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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"

45663 results found.

  1. XRF 020903 : HST observations
  2. GRB 021201: Optical Observations
  3. GRB 021211, optical observations
  4. GRB 021211: CTIO observations
  5. GRB021211: Measurement of Early Time Afterglow
  6. VLT spectrum of GRB 021211
  7. IPN triangulation of GRB021211B (two large error boxes)
  8. GRB 021211: early break in light curve
  9. GRB021211, BVRI field photometry
  10. GRB021211: Optical observations in CrAO
  11. GRB 021211, IR observations
  12. GRB 021211, optical observations
  13. GRB 021211: Optical Observations
  14. GRB021211: Kiso Observations
  15. GRB021204: Kiso Observations
  16. GRB 021201, optical observations
  17. GRB 021211: Radio Observations
  18. GRB021211: Optical observations
  19. GRB 021201 (short/hard), NOT observations
  20. SUB-MM SEARCH FOR GRB 021211
  21. Chandra observation of the IPN error box of GRB021201 (short/hard)
  22. GRB 021211 Milagro GeV/TeV Observations
  23. GRB 021211, R- and I-band observations
  24. GRB021211 - Upper limits from recent and historical observations
  25. GRB021211, OT at 108 s
  26. GRB021211 (HETE2493), OT at 143 sec
  27. GRB 021204: I-band Observations
  28. GRB021211 (=H2493): A Bright, Long GRB Localized by HETE-2 in Near-Real Time
  29. HETE 2493: Optical observations
  30. HETE 2493: Optical observations
  31. HETE 2493: Optical candidate
  32. GRB 021204: Optical Observations at RIKEN
  33. GRB 021125: Radio Observations
  34. IPN triangulation of GRB021206 (small error box)
  35. IPN triangulation of GRB021206 (exceptionally bright; annulus only)
  36. IPN detection of renewed activity from SGR1806-20
  37. IPN triangulation of GRB021205 (large error box)
  38. GRB 021104, GRB 021112 and GRB 021113 - Milagro GeV/TeV Observations
  39. GRB021201, BVRcIc field photometry
  40. GRB 021201, Radio Observations
  41. GRB 021201: Optical Observations
  42. GRB 021201: BOOTES simultaneous optical observations
  43. IPN triangulation of GRB021201 (short/hard burst, small error box)
  44. Radio Catalog of GRB Afterglows
  45. GRB021004, late time optical observations
  46. GRB021004 Chandra Observation
  47. IPN detection of continued SGR1900+14 activity
  48. GRB021125 refined position
  49. IPN triangulation of GRB021115 (annulus)
  50. IPN triangulation of GRB021125B (two large error boxes)
  51. IPN triangulation of GRB021119 (large error box)
  52. IPN triangulation of GRB021125B (annulus)
  53. Improved IPN error box for GRB021125
  54. IPN BURST POSITION
  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. GRB021004: Near infrared spectroscopy
  85. GRB021104: Optical Observations
  86. IPN triangulation of GRB021104 (annulus)
  87. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  88. IPN triangulation of bursts from SGR1900+14, November 1-2, 2002
  89. SGR1900+14 activity, November 2-4, 2002
  90. Spectropolarimetry of GRB021004
  91. GRB021104: Optical observations
  92. GRB021104: optical observations
  93. GRB021104: Candidate present in DSS
  94. GRB021104: possible optical afterglow
  95. IPN triangulation of GRB021102 (annulus)
  96. Detection of activity from SGR 1900+14 with the RXTE/PCA
  97. IPN triangulation of a burst from SGR1900+14 on November 01, 2002
  98. IPN triangulation of a burst from SGR1900+14 on October 29 2002
  99. IPN triangulation of GRB021025 (portion of annulus)
  100. IPN triangulation of GRB021027 (single large error box)

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