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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"

3021 results found.

  1. GRB 031203: IR NTTobservations do not confirm REM detection
  2. SN 2003jd (SN/GRB?) -- X-ray Observations
  3. IPN triangulation of GRB031016 (two large error boxes)
  4. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  5. IPN triangulation of GRB030921 (large error box)
  6. IPN triangulation of GRB030806 (large burst; large error box)
  7. XRF030723, ROTSE-III Early Observations
  8. XRF030723, optical observations
  9. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  10. IPN triangulation of GRB030715 (two large error boxes)
  11. GRB030329 -- RATAN-600 data in April-May
  12. GRB 030329: Optical limit (contemporaneous imaging)
  13. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  14. IPN triangulation of GRB030425 (single error box)
  15. GRB 030329, the review of the sky area in plate archive (1950-1998)
  16. IPN triangulation of GRB030422 (two large error boxes)
  17. GRB030329: 444 AAVSO Measurements
  18. GRB 030329, nearby galaxies
  19. Further AAVSO V,B,R observations of GRB030329
  20. GRB 030329: Correction to GCN 2056
  21. GRB 030329: optical observations
  22. GRB030323, ROTSE-III detection of possible optical counterpart
  23. GRB030323, possible optical counterpart
  24. IPN triangulation of GRB030320 (small error box)
  25. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  26. GRB 030217: Optical Observations at 4, 5, and 6 Days
  27. GRB030131: Kiso Observations
  28. IPN triangulation of GRB030101 (two large error boxes)
  29. Improved IPN error box for GRB021125
  30. IPN BURST POSITION
  31. IPN triangulation of GRB021125 (INTEGRAL BURST)
  32. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  33. GRB021104: optical observations
  34. GRB021104: possible optical afterglow
  35. IPN triangulation of GRB021027 (single large error box)
  36. IPN triangulation of GRB021020
  37. GRB021016(=H2397): A Long GRB Localized by HETE
  38. IPN triangulation of GRB021016 (small error box)
  39. IPN triangulation of GRB021008 (two small error boxes)
  40. GRB021004: optical observations and predicted break time
  41. GRB021004: BVRc photometry
  42. GRB 021004: optical counterpart
  43. GRB 021004, SPM optical observations
  44. IPN triangulation of GRB020923 (two error boxes)
  45. IPN triangulation of GRB020914 - clarification and additional information
  46. Confirmation of IPN error box for GRB020910
  47. IPN triangulation of GRB020910
  48. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  49. INTEGRAL GRBs added to GCN
  50. IPN error box for GRB020813
  51. GRB020813: Candidate Optical Afterglow
  52. Correction to IPN error box for GRB020706
  53. GRB 020625, optical observations
  54. GRB 020531: optical photometry of Chandra sources
  55. GRB020604, optical observations
  56. GRB020531: Observations with the Chandra X-ray Observatory
  57. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  58. GRB 020124: Optical observations
  59. GRB 020331 Kyoto observation on March 31
  60. GRB020317: optical observations
  61. GRB020321 optical observations
  62. IPN Upper Limits to a GRB Associated With SN2002ap
  63. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  64. GRB020127: Chandra Observations and Prospective Counterparts
  65. GRB 011211, Optical Observations
  66. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  67. GRB011130 (XRF011130) Chandra Observations
  68. GRB011121: fainter still
  69. BEPPOSAX GRB011121
  70. XRF011030: Chandra Observations
  71. Millimeter observation of SGR 1900+14
  72. IPN Triangulation of GRB010412
  73. GRB010214, candidate optical afterglow
  74. GRB010214 Optical Observation
  75. IPN TRIANGULATION OF GRB010109
  76. IPN TRIANGULATION OF GRB010109
  77. XMM-Newton observation of GRB001025
  78. IPN TRIANGULATION OF GRB001020
  79. IPN TRIANGULATION OF GRB001018
  80. GRB000926 - Amateur Optical Observations
  81. GRB 000926 Chandra Observation
  82. GRB000926: X-ray afterglow by BeppoSAX. Refined analysis
  83. J and K band observations of GRB 000926
  84. GRB000926: X-ray afterglow by BeppoSAX & plan of BSAX & Chandra obs.
  85. GRB 000926, Optical Observation
  86. GRB 000926: Optical candidate
  87. Optical candidate for GRB000926
  88. GRB000911: Sub-millimeter observations
  89. IPN localization of GRB000812
  90. IPN localization of GRB000811
  91. GRB 000630: Detection of the Optical Afterglow
  92. GRB000630, Revised BVRI Field Photometry
  93. GRB000630, Optical Observations
  94. GRB000630: Optical observations
  95. possible optical counterpart of GRB 000630
  96. IPN triangulation of GRB000630
  97. GRB 000408, optical observations
  98. Radio observations of the error box of GRB000301A
  99. GRB000301A [IPN Position]
  100. GRB000226 [IPN Position]

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