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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"

34212 results found.

  1. IPN detection of continued activity from SGR1806-20
  2. 030813 SGR event (Konus-Wind observation)
  3. GRB 030817 = H2808 TAROT optical observations
  4. SGR 1808-20 (=H2802): A Possible new SGR
  5. GRB 021206 Optical Observations
  6. IPN triangulation of GRB030808 (two large error boxes)
  7. IPN triangulation of GRB030806 (large burst; large error box)
  8. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  9. IPN/HETE summary of recent bursts from SGR1806-20
  10. XRF 030723: Detection of a rebrightening in the optical afterglow
  11. GRB030725: Optical observations
  12. XRF030723, BVRcIc field photometry update
  13. IPN triangulation of GRB030801 (large error box)
  14. GRB021206 optical counterpart upper limit
  15. IPN triangulation of GRB030731 (annulus)
  16. IBAS GRB Alerts 1011-1017 NOT CONFIRMED
  17. IPN triangulation of GRB030725 (=H2779; small error box)
  18. XRF030723 (=H2777): Second Epoch Magellan Observations
  19. GRB 030725: optical observations.
  20. GRB030725, optical transient observations
  21. IPN triangulation of GRB030726 (large error box)
  22. IPN triangulation of GRB030722 (large error box)
  23. IPN triangulation of GRB030721 (large error box)
  24. XRF030723 Radio Observations
  25. XRF030723(=H2777): Chandra Observations
  26. XRF 030723: VLT spectra
  27. Magellan Observations of XRF030723 (=H2777)
  28. GRB030723: Upper limits from historical observations
  29. GRB030725, possible optical transient
  30. XRF030723: Palomar observations and proposed counterpart
  31. GRB030725 (=H2779): A Bright GRB Localized by HETE
  32. XRF030723: optical observations
  33. XRF030723 (= H2777): Chandra Observations Scheduled
  34. XRF030723, BVRcIc field photometry
  35. XRF030723, optical observations
  36. GRB030723, optical observations
  37. IBAS GRB Alerts 969 970
  38. IPN triangulation of GRB030717 (annulus)
  39. GRB030329: Subaru Optical Spectroscopy
  40. Triangulation of GRB030715 (single large error box)
  41. Triangulation of GRB030714 (single large error box)
  42. 030716 NOT a GRB
  43. IPN triangulation of GRB030714 (two large error boxes)
  44. IPN triangulation of GRB030715 (two large error boxes)
  45. GRB030329: RTT150 optical observations
  46. GRBlog: Compilation of all GCN Circ. data
  47. IPN detection of renewed activity from SGR1806-20
  48. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  49. IPN triangulation of GRB030710 (annulus)
  50. IPN triangulation of GRB030709 (annulus)
  51. GRB030706 triangulation (single large error box)
  52. IPN triangulation of GRB030706 (annulus)
  53. IPN triangulation of GRB030629 (annulus)
  54. GRB030629 triangulation (Konus-Wind -- Helicon annulus)
  55. 030629 NOT a real GRB
  56. IPN triangulation of GRB030626 (single large error box)
  57. IPN triangulation of GRB030626 (two large error boxes)
  58. GRB030418: R optical observations
  59. GRB030329 -- RATAN-600 data in April-May
  60. Final IPN error ellipse for GRB021206 (the polarized GRB)
  61. GRB 021206, Radio afterglow candidate
  62. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  63. IPN triangulation of GRB030607 (annulus)
  64. IPN triangulation of GRB030606 (two alternate error boxes)
  65. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  66. IPN triangulation of GRB030605B (annulus)
  67. GRB 030528: Optical Observations
  68. IPN triangulation of GRB030605 (annulus)
  69. GRB 030528: tentative NIR counterpart
  70. GRB 030528, radio observations
  71. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  72. GRB030329, further radio observations at GMRT
  73. GRB030528, BVRI field photometry
  74. IPN triangulation of GRB030601 (annulus)
  75. GRB030528: Chandra TOO Planned
  76. GRB 030519B: optical observations.
  77. GRB 030329: optical observations
  78. GRB 030329/SN 2003dh: Jitter Episode
  79. GRB 030528, Teramo optical observation
  80. GRB 030528 Bisei optical observation
  81. GRB030528 (H2724): A long GRB localized by HETE
  82. GRB 030329: Correction to GCN 2254
  83. GRB 030329: Optical Observations
  84. GRB 030528: Optical observations at RIKEN
  85. GRB 030528 (=H2724) Kyoto optical observation
  86. IPN triangulation of GRB030523B (annulus)
  87. GRB 030416: Optical Observations
  88. GRB 030329: Planned XMM-Newton Observation
  89. IPN triangulation of GRB030523 (annulus)
  90. GRB 030329: optical photometry at various french observatories
  91. GRB 030329: optical photometry at Belesta observatory (France)
  92. GRB 030329/SN 2003dh: Possible increase in brightness
  93. GRB 030329: HST ACS Observations of the Host
  94. GRB 030329 Optical Observations
  95. GRB 021004: HST observations
  96. GRB030324: Further Observations of the Candidate Optical Afterglow
  97. IPN triangulation of GRB030519B=H2716 (small error box)
  98. GRB 030418: Second Epoch Optical Observations with Magellan
  99. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  100. IPN triangulation of GRB030519 (annulus)

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