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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"

38437 results found.

  1. GRB030725 (=H2779): A Bright GRB Localized by HETE
  2. XRF030723: optical observations
  3. XRF030723 (= H2777): Chandra Observations Scheduled
  4. XRF030723, ROTSE-III Early Observations
  5. XRF030723, BVRcIc field photometry
  6. XRF 030723, optical observations
  7. XRF030723, optical observations
  8. XRF 030723, optical observations
  9. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  10. GRB030723, optical observations
  11. Konus-Wind detection of the bursts from SGR1806-20 region
  12. IBAS GRB Alerts 969 970
  13. SGR 1806-20, submm observations
  14. H2768, H2770, and H2771: Three Bursts from SGR1806-20
  15. IPN triangulation of GRB030717 (annulus)
  16. RXTE PCA Observations of SGR1806-20 Region
  17. GRB030329: Subaru Optical Spectroscopy
  18. Triangulation of GRB030715 (single large error box)
  19. Triangulation of GRB030714 (single large error box)
  20. 030716 NOT a GRB
  21. IPN triangulation of GRB030714 (two large error boxes)
  22. IPN triangulation of GRB030715 (two large error boxes)
  23. GRB030329: RTT150 optical observations
  24. GRBlog: Compilation of all GCN Circ. data
  25. IPN detection of renewed activity from SGR1806-20
  26. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  27. IPN triangulation of GRB030710 (annulus)
  28. IPN triangulation of GRB030709 (annulus)
  29. GRB030706 triangulation (single large error box)
  30. IPN triangulation of GRB030706 (annulus)
  31. IPN triangulation of GRB030629 (annulus)
  32. GRB030629 triangulation (Konus-Wind -- Helicon annulus)
  33. 030629 NOT a real GRB
  34. GRB030329, optical observation in May
  35. IPN triangulation of GRB030626 (single large error box)
  36. IPN triangulation of GRB030626 (two large error boxes)
  37. GRB030329: second XMM-Newton observation
  38. GRB030418: R optical observations
  39. HETE detection of burst from SGR1806-20
  40. GRB030329 -- RATAN-600 data in April-May
  41. Final IPN error ellipse for GRB021206 (the polarized GRB)
  42. GRB 021206, Radio afterglow candidate
  43. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  44. IPN triangulation of GRB030607 (annulus)
  45. IPN triangulation of GRB030606 (two alternate error boxes)
  46. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  47. IPN triangulation of GRB030605B (annulus)
  48. GRB 030528: Optical Observations
  49. IPN triangulation of GRB030605 (annulus)
  50. GRB 030528: tentative NIR counterpart
  51. GRB 030528, radio observations
  52. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  53. GRB030329, further radio observations at GMRT
  54. GRB030528, BVRI field photometry
  55. IPN triangulation of GRB030601 (annulus)
  56. GRB030329, SPM optical observations
  57. GRB030528: Chandra TOO Planned
  58. MASTER: optical observation GRB030601
  59. GRB030528(=H2724): Revised SXC Localization
  60. GRB 030528, Teramo optical observation
  61. GRB 030528 Bisei optical observation
  62. GRB030528 (H2724): A long GRB localized by HETE
  63. GRB 030329: Correction to GCN 2254
  64. GRB 030329: Optical Observations
  65. GRB 030528: Optical observations at RIKEN
  66. GRB 030528 (=H2724) Kyoto optical observation
  67. IPN triangulation of GRB030523B (annulus)
  68. GRB 030416: Optical Observations
  69. IPN triangulation of GRB030523 (annulus)
  70. GRB030329, Optical observations
  71. GRB 030329: HST ACS Observations of the Host
  72. GRB 030329 Optical Observations
  73. GRB030329: XMM-Newton observation
  74. GRB 021004: HST observations
  75. GRB030324: Further Observations of the Candidate Optical Afterglow
  76. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  77. IPN triangulation of GRB030519B=H2716 (small error box)
  78. GRB 030418: Second Epoch Optical Observations with Magellan
  79. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  80. IPN triangulation of GRB030519 (annulus)
  81. IPN triangulation of GRB030518C (annulus)
  82. IPN triangulation of GRB030518B (annulus)
  83. IPN triangulation of GRB030518A (annulus)
  84. IPN triangulation of GRB030514 (annulus)
  85. IPN triangulation of GRB030513 (annulus)
  86. IPN triangulation of GRB030509B (annulus)
  87. GRB 030329: Optical limit (contemporaneous imaging)
  88. GRB 030501: final TAROT limits
  89. IPN triangulation of GRB030509 (small errror box)
  90. IPN triangulation of GRB030509 - correction
  91. IPN triangulation of GRB030509 (single error box)
  92. GRB030329: RTT150 optical observations
  93. GRB030329, BVRI photometry
  94. GRB030429, refiend optical brightness
  95. GRB 030329: Optical limit (contemporaneous photography)
  96. GRB030418, BVRcIc field photometry
  97. GRB 030429: Redshift of neighbor galaxy
  98. GRB030429, BVRcIc field photometry
  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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