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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"

35957 results found.

  1. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  2. IPN triangulation of GRB030710 (annulus)
  3. IPN triangulation of GRB030709 (annulus)
  4. GRB030706 triangulation (single large error box)
  5. IPN triangulation of GRB030706 (annulus)
  6. IPN triangulation of GRB030629 (annulus)
  7. GRB030629 triangulation (Konus-Wind -- Helicon annulus)
  8. 030629 NOT a real GRB
  9. IPN triangulation of GRB030626 (single large error box)
  10. IPN triangulation of GRB030626 (two large error boxes)
  11. GRB030418: R optical observations
  12. GRB030329 -- RATAN-600 data in April-May
  13. Final IPN error ellipse for GRB021206 (the polarized GRB)
  14. GRB 021206, Radio afterglow candidate
  15. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  16. IPN triangulation of GRB030607 (annulus)
  17. IPN triangulation of GRB030606 (two alternate error boxes)
  18. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  19. IPN triangulation of GRB030605B (annulus)
  20. GRB 030528: Optical Observations
  21. IPN triangulation of GRB030605 (annulus)
  22. GRB 030528: tentative NIR counterpart
  23. GRB 030528, radio observations
  24. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  25. GRB030329, further radio observations at GMRT
  26. GRB030528, BVRI field photometry
  27. IPN triangulation of GRB030601 (annulus)
  28. GRB030528: Chandra TOO Planned
  29. GRB 030519B: optical observations.
  30. GRB 030329: optical observations
  31. GRB 030329/SN 2003dh: Jitter Episode
  32. GRB 030528, Teramo optical observation
  33. GRB 030528 Bisei optical observation
  34. GRB030528 (H2724): A long GRB localized by HETE
  35. GRB 030329: Correction to GCN 2254
  36. GRB 030329: Optical Observations
  37. GRB 030528: Optical observations at RIKEN
  38. GRB 030528 (=H2724) Kyoto optical observation
  39. IPN triangulation of GRB030523B (annulus)
  40. GRB 030416: Optical Observations
  41. GRB 030329: Planned XMM-Newton Observation
  42. IPN triangulation of GRB030523 (annulus)
  43. GRB 030329: optical photometry at various french observatories
  44. GRB 030329: optical photometry at Belesta observatory (France)
  45. GRB 030329/SN 2003dh: Possible increase in brightness
  46. GRB 030329: HST ACS Observations of the Host
  47. GRB 030329 Optical Observations
  48. GRB 021004: HST observations
  49. GRB030324: Further Observations of the Candidate Optical Afterglow
  50. IPN triangulation of GRB030519B=H2716 (small error box)
  51. GRB 030418: Second Epoch Optical Observations with Magellan
  52. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  53. IPN triangulation of GRB030519 (annulus)
  54. IPN triangulation of GRB030518C (annulus)
  55. IPN triangulation of GRB030518B (annulus)
  56. IPN triangulation of GRB030518A (annulus)
  57. IPN triangulation of GRB030514 (annulus)
  58. IPN triangulation of GRB030513 (annulus)
  59. IPN triangulation of GRB030509B (annulus)
  60. GRB 030329: Optical limit (contemporaneous imaging)
  61. GRB 030501: final TAROT limits
  62. IPN triangulation of GRB030509 (small errror box)
  63. IPN triangulation of GRB030509 - correction
  64. IPN triangulation of GRB030509 (single error box)
  65. GRB030329: RTT150 optical observations
  66. GRB 030329: Optical limit (contemporaneous photography)
  67. GRB030418, BVRcIc field photometry
  68. GRB 030429: Redshift of neighbor galaxy
  69. GRB030429, BVRcIc field photometry
  70. GRB 030329: High-Resolution Spectroscopy of the Host
  71. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  72. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  73. GRB030429: RTT150 optical observations, a possible host galaxy
  74. IPN triangulation of GRB030506 (annulus)
  75. IPN triangulation of GRB030505B (large error box)
  76. IPN triangulation of GRB030505A (annulus)
  77. GRB030329: RTT150 optical observations and upper limit for a host
  78. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  79. GRB030501, optical observation
  80. GRB030501C triangulation (annulus)
  81. GRB030329: RTT150 optical observations and upper limit for a host
  82. GRB 030429: Radio Observations
  83. GRB 030429: redshift from VLT spectroscopy
  84. GRB 030429: IR photometry with IRSF/SIRIUS
  85. GRB030501B triangulation (single error box)
  86. GRB 030329 Optical Observations
  87. GRB 030329, BVRI photometry
  88. GRB 030501: TAROT possible candidate counterpart
  89. IPN triangulation of GRB030501 (IBIS event; annulus)
  90. IPN triangulation of GRB030501B (annulus)
  91. GRB 030429: confirmation of afterglow candidate
  92. GRB030429, possible optical counterpart
  93. GRB030501 localized by INTEGRAL
  94. GRB030425: CrAO optical observation
  95. IPN triangulation of GRB030429 (annulus)
  96. IPN triangulation of GRB030428 (two large error boxes)
  97. GRB 030329 Oprical observations in Rozhen observatory
  98. GRB 030429: ROTSE-III observations
  99. GRB 030324: Radio Observations
  100. GRB030329 observed as a sudden ionospheric disturbance (SID)

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