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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"

37578 results found.

  1. Magellan Observations of XRF030723 (=H2777)
  2. GRB030723: Upper limits from historical observations
  3. GRB030725, possible optical transient
  4. XRF030723: Palomar observations and proposed counterpart
  5. GRB030725 (=H2779): A Bright GRB Localized by HETE
  6. XRF030723: optical observations
  7. XRF030723 (= H2777): Chandra Observations Scheduled
  8. XRF030723, BVRcIc field photometry
  9. XRF030723, optical observations
  10. GRB030723, optical observations
  11. IBAS GRB Alerts 969 970
  12. IPN triangulation of GRB030717 (annulus)
  13. GRB030329: Subaru Optical Spectroscopy
  14. Triangulation of GRB030715 (single large error box)
  15. Triangulation of GRB030714 (single large error box)
  16. 030716 NOT a GRB
  17. IPN triangulation of GRB030714 (two large error boxes)
  18. IPN triangulation of GRB030715 (two large error boxes)
  19. GRB030329: RTT150 optical observations
  20. GRBlog: Compilation of all GCN Circ. data
  21. IPN detection of renewed activity from SGR1806-20
  22. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  23. IPN triangulation of GRB030710 (annulus)
  24. IPN triangulation of GRB030709 (annulus)
  25. GRB030706 triangulation (single large error box)
  26. IPN triangulation of GRB030706 (annulus)
  27. IPN triangulation of GRB030629 (annulus)
  28. GRB030629 triangulation (Konus-Wind -- Helicon annulus)
  29. 030629 NOT a real GRB
  30. IPN triangulation of GRB030626 (single large error box)
  31. IPN triangulation of GRB030626 (two large error boxes)
  32. GRB030418: R optical observations
  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. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  40. IPN triangulation of GRB030605B (annulus)
  41. GRB 030528: Optical Observations
  42. IPN triangulation of GRB030605 (annulus)
  43. GRB 030528: tentative NIR counterpart
  44. GRB 030528, radio observations
  45. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  46. GRB030329, further radio observations at GMRT
  47. GRB030528, BVRI field photometry
  48. IPN triangulation of GRB030601 (annulus)
  49. GRB030528: Chandra TOO Planned
  50. GRB 030519B: optical observations.
  51. GRB 030329: optical observations
  52. GRB 030329/SN 2003dh: Jitter Episode
  53. GRB 030528, Teramo optical observation
  54. GRB 030528 Bisei optical observation
  55. GRB030528 (H2724): A long GRB localized by HETE
  56. GRB 030329: Correction to GCN 2254
  57. GRB 030329: Optical Observations
  58. GRB 030528: Optical observations at RIKEN
  59. GRB 030528 (=H2724) Kyoto optical observation
  60. IPN triangulation of GRB030523B (annulus)
  61. GRB 030416: Optical Observations
  62. GRB 030329: Planned XMM-Newton Observation
  63. IPN triangulation of GRB030523 (annulus)
  64. GRB 030329: optical photometry at various french observatories
  65. GRB 030329: optical photometry at Belesta observatory (France)
  66. GRB 030329/SN 2003dh: Possible increase in brightness
  67. GRB 030329: HST ACS Observations of the Host
  68. GRB 030329 Optical Observations
  69. GRB 021004: HST observations
  70. GRB030324: Further Observations of the Candidate Optical Afterglow
  71. IPN triangulation of GRB030519B=H2716 (small error box)
  72. GRB 030418: Second Epoch Optical Observations with Magellan
  73. GRB030519B (=H2716): A Long, Bright GRB Localized by the HETE WXM
  74. IPN triangulation of GRB030519 (annulus)
  75. IPN triangulation of GRB030518C (annulus)
  76. IPN triangulation of GRB030518B (annulus)
  77. IPN triangulation of GRB030518A (annulus)
  78. IPN triangulation of GRB030514 (annulus)
  79. IPN triangulation of GRB030513 (annulus)
  80. IPN triangulation of GRB030509B (annulus)
  81. GRB 030329: Optical limit (contemporaneous imaging)
  82. GRB 030501: final TAROT limits
  83. IPN triangulation of GRB030509 (small errror box)
  84. IPN triangulation of GRB030509 - correction
  85. IPN triangulation of GRB030509 (single error box)
  86. GRB030329: RTT150 optical observations
  87. GRB 030329: Optical limit (contemporaneous photography)
  88. GRB030418, BVRcIc field photometry
  89. GRB 030429: Redshift of neighbor galaxy
  90. GRB030429, BVRcIc field photometry
  91. GRB 030329: High-Resolution Spectroscopy of the Host
  92. GRB030429 (=H2695): A Long GRB Localized by the HETE WXM and SXC
  93. GRB030418 (=H2686): A Long, X-Ray-Rich GRB Localized by the HETE WXM
  94. GRB030429: RTT150 optical observations, a possible host galaxy
  95. IPN triangulation of GRB030506 (annulus)
  96. IPN triangulation of GRB030505B (large error box)
  97. IPN triangulation of GRB030505A (annulus)
  98. GRB030329: RTT150 optical observations and upper limit for a host
  99. GRB 030329: all-sky CCD images by K. Shiokawa immediately after the burst
  100. GRB030501, optical observation

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