Skip to main content
New! BOOM Notices and Schema v7.0.0. See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

27391 results found.

  1. XMM-Newton Observation of GRB031203
  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. GRB031203: Planned XMM-Newton observation
  11. GRB 031203: further analysis of INTEGRAL data
  12. GRB 030329: Planned XMM-Newton Observation
  13. GRB 031111B (= H2925) : Kyoto Optical Observation
  14. IPN triangulation of GRB031114 (large error box)
  15. GRB 031111, optical observations
  16. GRB031026: 1.2mm upper limit with MAMBO at the IRAM 30m
  17. GRB030929/SN2003jd association unlikely based on IPN localiztion
  18. IPN triangulation of GRB031027 (small error box)
  19. Lulin optical follow-up observations of GRB031026
  20. GRB 031026 (=H2882): Evidence for High Redshift from Prompt
  21. IPN triangulation of GRB031024 (single error box)
  22. IPN triangulation of GRB031024 (annulus)
  23. IPN triangulation of GRB031020 (large error box)
  24. XRF 030824: additional observations at CFHT
  25. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  26. XRF 030723: Subaru Optical Observations
  27. XRF 030824: Early follow-up observation at Kiso observatory
  28. XRF 030824: observations at CFHT
  29. IPN triangulation of GRB030922B (large error box)
  30. XRF 030723: Detection of the likely host galaxy
  31. XRF030824 (=H2821): An X-Ray Flash Localized by the HETE WXM
  32. XRF030823 (=H2818): An X-Ray Flash Localized by the HETE WXM and SXC
  33. IPN triangulation of GRB030921 (large error box)
  34. IPN triangulation of GRB030919 (large error box)
  35. GRB030913: Subaru Optical Observations
  36. GRB 030913, optical candidate
  37. GRB 030913, BOOTES observations
  38. IPN triangulation of GRB030916 (possible short/hard GRB; large error box)
  39. GRB030913: wide field imaging (7 sq.deg) of the error box by MASTER
  40. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  41. XRF030824: Optical observations
  42. IPN triangulation of GRB030903 (large error box)
  43. IPN triangulation of GRB030827 (large error box)
  44. GRB030823: optical observations
  45. GRB030823: optical observation at Tokyo Tech
  46. Lulin follow-up observations of GRB030823
  47. GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN
  48. IPN detection of continued activity from SGR1806-20
  49. GRB 030817 = H2808 TAROT optical observations
  50. SGR 1808-20 (=H2802): A Possible new SGR
  51. XRF030723(=H2777): Chandra Fading X-ray Afterglow Confirmed
  52. XRF 030723: Detection of a rebrightening in the optical afterglow
  53. XRF030723, BVRcIc field photometry update
  54. IPN triangulation of GRB030801 (large error box)
  55. GRB021206 optical counterpart upper limit
  56. IPN triangulation of GRB030726 (large error box)
  57. IPN triangulation of GRB030721 (large error box)
  58. XRF030723 Radio Observations
  59. XRF 030723: confirmation of fading optical counterpart
  60. XRF030723(=H2777): Chandra Observations
  61. GRB030723: Upper limits from historical observations
  62. XRF030723: Palomar observations and proposed counterpart
  63. GRB030725 (=H2779): A Bright GRB Localized by HETE
  64. XRF030723 (= H2777): Chandra Observations Scheduled
  65. XRF030723, BVRcIc field photometry correction
  66. XRF030723, ROTSE-III Early Observations
  67. XRF030723, BVRcIc field photometry
  68. XRF 030723, optical observations
  69. XRF030723 (=H2777): An X-ray Flash Localized by the HETE WXM and
  70. Konus-Wind detection of the bursts from SGR1806-20 region
  71. SGR 1806-20, submm observations
  72. RXTE PCA Observations of SGR1806-20 Region
  73. IPN triangulation of GRB030714 (two large error boxes)
  74. IPN triangulation of GRB030715 (two large error boxes)
  75. GRB030706 triangulation (single large error box)
  76. GRB030329, optical observation in May
  77. IPN triangulation of GRB030626 (single large error box)
  78. IPN triangulation of GRB030626 (two large error boxes)
  79. GRB030329: second XMM-Newton observation
  80. GRB030329 -- RATAN-600 data in April-May
  81. GRB030528(=H2724): X-ray Afterglow Identified in Second Epoch
  82. IPN triangulation of GRB030606 (two alternate error boxes)
  83. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  84. GRB 030528: tentative NIR counterpart
  85. GRB030528(=H2724): Observations with the Chandra X-ray Observatory
  86. GRB030528, BVRI field photometry
  87. GRB030329, SPM optical observations
  88. GRB030528: Chandra TOO Planned
  89. GRB030528(=H2724): Revised SXC Localization
  90. GRB 030528 Bisei optical observation
  91. GRB030528 (H2724): A long GRB localized by HETE
  92. GRB 030329: Correction to GCN 2254
  93. GRB 030329: Optical Observations
  94. GRB 030528 (=H2724) Kyoto optical observation
  95. GRB 030416: Optical Observations
  96. GRB 030329 Optical Observations
  97. GRB030329: XMM-Newton observation
  98. GRB 021004: HST observations
  99. GRB030324: Further Observations of the Candidate Optical Afterglow
  100. GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum

Advanced

Download all Circulars as a .tar.gz archive:
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