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"

21952 results found.

  1. Possible GRB 060203: optical observations at Asiago
  2. GRB 060202: PROMPT Observations
  3. GRB 060202: Gemini-N J, H, K_s observations
  4. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  5. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  6. GRB 060202: Refined analysis of the Swift-BAT burst
  7. GRB 060121: Gemini Late-time Observations
  8. Erratum: SDSS pre-burst observations of GRB fields
  9. GRB 060130: PROMPT Observations
  10. GRB 051211A: MDM Observations
  11. GRB 060123: Gemini spectroscopy of the putative host galaxy
  12. GRB 060123: VLA Radio Observations
  13. GRB060130: REM infrared observations
  14. GRB 060130, SMARTS optical observations
  15. GRB 060130: FRAM optical observations
  16. Possible GRB 051221B: MDM Correction
  17. GRB050121: optical observation
  18. GRB 060121: Confirmation of NIR Afterglow
  19. GRB060124: optical observations
  20. GRB 060123: Swift refined analysis of an unusual GRB
  21. GRB060124 optical observations
  22. GRB 060121: Probable Detection of NIR Afterglow
  23. GRB 060116 HST observations
  24. Refined XRT Position for GRB 060123
  25. GRB 060124 Optical Observations
  26. GRB 060124: ART optical limits during the burst
  27. GRB060123: Optical and IR Imaging
  28. GRB 060123: P200 Observations
  29. GRB 060124: Keck optical spectrum
  30. GRB 060124: MDM Optical Spectrum
  31. GRB 060124: R band Observations
  32. GRB060124: optical observations at Asiago
  33. GRB060123: SDSS pre-burst observations
  34. GRB 060124: Optical Observations at Tautenburg
  35. GRB 060116: Radio Detection
  36. GRB 060116: MARGE optical observations
  37. GRB 060121: Liverpool Telescopes optical limits
  38. GRB 060121: Swift XRT refined analysis
  39. GRB 060121: Confirmation of Afterglow
  40. GRB060121: SARA Observations
  41. GRB 060121: optical observations
  42. GRB 060121: Infrared Observations
  43. GRB 060121: optical observations
  44. GRB 060121: Optical imaging
  45. GRB060121 - SDSS pre-burst observations
  46. GRB 060121: A short-hard GRB in a cluster?
  47. GRB 060117: PROMPT Observations
  48. GRB060117 - ATCA 3/6cm radio limits - correction
  49. GRB060117 - ATCA 3/6cm radio limits
  50. GRB 060116: photometric redshift - the farthest GRB?
  51. GRB 060116: possible I-J dropout
  52. GRB 060116: UKIRT IR Observations
  53. GRB 060116: PROMPT Observations
  54. GRB 060117: FRAM optical afterglow candidate
  55. GRB 060117: nearby galaxy
  56. GRB 060117: Swift-BAT detection of a bright burst
  57. GRB 060116: VLT optical observations
  58. GRB 060115: PROMPT Observations
  59. GRB 060116: IR Candidate Afterglow
  60. GRB060115: REM observations
  61. GRB 060116 : Lulin optical limit
  62. GRB060116: Faulkes North observation
  63. GRB 060115: absorption redshift
  64. GRB 060114: REM observations
  65. GRB 060114: Swift/UVOT Observations
  66. GRB 060114: Swift XRT upper limit
  67. GRB060114: Faulkes North observation
  68. GRB 060108: IR observations of afterglow
  69. GRB 060108: Evidence for an XRT Position Offset
  70. GRB 060110: KAIT observations
  71. GRB 060111B: MITSuME detection of optical afterglow
  72. GRB060111A: RTT150 optical observations
  73. GRB060111B: RTT150, possible host galaxy
  74. GRB 060110: MARGE observations
  75. GRB 060111(a): P60 Observations
  76. GRB 060111B: Gualba observatory limit
  77. GRB 060108: VLT K-band observations
  78. GRB 060111: TAROT optical observation
  79. GRB060111 : XRT refined analysis
  80. GRB 060110: Mitsume optical observations
  81. GRB 060110: UKIRT K-band observations
  82. GRB 060110: IR Candidate Afterglow
  83. GRB 060110: Super-LOTIS observations
  84. GRB 060110: Correction
  85. GRB 050110: IR Observations
  86. GRB 060108: ISAS early observations and near IR upper limit
  87. GRB060108: P200 Ks Observations
  88. GRB 060108: early UKIRT K-band observations
  89. GRB 060108: a dark burst?
  90. GRB 060108: VLT J-band observations
  91. GRB 060108: Mitsume optical observations
  92. GRB060108: SDSS pre-burst observations
  93. GRB060108: Faulkes Telescope observation
  94. GRB 060105: Radio observations
  95. GRB 060105: ISAS observations and near IR upper limit
  96. GRB 060105: Mitsume optical observations
  97. GRB 060102 - no XRT afterglow
  98. GRB051211B: optical observations
  99. GRB051227: SARA Observations
  100. GRB 051221B: Optical Observations with Kuiper 1.54m

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