Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! 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"

16161 results found.

  1. GRB 120803A: MITSuME Okayama Optical upper limits
  2. GRB 120803B: MITSuME Akeno Optical upper limits
  3. GRB 120802A: GRT Optical Observation
  4. GRB 120802A: MASTER optical observations
  5. GRB 120802A: optical uper limit in ISON-NM observatory
  6. GRB 120729A: break in the optical light curve
  7. GRB 120729A: Optical observations from OSN, BOOTES1/2 and IAC80
  8. GRB 120729A: RTT150 optical observations
  9. GRB 120729A: EVLA Observations
  10. GRB 120729A: Early RAPTOR Observations
  11. T100 observations of GRB 120729A
  12. GRB 120728A: GROND Afterglow discovery
  13. GRB 120729A: Swift/UVOT Detection
  14. GRB 120729A: Xinglong TNT optical upper limit
  15. GRB 120728A: Swift/UVOT Upper Limits
  16. GRB120729A - Faulkes Telescope North Optical Afterglow Candidate
  17. GRB 120729A: Swift detection of a burst with an optical afterglow
  18. GRB 120728A: GROND observations
  19. GRB 120716A: optical observation in Maidanak observatory
  20. GRB 120722A: optical upper limit
  21. GRB 120724A: optical observation in Maidanak observatory
  22. GRB 120716A: optical observation in CrAO
  23. GRB 120724A: Swift/UVOT Detection of the Optical Afterglow
  24. GRB 120724A: FTN optical afterglow candidate
  25. GRB 120722A: Swift/UVOT Upper Limits
  26. GRB 120722A: VLT/X-shooter redshift of the host galaxy
  27. GRB 120722A: Correction for GCN circ.13500
  28. GRB 120722A: Xinglong TNT optical afterglow candidate
  29. GRB 120716A: EVLA Detection
  30. GRB 120716A: Swift-XRT detection
  31. GRB 120716A: Swift/XRT position consistent with that of the optical counterpart
  32. GRB 120716A: Redshift confirmation from VLT/X-shooter
  33. GRB 120716A: GROND confirmation of the optical/NIR afterglow
  34. GRB 120716A: Optical decay from NOT
  35. GRB 120716A: Candidate Optical Afterglow from PTF
  36. GRB120714A: Swift/UVOT upper limits
  37. GRB 120714A: GROND upper limits
  38. GRB 120714B: GROND confirmation of fading afterglow
  39. GRB 120714B: Position Correction and Candidate Optical Afterglow
  40. GRB120711B: MITSuME Ishigakijima upper limits
  41. GRB 120712A: Swift/UVOT Detection
  42. GRB 120712A: GROND Detection of the Optical/NIR Afterglow Candidate and photo-z
  43. GRB 120712A: Swift detection of a burst with optical afterglow
  44. GRB 120711B: Swift/UVOT Upper Limits
  45. GRB 120711A: Swift/UVOT Observations
  46. GRB 120709A: Swift/UVOT Observations
  47. GRB 120711A: REM NIR early time detection
  48. GRB 120711A: an bright long GRB detected with INTEGRAL
  49. Continued Skynet/PROMPT observations of GRB120711A
  50. GRB 120711A: ROTSE-III confirm of Optical Counterpart
  51. GRB 120709A: optical afterglow limits
  52. GRB 120703A: SMARTS optical/IR observations
  53. GRB 120703A: NOT optical observation
  54. GRB 120703A: Swift detection of a bright burst with an optical afterglow
  55. GRB 120630A: Swift-BAT/-XRT/-UVOT refined analysis
  56. GRB 120630A: NOT optical source within the XRT error circle
  57. GRB 120624B: Swift/UVOT Upper Limits
  58. GRB 120624B: GROND upper limits
  59. Skynet/PROMPT observations of IGR J17062-6143 (Swift trigger 525148)
  60. GRB 120624B: NOT optical upper limit
  61. GRB 120624B: optical observations
  62. Swift trigger 524642 / SwJ1910.2-0546
  63. GRB 120612A: optical observations
  64. GRB 120612A: Swift/UVOT observations
  65. GRB 120612A: BOOTES-3 optical upper limit
  66. GRB 120521C redshift estimate
  67. GRB120521B: SSO 2.3m upper limits
  68. GRB 120521A: GROND Upper limits
  69. GRB 120521C: Swift/UVOT Upper Limits
  70. GRB 120521B: Swift/UVOT Upper Limits
  71. GRB 120521C: MASTER optical limit
  72. GRB 120521B: GROND Upper limits
  73. GRB 120521C: BOOTES-1 optical observations
  74. GRB 120521C: WHT optical observations
  75. GRB 120521C - NOT optical limits
  76. GRB 120521C: TAROT Calern observatory optical observations
  77. GRB 120521A: Swift/UVOT Upper Limits
  78. GRB 120521B/Fermi Trigger 359284074: early MASTER-ICATE optical limit
  79. GRB 120521B: TAROT La Silla observatory optical observations
  80. GRB 120521A: TAROT La Silla observatory optical observations
  81. GRB 120514A: Swift/UVOT Upper Limits
  82. GRB 120514A: TAROT Calern observatory optical observations
  83. GRB 120422A: Konkoly optical observations
  84. Fermi Trigger 358364818: BOOTES-4 observations
  85. GRB 120510B/Fermi Trigger 358364818: MASTER possible OT candidate
  86. GRB 120510A: MASTER follow up observations
  87. GRB 120422A: SN identification from GTC
  88. GRB 120422A: P200 NIR detection
  89. GRB 120422A: CARMA 3mm observations
  90. GRB 120422A: VLT/X-shooter spectroscopic evidence for a SN
  91. GRB 120422A: i-band re-brightening and possible SN detection
  92. GRB 120427A: MASTER follow up observations
  93. GRB 120422A: optical observations
  94. GRB 120422A: Additional Gemini observations and Keck/LRIS spectroscopy
  95. GRB 120422A: MITSuME Ishigakijima upper limit
  96. GRB 120422A: 272 GHz observations from SMA
  97. GRB 120422A: RAPTOR Limits During Gamma-ray Emitting Interval
  98. GRB 120422A: VLT/X-shooter spectroscopy of the GRB counterpart
  99. GRB 120422A GROND observations
  100. GRB 120422A: Xinglong TNT optical upper limit

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