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"

36011 results found.

  1. GRB990123 observations
  2. GRB990123, Optical Observation
  3. GRB 990123: Discovery of the Probable Host Galaxy
  4. GRB 990123: Reduced HST Images
  5. For Immediate Posting to GCN - HST Data GRB 990123 Available
  6. GRB19990123 observations
  7. GRB 990123: BVRI standards in the field
  8. GRB 990123: Updated Keck Spectroscopy Results
  9. GRB981220, field photometry
  10. GRB 990123 NOT Spectrum Update
  11. GRB990123, Optical observation
  12. GRB990123, is the "radio flare" due to an inhomogeneous medium?
  13. GRB 990123: Publicly available reduced HST images
  14. GRB990123, Upcoming HST Service Observations
  15. GRB 990123: New Constraints on Possible Foreground Galaxies
  16. GRB990123 Optical Observations
  17. GRB990123, Probability of gravitational lensing
  18. GRB 990123: Detection of the IR Transient, and the Light Curve Fits
  19. GRB 990123: Continued Radio Observations
  20. GRB990123, Preliminary Lens Search Results
  21. GRB 990123: Correction to GCN 230 - C.A. Young added to author list
  22. On the Lensing Interpretation of GRB 990123
  23. Search for Potential Images of GRB 990123
  24. Search for Potential Images of GRB 990123
  25. GRB990123, Optical BVRI Observations
  26. GRB 990123: near-infrared observations.
  27. GRB990123, OSSE observations
  28. GRB 990123: Strong MeV CGRO-COMPTEL detection now posted on WWW
  29. "GRB 990123: New BV Observations"
  30. GRB 990123 Optical Follow-Up
  31. GRB 990123; Addendum to GCN 223
  32. GRB 990123: BATSE Observations
  33. GRB 990123 Keck Spectrum update
  34. GRB 990123 : Multiple and Distorted Images of the Host Galaxy?
  35. GRB990123 Optical Observations
  36. GRB 990123 Spectroscopic Redshifts
  37. GRB 990123: New Optical Observations, Decay Measure
  38. GRB 990123 Optical Follow-Up
  39. GRB 990123: Possible Gravitationally Lensed Burst?
  40. GRB 990123 optical observations
  41. GRB 990123: Pre-Burst Detection of an Apparent Host Galaxy
  42. GRB 990123 radio observations
  43. GRB 990123, new radio source
  44. GRB990123, Optical observation
  45. GRB 990123: Optical Decay Slope
  46. GRB 990123 r-band photometry
  47. GRB 990123 Optical Follow-up
  48. GRB990123, early optical counterpart detection
  49. GRB990123 Optical Observation
  50. GRB 990123: Bright New Source, Possible Optical Transient
  51. GRB 990123, Radio observations
  52. SN 1999E & GRB 980919
  53. Possible identification of SN1999E with GRB980910
  54. Optical Observations of GRB 981220
  55. GRB 981226: radio variable
  56. GRB981220
  57. GRB981220, Optical Observations
  58. GRB 981220 Optical observations
  59. GRB 981226 Optical Observations
  60. GRB 980613: Spectroscopy of the host galaxy
  61. GRB981226, sub-millimeter observations
  62. GRB981220, sub-millimeter observations
  63. GRB 981220 and GRB 981226, optical observations
  64. GRB 981226 radio observations
  65. GRB 981226
  66. GRB 981226 optical observations
  67. radio observations of GRB 981226
  68. GRB981220 B, R and I band observations
  69. GRB 981220:Optical Observations
  70. GRB 981220 optical R and I observations
  71. GRB981226, BeppoSAX Christmas GRB
  72. GRB 981226 - Infrared Observations
  73. GRB 981226 optical observations
  74. GRB 981220
  75. GRB 981220, radio observations
  76. GRB981226 Optical Observation
  77. GRB 981220, radio observations
  78. GRB 981220: BeppoSAX/GRBM results
  79. GRB981220 I-band Observations
  80. GRB 981220
  81. GRB 981220 Optical Observations
  82. GRB 981220, optical observations
  83. GRB 980326/Host Galaxy
  84. GRB981220 IPN error box
  85. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  86. GRB980329 R,I flux calibration and R,I,K upper limits
  87. GRB980425: X-ray revised positions
  88. GRB 980923 BATSE Observations
  89. GRB980703 Very Long Baseline Interferometry
  90. GRB970508 optical observations
  91. GRB971214, association with a Galactic star?
  92. Optical Observations of the Host Galaxy of GRB 980519
  93. GRB980519, Optical Observations
  94. GRB980703, Host galaxy multicolor photometry
  95. GRB980703 - BeppoSAX/GRBM detection
  96. GRB 980703 (NFI observations)
  97. GRB980703 optical photometry
  98. GRB 980703: BATSE Observations
  99. GRB980703: Radio transient
  100. GRB980703 H-band 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