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"

42296 results found.

  1. GRB 031203: Radio detection
  2. GRB 031203: IR NTTobservations do not confirm REM detection
  3. GRB031203 : Optical Observation of Lulin Observatory
  4. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  5. GRB 031203: Apparent Spectral Break
  6. GRB031203: Planned XMM-Newton observation II
  7. GRB 031203: IR REM Observations
  8. GRB031203: Optical Observations
  9. GRB 031203 XMM-Newton observation
  10. GRB 031203: Optical/IR SMARTS Observations
  11. GRB031203: Planned XMM-Newton observation
  12. IPN triangulation of GRB031127A and B (quasi-simultaneous; large error boxes)
  13. GRB 031203: A long GRB detected with INTEGRAL
  14. IPN triangulation of GRB031130 (large error box)
  15. GRB031111A, prompt optical observations
  16. GRB 031111B (= H2925) : Kyoto Optical Observation
  17. IPN/HETE localization of GRB031109 (=H2917; large error box)
  18. IPN detection of activity from SGR1806-20
  19. GRB 031111, Radio observations
  20. GRB 031111: Optical observations
  21. GRB 031111, optical observations
  22. SN 2003jd (SN/GRB?) -- X-ray Observations
  23. HETE Prompt GRB Spectral Analyses
  24. IPN triangulation of GRB031111 (=H2924): small error box
  25. XRF031109 (=H2919): A very long XRF localized by HETE
  26. IPN triangulation of GRB031108 (large error box)
  27. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  28. GRB030929/SN2003jd association unlikely based on IPN localiztion
  29. Lulin optical follow-up observations of GRB031026
  30. SN 2003jd (SN/GRB?), Radio Observations
  31. SN 2003jd (SN/GRB?) - possible association with GRB 030929
  32. GRB 031026: Further Ic Observations
  33. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  34. Peculiar Type Ic SN 2003jd (SN/GRB?), optical spectrum
  35. IPN triangulation of GRB031024 (single error box)
  36. GRB031026 (=H2882): A Long, Hard Spectrum Burst Localized by HETE
  37. GRB 031026: Ic Observations
  38. GRB031026 : KISO optical follow-up observation
  39. GRB030329: radio observations at RT-22 (CrAO)
  40. HETE Prompt GRB Light Curves and Color-Color Diagrams
  41. Ongoing Bursting Activity from SGR 1806-20 detected with IBAS
  42. XRF 030824: additional observations at CFHT
  43. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  44. SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
  45. IPN detection of continued activity from SGR1806-20
  46. XRF 030723: Subaru Optical Observations
  47. A burst from SGR 1806-20 detected with IBAS
  48. XRF 030824: Early follow-up observation at Kiso observatory
  49. XRF 030824: observations at CFHT
  50. IPN triangulation of GRB030926 (short/hard; large error box)
  51. XRF 030723: Detection of the likely host galaxy
  52. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  53. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  54. IPN triangulation of GRB030922A (large error box)
  55. GRB030913: Subaru Optical Observations
  56. GRB 030913: ROTSE-3c Optical Observations
  57. GRB030913: OT's limit by MASTER
  58. GRB030913, candidate afterglow observations
  59. GRB 030913, optical candidate
  60. GRB030913: AAVSO optical observations
  61. GRB 030913, BOOTES observations
  62. GRB030913 (=H2849): Confirmation of the Flight Localization
  63. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  64. Magellan Observations of GRB030725 (=H2779)
  65. GRB030913 (=H2849): A GRB Possibly Localized by HETE
  66. GRB 030913: Optical limit at RIKEN
  67. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  68. XRF030824: Optical observations
  69. IPN triangulation of GRB030903 (large error box)
  70. IBAS detection of bursts from SGR 1806-20
  71. Radio Observations of SGR1806-20
  72. IPN triangulation of GRB030827 (large error box)
  73. GRB 030823 observation at Ouda
  74. XRF030824: Second-epoch Palomar observations
  75. XRF030824: optical observations
  76. GRB030823: optical observations
  77. GRB030823: Palomar observations
  78. XRF030824: Palomar observations
  79. GRB 030824: Candidate Afterglow (or Variable/Flare Star?)
  80. GRB030823: optical observation at Tokyo Tech
  81. RAPTOR observations of GRB030823
  82. Lulin follow-up observations of GRB030823
  83. IPN triangulation of GRB030821 (=H2814; refined error box)
  84. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  85. IPN triangulation of GRB030814 (annulus)
  86. IPN detection of continued activity from SGR1806-20
  87. 030813 SGR event (Konus-Wind observation)
  88. GRB 030817 = H2808 TAROT optical observations
  89. SGR 1808-20 (=H2802): A Possible new SGR
  90. GRB 021206 Optical Observations
  91. IPN triangulation of GRB030806 (large burst; large error box)
  92. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  93. IPN/HETE summary of recent bursts from SGR1806-20
  94. XRF 030723: Detection of a rebrightening in the optical afterglow
  95. GRB030725: Optical observations
  96. XRF030723, BVRcIc field photometry update
  97. GRB021206 optical counterpart upper limit
  98. XRF030723: Re-analysis of ROTSE-III early images
  99. IPN triangulation of GRB030725 (=H2779; small error box)
  100. XRF030723 (=H2777): Second Epoch Magellan Observations

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