Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

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"

37715 results found.

  1. GRB 030824: Candidate Follow-Up
  2. IPN triangulation of GRB030827 (large error box)
  3. GRB 030823 observation at Ouda
  4. XRF030824: Second-epoch Palomar observations
  5. IPN triangulation of GRB030822 (annulus)
  6. GRB030823: Palomar observations
  7. XRF030824: Palomar observations
  8. GRB 030824: Candidate Afterglow (or Variable/Flare Star?)
  9. IPN triangulation of GRB030821 (=H2814; refined error box)
  10. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  11. Summary of recent IPN and HETE detections of SGR bursts
  12. IPN triangulation of GRB030814 (annulus)
  13. IPN detection of continued activity from SGR1806-20
  14. 030813 SGR event (Konus-Wind observation)
  15. GRB 030817 = H2808 TAROT optical observations
  16. SGR 1808-20 (=H2802): A Possible new SGR
  17. GRB 021206 Optical Observations
  18. IPN triangulation of GRB030808 (two large error boxes)
  19. IPN triangulation of GRB030806 (large burst; large error box)
  20. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  21. IPN/HETE summary of recent bursts from SGR1806-20
  22. XRF 030723: Detection of a rebrightening in the optical afterglow
  23. GRB030725: Optical observations
  24. XRF030723, BVRcIc field photometry update
  25. IPN triangulation of GRB030801 (large error box)
  26. GRB021206 optical counterpart upper limit
  27. IPN triangulation of GRB030731 (annulus)
  28. IBAS GRB Alerts 1011-1017 NOT CONFIRMED
  29. IPN triangulation of GRB030725 (=H2779; small error box)
  30. XRF030723 (=H2777): Second Epoch Magellan Observations
  31. GRB 030725: optical observations.
  32. GRB030725, optical transient observations
  33. IPN triangulation of GRB030726 (large error box)
  34. IPN triangulation of GRB030722 (large error box)
  35. IPN triangulation of GRB030721 (large error box)
  36. XRF030723 Radio Observations
  37. XRF030723(=H2777): Chandra Observations
  38. Magellan Observations of XRF030723 (=H2777)
  39. GRB030723: Upper limits from historical observations
  40. GRB030725, possible optical transient
  41. XRF030723: Palomar observations and proposed counterpart
  42. GRB030725 (=H2779): A Bright GRB Localized by HETE
  43. XRF030723: optical observations
  44. XRF030723 (= H2777): Chandra Observations Scheduled
  45. XRF030723, BVRcIc field photometry
  46. XRF030723, optical observations
  47. GRB030723, optical observations
  48. IBAS GRB Alerts 969 970
  49. IPN triangulation of GRB030717 (annulus)
  50. GRB030329: Subaru Optical Spectroscopy
  51. Triangulation of GRB030715 (single large error box)
  52. Triangulation of GRB030714 (single large error box)
  53. 030716 NOT a GRB
  54. IPN triangulation of GRB030714 (two large error boxes)
  55. IPN triangulation of GRB030715 (two large error boxes)
  56. GRB030329: RTT150 optical observations
  57. GRBlog: Compilation of all GCN Circ. data
  58. IPN detection of renewed activity from SGR1806-20
  59. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  60. IPN triangulation of GRB030710 (annulus)
  61. IPN triangulation of GRB030709 (annulus)
  62. GRB030706 triangulation (single large error box)
  63. IPN triangulation of GRB030706 (annulus)
  64. IPN triangulation of GRB030629 (annulus)
  65. GRB030629 triangulation (Konus-Wind -- Helicon annulus)
  66. 030629 NOT a real GRB
  67. IPN triangulation of GRB030626 (single large error box)
  68. IPN triangulation of GRB030626 (two large error boxes)
  69. GRB030418: R optical observations
  70. GRB030329 -- RATAN-600 data in April-May
  71. Final IPN error ellipse for GRB021206 (the polarized GRB)
  72. GRB 021206, Radio afterglow candidate
  73. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  74. IPN triangulation of GRB030607 (annulus)
  75. IPN triangulation of GRB030606 (two alternate error boxes)
  76. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  77. IPN triangulation of GRB030605B (annulus)
  78. GRB 030528: Optical Observations
  79. IPN triangulation of GRB030605 (annulus)
  80. GRB 030528: tentative NIR counterpart
  81. GRB 030528, radio observations
  82. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  83. GRB030329, further radio observations at GMRT
  84. GRB030528, BVRI field photometry
  85. IPN triangulation of GRB030601 (annulus)
  86. GRB030528: Chandra TOO Planned
  87. GRB 030519B: optical observations.
  88. GRB 030329: optical observations
  89. GRB 030329/SN 2003dh: Jitter Episode
  90. GRB 030528, Teramo optical observation
  91. GRB 030528 Bisei optical observation
  92. GRB030528 (H2724): A long GRB localized by HETE
  93. GRB 030329: Correction to GCN 2254
  94. GRB 030329: Optical Observations
  95. GRB 030528: Optical observations at RIKEN
  96. GRB 030528 (=H2724) Kyoto optical observation
  97. IPN triangulation of GRB030523B (annulus)
  98. GRB 030416: Optical Observations
  99. GRB 030329: Planned XMM-Newton Observation
  100. IPN triangulation of GRB030523 (annulus)

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov