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"

14323 results found.

  1. GRB040624: optical monitoring at TNG
  2. XRF040701: VLA Observations
  3. GRB 030324: Detection and Color of Host Galaxy
  4. GRB040511: Redshift identifcation
  5. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  6. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  7. INTEGRAL detection of activity from SGR1806-20
  8. GRB 040223 : Optical observation (non-detection)
  9. GRB040106, likely optical afterglow
  10. GRB031203: K' Photometry of the likely GRB host
  11. GRB 031203: Radio detection
  12. GRB 031203: IR NTTobservations do not confirm REM detection
  13. IPN detection of activity from SGR1806-20
  14. SGR1806-20 bursts on 031008. Helicon detection and small error box.
  15. IPN detection of continued activity from SGR1806-20
  16. XRF 030723: Subaru Optical Observations
  17. XRF 030723: Detection of the likely host galaxy
  18. GRB 030913, optical candidate
  19. XRF 020427: Gemini-South Spectroscopic Observations of the Host
  20. IBAS detection of bursts from SGR 1806-20
  21. GRB 030824: Candidate Afterglow (or Variable/Flare Star?)
  22. IPN detection of continued activity from SGR1806-20
  23. XRF 030723: Detection of a rebrightening in the optical afterglow
  24. XRF030723: Re-analysis of ROTSE-III early images
  25. GRB 030725: optical observations.
  26. GRB030725, optical transient observations
  27. XRF030723 Radio Observations
  28. GRB030725, possible optical transient
  29. XRF030723: Palomar observations and proposed counterpart
  30. XRF 030723, optical observations
  31. Konus-Wind detection of the bursts from SGR1806-20 region
  32. IPN detection of renewed activity from SGR1806-20
  33. IPN triangulation of GRB030711 (annulus, =SGR0525-66?)
  34. HETE detection of burst from SGR1806-20
  35. GRB 021206, Radio afterglow candidate
  36. GRB 030528: Infrared Observations and the Proposed IR Counterpart
  37. GRB030501 localized by INTEGRAL
  38. GRB030329 observed as a sudden ionospheric disturbance (SID)
  39. SNeIa AS THE POSSIBLE PROGENITORS OF SHORT-DURATION GRBs.
  40. OT GRB 030329: early spectrum
  41. GRB 030329 VLBA Observations
  42. GRB 030329: Sub-millimeter detection
  43. GRB 030329: Radio observations at GMRT
  44. GRB030329a: detection by Konus-Wind
  45. GRB030329b: detection by Konus-Wind and Helicon-CoronasF
  46. GRB 030329, optical spectroscopy
  47. GRB 030329: visual observations
  48. RXTE detection of GRB 030329 afterglow
  49. Possible GRB030323 localized by INTEGRAL
  50. GRB030323: Detection on 2003/03/24
  51. VLT/FORS2 spectra of GRB 030323
  52. GRB030323, ROTSE-III detection of possible optical counterpart
  53. Possible GRB 030320 localized by INTEGRAL
  54. GRB030226: Analysis of Chandra data
  55. Chandra detection of the X-ray afterglow of GRB 030226
  56. GRB 030228, optical observations
  57. GRB030227 localized by INTEGRAL
  58. GRB030226 (=U10893): A Long GRB Localized by the HETE WXM and SXC
  59. GRB 030217: Optical Observations at 4, 5, and 6 Days
  60. GRB030115, WSRT radio observations - correction to GCN 1864
  61. GRB 030131: marginal optical detection
  62. GRB030115, WSRT radio observations
  63. A long GRB detected by INTEGRAL
  64. GRB 030115: Radio detection of IR candidate
  65. GRB 030115: IR observations with IRSF/SIRIUS
  66. GRB030115: R-band counterpart of IR candidate
  67. GRB030115: TAROT optical observations
  68. GRB 030115, optical candidate
  69. GRB 021112: Evidence for Another Dark Optical Afterglow
  70. GRB021219: a long GRB localized by INTEGRAL
  71. IPN detection of continued activity from SGR1806-20
  72. GRB 021211, optical observations
  73. GRB021211: Measurement of Early Time Afterglow
  74. IPN detection of renewed activity from SGR1806-20
  75. IPN detection of continued SGR1900+14 activity
  76. GRB021125 : A long GRB localized by INTEGRAL
  77. IPN detection of possible reactivation of SGR1900+14
  78. GRB 021113: Evidence for a Dark Optical Afterglow
  79. Detection of activity from SGR 1900+14 with the RXTE/PCA
  80. GRB 020813; likely host galaxy.
  81. GRB 021008, optical observations
  82. GRB 021004: optical spectroscopy on Oct 11
  83. GRB021004: optical observation
  84. GRB 021004: WC wind?
  85. GRB 021004: Optical observations, AUDE network
  86. GRB 021004: optical spectroscopy
  87. IRAM Millimeter detection of GRB 021004
  88. GRB 021004 radio search
  89. XRF 020903: optical observation at Kyoto
  90. GRB020322 : HST/STIS observations
  91. IPN detection of a burst from SGR1900+14
  92. XRF 020903, optical observations
  93. Confirming no variability for GRB02081
  94. GRB020813: Early Time Magnitude
  95. GRB 020813, radio detection
  96. GRB020812: optical observations
  97. GRB 020813 multiband optical observations
  98. HST Imaging of the Host of GRB 011121
  99. GRB 020410: Discovery of Probable OT by HST
  100. GRB 020625, optical observations

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