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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"

45673 results found.

  1. IBAS GRB Alerts 969 970
  2. SGR 1806-20, submm observations
  3. H2768, H2770, and H2771: Three Bursts from SGR1806-20
  4. IPN triangulation of GRB030717 (annulus)
  5. RXTE PCA Observations of SGR1806-20 Region
  6. GRB030329: Subaru Optical Spectroscopy
  7. Triangulation of GRB030715 (single large error box)
  8. Triangulation of GRB030714 (single large error box)
  9. 030716 NOT a GRB
  10. IPN triangulation of GRB030714 (two large error boxes)
  11. IPN triangulation of GRB030715 (two large error boxes)
  12. GRB030329: RTT150 optical observations
  13. GRBlog: Compilation of all GCN Circ. data
  14. IPN detection of renewed activity from SGR1806-20
  15. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  16. IPN triangulation of GRB030710 (annulus)
  17. IPN triangulation of GRB030709 (annulus)
  18. GRB030706 triangulation (single large error box)
  19. IPN triangulation of GRB030706 (annulus)
  20. IPN triangulation of GRB030629 (annulus)
  21. GRB030629 triangulation (Konus-Wind -- Helicon annulus)
  22. 030629 NOT a real GRB
  23. GRB030329, optical observation in May
  24. IPN triangulation of GRB030626 (single large error box)
  25. IPN triangulation of GRB030626 (two large error boxes)
  26. GRB030329: second XMM-Newton observation
  27. GRB030418: R optical observations
  28. HETE detection of burst from SGR1806-20
  29. GRB030329 -- RATAN-600 data in April-May
  30. Final IPN error ellipse for GRB021206 (the polarized GRB)
  31. GRB 021206, Radio afterglow candidate
  32. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  33. IPN triangulation of GRB030607 (annulus)
  34. IPN triangulation of GRB030606 (two alternate error boxes)
  35. GRB030329, SPM optical observations (Correction of GCN2075 R band)
  36. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  37. IPN triangulation of GRB030605B (annulus)
  38. GRB 030528: Optical Observations
  39. IPN triangulation of GRB030605 (annulus)
  40. GRB 030528: tentative NIR counterpart
  41. GRB 030528, radio observations
  42. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  43. GRB030329, further radio observations at GMRT
  44. GRB030528, BVRI field photometry
  45. IPN triangulation of GRB030601 (annulus)
  46. GRB030329, SPM optical observations
  47. GRB030528: Chandra TOO Planned
  48. GRB 030519B: optical observations.
  49. MASTER: optical observation GRB030601
  50. GRB030528(=H2724): Revised SXC Localization
  51. GRB 030329: optical observations
  52. GRB 030329/SN 2003dh: Jitter Episode
  53. GRB 030528, Teramo optical observation
  54. GRB 030528 Bisei optical observation
  55. GRB030528 (H2724): A long GRB localized by HETE
  56. GRB 030329: Correction to GCN 2254
  57. GRB 030329: Optical Observations
  58. GRB 030528: Optical observations at RIKEN
  59. GRB 030528 (=H2724) Kyoto optical observation
  60. IPN triangulation of GRB030523B (annulus)
  61. GRB 030416: Optical Observations
  62. GRB 030329: Planned XMM-Newton Observation
  63. IPN triangulation of GRB030523 (annulus)
  64. GRB 030329: optical photometry at various french observatories
  65. GRB 030329: optical photometry at Belesta observatory (France)
  66. GRB030329, Optical observations
  67. GRB 030329/SN 2003dh: Possible increase in brightness
  68. GRB 030329: HST ACS Observations of the Host
  69. GRB 030329 Optical Observations
  70. GRB030329: XMM-Newton observation
  71. GRB 021004: HST observations
  72. GRB030324: Further Observations of the Candidate Optical Afterglow
  73. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  74. IPN triangulation of GRB030519B=H2716 (small error box)
  75. GRB 030418: Second Epoch Optical Observations with Magellan
  76. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  77. IPN triangulation of GRB030519 (annulus)
  78. IPN triangulation of GRB030518C (annulus)
  79. IPN triangulation of GRB030518B (annulus)
  80. IPN triangulation of GRB030518A (annulus)
  81. IPN triangulation of GRB030514 (annulus)
  82. HETE GRB030329, correction to Rc Observations in Loiano
  83. IPN triangulation of GRB030513 (annulus)
  84. IPN triangulation of GRB030509B (annulus)
  85. GRB 030329: Optical limit (contemporaneous imaging)
  86. GRB 030501: final TAROT limits
  87. IPN triangulation of GRB030509 (small errror box)
  88. IPN triangulation of GRB030509 - correction
  89. IPN triangulation of GRB030509 (single error box)
  90. GRB030329: RTT150 optical observations
  91. GRB030329, BVRI photometry
  92. GRB030429, refiend optical brightness
  93. GRB 030329: Optical limit (contemporaneous photography)
  94. GRB030418, BVRcIc field photometry
  95. GRB 030429: Redshift of neighbor galaxy
  96. GRB030429, BVRcIc field photometry
  97. GRB 030329: High-Resolution Spectroscopy of the Host
  98. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  99. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  100. XRF030416 (=U10897): An X-Ray Flash Localized by the HETE WXM

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