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"

42638 results found.

  1. GRB 031026: Further Ic Observations
  2. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  3. Peculiar Type Ic SN 2003jd (SN/GRB?), optical spectrum
  4. IPN triangulation of GRB031024 (single error box)
  5. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  6. GRB 031026: Ic Observations
  7. IPN triangulation of GRB031024 (annulus)
  8. IPN triangulation of GRB031020 (large error box)
  9. GRB030329: radio observations at RT-22 (CrAO)
  10. IPN triangulation of GRB031016 (two large error boxes)
  11. IBAS alert 1180 refers to a burst from SGR 1806-20
  12. HETE Prompt GRB Light Curves and Color-Color Diagrams
  13. IPN triangulation of GRB031014 (annulus)
  14. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  15. XRF 030824: additional observations at CFHT
  16. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  17. IPN triangulation of GRB031008 (annulus)
  18. IPN detection of continued activity from SGR1806-20
  19. IPN triangulation of GRB031007 (two large error boxes)
  20. XRF 030723: Subaru Optical Observations
  21. IPN triangulation of GRB031004B (annulus)
  22. IPN triangulation of GRB031004A (short/hard; annulus)
  23. IPN triangulation of GRB030929 (short/hard; annulus)
  24. A burst from SGR 1806-20 detected with IBAS
  25. XRF 030824: observations at CFHT
  26. IPN triangulation of GRB030926 (short/hard; large error box)
  27. IPN triangulation of GRB030922B (large error box)
  28. XRF 030723: Detection of the likely host galaxy
  29. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  30. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  31. IPN triangulation of GRB030922A (large error box)
  32. IPN triangulation of GRB030921 (large error box)
  33. IPN triangulation of GRB030919 (large error box)
  34. GRB030922 triangulation (annulus)
  35. GRB030913: Subaru Optical Observations
  36. GRB 030913: ROTSE-3c Optical Observations
  37. GRB030913: OT's limit by MASTER
  38. GRB030921 triangulation (annulus)
  39. GRB030913, candidate afterglow observations
  40. GRB 030913, optical candidate
  41. GRB030913: AAVSO optical observations
  42. GRB030913 (=H2849): Confirmation of the Flight Localization
  43. IPN triangulation of GRB030916 (possible short/hard GRB; large error box)
  44. GRB030913 (=H2849): TAROT Observations
  45. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  46. Magellan Observations of GRB030725 (=H2779)
  47. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  48. IPN triangulation of GRB030908 (annulus)
  49. GRB 030913: Optical limit at RIKEN
  50. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  51. XRF030824: Optical observations
  52. IPN triangulation of GRB030903 (large error box)
  53. IBAS detection of bursts from SGR 1806-20
  54. Radio Observations of SGR1806-20
  55. IPN triangulation of GRB030831 (annulus)
  56. IPN triangulation of GRB030830 (large error box)
  57. GRB 030824: Candidate Follow-Up
  58. INTEGRAL ToO OBSERVATIONS OF SGR1806-20: CALL FOR CORRELATED OBSERVATIONS
  59. IPN triangulation of GRB030827 (large error box)
  60. GRB 030823 observation at Ouda
  61. XRF030824: Second-epoch Palomar observations
  62. IPN triangulation of GRB030822 (annulus)
  63. GRB030823: optical observations
  64. GRB030823: Palomar observations
  65. XRF030824: Palomar observations
  66. GRB 030824: Candidate Afterglow (or Variable/Flare Star?)
  67. GRB030823: optical observation at Tokyo Tech
  68. RAPTOR observations of GRB030823
  69. IPN triangulation of GRB030821 (=H2814; refined error box)
  70. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  71. Summary of recent IPN and HETE detections of SGR bursts
  72. IPN triangulation of GRB030814 (annulus)
  73. IPN detection of continued activity from SGR1806-20
  74. 030813 SGR event (Konus-Wind observation)
  75. GRB 030817 = H2808 TAROT optical observations
  76. SGR 1808-20 (=H2802): A Possible new SGR
  77. GRB 021206 Optical Observations
  78. IPN triangulation of GRB030808 (two large error boxes)
  79. IPN triangulation of GRB030806 (large burst; large error box)
  80. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  81. IPN/HETE summary of recent bursts from SGR1806-20
  82. XRF 030723: Detection of a rebrightening in the optical afterglow
  83. GRB030725: Optical observations
  84. XRF030723, BVRcIc field photometry update
  85. IPN triangulation of GRB030801 (large error box)
  86. GRB021206 optical counterpart upper limit
  87. IPN triangulation of GRB030731 (annulus)
  88. IBAS GRB Alerts 1011-1017 NOT CONFIRMED
  89. XRF030723: Re-analysis of ROTSE-III early images
  90. IPN triangulation of GRB030725 (=H2779; small error box)
  91. XRF030723 (=H2777): Second Epoch Magellan Observations
  92. GRB 030725: optical observations.
  93. GRB030725, optical transient observations
  94. IPN triangulation of GRB030726 (large error box)
  95. IPN triangulation of GRB030722 (large error box)
  96. IPN triangulation of GRB030721 (large error box)
  97. XRF030723 Radio Observations
  98. XRF 030723: confirmation of fading optical counterpart
  99. XRF030723(=H2777): Chandra Observations
  100. XRF 030723: VLT spectra

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