Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. 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"

20470 results found.

  1. GRB 070224: SARA upper limit
  2. GRB 070224: optical afterglow candidate
  3. GRB 070224: MASTER-Net refind analysis
  4. GRB 070224: MASTER-VWF-Kislovodsk observations
  5. GRB 070224: Swift detection of a burst
  6. GRB 070223: Optical observations
  7. RHESSI Spectrum of GRB070220
  8. GRB070223: Swift/UVOT refined analysis
  9. GRB 070223: Optical-IR observation with KANATA
  10. GRB070223: MASTER-VWF-Kislovodsk observations
  11. GRB070223 - SDSS Pre-Burst Observations
  12. GRB070223: Swift burst
  13. Konus-Wind and Konus-A observations of GRB 070220
  14. GRB 070220: MITSuME Okayama Optical Observation
  15. GRB 070220 Swift-BAT Refined Analysis
  16. Swift/UVOT refined analysis of GRB070220
  17. GRB 070209: Swift XRT refined analysis
  18. GRB 070220: Observation with the KANATA 1.5m telescope
  19. GRB 070219: Gemini Observations
  20. GRB 070220: Swift detection of a burst
  21. GRB070219: MASTER-VWF-Kislovodsk observations
  22. GRB 070219: Swift/UVOT Upper limits
  23. GRB 070219: I-band observations
  24. GRB 070219: optical TNG observations
  25. GRB 070219: ROTSE-III Optical Limits
  26. GRB070219 - SDSS Pre-Burst Observations
  27. GRB 070219: Swift detection of a burst
  28. GRB 070125 observations with the GMRT
  29. GRB 070129: MDM I-band Detection
  30. GRB 070209: Swift XRT analysis
  31. GRB 070201: clarification on localization and Konus-Wind spectra
  32. IPN localization of very intense short GRB 070201
  33. GRB 070208: RAPTOR detection of early afterglow onset
  34. GRB 070208, Swift-BAT refined analysis
  35. GRB070208 - SDSS Pre-Burst Observations
  36. GRB 070208: Afterglow confirmation from P60
  37. GRB 070208: ROTSE-III Optical Limits
  38. GRB 070208: Swift detection of a burst
  39. GRB 070125 detection with CARMA
  40. GRB 070129: afterglow confirmation
  41. GRB070124: Swift-XRT Follow-up Observation
  42. GRB070126: Swift-XRT Observation
  43. GRB 070125: further AAVSO optical observations
  44. GRB 070129: Swift/UVOT Upper limits
  45. GRB 070129: Xinglong TNT optical Upper Limit
  46. GRB 070129: Swift-XRT Refined Analysis
  47. GRB 070129: VLT observations
  48. GRB 070125: An IR Point Source and an Apparent Host Galaxy
  49. GRB 070129: Swift detection of a burst
  50. GRB 070126: Swift/UVOT refined analysis
  51. Konus-Wind observation of GRB 070125
  52. GRB 070125: optical observations
  53. GRB 070126: VLT observations
  54. GRB 070124: Suzaku WAM observation of the prompt emissions
  55. GRB 070126, Swift-BAT refined analysis of a very faint burst
  56. GRB070125: Optical observation by Kanata
  57. GRB070124: Swift-XRT Observation
  58. Possible GRB 070126: Swift/UVOT Upper Limit
  59. GRB 070125: UVOT Observations of a Fading Optical Afterglow
  60. GRB 070125: Xinglong TNT optical observations
  61. GRB070125: Swift-XRT Refined Analysis
  62. GRB 070125: SARA detection in R
  63. GRB 070125: P60 Optical Afterglow Candidate
  64. GRB 070126?: Swift detection of a possible burst
  65. GRB070125 redshift request
  66. RHESSI Spectrum of GRB070125
  67. Konus-Wind observation of short hard GRB 070124
  68. IPN localization of GRB070124 (short duration, hard spectrum)
  69. GRB 070110: optical break
  70. GRB 070107: Suzaku WAM observation of the prompt emission
  71. GRB 070110, Swift-BAT refined analysis
  72. GRB070107 Swift/UVOT Observations of a Fading Optical Afterglow
  73. GRB 070110: Swift detection of a burst with a possible optical afterglow
  74. GRB 070107: Swift detection of a burst
  75. VLA observation of GRB 061222B
  76. VLA detection of GRB 061222A
  77. GRB070103: APO SPIcam i' and z' limits
  78. GRB070103: KPNO 4m+FLAMINGOS J limit
  79. GRB 070103: Swift/UVOT Upper limits
  80. GRB 070103: NOT observations
  81. GRB 070103: TAROT Calern observatory optical observations
  82. erratum : SDSS Pre-burst Observations of GRB061126
  83. Konus-Wind observation of GRB 061222A
  84. GRB 061210: Swift/XRT Astrometry Correction
  85. GRB 061222A: Confirmation of Gemini Afterglow Candidate
  86. GRB 061222A: Xinglong Optical Limit
  87. GRB 061222A: Gemini Afterglow Candidate
  88. GRB 061222B, Swift-BAT refined analysis
  89. GRB061222A Swift/UVOT: Upper Limits
  90. GRB 061222B: Swift/UVOT Upper limits
  91. GRB 061222B: Observation with the KANATA 1.5m telescope
  92. GRB 061222A: Observation with the KANATA 1.5m telescope
  93. GRB 061222B: BOOTES-IR optical observations
  94. GRB 061222B: SARA upper limit
  95. GRB 061222B: REM NIR/optical observations
  96. GRB 061222B: TAROT La Silla observatory optical observations
  97. GRB 061222B: Swift detection of a burst
  98. GRB 061222A: Prompt ROTSE-III Optical Limits
  99. GRB 061222: Swift detection of a burst
  100. GRB 061218: TAROT La Silla observatory 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