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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"

3037 results found.

  1. IPN Summary of SGR1806-20 Activity in 2004
  2. MASTER: HETE Alert 3274 optical observation
  3. GRB040511: Candidate optical/NIR afterglow
  4. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  5. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  6. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  7. GRB040106: refined X-ray transient position
  8. GRB040106, Radio Observations
  9. GRB040106, likely optical afterglow
  10. GRB 040106: Optical observations
  11. XMM-Newton observation of GRB040106
  12. GRB 040106 : Planned XMM-Newton observation
  13. GRB 040106 : a long GRB detected with INTEGRAL
  14. GRB031220: Palomar Observations
  15. GRB 031203: IR NTTobservations do not confirm REM detection
  16. SN 2003jd (SN/GRB?) -- X-ray Observations
  17. IPN triangulation of GRB031016 (two large error boxes)
  18. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  19. IPN triangulation of GRB030921 (large error box)
  20. IPN triangulation of GRB030806 (large burst; large error box)
  21. XRF030723, ROTSE-III Early Observations
  22. XRF030723, optical observations
  23. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  24. IPN triangulation of GRB030715 (two large error boxes)
  25. GRB030329 -- RATAN-600 data in April-May
  26. GRB 030329: Optical limit (contemporaneous imaging)
  27. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM
  28. IPN triangulation of GRB030425 (single error box)
  29. GRB 030329, the review of the sky area in plate archive (1950-1998)
  30. IPN triangulation of GRB030422 (two large error boxes)
  31. GRB030329: 444 AAVSO Measurements
  32. GRB 030329, nearby galaxies
  33. Further AAVSO V,B,R observations of GRB030329
  34. GRB 030329: Correction to GCN 2056
  35. GRB 030329: optical observations
  36. GRB030323, ROTSE-III detection of possible optical counterpart
  37. GRB030323, possible optical counterpart
  38. IPN triangulation of GRB030320 (small error box)
  39. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  40. GRB 030217: Optical Observations at 4, 5, and 6 Days
  41. GRB030131: Kiso Observations
  42. IPN triangulation of GRB030101 (two large error boxes)
  43. GRB021004, late time optical observations
  44. Improved IPN error box for GRB021125
  45. IPN BURST POSITION
  46. IPN triangulation of GRB021125 (INTEGRAL BURST)
  47. GRB021104(=H2434): A Long, X-Ray-Rich GRB Localized by HETE
  48. GRB021104: optical observations
  49. GRB021104: possible optical afterglow
  50. IPN triangulation of GRB021027 (single large error box)
  51. GRB021004, late-time optical observations
  52. GRB 021004: optical observations
  53. IPN triangulation of GRB021020
  54. GRB021016(=H2397): A Long GRB Localized by HETE
  55. IPN triangulation of GRB021016 (small error box)
  56. IPN triangulation of GRB021008 (two small error boxes)
  57. GRB021004: optical observations and predicted break time
  58. GRB021004: BVRc photometry
  59. GRB 021004: optical counterpart
  60. GRB 021004, SPM optical observations
  61. IPN triangulation of GRB020923 (two error boxes)
  62. Confirmation of IPN error box for GRB020910
  63. IPN triangulation of GRB020910
  64. GRB020903(=H2314): An X-Ray Flash Localized by HETE
  65. INTEGRAL GRBs added to GCN
  66. IPN error box for GRB020813
  67. GRB020813: Candidate Optical Afterglow
  68. Correction to IPN error box for GRB020706
  69. GRB 020625, optical observations
  70. GRB 020531: optical photometry of Chandra sources
  71. GRB020604, optical observations
  72. GRB020531: Observations with the Chandra X-ray Observatory
  73. Correction to IPN triangulation of GRB020603 (possible short/hard burst)
  74. GRB 020124: Optical observations
  75. GRB 020331 Kyoto observation on March 31
  76. GRB020317: optical observations
  77. GRB020321 optical observations
  78. IPN Upper Limits to a GRB Associated With SN2002ap
  79. GRB020127: Comparison of Chandra Epochs and Identification of Possible Counterparts
  80. GRB020127: Chandra Observations and Prospective Counterparts
  81. GRB 011211, Optical Observations
  82. GRB011130 (=XRF011130): Further analysis of Chandra Target of
  83. GRB011130 (XRF011130) Chandra Observations
  84. GRB011121: fainter still
  85. BEPPOSAX GRB011121
  86. XRF011030: Chandra Observations
  87. Millimeter observation of SGR 1900+14
  88. IPN Triangulation of GRB010412
  89. GRB010214, candidate optical afterglow
  90. GRB010214 Optical Observation
  91. IPN TRIANGULATION OF GRB010109
  92. IPN TRIANGULATION OF GRB010109
  93. XMM-Newton observation of GRB001025
  94. IPN TRIANGULATION OF GRB001020
  95. IPN TRIANGULATION OF GRB001018
  96. GRB000926 - Amateur Optical Observations
  97. GRB 000926 Chandra Observation
  98. GRB000926: X-ray afterglow by BeppoSAX. Refined analysis
  99. J and K band observations of GRB 000926
  100. GRB000926: X-ray afterglow by BeppoSAX & plan of BSAX & Chandra obs.

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