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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"

39258 results found.

  1. Probable GRB030112 seen by SPI ACS
  2. Possible GRB030111 seen by SPI ACS
  3. Possible GRB030110b seen by SPI ACS
  4. Possible GRB 030110 seen by SPI ACS
  5. IPN triangulation of GRB030109 (annulus)
  6. IPN triangulation of GRB030105 (large error box)
  7. IPN triangulation of GRB030102B (refined localization - portion of annulus)
  8. Possible GRB 20030109 seen by SPI ACS
  9. IPN triangulation of GRB030102B (portion of annulus)
  10. IPN triangulation of GRB030102A (large error box)
  11. Possible GRB20030107 seen by SPI-ACS
  12. Possible GRB 20030105 seen by SPI ACS
  13. IPN triangulation of GRB030102 (annulus)
  14. GRB on 20030102 seen by SPI-ACS
  15. VLT spectroscopy of the probable host of GRB 021211
  16. GRB on 20030101 seen by SPI-ACS
  17. IPN triangulation of GRB030101 (two large error boxes)
  18. GRB021226
  19. GRB 021211: Probable Host and Underlying Supernova
  20. GRB 021226 registration by Helicon/Coronas-F
  21. Probable GRB in INTEGRAL SPI-ACS
  22. IPN triangulation of GRB021223 (two large error boxes)
  23. GRB021211, radio observations
  24. GRB 021112: Evidence for Another Dark Optical Afterglow
  25. GRB 021219: OSN optical observations
  26. GRB021219: Radio Observations
  27. IPN triangulation of GRB021219 - CORRECTION
  28. IPN triangulation of GRB021219
  29. GRB021219, optical observation by MASTER
  30. GRB021219: Correction to GCN 1766
  31. VLT spectra of GRB 021211 revisited
  32. GRB021219: a long GRB localized by INTEGRAL
  33. IPN detection of continued activity from SGR1806-20
  34. IPN triangulation of GRB021215 (large error box)
  35. IPN triangulation of GRB021214 (annulus)
  36. XRF 020903 : HST observations
  37. GRB 021201: Optical Observations
  38. GRB 021211, optical observations
  39. GRB 021211: CTIO observations
  40. GRB021211: Measurement of Early Time Afterglow
  41. VLT spectrum of GRB 021211
  42. IPN triangulation of GRB021211B (two large error boxes)
  43. GRB 021211: early break in light curve
  44. GRB021211, BVRI field photometry
  45. GRB 021211, IR observations
  46. GRB 021211, optical observations
  47. GRB 021211: Optical Observations
  48. GRB021211: Kiso Observations
  49. GRB021204: Kiso Observations
  50. GRB 021201, optical observations
  51. GRB 021211: Radio Observations
  52. GRB 021201 (short/hard), NOT observations
  53. SUB-MM SEARCH FOR GRB 021211
  54. GRB 021211 Milagro GeV/TeV Observations
  55. GRB 021211, R- and I-band observations
  56. GRB021211 - Upper limits from recent and historical observations
  57. GRB 021204: I-band Observations
  58. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  59. HETE 2493: Optical observations
  60. GRB 021204: Optical Observations at RIKEN
  61. GRB 021125: Radio Observations
  62. IPN triangulation of GRB021206 (small error box)
  63. IPN triangulation of GRB021206 (exceptionally bright; annulus only)
  64. IPN detection of renewed activity from SGR1806-20
  65. IPN triangulation of GRB021205 (large error box)
  66. GRB 021104, GRB 021112 and GRB 021113 - Milagro GeV/TeV Observations
  67. GRB021201, BVRcIc field photometry
  68. GRB 021201, Radio Observations
  69. GRB 021201: Optical Observations
  70. GRB 021201: BOOTES simultaneous optical observations
  71. IPN triangulation of GRB021201 (short/hard burst, small error box)
  72. Radio Catalog of GRB Afterglows
  73. GRB021004, late time optical observations
  74. GRB021004 Chandra Observation
  75. IPN detection of continued SGR1900+14 activity
  76. IPN triangulation of GRB021115 (annulus)
  77. IPN triangulation of GRB021125B (two large error boxes)
  78. IPN triangulation of GRB021119 (large error box)
  79. IPN triangulation of GRB021125B (annulus)
  80. Improved IPN error box for GRB021125
  81. IPN triangulation of GRB021125 (INTEGRAL BURST)
  82. GRB021125 : A long GRB localized by INTEGRAL
  83. IPN confirmation of the reactivation of SGR1900+14
  84. IPN detection of possible reactivation of SGR1900+14
  85. GRB021113, SPI ACS observation
  86. IPN triangulation of GRB021119 (annulus)
  87. GRB 021112: Afterglow or Variable Star?
  88. GRB021113: optical observations at Bisei
  89. GRB 021113: Evidence for a Dark Optical Afterglow
  90. GRB 021112, Radio Observations
  91. GRB021112, BVRI field photometry
  92. GRB 021112: Variable Source in R-band search
  93. GRB021112: Optical Observations
  94. GRB021113: Kiso Observations
  95. IPN triangulation of GRB021109 (portion of annulus)
  96. IPN triangulation of GRB021113 (=H2449; annulus)
  97. IPN triangulation of GRB021108 (CORRECTION; TWO LARGE ERROR BOXES)
  98. GRB 021113: Optical observations
  99. GRB 021112: RAPTOR Observations
  100. GRB 021113: Optical Observations

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