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"

45751 results found.

  1. GRB 021206 Optical Observations
  2. IPN triangulation of GRB030808 (two large error boxes)
  3. IPN triangulation of GRB030806 (large burst; large error box)
  4. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  5. IPN/HETE summary of recent bursts from SGR1806-20
  6. XRF 030723: Detection of a rebrightening in the optical afterglow
  7. GRB030725: Optical observations
  8. XRF030723, BVRcIc field photometry update
  9. IPN triangulation of GRB030801 (large error box)
  10. GRB021206 optical counterpart upper limit
  11. IPN triangulation of GRB030731 (annulus)
  12. IBAS GRB Alerts 1011-1017 NOT CONFIRMED
  13. XRF030723: Re-analysis of ROTSE-III early images
  14. IPN triangulation of GRB030725 (=H2779; small error box)
  15. XRF030723 (=H2777): Second Epoch Magellan Observations
  16. GRB 030725: optical observations.
  17. GRB030725, optical transient observations
  18. IPN triangulation of GRB030726 (large error box)
  19. IPN triangulation of GRB030722 (large error box)
  20. IPN triangulation of GRB030721 (large error box)
  21. XRF030723 Radio Observations
  22. XRF 030723: confirmation of fading optical counterpart
  23. XRF030723(=H2777): Chandra Observations
  24. XRF 030723: VLT spectra
  25. Magellan Observations of XRF030723 (=H2777)
  26. GRB030723: Upper limits from historical observations
  27. GRB030725, possible optical transient
  28. XRF030723: Palomar observations and proposed counterpart
  29. GRB030725 (=H2779): A Bright GRB Localized by HETE
  30. XRF030723: optical observations
  31. XRF030723 (= H2777): Chandra Observations Scheduled
  32. XRF030723, BVRcIc field photometry correction
  33. XRF030723, ROTSE-III Early Observations
  34. XRF030723, BVRcIc field photometry
  35. XRF 030723, optical observations
  36. XRF030723, optical observations
  37. XRF 030723, optical observations
  38. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  39. GRB030723, optical observations
  40. Konus-Wind detection of the bursts from SGR1806-20 region
  41. IBAS GRB Alerts 969 970
  42. SGR 1806-20, submm observations
  43. H2768, H2770, and H2771: Three Bursts from SGR1806-20
  44. IPN triangulation of GRB030717 (annulus)
  45. RXTE PCA Observations of SGR1806-20 Region
  46. GRB030329: Subaru Optical Spectroscopy
  47. Triangulation of GRB030715 (single large error box)
  48. Triangulation of GRB030714 (single large error box)
  49. 030716 NOT a GRB
  50. IPN triangulation of GRB030714 (two large error boxes)
  51. IPN triangulation of GRB030715 (two large error boxes)
  52. GRB030329: RTT150 optical observations
  53. GRBlog: Compilation of all GCN Circ. data
  54. IPN detection of renewed activity from SGR1806-20
  55. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  56. IPN triangulation of GRB030710 (annulus)
  57. IPN triangulation of GRB030709 (annulus)
  58. GRB030706 triangulation (single large error box)
  59. IPN triangulation of GRB030706 (annulus)
  60. IPN triangulation of GRB030629 (annulus)
  61. GRB030629 triangulation (Konus-Wind -- Helicon annulus)
  62. 030629 NOT a real GRB
  63. GRB030329, optical observation in May
  64. IPN triangulation of GRB030626 (single large error box)
  65. IPN triangulation of GRB030626 (two large error boxes)
  66. GRB030329: second XMM-Newton observation
  67. GRB030418: R optical observations
  68. HETE detection of burst from SGR1806-20
  69. GRB030329 -- RATAN-600 data in April-May
  70. Final IPN error ellipse for GRB021206 (the polarized GRB)
  71. GRB 021206, Radio afterglow candidate
  72. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  73. IPN triangulation of GRB030607 (annulus)
  74. IPN triangulation of GRB030606 (two alternate error boxes)
  75. GRB030329, SPM optical observations (Correction of GCN2075 R band)
  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. GRB030329, SPM optical observations
  87. GRB030528: Chandra TOO Planned
  88. GRB 030519B: optical observations.
  89. MASTER: optical observation GRB030601
  90. GRB030528(=H2724): Revised SXC Localization
  91. GRB 030329: optical observations
  92. GRB 030329/SN 2003dh: Jitter Episode
  93. GRB 030528, Teramo optical observation
  94. GRB 030528 Bisei optical observation
  95. GRB030528 (H2724): A long GRB localized by HETE
  96. GRB 030329: Correction to GCN 2254
  97. GRB 030329: Optical Observations
  98. GRB 030528: Optical observations at RIKEN
  99. GRB 030528 (=H2724) Kyoto optical observation
  100. IPN triangulation of GRB030523B (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