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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"

45679 results found.

  1. XRF 030723, optical observations
  2. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  3. GRB030723, optical observations
  4. Konus-Wind detection of the bursts from SGR1806-20 region
  5. IBAS GRB Alerts 969 970
  6. SGR 1806-20, submm observations
  7. H2768, H2770, and H2771: Three Bursts from SGR1806-20
  8. IPN triangulation of GRB030717 (annulus)
  9. RXTE PCA Observations of SGR1806-20 Region
  10. GRB030329: Subaru Optical Spectroscopy
  11. Triangulation of GRB030715 (single large error box)
  12. Triangulation of GRB030714 (single large error box)
  13. 030716 NOT a GRB
  14. IPN triangulation of GRB030714 (two large error boxes)
  15. IPN triangulation of GRB030715 (two large error boxes)
  16. GRB030329: RTT150 optical observations
  17. GRBlog: Compilation of all GCN Circ. data
  18. IPN detection of renewed activity from SGR1806-20
  19. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  20. IPN triangulation of GRB030710 (annulus)
  21. IPN triangulation of GRB030709 (annulus)
  22. GRB030706 triangulation (single large error box)
  23. IPN triangulation of GRB030706 (annulus)
  24. IPN triangulation of GRB030629 (annulus)
  25. GRB030629 triangulation (Konus-Wind -- Helicon annulus)
  26. 030629 NOT a real GRB
  27. GRB030329, optical observation in May
  28. IPN triangulation of GRB030626 (single large error box)
  29. IPN triangulation of GRB030626 (two large error boxes)
  30. GRB030329: second XMM-Newton observation
  31. GRB030418: R optical observations
  32. HETE detection of burst from SGR1806-20
  33. GRB030329 -- RATAN-600 data in April-May
  34. Final IPN error ellipse for GRB021206 (the polarized GRB)
  35. GRB 021206, Radio afterglow candidate
  36. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  37. IPN triangulation of GRB030607 (annulus)
  38. IPN triangulation of GRB030606 (two alternate error boxes)
  39. GRB030329, SPM optical observations (Correction of GCN2075 R band)
  40. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  41. IPN triangulation of GRB030605B (annulus)
  42. GRB 030528: Optical Observations
  43. IPN triangulation of GRB030605 (annulus)
  44. GRB 030528: tentative NIR counterpart
  45. GRB 030528, radio observations
  46. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  47. GRB030329, further radio observations at GMRT
  48. GRB030528, BVRI field photometry
  49. IPN triangulation of GRB030601 (annulus)
  50. GRB030329, SPM optical observations
  51. GRB030528: Chandra TOO Planned
  52. GRB 030519B: optical observations.
  53. MASTER: optical observation GRB030601
  54. GRB030528(=H2724): Revised SXC Localization
  55. GRB 030329: optical observations
  56. GRB 030329/SN 2003dh: Jitter Episode
  57. GRB 030528, Teramo optical observation
  58. GRB 030528 Bisei optical observation
  59. GRB030528 (H2724): A long GRB localized by HETE
  60. GRB 030329: Correction to GCN 2254
  61. GRB 030329: Optical Observations
  62. GRB 030528: Optical observations at RIKEN
  63. GRB 030528 (=H2724) Kyoto optical observation
  64. IPN triangulation of GRB030523B (annulus)
  65. GRB 030416: Optical Observations
  66. GRB 030329: Planned XMM-Newton Observation
  67. IPN triangulation of GRB030523 (annulus)
  68. GRB 030329: optical photometry at various french observatories
  69. GRB 030329: optical photometry at Belesta observatory (France)
  70. GRB030329, Optical observations
  71. GRB 030329/SN 2003dh: Possible increase in brightness
  72. GRB 030329: HST ACS Observations of the Host
  73. GRB 030329 Optical Observations
  74. GRB030329: XMM-Newton observation
  75. GRB 021004: HST observations
  76. GRB030324: Further Observations of the Candidate Optical Afterglow
  77. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum
  78. IPN triangulation of GRB030519B=H2716 (small error box)
  79. GRB 030418: Second Epoch Optical Observations with Magellan
  80. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  81. IPN triangulation of GRB030519 (annulus)
  82. IPN triangulation of GRB030518C (annulus)
  83. IPN triangulation of GRB030518B (annulus)
  84. IPN triangulation of GRB030518A (annulus)
  85. IPN triangulation of GRB030514 (annulus)
  86. HETE GRB030329, correction to Rc Observations in Loiano
  87. IPN triangulation of GRB030513 (annulus)
  88. IPN triangulation of GRB030509B (annulus)
  89. GRB 030329: Optical limit (contemporaneous imaging)
  90. GRB 030501: final TAROT limits
  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. GRB030329, BVRI photometry
  96. GRB030429, refiend optical brightness
  97. GRB 030329: Optical limit (contemporaneous photography)
  98. GRB030418, BVRcIc field photometry
  99. GRB 030429: Redshift of neighbor galaxy
  100. GRB030429, BVRcIc field photometry

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