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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"

37564 results found.

  1. Triangulation of GRB030714 (single large error box)
  2. 030716 NOT a GRB
  3. IPN triangulation of GRB030714 (two large error boxes)
  4. IPN triangulation of GRB030715 (two large error boxes)
  5. GRB030329: RTT150 optical observations
  6. GRBlog: Compilation of all GCN Circ. data
  7. IPN detection of renewed activity from SGR1806-20
  8. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  9. IPN triangulation of GRB030710 (annulus)
  10. IPN triangulation of GRB030709 (annulus)
  11. GRB030706 triangulation (single large error box)
  12. IPN triangulation of GRB030706 (annulus)
  13. IPN triangulation of GRB030629 (annulus)
  14. GRB030629 triangulation (Konus-Wind -- Helicon annulus)
  15. 030629 NOT a real GRB
  16. IPN triangulation of GRB030626 (single large error box)
  17. IPN triangulation of GRB030626 (two large error boxes)
  18. GRB030418: R optical observations
  19. GRB030329 -- RATAN-600 data in April-May
  20. Final IPN error ellipse for GRB021206 (the polarized GRB)
  21. GRB 021206, Radio afterglow candidate
  22. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  23. IPN triangulation of GRB030607 (annulus)
  24. IPN triangulation of GRB030606 (two alternate error boxes)
  25. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  26. IPN triangulation of GRB030605B (annulus)
  27. GRB 030528: Optical Observations
  28. IPN triangulation of GRB030605 (annulus)
  29. GRB 030528: tentative NIR counterpart
  30. GRB 030528, radio observations
  31. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  32. GRB030329, further radio observations at GMRT
  33. GRB030528, BVRI field photometry
  34. IPN triangulation of GRB030601 (annulus)
  35. GRB030528: Chandra TOO Planned
  36. GRB 030519B: optical observations.
  37. GRB 030329: optical observations
  38. GRB 030329/SN 2003dh: Jitter Episode
  39. GRB 030528, Teramo optical observation
  40. GRB 030528 Bisei optical observation
  41. GRB030528 (H2724): A long GRB localized by HETE
  42. GRB 030329: Correction to GCN 2254
  43. GRB 030329: Optical Observations
  44. GRB 030528: Optical observations at RIKEN
  45. GRB 030528 (=H2724) Kyoto optical observation
  46. IPN triangulation of GRB030523B (annulus)
  47. GRB 030416: Optical Observations
  48. GRB 030329: Planned XMM-Newton Observation
  49. IPN triangulation of GRB030523 (annulus)
  50. GRB 030329: optical photometry at various french observatories
  51. GRB 030329: optical photometry at Belesta observatory (France)
  52. GRB 030329/SN 2003dh: Possible increase in brightness
  53. GRB 030329: HST ACS Observations of the Host
  54. GRB 030329 Optical Observations
  55. GRB 021004: HST observations
  56. GRB030324: Further Observations of the Candidate Optical Afterglow
  57. IPN triangulation of GRB030519B=H2716 (small error box)
  58. GRB 030418: Second Epoch Optical Observations with Magellan
  59. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  60. IPN triangulation of GRB030519 (annulus)
  61. IPN triangulation of GRB030518C (annulus)
  62. IPN triangulation of GRB030518B (annulus)
  63. IPN triangulation of GRB030518A (annulus)
  64. IPN triangulation of GRB030514 (annulus)
  65. IPN triangulation of GRB030513 (annulus)
  66. IPN triangulation of GRB030509B (annulus)
  67. GRB 030329: Optical limit (contemporaneous imaging)
  68. GRB 030501: final TAROT limits
  69. IPN triangulation of GRB030509 (small errror box)
  70. IPN triangulation of GRB030509 - correction
  71. IPN triangulation of GRB030509 (single error box)
  72. GRB030329: RTT150 optical observations
  73. GRB 030329: Optical limit (contemporaneous photography)
  74. GRB030418, BVRcIc field photometry
  75. GRB 030429: Redshift of neighbor galaxy
  76. GRB030429, BVRcIc field photometry
  77. GRB 030329: High-Resolution Spectroscopy of the Host
  78. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  79. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  80. GRB030429: RTT150 optical observations, a possible host galaxy
  81. IPN triangulation of GRB030506 (annulus)
  82. IPN triangulation of GRB030505B (large error box)
  83. IPN triangulation of GRB030505A (annulus)
  84. GRB030329: RTT150 optical observations and upper limit for a host
  85. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  86. GRB030501, optical observation
  87. GRB030501C triangulation (annulus)
  88. GRB030329: RTT150 optical observations and upper limit for a host
  89. GRB 030429: Radio Observations
  90. GRB 030429: redshift from VLT spectroscopy
  91. GRB 030429: IR photometry with IRSF/SIRIUS
  92. GRB030501B triangulation (single error box)
  93. GRB 030329 Optical Observations
  94. GRB 030329, BVRI photometry
  95. GRB 030501: TAROT possible candidate counterpart
  96. IPN triangulation of GRB030501 (IBIS event; annulus)
  97. IPN triangulation of GRB030501B (annulus)
  98. GRB 030429: confirmation of afterglow candidate
  99. GRB030429, possible optical counterpart
  100. GRB030501 localized by INTEGRAL

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