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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

34170 results found.

  1. XRF030723, optical observations
  2. GRB030723, optical observations
  3. IBAS GRB Alerts 969 970
  4. IPN triangulation of GRB030717 (annulus)
  5. GRB030329: Subaru Optical Spectroscopy
  6. Triangulation of GRB030715 (single large error box)
  7. Triangulation of GRB030714 (single large error box)
  8. 030716 NOT a GRB
  9. IPN triangulation of GRB030714 (two large error boxes)
  10. IPN triangulation of GRB030715 (two large error boxes)
  11. GRB030329: RTT150 optical observations
  12. GRBlog: Compilation of all GCN Circ. data
  13. IPN detection of renewed activity from SGR1806-20
  14. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  15. IPN triangulation of GRB030710 (annulus)
  16. IPN triangulation of GRB030709 (annulus)
  17. GRB030706 triangulation (single large error box)
  18. IPN triangulation of GRB030706 (annulus)
  19. IPN triangulation of GRB030629 (annulus)
  20. GRB030629 triangulation (Konus-Wind -- Helicon annulus)
  21. 030629 NOT a real GRB
  22. IPN triangulation of GRB030626 (single large error box)
  23. IPN triangulation of GRB030626 (two large error boxes)
  24. GRB030418: R optical observations
  25. GRB030329 -- RATAN-600 data in April-May
  26. Final IPN error ellipse for GRB021206 (the polarized GRB)
  27. GRB 021206, Radio afterglow candidate
  28. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  29. IPN triangulation of GRB030607 (annulus)
  30. IPN triangulation of GRB030606 (two alternate error boxes)
  31. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  32. IPN triangulation of GRB030605B (annulus)
  33. GRB 030528: Optical Observations
  34. IPN triangulation of GRB030605 (annulus)
  35. GRB 030528: tentative NIR counterpart
  36. GRB 030528, radio observations
  37. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  38. GRB030329, further radio observations at GMRT
  39. GRB030528, BVRI field photometry
  40. IPN triangulation of GRB030601 (annulus)
  41. GRB030528: Chandra TOO Planned
  42. GRB 030519B: optical observations.
  43. GRB 030329: optical observations
  44. GRB 030329/SN 2003dh: Jitter Episode
  45. GRB 030528, Teramo optical observation
  46. GRB 030528 Bisei optical observation
  47. GRB030528 (H2724): A long GRB localized by HETE
  48. GRB 030329: Correction to GCN 2254
  49. GRB 030329: Optical Observations
  50. GRB 030528: Optical observations at RIKEN
  51. GRB 030528 (=H2724) Kyoto optical observation
  52. IPN triangulation of GRB030523B (annulus)
  53. GRB 030416: Optical Observations
  54. GRB 030329: Planned XMM-Newton Observation
  55. IPN triangulation of GRB030523 (annulus)
  56. GRB 030329: optical photometry at various french observatories
  57. GRB 030329: optical photometry at Belesta observatory (France)
  58. GRB 030329/SN 2003dh: Possible increase in brightness
  59. GRB 030329: HST ACS Observations of the Host
  60. GRB 030329 Optical Observations
  61. GRB 021004: HST observations
  62. GRB030324: Further Observations of the Candidate Optical Afterglow
  63. IPN triangulation of GRB030519B=H2716 (small error box)
  64. GRB 030418: Second Epoch Optical Observations with Magellan
  65. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  66. IPN triangulation of GRB030519 (annulus)
  67. IPN triangulation of GRB030518C (annulus)
  68. IPN triangulation of GRB030518B (annulus)
  69. IPN triangulation of GRB030518A (annulus)
  70. IPN triangulation of GRB030514 (annulus)
  71. IPN triangulation of GRB030513 (annulus)
  72. IPN triangulation of GRB030509B (annulus)
  73. GRB 030329: Optical limit (contemporaneous imaging)
  74. GRB 030501: final TAROT limits
  75. IPN triangulation of GRB030509 (small errror box)
  76. IPN triangulation of GRB030509 - correction
  77. IPN triangulation of GRB030509 (single error box)
  78. GRB030329: RTT150 optical observations
  79. GRB 030329: Optical limit (contemporaneous photography)
  80. GRB030418, BVRcIc field photometry
  81. GRB 030429: Redshift of neighbor galaxy
  82. GRB030429, BVRcIc field photometry
  83. GRB 030329: High-Resolution Spectroscopy of the Host
  84. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  85. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  86. GRB030429: RTT150 optical observations, a possible host galaxy
  87. IPN triangulation of GRB030506 (annulus)
  88. IPN triangulation of GRB030505B (large error box)
  89. IPN triangulation of GRB030505A (annulus)
  90. GRB030329: RTT150 optical observations and upper limit for a host
  91. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  92. GRB030501, optical observation
  93. GRB030501C triangulation (annulus)
  94. GRB030329: RTT150 optical observations and upper limit for a host
  95. GRB 030429: Radio Observations
  96. GRB 030429: redshift from VLT spectroscopy
  97. GRB 030429: IR photometry with IRSF/SIRIUS
  98. GRB030501B triangulation (single error box)
  99. GRB 030329 Optical Observations
  100. GRB 030329, BVRI photometry

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