRB021013 (single error box)
  72. GRB 021004: optical spectroscopy on Oct 11
  73. IPN triangulation of GRB021013 (two small error boxes)
  74. GRB021004: High-resolution optical spectroscopy
  75. IPN triangulation of GRB021013 (annulus)
  76. XRF 020903: flattening of the optical light curve.
  77. GRB021004, UBVRcIc field photometry update
  78. IPN triangulation of GRB021008 (single error box)
  79. GRB021004: Optical Observations
  80. GRB 021004 submm observations
  81. IPN triangulation of GRB021008B (annulus)
  82. IPN triangulation of GRB021008 (two small error boxes)
  83. GRB021004 Chandra HETG Observations
  84. GRB 021004: Optical/NIR Observations
  85. GRB 021004: Additional V-band Polarimetric Observations
  86. GRB021004: optical observation
  87. GRB 021004: Host Galaxy Star Formation Rate
  88. GRB 021004 submm observations
  89. GRB 021004: WC wind?
  90. IPN triangulation of GRB021008
  91. GRB021004: NIR and Optical observations
  92. GRB 021004: Optical measurement at OHP
  93. GRB 021004: Optical observations, AUDE network
  94. GRB 021004 - VLA Radio Observations
  95. GRB 021004 - Unusual Radio-to-Submm Spectrum
  96. GRB 021004: optical spectroscopy
  97. IPN triangulation of GRB021007 (annulus)
  98. XRF 020903 spectrum
  99. GRB 021004: HST/STIS spectroscopic observations
  100. GRB021004: optical observations and predicted break time

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