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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"

36105 results found.

  1. IPN triangulation of GRB021219 - CORRECTION
  2. IPN triangulation of GRB021219
  3. GRB021219, optical observation by MASTER
  4. GRB021219: Correction to GCN 1766
  5. VLT spectra of GRB 021211 revisited
  6. GRB021219: a long GRB localized by INTEGRAL
  7. IPN detection of continued activity from SGR1806-20
  8. IPN triangulation of GRB021215 (large error box)
  9. IPN triangulation of GRB021214 (annulus)
  10. XRF 020903 : HST observations
  11. GRB 021201: Optical Observations
  12. GRB 021211, optical observations
  13. GRB 021211: CTIO observations
  14. GRB021211: Measurement of Early Time Afterglow
  15. VLT spectrum of GRB 021211
  16. IPN triangulation of GRB021211B (two large error boxes)
  17. GRB 021211: early break in light curve
  18. GRB021211, BVRI field photometry
  19. GRB 021211, IR observations
  20. GRB 021211, optical observations
  21. GRB 021211: Optical Observations
  22. GRB021211: Kiso Observations
  23. GRB021204: Kiso Observations
  24. GRB 021201, optical observations
  25. GRB 021211: Radio Observations
  26. GRB 021201 (short/hard), NOT observations
  27. SUB-MM SEARCH FOR GRB 021211
  28. GRB 021211 Milagro GeV/TeV Observations
  29. GRB 021211, R- and I-band observations
  30. GRB021211 - Upper limits from recent and historical observations
  31. GRB 021204: I-band Observations
  32. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  33. HETE 2493: Optical observations
  34. GRB 021204: Optical Observations at RIKEN
  35. GRB 021125: Radio Observations
  36. IPN triangulation of GRB021206 (small error box)
  37. IPN triangulation of GRB021206 (exceptionally bright; annulus only)
  38. IPN detection of renewed activity from SGR1806-20
  39. IPN triangulation of GRB021205 (large error box)
  40. GRB 021104, GRB 021112 and GRB 021113 - Milagro GeV/TeV Observations
  41. GRB021201, BVRcIc field photometry
  42. GRB 021201, Radio Observations
  43. GRB 021201: Optical Observations
  44. GRB 021201: BOOTES simultaneous optical observations
  45. IPN triangulation of GRB021201 (short/hard burst, small error box)
  46. Radio Catalog of GRB Afterglows
  47. GRB021004, late time optical observations
  48. GRB021004 Chandra Observation
  49. IPN detection of continued SGR1900+14 activity
  50. IPN triangulation of GRB021115 (annulus)
  51. IPN triangulation of GRB021125B (two large error boxes)
  52. IPN triangulation of GRB021119 (large error box)
  53. IPN triangulation of GRB021125B (annulus)
  54. Improved IPN error box for GRB021125
  55. IPN triangulation of GRB021125 (INTEGRAL BURST)
  56. GRB021125 : A long GRB localized by INTEGRAL
  57. IPN confirmation of the reactivation of SGR1900+14
  58. IPN detection of possible reactivation of SGR1900+14
  59. GRB021113, SPI ACS observation
  60. IPN triangulation of GRB021119 (annulus)
  61. GRB 021112: Afterglow or Variable Star?
  62. GRB021113: optical observations at Bisei
  63. GRB 021113: Evidence for a Dark Optical Afterglow
  64. GRB 021112, Radio Observations
  65. GRB021112, BVRI field photometry
  66. GRB 021112: Variable Source in R-band search
  67. GRB021112: Optical Observations
  68. GRB021113: Kiso Observations
  69. IPN triangulation of GRB021109 (portion of annulus)
  70. IPN triangulation of GRB021113 (=H2449; annulus)
  71. IPN triangulation of GRB021108 (CORRECTION; TWO LARGE ERROR BOXES)
  72. GRB 021113: Optical observations
  73. GRB 021112: RAPTOR Observations
  74. GRB 021113: Optical Observations
  75. GRB 021113: Optical Observations
  76. GRB021113 (=H2449): A Long GRB Localized by HETE
  77. GRB 021112: Optical Observations
  78. GRB 021112: R-band search
  79. IPN triangulation of GRB021108 (large error box)
  80. GRB021112 (=H2448): A Long GRB Localized by HETE
  81. GRB 021016: Optical Observations
  82. IPN triangulation of GRB021109 (annulus)
  83. IPN triangulation of GRB021108 (annulus)
  84. IPN triangulation of GRB021104 (annulus)
  85. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  86. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  87. SGR1900+14 activity, November 2-4, 2002
  88. GRB021104: Candidate present in DSS
  89. IPN triangulation of GRB021102 (annulus)
  90. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  91. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  92. IPN triangulation of GRB021025 (portion of annulus)
  93. IPN triangulation of GRB021027 (single large error box)
  94. GRB021004, late-time optical observations
  95. IPN triangulation of GRB021027 (two large error boxes)
  96. GRB 021023: Infrared Imaging
  97. IPN triangulation of GRB021027 (annulus)
  98. GRB 021023: Curious K-band Source(s) Just Outside of IPN Localization
  99. IPN triangulation of GRB021025 (annulus)
  100. IPN triangulation of SGR1900+14, October 22 2002

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