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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"

23611 results found.

  1. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  2. IPN triangulation of GRB030908 (annulus)
  3. GRB 030913: Optical limit at RIKEN
  4. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  5. IPN triangulation of GRB030903 (large error box)
  6. Radio Observations of SGR1806-20
  7. IPN triangulation of GRB030831 (annulus)
  8. IPN triangulation of GRB030830 (large error box)
  9. INTEGRAL ToO OBSERVATIONS OF SGR1806-20: CALL FOR CORRELATED OBSERVATIONS
  10. IPN triangulation of GRB030827 (large error box)
  11. GRB 030823 observation at Ouda
  12. IPN triangulation of GRB030822 (annulus)
  13. GRB 030824: Candidate Afterglow (or Variable/Flare Star?)
  14. GRB030823: optical observation at Tokyo Tech
  15. Lulin follow-up observations of GRB030823
  16. IPN triangulation of GRB030821 (=H2814; refined error box)
  17. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  18. Summary of recent IPN and HETE detections of SGR bursts
  19. IPN triangulation of GRB030814 (annulus)
  20. IPN detection of continued activity from SGR1806-20
  21. GRB 030817 = H2808 TAROT optical observations
  22. SGR 1808-20 (=H2802): A Possible new SGR
  23. GRB 021206 Optical Observations
  24. IPN triangulation of GRB030806 (large burst; large error box)
  25. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  26. IPN/HETE summary of recent bursts from SGR1806-20
  27. XRF 030723: Detection of a rebrightening in the optical afterglow
  28. IPN triangulation of GRB030801 (large error box)
  29. GRB021206 optical counterpart upper limit
  30. IPN triangulation of GRB030725 (=H2779; small error box)
  31. GRB 030725: optical observations.
  32. IPN triangulation of GRB030726 (large error box)
  33. IPN triangulation of GRB030721 (large error box)
  34. XRF030723 Radio Observations
  35. XRF 030723: VLT spectra
  36. Magellan Observations of XRF030723 (=H2777)
  37. GRB030723: Upper limits from historical observations
  38. GRB030725 (=H2779): A Bright GRB Localized by HETE
  39. XRF030723: optical observations
  40. XRF030723, ROTSE-III Early Observations
  41. XRF030723, BVRcIc field photometry
  42. XRF 030723, optical observations
  43. XRF030723, optical observations
  44. XRF 030723, optical observations
  45. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  46. Konus-Wind detection of the bursts from SGR1806-20 region
  47. H2768, H2770, and H2771: Three Bursts from SGR1806-20
  48. Triangulation of GRB030715 (single large error box)
  49. Triangulation of GRB030714 (single large error box)
  50. IPN triangulation of GRB030714 (two large error boxes)
  51. IPN triangulation of GRB030715 (two large error boxes)
  52. GRB030329: RTT150 optical observations
  53. GRBlog: Compilation of all GCN Circ. data
  54. IPN detection of renewed activity from SGR1806-20
  55. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  56. IPN triangulation of GRB030626 (single large error box)
  57. IPN triangulation of GRB030626 (two large error boxes)
  58. HETE detection of burst from SGR1806-20
  59. GRB030329 -- RATAN-600 data in April-May
  60. Final IPN error ellipse for GRB021206 (the polarized GRB)
  61. IPN triangulation of GRB030606 (two alternate error boxes)
  62. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  63. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  64. GRB030528, BVRI field photometry
  65. GRB030329, SPM optical observations
  66. GRB 030519B: optical observations.
  67. GRB030528(=H2724): Revised SXC Localization
  68. GRB 030329: optical observations
  69. GRB 030329/SN 2003dh: Jitter Episode
  70. GRB 030528, Teramo optical observation
  71. GRB 030528 Bisei optical observation
  72. GRB030528 (H2724): A long GRB localized by HETE
  73. GRB 030329: Correction to GCN 2254
  74. GRB 030329: Optical Observations
  75. GRB 030528: Optical observations at RIKEN
  76. GRB 030528 (=H2724) Kyoto optical observation
  77. IPN triangulation of GRB030523B (annulus)
  78. GRB 030416: Optical Observations
  79. GRB 030329: optical photometry at various french observatories
  80. GRB 030329: optical photometry at Belesta observatory (France)
  81. GRB030329, Optical observations
  82. GRB 030329/SN 2003dh: Possible increase in brightness
  83. GRB 030329 Optical Observations
  84. GRB030324: Further Observations of the Candidate Optical Afterglow
  85. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  86. IPN triangulation of GRB030519B=H2716 (small error box)
  87. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  88. IPN triangulation of GRB030519 (annulus)
  89. IPN triangulation of GRB030518C (annulus)
  90. IPN triangulation of GRB030518A (annulus)
  91. IPN triangulation of GRB030509 (small errror box)
  92. IPN triangulation of GRB030509 - correction
  93. IPN triangulation of GRB030509 (single error box)
  94. GRB030329: RTT150 optical observations
  95. GRB 030329: Optical limit (contemporaneous photography)
  96. GRB030418, BVRcIc field photometry
  97. GRB030429, BVRcIc field photometry
  98. GRB030429: RTT150 optical obs., correction to GCN 2208
  99. GRB 030329: High-Resolution Spectroscopy of the Host
  100. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC

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