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"

16237 results found.

  1. GRB 220310A: MASTER optical counterpart detection
  2. GRB 220306B: Mondy optical observations, confirmation afterglow candidate
  3. GRB 220306B: AbAO optical observations, possible afterglow candidate
  4. GRB 220306B: BOOTES-1 optical upper limit
  5. ZTF22aabjpxh/AT2022cva (GRB 220219B): continued optical observations, SN signature search
  6. GRB 220302A: Swift/UVOT Upper Limits
  7. Tev Blazar as possible optical counterpart of the high-energy neutrino IceCube-220303A
  8. GRB 220302A: BOOTES-5/JGT optical upper limit
  9. ZTF22aaajecp/AT2022cmc: AMI-LA radio detection
  10. ZTF22aaajecp/AT2022cmc: Mondy optical observations
  11. Konus-Wind observation of GRB 220219B
  12. GRB 220219B: Swift-XRT observations
  13. ZTF22aabjpxh/AT2022cva (GRB 220219B): Mondy optical observations
  14. ZTF22aaajecp/AT2022cmc: Swift Observation and a UV Detection
  15. ZTF22aabjpxh/AT2022cva: 1.5m OSN optical observation
  16. ZTF22aabjpxh/AT2022cva: Assy optical observations
  17. ZTF22aaajecb/AT2022cmc: Submillimeter Array detection
  18. ZTF22aaajecp/AT2022cmc: Terskol observatory optical observations
  19. IPN triangulation of GRB 220219B (consistent with ZTF22aabjpxh/AT2022cva)
  20. IceCube Alert 220220.60:NuEm-220220A: MASTER optical possible counterpart
  21. ZTF22aabjpxh/AT2022cva: ZTF Discovery of a Rapidly Fading Transient with a Likely Long-GRB Counterpart
  22. GRB 220218A: BOOTES-5/JGT optical upper limit
  23. ZTF22aaajecp/AT2022cmc: Keck DEIMOS Redshift
  24. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory continued optical observations
  25. ZTF22aaajecp/AT2022cmc: VLT/X-shooter redshift
  26. GRB 220211A: MASTER optical observations of ZTF22aaajecp/AT2022cmc
  27. ZTF22aaajecp: GIT optical follow-up observations
  28. ZTF22aaajecp/AT2022cmc: Liverpool Telescope photometry
  29. ZTF22aaajecp/AT2022cmc: Zeiss-1000 of Koshka observatory optical observations
  30. ZTF22aaajecp/AT2022cmc: VLA radio detection
  31. ZTF22aaajecp/AT2022cmc: Zwicky Transient Facility discovery of a fast and red optical transient
  32. GRB 220210A: Mondy, AbAO and Terskol optical upper limits
  33. GRB 220210A: 1.5m OSN optical upper limit
  34. GRB 220210A: BOOTES-5/JGT optical afterglow candidate discarded
  35. GRB 220210A: BOOTES-5/JGT optical afterglow candidate
  36. GRB 210919A: Maidanak optical observations
  37. IceCube-211208A: the optical observation of the candidate PKS0735+178
  38. GRB 220117A, GROND observations
  39. GRB 220117A: Terskol and AbAO optical upper limits
  40. GRB 220118A: TARGET optical upper limit
  41. GRB 220117B: TARGET optical upper limit
  42. GRB 220118A: COATLI Optical Observations
  43. GRB 220101A: KAO optical-R observation
  44. GRB 211221A: No V & R detection, KAO telescope
  45. GRB 220118A: NUTTelA-TAO / BSTI Early Optical Limits (Preliminary)
  46. GRB 220118A: GIT optical observations
  47. GRB 220118A: MITSuME Akeno optical observation
  48. GRB 220118A: Swift detection of a burst with an optical counterpart
  49. GRB 220117A: MITSuME Akeno optical upper limits
  50. GRB 220117B: Swift/UVOT Upper Limits
  51. GRB 220117A: Swift/UVOT Upper Limits
  52. GRB 220117A: LCO Optical Observations
  53. GRB 220117A: VLT/X-shooter optical afterglow and redshift
  54. GRB 220117B: Nanshan/NEXT optical upper limit
  55. GRB 220117B: MITSuME Akeno optical upper limits
  56. GRB 220101A: TSHAO optical observation, Terskol, AbAO upper limits
  57. GRB 220117A: Nanshan/NEXT optical observations and a nearby PanSTARRS source
  58. GRB 220101A: The most powerful GRB and BDHN I in 26 years
  59. GRB 220101A: continued 1.3m DFOT optical observations of a high-redshift afterglow
  60. GRB 220107A: SAO RAS optical observations
  61. GRB 220107A: further SAO RAS optical observations
  62. GRB 220101A: Additional Liverpool telescope photometry
  63. GRB 220107A: 6m BTA spectroscopic redshift
  64. GRB 220107A: SAO RAS optical observations
  65. GRB 220101A: SAO RAS optical observations
  66. GRB 220107A: AbAO and Terskol optical observations
  67. GRB 220107B: MITSuME Akeno optical upper limits
  68. GRB 220107B: Nanshan/NEXT optical upper limits and host galaxy candidate
  69. GRB 220107A: Nanshan/NEXT optical observations
  70. GRB 220107A: Swift/UVOT Detection
  71. GRB 220107A: MITSuME Akeno optical observation
  72. GRB 220101A: Tautenburg observations
  73. GRB 220101A: Continued Mondy optical observations
  74. GRB 220101A: continued 1.3m DFOT Optical Observations
  75. GRB 220101A: Mondy optical observations
  76. GRB 220101A: 3rd LCO Optical Observation
  77. GRB 220101A: 2.2m CAHA (+CAFOS) first day optical detection
  78. GRB 220101A: iTelescope optical observations
  79. GRB 211227A: Lijiang 2.4m Telescope Optical Observations
  80. GRB 220101A: VLA detection
  81. GRB 220101A: 1.3m DFOT observations
  82. GRB 220101A: LCO Continued Optical Observations
  83. GRB 211227A: Gemini South Optical Observations
  84. GRB 220101A: TNG NIR afterglow detection
  85. GRB 220101A: ALMA detection
  86. GRB 220101A: LCO Optical Observations
  87. GRB 220101A: Tautenburg observations
  88. GRB 220101A: GMG observation (2nd epoch)
  89. GRB 220101A: OASDG optical observations
  90. GRB 220101A: GMG observation
  91. GRB 220101A: Asiago spectroscopic and photometric detection
  92. GRB220101A: optical afterglow detection from Konkoly Observatory
  93. GRB 220101A: NOT redshift confirmation
  94. GRB 220101A: Liverpool telescope imaging of a high-redshift afterglow
  95. GRB 220101A: THO optical observations
  96. GRB 220101A: Xinglong-2.16m photometry and spectroscopy
  97. GRB 220101A: Swift detection of a burst with a bright optical counterpart
  98. GRB 211229A: Swift-XRT and UVOT observations
  99. GRB 211227A: Swift/UVOT Upper Limits
  100. GRB 211227A: LCO Optical 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